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提交 b70d7a4a 编写于 作者: A Anton Khirnov
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lavc: add a native Opus decoder. 

Initial implementation by Andrew D'Addesio <modchipv12@gmail.com> during
GSoC 2012.

Completion by Anton Khirnov <anton@khirnov.net>, sponsored by the
Mozilla Corporation.

Further contributions by:
Christophe Gisquet <christophe.gisquet@gmail.com>
Janne Grunau <janne-libav@jannau.net>
Luca Barbato <lu_zero@gentoo.org>
上级 7e90133f
隐藏空白更改
内联 并排
Showing with 5743 addition and 2 deletion
Changelog
浏览文件 @ b70d7a4a
......@@ -25,6 +25,7 @@ version <next>:
- On2 AVC (Audio for Video) decoder
- support for decoding through DXVA2 in avconv
- libbs2b-based stereo-to-binaural audio filter
- native Opus decoder
version 10:
......
configure
浏览文件 @ b70d7a4a
......@@ -1822,6 +1822,7 @@ nellymoser_decoder_select="mdct sinewin"
nellymoser_encoder_select="audio_frame_queue mdct sinewin"
nuv_decoder_select="dsputil lzo"
on2avc_decoder_select="mdct"
opus_decoder_deps="avresample"
png_decoder_deps="zlib"
png_encoder_deps="zlib"
png_encoder_select="dsputil"
......@@ -4387,6 +4388,8 @@ enabled movie_filter && prepend avfilter_deps "avformat avcodec"
enabled resample_filter && prepend avfilter_deps "avresample"
enabled scale_filter && prepend avfilter_deps "swscale"
enabled opus_decoder && prepend avcodec_deps "avresample"
expand_deps(){
lib_deps=${1}_deps
eval "deps=\$$lib_deps"
......
libavcodec/Makefile
浏览文件 @ b70d7a4a
......@@ -279,6 +279,9 @@ OBJS-$(CONFIG_NELLYMOSER_DECODER) += nellymoserdec.o nellymoser.o
OBJS-$(CONFIG_NELLYMOSER_ENCODER) += nellymoserenc.o nellymoser.o
OBJS-$(CONFIG_NUV_DECODER) += nuv.o rtjpeg.o
OBJS-$(CONFIG_ON2AVC_DECODER) += on2avc.o on2avcdata.o
OBJS-$(CONFIG_OPUS_DECODER) += opusdec.o opus.o opus_celt.o \
opus_imdct.o opus_silk.o \
vorbis_data.o
OBJS-$(CONFIG_PAF_VIDEO_DECODER) += paf.o
OBJS-$(CONFIG_PAF_AUDIO_DECODER) += paf.o
OBJS-$(CONFIG_PAM_DECODER) += pnmdec.o pnm.o
......@@ -653,6 +656,7 @@ OBJS-$(CONFIG_MPEGAUDIO_PARSER) += mpegaudio_parser.o \
mpegaudiodecheader.o mpegaudiodata.o
OBJS-$(CONFIG_MPEGVIDEO_PARSER) += mpegvideo_parser.o \
mpeg12.o mpeg12data.o
OBJS-$(CONFIG_OPUS_PARSER) += opus_parser.o opus.o vorbis_data.o
OBJS-$(CONFIG_PNG_PARSER) += png_parser.o
OBJS-$(CONFIG_PNM_PARSER) += pnm_parser.o pnm.o
OBJS-$(CONFIG_RV30_PARSER) += rv34_parser.o
......
libavcodec/allcodecs.c
浏览文件 @ b70d7a4a
......@@ -331,6 +331,7 @@ void avcodec_register_all(void)
REGISTER_DECODER(MPC8, mpc8);
REGISTER_ENCDEC (NELLYMOSER, nellymoser);
REGISTER_DECODER(ON2AVC, on2avc);
REGISTER_DECODER(OPUS, opus);
REGISTER_DECODER(PAF_AUDIO, paf_audio);
REGISTER_DECODER(QCELP, qcelp);
REGISTER_DECODER(QDM2, qdm2);
......@@ -483,6 +484,7 @@ void avcodec_register_all(void)
REGISTER_PARSER(MPEG4VIDEO, mpeg4video);
REGISTER_PARSER(MPEGAUDIO, mpegaudio);
REGISTER_PARSER(MPEGVIDEO, mpegvideo);
REGISTER_PARSER(OPUS, opus);
REGISTER_PARSER(PNG, png);
REGISTER_PARSER(PNM, pnm);
REGISTER_PARSER(RV30, rv30);
......
libavcodec/opus.c 0 → 100644
浏览文件 @ b70d7a4a
/*
* Copyright (c) 2012 Andrew D'Addesio
* Copyright (c) 2013-2014 Mozilla Corporation
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Opus decoder/parser shared code
*/
#include <stdint.h>
#include "libavutil/error.h"
#include "opus.h"
#include "vorbis.h"
static const uint16_t opus_frame_duration[32] = {
480, 960, 1920, 2880,
480, 960, 1920, 2880,
480, 960, 1920, 2880,
480, 960,
480, 960,
120, 240, 480, 960,
120, 240, 480, 960,
120, 240, 480, 960,
120, 240, 480, 960,
};
/**
* Read a 1- or 2-byte frame length
*/
static inline int xiph_lacing_16bit(const uint8_t **ptr, const uint8_t *end)
{
int val;
if (*ptr >= end)
return AVERROR_INVALIDDATA;
val = *(*ptr)++;
if (val >= 252) {
if (*ptr >= end)
return AVERROR_INVALIDDATA;
val += 4 * *(*ptr)++;
}
return val;
}
/**
* Read a multi-byte length (used for code 3 packet padding size)
*/
static inline int xiph_lacing_full(const uint8_t **ptr, const uint8_t *end)
{
int val = 0;
int next;
while (1) {
if (*ptr >= end || val > INT_MAX - 254)
return AVERROR_INVALIDDATA;
next = *(*ptr)++;
val += next;
if (next < 255)
break;
else
val--;
}
return val;
}
/**
* Parse Opus packet info from raw packet data
*/
int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size,
int self_delimiting)
{
const uint8_t *ptr = buf;
const uint8_t *end = buf + buf_size;
int padding = 0;
int frame_bytes, i;
if (buf_size < 1)
goto fail;
/* TOC byte */
i = *ptr++;
pkt->code = (i ) & 0x3;
pkt->stereo = (i >> 2) & 0x1;
pkt->config = (i >> 3) & 0x1F;
/* code 2 and code 3 packets have at least 1 byte after the TOC */
if (pkt->code >= 2 && buf_size < 2)
goto fail;
switch (pkt->code) {
case 0:
/* 1 frame */
pkt->frame_count = 1;
pkt->vbr = 0;
if (self_delimiting) {
int len = xiph_lacing_16bit(&ptr, end);
if (len < 0 || len > end - ptr)
goto fail;
end = ptr + len;
buf_size = end - buf;
}
frame_bytes = end - ptr;
if (frame_bytes > MAX_FRAME_SIZE)
goto fail;
pkt->frame_offset[0] = ptr - buf;
pkt->frame_size[0] = frame_bytes;
break;
case 1:
/* 2 frames, equal size */
pkt->frame_count = 2;
pkt->vbr = 0;
if (self_delimiting) {
int len = xiph_lacing_16bit(&ptr, end);
if (len < 0 || 2 * len > end - ptr)
goto fail;
end = ptr + 2 * len;
buf_size = end - buf;
}
frame_bytes = end - ptr;
if (frame_bytes & 1 || frame_bytes >> 1 > MAX_FRAME_SIZE)
goto fail;
pkt->frame_offset[0] = ptr - buf;
pkt->frame_size[0] = frame_bytes >> 1;
pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
pkt->frame_size[1] = frame_bytes >> 1;
break;
case 2:
/* 2 frames, different sizes */
pkt->frame_count = 2;
pkt->vbr = 1;
/* read 1st frame size */
frame_bytes = xiph_lacing_16bit(&ptr, end);
if (frame_bytes < 0)
goto fail;
if (self_delimiting) {
int len = xiph_lacing_16bit(&ptr, end);
if (len < 0 || len + frame_bytes > end - ptr)
goto fail;
end = ptr + frame_bytes + len;
buf_size = end - buf;
}
pkt->frame_offset[0] = ptr - buf;
pkt->frame_size[0] = frame_bytes;
/* calculate 2nd frame size */
frame_bytes = end - ptr - pkt->frame_size[0];
if (frame_bytes < 0 || frame_bytes > MAX_FRAME_SIZE)
goto fail;
pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
pkt->frame_size[1] = frame_bytes;
break;
case 3:
/* 1 to 48 frames, can be different sizes */
i = *ptr++;
pkt->frame_count = (i ) & 0x3F;
padding = (i >> 6) & 0x01;
pkt->vbr = (i >> 7) & 0x01;
if (pkt->frame_count == 0 || pkt->frame_count > MAX_FRAMES)
goto fail;
/* read padding size */
if (padding) {
padding = xiph_lacing_full(&ptr, end);
if (padding < 0)
goto fail;
}
/* read frame sizes */
if (pkt->vbr) {
/* for VBR, all frames except the final one have their size coded
in the bitstream. the last frame size is implicit. */
int total_bytes = 0;
for (i = 0; i < pkt->frame_count - 1; i++) {
frame_bytes = xiph_lacing_16bit(&ptr, end);
if (frame_bytes < 0)
goto fail;
pkt->frame_size[i] = frame_bytes;
total_bytes += frame_bytes;
}
if (self_delimiting) {
int len = xiph_lacing_16bit(&ptr, end);
if (len < 0 || len + total_bytes + padding > end - ptr)
goto fail;
end = ptr + total_bytes + len + padding;
buf_size = end - buf;
}
frame_bytes = end - ptr - padding;
if (total_bytes > frame_bytes)
goto fail;
pkt->frame_offset[0] = ptr - buf;
for (i = 1; i < pkt->frame_count; i++)
pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
pkt->frame_size[pkt->frame_count-1] = frame_bytes - total_bytes;
} else {
/* for CBR, the remaining packet bytes are divided evenly between
the frames */
if (self_delimiting) {
frame_bytes = xiph_lacing_16bit(&ptr, end);
if (frame_bytes < 0 || pkt->frame_count * frame_bytes + padding > end - ptr)
goto fail;
end = ptr + pkt->frame_count * frame_bytes + padding;
buf_size = end - buf;
} else {
frame_bytes = end - ptr - padding;
if (frame_bytes % pkt->frame_count ||
frame_bytes / pkt->frame_count > MAX_FRAME_SIZE)
goto fail;
frame_bytes /= pkt->frame_count;
}
pkt->frame_offset[0] = ptr - buf;
pkt->frame_size[0] = frame_bytes;
for (i = 1; i < pkt->frame_count; i++) {
pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
pkt->frame_size[i] = frame_bytes;
}
}
}
pkt->packet_size = buf_size;
pkt->data_size = pkt->packet_size - padding;
/* total packet duration cannot be larger than 120ms */
pkt->frame_duration = opus_frame_duration[pkt->config];
if (pkt->frame_duration * pkt->frame_count > MAX_PACKET_DUR)
goto fail;
/* set mode and bandwidth */
if (pkt->config < 12) {
pkt->mode = OPUS_MODE_SILK;
pkt->bandwidth = pkt->config >> 2;
} else if (pkt->config < 16) {
pkt->mode = OPUS_MODE_HYBRID;
pkt->bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND + (pkt->config >= 14);
} else {
pkt->mode = OPUS_MODE_CELT;
pkt->bandwidth = (pkt->config - 16) >> 2;
/* skip mediumband */
if (pkt->bandwidth)
pkt->bandwidth++;
}
return 0;
fail:
memset(pkt, 0, sizeof(*pkt));
return AVERROR_INVALIDDATA;
}
static int channel_reorder_vorbis(int nb_channels, int channel_idx)
{
return ff_vorbis_channel_layout_offsets[nb_channels - 1][channel_idx];
}
static int channel_reorder_unknown(int nb_channels, int channel_idx)
{
return channel_idx;
}
av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
OpusContext *s)
{
static const uint8_t default_channel_map[2] = { 0, 1 };
uint8_t default_extradata[19] = {
'O', 'p', 'u', 's', 'H', 'e', 'a', 'd',
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
int (*channel_reorder)(int, int) = channel_reorder_unknown;
const uint8_t *extradata, *channel_map;
int extradata_size;
int version, channels, map_type, streams, stereo_streams, i, j;
uint64_t layout;
if (!avctx->extradata) {
if (avctx->channels > 2) {
av_log(avctx, AV_LOG_ERROR,
"Multichannel configuration without extradata.\n");
return AVERROR(EINVAL);
}
default_extradata[9] = (avctx->channels == 1) ? 1 : 2;
extradata = default_extradata;
extradata_size = sizeof(default_extradata);
} else {
extradata = avctx->extradata;
extradata_size = avctx->extradata_size;
}
if (extradata_size < 19) {
av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
extradata_size);
return AVERROR_INVALIDDATA;
}
version = extradata[8];
if (version > 15) {
avpriv_request_sample(avctx, "Extradata version %d", version);
return AVERROR_PATCHWELCOME;
}
avctx->delay = AV_RL16(extradata + 10);
channels = extradata[9];
if (!channels) {
av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extadata\n");
return AVERROR_INVALIDDATA;
}
s->gain_i = AV_RL16(extradata + 16);
if (s->gain_i)
s->gain = pow(10, s->gain_i / (20.0 * 256));
map_type = extradata[18];
if (!map_type) {
if (channels > 2) {
av_log(avctx, AV_LOG_ERROR,
"Channel mapping 0 is only specified for up to 2 channels\n");
return AVERROR_INVALIDDATA;
}
layout = (channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
streams = 1;
stereo_streams = channels - 1;
channel_map = default_channel_map;
} else if (map_type == 1 || map_type == 255) {
if (extradata_size < 21 + channels) {
av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
extradata_size);
return AVERROR_INVALIDDATA;
}
streams = extradata[19];
stereo_streams = extradata[20];
if (!streams || stereo_streams > streams ||
streams + stereo_streams > 255) {
av_log(avctx, AV_LOG_ERROR,
"Invalid stream/stereo stream count: %d/%d\n", streams, stereo_streams);
return AVERROR_INVALIDDATA;
}
if (map_type == 1) {
if (channels > 8) {
av_log(avctx, AV_LOG_ERROR,
"Channel mapping 1 is only specified for up to 8 channels\n");
return AVERROR_INVALIDDATA;
}
layout = ff_vorbis_channel_layouts[channels - 1];
channel_reorder = channel_reorder_vorbis;
} else
layout = 0;
channel_map = extradata + 21;
} else {
avpriv_request_sample(avctx, "Mapping type %d", map_type);
return AVERROR_PATCHWELCOME;
}
s->channel_maps = av_mallocz_array(channels, sizeof(*s->channel_maps));
if (!s->channel_maps)
return AVERROR(ENOMEM);
for (i = 0; i < channels; i++) {
ChannelMap *map = &s->channel_maps[i];
uint8_t idx = channel_map[channel_reorder(channels, i)];
if (idx == 255) {
map->silence = 1;
continue;
} else if (idx >= streams + stereo_streams) {
av_log(avctx, AV_LOG_ERROR,
"Invalid channel map for output channel %d: %d\n", i, idx);
return AVERROR_INVALIDDATA;
}
/* check that we din't see this index yet */
map->copy = 0;
for (j = 0; j < i; j++)
if (channel_map[channel_reorder(channels, j)] == idx) {
map->copy = 1;
map->copy_idx = j;
break;
}
if (idx < 2 * stereo_streams) {
map->stream_idx = idx / 2;
map->channel_idx = idx & 1;
} else {
map->stream_idx = idx - stereo_streams;
map->channel_idx = 0;
}
}
avctx->channels = channels;
avctx->channel_layout = layout;
s->nb_streams = streams;
s->nb_stereo_streams = stereo_streams;
return 0;
}
libavcodec/opus.h 0 → 100644
浏览文件 @ b70d7a4a
/*
* Opus decoder/demuxer common functions
* Copyright (c) 2012 Andrew D'Addesio
* Copyright (c) 2013-2014 Mozilla Corporation
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_OPUS_H
#define AVCODEC_OPUS_H
#include <stdint.h>
#include "libavutil/audio_fifo.h"
#include "libavutil/float_dsp.h"
#include "libavutil/frame.h"
#include "libavresample/avresample.h"
#include "avcodec.h"
#include "get_bits.h"
#define MAX_FRAME_SIZE 1275
#define MAX_FRAMES 48
#define MAX_PACKET_DUR 5760
#define CELT_SHORT_BLOCKSIZE 120
#define CELT_OVERLAP CELT_SHORT_BLOCKSIZE
#define CELT_MAX_LOG_BLOCKS 3
#define CELT_MAX_FRAME_SIZE (CELT_SHORT_BLOCKSIZE * (1 << CELT_MAX_LOG_BLOCKS))
#define CELT_MAX_BANDS 21
#define CELT_VECTORS 11
#define CELT_ALLOC_STEPS 6
#define CELT_FINE_OFFSET 21
#define CELT_MAX_FINE_BITS 8
#define CELT_NORM_SCALE 16384
#define CELT_QTHETA_OFFSET 4
#define CELT_QTHETA_OFFSET_TWOPHASE 16
#define CELT_DEEMPH_COEFF 0.85000610f
#define CELT_POSTFILTER_MINPERIOD 15
#define CELT_ENERGY_SILENCE (-28.0f)
#define SILK_HISTORY 322
#define SILK_MAX_LPC 16
#define ROUND_MULL(a,b,s) (((MUL64(a, b) >> (s - 1)) + 1) >> 1)
#define ROUND_MUL16(a,b) ((MUL16(a, b) + 16384) >> 15)
#define opus_ilog(i) (av_log2(i) + !!(i))
enum OpusMode {
OPUS_MODE_SILK,
OPUS_MODE_HYBRID,
OPUS_MODE_CELT
};
enum OpusBandwidth {
OPUS_BANDWIDTH_NARROWBAND,
OPUS_BANDWIDTH_MEDIUMBAND,
OPUS_BANDWIDTH_WIDEBAND,
OPUS_BANDWIDTH_SUPERWIDEBAND,
OPUS_BANDWIDTH_FULLBAND
};
typedef struct RawBitsContext {
const uint8_t *position;
unsigned int bytes;
unsigned int cachelen;
unsigned int cacheval;
} RawBitsContext;
typedef struct OpusRangeCoder {
GetBitContext gb;
RawBitsContext rb;
unsigned int range;
unsigned int value;
unsigned int total_read_bits;
} OpusRangeCoder;
typedef struct SilkContext SilkContext;
typedef struct CeltIMDCTContext CeltIMDCTContext;
typedef struct CeltContext CeltContext;
typedef struct OpusPacket {
int packet_size; /** packet size */
int data_size; /** size of the useful data -- packet size - padding */
int code; /** packet code: specifies the frame layout */
int stereo; /** whether this packet is mono or stereo */
int vbr; /** vbr flag */
int config; /** configuration: tells the audio mode,
** bandwidth, and frame duration */
int frame_count; /** frame count */
int frame_offset[MAX_FRAMES]; /** frame offsets */
int frame_size[MAX_FRAMES]; /** frame sizes */
int frame_duration; /** frame duration, in samples @ 48kHz */
enum OpusMode mode; /** mode */
enum OpusBandwidth bandwidth; /** bandwidth */
} OpusPacket;
typedef struct OpusStreamContext {
AVCodecContext *avctx;
int output_channels;
OpusRangeCoder rc;
OpusRangeCoder redundancy_rc;
SilkContext *silk;
CeltContext *celt;
AVFloatDSPContext *fdsp;
float silk_buf[2][960];
float *silk_output[2];
DECLARE_ALIGNED(32, float, celt_buf)[2][960];
float *celt_output[2];
float redundancy_buf[2][960];
float *redundancy_output[2];
/* data buffers for the final output data */
float *out[2];
int out_size;
float *out_dummy;
int out_dummy_allocated_size;
AVAudioResampleContext *avr;
AVAudioFifo *celt_delay;
int silk_samplerate;
/* number of samples we still want to get from the resampler */
int delayed_samples;
OpusPacket packet;
int redundancy_idx;
} OpusStreamContext;
// a mapping between an opus stream and an output channel
typedef struct ChannelMap {
int stream_idx;
int channel_idx;
// when a single decoded channel is mapped to multiple output channels, we
// write to the first output directly and copy from it to the others
// this field is set to 1 for those copied output channels
int copy;
// this is the index of the output channel to copy from
int copy_idx;
// this channel is silent
int silence;
} ChannelMap;
typedef struct OpusContext {
OpusStreamContext *streams;
int nb_streams;
int nb_stereo_streams;
AVFloatDSPContext fdsp;
int16_t gain_i;
float gain;
ChannelMap *channel_maps;
} OpusContext;
static av_always_inline void opus_rc_normalize(OpusRangeCoder *rc)
{
while (rc->range <= 1<<23) {
rc->value = ((rc->value << 8) | (get_bits(&rc->gb, 8) ^ 0xFF)) & ((1u << 31) - 1);
rc->range <<= 8;
rc->total_read_bits += 8;
}
}
static av_always_inline void opus_rc_update(OpusRangeCoder *rc, unsigned int scale,
unsigned int low, unsigned int high,
unsigned int total)
{
rc->value -= scale * (total - high);
rc->range = low ? scale * (high - low)
: rc->range - scale * (total - high);
opus_rc_normalize(rc);
}
static av_always_inline unsigned int opus_rc_getsymbol(OpusRangeCoder *rc, const uint16_t *cdf)
{
unsigned int k, scale, total, symbol, low, high;
total = *cdf++;
scale = rc->range / total;
symbol = rc->value / scale + 1;
symbol = total - FFMIN(symbol, total);
for (k = 0; cdf[k] <= symbol; k++);
high = cdf[k];
low = k ? cdf[k-1] : 0;
opus_rc_update(rc, scale, low, high, total);
return k;
}
static av_always_inline unsigned int opus_rc_p2model(OpusRangeCoder *rc, unsigned int bits)
{
unsigned int k, scale;
scale = rc->range >> bits; // in this case, scale = symbol
if (rc->value >= scale) {
rc->value -= scale;
rc->range -= scale;
k = 0;
} else {
rc->range = scale;
k = 1;
}
opus_rc_normalize(rc);
return k;
}
/**
* CELT: estimate bits of entropy that have thus far been consumed for the
* current CELT frame, to integer and fractional (1/8th bit) precision
*/
static av_always_inline unsigned int opus_rc_tell(const OpusRangeCoder *rc)
{
return rc->total_read_bits - av_log2(rc->range) - 1;
}
static av_always_inline unsigned int opus_rc_tell_frac(const OpusRangeCoder *rc)
{
unsigned int i, total_bits, rcbuffer, range;
total_bits = rc->total_read_bits << 3;
rcbuffer = av_log2(rc->range) + 1;
range = rc->range >> (rcbuffer-16);
for (i = 0; i < 3; i++) {
int bit;
range = range * range >> 15;
bit = range >> 16;
rcbuffer = rcbuffer << 1 | bit;
range >>= bit;
}
return total_bits - rcbuffer;
}
/**
* CELT: read 1-25 raw bits at the end of the frame, backwards byte-wise
*/
static av_always_inline unsigned int opus_getrawbits(OpusRangeCoder *rc, unsigned int count)
{
unsigned int value = 0;
while (rc->rb.bytes && rc->rb.cachelen < count) {
rc->rb.cacheval |= *--rc->rb.position << rc->rb.cachelen;
rc->rb.cachelen += 8;
rc->rb.bytes--;
}
value = rc->rb.cacheval & ((1<<count)-1);
rc->rb.cacheval >>= count;
rc->rb.cachelen -= count;
rc->total_read_bits += count;
return value;
}
/**
* CELT: read a uniform distribution
*/
static av_always_inline unsigned int opus_rc_unimodel(OpusRangeCoder *rc, unsigned int size)
{
unsigned int bits, k, scale, total;
bits = opus_ilog(size - 1);
total = (bits > 8) ? ((size - 1) >> (bits - 8)) + 1 : size;
scale = rc->range / total;
k = rc->value / scale + 1;
k = total - FFMIN(k, total);
opus_rc_update(rc, scale, k, k + 1, total);
if (bits > 8) {
k = k << (bits - 8) | opus_getrawbits(rc, bits - 8);
return FFMIN(k, size - 1);
} else
return k;
}
static av_always_inline int opus_rc_laplace(OpusRangeCoder *rc, unsigned int symbol, int decay)
{
/* extends the range coder to model a Laplace distribution */
int value = 0;
unsigned int scale, low = 0, center;
scale = rc->range >> 15;
center = rc->value / scale + 1;
center = (1 << 15) - FFMIN(center, 1 << 15);
if (center >= symbol) {
value++;
low = symbol;
symbol = 1 + ((32768 - 32 - symbol) * (16384-decay) >> 15);
while (symbol > 1 && center >= low + 2 * symbol) {
value++;
symbol *= 2;
low += symbol;
symbol = (((symbol - 2) * decay) >> 15) + 1;
}
if (symbol <= 1) {
int distance = (center - low) >> 1;
value += distance;
low += 2 * distance;
}
if (center < low + symbol)
value *= -1;
else
low += symbol;
}
opus_rc_update(rc, scale, low, FFMIN(low + symbol, 32768), 32768);
return value;
}
static av_always_inline unsigned int opus_rc_stepmodel(OpusRangeCoder *rc, int k0)
{
/* Use a probability of 3 up to itheta=8192 and then use 1 after */
unsigned int k, scale, symbol, total = (k0+1)*3 + k0;
scale = rc->range / total;
symbol = rc->value / scale + 1;
symbol = total - FFMIN(symbol, total);
k = (symbol < (k0+1)*3) ? symbol/3 : symbol - (k0+1)*2;
opus_rc_update(rc, scale, (k <= k0) ? 3*(k+0) : (k-1-k0) + 3*(k0+1),
(k <= k0) ? 3*(k+1) : (k-0-k0) + 3*(k0+1), total);
return k;
}
static av_always_inline unsigned int opus_rc_trimodel(OpusRangeCoder *rc, int qn)
{
unsigned int k, scale, symbol, total, low, center;
total = ((qn>>1) + 1) * ((qn>>1) + 1);
scale = rc->range / total;
center = rc->value / scale + 1;
center = total - FFMIN(center, total);
if (center < total >> 1) {
k = (ff_sqrt(8 * center + 1) - 1) >> 1;
low = k * (k + 1) >> 1;
symbol = k + 1;
} else {
k = (2*(qn + 1) - ff_sqrt(8*(total - center - 1) + 1)) >> 1;
low = total - ((qn + 1 - k) * (qn + 2 - k) >> 1);
symbol = qn + 1 - k;
}
opus_rc_update(rc, scale, low, low + symbol, total);
return k;
}
int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size,
int self_delimited);
int ff_opus_parse_extradata(AVCodecContext *avctx, OpusContext *s);
int ff_silk_init(AVCodecContext *avctx, SilkContext **ps, int output_channels);
void ff_silk_free(SilkContext **ps);
void ff_silk_flush(SilkContext *s);
/**
* Decode the LP layer of one Opus frame (which may correspond to several SILK
* frames).
*/
int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc,
float *output[2],
enum OpusBandwidth bandwidth, int coded_channels,
int duration_ms);
/**
* Init an iMDCT of the length 2 * 15 * (2^N)
*/
int ff_celt_imdct_init(CeltIMDCTContext **s, int N);
/**
* Free an iMDCT.
*/
void ff_celt_imdct_uninit(CeltIMDCTContext **s);
/**
* Calculate the middle half of the iMDCT
*/
void ff_celt_imdct_half(CeltIMDCTContext *s, float *dst, const float *src,
int src_stride, float scale);
int ff_celt_init(AVCodecContext *avctx, CeltContext **s, int output_channels);
void ff_celt_free(CeltContext **s);
void ff_celt_flush(CeltContext *s);
int ff_celt_decode_frame(CeltContext *s, OpusRangeCoder *rc,
float **output, int coded_channels, int frame_size,
int startband, int endband);
extern const float ff_celt_window2[120];
#endif /* AVCODEC_OPUS_H */
libavcodec/opus_celt.c 0 → 100644
浏览文件 @ b70d7a4a
/*
* Copyright (c) 2012 Andrew D'Addesio
* Copyright (c) 2013-2014 Mozilla Corporation
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Opus CELT decoder
*/
#include <stdint.h>
#include "libavutil/float_dsp.h"
#include "opus.h"
enum CeltSpread {
CELT_SPREAD_NONE,
CELT_SPREAD_LIGHT,
CELT_SPREAD_NORMAL,
CELT_SPREAD_AGGRESSIVE
};
typedef struct CeltFrame {
float energy[CELT_MAX_BANDS];
float prev_energy[2][CELT_MAX_BANDS];
uint8_t collapse_masks[CELT_MAX_BANDS];
/* buffer for mdct output + postfilter */
DECLARE_ALIGNED(32, float, buf)[2048];
/* postfilter parameters */
int pf_period_new;
float pf_gains_new[3];
int pf_period;
float pf_gains[3];
int pf_period_old;
float pf_gains_old[3];
float deemph_coeff;
} CeltFrame;
struct CeltContext {
// constant values that do not change during context lifetime
AVCodecContext *avctx;
CeltIMDCTContext *imdct[4];
AVFloatDSPContext dsp;
int output_channels;
// values that have inter-frame effect and must be reset on flush
CeltFrame frame[2];
uint32_t seed;
int flushed;
// values that only affect a single frame
int coded_channels;
int framebits;
int duration;
/* number of iMDCT blocks in the frame */
int blocks;
/* size of each block */
int blocksize;
int startband;
int endband;
int codedbands;
int anticollapse_bit;
int intensitystereo;
int dualstereo;
enum CeltSpread spread;
int remaining;
int remaining2;
int fine_bits [CELT_MAX_BANDS];
int fine_priority[CELT_MAX_BANDS];
int pulses [CELT_MAX_BANDS];
int tf_change [CELT_MAX_BANDS];
DECLARE_ALIGNED(32, float, coeffs)[2][CELT_MAX_FRAME_SIZE];
DECLARE_ALIGNED(32, float, scratch)[22 * 8]; // MAX(celt_freq_range) * 1<<CELT_MAX_LOG_BLOCKS
};
static const uint16_t celt_model_tapset[] = { 4, 2, 3, 4 };
static const uint16_t celt_model_spread[] = { 32, 7, 9, 30, 32 };
static const uint16_t celt_model_alloc_trim[] = {
128, 2, 4, 9, 19, 41, 87, 109, 119, 124, 126, 128
};
static const uint16_t celt_model_energy_small[] = { 4, 2, 3, 4 };
static const uint8_t celt_freq_bands[] = { /* in steps of 200Hz */
0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 34, 40, 48, 60, 78, 100
};
static const uint8_t celt_freq_range[] = {
1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 6, 6, 8, 12, 18, 22
};
static const uint8_t celt_log_freq_range[] = {
0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 16, 16, 16, 21, 21, 24, 29, 34, 36
};
static const int8_t celt_tf_select[4][2][2][2] = {
{ { { 0, -1 }, { 0, -1 } }, { { 0, -1 }, { 0, -1 } } },
{ { { 0, -1 }, { 0, -2 } }, { { 1, 0 }, { 1, -1 } } },
{ { { 0, -2 }, { 0, -3 } }, { { 2, 0 }, { 1, -1 } } },
{ { { 0, -2 }, { 0, -3 } }, { { 3, 0 }, { 1, -1 } } }
};
static const float celt_mean_energy[] = {
6.437500f, 6.250000f, 5.750000f, 5.312500f, 5.062500f,
4.812500f, 4.500000f, 4.375000f, 4.875000f, 4.687500f,
4.562500f, 4.437500f, 4.875000f, 4.625000f, 4.312500f,
4.500000f, 4.375000f, 4.625000f, 4.750000f, 4.437500f,
3.750000f, 3.750000f, 3.750000f, 3.750000f, 3.750000f
};
static const float celt_alpha_coef[] = {
29440.0f/32768.0f, 26112.0f/32768.0f, 21248.0f/32768.0f, 16384.0f/32768.0f
};
static const float celt_beta_coef[] = { /* TODO: precompute 1 minus this if the code ends up neater */
30147.0f/32768.0f, 22282.0f/32768.0f, 12124.0f/32768.0f, 6554.0f/32768.0f
};
static const uint8_t celt_coarse_energy_dist[4][2][42] = {
{
{ // 120-sample inter
72, 127, 65, 129, 66, 128, 65, 128, 64, 128, 62, 128, 64, 128,
64, 128, 92, 78, 92, 79, 92, 78, 90, 79, 116, 41, 115, 40,
114, 40, 132, 26, 132, 26, 145, 17, 161, 12, 176, 10, 177, 11
}, { // 120-sample intra
24, 179, 48, 138, 54, 135, 54, 132, 53, 134, 56, 133, 55, 132,
55, 132, 61, 114, 70, 96, 74, 88, 75, 88, 87, 74, 89, 66,
91, 67, 100, 59, 108, 50, 120, 40, 122, 37, 97, 43, 78, 50
}
}, {
{ // 240-sample inter
83, 78, 84, 81, 88, 75, 86, 74, 87, 71, 90, 73, 93, 74,
93, 74, 109, 40, 114, 36, 117, 34, 117, 34, 143, 17, 145, 18,
146, 19, 162, 12, 165, 10, 178, 7, 189, 6, 190, 8, 177, 9
}, { // 240-sample intra
23, 178, 54, 115, 63, 102, 66, 98, 69, 99, 74, 89, 71, 91,
73, 91, 78, 89, 86, 80, 92, 66, 93, 64, 102, 59, 103, 60,
104, 60, 117, 52, 123, 44, 138, 35, 133, 31, 97, 38, 77, 45
}
}, {
{ // 480-sample inter
61, 90, 93, 60, 105, 42, 107, 41, 110, 45, 116, 38, 113, 38,
112, 38, 124, 26, 132, 27, 136, 19, 140, 20, 155, 14, 159, 16,
158, 18, 170, 13, 177, 10, 187, 8, 192, 6, 175, 9, 159, 10
}, { // 480-sample intra
21, 178, 59, 110, 71, 86, 75, 85, 84, 83, 91, 66, 88, 73,
87, 72, 92, 75, 98, 72, 105, 58, 107, 54, 115, 52, 114, 55,
112, 56, 129, 51, 132, 40, 150, 33, 140, 29, 98, 35, 77, 42
}
}, {
{ // 960-sample inter
42, 121, 96, 66, 108, 43, 111, 40, 117, 44, 123, 32, 120, 36,
119, 33, 127, 33, 134, 34, 139, 21, 147, 23, 152, 20, 158, 25,
154, 26, 166, 21, 173, 16, 184, 13, 184, 10, 150, 13, 139, 15
}, { // 960-sample intra
22, 178, 63, 114, 74, 82, 84, 83, 92, 82, 103, 62, 96, 72,
96, 67, 101, 73, 107, 72, 113, 55, 118, 52, 125, 52, 118, 52,
117, 55, 135, 49, 137, 39, 157, 32, 145, 29, 97, 33, 77, 40
}
}
};
static const uint8_t celt_static_alloc[11][21] = { /* 1/32 bit/sample */
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 90, 80, 75, 69, 63, 56, 49, 40, 34, 29, 20, 18, 10, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 110, 100, 90, 84, 78, 71, 65, 58, 51, 45, 39, 32, 26, 20, 12, 0, 0, 0, 0, 0, 0 },
{ 118, 110, 103, 93, 86, 80, 75, 70, 65, 59, 53, 47, 40, 31, 23, 15, 4, 0, 0, 0, 0 },
{ 126, 119, 112, 104, 95, 89, 83, 78, 72, 66, 60, 54, 47, 39, 32, 25, 17, 12, 1, 0, 0 },
{ 134, 127, 120, 114, 103, 97, 91, 85, 78, 72, 66, 60, 54, 47, 41, 35, 29, 23, 16, 10, 1 },
{ 144, 137, 130, 124, 113, 107, 101, 95, 88, 82, 76, 70, 64, 57, 51, 45, 39, 33, 26, 15, 1 },
{ 152, 145, 138, 132, 123, 117, 111, 105, 98, 92, 86, 80, 74, 67, 61, 55, 49, 43, 36, 20, 1 },
{ 162, 155, 148, 142, 133, 127, 121, 115, 108, 102, 96, 90, 84, 77, 71, 65, 59, 53, 46, 30, 1 },
{ 172, 165, 158, 152, 143, 137, 131, 125, 118, 112, 106, 100, 94, 87, 81, 75, 69, 63, 56, 45, 20 },
{ 200, 200, 200, 200, 200, 200, 200, 200, 198, 193, 188, 183, 178, 173, 168, 163, 158, 153, 148, 129, 104 }
};
static const uint8_t celt_static_caps[4][2][21] = {
{ // 120-sample
{224, 224, 224, 224, 224, 224, 224, 224, 160, 160,
160, 160, 185, 185, 185, 178, 178, 168, 134, 61, 37},
{224, 224, 224, 224, 224, 224, 224, 224, 240, 240,
240, 240, 207, 207, 207, 198, 198, 183, 144, 66, 40},
}, { // 240-sample
{160, 160, 160, 160, 160, 160, 160, 160, 185, 185,
185, 185, 193, 193, 193, 183, 183, 172, 138, 64, 38},
{240, 240, 240, 240, 240, 240, 240, 240, 207, 207,
207, 207, 204, 204, 204, 193, 193, 180, 143, 66, 40},
}, { // 480-sample
{185, 185, 185, 185, 185, 185, 185, 185, 193, 193,
193, 193, 193, 193, 193, 183, 183, 172, 138, 65, 39},
{207, 207, 207, 207, 207, 207, 207, 207, 204, 204,
204, 204, 201, 201, 201, 188, 188, 176, 141, 66, 40},
}, { // 960-sample
{193, 193, 193, 193, 193, 193, 193, 193, 193, 193,
193, 193, 194, 194, 194, 184, 184, 173, 139, 65, 39},
{204, 204, 204, 204, 204, 204, 204, 204, 201, 201,
201, 201, 198, 198, 198, 187, 187, 175, 140, 66, 40}
}
};
static const uint8_t celt_cache_bits[392] = {
40, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 40, 15, 23, 28,
31, 34, 36, 38, 39, 41, 42, 43, 44, 45, 46, 47, 47, 49, 50,
51, 52, 53, 54, 55, 55, 57, 58, 59, 60, 61, 62, 63, 63, 65,
66, 67, 68, 69, 70, 71, 71, 40, 20, 33, 41, 48, 53, 57, 61,
64, 66, 69, 71, 73, 75, 76, 78, 80, 82, 85, 87, 89, 91, 92,
94, 96, 98, 101, 103, 105, 107, 108, 110, 112, 114, 117, 119, 121, 123,
124, 126, 128, 40, 23, 39, 51, 60, 67, 73, 79, 83, 87, 91, 94,
97, 100, 102, 105, 107, 111, 115, 118, 121, 124, 126, 129, 131, 135, 139,
142, 145, 148, 150, 153, 155, 159, 163, 166, 169, 172, 174, 177, 179, 35,
28, 49, 65, 78, 89, 99, 107, 114, 120, 126, 132, 136, 141, 145, 149,
153, 159, 165, 171, 176, 180, 185, 189, 192, 199, 205, 211, 216, 220, 225,
229, 232, 239, 245, 251, 21, 33, 58, 79, 97, 112, 125, 137, 148, 157,
166, 174, 182, 189, 195, 201, 207, 217, 227, 235, 243, 251, 17, 35, 63,
86, 106, 123, 139, 152, 165, 177, 187, 197, 206, 214, 222, 230, 237, 250,
25, 31, 55, 75, 91, 105, 117, 128, 138, 146, 154, 161, 168, 174, 180,
185, 190, 200, 208, 215, 222, 229, 235, 240, 245, 255, 16, 36, 65, 89,
110, 128, 144, 159, 173, 185, 196, 207, 217, 226, 234, 242, 250, 11, 41,
74, 103, 128, 151, 172, 191, 209, 225, 241, 255, 9, 43, 79, 110, 138,
163, 186, 207, 227, 246, 12, 39, 71, 99, 123, 144, 164, 182, 198, 214,
228, 241, 253, 9, 44, 81, 113, 142, 168, 192, 214, 235, 255, 7, 49,
90, 127, 160, 191, 220, 247, 6, 51, 95, 134, 170, 203, 234, 7, 47,
87, 123, 155, 184, 212, 237, 6, 52, 97, 137, 174, 208, 240, 5, 57,
106, 151, 192, 231, 5, 59, 111, 158, 202, 243, 5, 55, 103, 147, 187,
224, 5, 60, 113, 161, 206, 248, 4, 65, 122, 175, 224, 4, 67, 127,
182, 234
};
static const int16_t celt_cache_index[105] = {
-1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 41, 41, 41,
82, 82, 123, 164, 200, 222, 0, 0, 0, 0, 0, 0, 0, 0, 41,
41, 41, 41, 123, 123, 123, 164, 164, 240, 266, 283, 295, 41, 41, 41,
41, 41, 41, 41, 41, 123, 123, 123, 123, 240, 240, 240, 266, 266, 305,
318, 328, 336, 123, 123, 123, 123, 123, 123, 123, 123, 240, 240, 240, 240,
305, 305, 305, 318, 318, 343, 351, 358, 364, 240, 240, 240, 240, 240, 240,
240, 240, 305, 305, 305, 305, 343, 343, 343, 351, 351, 370, 376, 382, 387,
};
static const uint8_t celt_log2_frac[] = {
0, 8, 13, 16, 19, 21, 23, 24, 26, 27, 28, 29, 30, 31, 32, 32, 33, 34, 34, 35, 36, 36, 37, 37
};
static const uint8_t celt_bit_interleave[] = {
0, 1, 1, 1, 2, 3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3
};
static const uint8_t celt_bit_deinterleave[] = {
0x00, 0x03, 0x0C, 0x0F, 0x30, 0x33, 0x3C, 0x3F,
0xC0, 0xC3, 0xCC, 0xCF, 0xF0, 0xF3, 0xFC, 0xFF
};
static const uint8_t celt_hadamard_ordery[] = {
1, 0,
3, 0, 2, 1,
7, 0, 4, 3, 6, 1, 5, 2,
15, 0, 8, 7, 12, 3, 11, 4, 14, 1, 9, 6, 13, 2, 10, 5
};
static const uint16_t celt_qn_exp2[] = {
16384, 17866, 19483, 21247, 23170, 25267, 27554, 30048
};
static const uint32_t celt_pvq_u[1272] = {
/* N = 0, K = 0...176 */
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* N = 1, K = 1...176 */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* N = 2, K = 2...176 */
3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41,
43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79,
81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113,
115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143,
145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173,
175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203,
205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233,
235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263,
265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293,
295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323,
325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351,
/* N = 3, K = 3...176 */
13, 25, 41, 61, 85, 113, 145, 181, 221, 265, 313, 365, 421, 481, 545, 613,
685, 761, 841, 925, 1013, 1105, 1201, 1301, 1405, 1513, 1625, 1741, 1861,
1985, 2113, 2245, 2381, 2521, 2665, 2813, 2965, 3121, 3281, 3445, 3613, 3785,
3961, 4141, 4325, 4513, 4705, 4901, 5101, 5305, 5513, 5725, 5941, 6161, 6385,
6613, 6845, 7081, 7321, 7565, 7813, 8065, 8321, 8581, 8845, 9113, 9385, 9661,
9941, 10225, 10513, 10805, 11101, 11401, 11705, 12013, 12325, 12641, 12961,
13285, 13613, 13945, 14281, 14621, 14965, 15313, 15665, 16021, 16381, 16745,
17113, 17485, 17861, 18241, 18625, 19013, 19405, 19801, 20201, 20605, 21013,
21425, 21841, 22261, 22685, 23113, 23545, 23981, 24421, 24865, 25313, 25765,
26221, 26681, 27145, 27613, 28085, 28561, 29041, 29525, 30013, 30505, 31001,
31501, 32005, 32513, 33025, 33541, 34061, 34585, 35113, 35645, 36181, 36721,
37265, 37813, 38365, 38921, 39481, 40045, 40613, 41185, 41761, 42341, 42925,
43513, 44105, 44701, 45301, 45905, 46513, 47125, 47741, 48361, 48985, 49613,
50245, 50881, 51521, 52165, 52813, 53465, 54121, 54781, 55445, 56113, 56785,
57461, 58141, 58825, 59513, 60205, 60901, 61601,
/* N = 4, K = 4...176 */
63, 129, 231, 377, 575, 833, 1159, 1561, 2047, 2625, 3303, 4089, 4991, 6017,
7175, 8473, 9919, 11521, 13287, 15225, 17343, 19649, 22151, 24857, 27775,
30913, 34279, 37881, 41727, 45825, 50183, 54809, 59711, 64897, 70375, 76153,
82239, 88641, 95367, 102425, 109823, 117569, 125671, 134137, 142975, 152193,
161799, 171801, 182207, 193025, 204263, 215929, 228031, 240577, 253575,
267033, 280959, 295361, 310247, 325625, 341503, 357889, 374791, 392217,
410175, 428673, 447719, 467321, 487487, 508225, 529543, 551449, 573951,
597057, 620775, 645113, 670079, 695681, 721927, 748825, 776383, 804609,
833511, 863097, 893375, 924353, 956039, 988441, 1021567, 1055425, 1090023,
1125369, 1161471, 1198337, 1235975, 1274393, 1313599, 1353601, 1394407,
1436025, 1478463, 1521729, 1565831, 1610777, 1656575, 1703233, 1750759,
1799161, 1848447, 1898625, 1949703, 2001689, 2054591, 2108417, 2163175,
2218873, 2275519, 2333121, 2391687, 2451225, 2511743, 2573249, 2635751,
2699257, 2763775, 2829313, 2895879, 2963481, 3032127, 3101825, 3172583,
3244409, 3317311, 3391297, 3466375, 3542553, 3619839, 3698241, 3777767,
3858425, 3940223, 4023169, 4107271, 4192537, 4278975, 4366593, 4455399,
4545401, 4636607, 4729025, 4822663, 4917529, 5013631, 5110977, 5209575,
5309433, 5410559, 5512961, 5616647, 5721625, 5827903, 5935489, 6044391,
6154617, 6266175, 6379073, 6493319, 6608921, 6725887, 6844225, 6963943,
7085049, 7207551,
/* N = 5, K = 5...176 */
321, 681, 1289, 2241, 3649, 5641, 8361, 11969, 16641, 22569, 29961, 39041,
50049, 63241, 78889, 97281, 118721, 143529, 172041, 204609, 241601, 283401,
330409, 383041, 441729, 506921, 579081, 658689, 746241, 842249, 947241,
1061761, 1186369, 1321641, 1468169, 1626561, 1797441, 1981449, 2179241,
2391489, 2618881, 2862121, 3121929, 3399041, 3694209, 4008201, 4341801,
4695809, 5071041, 5468329, 5888521, 6332481, 6801089, 7295241, 7815849,
8363841, 8940161, 9545769, 10181641, 10848769, 11548161, 12280841, 13047849,
13850241, 14689089, 15565481, 16480521, 17435329, 18431041, 19468809,
20549801, 21675201, 22846209, 24064041, 25329929, 26645121, 28010881,
29428489, 30899241, 32424449, 34005441, 35643561, 37340169, 39096641,
40914369, 42794761, 44739241, 46749249, 48826241, 50971689, 53187081,
55473921, 57833729, 60268041, 62778409, 65366401, 68033601, 70781609,
73612041, 76526529, 79526721, 82614281, 85790889, 89058241, 92418049,
95872041, 99421961, 103069569, 106816641, 110664969, 114616361, 118672641,
122835649, 127107241, 131489289, 135983681, 140592321, 145317129, 150160041,
155123009, 160208001, 165417001, 170752009, 176215041, 181808129, 187533321,
193392681, 199388289, 205522241, 211796649, 218213641, 224775361, 231483969,
238341641, 245350569, 252512961, 259831041, 267307049, 274943241, 282741889,
290705281, 298835721, 307135529, 315607041, 324252609, 333074601, 342075401,
351257409, 360623041, 370174729, 379914921, 389846081, 399970689, 410291241,
420810249, 431530241, 442453761, 453583369, 464921641, 476471169, 488234561,
500214441, 512413449, 524834241, 537479489, 550351881, 563454121, 576788929,
590359041, 604167209, 618216201, 632508801,
/* N = 6, K = 6...96 (technically V(109,5) fits in 32 bits, but that can't be
achieved by splitting an Opus band) */
1683, 3653, 7183, 13073, 22363, 36365, 56695, 85305, 124515, 177045, 246047,
335137, 448427, 590557, 766727, 982729, 1244979, 1560549, 1937199, 2383409,
2908411, 3522221, 4235671, 5060441, 6009091, 7095093, 8332863, 9737793,
11326283, 13115773, 15124775, 17372905, 19880915, 22670725, 25765455,
29189457, 32968347, 37129037, 41699767, 46710137, 52191139, 58175189,
64696159, 71789409, 79491819, 87841821, 96879431, 106646281, 117185651,
128542501, 140763503, 153897073, 167993403, 183104493, 199284183, 216588185,
235074115, 254801525, 275831935, 298228865, 322057867, 347386557, 374284647,
402823977, 433078547, 465124549, 499040399, 534906769, 572806619, 612825229,
655050231, 699571641, 746481891, 795875861, 847850911, 902506913, 959946283,
1020274013, 1083597703, 1150027593, 1219676595, 1292660325, 1369097135,
1449108145, 1532817275, 1620351277, 1711839767, 1807415257, 1907213187,
2011371957, 2120032959,
/* N = 7, K = 7...54 (technically V(60,6) fits in 32 bits, but that can't be
achieved by splitting an Opus band) */
8989, 19825, 40081, 75517, 134245, 227305, 369305, 579125, 880685, 1303777,
1884961, 2668525, 3707509, 5064793, 6814249, 9041957, 11847485, 15345233,
19665841, 24957661, 31388293, 39146185, 48442297, 59511829, 72616013,
88043969, 106114625, 127178701, 151620757, 179861305, 212358985, 249612805,
292164445, 340600625, 395555537, 457713341, 527810725, 606639529, 695049433,
793950709, 904317037, 1027188385, 1163673953, 1314955181, 1482288821,
1667010073, 1870535785, 2094367717,
/* N = 8, K = 8...37 (technically V(40,7) fits in 32 bits, but that can't be
achieved by splitting an Opus band) */
48639, 108545, 224143, 433905, 795455, 1392065, 2340495, 3800305, 5984767,
9173505, 13726991, 20103025, 28875327, 40754369, 56610575, 77500017,
104692735, 139703809, 184327311, 240673265, 311207743, 398796225, 506750351,
638878193, 799538175, 993696769, 1226990095, 1505789553, 1837271615,
2229491905,
/* N = 9, K = 9...28 (technically V(29,8) fits in 32 bits, but that can't be
achieved by splitting an Opus band) */
265729, 598417, 1256465, 2485825, 4673345, 8405905, 14546705, 24331777,
39490049, 62390545, 96220561, 145198913, 214828609, 312193553, 446304145,
628496897, 872893441, 1196924561, 1621925137, 2173806145,
/* N = 10, K = 10...24 */
1462563, 3317445, 7059735, 14218905, 27298155, 50250765, 89129247, 152951073,
254831667, 413442773, 654862247, 1014889769, 1541911931, 2300409629,
3375210671,
/* N = 11, K = 11...19 (technically V(20,10) fits in 32 bits, but that can't be
achieved by splitting an Opus band) */
8097453, 18474633, 39753273, 81270333, 158819253, 298199265, 540279585,
948062325, 1616336765,
/* N = 12, K = 12...18 */
45046719, 103274625, 224298231, 464387817, 921406335, 1759885185,
3248227095,
/* N = 13, K = 13...16 */
251595969, 579168825, 1267854873, 2653649025,
/* N = 14, K = 14 */
1409933619
};
DECLARE_ALIGNED(32, static const float, celt_window)[120] = {
6.7286966e-05f, 0.00060551348f, 0.0016815970f, 0.0032947962f, 0.0054439943f,
0.0081276923f, 0.011344001f, 0.015090633f, 0.019364886f, 0.024163635f,
0.029483315f, 0.035319905f, 0.041668911f, 0.048525347f, 0.055883718f,
0.063737999f, 0.072081616f, 0.080907428f, 0.090207705f, 0.099974111f,
0.11019769f, 0.12086883f, 0.13197729f, 0.14351214f, 0.15546177f,
0.16781389f, 0.18055550f, 0.19367290f, 0.20715171f, 0.22097682f,
0.23513243f, 0.24960208f, 0.26436860f, 0.27941419f, 0.29472040f,
0.31026818f, 0.32603788f, 0.34200931f, 0.35816177f, 0.37447407f,
0.39092462f, 0.40749142f, 0.42415215f, 0.44088423f, 0.45766484f,
0.47447104f, 0.49127978f, 0.50806798f, 0.52481261f, 0.54149077f,
0.55807973f, 0.57455701f, 0.59090049f, 0.60708841f, 0.62309951f,
0.63891306f, 0.65450896f, 0.66986776f, 0.68497077f, 0.69980010f,
0.71433873f, 0.72857055f, 0.74248043f, 0.75605424f, 0.76927895f,
0.78214257f, 0.79463430f, 0.80674445f, 0.81846456f, 0.82978733f,
0.84070669f, 0.85121779f, 0.86131698f, 0.87100183f, 0.88027111f,
0.88912479f, 0.89756398f, 0.90559094f, 0.91320904f, 0.92042270f,
0.92723738f, 0.93365955f, 0.93969656f, 0.94535671f, 0.95064907f,
0.95558353f, 0.96017067f, 0.96442171f, 0.96834849f, 0.97196334f,
0.97527906f, 0.97830883f, 0.98106616f, 0.98356480f, 0.98581869f,
0.98784191f, 0.98964856f, 0.99125274f, 0.99266849f, 0.99390969f,
0.99499004f, 0.99592297f, 0.99672162f, 0.99739874f, 0.99796667f,
0.99843728f, 0.99882195f, 0.99913147f, 0.99937606f, 0.99956527f,
0.99970802f, 0.99981248f, 0.99988613f, 0.99993565f, 0.99996697f,
0.99998518f, 0.99999457f, 0.99999859f, 0.99999982f, 1.0000000f,
};
/* square of the window, used for the postfilter */
const float ff_celt_window2[120] = {
4.5275357e-09f, 3.66647e-07f, 2.82777e-06f, 1.08557e-05f, 2.96371e-05f, 6.60594e-05f,
0.000128686f, 0.000227727f, 0.000374999f, 0.000583881f, 0.000869266f, 0.0012475f,
0.0017363f, 0.00235471f, 0.00312299f, 0.00406253f, 0.00519576f, 0.00654601f,
0.00813743f, 0.00999482f, 0.0121435f, 0.0146093f, 0.017418f, 0.0205957f, 0.0241684f,
0.0281615f, 0.0326003f, 0.0375092f, 0.0429118f, 0.0488308f, 0.0552873f, 0.0623012f,
0.0698908f, 0.0780723f, 0.0868601f, 0.0962664f, 0.106301f, 0.11697f, 0.12828f,
0.140231f, 0.152822f, 0.166049f, 0.179905f, 0.194379f, 0.209457f, 0.225123f, 0.241356f,
0.258133f, 0.275428f, 0.293212f, 0.311453f, 0.330116f, 0.349163f, 0.368556f, 0.388253f,
0.40821f, 0.428382f, 0.448723f, 0.469185f, 0.48972f, 0.51028f, 0.530815f, 0.551277f,
0.571618f, 0.59179f, 0.611747f, 0.631444f, 0.650837f, 0.669884f, 0.688547f, 0.706788f,
0.724572f, 0.741867f, 0.758644f, 0.774877f, 0.790543f, 0.805621f, 0.820095f, 0.833951f,
0.847178f, 0.859769f, 0.87172f, 0.88303f, 0.893699f, 0.903734f, 0.91314f, 0.921928f,
0.930109f, 0.937699f, 0.944713f, 0.951169f, 0.957088f, 0.962491f, 0.9674f, 0.971838f,
0.975832f, 0.979404f, 0.982582f, 0.985391f, 0.987857f, 0.990005f, 0.991863f, 0.993454f,
0.994804f, 0.995937f, 0.996877f, 0.997645f, 0.998264f, 0.998753f, 0.999131f, 0.999416f,
0.999625f, 0.999772f, 0.999871f, 0.999934f, 0.99997f, 0.999989f, 0.999997f, 0.99999964f, 1.0f,
};
static const uint32_t * const celt_pvq_u_row[15] = {
celt_pvq_u + 0, celt_pvq_u + 176, celt_pvq_u + 351,
celt_pvq_u + 525, celt_pvq_u + 698, celt_pvq_u + 870,
celt_pvq_u + 1041, celt_pvq_u + 1131, celt_pvq_u + 1178,
celt_pvq_u + 1207, celt_pvq_u + 1226, celt_pvq_u + 1240,
celt_pvq_u + 1248, celt_pvq_u + 1254, celt_pvq_u + 1257
};
static inline int16_t celt_cos(int16_t x)
{
x = (MUL16(x, x) + 4096) >> 13;
x = (32767-x) + ROUND_MUL16(x, (-7651 + ROUND_MUL16(x, (8277 + ROUND_MUL16(-626, x)))));
return 1+x;
}
static inline int celt_log2tan(int isin, int icos)
{
int lc, ls;
lc = opus_ilog(icos);
ls = opus_ilog(isin);
icos <<= 15 - lc;
isin <<= 15 - ls;
return (ls << 11) - (lc << 11) +
ROUND_MUL16(isin, ROUND_MUL16(isin, -2597) + 7932) -
ROUND_MUL16(icos, ROUND_MUL16(icos, -2597) + 7932);
}
static inline uint32_t celt_rng(CeltContext *s)
{
s->seed = 1664525 * s->seed + 1013904223;
return s->seed;
}
static void celt_decode_coarse_energy(CeltContext *s, OpusRangeCoder *rc)
{
int i, j;
float prev[2] = {0};
float alpha, beta;
const uint8_t *model;
/* use the 2D z-transform to apply prediction in both */
/* the time domain (alpha) and the frequency domain (beta) */
if (opus_rc_tell(rc)+3 <= s->framebits && opus_rc_p2model(rc, 3)) {
/* intra frame */
alpha = 0;
beta = 1.0f - 4915.0f/32768.0f;
model = celt_coarse_energy_dist[s->duration][1];
} else {
alpha = celt_alpha_coef[s->duration];
beta = 1.0f - celt_beta_coef[s->duration];
model = celt_coarse_energy_dist[s->duration][0];
}
for (i = 0; i < CELT_MAX_BANDS; i++) {
for (j = 0; j < s->coded_channels; j++) {
CeltFrame *frame = &s->frame[j];
float value;
int available;
if (i < s->startband || i >= s->endband) {
frame->energy[i] = 0.0;
continue;
}
available = s->framebits - opus_rc_tell(rc);
if (available >= 15) {
/* decode using a Laplace distribution */
int k = FFMIN(i, 20) << 1;
value = opus_rc_laplace(rc, model[k] << 7, model[k+1] << 6);
} else if (available >= 2) {
int x = opus_rc_getsymbol(rc, celt_model_energy_small);
value = (x>>1) ^ -(x&1);
} else if (available >= 1) {
value = -(float)opus_rc_p2model(rc, 1);
} else value = -1;
frame->energy[i] = FFMAX(-9.0f, frame->energy[i]) * alpha + prev[j] + value;
prev[j] += beta * value;
}
}
}
static void celt_decode_fine_energy(CeltContext *s, OpusRangeCoder *rc)
{
int i;
for (i = s->startband; i < s->endband; i++) {
int j;
if (!s->fine_bits[i])
continue;
for (j = 0; j < s->coded_channels; j++) {
CeltFrame *frame = &s->frame[j];
int q2;
float offset;
q2 = opus_getrawbits(rc, s->fine_bits[i]);
offset = (q2 + 0.5f) * (1 << (14 - s->fine_bits[i])) / 16384.0f - 0.5f;
frame->energy[i] += offset;
}
}
}
static void celt_decode_final_energy(CeltContext *s, OpusRangeCoder *rc,
int bits_left)
{
int priority, i, j;
for (priority = 0; priority < 2; priority++) {
for (i = s->startband; i < s->endband && bits_left >= s->coded_channels; i++) {
if (s->fine_priority[i] != priority || s->fine_bits[i] >= CELT_MAX_FINE_BITS)
continue;
for (j = 0; j < s->coded_channels; j++) {
int q2;
float offset;
q2 = opus_getrawbits(rc, 1);
offset = (q2 - 0.5f) * (1 << (14 - s->fine_bits[i] - 1)) / 16384.0f;
s->frame[j].energy[i] += offset;
bits_left--;
}
}
}
}
static void celt_decode_tf_changes(CeltContext *s, OpusRangeCoder *rc,
int transient)
{
int i, diff = 0, tf_select = 0, tf_changed = 0, tf_select_bit;
int consumed, bits = transient ? 2 : 4;
consumed = opus_rc_tell(rc);
tf_select_bit = (s->duration != 0 && consumed+bits+1 <= s->framebits);
for (i = s->startband; i < s->endband; i++) {
if (consumed+bits+tf_select_bit <= s->framebits) {
diff ^= opus_rc_p2model(rc, bits);
consumed = opus_rc_tell(rc);
tf_changed |= diff;
}
s->tf_change[i] = diff;
bits = transient ? 4 : 5;
}
if (tf_select_bit && celt_tf_select[s->duration][transient][0][tf_changed] !=
celt_tf_select[s->duration][transient][1][tf_changed])
tf_select = opus_rc_p2model(rc, 1);
for (i = s->startband; i < s->endband; i++) {
s->tf_change[i] = celt_tf_select[s->duration][transient][tf_select][s->tf_change[i]];
}
}
static void celt_decode_allocation(CeltContext *s, OpusRangeCoder *rc)
{
// approx. maximum bit allocation for each band before boost/trim
int cap[CELT_MAX_BANDS];
int boost[CELT_MAX_BANDS];
int threshold[CELT_MAX_BANDS];
int bits1[CELT_MAX_BANDS];
int bits2[CELT_MAX_BANDS];
int trim_offset[CELT_MAX_BANDS];
int skip_startband = s->startband;
int dynalloc = 6;
int alloctrim = 5;
int extrabits = 0;
int skip_bit = 0;
int intensitystereo_bit = 0;
int dualstereo_bit = 0;
int remaining, bandbits;
int low, high, total, done;
int totalbits;
int consumed;
int i, j;
consumed = opus_rc_tell(rc);
/* obtain spread flag */
s->spread = CELT_SPREAD_NORMAL;
if (consumed + 4 <= s->framebits)
s->spread = opus_rc_getsymbol(rc, celt_model_spread);
/* generate static allocation caps */
for (i = 0; i < CELT_MAX_BANDS; i++) {
cap[i] = (celt_static_caps[s->duration][s->coded_channels - 1][i] + 64)
* celt_freq_range[i] << (s->coded_channels - 1) << s->duration >> 2;
}
/* obtain band boost */
totalbits = s->framebits << 3; // convert to 1/8 bits
consumed = opus_rc_tell_frac(rc);
for (i = s->startband; i < s->endband; i++) {
int quanta, band_dynalloc;
boost[i] = 0;
quanta = celt_freq_range[i] << (s->coded_channels - 1) << s->duration;
quanta = FFMIN(quanta << 3, FFMAX(6 << 3, quanta));
band_dynalloc = dynalloc;
while (consumed + (band_dynalloc<<3) < totalbits && boost[i] < cap[i]) {
int add = opus_rc_p2model(rc, band_dynalloc);
consumed = opus_rc_tell_frac(rc);
if (!add)
break;
boost[i] += quanta;
totalbits -= quanta;
band_dynalloc = 1;
}
/* dynalloc is more likely to occur if it's already been used for earlier bands */
if (boost[i])
dynalloc = FFMAX(2, dynalloc - 1);
}
/* obtain allocation trim */
if (consumed + (6 << 3) <= totalbits)
alloctrim = opus_rc_getsymbol(rc, celt_model_alloc_trim);
/* anti-collapse bit reservation */
totalbits = (s->framebits << 3) - opus_rc_tell_frac(rc) - 1;
s->anticollapse_bit = 0;
if (s->blocks > 1 && s->duration >= 2 &&
totalbits >= ((s->duration + 2) << 3))
s->anticollapse_bit = 1 << 3;
totalbits -= s->anticollapse_bit;
/* band skip bit reservation */
if (totalbits >= 1 << 3)
skip_bit = 1 << 3;
totalbits -= skip_bit;
/* intensity/dual stereo bit reservation */
if (s->coded_channels == 2) {
intensitystereo_bit = celt_log2_frac[s->endband - s->startband];
if (intensitystereo_bit <= totalbits) {
totalbits -= intensitystereo_bit;
if (totalbits >= 1 << 3) {
dualstereo_bit = 1 << 3;
totalbits -= 1 << 3;
}
} else
intensitystereo_bit = 0;
}
for (i = s->startband; i < s->endband; i++) {
int trim = alloctrim - 5 - s->duration;
int band = celt_freq_range[i] * (s->endband - i - 1);
int duration = s->duration + 3;
int scale = duration + s->coded_channels - 1;
/* PVQ minimum allocation threshold, below this value the band is
* skipped */
threshold[i] = FFMAX(3 * celt_freq_range[i] << duration >> 4,
s->coded_channels << 3);
trim_offset[i] = trim * (band << scale) >> 6;
if (celt_freq_range[i] << s->duration == 1)
trim_offset[i] -= s->coded_channels << 3;
}
/* bisection */
low = 1;
high = CELT_VECTORS - 1;
while (low <= high) {
int center = (low + high) >> 1;
done = total = 0;
for (i = s->endband - 1; i >= s->startband; i--) {
bandbits = celt_freq_range[i] * celt_static_alloc[center][i]
<< (s->coded_channels - 1) << s->duration >> 2;
if (bandbits)
bandbits = FFMAX(0, bandbits + trim_offset[i]);
bandbits += boost[i];
if (bandbits >= threshold[i] || done) {
done = 1;
total += FFMIN(bandbits, cap[i]);
} else if (bandbits >= s->coded_channels << 3)
total += s->coded_channels << 3;
}
if (total > totalbits)
high = center - 1;
else
low = center + 1;
}
high = low--;
for (i = s->startband; i < s->endband; i++) {
bits1[i] = celt_freq_range[i] * celt_static_alloc[low][i]
<< (s->coded_channels - 1) << s->duration >> 2;
bits2[i] = high >= CELT_VECTORS ? cap[i] :
celt_freq_range[i] * celt_static_alloc[high][i]
<< (s->coded_channels - 1) << s->duration >> 2;
if (bits1[i])
bits1[i] = FFMAX(0, bits1[i] + trim_offset[i]);
if (bits2[i])
bits2[i] = FFMAX(0, bits2[i] + trim_offset[i]);
if (low)
bits1[i] += boost[i];
bits2[i] += boost[i];
if (boost[i])
skip_startband = i;
bits2[i] = FFMAX(0, bits2[i] - bits1[i]);
}
/* bisection */
low = 0;
high = 1 << CELT_ALLOC_STEPS;
for (i = 0; i < CELT_ALLOC_STEPS; i++) {
int center = (low + high) >> 1;
done = total = 0;
for (j = s->endband - 1; j >= s->startband; j--) {
bandbits = bits1[j] + (center * bits2[j] >> CELT_ALLOC_STEPS);
if (bandbits >= threshold[j] || done) {
done = 1;
total += FFMIN(bandbits, cap[j]);
} else if (bandbits >= s->coded_channels << 3)
total += s->coded_channels << 3;
}
if (total > totalbits)
high = center;
else
low = center;
}
done = total = 0;
for (i = s->endband - 1; i >= s->startband; i--) {
bandbits = bits1[i] + (low * bits2[i] >> CELT_ALLOC_STEPS);
if (bandbits >= threshold[i] || done)
done = 1;
else
bandbits = (bandbits >= s->coded_channels << 3) ?
s->coded_channels << 3 : 0;
bandbits = FFMIN(bandbits, cap[i]);
s->pulses[i] = bandbits;
total += bandbits;
}
/* band skipping */
for (s->codedbands = s->endband; ; s->codedbands--) {
int allocation;
j = s->codedbands - 1;
if (j == skip_startband) {
/* all remaining bands are not skipped */
totalbits += skip_bit;
break;
}
/* determine the number of bits available for coding "do not skip" markers */
remaining = totalbits - total;
bandbits = remaining / (celt_freq_bands[j+1] - celt_freq_bands[s->startband]);
remaining -= bandbits * (celt_freq_bands[j+1] - celt_freq_bands[s->startband]);
allocation = s->pulses[j] + bandbits * celt_freq_range[j]
+ FFMAX(0, remaining - (celt_freq_bands[j] - celt_freq_bands[s->startband]));
/* a "do not skip" marker is only coded if the allocation is
above the chosen threshold */
if (allocation >= FFMAX(threshold[j], (s->coded_channels + 1) <<3 )) {
if (opus_rc_p2model(rc, 1))
break;
total += 1 << 3;
allocation -= 1 << 3;
}
/* the band is skipped, so reclaim its bits */
total -= s->pulses[j];
if (intensitystereo_bit) {
total -= intensitystereo_bit;
intensitystereo_bit = celt_log2_frac[j - s->startband];
total += intensitystereo_bit;
}
total += s->pulses[j] = (allocation >= s->coded_channels << 3) ?
s->coded_channels << 3 : 0;
}
/* obtain stereo flags */
s->intensitystereo = 0;
s->dualstereo = 0;
if (intensitystereo_bit)
s->intensitystereo = s->startband +
opus_rc_unimodel(rc, s->codedbands + 1 - s->startband);
if (s->intensitystereo <= s->startband)
totalbits += dualstereo_bit; /* no intensity stereo means no dual stereo */
else if (dualstereo_bit)
s->dualstereo = opus_rc_p2model(rc, 1);
/* supply the remaining bits in this frame to lower bands */
remaining = totalbits - total;
bandbits = remaining / (celt_freq_bands[s->codedbands] - celt_freq_bands[s->startband]);
remaining -= bandbits * (celt_freq_bands[s->codedbands] - celt_freq_bands[s->startband]);
for (i = s->startband; i < s->codedbands; i++) {
int bits = FFMIN(remaining, celt_freq_range[i]);
s->pulses[i] += bits + bandbits * celt_freq_range[i];
remaining -= bits;
}
for (i = s->startband; i < s->codedbands; i++) {
int N = celt_freq_range[i] << s->duration;
int prev_extra = extrabits;
s->pulses[i] += extrabits;
if (N > 1) {
int dof; // degrees of freedom
int temp; // dof * channels * log(dof)
int offset; // fine energy quantization offset, i.e.
// extra bits assigned over the standard
// totalbits/dof
int fine_bits, max_bits;
extrabits = FFMAX(0, s->pulses[i] - cap[i]);
s->pulses[i] -= extrabits;
/* intensity stereo makes use of an extra degree of freedom */
dof = N * s->coded_channels
+ (s->coded_channels == 2 && N > 2 && !s->dualstereo && i < s->intensitystereo);
temp = dof * (celt_log_freq_range[i] + (s->duration<<3));
offset = (temp >> 1) - dof * CELT_FINE_OFFSET;
if (N == 2) /* dof=2 is the only case that doesn't fit the model */
offset += dof<<1;
/* grant an additional bias for the first and second pulses */
if (s->pulses[i] + offset < 2 * (dof << 3))
offset += temp >> 2;
else if (s->pulses[i] + offset < 3 * (dof << 3))
offset += temp >> 3;
fine_bits = (s->pulses[i] + offset + (dof << 2)) / (dof << 3);
max_bits = FFMIN((s->pulses[i]>>3) >> (s->coded_channels - 1),
CELT_MAX_FINE_BITS);
max_bits = FFMAX(max_bits, 0);
s->fine_bits[i] = av_clip(fine_bits, 0, max_bits);
/* if fine_bits was rounded down or capped,
give priority for the final fine energy pass */
s->fine_priority[i] = (s->fine_bits[i] * (dof<<3) >= s->pulses[i] + offset);
/* the remaining bits are assigned to PVQ */
s->pulses[i] -= s->fine_bits[i] << (s->coded_channels - 1) << 3;
} else {
/* all bits go to fine energy except for the sign bit */
extrabits = FFMAX(0, s->pulses[i] - (s->coded_channels << 3));
s->pulses[i] -= extrabits;
s->fine_bits[i] = 0;
s->fine_priority[i] = 1;
}
/* hand back a limited number of extra fine energy bits to this band */
if (extrabits > 0) {
int fineextra = FFMIN(extrabits >> (s->coded_channels + 2),
CELT_MAX_FINE_BITS - s->fine_bits[i]);
s->fine_bits[i] += fineextra;
fineextra <<= s->coded_channels + 2;
s->fine_priority[i] = (fineextra >= extrabits - prev_extra);
extrabits -= fineextra;
}
}
s->remaining = extrabits;
/* skipped bands dedicate all of their bits for fine energy */
for (; i < s->endband; i++) {
s->fine_bits[i] = s->pulses[i] >> (s->coded_channels - 1) >> 3;
s->pulses[i] = 0;
s->fine_priority[i] = s->fine_bits[i] < 1;
}
}
static inline int celt_bits2pulses(const uint8_t *cache, int bits)
{
// TODO: Find the size of cache and make it into an array in the parameters list
int i, low = 0, high;
high = cache[0];
bits--;
for (i = 0; i < 6; i++) {
int center = (low + high + 1) >> 1;
if (cache[center] >= bits)
high = center;
else
low = center;
}
return (bits - (low == 0 ? -1 : cache[low]) <= cache[high] - bits) ? low : high;
}
static inline int celt_pulses2bits(const uint8_t *cache, int pulses)
{
// TODO: Find the size of cache and make it into an array in the parameters list
return (pulses == 0) ? 0 : cache[pulses] + 1;
}
static inline void celt_normalize_residual(const int * restrict iy, float * restrict X,
int N, float g)
{
int i;
for (i = 0; i < N; i++)
X[i] = g * iy[i];
}
static void celt_exp_rotation1(float *X, unsigned int len, unsigned int stride,
float c, float s)
{
float *Xptr;
int i;
Xptr = X;
for (i = 0; i < len - stride; i++) {
float x1, x2;
x1 = Xptr[0];
x2 = Xptr[stride];
Xptr[stride] = c * x2 + s * x1;
*Xptr++ = c * x1 - s * x2;
}
Xptr = &X[len - 2 * stride - 1];
for (i = len - 2 * stride - 1; i >= 0; i--) {
float x1, x2;
x1 = Xptr[0];
x2 = Xptr[stride];
Xptr[stride] = c * x2 + s * x1;
*Xptr-- = c * x1 - s * x2;
}
}
static inline void celt_exp_rotation(float *X, unsigned int len,
unsigned int stride, unsigned int K,
enum CeltSpread spread)
{
unsigned int stride2 = 0;
float c, s;
float gain, theta;
int i;
if (2*K >= len || spread == CELT_SPREAD_NONE)
return;
gain = (float)len / (len + (20 - 5*spread) * K);
theta = M_PI * gain * gain / 4;
c = cos(theta);
s = sin(theta);
if (len >= stride << 3) {
stride2 = 1;
/* This is just a simple (equivalent) way of computing sqrt(len/stride) with rounding.
It's basically incrementing long as (stride2+0.5)^2 < len/stride. */
while ((stride2 * stride2 + stride2) * stride + (stride >> 2) < len)
stride2++;
}
/*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for
extract_collapse_mask().*/
len /= stride;
for (i = 0; i < stride; i++) {
if (stride2)
celt_exp_rotation1(X + i * len, len, stride2, s, c);
celt_exp_rotation1(X + i * len, len, 1, c, s);
}
}
static inline unsigned int celt_extract_collapse_mask(const int *iy,
unsigned int N,
unsigned int B)
{
unsigned int collapse_mask;
int N0;
int i, j;
if (B <= 1)
return 1;
/*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for
exp_rotation().*/
N0 = N/B;
collapse_mask = 0;
for (i = 0; i < B; i++)
for (j = 0; j < N0; j++)
collapse_mask |= (iy[i*N0+j]!=0)<<i;
return collapse_mask;
}
static inline void celt_renormalize_vector(float *X, int N, float gain)
{
int i;
float g = 1e-15f;
for (i = 0; i < N; i++)
g += X[i] * X[i];
g = gain / sqrtf(g);
for (i = 0; i < N; i++)
X[i] *= g;
}
static inline void celt_stereo_merge(float *X, float *Y, float mid, int N)
{
int i;
float xp = 0, side = 0;
float E[2];
float mid2;
float t, gain[2];
/* Compute the norm of X+Y and X-Y as |X|^2 + |Y|^2 +/- sum(xy) */
for (i = 0; i < N; i++) {
xp += X[i] * Y[i];
side += Y[i] * Y[i];
}
/* Compensating for the mid normalization */
xp *= mid;
mid2 = mid;
E[0] = mid2 * mid2 + side - 2 * xp;
E[1] = mid2 * mid2 + side + 2 * xp;
if (E[0] < 6e-4f || E[1] < 6e-4f) {
for (i = 0; i < N; i++)
Y[i] = X[i];
return;
}
t = E[0];
gain[0] = 1.0f / sqrtf(t);
t = E[1];
gain[1] = 1.0f / sqrtf(t);
for (i = 0; i < N; i++) {
float value[2];
/* Apply mid scaling (side is already scaled) */
value[0] = mid * X[i];
value[1] = Y[i];
X[i] = gain[0] * (value[0] - value[1]);
Y[i] = gain[1] * (value[0] + value[1]);
}
}
static void celt_interleave_hadamard(float *tmp, float *X, int N0,
int stride, int hadamard)
{
int i, j;
int N = N0*stride;
if (hadamard) {
const uint8_t *ordery = celt_hadamard_ordery + stride - 2;
for (i = 0; i < stride; i++)
for (j = 0; j < N0; j++)
tmp[j*stride+i] = X[ordery[i]*N0+j];
} else {
for (i = 0; i < stride; i++)
for (j = 0; j < N0; j++)
tmp[j*stride+i] = X[i*N0+j];
}
for (i = 0; i < N; i++)
X[i] = tmp[i];
}
static void celt_deinterleave_hadamard(float *tmp, float *X, int N0,
int stride, int hadamard)
{
int i, j;
int N = N0*stride;
if (hadamard) {
const uint8_t *ordery = celt_hadamard_ordery + stride - 2;
for (i = 0; i < stride; i++)
for (j = 0; j < N0; j++)
tmp[ordery[i]*N0+j] = X[j*stride+i];
} else {
for (i = 0; i < stride; i++)
for (j = 0; j < N0; j++)
tmp[i*N0+j] = X[j*stride+i];
}
for (i = 0; i < N; i++)
X[i] = tmp[i];
}
static void celt_haar1(float *X, int N0, int stride)
{
int i, j;
N0 >>= 1;
for (i = 0; i < stride; i++) {
for (j = 0; j < N0; j++) {
float x0 = X[stride * (2 * j + 0) + i];
float x1 = X[stride * (2 * j + 1) + i];
X[stride * (2 * j + 0) + i] = (x0 + x1) * M_SQRT1_2;
X[stride * (2 * j + 1) + i] = (x0 - x1) * M_SQRT1_2;
}
}
}
static inline int celt_compute_qn(int N, int b, int offset, int pulse_cap,
int dualstereo)
{
int qn, qb;
int N2 = 2 * N - 1;
if (dualstereo && N == 2)
N2--;
/* The upper limit ensures that in a stereo split with itheta==16384, we'll
* always have enough bits left over to code at least one pulse in the
* side; otherwise it would collapse, since it doesn't get folded. */
qb = FFMIN3(b - pulse_cap - (4 << 3), (b + N2 * offset) / N2, 8 << 3);
qn = (qb < (1 << 3 >> 1)) ? 1 : ((celt_qn_exp2[qb & 0x7] >> (14 - (qb >> 3))) + 1) >> 1 << 1;
return qn;
}
// this code was adapted from libopus
static inline uint64_t celt_cwrsi(unsigned int N, unsigned int K, unsigned int i, int *y)
{
uint64_t norm = 0;
uint32_t p;
int s, val;
int k0;
while (N > 2) {
uint32_t q;
/*Lots of pulses case:*/
if (K >= N) {
const uint32_t *row = celt_pvq_u_row[N];
/* Are the pulses in this dimension negative? */
p = row[K + 1];
s = -(i >= p);
i -= p & s;
/*Count how many pulses were placed in this dimension.*/
k0 = K;
q = row[N];
if (q > i) {
K = N;
do {
p = celt_pvq_u_row[--K][N];
} while (p > i);
} else
for (p = row[K]; p > i; p = row[K])
K--;
i -= p;
val = (k0 - K + s) ^ s;
norm += val * val;
*y++ = val;
} else { /*Lots of dimensions case:*/
/*Are there any pulses in this dimension at all?*/
p = celt_pvq_u_row[K ][N];
q = celt_pvq_u_row[K + 1][N];
if (p <= i && i < q) {
i -= p;
*y++ = 0;
} else {
/*Are the pulses in this dimension negative?*/
s = -(i >= q);
i -= q & s;
/*Count how many pulses were placed in this dimension.*/
k0 = K;
do p = celt_pvq_u_row[--K][N];
while (p > i);
i -= p;
val = (k0 - K + s) ^ s;
norm += val * val;
*y++ = val;
}
}
N--;
}
/* N == 2 */
p = 2 * K + 1;
s = -(i >= p);
i -= p & s;
k0 = K;
K = (i + 1) / 2;
if (K)
i -= 2 * K - 1;
val = (k0 - K + s) ^ s;
norm += val * val;
*y++ = val;
/* N==1 */
s = -i;
val = (K + s) ^ s;
norm += val * val;
*y = val;
return norm;
}
static inline float celt_decode_pulses(OpusRangeCoder *rc, int *y, unsigned int N, unsigned int K)
{
unsigned int idx;
#define CELT_PVQ_U(n, k) (celt_pvq_u_row[FFMIN(n, k)][FFMAX(n, k)])
#define CELT_PVQ_V(n, k) (CELT_PVQ_U(n, k) + CELT_PVQ_U(n, k + 1))
idx = opus_rc_unimodel(rc, CELT_PVQ_V(N, K));
return celt_cwrsi(N, K, idx, y);
}
/** Decode pulse vector and combine the result with the pitch vector to produce
the final normalised signal in the current band. */
static inline unsigned int celt_alg_unquant(OpusRangeCoder *rc, float *X,
unsigned int N, unsigned int K,
enum CeltSpread spread,
unsigned int blocks, float gain)
{
int y[176];
gain /= sqrtf(celt_decode_pulses(rc, y, N, K));
celt_normalize_residual(y, X, N, gain);
celt_exp_rotation(X, N, blocks, K, spread);
return celt_extract_collapse_mask(y, N, blocks);
}
static unsigned int celt_decode_band(CeltContext *s, OpusRangeCoder *rc,
const int band, float *X, float *Y,
int N, int b, unsigned int blocks,
float *lowband, int duration,
float *lowband_out, int level,
float gain, float *lowband_scratch,
int fill)
{
const uint8_t *cache;
int dualstereo, split;
int imid = 0, iside = 0;
unsigned int N0 = N;
int N_B;
int N_B0;
int B0 = blocks;
int time_divide = 0;
int recombine = 0;
int inv = 0;
float mid = 0, side = 0;
int longblocks = (B0 == 1);
unsigned int cm = 0;
N_B0 = N_B = N / blocks;
split = dualstereo = (Y != NULL);
if (N == 1) {
/* special case for one sample */
int i;
float *x = X;
for (i = 0; i <= dualstereo; i++) {
int sign = 0;
if (s->remaining2 >= 1<<3) {
sign = opus_getrawbits(rc, 1);
s->remaining2 -= 1 << 3;
b -= 1 << 3;
}
x[0] = sign ? -1.0f : 1.0f;
x = Y;
}
if (lowband_out)
lowband_out[0] = X[0];
return 1;
}
if (!dualstereo && level == 0) {
int tf_change = s->tf_change[band];
int k;
if (tf_change > 0)
recombine = tf_change;
/* Band recombining to increase frequency resolution */
if (lowband &&
(recombine || ((N_B & 1) == 0 && tf_change < 0) || B0 > 1)) {
int j;
for (j = 0; j < N; j++)
lowband_scratch[j] = lowband[j];
lowband = lowband_scratch;
}
for (k = 0; k < recombine; k++) {
if (lowband)
celt_haar1(lowband, N >> k, 1 << k);
fill = celt_bit_interleave[fill & 0xF] | celt_bit_interleave[fill >> 4] << 2;
}
blocks >>= recombine;
N_B <<= recombine;
/* Increasing the time resolution */
while ((N_B & 1) == 0 && tf_change < 0) {
if (lowband)
celt_haar1(lowband, N_B, blocks);
fill |= fill << blocks;
blocks <<= 1;
N_B >>= 1;
time_divide++;
tf_change++;
}
B0 = blocks;
N_B0 = N_B;
/* Reorganize the samples in time order instead of frequency order */
if (B0 > 1 && lowband)
celt_deinterleave_hadamard(s->scratch, lowband, N_B >> recombine,
B0 << recombine, longblocks);
}
/* If we need 1.5 more bit than we can produce, split the band in two. */
cache = celt_cache_bits +
celt_cache_index[(duration + 1) * CELT_MAX_BANDS + band];
if (!dualstereo && duration >= 0 && b > cache[cache[0]] + 12 && N > 2) {
N >>= 1;
Y = X + N;
split = 1;
duration -= 1;
if (blocks == 1)
fill = (fill & 1) | (fill << 1);
blocks = (blocks + 1) >> 1;
}
if (split) {
int qn;
int itheta = 0;
int mbits, sbits, delta;
int qalloc;
int pulse_cap;
int offset;
int orig_fill;
int tell;
/* Decide on the resolution to give to the split parameter theta */
pulse_cap = celt_log_freq_range[band] + duration * 8;
offset = (pulse_cap >> 1) - (dualstereo && N == 2 ? CELT_QTHETA_OFFSET_TWOPHASE :
CELT_QTHETA_OFFSET);
qn = (dualstereo && band >= s->intensitystereo) ? 1 :
celt_compute_qn(N, b, offset, pulse_cap, dualstereo);
tell = opus_rc_tell_frac(rc);
if (qn != 1) {
/* Entropy coding of the angle. We use a uniform pdf for the
time split, a step for stereo, and a triangular one for the rest. */
if (dualstereo && N > 2)
itheta = opus_rc_stepmodel(rc, qn/2);
else if (dualstereo || B0 > 1)
itheta = opus_rc_unimodel(rc, qn+1);
else
itheta = opus_rc_trimodel(rc, qn);
itheta = itheta * 16384 / qn;
/* NOTE: Renormalising X and Y *may* help fixed-point a bit at very high rate.
Let's do that at higher complexity */
} else if (dualstereo) {
inv = (b > 2 << 3 && s->remaining2 > 2 << 3) ? opus_rc_p2model(rc, 2) : 0;
itheta = 0;
}
qalloc = opus_rc_tell_frac(rc) - tell;
b -= qalloc;
orig_fill = fill;
if (itheta == 0) {
imid = 32767;
iside = 0;
fill &= (1 << blocks) - 1;
delta = -16384;
} else if (itheta == 16384) {
imid = 0;
iside = 32767;
fill &= ((1 << blocks) - 1) << blocks;
delta = 16384;
} else {
imid = celt_cos(itheta);
iside = celt_cos(16384-itheta);
/* This is the mid vs side allocation that minimizes squared error
in that band. */
delta = ROUND_MUL16((N - 1) << 7, celt_log2tan(iside, imid));
}
mid = imid / 32768.0f;
side = iside / 32768.0f;
/* This is a special case for N=2 that only works for stereo and takes
advantage of the fact that mid and side are orthogonal to encode
the side with just one bit. */
if (N == 2 && dualstereo) {
int c;
int sign = 0;
float tmp;
float *x2, *y2;
mbits = b;
/* Only need one bit for the side */
sbits = (itheta != 0 && itheta != 16384) ? 1 << 3 : 0;
mbits -= sbits;
c = (itheta > 8192);
s->remaining2 -= qalloc+sbits;
x2 = c ? Y : X;
y2 = c ? X : Y;
if (sbits)
sign = opus_getrawbits(rc, 1);
sign = 1 - 2 * sign;
/* We use orig_fill here because we want to fold the side, but if
itheta==16384, we'll have cleared the low bits of fill. */
cm = celt_decode_band(s, rc, band, x2, NULL, N, mbits, blocks,
lowband, duration, lowband_out, level, gain,
lowband_scratch, orig_fill);
/* We don't split N=2 bands, so cm is either 1 or 0 (for a fold-collapse),
and there's no need to worry about mixing with the other channel. */
y2[0] = -sign * x2[1];
y2[1] = sign * x2[0];
X[0] *= mid;
X[1] *= mid;
Y[0] *= side;
Y[1] *= side;
tmp = X[0];
X[0] = tmp - Y[0];
Y[0] = tmp + Y[0];
tmp = X[1];
X[1] = tmp - Y[1];
Y[1] = tmp + Y[1];
} else {
/* "Normal" split code */
float *next_lowband2 = NULL;
float *next_lowband_out1 = NULL;
int next_level = 0;
int rebalance;
/* Give more bits to low-energy MDCTs than they would
* otherwise deserve */
if (B0 > 1 && !dualstereo && (itheta & 0x3fff)) {
if (itheta > 8192)
/* Rough approximation for pre-echo masking */
delta -= delta >> (4 - duration);
else
/* Corresponds to a forward-masking slope of
* 1.5 dB per 10 ms */
delta = FFMIN(0, delta + (N << 3 >> (5 - duration)));
}
mbits = av_clip((b - delta) / 2, 0, b);
sbits = b - mbits;
s->remaining2 -= qalloc;
if (lowband && !dualstereo)
next_lowband2 = lowband + N; /* >32-bit split case */
/* Only stereo needs to pass on lowband_out.
* Otherwise, it's handled at the end */
if (dualstereo)
next_lowband_out1 = lowband_out;
else
next_level = level + 1;
rebalance = s->remaining2;
if (mbits >= sbits) {
/* In stereo mode, we do not apply a scaling to the mid
* because we need the normalized mid for folding later */
cm = celt_decode_band(s, rc, band, X, NULL, N, mbits, blocks,
lowband, duration, next_lowband_out1,
next_level, dualstereo ? 1.0f : (gain * mid),
lowband_scratch, fill);
rebalance = mbits - (rebalance - s->remaining2);
if (rebalance > 3 << 3 && itheta != 0)
sbits += rebalance - (3 << 3);
/* For a stereo split, the high bits of fill are always zero,
* so no folding will be done to the side. */
cm |= celt_decode_band(s, rc, band, Y, NULL, N, sbits, blocks,
next_lowband2, duration, NULL,
next_level, gain * side, NULL,
fill >> blocks) << ((B0 >> 1) & (dualstereo - 1));
} else {
/* For a stereo split, the high bits of fill are always zero,
* so no folding will be done to the side. */
cm = celt_decode_band(s, rc, band, Y, NULL, N, sbits, blocks,
next_lowband2, duration, NULL,
next_level, gain * side, NULL,
fill >> blocks) << ((B0 >> 1) & (dualstereo - 1));
rebalance = sbits - (rebalance - s->remaining2);
if (rebalance > 3 << 3 && itheta != 16384)
mbits += rebalance - (3 << 3);
/* In stereo mode, we do not apply a scaling to the mid because
* we need the normalized mid for folding later */
cm |= celt_decode_band(s, rc, band, X, NULL, N, mbits, blocks,
lowband, duration, next_lowband_out1,
next_level, dualstereo ? 1.0f : (gain * mid),
lowband_scratch, fill);
}
}
} else {
/* This is the basic no-split case */
unsigned int q = celt_bits2pulses(cache, b);
unsigned int curr_bits = celt_pulses2bits(cache, q);
s->remaining2 -= curr_bits;
/* Ensures we can never bust the budget */
while (s->remaining2 < 0 && q > 0) {
s->remaining2 += curr_bits;
curr_bits = celt_pulses2bits(cache, --q);
s->remaining2 -= curr_bits;
}
if (q != 0) {
/* Finally do the actual quantization */
cm = celt_alg_unquant(rc, X, N, (q < 8) ? q : (8 + (q & 7)) << ((q >> 3) - 1),
s->spread, blocks, gain);
} else {
/* If there's no pulse, fill the band anyway */
int j;
unsigned int cm_mask = (1 << blocks) - 1;
fill &= cm_mask;
if (!fill) {
for (j = 0; j < N; j++)
X[j] = 0.0f;
} else {
if (lowband == NULL) {
/* Noise */
for (j = 0; j < N; j++)
X[j] = (((int32_t)celt_rng(s)) >> 20);
cm = cm_mask;
} else {
/* Folded spectrum */
for (j = 0; j < N; j++) {
/* About 48 dB below the "normal" folding level */
X[j] = lowband[j] + (((celt_rng(s)) & 0x8000) ? 1.0f / 256 : -1.0f / 256);
}
cm = fill;
}
celt_renormalize_vector(X, N, gain);
}
}
}
/* This code is used by the decoder and by the resynthesis-enabled encoder */
if (dualstereo) {
int j;
if (N != 2)
celt_stereo_merge(X, Y, mid, N);
if (inv) {
for (j = 0; j < N; j++)
Y[j] *= -1;
}
} else if (level == 0) {
int k;
/* Undo the sample reorganization going from time order to frequency order */
if (B0 > 1)
celt_interleave_hadamard(s->scratch, X, N_B>>recombine,
B0<<recombine, longblocks);
/* Undo time-freq changes that we did earlier */
N_B = N_B0;
blocks = B0;
for (k = 0; k < time_divide; k++) {
blocks >>= 1;
N_B <<= 1;
cm |= cm >> blocks;
celt_haar1(X, N_B, blocks);
}
for (k = 0; k < recombine; k++) {
cm = celt_bit_deinterleave[cm];
celt_haar1(X, N0>>k, 1<<k);
}
blocks <<= recombine;
/* Scale output for later folding */
if (lowband_out) {
int j;
float n = sqrtf(N0);
for (j = 0; j < N0; j++)
lowband_out[j] = n * X[j];
}
cm &= (1 << blocks) - 1;
}
return cm;
}
static void celt_denormalize(CeltContext *s, CeltFrame *frame, float *data)
{
int i, j;
for (i = s->startband; i < s->endband; i++) {
float *dst = data + (celt_freq_bands[i] << s->duration);
float norm = pow(2, frame->energy[i] + celt_mean_energy[i]);
for (j = 0; j < celt_freq_range[i] << s->duration; j++)
dst[j] *= norm;
}
}
static void celt_postfilter_apply_transition(CeltFrame *frame, float *data)
{
const int T0 = frame->pf_period_old;
const int T1 = frame->pf_period;
float g00, g01, g02;
float g10, g11, g12;
float x0, x1, x2, x3, x4;
int i;
if (frame->pf_gains[0] == 0.0 &&
frame->pf_gains_old[0] == 0.0)
return;
g00 = frame->pf_gains_old[0];
g01 = frame->pf_gains_old[1];
g02 = frame->pf_gains_old[2];
g10 = frame->pf_gains[0];
g11 = frame->pf_gains[1];
g12 = frame->pf_gains[2];
x1 = data[-T1 + 1];
x2 = data[-T1];
x3 = data[-T1 - 1];
x4 = data[-T1 - 2];
for (i = 0; i < CELT_OVERLAP; i++) {
float w = ff_celt_window2[i];
x0 = data[i - T1 + 2];
data[i] += (1.0 - w) * g00 * data[i - T0] +
(1.0 - w) * g01 * (data[i - T0 - 1] + data[i - T0 + 1]) +
(1.0 - w) * g02 * (data[i - T0 - 2] + data[i - T0 + 2]) +
w * g10 * x2 +
w * g11 * (x1 + x3) +
w * g12 * (x0 + x4);
x4 = x3;
x3 = x2;
x2 = x1;
x1 = x0;
}
}
static void celt_postfilter_apply(CeltFrame *frame,
float *data, int len)
{
const int T = frame->pf_period;
float g0, g1, g2;
float x0, x1, x2, x3, x4;
int i;
if (frame->pf_gains[0] == 0.0 || len <= 0)
return;
g0 = frame->pf_gains[0];
g1 = frame->pf_gains[1];
g2 = frame->pf_gains[2];
x4 = data[-T - 2];
x3 = data[-T - 1];
x2 = data[-T];
x1 = data[-T + 1];
for (i = 0; i < len; i++) {
x0 = data[i - T + 2];
data[i] += g0 * x2 +
g1 * (x1 + x3) +
g2 * (x0 + x4);
x4 = x3;
x3 = x2;
x2 = x1;
x1 = x0;
}
}
static void celt_postfilter(CeltContext *s, CeltFrame *frame)
{
int len = s->blocksize * s->blocks;
celt_postfilter_apply_transition(frame, frame->buf + 1024);
frame->pf_period_old = frame->pf_period;
memcpy(frame->pf_gains_old, frame->pf_gains, sizeof(frame->pf_gains));
frame->pf_period = frame->pf_period_new;
memcpy(frame->pf_gains, frame->pf_gains_new, sizeof(frame->pf_gains));
if (len > CELT_OVERLAP) {
celt_postfilter_apply_transition(frame, frame->buf + 1024 + CELT_OVERLAP);
celt_postfilter_apply(frame, frame->buf + 1024 + 2 * CELT_OVERLAP,
len - 2 * CELT_OVERLAP);
frame->pf_period_old = frame->pf_period;
memcpy(frame->pf_gains_old, frame->pf_gains, sizeof(frame->pf_gains));
}
memmove(frame->buf, frame->buf + len, (1024 + CELT_OVERLAP / 2) * sizeof(float));
}
static int parse_postfilter(CeltContext *s, OpusRangeCoder *rc, int consumed)
{
static const float postfilter_taps[3][3] = {
{ 0.3066406250f, 0.2170410156f, 0.1296386719f },
{ 0.4638671875f, 0.2680664062f, 0.0 },
{ 0.7998046875f, 0.1000976562f, 0.0 }
};
int i;
memset(s->frame[0].pf_gains_new, 0, sizeof(s->frame[0].pf_gains_new));
memset(s->frame[1].pf_gains_new, 0, sizeof(s->frame[1].pf_gains_new));
if (s->startband == 0 && consumed + 16 <= s->framebits) {
int has_postfilter = opus_rc_p2model(rc, 1);
if (has_postfilter) {
float gain;
int tapset, octave, period;
octave = opus_rc_unimodel(rc, 6);
period = (16 << octave) + opus_getrawbits(rc, 4 + octave) - 1;
gain = 0.09375f * (opus_getrawbits(rc, 3) + 1);
tapset = (opus_rc_tell(rc) + 2 <= s->framebits) ?
opus_rc_getsymbol(rc, celt_model_tapset) : 0;
for (i = 0; i < 2; i++) {
CeltFrame *frame = &s->frame[i];
frame->pf_period_new = FFMAX(period, CELT_POSTFILTER_MINPERIOD);
frame->pf_gains_new[0] = gain * postfilter_taps[tapset][0];
frame->pf_gains_new[1] = gain * postfilter_taps[tapset][1];
frame->pf_gains_new[2] = gain * postfilter_taps[tapset][2];
}
}
consumed = opus_rc_tell(rc);
}
return consumed;
}
static void process_anticollapse(CeltContext *s, CeltFrame *frame, float *X)
{
int i, j, k;
for (i = s->startband; i < s->endband; i++) {
int renormalize = 0;
float *xptr;
float prev[2];
float Ediff, r;
float thresh, sqrt_1;
int depth;
/* depth in 1/8 bits */
depth = (1 + s->pulses[i]) / (celt_freq_range[i] << s->duration);
thresh = pow(2, -1.0 - 0.125f * depth);
sqrt_1 = 1.0f / sqrtf(celt_freq_range[i] << s->duration);
xptr = X + (celt_freq_bands[i] << s->duration);
prev[0] = frame->prev_energy[0][i];
prev[1] = frame->prev_energy[1][i];
if (s->coded_channels == 1) {
CeltFrame *frame1 = &s->frame[1];
prev[0] = FFMAX(prev[0], frame1->prev_energy[0][i]);
prev[1] = FFMAX(prev[1], frame1->prev_energy[1][i]);
}
Ediff = frame->energy[i] - FFMIN(prev[0], prev[1]);
Ediff = FFMAX(0, Ediff);
/* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because
short blocks don't have the same energy as long */
r = pow(2, 1 - Ediff);
if (s->duration == 3)
r *= M_SQRT2;
r = FFMIN(thresh, r) * sqrt_1;
for (k = 0; k < 1 << s->duration; k++) {
/* Detect collapse */
if (!(frame->collapse_masks[i] & 1 << k)) {
/* Fill with noise */
for (j = 0; j < celt_freq_range[i]; j++)
xptr[(j << s->duration) + k] = (celt_rng(s) & 0x8000) ? r : -r;
renormalize = 1;
}
}
/* We just added some energy, so we need to renormalize */
if (renormalize)
celt_renormalize_vector(xptr, celt_freq_range[i] << s->duration, 1.0f);
}
}
static void celt_decode_bands(CeltContext *s, OpusRangeCoder *rc)
{
float lowband_scratch[8 * 22];
float norm[2 * 8 * 100];
int totalbits = (s->framebits << 3) - s->anticollapse_bit;
int update_lowband = 1;
int lowband_offset = 0;
int i, j;
memset(s->coeffs, 0, sizeof(s->coeffs));
for (i = s->startband; i < s->endband; i++) {
int band_offset = celt_freq_bands[i] << s->duration;
int band_size = celt_freq_range[i] << s->duration;
float *X = s->coeffs[0] + band_offset;
float *Y = (s->coded_channels == 2) ? s->coeffs[1] + band_offset : NULL;
int consumed = opus_rc_tell_frac(rc);
float *norm2 = norm + 8 * 100;
int effective_lowband = -1;
unsigned int cm[2];
int b;
/* Compute how many bits we want to allocate to this band */
if (i != s->startband)
s->remaining -= consumed;
s->remaining2 = totalbits - consumed - 1;
if (i <= s->codedbands - 1) {
int curr_balance = s->remaining / FFMIN(3, s->codedbands-i);
b = av_clip(FFMIN(s->remaining2 + 1, s->pulses[i] + curr_balance), 0, 16383);
} else
b = 0;
if (celt_freq_bands[i] - celt_freq_range[i] >= celt_freq_bands[s->startband] &&
(update_lowband || lowband_offset == 0))
lowband_offset = i;
/* Get a conservative estimate of the collapse_mask's for the bands we're
going to be folding from. */
if (lowband_offset != 0 && (s->spread != CELT_SPREAD_AGGRESSIVE ||
s->blocks > 1 || s->tf_change[i] < 0)) {
int foldstart, foldend;
/* This ensures we never repeat spectral content within one band */
effective_lowband = FFMAX(celt_freq_bands[s->startband],
celt_freq_bands[lowband_offset] - celt_freq_range[i]);
foldstart = lowband_offset;
while (celt_freq_bands[--foldstart] > effective_lowband);
foldend = lowband_offset - 1;
while (celt_freq_bands[++foldend] < effective_lowband + celt_freq_range[i]);
cm[0] = cm[1] = 0;
for (j = foldstart; j < foldend; j++) {
cm[0] |= s->frame[0].collapse_masks[j];
cm[1] |= s->frame[s->coded_channels - 1].collapse_masks[j];
}
} else
/* Otherwise, we'll be using the LCG to fold, so all blocks will (almost
always) be non-zero.*/
cm[0] = cm[1] = (1 << s->blocks) - 1;
if (s->dualstereo && i == s->intensitystereo) {
/* Switch off dual stereo to do intensity */
s->dualstereo = 0;
for (j = celt_freq_bands[s->startband] << s->duration; j < band_offset; j++)
norm[j] = (norm[j] + norm2[j]) / 2;
}
if (s->dualstereo) {
cm[0] = celt_decode_band(s, rc, i, X, NULL, band_size, b / 2, s->blocks,
effective_lowband != -1 ? norm + (effective_lowband << s->duration) : NULL, s->duration,
norm + band_offset, 0, 1.0f, lowband_scratch, cm[0]);
cm[1] = celt_decode_band(s, rc, i, Y, NULL, band_size, b/2, s->blocks,
effective_lowband != -1 ? norm2 + (effective_lowband << s->duration) : NULL, s->duration,
norm2 + band_offset, 0, 1.0f, lowband_scratch, cm[1]);
} else {
cm[0] = celt_decode_band(s, rc, i, X, Y, band_size, b, s->blocks,
effective_lowband != -1 ? norm + (effective_lowband << s->duration) : NULL, s->duration,
norm + band_offset, 0, 1.0f, lowband_scratch, cm[0]|cm[1]);
cm[1] = cm[0];
}
s->frame[0].collapse_masks[i] = (uint8_t)cm[0];
s->frame[s->coded_channels - 1].collapse_masks[i] = (uint8_t)cm[1];
s->remaining += s->pulses[i] + consumed;
/* Update the folding position only as long as we have 1 bit/sample depth */
update_lowband = (b > band_size << 3);
}
}
int ff_celt_decode_frame(CeltContext *s, OpusRangeCoder *rc,
float **output, int coded_channels, int frame_size,
int startband, int endband)
{
int i, j;
int consumed; // bits of entropy consumed thus far for this frame
int silence = 0;
int transient = 0;
int anticollapse = 0;
CeltIMDCTContext *imdct;
float imdct_scale = 1.0;
if (coded_channels != 1 && coded_channels != 2) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid number of coded channels: %d\n",
coded_channels);
return AVERROR_INVALIDDATA;
}
if (startband < 0 || startband > endband || endband > CELT_MAX_BANDS) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid start/end band: %d %d\n",
startband, endband);
return AVERROR_INVALIDDATA;
}
s->flushed = 0;
s->coded_channels = coded_channels;
s->startband = startband;
s->endband = endband;
s->framebits = rc->rb.bytes * 8;
s->duration = av_log2(frame_size / CELT_SHORT_BLOCKSIZE);
if (s->duration > CELT_MAX_LOG_BLOCKS ||
frame_size != CELT_SHORT_BLOCKSIZE * (1 << s->duration)) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid CELT frame size: %d\n",
frame_size);
return AVERROR_INVALIDDATA;
}
if (!s->output_channels)
s->output_channels = coded_channels;
memset(s->frame[0].collapse_masks, 0, sizeof(s->frame[0].collapse_masks));
memset(s->frame[1].collapse_masks, 0, sizeof(s->frame[1].collapse_masks));
consumed = opus_rc_tell(rc);
/* obtain silence flag */
if (consumed >= s->framebits)
silence = 1;
else if (consumed == 1)
silence = opus_rc_p2model(rc, 15);
if (silence) {
consumed = s->framebits;
rc->total_read_bits += s->framebits - opus_rc_tell(rc);
}
/* obtain post-filter options */
consumed = parse_postfilter(s, rc, consumed);
/* obtain transient flag */
if (s->duration != 0 && consumed+3 <= s->framebits)
transient = opus_rc_p2model(rc, 3);
s->blocks = transient ? 1 << s->duration : 1;
s->blocksize = frame_size / s->blocks;
imdct = s->imdct[transient ? 0 : s->duration];
if (coded_channels == 1) {
for (i = 0; i < CELT_MAX_BANDS; i++)
s->frame[0].energy[i] = FFMAX(s->frame[0].energy[i], s->frame[1].energy[i]);
}
celt_decode_coarse_energy(s, rc);
celt_decode_tf_changes (s, rc, transient);
celt_decode_allocation (s, rc);
celt_decode_fine_energy (s, rc);
celt_decode_bands (s, rc);
if (s->anticollapse_bit)
anticollapse = opus_getrawbits(rc, 1);
celt_decode_final_energy(s, rc, s->framebits - opus_rc_tell(rc));
/* apply anti-collapse processing and denormalization to
* each coded channel */
for (i = 0; i < s->coded_channels; i++) {
CeltFrame *frame = &s->frame[i];
if (anticollapse)
process_anticollapse(s, frame, s->coeffs[i]);
celt_denormalize(s, frame, s->coeffs[i]);
}
/* stereo -> mono downmix */
if (s->output_channels < s->coded_channels) {
s->dsp.vector_fmac_scalar(s->coeffs[0], s->coeffs[1], 1.0, FFALIGN(frame_size, 16));
imdct_scale = 0.5;
} else if (s->output_channels > s->coded_channels)
memcpy(s->coeffs[1], s->coeffs[0], frame_size * sizeof(float));
if (silence) {
for (i = 0; i < 2; i++) {
CeltFrame *frame = &s->frame[i];
for (j = 0; j < FF_ARRAY_ELEMS(frame->energy); j++)
frame->energy[j] = CELT_ENERGY_SILENCE;
}
memset(s->coeffs, 0, sizeof(s->coeffs));
}
/* transform and output for each output channel */
for (i = 0; i < s->output_channels; i++) {
CeltFrame *frame = &s->frame[i];
float m = frame->deemph_coeff;
/* iMDCT and overlap-add */
for (j = 0; j < s->blocks; j++) {
float *dst = frame->buf + 1024 + j * s->blocksize;
ff_celt_imdct_half(imdct, dst + CELT_OVERLAP / 2, s->coeffs[i] + j,
s->blocks, imdct_scale);
s->dsp.vector_fmul_window(dst, dst, dst + CELT_OVERLAP / 2,
celt_window, CELT_OVERLAP / 2);
}
/* postfilter */
celt_postfilter(s, frame);
/* deemphasis and output scaling */
for (j = 0; j < frame_size; j++) {
float tmp = frame->buf[1024 - frame_size + j] + m;
m = tmp * CELT_DEEMPH_COEFF;
output[i][j] = tmp / 32768.;
}
frame->deemph_coeff = m;
}
if (coded_channels == 1)
memcpy(s->frame[1].energy, s->frame[0].energy, sizeof(s->frame[0].energy));
for (i = 0; i < 2; i++ ) {
CeltFrame *frame = &s->frame[i];
if (!transient) {
memcpy(frame->prev_energy[1], frame->prev_energy[0], sizeof(frame->prev_energy[0]));
memcpy(frame->prev_energy[0], frame->energy, sizeof(frame->prev_energy[0]));
} else {
for (j = 0; j < CELT_MAX_BANDS; j++)
frame->prev_energy[0][j] = FFMIN(frame->prev_energy[0][j], frame->energy[j]);
}
for (j = 0; j < s->startband; j++) {
frame->prev_energy[0][j] = CELT_ENERGY_SILENCE;
frame->energy[j] = 0.0;
}
for (j = s->endband; j < CELT_MAX_BANDS; j++) {
frame->prev_energy[0][j] = CELT_ENERGY_SILENCE;
frame->energy[j] = 0.0;
}
}
s->seed = rc->range;
return 0;
}
void ff_celt_flush(CeltContext *s)
{
int i, j;
if (s->flushed)
return;
for (i = 0; i < 2; i++) {
CeltFrame *frame = &s->frame[i];
for (j = 0; j < CELT_MAX_BANDS; j++)
frame->prev_energy[0][j] = frame->prev_energy[1][j] = CELT_ENERGY_SILENCE;
memset(frame->energy, 0, sizeof(frame->energy));
memset(frame->buf, 0, sizeof(frame->buf));
memset(frame->pf_gains, 0, sizeof(frame->pf_gains));
memset(frame->pf_gains_old, 0, sizeof(frame->pf_gains_old));
memset(frame->pf_gains_new, 0, sizeof(frame->pf_gains_new));
frame->deemph_coeff = 0.0;
}
s->seed = 0;
s->flushed = 1;
}
void ff_celt_free(CeltContext **ps)
{
CeltContext *s = *ps;
int i;
if (!s)
return;
for (i = 0; i < FF_ARRAY_ELEMS(s->imdct); i++)
ff_celt_imdct_uninit(&s->imdct[i]);
av_freep(ps);
}
int ff_celt_init(AVCodecContext *avctx, CeltContext **ps, int output_channels)
{
CeltContext *s;
int i, ret;
if (output_channels != 1 && output_channels != 2) {
av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n",
output_channels);
return AVERROR(EINVAL);
}
s = av_mallocz(sizeof(*s));
if (!s)
return AVERROR(ENOMEM);
s->avctx = avctx;
s->output_channels = output_channels;
for (i = 0; i < FF_ARRAY_ELEMS(s->imdct); i++) {
ret = ff_celt_imdct_init(&s->imdct[i], i + 3);
if (ret < 0)
goto fail;
}
avpriv_float_dsp_init(&s->dsp, avctx->flags & CODEC_FLAG_BITEXACT);
ff_celt_flush(s);
*ps = s;
return 0;
fail:
ff_celt_free(&s);
return ret;
}
libavcodec/opus_imdct.c 0 → 100644
浏览文件 @ b70d7a4a
/*
* Copyright (c) 2013-2014 Mozilla Corporation
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Celt non-power of 2 iMDCT
*/
#include <float.h>
#include <math.h>
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "fft.h"
#include "opus.h"
// complex c = a * b
#define CMUL3(cre, cim, are, aim, bre, bim) \
do { \
cre = are * bre - aim * bim; \
cim = are * bim + aim * bre; \
} while (0)
#define CMUL(c, a, b) CMUL3((c).re, (c).im, (a).re, (a).im, (b).re, (b).im)
// complex c = a * b
// d = a * conjugate(b)
#define CMUL2(c, d, a, b) \
do { \
float are = (a).re; \
float aim = (a).im; \
float bre = (b).re; \
float bim = (b).im; \
float rr = are * bre; \
float ri = are * bim; \
float ir = aim * bre; \
float ii = aim * bim; \
(c).re = rr - ii; \
(c).im = ri + ir; \
(d).re = rr + ii; \
(d).im = -ri + ir; \
} while (0)
struct CeltIMDCTContext {
int fft_n;
int len2;
int len4;
FFTComplex *tmp;
FFTComplex *twiddle_exptab;
FFTComplex *exptab[6];
};
av_cold void ff_celt_imdct_uninit(CeltIMDCTContext **ps)
{
CeltIMDCTContext *s = *ps;
int i;
if (!s)
return;
for (i = 0; i < FF_ARRAY_ELEMS(s->exptab); i++)
av_freep(&s->exptab[i]);
av_freep(&s->twiddle_exptab);
av_freep(&s->tmp);
av_freep(ps);
}
av_cold int ff_celt_imdct_init(CeltIMDCTContext **ps, int N)
{
CeltIMDCTContext *s;
int len2 = 15 * (1 << N);
int len = 2 * len2;
int i, j;
if (len2 > CELT_MAX_FRAME_SIZE)
return AVERROR(EINVAL);
s = av_mallocz(sizeof(*s));
if (!s)
return AVERROR(ENOMEM);
s->fft_n = N - 1;
s->len4 = len2 / 2;
s->len2 = len2;
s->tmp = av_malloc(len * 2 * sizeof(*s->tmp));
if (!s->tmp)
goto fail;
s->twiddle_exptab = av_malloc(s->len4 * sizeof(*s->twiddle_exptab));
if (!s->twiddle_exptab)
goto fail;
for (i = 0; i < s->len4; i++) {
s->twiddle_exptab[i].re = cos(2 * M_PI * (i + 0.125 + s->len4) / len);
s->twiddle_exptab[i].im = sin(2 * M_PI * (i + 0.125 + s->len4) / len);
}
for (i = 0; i < FF_ARRAY_ELEMS(s->exptab); i++) {
int N = 15 * (1 << i);
s->exptab[i] = av_malloc(sizeof(*s->exptab[i]) * FFMAX(N, 19));
if (!s->exptab[i])
goto fail;
for (j = 0; j < N; j++) {
s->exptab[i][j].re = cos(2 * M_PI * j / N);
s->exptab[i][j].im = sin(2 * M_PI * j / N);
}
}
// wrap around to simplify fft15
for (j = 15; j < 19; j++)
s->exptab[0][j] = s->exptab[0][j - 15];
*ps = s;
return 0;
fail:
ff_celt_imdct_uninit(&s);
return AVERROR(ENOMEM);
}
static void fft5(FFTComplex *out, const FFTComplex *in, int stride)
{
// [0] = exp(2 * i * pi / 5), [1] = exp(2 * i * pi * 2 / 5)
static const FFTComplex fact[] = { { 0.30901699437494745, 0.95105651629515353 },
{ -0.80901699437494734, 0.58778525229247325 } };
FFTComplex z[4][4];
CMUL2(z[0][0], z[0][3], in[1 * stride], fact[0]);
CMUL2(z[0][1], z[0][2], in[1 * stride], fact[1]);
CMUL2(z[1][0], z[1][3], in[2 * stride], fact[0]);
CMUL2(z[1][1], z[1][2], in[2 * stride], fact[1]);
CMUL2(z[2][0], z[2][3], in[3 * stride], fact[0]);
CMUL2(z[2][1], z[2][2], in[3 * stride], fact[1]);
CMUL2(z[3][0], z[3][3], in[4 * stride], fact[0]);
CMUL2(z[3][1], z[3][2], in[4 * stride], fact[1]);
out[0].re = in[0].re + in[stride].re + in[2 * stride].re + in[3 * stride].re + in[4 * stride].re;
out[0].im = in[0].im + in[stride].im + in[2 * stride].im + in[3 * stride].im + in[4 * stride].im;
out[1].re = in[0].re + z[0][0].re + z[1][1].re + z[2][2].re + z[3][3].re;
out[1].im = in[0].im + z[0][0].im + z[1][1].im + z[2][2].im + z[3][3].im;
out[2].re = in[0].re + z[0][1].re + z[1][3].re + z[2][0].re + z[3][2].re;
out[2].im = in[0].im + z[0][1].im + z[1][3].im + z[2][0].im + z[3][2].im;
out[3].re = in[0].re + z[0][2].re + z[1][0].re + z[2][3].re + z[3][1].re;
out[3].im = in[0].im + z[0][2].im + z[1][0].im + z[2][3].im + z[3][1].im;
out[4].re = in[0].re + z[0][3].re + z[1][2].re + z[2][1].re + z[3][0].re;
out[4].im = in[0].im + z[0][3].im + z[1][2].im + z[2][1].im + z[3][0].im;
}
static void fft15(CeltIMDCTContext *s, FFTComplex *out, const FFTComplex *in, int stride)
{
const FFTComplex *exptab = s->exptab[0];
FFTComplex tmp[5];
FFTComplex tmp1[5];
FFTComplex tmp2[5];
int k;
fft5(tmp, in, stride * 3);
fft5(tmp1, in + stride, stride * 3);
fft5(tmp2, in + 2 * stride, stride * 3);
for (k = 0; k < 5; k++) {
FFTComplex t1, t2;
CMUL(t1, tmp1[k], exptab[k]);
CMUL(t2, tmp2[k], exptab[2 * k]);
out[k].re = tmp[k].re + t1.re + t2.re;
out[k].im = tmp[k].im + t1.im + t2.im;
CMUL(t1, tmp1[k], exptab[k + 5]);
CMUL(t2, tmp2[k], exptab[2 * (k + 5)]);
out[k + 5].re = tmp[k].re + t1.re + t2.re;
out[k + 5].im = tmp[k].im + t1.im + t2.im;
CMUL(t1, tmp1[k], exptab[k + 10]);
CMUL(t2, tmp2[k], exptab[2 * k + 5]);
out[k + 10].re = tmp[k].re + t1.re + t2.re;
out[k + 10].im = tmp[k].im + t1.im + t2.im;
}
}
/*
* FFT of the length 15 * (2^N)
*/
static void fft_calc(CeltIMDCTContext *s, FFTComplex *out, const FFTComplex *in, int N, int stride)
{
if (N) {
const FFTComplex *exptab = s->exptab[N];
const int len2 = 15 * (1 << (N - 1));
int k;
fft_calc(s, out, in, N - 1, stride * 2);
fft_calc(s, out + len2, in + stride, N - 1, stride * 2);
for (k = 0; k < len2; k++) {
FFTComplex t;
CMUL(t, out[len2 + k], exptab[k]);
out[len2 + k].re = out[k].re - t.re;
out[len2 + k].im = out[k].im - t.im;
out[k].re += t.re;
out[k].im += t.im;
}
} else
fft15(s, out, in, stride);
}
void ff_celt_imdct_half(CeltIMDCTContext *s, float *dst, const float *src,
int stride, float scale)
{
FFTComplex *z = (FFTComplex *)dst;
const int len8 = s->len4 / 2;
const float *in1 = src;
const float *in2 = src + (s->len2 - 1) * stride;
int i;
for (i = 0; i < s->len4; i++) {
FFTComplex tmp = { *in2, *in1 };
CMUL(s->tmp[i], tmp, s->twiddle_exptab[i]);
in1 += 2 * stride;
in2 -= 2 * stride;
}
fft_calc(s, z, s->tmp, s->fft_n, 1);
for (i = 0; i < len8; i++) {
float r0, i0, r1, i1;
CMUL3(r0, i1, z[len8 - i - 1].im, z[len8 - i - 1].re, s->twiddle_exptab[len8 - i - 1].im, s->twiddle_exptab[len8 - i - 1].re);
CMUL3(r1, i0, z[len8 + i].im, z[len8 + i].re, s->twiddle_exptab[len8 + i].im, s->twiddle_exptab[len8 + i].re);
z[len8 - i - 1].re = scale * r0;
z[len8 - i - 1].im = scale * i0;
z[len8 + i].re = scale * r1;
z[len8 + i].im = scale * i1;
}
}
libavcodec/opus_parser.c 0 → 100644
浏览文件 @ b70d7a4a
/*
* Copyright (c) 2013-2014 Mozilla Corporation
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Opus parser
*
* Determines the duration for each packet.
*/
#include "avcodec.h"
#include "opus.h"
typedef struct OpusParseContext {
OpusContext ctx;
OpusPacket pkt;
int extradata_parsed;
} OpusParseContext;
static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
OpusParseContext *s = ctx->priv_data;
int ret;
if (!buf_size)
return 0;
if (avctx->extradata && !s->extradata_parsed) {
ret = ff_opus_parse_extradata(avctx, &s->ctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
goto fail;
}
av_freep(&s->ctx.channel_maps);
s->extradata_parsed = 1;
}
ret = ff_opus_parse_packet(&s->pkt, buf, buf_size, s->ctx.nb_streams > 1);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
goto fail;
}
ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
fail:
*poutbuf = buf;
*poutbuf_size = buf_size;
return buf_size;
}
AVCodecParser ff_opus_parser = {
.codec_ids = { AV_CODEC_ID_OPUS },
.priv_data_size = sizeof(OpusParseContext),
.parser_parse = opus_parse,
};
libavcodec/opus_silk.c 0 → 100644
浏览文件 @ b70d7a4a
/*
* Copyright (c) 2012 Andrew D'Addesio
* Copyright (c) 2013-2014 Mozilla Corporation
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Opus SILK decoder
*/
#include <stdint.h>
#include "opus.h"
typedef struct SilkFrame {
int coded;
int log_gain;
int16_t nlsf[16];
float lpc[16];
float output [2 * SILK_HISTORY];
float lpc_history[2 * SILK_HISTORY];
int primarylag;
int prev_voiced;
} SilkFrame;
struct SilkContext {
AVCodecContext *avctx;
int output_channels;
int midonly;
int subframes;
int sflength;
int flength;
int nlsf_interp_factor;
enum OpusBandwidth bandwidth;
int wb;
SilkFrame frame[2];
float prev_stereo_weights[2];
float stereo_weights[2];
int prev_coded_channels;
};
static const uint16_t silk_model_stereo_s1[] = {
256, 7, 9, 10, 11, 12, 22, 46, 54, 55, 56, 59, 82, 174, 197, 200,
201, 202, 210, 234, 244, 245, 246, 247, 249, 256
};
static const uint16_t silk_model_stereo_s2[] = {256, 85, 171, 256};
static const uint16_t silk_model_stereo_s3[] = {256, 51, 102, 154, 205, 256};
static const uint16_t silk_model_mid_only[] = {256, 192, 256};
static const uint16_t silk_model_frame_type_inactive[] = {256, 26, 256};
static const uint16_t silk_model_frame_type_active[] = {256, 24, 98, 246, 256};
static const uint16_t silk_model_gain_highbits[3][9] = {
{256, 32, 144, 212, 241, 253, 254, 255, 256},
{256, 2, 19, 64, 124, 186, 233, 252, 256},
{256, 1, 4, 30, 101, 195, 245, 254, 256}
};
static const uint16_t silk_model_gain_lowbits[] = {256, 32, 64, 96, 128, 160, 192, 224, 256};
static const uint16_t silk_model_gain_delta[] = {
256, 6, 11, 22, 53, 185, 206, 214, 218, 221, 223, 225, 227, 228, 229, 230,
231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246,
247, 248, 249, 250, 251, 252, 253, 254, 255, 256
};
static const uint16_t silk_model_lsf_s1[2][2][33] = {
{
{ // NB or MB, unvoiced
256, 44, 78, 108, 127, 148, 160, 171, 174, 177, 179, 195, 197, 199, 200, 205,
207, 208, 211, 214, 215, 216, 218, 220, 222, 225, 226, 235, 244, 246, 253, 255, 256
}, { // NB or MB, voiced
256, 1, 11, 12, 20, 23, 31, 39, 53, 66, 80, 81, 95, 107, 120, 131,
142, 154, 165, 175, 185, 196, 204, 213, 221, 228, 236, 237, 238, 244, 245, 251, 256
}
}, {
{ // WB, unvoiced
256, 31, 52, 55, 72, 73, 81, 98, 102, 103, 121, 137, 141, 143, 146, 147,
157, 158, 161, 177, 188, 204, 206, 208, 211, 213, 224, 225, 229, 238, 246, 253, 256
}, { // WB, voiced
256, 1, 5, 21, 26, 44, 55, 60, 74, 89, 90, 93, 105, 118, 132, 146,
152, 166, 178, 180, 186, 187, 199, 211, 222, 232, 235, 245, 250, 251, 252, 253, 256
}
}
};
static const uint16_t silk_model_lsf_s2[32][10] = {
// NB, MB
{ 256, 1, 2, 3, 18, 242, 253, 254, 255, 256 },
{ 256, 1, 2, 4, 38, 221, 253, 254, 255, 256 },
{ 256, 1, 2, 6, 48, 197, 252, 254, 255, 256 },
{ 256, 1, 2, 10, 62, 185, 246, 254, 255, 256 },
{ 256, 1, 4, 20, 73, 174, 248, 254, 255, 256 },
{ 256, 1, 4, 21, 76, 166, 239, 254, 255, 256 },
{ 256, 1, 8, 32, 85, 159, 226, 252, 255, 256 },
{ 256, 1, 2, 20, 83, 161, 219, 249, 255, 256 },
// WB
{ 256, 1, 2, 3, 12, 244, 253, 254, 255, 256 },
{ 256, 1, 2, 4, 32, 218, 253, 254, 255, 256 },
{ 256, 1, 2, 5, 47, 199, 252, 254, 255, 256 },
{ 256, 1, 2, 12, 61, 187, 252, 254, 255, 256 },
{ 256, 1, 5, 24, 72, 172, 249, 254, 255, 256 },
{ 256, 1, 2, 16, 70, 170, 242, 254, 255, 256 },
{ 256, 1, 2, 17, 78, 165, 226, 251, 255, 256 },
{ 256, 1, 8, 29, 79, 156, 237, 254, 255, 256 }
};
static const uint16_t silk_model_lsf_s2_ext[] = { 256, 156, 216, 240, 249, 253, 255, 256 };
static const uint16_t silk_model_lsf_interpolation_offset[] = { 256, 13, 35, 64, 75, 256 };
static const uint16_t silk_model_pitch_highbits[] = {
256, 3, 6, 12, 23, 44, 74, 106, 125, 136, 146, 158, 171, 184, 196, 207,
216, 224, 231, 237, 241, 243, 245, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256
};
static const uint16_t silk_model_pitch_lowbits_nb[]= { 256, 64, 128, 192, 256 };
static const uint16_t silk_model_pitch_lowbits_mb[]= { 256, 43, 85, 128, 171, 213, 256 };
static const uint16_t silk_model_pitch_lowbits_wb[]= { 256, 32, 64, 96, 128, 160, 192, 224, 256 };
static const uint16_t silk_model_pitch_delta[] = {
256, 46, 48, 50, 53, 57, 63, 73, 88, 114, 152, 182, 204, 219, 229, 236,
242, 246, 250, 252, 254, 256
};
static const uint16_t silk_model_pitch_contour_nb10ms[] = { 256, 143, 193, 256 };
static const uint16_t silk_model_pitch_contour_nb20ms[] = {
256, 68, 80, 101, 118, 137, 159, 189, 213, 230, 246, 256
};
static const uint16_t silk_model_pitch_contour_mbwb10ms[] = {
256, 91, 137, 176, 195, 209, 221, 229, 236, 242, 247, 252, 256
};
static const uint16_t silk_model_pitch_contour_mbwb20ms[] = {
256, 33, 55, 73, 89, 104, 118, 132, 145, 158, 168, 177, 186, 194, 200, 206,
212, 217, 221, 225, 229, 232, 235, 238, 240, 242, 244, 246, 248, 250, 252, 253,
254, 255, 256
};
static const uint16_t silk_model_ltp_filter[] = { 256, 77, 157, 256 };
static const uint16_t silk_model_ltp_filter0_sel[] = {
256, 185, 200, 213, 226, 235, 244, 250, 256
};
static const uint16_t silk_model_ltp_filter1_sel[] = {
256, 57, 91, 112, 132, 147, 160, 172, 185, 195, 205, 214, 224, 233, 241, 248, 256
};
static const uint16_t silk_model_ltp_filter2_sel[] = {
256, 15, 31, 45, 57, 69, 81, 92, 103, 114, 124, 133, 142, 151, 160, 168,
176, 184, 192, 199, 206, 212, 218, 223, 227, 232, 236, 240, 244, 247, 251, 254, 256
};
static const uint16_t silk_model_ltp_scale_index[] = { 256, 128, 192, 256 };
static const uint16_t silk_model_lcg_seed[] = { 256, 64, 128, 192, 256 };
static const uint16_t silk_model_exc_rate[2][10] = {
{ 256, 15, 66, 78, 124, 169, 182, 215, 242, 256 }, // unvoiced
{ 256, 33, 63, 99, 116, 150, 199, 217, 238, 256 } // voiced
};
static const uint16_t silk_model_pulse_count[11][19] = {
{ 256, 131, 205, 230, 238, 241, 244, 245, 246,
247, 248, 249, 250, 251, 252, 253, 254, 255, 256 },
{ 256, 58, 151, 211, 234, 241, 244, 245, 246,
247, 248, 249, 250, 251, 252, 253, 254, 255, 256 },
{ 256, 43, 94, 140, 173, 197, 213, 224, 232,
238, 241, 244, 247, 249, 250, 251, 253, 254, 256 },
{ 256, 17, 69, 140, 197, 228, 240, 245, 246,
247, 248, 249, 250, 251, 252, 253, 254, 255, 256 },
{ 256, 6, 27, 68, 121, 170, 205, 226, 237,
243, 246, 248, 250, 251, 252, 253, 254, 255, 256 },
{ 256, 7, 21, 43, 71, 100, 128, 153, 173,
190, 203, 214, 223, 230, 235, 239, 243, 246, 256 },
{ 256, 2, 7, 21, 50, 92, 138, 179, 210,
229, 240, 246, 249, 251, 252, 253, 254, 255, 256 },
{ 256, 1, 3, 7, 17, 36, 65, 100, 137,
171, 199, 219, 233, 241, 246, 250, 252, 254, 256 },
{ 256, 1, 3, 5, 10, 19, 33, 53, 77,
104, 132, 158, 181, 201, 216, 227, 235, 241, 256 },
{ 256, 1, 2, 3, 9, 36, 94, 150, 189,
214, 228, 238, 244, 247, 250, 252, 253, 254, 256 },
{ 256, 2, 3, 9, 36, 94, 150, 189, 214,
228, 238, 244, 247, 250, 252, 253, 254, 256, 256 }
};
static const uint16_t silk_model_pulse_location[4][168] = {
{
256, 126, 256,
256, 56, 198, 256,
256, 25, 126, 230, 256,
256, 12, 72, 180, 244, 256,
256, 7, 42, 126, 213, 250, 256,
256, 4, 24, 83, 169, 232, 253, 256,
256, 3, 15, 53, 125, 200, 242, 254, 256,
256, 2, 10, 35, 89, 162, 221, 248, 255, 256,
256, 2, 7, 24, 63, 126, 191, 233, 251, 255, 256,
256, 1, 5, 17, 45, 94, 157, 211, 241, 252, 255, 256,
256, 1, 5, 13, 33, 70, 125, 182, 223, 245, 253, 255, 256,
256, 1, 4, 11, 26, 54, 98, 151, 199, 232, 248, 254, 255, 256,
256, 1, 3, 9, 21, 42, 77, 124, 172, 212, 237, 249, 254, 255, 256,
256, 1, 2, 6, 16, 33, 60, 97, 144, 187, 220, 241, 250, 254, 255, 256,
256, 1, 2, 3, 11, 25, 47, 80, 120, 163, 201, 229, 245, 253, 254, 255, 256,
256, 1, 2, 3, 4, 17, 35, 62, 98, 139, 180, 214, 238, 252, 253, 254, 255, 256
},{
256, 127, 256,
256, 53, 202, 256,
256, 22, 127, 233, 256,
256, 11, 72, 183, 246, 256,
256, 6, 41, 127, 215, 251, 256,
256, 4, 24, 83, 170, 232, 253, 256,
256, 3, 16, 56, 127, 200, 241, 254, 256,
256, 3, 12, 39, 92, 162, 218, 246, 255, 256,
256, 3, 11, 30, 67, 124, 185, 229, 249, 255, 256,
256, 3, 10, 25, 53, 97, 151, 200, 233, 250, 255, 256,
256, 1, 8, 21, 43, 77, 123, 171, 209, 237, 251, 255, 256,
256, 1, 2, 13, 35, 62, 97, 139, 186, 219, 244, 254, 255, 256,
256, 1, 2, 8, 22, 48, 85, 128, 171, 208, 234, 248, 254, 255, 256,
256, 1, 2, 6, 16, 36, 67, 107, 149, 189, 220, 240, 250, 254, 255, 256,
256, 1, 2, 5, 13, 29, 55, 90, 128, 166, 201, 227, 243, 251, 254, 255, 256,
256, 1, 2, 4, 10, 22, 43, 73, 109, 147, 183, 213, 234, 246, 252, 254, 255, 256
},{
256, 127, 256,
256, 49, 206, 256,
256, 20, 127, 236, 256,
256, 11, 71, 184, 246, 256,
256, 7, 43, 127, 214, 250, 256,
256, 6, 30, 87, 169, 229, 252, 256,
256, 5, 23, 62, 126, 194, 236, 252, 256,
256, 6, 20, 49, 96, 157, 209, 239, 253, 256,
256, 1, 16, 39, 74, 125, 175, 215, 245, 255, 256,
256, 1, 2, 23, 55, 97, 149, 195, 236, 254, 255, 256,
256, 1, 7, 23, 50, 86, 128, 170, 206, 233, 249, 255, 256,
256, 1, 6, 18, 39, 70, 108, 148, 186, 217, 238, 250, 255, 256,
256, 1, 4, 13, 30, 56, 90, 128, 166, 200, 226, 243, 252, 255, 256,
256, 1, 4, 11, 25, 47, 76, 110, 146, 180, 209, 231, 245, 252, 255, 256,
256, 1, 3, 8, 19, 37, 62, 93, 128, 163, 194, 219, 237, 248, 253, 255, 256,
256, 1, 2, 6, 15, 30, 51, 79, 111, 145, 177, 205, 226, 241, 250, 254, 255, 256
},{
256, 128, 256,
256, 42, 214, 256,
256, 21, 128, 235, 256,
256, 12, 72, 184, 245, 256,
256, 8, 42, 128, 214, 249, 256,
256, 8, 31, 86, 176, 231, 251, 256,
256, 5, 20, 58, 130, 202, 238, 253, 256,
256, 6, 18, 45, 97, 174, 221, 241, 251, 256,
256, 6, 25, 53, 88, 128, 168, 203, 231, 250, 256,
256, 4, 18, 40, 71, 108, 148, 185, 216, 238, 252, 256,
256, 3, 13, 31, 57, 90, 128, 166, 199, 225, 243, 253, 256,
256, 2, 10, 23, 44, 73, 109, 147, 183, 212, 233, 246, 254, 256,
256, 1, 6, 16, 33, 58, 90, 128, 166, 198, 223, 240, 250, 255, 256,
256, 1, 5, 12, 25, 46, 75, 110, 146, 181, 210, 231, 244, 251, 255, 256,
256, 1, 3, 8, 18, 35, 60, 92, 128, 164, 196, 221, 238, 248, 253, 255, 256,
256, 1, 3, 7, 14, 27, 48, 76, 110, 146, 180, 208, 229, 242, 249, 253, 255, 256
}
};
static const uint16_t silk_model_excitation_lsb[] = {256, 136, 256};
static const uint16_t silk_model_excitation_sign[3][2][7][3] = {
{ // Inactive
{ // Low offset
{256, 2, 256},
{256, 207, 256},
{256, 189, 256},
{256, 179, 256},
{256, 174, 256},
{256, 163, 256},
{256, 157, 256}
}, { // High offset
{256, 58, 256},
{256, 245, 256},
{256, 238, 256},
{256, 232, 256},
{256, 225, 256},
{256, 220, 256},
{256, 211, 256}
}
}, { // Unvoiced
{ // Low offset
{256, 1, 256},
{256, 210, 256},
{256, 190, 256},
{256, 178, 256},
{256, 169, 256},
{256, 162, 256},
{256, 152, 256}
}, { // High offset
{256, 48, 256},
{256, 242, 256},
{256, 235, 256},
{256, 224, 256},
{256, 214, 256},
{256, 205, 256},
{256, 190, 256}
}
}, { // Voiced
{ // Low offset
{256, 1, 256},
{256, 162, 256},
{256, 152, 256},
{256, 147, 256},
{256, 144, 256},
{256, 141, 256},
{256, 138, 256}
}, { // High offset
{256, 8, 256},
{256, 203, 256},
{256, 187, 256},
{256, 176, 256},
{256, 168, 256},
{256, 161, 256},
{256, 154, 256}
}
}
};
static const int16_t silk_stereo_weights[] = {
-13732, -10050, -8266, -7526, -6500, -5000, -2950, -820,
820, 2950, 5000, 6500, 7526, 8266, 10050, 13732
};
static const uint8_t silk_lsf_s2_model_sel_nbmb[32][10] = {
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 1, 3, 1, 2, 2, 1, 2, 1, 1, 1 },
{ 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
{ 1, 2, 2, 2, 2, 1, 2, 1, 1, 1 },
{ 2, 3, 3, 3, 3, 2, 2, 2, 2, 2 },
{ 0, 5, 3, 3, 2, 2, 2, 2, 1, 1 },
{ 0, 2, 2, 2, 2, 2, 2, 2, 2, 1 },
{ 2, 3, 6, 4, 4, 4, 5, 4, 5, 5 },
{ 2, 4, 5, 5, 4, 5, 4, 6, 4, 4 },
{ 2, 4, 4, 7, 4, 5, 4, 5, 5, 4 },
{ 4, 3, 3, 3, 2, 3, 2, 2, 2, 2 },
{ 1, 5, 5, 6, 4, 5, 4, 5, 5, 5 },
{ 2, 7, 4, 6, 5, 5, 5, 5, 5, 5 },
{ 2, 7, 5, 5, 5, 5, 5, 6, 5, 4 },
{ 3, 3, 5, 4, 4, 5, 4, 5, 4, 4 },
{ 2, 3, 3, 5, 5, 4, 4, 4, 4, 4 },
{ 2, 4, 4, 6, 4, 5, 4, 5, 5, 5 },
{ 2, 5, 4, 6, 5, 5, 5, 4, 5, 4 },
{ 2, 7, 4, 5, 4, 5, 4, 5, 5, 5 },
{ 2, 5, 4, 6, 7, 6, 5, 6, 5, 4 },
{ 3, 6, 7, 4, 6, 5, 5, 6, 4, 5 },
{ 2, 7, 6, 4, 4, 4, 5, 4, 5, 5 },
{ 4, 5, 5, 4, 6, 6, 5, 6, 5, 4 },
{ 2, 5, 5, 6, 5, 6, 4, 6, 4, 4 },
{ 4, 5, 5, 5, 3, 7, 4, 5, 5, 4 },
{ 2, 3, 4, 5, 5, 6, 4, 5, 5, 4 },
{ 2, 3, 2, 3, 3, 4, 2, 3, 3, 3 },
{ 1, 1, 2, 2, 2, 2, 2, 3, 2, 2 },
{ 4, 5, 5, 6, 6, 6, 5, 6, 4, 5 },
{ 3, 5, 5, 4, 4, 4, 4, 3, 3, 2 },
{ 2, 5, 3, 7, 5, 5, 4, 4, 5, 4 },
{ 4, 4, 5, 4, 5, 6, 5, 6, 5, 4 }
};
static const uint8_t silk_lsf_s2_model_sel_wb[32][16] = {
{ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 },
{ 10, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 9, 9, 8, 11 },
{ 10, 13, 13, 11, 15, 12, 12, 13, 10, 13, 12, 13, 13, 12, 11, 11 },
{ 8, 10, 9, 10, 10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 9 },
{ 8, 14, 13, 12, 14, 12, 15, 13, 12, 12, 12, 13, 13, 12, 12, 11 },
{ 8, 11, 13, 13, 12, 11, 11, 13, 11, 11, 11, 11, 11, 11, 10, 12 },
{ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 },
{ 8, 10, 14, 11, 15, 10, 13, 11, 12, 13, 13, 12, 11, 11, 10, 11 },
{ 8, 14, 10, 14, 14, 12, 13, 12, 14, 13, 12, 12, 13, 11, 11, 11 },
{ 10, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 },
{ 8, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9 },
{ 10, 10, 11, 12, 13, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 11 },
{ 10, 10, 11, 11, 12, 11, 11, 11, 11, 11, 11, 11, 11, 10, 9, 11 },
{ 11, 12, 12, 12, 14, 12, 12, 13, 11, 13, 12, 12, 13, 12, 11, 12 },
{ 8, 14, 12, 13, 12, 15, 13, 10, 14, 13, 15, 12, 12, 11, 13, 11 },
{ 8, 9, 8, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 9, 8 },
{ 9, 14, 13, 15, 13, 12, 13, 11, 12, 13, 12, 12, 12, 11, 11, 12 },
{ 9, 11, 11, 12, 12, 11, 11, 13, 10, 11, 11, 13, 13, 13, 11, 12 },
{ 10, 11, 11, 10, 10, 10, 11, 10, 9, 10, 9, 10, 9, 9, 9, 12 },
{ 8, 10, 11, 13, 11, 11, 10, 10, 10, 9, 9, 8, 8, 8, 8, 8 },
{ 11, 12, 11, 13, 11, 11, 10, 10, 9, 9, 9, 9, 9, 10, 10, 12 },
{ 10, 14, 11, 15, 15, 12, 13, 12, 13, 11, 13, 11, 11, 10, 11, 11 },
{ 10, 11, 13, 14, 14, 11, 13, 11, 12, 12, 11, 11, 11, 11, 10, 12 },
{ 9, 11, 11, 12, 12, 12, 12, 11, 13, 13, 13, 11, 9, 9, 9, 9 },
{ 10, 13, 11, 14, 14, 12, 15, 12, 12, 13, 11, 12, 12, 11, 11, 11 },
{ 8, 14, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 },
{ 8, 14, 14, 11, 13, 10, 13, 13, 11, 12, 12, 15, 15, 12, 12, 12 },
{ 11, 11, 15, 11, 13, 12, 11, 11, 11, 10, 10, 11, 11, 11, 10, 11 },
{ 8, 8, 9, 8, 8, 8, 10, 9, 10, 9, 9, 10, 10, 10, 9, 9 },
{ 8, 11, 10, 13, 11, 11, 10, 11, 10, 9, 8, 8, 9, 8, 8, 9 },
{ 11, 13, 13, 12, 15, 13, 11, 11, 10, 11, 10, 10, 9, 8, 9, 8 },
{ 10, 11, 13, 11, 12, 11, 11, 11, 10, 9, 10, 14, 12, 8, 8, 8 }
};
static const uint8_t silk_lsf_pred_weights_nbmb[2][9] = {
{179, 138, 140, 148, 151, 149, 153, 151, 163},
{116, 67, 82, 59, 92, 72, 100, 89, 92}
};
static const uint8_t silk_lsf_pred_weights_wb[2][15] = {
{175, 148, 160, 176, 178, 173, 174, 164, 177, 174, 196, 182, 198, 192, 182},
{ 68, 62, 66, 60, 72, 117, 85, 90, 118, 136, 151, 142, 160, 142, 155}
};
static const uint8_t silk_lsf_weight_sel_nbmb[32][9] = {
{ 0, 1, 0, 0, 0, 0, 0, 0, 0 },
{ 1, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 1, 1, 1, 0, 0, 0, 0, 1, 0 },
{ 0, 1, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 1, 0, 0, 0, 0, 0, 0, 0 },
{ 1, 0, 1, 1, 0, 0, 0, 1, 0 },
{ 0, 1, 1, 0, 0, 1, 1, 0, 0 },
{ 0, 0, 1, 1, 0, 1, 0, 1, 1 },
{ 0, 0, 1, 1, 0, 0, 1, 1, 1 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 1, 0, 1, 1, 1, 1, 1, 0 },
{ 0, 1, 0, 1, 1, 1, 1, 1, 0 },
{ 0, 1, 1, 1, 1, 1, 1, 1, 0 },
{ 1, 0, 1, 1, 0, 1, 1, 1, 1 },
{ 0, 1, 1, 1, 1, 1, 0, 1, 0 },
{ 0, 0, 1, 1, 0, 1, 0, 1, 0 },
{ 0, 0, 1, 1, 1, 0, 1, 1, 1 },
{ 0, 1, 1, 0, 0, 1, 1, 1, 0 },
{ 0, 0, 0, 1, 1, 1, 0, 1, 0 },
{ 0, 1, 1, 0, 0, 1, 0, 1, 0 },
{ 0, 1, 1, 0, 0, 0, 1, 1, 0 },
{ 0, 0, 0, 0, 0, 1, 1, 1, 1 },
{ 0, 0, 1, 1, 0, 0, 0, 1, 1 },
{ 0, 0, 0, 1, 0, 1, 1, 1, 1 },
{ 0, 1, 1, 1, 1, 1, 1, 1, 0 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 0, 1, 0, 1, 1, 0, 1, 0 },
{ 1, 0, 0, 1, 0, 0, 0, 0, 0 },
{ 0, 0, 0, 1, 1, 0, 1, 0, 1 },
{ 1, 0, 1, 1, 0, 1, 1, 1, 1 }
};
static const uint8_t silk_lsf_weight_sel_wb[32][15] = {
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 },
{ 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0 },
{ 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
{ 0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1 },
{ 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
{ 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0 },
{ 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0 },
{ 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1 },
{ 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
{ 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0 },
{ 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0 },
{ 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0 },
{ 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
{ 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1 },
{ 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0 },
{ 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0 }
};
static const uint8_t silk_lsf_codebook_nbmb[32][10] = {
{ 12, 35, 60, 83, 108, 132, 157, 180, 206, 228 },
{ 15, 32, 55, 77, 101, 125, 151, 175, 201, 225 },
{ 19, 42, 66, 89, 114, 137, 162, 184, 209, 230 },
{ 12, 25, 50, 72, 97, 120, 147, 172, 200, 223 },
{ 26, 44, 69, 90, 114, 135, 159, 180, 205, 225 },
{ 13, 22, 53, 80, 106, 130, 156, 180, 205, 228 },
{ 15, 25, 44, 64, 90, 115, 142, 168, 196, 222 },
{ 19, 24, 62, 82, 100, 120, 145, 168, 190, 214 },
{ 22, 31, 50, 79, 103, 120, 151, 170, 203, 227 },
{ 21, 29, 45, 65, 106, 124, 150, 171, 196, 224 },
{ 30, 49, 75, 97, 121, 142, 165, 186, 209, 229 },
{ 19, 25, 52, 70, 93, 116, 143, 166, 192, 219 },
{ 26, 34, 62, 75, 97, 118, 145, 167, 194, 217 },
{ 25, 33, 56, 70, 91, 113, 143, 165, 196, 223 },
{ 21, 34, 51, 72, 97, 117, 145, 171, 196, 222 },
{ 20, 29, 50, 67, 90, 117, 144, 168, 197, 221 },
{ 22, 31, 48, 66, 95, 117, 146, 168, 196, 222 },
{ 24, 33, 51, 77, 116, 134, 158, 180, 200, 224 },
{ 21, 28, 70, 87, 106, 124, 149, 170, 194, 217 },
{ 26, 33, 53, 64, 83, 117, 152, 173, 204, 225 },
{ 27, 34, 65, 95, 108, 129, 155, 174, 210, 225 },
{ 20, 26, 72, 99, 113, 131, 154, 176, 200, 219 },
{ 34, 43, 61, 78, 93, 114, 155, 177, 205, 229 },
{ 23, 29, 54, 97, 124, 138, 163, 179, 209, 229 },
{ 30, 38, 56, 89, 118, 129, 158, 178, 200, 231 },
{ 21, 29, 49, 63, 85, 111, 142, 163, 193, 222 },
{ 27, 48, 77, 103, 133, 158, 179, 196, 215, 232 },
{ 29, 47, 74, 99, 124, 151, 176, 198, 220, 237 },
{ 33, 42, 61, 76, 93, 121, 155, 174, 207, 225 },
{ 29, 53, 87, 112, 136, 154, 170, 188, 208, 227 },
{ 24, 30, 52, 84, 131, 150, 166, 186, 203, 229 },
{ 37, 48, 64, 84, 104, 118, 156, 177, 201, 230 }
};
static const uint8_t silk_lsf_codebook_wb[32][16] = {
{ 7, 23, 38, 54, 69, 85, 100, 116, 131, 147, 162, 178, 193, 208, 223, 239 },
{ 13, 25, 41, 55, 69, 83, 98, 112, 127, 142, 157, 171, 187, 203, 220, 236 },
{ 15, 21, 34, 51, 61, 78, 92, 106, 126, 136, 152, 167, 185, 205, 225, 240 },
{ 10, 21, 36, 50, 63, 79, 95, 110, 126, 141, 157, 173, 189, 205, 221, 237 },
{ 17, 20, 37, 51, 59, 78, 89, 107, 123, 134, 150, 164, 184, 205, 224, 240 },
{ 10, 15, 32, 51, 67, 81, 96, 112, 129, 142, 158, 173, 189, 204, 220, 236 },
{ 8, 21, 37, 51, 65, 79, 98, 113, 126, 138, 155, 168, 179, 192, 209, 218 },
{ 12, 15, 34, 55, 63, 78, 87, 108, 118, 131, 148, 167, 185, 203, 219, 236 },
{ 16, 19, 32, 36, 56, 79, 91, 108, 118, 136, 154, 171, 186, 204, 220, 237 },
{ 11, 28, 43, 58, 74, 89, 105, 120, 135, 150, 165, 180, 196, 211, 226, 241 },
{ 6, 16, 33, 46, 60, 75, 92, 107, 123, 137, 156, 169, 185, 199, 214, 225 },
{ 11, 19, 30, 44, 57, 74, 89, 105, 121, 135, 152, 169, 186, 202, 218, 234 },
{ 12, 19, 29, 46, 57, 71, 88, 100, 120, 132, 148, 165, 182, 199, 216, 233 },
{ 17, 23, 35, 46, 56, 77, 92, 106, 123, 134, 152, 167, 185, 204, 222, 237 },
{ 14, 17, 45, 53, 63, 75, 89, 107, 115, 132, 151, 171, 188, 206, 221, 240 },
{ 9, 16, 29, 40, 56, 71, 88, 103, 119, 137, 154, 171, 189, 205, 222, 237 },
{ 16, 19, 36, 48, 57, 76, 87, 105, 118, 132, 150, 167, 185, 202, 218, 236 },
{ 12, 17, 29, 54, 71, 81, 94, 104, 126, 136, 149, 164, 182, 201, 221, 237 },
{ 15, 28, 47, 62, 79, 97, 115, 129, 142, 155, 168, 180, 194, 208, 223, 238 },
{ 8, 14, 30, 45, 62, 78, 94, 111, 127, 143, 159, 175, 192, 207, 223, 239 },
{ 17, 30, 49, 62, 79, 92, 107, 119, 132, 145, 160, 174, 190, 204, 220, 235 },
{ 14, 19, 36, 45, 61, 76, 91, 108, 121, 138, 154, 172, 189, 205, 222, 238 },
{ 12, 18, 31, 45, 60, 76, 91, 107, 123, 138, 154, 171, 187, 204, 221, 236 },
{ 13, 17, 31, 43, 53, 70, 83, 103, 114, 131, 149, 167, 185, 203, 220, 237 },
{ 17, 22, 35, 42, 58, 78, 93, 110, 125, 139, 155, 170, 188, 206, 224, 240 },
{ 8, 15, 34, 50, 67, 83, 99, 115, 131, 146, 162, 178, 193, 209, 224, 239 },
{ 13, 16, 41, 66, 73, 86, 95, 111, 128, 137, 150, 163, 183, 206, 225, 241 },
{ 17, 25, 37, 52, 63, 75, 92, 102, 119, 132, 144, 160, 175, 191, 212, 231 },
{ 19, 31, 49, 65, 83, 100, 117, 133, 147, 161, 174, 187, 200, 213, 227, 242 },
{ 18, 31, 52, 68, 88, 103, 117, 126, 138, 149, 163, 177, 192, 207, 223, 239 },
{ 16, 29, 47, 61, 76, 90, 106, 119, 133, 147, 161, 176, 193, 209, 224, 240 },
{ 15, 21, 35, 50, 61, 73, 86, 97, 110, 119, 129, 141, 175, 198, 218, 237 }
};
static const uint16_t silk_lsf_min_spacing_nbmb[] = {
250, 3, 6, 3, 3, 3, 4, 3, 3, 3, 461
};
static const uint16_t silk_lsf_min_spacing_wb[] = {
100, 3, 40, 3, 3, 3, 5, 14, 14, 10, 11, 3, 8, 9, 7, 3, 347
};
static const uint8_t silk_lsf_ordering_nbmb[] = {
0, 9, 6, 3, 4, 5, 8, 1, 2, 7
};
static const uint8_t silk_lsf_ordering_wb[] = {
0, 15, 8, 7, 4, 11, 12, 3, 2, 13, 10, 5, 6, 9, 14, 1
};
static const int16_t silk_cosine[] = { /* (0.12) */
4096, 4095, 4091, 4085,
4076, 4065, 4052, 4036,
4017, 3997, 3973, 3948,
3920, 3889, 3857, 3822,
3784, 3745, 3703, 3659,
3613, 3564, 3513, 3461,
3406, 3349, 3290, 3229,
3166, 3102, 3035, 2967,
2896, 2824, 2751, 2676,
2599, 2520, 2440, 2359,
2276, 2191, 2106, 2019,
1931, 1842, 1751, 1660,
1568, 1474, 1380, 1285,
1189, 1093, 995, 897,
799, 700, 601, 501,
401, 301, 201, 101,
0, -101, -201, -301,
-401, -501, -601, -700,
-799, -897, -995, -1093,
-1189, -1285, -1380, -1474,
-1568, -1660, -1751, -1842,
-1931, -2019, -2106, -2191,
-2276, -2359, -2440, -2520,
-2599, -2676, -2751, -2824,
-2896, -2967, -3035, -3102,
-3166, -3229, -3290, -3349,
-3406, -3461, -3513, -3564,
-3613, -3659, -3703, -3745,
-3784, -3822, -3857, -3889,
-3920, -3948, -3973, -3997,
-4017, -4036, -4052, -4065,
-4076, -4085, -4091, -4095,
-4096
};
static const uint16_t silk_pitch_scale[] = { 4, 6, 8};
static const uint16_t silk_pitch_min_lag[] = { 16, 24, 32};
static const uint16_t silk_pitch_max_lag[] = {144, 216, 288};
static const int8_t silk_pitch_offset_nb10ms[3][2] = {
{ 0, 0},
{ 1, 0},
{ 0, 1}
};
static const int8_t silk_pitch_offset_nb20ms[11][4] = {
{ 0, 0, 0, 0},
{ 2, 1, 0, -1},
{-1, 0, 1, 2},
{-1, 0, 0, 1},
{-1, 0, 0, 0},
{ 0, 0, 0, 1},
{ 0, 0, 1, 1},
{ 1, 1, 0, 0},
{ 1, 0, 0, 0},
{ 0, 0, 0, -1},
{ 1, 0, 0, -1}
};
static const int8_t silk_pitch_offset_mbwb10ms[12][2] = {
{ 0, 0},
{ 0, 1},
{ 1, 0},
{-1, 1},
{ 1, -1},
{-1, 2},
{ 2, -1},
{-2, 2},
{ 2, -2},
{-2, 3},
{ 3, -2},
{-3, 3}
};
static const int8_t silk_pitch_offset_mbwb20ms[34][4] = {
{ 0, 0, 0, 0},
{ 0, 0, 1, 1},
{ 1, 1, 0, 0},
{-1, 0, 0, 0},
{ 0, 0, 0, 1},
{ 1, 0, 0, 0},
{-1, 0, 0, 1},
{ 0, 0, 0, -1},
{-1, 0, 1, 2},
{ 1, 0, 0, -1},
{-2, -1, 1, 2},
{ 2, 1, 0, -1},
{-2, 0, 0, 2},
{-2, 0, 1, 3},
{ 2, 1, -1, -2},
{-3, -1, 1, 3},
{ 2, 0, 0, -2},
{ 3, 1, 0, -2},
{-3, -1, 2, 4},
{-4, -1, 1, 4},
{ 3, 1, -1, -3},
{-4, -1, 2, 5},
{ 4, 2, -1, -3},
{ 4, 1, -1, -4},
{-5, -1, 2, 6},
{ 5, 2, -1, -4},
{-6, -2, 2, 6},
{-5, -2, 2, 5},
{ 6, 2, -1, -5},
{-7, -2, 3, 8},
{ 6, 2, -2, -6},
{ 5, 2, -2, -5},
{ 8, 3, -2, -7},
{-9, -3, 3, 9}
};
static const int8_t silk_ltp_filter0_taps[8][5] = {
{ 4, 6, 24, 7, 5},
{ 0, 0, 2, 0, 0},
{ 12, 28, 41, 13, -4},
{ -9, 15, 42, 25, 14},
{ 1, -2, 62, 41, -9},
{-10, 37, 65, -4, 3},
{ -6, 4, 66, 7, -8},
{ 16, 14, 38, -3, 33}
};
static const int8_t silk_ltp_filter1_taps[16][5] = {
{ 13, 22, 39, 23, 12},
{ -1, 36, 64, 27, -6},
{ -7, 10, 55, 43, 17},
{ 1, 1, 8, 1, 1},
{ 6, -11, 74, 53, -9},
{-12, 55, 76, -12, 8},
{ -3, 3, 93, 27, -4},
{ 26, 39, 59, 3, -8},
{ 2, 0, 77, 11, 9},
{ -8, 22, 44, -6, 7},
{ 40, 9, 26, 3, 9},
{ -7, 20, 101, -7, 4},
{ 3, -8, 42, 26, 0},
{-15, 33, 68, 2, 23},
{ -2, 55, 46, -2, 15},
{ 3, -1, 21, 16, 41}
};
static const int8_t silk_ltp_filter2_taps[32][5] = {
{ -6, 27, 61, 39, 5},
{-11, 42, 88, 4, 1},
{ -2, 60, 65, 6, -4},
{ -1, -5, 73, 56, 1},
{ -9, 19, 94, 29, -9},
{ 0, 12, 99, 6, 4},
{ 8, -19, 102, 46, -13},
{ 3, 2, 13, 3, 2},
{ 9, -21, 84, 72, -18},
{-11, 46, 104, -22, 8},
{ 18, 38, 48, 23, 0},
{-16, 70, 83, -21, 11},
{ 5, -11, 117, 22, -8},
{ -6, 23, 117, -12, 3},
{ 3, -8, 95, 28, 4},
{-10, 15, 77, 60, -15},
{ -1, 4, 124, 2, -4},
{ 3, 38, 84, 24, -25},
{ 2, 13, 42, 13, 31},
{ 21, -4, 56, 46, -1},
{ -1, 35, 79, -13, 19},
{ -7, 65, 88, -9, -14},
{ 20, 4, 81, 49, -29},
{ 20, 0, 75, 3, -17},
{ 5, -9, 44, 92, -8},
{ 1, -3, 22, 69, 31},
{ -6, 95, 41, -12, 5},
{ 39, 67, 16, -4, 1},
{ 0, -6, 120, 55, -36},
{-13, 44, 122, 4, -24},
{ 81, 5, 11, 3, 7},
{ 2, 0, 9, 10, 88}
};
static const uint16_t silk_ltp_scale_factor[] = {15565, 12288, 8192};
static const uint8_t silk_shell_blocks[3][2] = {
{ 5, 10}, // NB
{ 8, 15}, // MB
{10, 20} // WB
};
static const uint8_t silk_quant_offset[2][2] = { /* (0.23) */
{25, 60}, // Inactive or Unvoiced
{ 8, 25} // Voiced
};
static const int silk_stereo_interp_len[3] = {
64, 96, 128
};
static inline void silk_stabilize_lsf(int16_t nlsf[16], int order, const uint16_t min_delta[17])
{
int pass, i;
for (pass = 0; pass < 20; pass++) {
int k, min_diff = 0;
for (i = 0; i < order+1; i++) {
int low = i != 0 ? nlsf[i-1] : 0;
int high = i != order ? nlsf[i] : 32768;
int diff = (high - low) - (min_delta[i]);
if (diff < min_diff) {
min_diff = diff;
k = i;
if (pass == 20)
break;
}
}
if (min_diff == 0) /* no issues; stabilized */
return;
/* wiggle one or two LSFs */
if (k == 0) {
/* repel away from lower bound */
nlsf[0] = min_delta[0];
} else if (k == order) {
/* repel away from higher bound */
nlsf[order-1] = 32768 - min_delta[order];
} else {
/* repel away from current position */
int min_center = 0, max_center = 32768, center_val;
/* lower extent */
for (i = 0; i < k; i++)
min_center += min_delta[i];
min_center += min_delta[k] >> 1;
/* upper extent */
for (i = order; i > k; i--)
max_center -= min_delta[k];
max_center -= min_delta[k] >> 1;
/* move apart */
center_val = nlsf[k - 1] + nlsf[k];
center_val = (center_val >> 1) + (center_val & 1); // rounded divide by 2
center_val = FFMIN(max_center, FFMAX(min_center, center_val));
nlsf[k - 1] = center_val - (min_delta[k] >> 1);
nlsf[k] = nlsf[k - 1] + min_delta[k];
}
}
/* resort to the fall-back method, the standard method for LSF stabilization */
/* sort; as the LSFs should be nearly sorted, use insertion sort */
for (i = 1; i < order; i++) {
int j, value = nlsf[i];
for (j = i - 1; j >= 0 && nlsf[j] > value; j--)
nlsf[j + 1] = nlsf[j];
nlsf[j + 1] = value;
}
/* push forwards to increase distance */
if (nlsf[0] < min_delta[0])
nlsf[0] = min_delta[0];
for (i = 1; i < order; i++)
if (nlsf[i] < nlsf[i - 1] + min_delta[i])
nlsf[i] = nlsf[i - 1] + min_delta[i];
/* push backwards to increase distance */
if (nlsf[order-1] > 32768 - min_delta[order])
nlsf[order-1] = 32768 - min_delta[order];
for (i = order-2; i >= 0; i--)
if (nlsf[i] > nlsf[i + 1] - min_delta[i+1])
nlsf[i] = nlsf[i + 1] - min_delta[i+1];
return;
}
static inline int silk_is_lpc_stable(const int16_t lpc[16], int order)
{
int k, j, DC_resp = 0;
int32_t lpc32[2][16]; // Q24
int totalinvgain = 1 << 30; // 1.0 in Q30
int32_t *row = lpc32[0], *prevrow;
/* initialize the first row for the Levinson recursion */
for (k = 0; k < order; k++) {
DC_resp += lpc[k];
row[k] = lpc[k] * 4096;
}
if (DC_resp >= 4096)
return 0;
/* check if prediction gain pushes any coefficients too far */
for (k = order - 1; 1; k--) {
int rc; // Q31; reflection coefficient
int gaindiv; // Q30; inverse of the gain (the divisor)
int gain; // gain for this reflection coefficient
int fbits; // fractional bits used for the gain
int error; // Q29; estimate of the error of our partial estimate of 1/gaindiv
if (FFABS(row[k]) > 16773022)
return 0;
rc = -(row[k] * 128);
gaindiv = (1 << 30) - MULH(rc, rc);
totalinvgain = MULH(totalinvgain, gaindiv) << 2;
if (k == 0)
return (totalinvgain >= 107374);
/* approximate 1.0/gaindiv */
fbits = opus_ilog(gaindiv);
gain = ((1 << 29) - 1) / (gaindiv >> (fbits + 1 - 16)); // Q<fbits-16>
error = (1 << 29) - MULL(gaindiv << (15 + 16 - fbits), gain, 16);
gain = ((gain << 16) + (error * gain >> 13));
/* switch to the next row of the LPC coefficients */
prevrow = row;
row = lpc32[k & 1];
for (j = 0; j < k; j++) {
int x = prevrow[j] - ROUND_MULL(prevrow[k - j - 1], rc, 31);
row[j] = ROUND_MULL(x, gain, fbits);
}
}
}
static void silk_lsp2poly(const int32_t lsp[16], int32_t pol[16], int half_order)
{
int i, j;
pol[0] = 65536; // 1.0 in Q16
pol[1] = -lsp[0];
for (i = 1; i < half_order; i++) {
pol[i + 1] = pol[i - 1] * 2 - ROUND_MULL(lsp[2 * i], pol[i], 16);
for (j = i; j > 1; j--)
pol[j] += pol[j - 2] - ROUND_MULL(lsp[2 * i], pol[j - 1], 16);
pol[1] -= lsp[2 * i];
}
}
static void silk_lsf2lpc(const int16_t nlsf[16], float lpcf[16], int order)
{
int i, k;
int32_t lsp[16]; // Q17; 2*cos(LSF)
int32_t p[9], q[9]; // Q16
int32_t lpc32[16]; // Q17
int16_t lpc[16]; // Q12
/* convert the LSFs to LSPs, i.e. 2*cos(LSF) */
for (k = 0; k < order; k++) {
int index = nlsf[k] >> 8;
int offset = nlsf[k] & 255;
int k2 = (order == 10) ? silk_lsf_ordering_nbmb[k] : silk_lsf_ordering_wb[k];
/* interpolate and round */
lsp[k2] = silk_cosine[index] * 256;
lsp[k2] += (silk_cosine[index + 1] - silk_cosine[index]) * offset;
lsp[k2] = (lsp[k2] + 4) >> 3;
}
silk_lsp2poly(lsp , p, order >> 1);
silk_lsp2poly(lsp + 1, q, order >> 1);
/* reconstruct A(z) */
for (k = 0; k < order>>1; k++) {
lpc32[k] = -p[k + 1] - p[k] - q[k + 1] + q[k];
lpc32[order-k-1] = -p[k + 1] - p[k] + q[k + 1] - q[k];
}
/* limit the range of the LPC coefficients to each fit within an int16_t */
for (i = 0; i < 10; i++) {
int j;
unsigned int maxabs = 0;
for (j = 0, k = 0; j < order; j++) {
unsigned int x = FFABS(lpc32[k]);
if (x > maxabs) {
maxabs = x; // Q17
k = j;
}
}
maxabs = (maxabs + 16) >> 5; // convert to Q12
if (maxabs > 32767) {
/* perform bandwidth expansion */
unsigned int chirp, chirp_base; // Q16
maxabs = FFMIN(maxabs, 163838); // anything above this overflows chirp's numerator
chirp_base = chirp = 65470 - ((maxabs - 32767) << 14) / ((maxabs * (k+1)) >> 2);
for (k = 0; k < order; k++) {
lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16);
chirp = (chirp_base * chirp + 32768) >> 16;
}
} else break;
}
if (i == 10) {
/* time's up: just clamp */
for (k = 0; k < order; k++) {
int x = (lpc32[k] + 16) >> 5;
lpc[k] = av_clip_int16(x);
lpc32[k] = lpc[k] << 5; // shortcut mandated by the spec; drops lower 5 bits
}
} else {
for (k = 0; k < order; k++)
lpc[k] = (lpc32[k] + 16) >> 5;
}
/* if the prediction gain causes the LPC filter to become unstable,
apply further bandwidth expansion on the Q17 coefficients */
for (i = 1; i <= 16 && !silk_is_lpc_stable(lpc, order); i++) {
unsigned int chirp, chirp_base;
chirp_base = chirp = 65536 - (1 << i);
for (k = 0; k < order; k++) {
lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16);
lpc[k] = (lpc32[k] + 16) >> 5;
chirp = (chirp_base * chirp + 32768) >> 16;
}
}
for (i = 0; i < order; i++)
lpcf[i] = lpc[i] / 4096.0f;
}
static inline void silk_decode_lpc(SilkContext *s, SilkFrame *frame,
OpusRangeCoder *rc,
float lpc_leadin[16], float lpc[16],
int *lpc_order, int *has_lpc_leadin, int voiced)
{
int i;
int order; // order of the LP polynomial; 10 for NB/MB and 16 for WB
int8_t lsf_i1, lsf_i2[16]; // stage-1 and stage-2 codebook indices
int16_t lsf_res[16]; // residual as a Q10 value
int16_t nlsf[16]; // Q15
*lpc_order = order = s->wb ? 16 : 10;
/* obtain LSF stage-1 and stage-2 indices */
lsf_i1 = opus_rc_getsymbol(rc, silk_model_lsf_s1[s->wb][voiced]);
for (i = 0; i < order; i++) {
int index = s->wb ? silk_lsf_s2_model_sel_wb [lsf_i1][i] :
silk_lsf_s2_model_sel_nbmb[lsf_i1][i];
lsf_i2[i] = opus_rc_getsymbol(rc, silk_model_lsf_s2[index]) - 4;
if (lsf_i2[i] == -4)
lsf_i2[i] -= opus_rc_getsymbol(rc, silk_model_lsf_s2_ext);
else if (lsf_i2[i] == 4)
lsf_i2[i] += opus_rc_getsymbol(rc, silk_model_lsf_s2_ext);
}
/* reverse the backwards-prediction step */
for (i = order - 1; i >= 0; i--) {
int qstep = s->wb ? 9830 : 11796;
lsf_res[i] = lsf_i2[i] * 1024;
if (lsf_i2[i] < 0) lsf_res[i] += 102;
else if (lsf_i2[i] > 0) lsf_res[i] -= 102;
lsf_res[i] = (lsf_res[i] * qstep) >> 16;
if (i + 1 < order) {
int weight = s->wb ? silk_lsf_pred_weights_wb [silk_lsf_weight_sel_wb [lsf_i1][i]][i] :
silk_lsf_pred_weights_nbmb[silk_lsf_weight_sel_nbmb[lsf_i1][i]][i];
lsf_res[i] += (lsf_res[i+1] * weight) >> 8;
}
}
/* reconstruct the NLSF coefficients from the supplied indices */
for (i = 0; i < order; i++) {
const uint8_t * codebook = s->wb ? silk_lsf_codebook_wb [lsf_i1] :
silk_lsf_codebook_nbmb[lsf_i1];
int cur, prev, next, weight_sq, weight, ipart, fpart, y, value;
/* find the weight of the residual */
/* TODO: precompute */
cur = codebook[i];
prev = i ? codebook[i - 1] : 0;
next = i + 1 < order ? codebook[i + 1] : 256;
weight_sq = (1024 / (cur - prev) + 1024 / (next - cur)) << 16;
/* approximate square-root with mandated fixed-point arithmetic */
ipart = opus_ilog(weight_sq);
fpart = (weight_sq >> (ipart-8)) & 127;
y = ((ipart & 1) ? 32768 : 46214) >> ((32 - ipart)>>1);
weight = y + ((213 * fpart * y) >> 16);
value = cur * 128 + (lsf_res[i] * 16384) / weight;
nlsf[i] = av_clip(value, 0, 32767);
}
/* stabilize the NLSF coefficients */
silk_stabilize_lsf(nlsf, order, s->wb ? silk_lsf_min_spacing_wb :
silk_lsf_min_spacing_nbmb);
/* produce an interpolation for the first 2 subframes, */
/* and then convert both sets of NLSFs to LPC coefficients */
*has_lpc_leadin = 0;
if (s->subframes == 4) {
int offset = opus_rc_getsymbol(rc, silk_model_lsf_interpolation_offset);
if (offset != 4 && frame->coded) {
*has_lpc_leadin = 1;
if (offset != 0) {
int16_t nlsf_leadin[16];
for (i = 0; i < order; i++)
nlsf_leadin[i] = frame->nlsf[i] +
((nlsf[i] - frame->nlsf[i]) * offset >> 2);
silk_lsf2lpc(nlsf_leadin, lpc_leadin, order);
} else /* avoid re-computation for a (roughly) 1-in-4 occurrence */
memcpy(lpc_leadin, frame->lpc, 16 * sizeof(float));
} else
offset = 4;
s->nlsf_interp_factor = offset;
silk_lsf2lpc(nlsf, lpc, order);
} else {
s->nlsf_interp_factor = 4;
silk_lsf2lpc(nlsf, lpc, order);
}
memcpy(frame->nlsf, nlsf, order * sizeof(nlsf[0]));
memcpy(frame->lpc, lpc, order * sizeof(lpc[0]));
}
static inline void silk_count_children(OpusRangeCoder *rc, int model, int32_t total,
int32_t child[2])
{
if (total != 0) {
child[0] = opus_rc_getsymbol(rc,
silk_model_pulse_location[model] + (((total - 1 + 5) * (total - 1)) >> 1));
child[1] = total - child[0];
} else {
child[0] = 0;
child[1] = 0;
}
}
static inline void silk_decode_excitation(SilkContext *s, OpusRangeCoder *rc,
float* excitationf,
int qoffset_high, int active, int voiced)
{
int i;
uint32_t seed;
int shellblocks;
int ratelevel;
uint8_t pulsecount[20]; // total pulses in each shell block
uint8_t lsbcount[20] = {0}; // raw lsbits defined for each pulse in each shell block
int32_t excitation[320]; // Q23
/* excitation parameters */
seed = opus_rc_getsymbol(rc, silk_model_lcg_seed);
shellblocks = silk_shell_blocks[s->bandwidth][s->subframes >> 2];
ratelevel = opus_rc_getsymbol(rc, silk_model_exc_rate[voiced]);
for (i = 0; i < shellblocks; i++) {
pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[ratelevel]);
if (pulsecount[i] == 17) {
while (pulsecount[i] == 17 && ++lsbcount[i] != 10)
pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[9]);
if (lsbcount[i] == 10)
pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[10]);
}
}
/* decode pulse locations using PVQ */
for (i = 0; i < shellblocks; i++) {
if (pulsecount[i] != 0) {
int a, b, c, d;
int32_t * location = excitation + 16*i;
int32_t branch[4][2];
branch[0][0] = pulsecount[i];
/* unrolled tail recursion */
for (a = 0; a < 1; a++) {
silk_count_children(rc, 0, branch[0][a], branch[1]);
for (b = 0; b < 2; b++) {
silk_count_children(rc, 1, branch[1][b], branch[2]);
for (c = 0; c < 2; c++) {
silk_count_children(rc, 2, branch[2][c], branch[3]);
for (d = 0; d < 2; d++) {
silk_count_children(rc, 3, branch[3][d], location);
location += 2;
}
}
}
}
} else
memset(excitation + 16*i, 0, 16*sizeof(int32_t));
}
/* decode least significant bits */
for (i = 0; i < shellblocks << 4; i++) {
int bit;
for (bit = 0; bit < lsbcount[i >> 4]; bit++)
excitation[i] = (excitation[i] << 1) |
opus_rc_getsymbol(rc, silk_model_excitation_lsb);
}
/* decode signs */
for (i = 0; i < shellblocks << 4; i++) {
if (excitation[i] != 0) {
int sign = opus_rc_getsymbol(rc, silk_model_excitation_sign[active +
voiced][qoffset_high][FFMIN(pulsecount[i >> 4], 6)]);
if (sign == 0)
excitation[i] *= -1;
}
}
/* assemble the excitation */
for (i = 0; i < shellblocks << 4; i++) {
int value = excitation[i];
excitation[i] = value * 256 | silk_quant_offset[voiced][qoffset_high];
if (value < 0) excitation[i] += 20;
else if (value > 0) excitation[i] -= 20;
/* invert samples pseudorandomly */
seed = 196314165 * seed + 907633515;
if (seed & 0x80000000)
excitation[i] *= -1;
seed += value;
excitationf[i] = excitation[i] / 8388608.0f;
}
}
/** Maximum residual history according to 4.2.7.6.1 */
#define SILK_MAX_LAG (288 + LTP_ORDER / 2)
/** Order of the LTP filter */
#define LTP_ORDER 5
static void silk_decode_frame(SilkContext *s, OpusRangeCoder *rc,
int frame_num, int channel, int coded_channels, int active, int active1)
{
/* per frame */
int voiced; // combines with active to indicate inactive, active, or active+voiced
int qoffset_high;
int order; // order of the LPC coefficients
float lpc_leadin[16], lpc_body[16], residual[SILK_MAX_LAG + SILK_HISTORY];
int has_lpc_leadin;
float ltpscale;
/* per subframe */
struct {
float gain;
int pitchlag;
float ltptaps[5];
} sf[4];
SilkFrame * const frame = s->frame + channel;
int i;
/* obtain stereo weights */
if (coded_channels == 2 && channel == 0) {
int n, wi[2], ws[2], w[2];
n = opus_rc_getsymbol(rc, silk_model_stereo_s1);
wi[0] = opus_rc_getsymbol(rc, silk_model_stereo_s2) + 3 * (n / 5);
ws[0] = opus_rc_getsymbol(rc, silk_model_stereo_s3);
wi[1] = opus_rc_getsymbol(rc, silk_model_stereo_s2) + 3 * (n % 5);
ws[1] = opus_rc_getsymbol(rc, silk_model_stereo_s3);
for (i = 0; i < 2; i++)
w[i] = silk_stereo_weights[wi[i]] +
(((silk_stereo_weights[wi[i] + 1] - silk_stereo_weights[wi[i]]) * 6554) >> 16)
* (ws[i]*2 + 1);
s->stereo_weights[0] = (w[0] - w[1]) / 8192.0;
s->stereo_weights[1] = w[1] / 8192.0;
/* and read the mid-only flag */
s->midonly = active1 ? 0 : opus_rc_getsymbol(rc, silk_model_mid_only);
}
/* obtain frame type */
if (!active) {
qoffset_high = opus_rc_getsymbol(rc, silk_model_frame_type_inactive);
voiced = 0;
} else {
int type = opus_rc_getsymbol(rc, silk_model_frame_type_active);
qoffset_high = type & 1;
voiced = type >> 1;
}
/* obtain subframe quantization gains */
for (i = 0; i < s->subframes; i++) {
int log_gain; //Q7
int ipart, fpart, lingain;
if (i == 0 && (frame_num == 0 || !frame->coded)) {
/* gain is coded absolute */
int x = opus_rc_getsymbol(rc, silk_model_gain_highbits[active + voiced]);
log_gain = (x<<3) | opus_rc_getsymbol(rc, silk_model_gain_lowbits);
if (frame->coded)
log_gain = FFMAX(log_gain, frame->log_gain - 16);
} else {
/* gain is coded relative */
int delta_gain = opus_rc_getsymbol(rc, silk_model_gain_delta);
log_gain = av_clip(FFMAX((delta_gain<<1) - 16,
frame->log_gain + delta_gain - 4), 0, 63);
}
frame->log_gain = log_gain;
/* approximate 2**(x/128) with a Q7 (i.e. non-integer) input */
log_gain = (log_gain * 0x1D1C71 >> 16) + 2090;
ipart = log_gain >> 7;
fpart = log_gain & 127;
lingain = (1 << ipart) + ((-174 * fpart * (128-fpart) >>16) + fpart) * ((1<<ipart) >> 7);
sf[i].gain = lingain / 65536.0f;
}
/* obtain LPC filter coefficients */
silk_decode_lpc(s, frame, rc, lpc_leadin, lpc_body, &order, &has_lpc_leadin, voiced);
/* obtain pitch lags, if this is a voiced frame */
if (voiced) {
int lag_absolute = (!frame_num || !frame->prev_voiced);
int primarylag; // primary pitch lag for the entire SILK frame
int ltpfilter;
const int8_t * offsets;
if (!lag_absolute) {
int delta = opus_rc_getsymbol(rc, silk_model_pitch_delta);
if (delta)
primarylag = frame->primarylag + delta - 9;
else
lag_absolute = 1;
}
if (lag_absolute) {
/* primary lag is coded absolute */
int highbits, lowbits;
const uint16_t *model[] = {
silk_model_pitch_lowbits_nb, silk_model_pitch_lowbits_mb,
silk_model_pitch_lowbits_wb
};
highbits = opus_rc_getsymbol(rc, silk_model_pitch_highbits);
lowbits = opus_rc_getsymbol(rc, model[s->bandwidth]);
primarylag = silk_pitch_min_lag[s->bandwidth] +
highbits*silk_pitch_scale[s->bandwidth] + lowbits;
}
frame->primarylag = primarylag;
if (s->subframes == 2)
offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND)
? silk_pitch_offset_nb10ms[opus_rc_getsymbol(rc,
silk_model_pitch_contour_nb10ms)]
: silk_pitch_offset_mbwb10ms[opus_rc_getsymbol(rc,
silk_model_pitch_contour_mbwb10ms)];
else
offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND)
? silk_pitch_offset_nb20ms[opus_rc_getsymbol(rc,
silk_model_pitch_contour_nb20ms)]
: silk_pitch_offset_mbwb20ms[opus_rc_getsymbol(rc,
silk_model_pitch_contour_mbwb20ms)];
for (i = 0; i < s->subframes; i++)
sf[i].pitchlag = av_clip(primarylag + offsets[i],
silk_pitch_min_lag[s->bandwidth],
silk_pitch_max_lag[s->bandwidth]);
/* obtain LTP filter coefficients */
ltpfilter = opus_rc_getsymbol(rc, silk_model_ltp_filter);
for (i = 0; i < s->subframes; i++) {
int index, j;
const uint16_t *filter_sel[] = {
silk_model_ltp_filter0_sel, silk_model_ltp_filter1_sel,
silk_model_ltp_filter2_sel
};
const int8_t (*filter_taps[])[5] = {
silk_ltp_filter0_taps, silk_ltp_filter1_taps, silk_ltp_filter2_taps
};
index = opus_rc_getsymbol(rc, filter_sel[ltpfilter]);
for (j = 0; j < 5; j++)
sf[i].ltptaps[j] = filter_taps[ltpfilter][index][j] / 128.0f;
}
}
/* obtain LTP scale factor */
if (voiced && frame_num == 0)
ltpscale = silk_ltp_scale_factor[opus_rc_getsymbol(rc,
silk_model_ltp_scale_index)] / 16384.0f;
else ltpscale = 15565.0f/16384.0f;
/* generate the excitation signal for the entire frame */
silk_decode_excitation(s, rc, residual + SILK_MAX_LAG, qoffset_high,
active, voiced);
/* skip synthesising the side channel if we want mono-only */
if (s->output_channels == channel)
return;
/* generate the output signal */
for (i = 0; i < s->subframes; i++) {
const float * lpc_coeff = (i < 2 && has_lpc_leadin) ? lpc_leadin : lpc_body;
float *dst = frame->output + SILK_HISTORY + i * s->sflength;
float *resptr = residual + SILK_MAX_LAG + i * s->sflength;
float *lpc = frame->lpc_history + SILK_HISTORY + i * s->sflength;
float sum;
int j, k;
if (voiced) {
int out_end;
float scale;
if (i < 2 || s->nlsf_interp_factor == 4) {
out_end = -i * s->sflength;
scale = ltpscale;
} else {
out_end = -(i - 2) * s->sflength;
scale = 1.0f;
}
/* when the LPC coefficients change, a re-whitening filter is used */
/* to produce a residual that accounts for the change */
for (j = - sf[i].pitchlag - LTP_ORDER/2; j < out_end; j++) {
sum = dst[j];
for (k = 0; k < order; k++)
sum -= lpc_coeff[k] * dst[j - k - 1];
resptr[j] = av_clipf(sum, -1.0f, 1.0f) * scale / sf[i].gain;
}
if (out_end) {
float rescale = sf[i-1].gain / sf[i].gain;
for (j = out_end; j < 0; j++)
resptr[j] *= rescale;
}
/* LTP synthesis */
for (j = 0; j < s->sflength; j++) {
sum = resptr[j];
for (k = 0; k < LTP_ORDER; k++)
sum += sf[i].ltptaps[k] * resptr[j - sf[i].pitchlag + LTP_ORDER/2 - k];
resptr[j] = sum;
}
}
/* LPC synthesis */
for (j = 0; j < s->sflength; j++) {
sum = resptr[j] * sf[i].gain;
for (k = 1; k <= order; k++)
sum += lpc_coeff[k - 1] * lpc[j - k];
lpc[j] = sum;
dst[j] = av_clipf(sum, -1.0f, 1.0f);
}
}
frame->prev_voiced = voiced;
memmove(frame->lpc_history, frame->lpc_history + s->flength, SILK_HISTORY * sizeof(float));
memmove(frame->output, frame->output + s->flength, SILK_HISTORY * sizeof(float));
frame->coded = 1;
}
static void silk_unmix_ms(SilkContext *s, float *l, float *r)
{
float *mid = s->frame[0].output + SILK_HISTORY - s->flength;
float *side = s->frame[1].output + SILK_HISTORY - s->flength;
float w0_prev = s->prev_stereo_weights[0];
float w1_prev = s->prev_stereo_weights[1];
float w0 = s->stereo_weights[0];
float w1 = s->stereo_weights[1];
int n1 = silk_stereo_interp_len[s->bandwidth];
int i;
for (i = 0; i < n1; i++) {
float interp0 = w0_prev + i * (w0 - w0_prev) / n1;
float interp1 = w1_prev + i * (w1 - w1_prev) / n1;
float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]);
l[i] = av_clipf((1 + interp1) * mid[i - 1] + side[i - 1] + interp0 * p0, -1.0, 1.0);
r[i] = av_clipf((1 - interp1) * mid[i - 1] - side[i - 1] - interp0 * p0, -1.0, 1.0);
}
for (; i < s->flength; i++) {
float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]);
l[i] = av_clipf((1 + w1) * mid[i - 1] + side[i - 1] + w0 * p0, -1.0, 1.0);
r[i] = av_clipf((1 - w1) * mid[i - 1] - side[i - 1] - w0 * p0, -1.0, 1.0);
}
memcpy(s->prev_stereo_weights, s->stereo_weights, sizeof(s->stereo_weights));
}
static void silk_flush_frame(SilkFrame *frame)
{
if (!frame->coded)
return;
memset(frame->output, 0, sizeof(frame->output));
memset(frame->lpc_history, 0, sizeof(frame->lpc_history));
memset(frame->lpc, 0, sizeof(frame->lpc));
memset(frame->nlsf, 0, sizeof(frame->nlsf));
frame->log_gain = 0;
frame->primarylag = 0;
frame->prev_voiced = 0;
frame->coded = 0;
}
int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc,
float *output[2],
enum OpusBandwidth bandwidth,
int coded_channels,
int duration_ms)
{
int active[2][6], redundancy[2];
int nb_frames, i, j;
if (bandwidth > OPUS_BANDWIDTH_WIDEBAND ||
coded_channels > 2 || duration_ms > 60) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid parameters passed "
"to the SILK decoder.\n");
return AVERROR(EINVAL);
}
nb_frames = 1 + (duration_ms > 20) + (duration_ms > 40);
s->subframes = duration_ms / nb_frames / 5; // 5ms subframes
s->sflength = 20 * (bandwidth + 2);
s->flength = s->sflength * s->subframes;
s->bandwidth = bandwidth;
s->wb = bandwidth == OPUS_BANDWIDTH_WIDEBAND;
/* make sure to flush the side channel when switching from mono to stereo */
if (coded_channels > s->prev_coded_channels)
silk_flush_frame(&s->frame[1]);
s->prev_coded_channels = coded_channels;
/* read the LP-layer header bits */
for (i = 0; i < coded_channels; i++) {
for (j = 0; j < nb_frames; j++)
active[i][j] = opus_rc_p2model(rc, 1);
redundancy[i] = opus_rc_p2model(rc, 1);
if (redundancy[i]) {
av_log(s->avctx, AV_LOG_ERROR, "LBRR frames present; this is unsupported\n");
return AVERROR_PATCHWELCOME;
}
}
for (i = 0; i < nb_frames; i++) {
for (j = 0; j < coded_channels && !s->midonly; j++)
silk_decode_frame(s, rc, i, j, coded_channels, active[j][i], active[1][i]);
/* reset the side channel if it is not coded */
if (s->midonly && s->frame[1].coded)
silk_flush_frame(&s->frame[1]);
if (coded_channels == 1 || s->output_channels == 1) {
for (j = 0; j < s->output_channels; j++) {
memcpy(output[j] + i * s->flength,
s->frame[0].output + SILK_HISTORY - s->flength - 2,
s->flength * sizeof(float));
}
} else {
silk_unmix_ms(s, output[0] + i * s->flength, output[1] + i * s->flength);
}
s->midonly = 0;
}
return nb_frames * s->flength;
}
void ff_silk_free(SilkContext **ps)
{
av_freep(ps);
}
void ff_silk_flush(SilkContext *s)
{
silk_flush_frame(&s->frame[0]);
silk_flush_frame(&s->frame[1]);
memset(s->prev_stereo_weights, 0, sizeof(s->prev_stereo_weights));
}
int ff_silk_init(AVCodecContext *avctx, SilkContext **ps, int output_channels)
{
SilkContext *s;
if (output_channels != 1 && output_channels != 2) {
av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n",
output_channels);
return AVERROR(EINVAL);
}
s = av_mallocz(sizeof(*s));
if (!s)
return AVERROR(ENOMEM);
s->avctx = avctx;
s->output_channels = output_channels;
ff_silk_flush(s);
*ps = s;
return 0;
}
libavcodec/opusdec.c 0 → 100644
浏览文件 @ b70d7a4a
/*
* Opus decoder
* Copyright (c) 2012 Andrew D'Addesio
* Copyright (c) 2013-2014 Mozilla Corporation
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Opus decoder
* @author Andrew D'Addesio, Anton Khirnov
*
* Codec homepage: http://opus-codec.org/
* Specification: http://tools.ietf.org/html/rfc6716
* Ogg Opus specification: https://tools.ietf.org/html/draft-ietf-codec-oggopus-03
*
* Ogg-contained .opus files can be produced with opus-tools:
* http://git.xiph.org/?p=opus-tools.git
*/
#include <stdint.h>
#include "libavutil/attributes.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavresample/avresample.h"
#include "avcodec.h"
#include "celp_filters.h"
#include "fft.h"
#include "get_bits.h"
#include "internal.h"
#include "mathops.h"
#include "opus.h"
static const uint16_t silk_frame_duration_ms[16] = {
10, 20, 40, 60,
10, 20, 40, 60,
10, 20, 40, 60,
10, 20,
10, 20,
};
/* number of samples of silence to feed to the resampler
* at the beginning */
static const int silk_resample_delay[] = {
4, 8, 11, 11, 11
};
static const uint8_t celt_band_end[] = { 13, 17, 17, 19, 21 };
static int get_silk_samplerate(int config)
{
if (config < 4)
return 8000;
else if (config < 8)
return 12000;
return 16000;
}
/**
* Range decoder
*/
static int opus_rc_init(OpusRangeCoder *rc, const uint8_t *data, int size)
{
int ret = init_get_bits8(&rc->gb, data, size);
if (ret < 0)
return ret;
rc->range = 128;
rc->value = 127 - get_bits(&rc->gb, 7);
rc->total_read_bits = 9;
opus_rc_normalize(rc);
return 0;
}
static void opus_raw_init(OpusRangeCoder *rc, const uint8_t *rightend,
unsigned int bytes)
{
rc->rb.position = rightend;
rc->rb.bytes = bytes;
rc->rb.cachelen = 0;
rc->rb.cacheval = 0;
}
static void opus_fade(float *out,
const float *in1, const float *in2,
const float *window, int len)
{
int i;
for (i = 0; i < len; i++)
out[i] = in2[i] * window[i] + in1[i] * (1.0 - window[i]);
}
static int opus_flush_resample(OpusStreamContext *s, int nb_samples)
{
int celt_size = av_audio_fifo_size(s->celt_delay);
int ret, i;
ret = avresample_convert(s->avr, (uint8_t**)s->out, s->out_size, nb_samples,
NULL, 0, 0);
if (ret < 0)
return ret;
else if (ret != nb_samples) {
av_log(s->avctx, AV_LOG_ERROR, "Wrong number of flushed samples: %d\n",
ret);
return AVERROR_BUG;
}
if (celt_size) {
if (celt_size != nb_samples) {
av_log(s->avctx, AV_LOG_ERROR, "Wrong number of CELT delay samples.\n");
return AVERROR_BUG;
}
av_audio_fifo_read(s->celt_delay, (void**)s->celt_output, nb_samples);
for (i = 0; i < s->output_channels; i++) {
s->fdsp->vector_fmac_scalar(s->out[i],
s->celt_output[i], 1.0,
nb_samples);
}
}
if (s->redundancy_idx) {
for (i = 0; i < s->output_channels; i++)
opus_fade(s->out[i], s->out[i],
s->redundancy_output[i] + 120 + s->redundancy_idx,
ff_celt_window2 + s->redundancy_idx, 120 - s->redundancy_idx);
s->redundancy_idx = 0;
}
s->out[0] += nb_samples;
s->out[1] += nb_samples;
s->out_size -= nb_samples * sizeof(float);
return 0;
}
static int opus_init_resample(OpusStreamContext *s)
{
float delay[16] = { 0.0 };
uint8_t *delayptr[2] = { (uint8_t*)delay, (uint8_t*)delay };
int ret;
av_opt_set_int(s->avr, "in_sample_rate", s->silk_samplerate, 0);
ret = avresample_open(s->avr);
if (ret < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Error opening the resampler.\n");
return ret;
}
ret = avresample_convert(s->avr, NULL, 0, 0, delayptr, sizeof(delay),
silk_resample_delay[s->packet.bandwidth]);
if (ret < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"Error feeding initial silence to the resampler.\n");
return ret;
}
return 0;
}
static int opus_decode_redundancy(OpusStreamContext *s, const uint8_t *data, int size)
{
int ret;
enum OpusBandwidth bw = s->packet.bandwidth;
if (s->packet.mode == OPUS_MODE_SILK &&
bw == OPUS_BANDWIDTH_MEDIUMBAND)
bw = OPUS_BANDWIDTH_WIDEBAND;
ret = opus_rc_init(&s->redundancy_rc, data, size);
if (ret < 0)
goto fail;
opus_raw_init(&s->redundancy_rc, data + size, size);
ret = ff_celt_decode_frame(s->celt, &s->redundancy_rc,
s->redundancy_output,
s->packet.stereo + 1, 240,
0, celt_band_end[s->packet.bandwidth]);
if (ret < 0)
goto fail;
return 0;
fail:
av_log(s->avctx, AV_LOG_ERROR, "Error decoding the redundancy frame.\n");
return ret;
}
static int opus_decode_frame(OpusStreamContext *s, const uint8_t *data, int size)
{
int samples = s->packet.frame_duration;
int redundancy = 0;
int redundancy_size, redundancy_pos;
int ret, i, consumed;
int delayed_samples = s->delayed_samples;
ret = opus_rc_init(&s->rc, data, size);
if (ret < 0)
return ret;
/* decode the silk frame */
if (s->packet.mode == OPUS_MODE_SILK || s->packet.mode == OPUS_MODE_HYBRID) {
if (!avresample_is_open(s->avr)) {
ret = opus_init_resample(s);
if (ret < 0)
return ret;
}
samples = ff_silk_decode_superframe(s->silk, &s->rc, s->silk_output,
FFMIN(s->packet.bandwidth, OPUS_BANDWIDTH_WIDEBAND),
s->packet.stereo + 1,
silk_frame_duration_ms[s->packet.config]);
if (samples < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Error decoding a SILK frame.\n");
return samples;
}
samples = avresample_convert(s->avr, (uint8_t**)s->out, s->out_size,
s->packet.frame_duration,
(uint8_t**)s->silk_output,
sizeof(s->silk_buf[0]),
samples);
if (samples < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Error resampling SILK data.\n");
return samples;
}
s->delayed_samples += s->packet.frame_duration - samples;
} else
ff_silk_flush(s->silk);
// decode redundancy information
consumed = opus_rc_tell(&s->rc);
if (s->packet.mode == OPUS_MODE_HYBRID && consumed + 37 <= size * 8)
redundancy = opus_rc_p2model(&s->rc, 12);
else if (s->packet.mode == OPUS_MODE_SILK && consumed + 17 <= size * 8)
redundancy = 1;
if (redundancy) {
redundancy_pos = opus_rc_p2model(&s->rc, 1);
if (s->packet.mode == OPUS_MODE_HYBRID)
redundancy_size = opus_rc_unimodel(&s->rc, 256) + 2;
else
redundancy_size = size - (consumed + 7) / 8;
size -= redundancy_size;
if (size < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid redundancy frame size.\n");
return AVERROR_INVALIDDATA;
}
if (redundancy_pos) {
ret = opus_decode_redundancy(s, data + size, redundancy_size);
if (ret < 0)
return ret;
ff_celt_flush(s->celt);
}
}
/* decode the CELT frame */
if (s->packet.mode == OPUS_MODE_CELT || s->packet.mode == OPUS_MODE_HYBRID) {
float *out_tmp[2] = { s->out[0], s->out[1] };
float **dst = (s->packet.mode == OPUS_MODE_CELT) ?
out_tmp : s->celt_output;
int celt_output_samples = samples;
int delay_samples = av_audio_fifo_size(s->celt_delay);
if (delay_samples) {
if (s->packet.mode == OPUS_MODE_HYBRID) {
av_audio_fifo_read(s->celt_delay, (void**)s->celt_output, delay_samples);
for (i = 0; i < s->output_channels; i++) {
s->fdsp->vector_fmac_scalar(out_tmp[i], s->celt_output[i], 1.0,
delay_samples);
out_tmp[i] += delay_samples;
}
celt_output_samples -= delay_samples;
} else {
av_log(s->avctx, AV_LOG_WARNING,
"Spurious CELT delay samples present.\n");
av_audio_fifo_drain(s->celt_delay, delay_samples);
if (s->avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_BUG;
}
}
opus_raw_init(&s->rc, data + size, size);
ret = ff_celt_decode_frame(s->celt, &s->rc, dst,
s->packet.stereo + 1,
s->packet.frame_duration,
(s->packet.mode == OPUS_MODE_HYBRID) ? 17 : 0,
celt_band_end[s->packet.bandwidth]);
if (ret < 0)
return ret;
if (s->packet.mode == OPUS_MODE_HYBRID) {
int celt_delay = s->packet.frame_duration - celt_output_samples;
void *delaybuf[2] = { s->celt_output[0] + celt_output_samples,
s->celt_output[1] + celt_output_samples };
for (i = 0; i < s->output_channels; i++) {
s->fdsp->vector_fmac_scalar(out_tmp[i],
s->celt_output[i], 1.0,
celt_output_samples);
}
ret = av_audio_fifo_write(s->celt_delay, delaybuf, celt_delay);
if (ret < 0)
return ret;
}
} else
ff_celt_flush(s->celt);
if (s->redundancy_idx) {
for (i = 0; i < s->output_channels; i++)
opus_fade(s->out[i], s->out[i],
s->redundancy_output[i] + 120 + s->redundancy_idx,
ff_celt_window2 + s->redundancy_idx, 120 - s->redundancy_idx);
s->redundancy_idx = 0;
}
if (redundancy) {
if (!redundancy_pos) {
ff_celt_flush(s->celt);
ret = opus_decode_redundancy(s, data + size, redundancy_size);
if (ret < 0)
return ret;
for (i = 0; i < s->output_channels; i++) {
opus_fade(s->out[i] + samples - 120 + delayed_samples,
s->out[i] + samples - 120 + delayed_samples,
s->redundancy_output[i] + 120,
ff_celt_window2, 120 - delayed_samples);
if (delayed_samples)
s->redundancy_idx = 120 - delayed_samples;
}
} else {
for (i = 0; i < s->output_channels; i++) {
memcpy(s->out[i] + delayed_samples, s->redundancy_output[i], 120 * sizeof(float));
opus_fade(s->out[i] + 120 + delayed_samples,
s->redundancy_output[i] + 120,
s->out[i] + 120 + delayed_samples,
ff_celt_window2, 120);
}
}
}
return samples;
}
static int opus_decode_subpacket(OpusStreamContext *s,
const uint8_t *buf, int buf_size,
int nb_samples)
{
int output_samples = 0;
int flush_needed = 0;
int i, j, ret;
/* check if we need to flush the resampler */
if (avresample_is_open(s->avr)) {
if (buf) {
int64_t cur_samplerate;
av_opt_get_int(s->avr, "in_sample_rate", 0, &cur_samplerate);
flush_needed = (s->packet.mode == OPUS_MODE_CELT) || (cur_samplerate != s->silk_samplerate);
} else {
flush_needed = !!s->delayed_samples;
}
}
if (!buf && !flush_needed)
return 0;
/* use dummy output buffers if the channel is not mapped to anything */
if (!s->out[0] ||
(s->output_channels == 2 && !s->out[1])) {
av_fast_malloc(&s->out_dummy, &s->out_dummy_allocated_size, s->out_size);
if (!s->out_dummy)
return AVERROR(ENOMEM);
if (!s->out[0])
s->out[0] = s->out_dummy;
if (!s->out[1])
s->out[1] = s->out_dummy;
}
/* flush the resampler if necessary */
if (flush_needed) {
ret = opus_flush_resample(s, s->delayed_samples);
if (ret < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Error flushing the resampler.\n");
return ret;
}
avresample_close(s->avr);
output_samples += s->delayed_samples;
s->delayed_samples = 0;
if (!buf)
goto finish;
}
/* decode all the frames in the packet */
for (i = 0; i < s->packet.frame_count; i++) {
int size = s->packet.frame_size[i];
int samples = opus_decode_frame(s, buf + s->packet.frame_offset[i], size);
if (samples < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Error decoding an Opus frame.\n");
if (s->avctx->err_recognition & AV_EF_EXPLODE)
return samples;
for (j = 0; j < s->output_channels; j++)
memset(s->out[j], 0, s->packet.frame_duration * sizeof(float));
samples = s->packet.frame_duration;
}
output_samples += samples;
for (j = 0; j < s->output_channels; j++)
s->out[j] += samples;
s->out_size -= samples * sizeof(float);
}
finish:
s->out[0] = s->out[1] = NULL;
s->out_size = 0;
return output_samples;
}
static int opus_decode_packet(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
OpusContext *c = avctx->priv_data;
AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int coded_samples = 0;
int decoded_samples = 0;
int i, ret;
/* decode the header of the first sub-packet to find out the sample count */
if (buf) {
OpusPacket *pkt = &c->streams[0].packet;
ret = ff_opus_parse_packet(pkt, buf, buf_size, c->nb_streams > 1);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error parsing the packet header.\n");
return ret;
}
coded_samples += pkt->frame_count * pkt->frame_duration;
c->streams[0].silk_samplerate = get_silk_samplerate(pkt->config);
}
frame->nb_samples = coded_samples + c->streams[0].delayed_samples;
/* no input or buffered data => nothing to do */
if (!frame->nb_samples) {
*got_frame_ptr = 0;
return 0;
}
/* setup the data buffers */
ret = ff_get_buffer(avctx, frame, 0);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
frame->nb_samples = 0;
for (i = 0; i < avctx->channels; i++) {
ChannelMap *map = &c->channel_maps[i];
if (!map->copy)
c->streams[map->stream_idx].out[map->channel_idx] = (float*)frame->extended_data[i];
}
for (i = 0; i < c->nb_streams; i++)
c->streams[i].out_size = frame->linesize[0];
/* decode each sub-packet */
for (i = 0; i < c->nb_streams; i++) {
OpusStreamContext *s = &c->streams[i];
if (i && buf) {
ret = ff_opus_parse_packet(&s->packet, buf, buf_size, i != c->nb_streams - 1);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error parsing the packet header.\n");
return ret;
}
s->silk_samplerate = get_silk_samplerate(s->packet.config);
}
ret = opus_decode_subpacket(&c->streams[i], buf,
s->packet.data_size, coded_samples);
if (ret < 0)
return ret;
if (decoded_samples && ret != decoded_samples) {
av_log(avctx, AV_LOG_ERROR, "Different numbers of decoded samples "
"in a multi-channel stream\n");
return AVERROR_INVALIDDATA;
}
decoded_samples = ret;
buf += s->packet.packet_size;
buf_size -= s->packet.packet_size;
}
for (i = 0; i < avctx->channels; i++) {
ChannelMap *map = &c->channel_maps[i];
/* handle copied channels */
if (map->copy) {
memcpy(frame->extended_data[i],
frame->extended_data[map->copy_idx],
frame->linesize[0]);
} else if (map->silence) {
memset(frame->extended_data[i], 0, frame->linesize[0]);
}
if (c->gain_i) {
c->fdsp.vector_fmul_scalar((float*)frame->extended_data[i],
(float*)frame->extended_data[i],
c->gain, FFALIGN(decoded_samples, 8));
}
}
frame->nb_samples = decoded_samples;
*got_frame_ptr = !!decoded_samples;
return avpkt->size;
}
static av_cold void opus_decode_flush(AVCodecContext *ctx)
{
OpusContext *c = ctx->priv_data;
int i;
for (i = 0; i < c->nb_streams; i++) {
OpusStreamContext *s = &c->streams[i];
memset(&s->packet, 0, sizeof(s->packet));
s->delayed_samples = 0;
if (s->celt_delay)
av_audio_fifo_drain(s->celt_delay, av_audio_fifo_size(s->celt_delay));
avresample_close(s->avr);
ff_silk_flush(s->silk);
ff_celt_flush(s->celt);
}
}
static av_cold int opus_decode_close(AVCodecContext *avctx)
{
OpusContext *c = avctx->priv_data;
int i;
for (i = 0; i < c->nb_streams; i++) {
OpusStreamContext *s = &c->streams[i];
ff_silk_free(&s->silk);
ff_celt_free(&s->celt);
av_freep(&s->out_dummy);
s->out_dummy_allocated_size = 0;
av_audio_fifo_free(s->celt_delay);
avresample_free(&s->avr);
}
av_freep(&c->streams);
c->nb_streams = 0;
av_freep(&c->channel_maps);
return 0;
}
static av_cold int opus_decode_init(AVCodecContext *avctx)
{
OpusContext *c = avctx->priv_data;
int ret, i, j;
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
avctx->sample_rate = 48000;
avpriv_float_dsp_init(&c->fdsp, 0);
/* find out the channel configuration */
ret = ff_opus_parse_extradata(avctx, c);
if (ret < 0)
return ret;
/* allocate and init each independent decoder */
c->streams = av_mallocz_array(c->nb_streams, sizeof(*c->streams));
if (!c->streams) {
c->nb_streams = 0;
ret = AVERROR(ENOMEM);
goto fail;
}
for (i = 0; i < c->nb_streams; i++) {
OpusStreamContext *s = &c->streams[i];
uint64_t layout;
s->output_channels = (i < c->nb_stereo_streams) ? 2 : 1;
s->avctx = avctx;
for (j = 0; j < s->output_channels; j++) {
s->silk_output[j] = s->silk_buf[j];
s->celt_output[j] = s->celt_buf[j];
s->redundancy_output[j] = s->redundancy_buf[j];
}
s->fdsp = &c->fdsp;
s->avr = avresample_alloc_context();
if (!s->avr)
goto fail;
layout = (s->output_channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
av_opt_set_int(s->avr, "in_sample_fmt", avctx->sample_fmt, 0);
av_opt_set_int(s->avr, "out_sample_fmt", avctx->sample_fmt, 0);
av_opt_set_int(s->avr, "in_channel_layout", layout, 0);
av_opt_set_int(s->avr, "out_channel_layout", layout, 0);
av_opt_set_int(s->avr, "out_sample_rate", avctx->sample_rate, 0);
ret = ff_silk_init(avctx, &s->silk, s->output_channels);
if (ret < 0)
goto fail;
ret = ff_celt_init(avctx, &s->celt, s->output_channels);
if (ret < 0)
goto fail;
s->celt_delay = av_audio_fifo_alloc(avctx->sample_fmt,
s->output_channels, 1024);
if (!s->celt_delay) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
return 0;
fail:
opus_decode_close(avctx);
return ret;
}
AVCodec ff_opus_decoder = {
.name = "opus",
.long_name = NULL_IF_CONFIG_SMALL("Opus"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_OPUS,
.priv_data_size = sizeof(OpusContext),
.init = opus_decode_init,
.close = opus_decode_close,
.decode = opus_decode_packet,
.flush = opus_decode_flush,
.capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
};
libavcodec/version.h
浏览文件 @ b70d7a4a
......@@ -29,8 +29,8 @@
#include "libavutil/version.h"
#define LIBAVCODEC_VERSION_MAJOR 55
#define LIBAVCODEC_VERSION_MINOR 50
#define LIBAVCODEC_VERSION_MICRO 3
#define LIBAVCODEC_VERSION_MINOR 51
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \
......
tests/Makefile
浏览文件 @ b70d7a4a
......@@ -93,6 +93,7 @@ include $(SRC_PATH)/tests/fate/microsoft.mak
include $(SRC_PATH)/tests/fate/monkeysaudio.mak
include $(SRC_PATH)/tests/fate/mp3.mak
include $(SRC_PATH)/tests/fate/mpc.mak
include $(SRC_PATH)/tests/fate/opus.mak
include $(SRC_PATH)/tests/fate/pcm.mak
include $(SRC_PATH)/tests/fate/probe.mak
include $(SRC_PATH)/tests/fate/prores.mak
......
tests/fate/opus.mak 0 → 100644
浏览文件 @ b70d7a4a
# The samples were produced by simply rewrapping the official test vectors from
# their custom format into Matroska.
# The reference files were created with our decoder and tested against the
# libopus output with the official opus_compare tool. We cannot use libopus
# output as reference directly, because the use of different resamplers would
# require too high fuzz values, which can hide bugs.
# Before adding new tests here, always make sure they pass opus_compare.
OPUS_CELT_SAMPLES = $(addprefix testvector, 01 07 11) tron.6ch.tinypkts
OPUS_HYBRID_SAMPLES = $(addprefix testvector, 05 06)
OPUS_SILK_SAMPLES = $(addprefix testvector, 02 03 04)
OPUS_SAMPLES = $(addprefix testvector, 08 09 10 12)
define FATE_OPUS_TEST
FATE_OPUS += fate-opus-$(1)
FATE_OPUS$(2) += fate-opus-$(1)
fate-opus-$(1): CMD = avconv -i $(TARGET_SAMPLES)/opus/$(1).mka -f f32le -
fate-opus-$(1): REF = $(TARGET_SAMPLES)/opus/$(1).f32
endef
$(foreach N,$(OPUS_CELT_SAMPLES), $(eval $(call FATE_OPUS_TEST,$(N),_CELT)))
$(foreach N,$(OPUS_HYBRID_SAMPLES),$(eval $(call FATE_OPUS_TEST,$(N),_HYBRID)))
$(foreach N,$(OPUS_SILK_SAMPLES), $(eval $(call FATE_OPUS_TEST,$(N),_SILK)))
$(foreach N,$(OPUS_SAMPLES), $(eval $(call FATE_OPUS_TEST,$(N),)))
FATE_OPUS := $(sort $(FATE_OPUS))
$(FATE_OPUS): CMP = stddev
$(FATE_OPUS): CMP_UNIT = f32
$(FATE_OPUS): FUZZ = 3
$(FATE_OPUS_CELT): CMP = oneoff
$(FATE_OPUS_CELT): FUZZ = 5
FATE_SAMPLES_AVCONV-$(call DEMDEC, MATROSKA, OPUS) += $(FATE_OPUS)
fate-opus-celt: $(FATE_OPUS_CELT)
fate-opus-hybrid: $(FATE_OPUS_HYBRID)
fate-opus-silk: $(FATE_OPUS_SILK)
fate-opus: $(FATE_OPUS)
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