AIFF format support by (Patrick Guimond <patg a.t patg d.o.t homeunix d.o.t org)

Originally committed as revision 4924 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -33,6 +33,7 @@ version <next>
 - CamStudio video decoder
 - build system improvements
 - tabs and trailing whitespace removed from the codebase
+- AIFF/AIFF-C audio format, encoding and decoding
 
 version 0.4.9-pre1:
 

libavformat/Makefile

@@ -22,7 +22,7 @@ OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o img2.o raw.o rm.o \
       yuv4mpeg.o 4xm.o flvdec.o psxstr.o idroq.o ipmovie.o \
       nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o flic.o \
       sierravmd.o matroska.o sol.o electronicarts.o nsvdec.o asf.o \
-      ogg2.o oggparsevorbis.o oggparsetheora.o oggparseflac.o daud.o
+      ogg2.o oggparsevorbis.o oggparsetheora.o oggparseflac.o daud.o aiff.o
 
 # muxers
 ifeq ($(CONFIG_MUXERS),yes)

libavformat/aiff.c

+/*
+ * AIFF/AIFF-C encoder and decoder
+ * Copyright (c) 2006  Patrick Guimond
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include "avformat.h"
+#include "avi.h"
+#include "intfloat_readwrite.h"
+
+const CodecTag codec_aiff_tags[] = {
+    { CODEC_ID_PCM_S16BE, MKTAG('N','O','N','E') },
+    { CODEC_ID_PCM_S8, MKTAG('N','O','N','E') },
+    { CODEC_ID_PCM_S24BE, MKTAG('N','O','N','E') },
+    { CODEC_ID_PCM_S32BE, MKTAG('N','O','N','E') },
+    { CODEC_ID_PCM_ALAW, MKTAG('a','l','a','w') },
+    { CODEC_ID_PCM_ALAW, MKTAG('A','L','A','W') },
+    { CODEC_ID_PCM_MULAW, MKTAG('u','l','a','w') },
+    { CODEC_ID_PCM_MULAW, MKTAG('U','L','A','W') },
+    { CODEC_ID_MACE3, MKTAG('M','A','C','3') },
+    { CODEC_ID_MACE6, MKTAG('M','A','C','6') },
+    { CODEC_ID_GSM, MKTAG('G','S','M',' ') },
+    { CODEC_ID_ADPCM_G726, MKTAG('G','7','2','6') },
+    { 0, 0 },
+};
+
+#define AIFF                    0
+#define AIFF_C_VERSION1         0xA2805140
+
+static int aiff_codec_get_id (int bps)
+{
+    if (bps <= 8)
+        return CODEC_ID_PCM_S8;
+    if (bps <= 16)
+        return CODEC_ID_PCM_S16BE;
+    if (bps <= 24)
+        return CODEC_ID_PCM_S24BE;
+    if (bps <= 32)
+        return CODEC_ID_PCM_S32BE;
+
+    /* bigger than 32 isn't allowed  */
+    return 0;
+}
+
+/* returns the size of the found tag */
+static int get_tag(ByteIOContext *pb, uint32_t * tag)
+{
+    int size;
+
+    if (url_feof(pb))
+        return AVERROR_IO;
+
+    *tag = get_le32(pb);
+    size = get_be32(pb);
+
+    if (size < 0)
+        size = 0x7fffffff;
+
+    return size;
+}
+
+/* Metadata string read */
+static void get_meta(ByteIOContext *pb, char * str, int strsize, int size)
+{
+    int res;
+
+    if (size > strsize-1)
+        res = get_buffer(pb, (uint8_t*)str, strsize-1);
+    else
+        res = get_buffer(pb, (uint8_t*)str, size);
+
+    if (res < 0)
+        return;
+
+    str[res] = 0;
+    if (size & 1)
+        size++;
+    size -= res;
+    if (size);
+        url_fskip(pb, size);
+}
+
+/* Returns the number of bits per second */
+static int fix_bps(int codec_id)
+{
+    switch (codec_id) {
+        case CODEC_ID_PCM_S8:
+                return 8;
+        case CODEC_ID_PCM_S16BE:
+                return 16;
+        case CODEC_ID_PCM_S24BE:
+                return 24;
+        case CODEC_ID_PCM_S32BE:
+                return 32;
+    }
+
+    return -1;
+}
+
+/* Returns the number of sound data frames or negative on error */
+unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
+                             int size, unsigned version)
+{
+    AVExtFloat ext;
+    double sample_rate;
+    unsigned int num_frames;
+
+
+    if (size & 1)
+        size++;
+
+    codec->codec_type = CODEC_TYPE_AUDIO;
+    codec->channels = get_be16(pb);
+    num_frames = get_be32(pb);
+    codec->bits_per_sample = get_be16(pb);
+
+    get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
+    sample_rate = av_ext2dbl(ext);          /* 80 bits BE IEEE extended float */
+    codec->sample_rate = sample_rate;
+    size -= 18;
+
+    /* Got an AIFF-C? */
+    if (version == AIFF_C_VERSION1) {
+        codec->codec_tag = get_le32(pb);
+        codec->codec_id  = codec_get_id (codec_aiff_tags, codec->codec_tag);
+
+        if (codec->codec_id == CODEC_ID_PCM_S16BE) {
+            codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
+            codec->bits_per_sample = fix_bps(codec->codec_id);
+        }
+
+        size -= 4;
+    } else {
+        /* Need the codec type */
+        codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
+        codec->bits_per_sample = fix_bps(codec->codec_id);
+    }
+
+    if (!codec->codec_id)
+        return AVERROR_INVALIDDATA;
+
+    /* Block align needs to be computed in all cases, as the definition
+     * is specific to applications -> here we use the WAVE format definition */
+    codec->block_align = (codec->bits_per_sample * codec->channels) >> 3;
+
+    codec->bit_rate = codec->sample_rate * codec->block_align;
+
+    /* Chunk is over */
+    if (size)
+        url_fseek(pb, size, SEEK_CUR);
+
+    return num_frames;
+}
+
+#ifdef CONFIG_MUXERS
+typedef struct {
+    offset_t form;
+    offset_t frames;
+    offset_t ssnd;
+} AIFFOutputContext;
+
+static int aiff_write_header(AVFormatContext *s)
+{
+    AIFFOutputContext *aiff = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    AVCodecContext *enc = s->streams[0]->codec;
+    AVExtFloat sample_rate;
+    int coder_len;
+
+    /* First verify if format is ok */
+    enc->codec_tag = codec_get_tag(codec_aiff_tags, enc->codec_id);
+    if (!enc->codec_tag) {
+        av_free(aiff);
+        return -1;
+    }
+
+    coder_len = strlen(enc->codec->name);
+
+    /* FORM AIFF header */
+    put_tag(pb, "FORM");
+    aiff->form = url_ftell(pb);
+    put_be32(pb, 0);                    /* file length */
+    put_tag(pb, "AIFC");
+
+    /* Version chunk */
+    put_tag(pb, "FVER");
+    put_be32(pb, 4);
+    put_be32(pb, 0xA2805140);
+
+    /* Common chunk */
+    put_tag(pb, "COMM");
+    if (coder_len & 1)                  /* Common chunk is of var size */
+        put_be32(pb, 23+coder_len);
+    else
+        put_be32(pb, 24+coder_len);
+    put_be16(pb, enc->channels);        /* Number of channels */
+
+    aiff->frames = url_ftell(pb);
+    put_be32(pb, 0);                    /* Number of frames */
+
+    if (!enc->bits_per_sample)
+        enc->bits_per_sample = (enc->block_align<<3) / enc->channels;
+    put_be16(pb, enc->bits_per_sample); /* Sample size */
+
+    sample_rate = av_dbl2ext((double)enc->sample_rate);
+    put_buffer(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
+
+    put_le32(pb, enc->codec_tag);
+    if (coder_len & 1) {
+        put_byte(pb, coder_len);
+        put_buffer(pb, (uint8_t*)enc->codec->name, coder_len);
+    } else {
+        put_byte(pb, coder_len+1);
+        put_buffer(pb, (uint8_t*)enc->codec->name, coder_len);
+        put_byte(pb, 0);
+    }
+
+    /* Sound data chunk */
+    put_tag(pb, "SSND");
+    aiff->ssnd = url_ftell(pb);         /* Sound chunk size */
+    put_be32(pb, 0);                    /* Sound samples data size */
+    put_be32(pb, 0);                    /* Data offset */
+    put_be32(pb, 0);                    /* Block-size (block align) */
+
+    av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
+
+    /* Data is starting here */
+    put_flush_packet(pb);
+
+    return 0;
+}
+
+static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    ByteIOContext *pb = &s->pb;
+    put_buffer(pb, pkt->data, pkt->size);
+    return 0;
+}
+
+static int aiff_write_trailer(AVFormatContext *s)
+{
+    ByteIOContext *pb = &s->pb;
+    AIFFOutputContext *aiff = s->priv_data;
+    AVCodecContext *enc = s->streams[0]->codec;
+
+    /* Chunks sizes must be even */
+    offset_t file_size, end_size;
+    end_size = file_size = url_ftell(pb);
+    if (file_size & 1) {
+        put_byte(pb, 0);
+        end_size++;
+    }
+
+    if (!url_is_streamed(&s->pb)) {
+        /* File length */
+        url_fseek(pb, aiff->form, SEEK_SET);
+        put_be32(pb, (uint32_t)(file_size - aiff->form - 4));
+
+        /* Number of sample frames */
+        url_fseek(pb, aiff->frames, SEEK_SET);
+        put_be32(pb, ((uint32_t)(file_size-aiff->ssnd-12))/enc->block_align);
+
+        /* Sound Data chunk size */
+        url_fseek(pb, aiff->ssnd, SEEK_SET);
+        put_be32(pb, (uint32_t)(file_size - aiff->ssnd - 4));
+
+        /* return to the end */
+        url_fseek(pb, end_size, SEEK_SET);
+
+        put_flush_packet(pb);
+    }
+
+    return 0;
+}
+#endif //CONFIG_MUXERS
+
+static int aiff_probe(AVProbeData *p)
+{
+    /* check file header */
+    if (p->buf_size < 16)
+        return 0;
+    if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
+        p->buf[2] == 'R' && p->buf[3] == 'M' &&
+        p->buf[8] == 'A' && p->buf[9] == 'I' &&
+        p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+/* aiff input */
+static int aiff_read_header(AVFormatContext *s,
+                            AVFormatParameters *ap)
+{
+    int size, filesize, offset;
+    uint32_t tag;
+    unsigned version = AIFF_C_VERSION1;
+    ByteIOContext *pb = &s->pb;
+    AVStream * st = s->streams[0];
+
+    /* check FORM header */
+    filesize = get_tag(pb, &tag);
+    if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
+        return AVERROR_INVALIDDATA;
+
+    /* AIFF data type */
+    tag = get_le32(pb);
+    if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
+        version = AIFF;
+    else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
+        return AVERROR_INVALIDDATA;
+
+    filesize -= 4;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+
+    while (filesize > 0) {
+        /* parse different chunks */
+        size = get_tag(pb, &tag);
+        if (size < 0)
+            return size;
+
+        filesize -= size + 8;
+
+        switch (tag) {
+            case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
+                /* Then for the complete header info */
+                st->nb_frames = get_aiff_header (pb, st->codec, size, version);
+                if (st->nb_frames < 0)
+                        return st->nb_frames;
+                break;
+
+            case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
+                version = get_be32(pb);
+                break;
+
+            case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
+                get_meta (pb, s->title, sizeof(s->title), size);
+                break;
+
+            case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
+                get_meta (pb, s->author, sizeof(s->author), size);
+                break;
+
+            case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
+                get_meta (pb, s->copyright, sizeof(s->copyright), size);
+                break;
+
+            case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
+                get_meta (pb, s->comment, sizeof(s->comment), size);
+                break;
+
+            case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
+                get_be32(pb);               /* Block align... don't care */
+                offset = get_be32(pb);      /* Offset of sound data */
+                goto got_sound;
+
+            default: /* Jump */
+                if (size & 1)   /* Always even aligned */
+                    size++;
+                url_fskip (pb, size);
+        }
+    }
+
+    /* End of loop and didn't get sound */
+    return AVERROR_INVALIDDATA;
+
+got_sound:
+    /* Now positioned, get the sound data start and end */
+    if (st->nb_frames)
+        s->file_size = st->nb_frames * st->codec->block_align;
+
+    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
+    st->start_time = 0;
+    st->duration = st->nb_frames;
+
+    /* Position the stream at the first block */
+    url_fskip(pb, offset);
+
+    return 0;
+}
+
+#define MAX_SIZE 4096
+
+static int aiff_read_packet(AVFormatContext *s,
+                            AVPacket *pkt)
+{
+    offset_t pos;
+    int res, size;
+
+    /* End of stream may be reached */
+    if (url_feof(&s->pb))
+        return AVERROR_IO;
+
+    /* Need to know if reached the end sound data */
+    size = MAX_SIZE;
+    if (s->file_size) {
+        pos = url_ftell (&s->pb) - s->file_size;
+        if (pos >= s->file_size)
+            size = 0;
+        else if (pos + MAX_SIZE >= s->file_size)
+            size = s->file_size - pos;
+    }
+
+    /* Now for that packet */
+    res = av_get_packet (&s->pb, pkt, MAX_SIZE);
+    if (res < 0)
+        return res;
+
+    /* Only one stream in an AIFF file */
+    pkt->stream_index = 0;
+
+    /* Finaly fix the read to a block */
+    if (size <= res)
+        pkt->size = size - (size % s->streams[0]->codec->block_align);
+    else
+        pkt->size = res - (res % s->streams[0]->codec->block_align);
+
+    return 0;
+}
+
+static int aiff_read_close(AVFormatContext *s)
+{
+    return 0;
+}
+
+static int aiff_read_seek(AVFormatContext *s,
+                          int stream_index, int64_t timestamp, int flags)
+{
+    return pcm_read_seek(s, stream_index, timestamp, flags);
+}
+
+
+static AVInputFormat aiff_iformat = {
+    "aiff",
+    "Audio IFF",
+    0,
+    aiff_probe,
+    aiff_read_header,
+    aiff_read_packet,
+    aiff_read_close,
+    aiff_read_seek,
+};
+
+#ifdef CONFIG_MUXERS
+static AVOutputFormat aiff_oformat = {
+    "aiff",
+    "Audio IFF",
+    "audio/aiff",
+    "aif,aiff,afc,aifc",
+    sizeof(AIFFOutputContext),
+    CODEC_ID_PCM_S16BE,
+    CODEC_ID_NONE,
+    aiff_write_header,
+    aiff_write_packet,
+    aiff_write_trailer,
+};
+#endif //CONFIG_MUXERS
+
+int ff_aiff_init(void)
+{
+    av_register_input_format(&aiff_iformat);
+#ifdef CONFIG_MUXERS
+    av_register_output_format(&aiff_oformat);
+#endif //CONFIG_MUXERS
+    return 0;
+}
+

libavformat/allformats.c

@@ -54,6 +54,7 @@ void av_register_all(void)
     ff_mmf_init();
     swf_init();
     au_init();
+    ff_aiff_init();
 #ifdef CONFIG_MUXERS
     gif_init();
 #endif //CONFIG_MUXERS

libavformat/avformat.h

@@ -549,6 +549,9 @@ int nsvdec_init(void);
 /* daud.c */
 int daud_init(void);
 
+/* aiff.c */
+int ff_aiff_init(void);
+
 #include "rtp.h"
 
 #include "rtsp.h"

libavutil/intfloat_readwrite.c

@@ -38,6 +38,23 @@ float av_int2flt(int32_t v){
     return ldexp(((v&0x7FFFFF) + (1<<23)) * (v>>31|1), (v>>23&0xFF)-150);
 }
 
+double av_ext2dbl(const AVExtFloat ext){
+    uint64_t m = 0;
+    int e, i;
+
+    for (i = 0; i < 8; i++)
+        m |= (uint64_t)ext.mantissa[i]<<(56-(i<<3));
+    e = (((int)ext.exponent[0]&0x7f)<<8) | ext.exponent[1];
+    if (e == 0x7fff && m)
+        return 0.0/0.0;
+    e -= 16383 + 63;        /* In IEEE 80 bits, the whole (i.e. 1.xxxx)
+                             * mantissa bit is written as opposed to the
+                             * single and double precision formats */
+    if (ext.exponent[0]&0x80)
+        return ldexp(-m, e);
+    return ldexp(m, e);
+}
+
 int64_t av_dbl2int(double d){
     int e;
     if     ( !d) return 0;
@@ -53,3 +70,29 @@ int32_t av_flt2int(float d){
     d= frexp(d, &e);
     return (d<0)<<31 | (e+126)<<23 | (int64_t)((fabs(d)-0.5)*(1<<24));
 }
+
+AVExtFloat av_dbl2ext(double d){
+    struct AVExtFloat ext;
+    int e, i; double f; uint64_t m;
+
+    f = fabs(frexp(d, &e));
+    if (f >= 0.5 && f < 1) {
+        e += 16382;
+        ext.exponent[0] = e>>8;
+        ext.exponent[1] = e;
+        m = (uint64_t)ldexp(f, 64);
+        for (i=0; i < 8; i++)
+            ext.mantissa[i] = m>>(56-(i<<3));
+    } else if (f == 0.0) {
+        memset (&ext, 0, 10);
+    } else {
+        ext.exponent[0] = 0x7f; ext.exponent[1] = 0xff;
+        memset (&ext.mantissa, 0, 8);
+        if (f != 1/0.0)
+            ext.mantissa[0] = ~0;
+    }
+    if (d < 0)
+        ext.exponent[0] |= 0x80;
+    return ext;
+}
+

libavutil/intfloat_readwrite.h

@@ -3,9 +3,17 @@
 
 #include "common.h"
 
+/* IEEE 80 bits extended float */
+typedef struct AVExtFloat  {
+    uint8_t exponent[2];
+    uint8_t mantissa[8];
+} AVExtFloat;
+
 double av_int2dbl(int64_t v);
 float av_int2flt(int32_t v);
+double av_ext2dbl(const AVExtFloat ext);
 int64_t av_dbl2int(double d);
 int32_t av_flt2int(float d);
+AVExtFloat av_dbl2ext(double d);
 
 #endif /* INTFLOAT_READWRITE_H */

tests/libav.regression.ref

@@ -62,6 +62,9 @@ e2a6d6fae17394dfe87cb5bb8ae11837 *./data/b-libav.al
 20f9fa55b3c5bebe3520f5667ee4928b *./data/b-libav.mmf
   22609 ./data/b-libav.mmf
 ./data/b-libav.mmf CRC=0x7e78cffe
+a324baee6d76c53ab7c74616cfc31616 *./data/b-libav.aif
+  89168 ./data/b-libav.aif
+./data/b-libav.aif CRC=0x2a09519c
 ce356ce2708cb6033ab5d762da93cfd4 *./data/b-libav-yuv420p.yuv
  304128 ./data/b-libav-yuv420p.yuv
 ce356ce2708cb6033ab5d762da93cfd4 *./data/b-libav-yuv422p.yuv

tests/regression.sh

@@ -696,6 +696,11 @@ file=${outfile}libav.mmf
 do_ffmpeg $file -t 1 -y -qscale 10 -f s16le -i $pcm_src $file
 do_ffmpeg_crc $file -i $file
 
+# aiff
+file=${outfile}libav.aif
+do_ffmpeg $file -t 1 -y -qscale 10 -f s16le -i $pcm_src $file
+do_ffmpeg_crc $file -i $file
+
 ####################
 # pix_fmt conversions
 conversions="yuv420p yuv422p yuv444p yuv422 yuv410p yuv411p yuvj420p \