Skip to content

F
FFmpeg

TrueDei / FFmpeg

通知 1
Star 0
Fork 0
F
FFmpeg

体验新版 GitCode，发现更多精彩内容 >>

提交 f61dee2f 编写于 作者: P Peter Ross 提交者： Ronald S. Bultje
浏览文件
操作

wtv: filesystem implementation 

Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>
上级 a9d921cb
隐藏空白更改
内联 并排
Showing with 564 addition and 78 deletion
libavformat/wtv.c
浏览文件 @ f61dee2f
/*
* Windows Television (WTV) demuxer
* Copyright (c) 2010 Peter Ross <pross@xvid.org>
* Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
*
* This file is part of FFmpeg.
*
......@@ -26,6 +26,7 @@
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat_readwrite.h"
#include "avformat.h"
#include "riff.h"
#include "asf.h"
......@@ -37,22 +38,294 @@
#define ARG_GUID(g) \
g[0],g[1],g[2],g[3],g[4],g[5],g[6],g[7],g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
#define PRI_PRETTY_GUID \
"%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
#define ARG_PRETTY_GUID(g) \
AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
#define LEN_PRETTY_GUID 34
/*
*
* File system routines
*
*/
#define WTV_SECTOR_BITS 12
#define WTV_SECTOR_SIZE (1 << WTV_SECTOR_BITS)
#define WTV_BIGSECTOR_BITS 18
typedef struct {
int seen_data;
} WtvStream;
ByteIOContext *pb_filesystem; /** file system (AVFormatContext->pb) */
typedef struct WtvContext {
uint64_t pts;
} WtvContext;
int sector_bits; /** sector shift bits; used to convert sector number into pb_filesystem offset */
uint32_t *sectors; /** file allocation table */
int nb_sectors; /** number of sectors */
int error;
int64_t position;
int64_t length;
} WtvFile;
/**
* @return bytes read, 0 on end of file, or <0 on error
*/
static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
{
WtvFile *wf = opaque;
ByteIOContext *pb = wf->pb_filesystem;
int nread = 0;
if (wf->error || url_ferror(pb))
return -1;
if (wf->position >= wf->length || url_feof(pb))
return 0;
buf_size = FFMIN(buf_size, wf->length - wf->position);
while(nread < buf_size) {
int n;
int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
int read_request = FFMIN(buf_size - nread, remaining_in_sector);
n = get_buffer(pb, buf, read_request);
if (n <= 0)
break;
nread += n;
buf += n;
wf->position += n;
if (n == remaining_in_sector) {
int i = wf->position >> wf->sector_bits;
if (i >= wf->nb_sectors ||
(wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
url_fseek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
wf->error = 1;
break;
}
}
}
return nread;
}
/**
* @return position (or file length)
*/
static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
{
WtvFile *wf = opaque;
ByteIOContext *pb = wf->pb_filesystem;
if (whence == AVSEEK_SIZE)
return wf->length;
else if (whence == SEEK_CUR)
offset = wf->position + offset;
else if (whence == SEEK_END)
offset = wf->length;
wf->error = offset < 0 || offset >= wf->length ||
url_fseek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
+ (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
wf->position = offset;
return offset;
}
/**
* read non-zero integers (le32) from input stream
* @param pb
* @param[out] data destination
* @param count maximum number of integers to read
* @return total number of integers read
*/
static int read_ints(ByteIOContext *pb, uint32_t *data, int count)
{
int i, total = 0;
for (i = 0; i < count; i++) {
if ((data[total] = get_le32(pb)))
total++;
}
return total;
}
/**
* Open file
* @param first_sector First sector
* @param length Length of file (bytes)
* @param depth File allocation table depth
* @return NULL on error
*/
static ByteIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
{
ByteIOContext *pb;
WtvFile *wf;
uint8_t *buffer;
if (url_fseek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
return NULL;
wf = av_mallocz(sizeof(WtvFile));
if (!wf)
return NULL;
if (depth == 0) {
wf->sectors = av_malloc(sizeof(uint32_t));
if (!wf->sectors) {
av_free(wf);
return NULL;
}
wf->sectors[0] = first_sector;
wf->nb_sectors = 1;
wf->sector_bits = WTV_SECTOR_BITS;
} else if (depth == 1) {
wf->sectors = av_malloc(WTV_SECTOR_SIZE);
if (!wf->sectors) {
av_free(wf);
return NULL;
}
wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
} else if (depth == 2) {
uint32_t sectors1[WTV_SECTOR_SIZE / 4];
int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
int i;
wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
if (!wf->sectors) {
av_free(wf);
return NULL;
}
wf->nb_sectors = 0;
for (i = 0; i < nb_sectors1; i++) {
if (url_fseek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
break;
wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
}
wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
} else {
av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
av_free(wf);
return NULL;
}
if (!wf->nb_sectors) {
av_free(wf->sectors);
av_free(wf);
return NULL;
}
/* check length */
length &= 0xFFFFFFFFFFFF;
if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);
length = (int64_t)wf->nb_sectors << wf->sector_bits;
}
wf->length = length;
/* seek to intial sector */
wf->position = 0;
if (url_fseek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
av_free(wf->sectors);
av_free(wf);
return NULL;
}
wf->pb_filesystem = s->pb;
buffer = av_malloc(1 << wf->sector_bits);
if (!buffer) {
av_free(wf->sectors);
av_free(wf);
return NULL;
}
static int is_zero(uint8_t *v, int n)
pb = av_alloc_put_byte(buffer, 1 << wf->sector_bits, 0, wf,
wtvfile_read_packet, NULL, wtvfile_seek);
if (!pb) {
av_free(buffer);
av_free(wf->sectors);
av_free(wf);
}
return pb;
}
static const ff_asf_guid dir_entry_guid =
{0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
/**
* Open file using filename
* @param[in] buf directory buffer
* @param buf_size directory buffer size
* @param[in] filename
* @param filename_size size of filename
* @return NULL on error
*/
static ByteIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
{
int i;
for (i = 0; i < n; i++)
if (v[i]) return 0;
return 1;
const uint8_t *buf_end = buf + buf_size;
while(buf + 48 <= buf_end) {
int dir_length, name_size, first_sector, depth;
uint64_t file_length;
const uint8_t *name;
if (ff_guidcmp(buf, dir_entry_guid)) {
av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
"remaining directory entries ignored\n", ARG_GUID(buf));
break;
}
dir_length = AV_RL16(buf + 16);
file_length = AV_RL64(buf + 24);
name_size = 2 * AV_RL32(buf + 32);
if (buf + 48 + name_size > buf_end) {
av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
break;
}
first_sector = AV_RL32(buf + 40 + name_size);
depth = AV_RL32(buf + 44 + name_size);
/* compare file name; test optional null terminator */
name = buf + 40;
if (name_size >= filename_size &&
!memcmp(name, filename, filename_size) &&
(name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
return wtvfile_open_sector(first_sector, file_length, depth, s);
buf += dir_length;
}
return 0;
}
#define wtvfile_open(s, buf, buf_size, filename) \
wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
/**
* Close file opened with wtvfile_open_sector(), or wtv_open()
*/
static void wtvfile_close(ByteIOContext *pb)
{
WtvFile *wf = pb->opaque;
av_free(wf->sectors);
av_free(pb);
}
/*
*
* Main demuxer
*
*/
typedef struct {
int seen_data;
} WtvStream;
typedef struct {
ByteIOContext *pb; /** timeline file */
int64_t epoch;
int64_t pts; /** pts for next data chunk */
int64_t last_valid_pts; /** latest valid pts, used for interative seeking */
/* maintain private seek index, as the AVIndexEntry->pos is relative to the
start of the 'timeline' file, not the file system (AVFormatContext->pb) */
AVIndexEntry *index_entries;
int nb_index_entries;
unsigned int index_entries_allocated_size;
} WtvContext;
typedef struct {
enum CodecID id;
ff_asf_guid guid;
......@@ -71,7 +344,7 @@ static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid g
/* WTV GUIDs */
static const ff_asf_guid wtv_guid =
{0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
static const ff_asf_guid meta_guid =
static const ff_asf_guid metadata_guid =
{0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
static const ff_asf_guid timestamp_guid =
{0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
......@@ -158,13 +431,152 @@ static int read_probe(AVProbeData *p)
return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
}
/**
* Convert win32 FILETIME to ISO-8601 string
*/
static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
{
time_t t = (value / 10000000LL) - 11644473600LL;
strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
}
/**
* Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
*/
static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
{
time_t t = (value / 10000000LL) - 719162LL*86400LL;
strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
}
/**
* Convert OLE DATE to ISO-8601 string
*/
static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
{
time_t t = 631112400LL + 86400*av_int2dbl(value);
strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
}
static void get_attachment(AVFormatContext *s, ByteIOContext *pb, int length)
{
char mime[1024];
char description[1024];
unsigned int filesize;
AVStream *st;
int64_t pos = url_ftell(pb);
avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
if (strcmp(mime, "image/jpeg"))
goto done;
get_byte(pb);
avio_get_str16le(pb, INT_MAX, description, sizeof(description));
filesize = get_le32(pb);
if (!filesize)
goto done;
st = av_new_stream(s, 0);
if (!st)
goto done;
av_metadata_set2(&st->metadata, "title", description, 0);
st->codec->codec_id = CODEC_ID_MJPEG;
st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
st->codec->extradata = av_mallocz(filesize);
if (!st->codec->extradata)
goto done;
st->codec->extradata_size = filesize;
get_buffer(pb, st->codec->extradata, filesize);
done:
url_fseek(pb, pos + length, SEEK_SET);
}
static void get_tag(AVFormatContext *s, ByteIOContext *pb, const char *key, int type, int length)
{
int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
char *buf = av_malloc(buf_size);
if (!buf)
return;
if (type == 0 && length == 4) {
snprintf(buf, buf_size, "%"PRIi32, get_le32(pb));
} else if (type == 1) {
avio_get_str16le(pb, length, buf, buf_size);
if (!strlen(buf)) {
av_free(buf);
return;
}
} else if (type == 3 && length == 4) {
strcpy(buf, get_le32(pb) ? "true" : "false");
} else if (type == 4 && length == 8) {
int64_t num = get_le64(pb);
if (!strcmp(key, "WM/EncodingTime") ||
!strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
filetime_to_iso8601(buf, buf_size, num);
else if (!strcmp(key, "WM/WMRVEncodeTime") ||
!strcmp(key, "WM/WMRVEndTime"))
crazytime_to_iso8601(buf, buf_size, num);
else if (!strcmp(key, "WM/WMRVExpirationDate"))
oledate_to_iso8601(buf, buf_size, num);
else if (!strcmp(key, "WM/WMRVBitrate"))
snprintf(buf, buf_size, "%f", av_int2dbl(num));
else
snprintf(buf, buf_size, "%"PRIi64, num);
} else if (type == 5 && length == 2) {
snprintf(buf, buf_size, "%"PRIi16, get_le16(pb));
} else if (type == 6 && length == 16) {
ff_asf_guid guid;
get_buffer(pb, guid, 16);
snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
} else if (type == 2 && !strcmp(key, "WM/Picture")) {
get_attachment(s, pb, length);
av_freep(&buf);
return;
} else {
av_freep(&buf);
av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
url_fskip(pb, length);
return;
}
av_metadata_set2(&s->metadata, key, buf, 0);
av_freep(&buf);
}
/**
* Parse metadata entries
*/
static void parse_legacy_attrib(AVFormatContext *s, ByteIOContext *pb)
{
ff_asf_guid guid;
int length, type;
while(!url_feof(pb)) {
char key[1024];
ff_get_guid(pb, &guid);
type = get_le32(pb);
length = get_le32(pb);
if (!length)
break;
if (ff_guidcmp(&guid, metadata_guid)) {
av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
"remaining metadata entries ignored\n", ARG_GUID(guid));
break;
}
avio_get_str16le(pb, INT_MAX, key, sizeof(key));
get_tag(s, pb, key, type, length);
}
ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
}
/**
* parse VIDEOINFOHEADER2 structure
* @return bytes consumed
*/
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
{
ByteIOContext *pb = s->pb;
WtvContext *wtv = s->priv_data;
ByteIOContext *pb = wtv->pb;
url_fskip(pb, 72); // picture aspect ratio is unreliable
ff_get_bmp_header(pb, st);
......@@ -233,7 +645,8 @@ static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
ff_asf_guid mediatype, ff_asf_guid subtype,
ff_asf_guid formattype, int size)
{
ByteIOContext *pb = s->pb;
WtvContext *wtv = s->priv_data;
ByteIOContext *pb = wtv->pb;
if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
!ff_guidcmp(formattype, format_cpfilters_processed)) {
ff_asf_guid actual_subtype;
......@@ -339,32 +752,25 @@ static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
enum {
SEEK_TO_DATA = 0,
SEEK_TO_BYTE,
SEEK_TO_PTS,
};
/**
* Parse WTV chunks
* @param mode SEEK_TO_DATA, SEEK_TO_BYTE, SEEK_TO_PTS
* @param seekts either byte position or timestamp
* @param mode SEEK_TO_DATA or SEEK_TO_PTS
* @param seekts timestamp
* @param[out] len Length of data chunk
* @return stream index of data chunk, or <0 on error
*/
static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
{
WtvContext *wtv = s->priv_data;
ByteIOContext *pb = s->pb;
ByteIOContext *pb = wtv->pb;
while (!url_feof(pb)) {
ff_asf_guid g;
int len, sid, consumed;
if (mode == SEEK_TO_BYTE && url_ftell(pb) >= seekts)
return 0;
ff_get_guid(pb, &g);
if (is_zero(g, sizeof(ff_asf_guid)))
return AVERROR_EOF;
len = get_le32(pb);
if (len < 32)
break;
......@@ -458,11 +864,16 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
consumed += 16;
if (wtv->pts == -1)
wtv->pts = AV_NOPTS_VALUE;
else {
wtv->last_valid_pts = wtv->pts;
if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
wtv->epoch = wtv->pts;
if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
#define WTV_PAD8(x) (((x) + 7) & ~7)
url_fskip(pb, WTV_PAD8(len) - consumed);
return 0;
}
}
}
} else if (!ff_guidcmp(g, data_guid)) {
int stream_index = ff_find_stream_index(s, sid);
......@@ -472,8 +883,6 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
if (len_ptr) {
*len_ptr = len;
}
if (wtv->pts != AV_NOPTS_VALUE)
av_add_index_entry(s->streams[stream_index], url_ftell(pb) - consumed, wtv->pts, 0, 0, AVINDEX_KEYFRAME);
return stream_index;
}
} else if (
......@@ -505,26 +914,114 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
return AVERROR_EOF;
}
#define WTV_CHUNK_START 0x40000
/* declare utf16le strings */
#define _ , 0,
static const uint8_t timeline_le16[] =
{'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
static const uint8_t table_0_entries_legacy_attrib_le16[] =
{'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
static const uint8_t table_0_entries_time_le16[] =
{'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
static const uint8_t timeline_table_0_entries_Events_le16[] =
{'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e'_'.'_'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'E'_'v'_'e'_'n'_'t'_'s', 0};
#undef _
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
{
ByteIOContext *pb = s->pb;
WtvContext *wtv = s->priv_data;
int root_sector, root_size;
uint8_t root[WTV_SECTOR_SIZE];
ByteIOContext *pb;
int64_t timeline_pos;
int ret;
url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
wtv->epoch =
wtv->pts =
wtv->last_valid_pts = AV_NOPTS_VALUE;
/* read root directory sector */
url_fskip(s->pb, 0x30);
root_size = get_le32(s->pb);
if (root_size > sizeof(root)) {
av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
return AVERROR_INVALIDDATA;
}
url_fskip(s->pb, 4);
root_sector = get_le32(s->pb);
url_fseek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
root_size = get_buffer(s->pb, root, root_size);
if (root_size < 0)
return AVERROR_INVALIDDATA;
/* parse chunks up until first data chunk */
wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
if (!wtv->pb) {
av_log(s, AV_LOG_ERROR, "timeline data missing\n");
return AVERROR_INVALIDDATA;
}
ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
if (ret < 0)
return ret;
url_fseek(wtv->pb, -32, SEEK_CUR);
timeline_pos = url_ftell(s->pb); // save before opening another file
/* read metadata */
pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
if (pb) {
parse_legacy_attrib(s, pb);
wtvfile_close(pb);
}
/* read seek index */
if (s->nb_streams) {
AVStream *st = s->streams[0];
pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
if (pb) {
while(1) {
uint64_t timestamp = get_le64(pb);
uint64_t frame_nb = get_le64(pb);
if (url_feof(pb))
break;
ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
}
wtvfile_close(pb);
url_fseek(pb, -32, SEEK_CUR);
if (wtv->nb_index_entries) {
pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
if (pb) {
int i;
while (1) {
uint64_t frame_nb = get_le64(pb);
uint64_t position = get_le64(pb);
if (url_feof(pb))
break;
for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
AVIndexEntry *e = wtv->index_entries + i;
if (frame_nb > e->size)
break;
if (position > e->pos)
e->pos = position;
}
}
wtvfile_close(pb);
st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
}
}
}
}
url_fseek(s->pb, timeline_pos, SEEK_SET);
return 0;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
WtvContext *wtv = s->priv_data;
ByteIOContext *pb = s->pb;
ByteIOContext *pb = wtv->pb;
int stream_index, len, ret;
stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
......@@ -540,59 +1037,47 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
return 0;
}
static int read_seek2(AVFormatContext *s, int stream_index,
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
static int read_seek(AVFormatContext *s, int stream_index,
int64_t ts, int flags)
{
WtvContext *wtv = s->priv_data;
ByteIOContext *pb = s->pb;
AVStream *st;
ByteIOContext *pb = wtv->pb;
AVStream *st = s->streams[0];
int64_t ts_relative;
int i;
if (stream_index < 0) {
stream_index = av_find_default_stream_index(s);
if (stream_index < 0)
return -1;
}
st = s->streams[stream_index];
if ((flags & AVSEEK_FLAG_FRAME)) {
if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
return AVERROR_NOTSUPP;
} else if ((flags & AVSEEK_FLAG_BYTE)) {
if (ts < url_ftell(pb)) {
for (i = st->nb_index_entries - 1; i >= 0; i--) {
if (st->index_entries[i].pos <= ts) {
wtv->pts = st->index_entries[i].timestamp;
url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
break;
}
}
if (i < 0) {
wtv->pts = 0;
url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
}
}
if (parse_chunks(s, SEEK_TO_BYTE, ts, 0) < 0)
/* timestamp adjustment is required because wtv->pts values are absolute,
* whereas AVIndexEntry->timestamp values are relative to epoch. */
ts_relative = ts;
if (wtv->epoch != AV_NOPTS_VALUE)
ts_relative -= wtv->epoch;
i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
if (i < 0) {
if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
url_fseek(pb, 0, SEEK_SET);
else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
url_fseek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
return AVERROR(ERANGE);
return 0;
} else {
ts *= 10;
i = av_index_search_timestamp(st, ts, flags);
if (i < 0) {
if (st->nb_index_entries > 0) {
wtv->pts = st->index_entries[st->nb_index_entries - 1].timestamp;
url_fseek(pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET);
} else {
wtv->pts = 0;
url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
}
if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
return AVERROR(ERANGE);
return 0;
}
wtv->pts = st->index_entries[i].timestamp;
url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
return 0;
}
wtv->pts = wtv->index_entries[i].timestamp;
if (wtv->epoch != AV_NOPTS_VALUE)
wtv->pts += wtv->epoch;
wtv->last_valid_pts = wtv->pts;
url_fseek(pb, wtv->index_entries[i].pos, SEEK_SET);
return 0;
}
static int read_close(AVFormatContext *s)
{
WtvContext *wtv = s->priv_data;
wtvfile_close(wtv->pb);
return 0;
}
AVInputFormat ff_wtv_demuxer = {
......@@ -602,6 +1087,7 @@ AVInputFormat ff_wtv_demuxer = {
.read_probe = read_probe,
.read_header = read_header,
.read_packet = read_packet,
.read_seek2 = read_seek2,
.flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
.read_seek = read_seek,
.read_close = read_close,
.flags = AVFMT_SHOW_IDS,
};
Markdown is supported
0% 或 .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑！
想要评论请 注册 或