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matroskadec: read the CodecDelay element

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This commit is contained in:
Anton Khirnov 2014-04-29 12:03:13 +02:00
parent 7d027b9d6d
commit eb3b5501e8
2 changed files with 10 additions and 1 deletions
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1
libavformat/matroska.h
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@ -86,6 +86,7 @@
#define MATROSKA_ID_CODECINFOURL 0x3B4040
#define MATROSKA_ID_CODECDOWNLOADURL 0x26B240
#define MATROSKA_ID_CODECDECODEALL 0xAA
#define MATROSKA_ID_CODECDELAY 0x56AA
#define MATROSKA_ID_TRACKNAME 0x536E
#define MATROSKA_ID_TRACKLANGUAGE 0x22B59C
#define MATROSKA_ID_TRACKFLAGENABLED 0xB9

10
libavformat/matroskadec.c
View File

@ -44,6 +44,7 @@
#include "libavutil/intfloat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/lzo.h"
#include "libavutil/mathematics.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/mpeg4audio.h"
@ -154,6 +155,7 @@ typedef struct {
MatroskaTrackVideo video;
MatroskaTrackAudio audio;
EbmlList encodings;
uint64_t codec_delay;
AVStream *stream;
int64_t end_timecode;
@ -354,6 +356,7 @@ static EbmlSyntax matroska_track[] = {
{ MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) },
{ MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) },
{ MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
{ MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
{ MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
{ MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
{ MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
@ -1730,6 +1733,11 @@ static int matroska_read_header(AVFormatContext *s)
avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
1000 * 1000 * 1000); /* 64 bit pts in ns */
/* convert the delay from ns to the track timebase */
track->codec_delay = av_rescale_q(track->codec_delay,
(AVRational){ 1, 1000000000 },
st->time_base);
st->codec->codec_id = codec_id;
st->start_time = 0;
if (strcmp(track->language, "und"))
@ -2269,7 +2277,7 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
if (cluster_time != (uint64_t) -1 &&
(block_time >= 0 || cluster_time >= -block_time)) {
timecode = cluster_time + block_time;
timecode = cluster_time + block_time - track->codec_delay;
if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
timecode < track->end_timecode)
is_keyframe = 0; /* overlapping subtitles are not key frame */