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lavf/matroska: Adding the new SeekPreRoll element

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In order to encapsuate Opus in Matroska, there is a new element
that has been added to the Matroska Spec, SeekPreRoll. It has the
duration in nanoseconds that has to be decoded before every seek.
Spec: http://matroska.org/technical/specs/index.html#SeekPreRoll
Proposal for encapsulateing Opus in Matroska:
http://wiki.xiph.org/MatroskaOpus

Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Vignesh Venkatasubramanian 2013-08-16 11:08:06 -07:00 committed by Michael Niedermayer
parent 6e4b9b8a2f
commit 571efd9729
2 changed files with 8 additions and 0 deletions
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1
libavformat/matroska.h
View File

@ -91,6 +91,7 @@
#define MATROSKA_ID_CODECINFOURL 0x3B4040
#define MATROSKA_ID_CODECDOWNLOADURL 0x26B240
#define MATROSKA_ID_CODECDECODEALL 0xAA
#define MATROSKA_ID_SEEKPREROLL 0x56BB
#define MATROSKA_ID_TRACKNAME 0x536E
#define MATROSKA_ID_TRACKLANGUAGE 0x22B59C
#define MATROSKA_ID_TRACKFLAGENABLED 0xB9

7
libavformat/matroskaenc.c
View File

@ -121,6 +121,9 @@ typedef struct MatroskaMuxContext {
/** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
#define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
/** Seek preroll value for opus */
#define OPUS_SEEK_PREROLL 80000000
static int ebml_id_size(unsigned int id)
{
@ -642,6 +645,10 @@ static int mkv_write_tracks(AVFormatContext *s)
}
}
if (codec->codec_id == AV_CODEC_ID_OPUS) {
put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
}
if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
codec->codec_id == AV_CODEC_ID_VP9 ||
((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||