[FFmpeg-devel] [PATCH 2/2] matroska: Demux support for SeekPreRoll and CodecDelay

Michael Niedermayer michaelni at gmx.at
Mon Oct 14 18:55:00 CEST 2013


On Fri, Oct 11, 2013 at 11:47:38AM -0700, Vignesh Venkatasubramanian wrote:
> Adds support for demuxing SeekPreRoll and CodecDelay container
> elements.
> 
> Signed-off-by: Vignesh Venkatasubramanian <vigneshv at google.com>
> ---
>  libavformat/matroskadec.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
> index 1879328..b07db9d 100644
> --- a/libavformat/matroskadec.c
> +++ b/libavformat/matroskadec.c
> @@ -163,6 +163,8 @@ typedef struct {
>      uint64_t default_duration;
>      uint64_t flag_default;
>      uint64_t flag_forced;
> +    uint64_t codec_delay;
> +    uint64_t seek_preroll;
>      MatroskaTrackVideo video;
>      MatroskaTrackAudio audio;
>      MatroskaTrackOperation operation;
> @@ -410,6 +412,8 @@ static EbmlSyntax matroska_track[] = {
>      { MATROSKA_ID_TRACKOPERATION,       EBML_NEST, 0, offsetof(MatroskaTrack,operation), {.n=matroska_track_operation} },
>      { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
>      { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_UINT, 0, offsetof(MatroskaTrack,max_block_additional_id) },
> +    { MATROSKA_ID_CODECDELAY,           EBML_UINT, 0, offsetof(MatroskaTrack,codec_delay) },
> +    { MATROSKA_ID_SEEKPREROLL,          EBML_UINT, 0, offsetof(MatroskaTrack,seek_preroll) },
>      { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
>      { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
>      { MATROSKA_ID_CODECNAME,            EBML_NONE },
> @@ -1881,6 +1885,16 @@ static int matroska_read_header(AVFormatContext *s)
>              st->codec->bits_per_coded_sample = track->audio.bitdepth;
>              if (st->codec->codec_id != AV_CODEC_ID_AAC)
>              st->need_parsing = AVSTREAM_PARSE_HEADERS;
> +            if (track->codec_delay > 0) {
> +                st->codec->delay = av_rescale_q(track->codec_delay,
> +                                                (AVRational){1, 1000000000},
> +                                                (AVRational){1, st->codec->sample_rate});
> +            }
> +            if (track->seek_preroll > 0) {
> +                st->codec->seek_preroll = av_rescale_q(track->seek_preroll,
> +                                                       (AVRational){1, 1000000000},
> +                                                       (AVRational){1, st->codec->sample_rate});

being outside libavcdoec this needs to use the setter function

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The greatest way to live with honor in this world is to be what we pretend
to be. -- Socrates
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