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LibVideo: Calculate Block timestamps for Matroska according to spec

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Tracks have a timestamp scale value that should be present which scales
each block's timestamp offset to allow video to be synced with audio.
They should also contain a CodecDelay element and may also contain a
TrackOffset that offsets the block timestamps.
This commit is contained in:
Zaggy1024 2022-11-12 13:09:07 -06:00 • committed by Andreas Kling
parent ceb7632862
commit a58bf7c3d1
4 changed files with 49 additions and 12 deletions
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9
Userland/Libraries/LibVideo/Containers/Matroska/Document.h
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@ -114,6 +114,12 @@ public:
void set_language(FlyString const& language) { m_language = language; }
FlyString codec_id() const { return m_codec_id; }
void set_codec_id(FlyString const& codec_id) { m_codec_id = codec_id; }
double timestamp_scale() const { return m_timestamp_scale; }
void set_timestamp_scale(double timestamp_scale) { m_timestamp_scale = timestamp_scale; }
u64 codec_delay() const { return m_codec_delay; }
void set_codec_delay(u64 codec_delay) { m_codec_delay = codec_delay; }
u64 timestamp_offset() const { return m_timestamp_offset; }
void set_timestamp_offset(u64 timestamp_offset) { m_timestamp_offset = timestamp_offset; }
Optional<VideoTrack> video_track() const
{
if (track_type() != Video)
@ -135,6 +141,9 @@ private:
TrackType m_track_type { Invalid };
FlyString m_language = "eng";
FlyString m_codec_id;
double m_timestamp_scale { 1 };
u64 m_codec_delay { 0 };
u64 m_timestamp_offset { 0 };
union {
VideoTrack m_video_track {};