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Code Issues Releases Activity

avformat/matroskadec: Add support for FlagTextDescriptions

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This is the equivalent of the WebM "D_WEBVTT/DESCRIPTIONS" and is
therefore only exported for subtitles.

Reviewed-by: Ridley Combs <rcombs@rcombs.me>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2021-02-16 19:38:19 +01:00
parent f9ceb18f3b
commit 48cf1d878c
2 changed files with 7 additions and 1 deletions

1
libavformat/matroska.h

@ -100,6 +100,7 @@
#define MATROSKA_ID_TRACKFLAGFORCED 0x55AA
#define MATROSKA_ID_TRACKFLAGHEARINGIMPAIRED 0x55AB
#define MATROSKA_ID_TRACKFLAGVISUALIMPAIRED 0x55AC
#define MATROSKA_ID_TRACKFLAGTEXTDESCRIPTIONS 0x55AD
#define MATROSKA_ID_TRACKFLAGCOMMENTARY 0x55AF
#define MATROSKA_ID_TRACKFLAGLACING 0x9C
#define MATROSKA_ID_TRACKMINCACHE 0x6DE7

7
libavformat/matroskadec.c

@ -253,6 +253,7 @@ typedef struct MatroskaTrack {
uint64_t flag_comment;
uint64_t flag_hearingimpaired;
uint64_t flag_visualimpaired;
uint64_t flag_textdescriptions;
uint64_t seek_preroll;
MatroskaTrackVideo video;
MatroskaTrackAudio audio;
@ -412,7 +413,7 @@ typedef struct MatroskaDemuxContext {
// incomplete type (6.7.2 in C90, 6.9.2 in C99).
// Removing the sizes breaks MSVC.
static EbmlSyntax ebml_syntax[3], matroska_segment[9], matroska_track_video_color[15], matroska_track_video[19],
matroska_track[30], matroska_track_encoding[6], matroska_track_encodings[2],
matroska_track[31], matroska_track_encoding[6], matroska_track_encodings[2],
matroska_track_combine_planes[2], matroska_track_operation[2], matroska_tracks[2],
matroska_attachments[2], matroska_chapter_entry[9], matroska_chapter[6], matroska_chapters[2],
matroska_index_entry[3], matroska_index[2], matroska_tag[3], matroska_tags[2], matroska_seekhead[2],
@ -579,6 +580,7 @@ static EbmlSyntax matroska_track[] = {
{ MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
{ MATROSKA_ID_TRACKFLAGHEARINGIMPAIRED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_hearingimpaired), { .u = 0 } },
{ MATROSKA_ID_TRACKFLAGVISUALIMPAIRED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_visualimpaired), { .u = 0 } },
{ MATROSKA_ID_TRACKFLAGTEXTDESCRIPTIONS, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_textdescriptions), { .u = 0 } },
{ MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
{ MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
{ MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
@ -2880,6 +2882,9 @@ static int matroska_parse_tracks(AVFormatContext *s)
}
} else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
if (track->flag_textdescriptions)
st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
}
}