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avformat/matroskaenc: Allow to set multiple streams as default

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The Matroska specifications have evolved and now allow to mark
multiple tracks of the same kind as default (whether this was legal or
not before was dubious; e.g. mkvmerge disallowed it). Yet when the
Matroska muxer is set to infer default dispositions if absent, it also
enforced the now outdated restriction. So update this.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2021-08-20 07:50:44 +02:00
parent ff02a42394
commit beb60abab5
3 changed files with 14 additions and 18 deletions
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16
libavformat/matroskaenc.c
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@@ -1395,7 +1395,8 @@ static int mkv_write_tracks(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *pb = s->pb;
int i, ret, video_default_idx, audio_default_idx, subtitle_default_idx;
int video_default_idx = -1, audio_default_idx = -1, subtitle_default_idx = -1;
int i, ret;
if (mkv->nb_attachments == s->nb_streams)
return 0;
@@ -1405,11 +1406,7 @@ static int mkv_write_tracks(AVFormatContext *s)
return ret;
if (mkv->default_mode != DEFAULT_MODE_PASSTHROUGH) {
int video_idx, audio_idx, subtitle_idx;
video_idx = video_default_idx =
audio_idx = audio_default_idx =
subtitle_idx = subtitle_default_idx = -1;
int video_idx = -1, audio_idx = -1, subtitle_idx = -1;
for (i = s->nb_streams - 1; i >= 0; i--) {
AVStream *st = s->streams[i];
@@ -1435,8 +1432,7 @@ static int mkv_write_tracks(AVFormatContext *s)
}
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
int is_default = mkv->default_mode == DEFAULT_MODE_PASSTHROUGH ?
st->disposition & AV_DISPOSITION_DEFAULT :
int is_default = st->disposition & AV_DISPOSITION_DEFAULT ||
i == video_default_idx || i == audio_default_idx ||
i == subtitle_default_idx;
ret = mkv_write_track(s, mkv, st, &mkv->tracks[i],
@@ -2823,8 +2819,8 @@ static const AVOption options[] = {
{ "flipped_raw_rgb", "Raw RGB bitmaps in VFW mode are stored bottom-up", OFFSET(flipped_raw_rgb), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
{ "default_mode", "Controls how a track's FlagDefault is inferred", OFFSET(default_mode), AV_OPT_TYPE_INT, { .i64 = DEFAULT_MODE_INFER }, DEFAULT_MODE_INFER, DEFAULT_MODE_PASSTHROUGH, FLAGS, "default_mode" },
{ "infer", "For each track type, mark the first track of disposition default as default; if none exists, mark the first track as default.", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_INFER }, 0, 0, FLAGS, "default_mode" },
{ "infer_no_subs", "For each track type, mark the first track of disposition default as default; for audio and video: if none exists, mark the first track as default.", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_INFER_NO_SUBS }, 0, 0, FLAGS, "default_mode" },
{ "infer", "For each track type, mark each track of disposition default as default; if none exists, mark the first track as default.", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_INFER }, 0, 0, FLAGS, "default_mode" },
{ "infer_no_subs", "For each track type, mark each track of disposition default as default; for audio and video: if none exists, mark the first track as default.", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_INFER_NO_SUBS }, 0, 0, FLAGS, "default_mode" },
{ "passthrough", "Use the disposition flag as-is", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_PASSTHROUGH }, 0, 0, FLAGS, "default_mode" },
{ NULL },
};