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matroskaenc: Add support for writing chapters.

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patch by Anton Khirnov  wyskas _at_ gmail _dot_ com

Originally committed as revision 20277 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Anton Khirnov 2009-10-18 12:17:01 +00:00 committed by Aurelien Jacobs
parent 15674f12be
commit 2bd0758efa
1 changed files with 47 additions and 0 deletions
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47
libavformat/matroskaenc.c
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@ -619,6 +619,50 @@ static int mkv_write_tracks(AVFormatContext *s)
return 0;
}
static int mkv_write_chapters(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = s->pb;
ebml_master chapters, editionentry;
AVRational scale = {1, 1E9};
int i, ret;
if (!s->nb_chapters)
return 0;
ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, url_ftell(pb));
if (ret < 0) return ret;
chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
for (i = 0; i < s->nb_chapters; i++) {
ebml_master chapteratom, chapterdisplay;
AVChapter *c = s->chapters[i];
AVMetadataTag *t = NULL;
chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
av_rescale_q(c->start, c->time_base, scale));
put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
av_rescale_q(c->end, c->time_base, scale));
put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
if ((t = av_metadata_get(c->metadata, "title", NULL, 0))) {
chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
end_ebml_master(pb, chapterdisplay);
}
end_ebml_master(pb, chapteratom);
}
end_ebml_master(pb, editionentry);
end_ebml_master(pb, chapters);
return 0;
}
static int mkv_write_header(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
@ -678,6 +722,9 @@ static int mkv_write_header(AVFormatContext *s)
ret = mkv_write_tracks(s);
if (ret < 0) return ret;
ret = mkv_write_chapters(s);
if (ret < 0) return ret;
ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
if (ret < 0) return ret;