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matroska: modify chapter limits by join_diff

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When adding or removing frames to avoid 1-frame seeks on chapter
boundaries, the end of the chapter needs to be pushed or pulled by the
same amount to keep the intended end frame the same.
This commit is contained in:
Ben Boeckel 2013-10-14 18:51:03 -04:00
parent 67eb187826
commit e80fd3f9e1
1 changed files with 23 additions and 9 deletions
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32
mpvcore/timeline/tl_matroska.c
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@ -299,13 +299,13 @@ static int find_ordered_chapter_sources(struct MPContext *mpctx,
return *num_sources;
}
static void add_timeline_part(struct MPOpts *opts,
struct demuxer *source,
struct timeline_part **timeline,
int *part_count,
uint64_t start,
uint64_t *last_end_time,
uint64_t *starttime)
static int64_t add_timeline_part(struct MPOpts *opts,
struct demuxer *source,
struct timeline_part **timeline,
int *part_count,
uint64_t start,
uint64_t *last_end_time,
uint64_t *starttime)
{
/* Only add a separate part if the time or file actually changes.
* Matroska files have chapter divisions that are redundant from
@ -331,7 +331,10 @@ static void add_timeline_part(struct MPOpts *opts,
mp_msg(MSGT_CPLAYER, MSGL_V, "Merging timeline part %d with "
"offset %g ms.\n", *part_count, join_diff / 1e6);
*starttime += join_diff;
return join_diff;
}
return 0;
}
static void build_timeline_loop(struct MPOpts *opts,
@ -388,8 +391,19 @@ static void build_timeline_loop(struct MPOpts *opts,
/* If we're the source or it's a non-ordered edition reference,
* just add a timeline part from the source. */
if (current_source == j || !linked_m->num_ordered_chapters) {
add_timeline_part(opts, linked_source, timeline, part_count,
c->start, last_end_time, starttime);
int64_t join_diff = add_timeline_part(opts, linked_source, timeline, part_count,
c->start, last_end_time, starttime);
/* If we merged two chapters into a single part due to them
* being off by a few frames, we need to change the limit to
* avoid chopping the end of the intended chapter (the adding
* frames case) or showing extra content (the removing frames
* case). Also update chapter_length to incorporate the extra
* time. */
if (limit) {
limit += join_diff;
chapter_length += join_diff;
}
/* Otherwise, we have an ordered edition as the source. Since this
* can jump around all over the place, we need to build up the
* timeline parts for each of its chapters, but not add them as