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lavf/subtitles: seek a little more backward when necessary.

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If some previous subtitles are overlapping with the current time
we make sure they are raised so the renderer can display them too.
This commit is contained in:
Clément Bœsch 2012-11-30 07:00:59 +01:00
parent ff3624b1ad
commit ad5d72b123
1 changed files with 11 additions and 0 deletions
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11
libavformat/subtitles.c
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@ -103,6 +103,7 @@ int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int st
} else {
int i, idx = -1;
int64_t min_ts_diff = INT64_MAX;
int64_t ts_selected;
if (stream_index == -1) {
AVRational time_base = s->streams[0]->time_base;
ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
@ -124,6 +125,16 @@ int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int st
}
if (idx < 0)
return AVERROR(ERANGE);
/* look back in the latest subtitles for overlapping subtitles */
ts_selected = q->subs[idx].pts;
for (i = idx - 1; i >= 0; i--) {
if (q->subs[i].duration <= 0)
continue;
if (q->subs[i].pts > ts_selected - q->subs[i].duration)
idx = i;
else
break;
}
q->current_sub_idx = idx;
}
return 0;