diff options
author | Clément Bœsch <ubitux@gmail.com> | 2012-11-24 00:40:46 +0400 |
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committer | Clément Bœsch <ubitux@gmail.com> | 2012-12-02 03:06:03 +0400 |
commit | ff3624b1ad9dc4374c9adf7ba65ac3ed6d05c0e5 (patch) | |
tree | 28584a27b9fa6278fda392c1ca7bf1d3d0191300 /libavformat/subtitles.c | |
parent | b684f744ac1e4c5cbd6ac91d2be6098e1b122288 (diff) |
lavf/subtitles: add ff_subtitles_queue_seek().
This function is almost identical to lavf/assdec:read_seek2(). It
performs a generic seek for text subtitles demuxers for the new seeking
API.
The only difference with assdec:read_seek2 is the ts_diff being
unsigned to avoid overflows.
The seek callback in the ASS demuxer will be removed when it is
redesigned to use FFDemuxSubtitlesQueue.
Diffstat (limited to 'libavformat/subtitles.c')
-rw-r--r-- | libavformat/subtitles.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/libavformat/subtitles.c b/libavformat/subtitles.c index 12045262eb..290eaa02aa 100644 --- a/libavformat/subtitles.c +++ b/libavformat/subtitles.c @@ -91,6 +91,44 @@ int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt) return 0; } +int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index, + int64_t min_ts, int64_t ts, int64_t max_ts, int flags) +{ + if (flags & AVSEEK_FLAG_BYTE) { + return AVERROR(ENOSYS); + } else if (flags & AVSEEK_FLAG_FRAME) { + if (ts < 0 || ts >= q->nb_subs) + return AVERROR(ERANGE); + q->current_sub_idx = ts; + } else { + int i, idx = -1; + int64_t min_ts_diff = INT64_MAX; + if (stream_index == -1) { + AVRational time_base = s->streams[0]->time_base; + ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base); + min_ts = av_rescale_rnd(min_ts, time_base.den, + time_base.num * (int64_t)AV_TIME_BASE, + AV_ROUND_UP); + max_ts = av_rescale_rnd(max_ts, time_base.den, + time_base.num * (int64_t)AV_TIME_BASE, + AV_ROUND_DOWN); + } + /* TODO: q->subs[] is sorted by pts so we could do a binary search */ + for (i = 0; i < q->nb_subs; i++) { + int64_t pts = q->subs[i].pts; + uint64_t ts_diff = FFABS(pts - ts); + if (pts >= min_ts && pts <= max_ts && ts_diff < min_ts_diff) { + min_ts_diff = ts_diff; + idx = i; + } + } + if (idx < 0) + return AVERROR(ERANGE); + q->current_sub_idx = idx; + } + return 0; +} + void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q) { int i; |