Function ffmpeg_seek_ts

libhb/stream.c:6609–6650

Assumes that we are always seeking forward

// Assumes that we are always seeking forward
static int ffmpeg_seek_ts( hb_stream_t *stream, int64_t ts )
{
    AVFormatContext *ic = stream->ffmpeg_ic;
    int64_t pos;
    int ret;

    // Find the initial chapter we have seeked into
    int count = hb_list_count(stream->title->list_chapter);
    if (count > 0)
    {
        int64_t        sum_dur = 0;
        hb_chapter_t * chapter;
        int            ii;
        for (ii = 0; ii < count; ii++)
        {
            chapter = hb_list_item( stream->title->list_chapter, ii );
            if (sum_dur + chapter->duration > ts)
            {
                break;
            }
            sum_dur += chapter->duration;
        }
        stream->chapter     = ii;
        stream->chapter_end = sum_dur;
    }
    else
    {
        stream->chapter     = 0;
        stream->chapter_end = INT64_MAX;
    }

    pos = ts * AV_TIME_BASE / 90000 + ffmpeg_initial_timestamp( stream );
    AVStream *st = stream->ffmpeg_ic->streams[stream->ffmpeg_video_id];
    // timebase must be adjusted to match timebase of stream we are
    // using for seeking.
    pos = av_rescale(pos, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num);
    stream->need_keyframe = 1;
    // Seek to the nearest timestamp before that requested where
    // there is an I-frame
    ret = avformat_seek_file( ic, stream->ffmpeg_video_id, 0, pos, pos, 0);
    return ret;
}