Function fixAudioOverlap

libhb/sync.c:1111–1160

Fix audio overlaps that could not be corrected with dejitter

// Fix audio overlaps that could not be corrected with dejitter
static void fixAudioOverlap( sync_stream_t * stream )
{
    int           drop = 0;
    int64_t       overlap;
    hb_buffer_t * buf;

    if (!stream->first_frame)
    {
        // There are no overlaps if we haven't seen the first frame yet.
        return;
    }

    // If time goes backwards drop the frame.
    // Check if subsequent buffers also overlap.
    while ((buf = hb_list_item(stream->in_queue, 0)) != NULL)
    {
        overlap = stream->next_pts - buf->s.start;
        if (overlap > 90 * 20)
        {
            if (stream->drop == 0)
            {
                stream->drop_pts = buf->s.start;
            }
            // This is likely to generate a gap in audio timestamps
            // This will be subsequently handled by the call to
            // fix AudioGap in Synchronize(). Small gaps will be handled
            // by just shifting the timestamps and carrying the gap
            // along.
            hb_list_rem(stream->in_queue, buf);
            stream->drop_duration += buf->s.duration;
            stream->drop++;
            drop++;
            hb_buffer_close(&buf);
        }
        else
        {
            break;
        }
    }

    if (drop <= 0 && stream->drop > 0)
    {
        hb_log("sync: audio 0x%x time went backwards %d ms, dropped %d frames. "
               "PTS %"PRId64"",
               stream->audio.audio->id, (int)stream->drop_duration / 90,
               stream->drop, stream->drop_pts);
        stream->drop_duration = 0;
        stream->drop = 0;
    }
}

static void fixSubtitleOverlap( sync_stream_t * stream )
{