Function fixAudioGap

libhb/sync.c:1049–1108

Fix audio gaps that could not be corrected with dejitter

// Fix audio gaps that could not be corrected with dejitter
static void fixAudioGap( sync_stream_t * stream )
{
    int64_t       gap;
    hb_buffer_t * buf;

    if (hb_list_count(stream->in_queue) < 1 || !stream->first_frame)
    {
        // Can't find gaps with < 1 buffers
        return;
    }

    buf  = hb_list_item(stream->in_queue, 0);
    gap = buf->s.start - stream->next_pts;

    // If there's a gap of more than a minute between the last
    // frame and this, assume we got a corrupted timestamp.
    if (gap > 90 * 20 && gap < 90000LL * 60)
    {
        if (stream->gap_duration <= 0)
        {
            stream->gap_pts = buf->s.start;
        }
        buf = CreateSilenceBuf(stream, gap, stream->next_pts);
        if (buf != NULL)
        {
            hb_buffer_t * next;
            int           pos;
            for (pos = 0; buf != NULL; buf = next, pos++)
            {
                next = buf->next;
                buf->next = NULL;
                hb_list_insert(stream->in_queue, pos, buf);
            }
        }
        else
        {
            addDelta(stream->common, stream->next_pts, gap);
            applyDeltas(stream->common);
        }
        stream->gap_duration += gap;
    }
    else
    {
        // If not fixing the gap, carry to the next frame
        // so they do not accumulate. Do not carry negative gaps.
        // Those are overlaps and are handled by fixAudioOverlap.
        if (gap >= 90000LL * 60)
        {
            // Fix "corrupted" timestamp
            buf->s.start = stream->next_pts;
        }
        if (stream->gap_duration > 0)
        {
            hb_deep_log(3, "sync: audio 0x%x time gap %d ms. PTS %"PRId64"",
                        stream->audio.audio->id, (int)stream->gap_duration / 90,
                        stream->gap_pts);
            stream->gap_duration = 0;
        }