diff --git a/demux/demux.c b/demux/demux.c index 0582ccc661..892af331fb 100644 --- a/demux/demux.c +++ b/demux/demux.c @@ -1484,38 +1484,6 @@ static void back_demux_see_packets(struct demux_stream *ds) find_backward_restart_pos(ds); } -// Resume demuxing from an earlier position for backward playback. May trigger -// a seek. -static void step_backwards(struct demux_stream *ds) -{ - struct demux_internal *in = ds->in; - - assert(in->back_demuxing); - - assert(!ds->back_restarting); - ds->back_restarting = true; - ds->back_restart_eof = false; - ds->back_restart_next = false; - - // Move to start of queue. This is inefficient, because we need to iterate - // the entire fucking packet queue just to update the fw_* stats. But as - // long as we don't have demux_packet.prev links or a complete index, it's - // the thing to do. - // Note: if the buffer forward is much larger than the one backward, it - // would be worth looping until the previous reader_head and decrementing - // fw_packs/fw_bytes - you could skip the full recompute_buffers(). - ds->reader_head = ds->queue->head; - in->fw_bytes -= ds->fw_bytes; - recompute_buffers(ds); - in->fw_bytes += ds->fw_bytes; - - // Exclude weird special-cases (incomplete pruning? broken seeks?) - while (ds->reader_head && !ds->reader_head->keyframe) - advance_reader_head(ds); - - find_backward_restart_pos(ds); -} - // Add the keyframe to the end of the index. Not all packets are actually added. static void add_index_entry(struct demux_queue *queue, struct demux_packet *dp) { @@ -2285,7 +2253,12 @@ static int dequeue_packet(struct demux_stream *ds, struct demux_packet **res) if (ds->back_range_started && !ds->back_range_min && ((ds->reader_head && ds->reader_head->keyframe) || eof)) { - step_backwards(ds); + ds->back_restarting = true; + ds->back_restart_eof = false; + ds->back_restart_next = false; + + find_backward_restart_pos(ds); + if (ds->back_restarting) return 0; }