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ext/ogg/gstoggdemux.c: Implement first stab at reverse playback.
Original commit message from CVS: * ext/ogg/gstoggdemux.c: (gst_ogg_pad_submit_page), (gst_ogg_demux_get_prev_page), (gst_ogg_demux_perform_seek), (gst_ogg_demux_handle_page), (gst_ogg_demux_chain), (gst_ogg_demux_loop_forward), (gst_ogg_demux_loop_reverse), (gst_ogg_demux_loop): Implement first stab at reverse playback.
This commit is contained in:
Christian Schaller
parent
86de56e49d
commit
099f2f0ef7
2 changed files with 214 additions and 136 deletions
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@ -1,3 +1,12 @@
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2006-11-09 Christian F.K. Schaller <set EMAIL_ADDRESS environment variable>
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* ext/ogg/gstoggdemux.c: (gst_ogg_pad_submit_page),
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(gst_ogg_demux_get_prev_page), (gst_ogg_demux_perform_seek),
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(gst_ogg_demux_handle_page), (gst_ogg_demux_chain),
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(gst_ogg_demux_loop_forward), (gst_ogg_demux_loop_reverse),
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(gst_ogg_demux_loop):
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Implement first stab at reverse playback.
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2006-11-07 Stefan Kost <ensonic@users.sf.net>
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* gst-libs/gst/riff/riff-media.c: (gst_riff_create_video_caps),
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@ -209,6 +209,7 @@ static gboolean gst_ogg_demux_collect_chain_info (GstOggDemux * ogg,
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GstOggChain * chain);
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static gboolean gst_ogg_demux_activate_chain (GstOggDemux * ogg,
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GstOggChain * chain, GstEvent * event);
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static void gst_ogg_chain_mark_discont (GstOggChain * chain);
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static gboolean gst_ogg_demux_perform_seek (GstOggDemux * ogg,
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GstEvent * event);
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@ -1200,8 +1201,7 @@ gst_ogg_pad_submit_page (GstOggPad * pad, ogg_page * page)
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done = TRUE;
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break;
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case -1:
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/* out of sync, could call gst_ogg_pad_reset() here but ogg can decode
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* the packet just fine. We should probably send a DISCONT though. */
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gst_ogg_chain_mark_discont (pad->chain);
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break;
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case 1:
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result = gst_ogg_pad_submit_packet (pad, &packet);
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@ -1636,7 +1636,7 @@ gst_ogg_demux_get_next_page (GstOggDemux * ogg, ogg_page * og, gint64 boundary)
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/* from the current offset, find the previous page, seeking backwards
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* until we find the page. */
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static gint
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static gint64
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gst_ogg_demux_get_prev_page (GstOggDemux * ogg, ogg_page * og)
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{
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gint64 begin = ogg->offset;
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@ -1668,7 +1668,7 @@ gst_ogg_demux_get_prev_page (GstOggDemux * ogg, ogg_page * og)
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/* we have the offset. Actually snork and hold the page now */
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gst_ogg_demux_seek (ogg, offset);
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ret = gst_ogg_demux_get_next_page (ogg, og, CHUNKSIZE);
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ret = gst_ogg_demux_get_next_page (ogg, og, -1);
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if (ret < 0)
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/* this shouldn't be possible */
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return OV_EFAULT;
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@ -1989,11 +1989,6 @@ gst_ogg_demux_perform_seek (GstOggDemux * ogg, GstEvent * event)
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GST_DEBUG_OBJECT (ogg, "can only seek on TIME");
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goto error;
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}
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/* cannot yet do backwards playback */
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if (rate <= 0.0) {
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GST_DEBUG_OBJECT (ogg, "can only seek with positive rate, not %lf", rate);
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goto error;
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}
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} else {
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GST_DEBUG_OBJECT (ogg, "seek without event");
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@ -2092,6 +2087,7 @@ gst_ogg_demux_perform_seek (GstOggDemux * ogg, GstEvent * event)
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GstEvent *event;
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gint64 stop;
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gint64 start;
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gint64 last_stop;
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/* we have to send the flush to the old chain, not the new one */
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if (flush)
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@ -2099,17 +2095,24 @@ gst_ogg_demux_perform_seek (GstOggDemux * ogg, GstEvent * event)
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if ((stop = ogg->segment.stop) == -1)
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stop = ogg->segment.duration;
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if (stop != -1)
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stop += chain->segment_start;
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start = ogg->segment.last_stop;
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start = ogg->segment.start;
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if (chain->segment_start != GST_CLOCK_TIME_NONE)
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start += chain->segment_start;
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last_stop = ogg->segment.last_stop;
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if (chain->segment_start != GST_CLOCK_TIME_NONE)
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last_stop += chain->segment_start;
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/* create the segment event we are going to send out */
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if (ogg->segment.rate >= 0.0)
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event = gst_event_new_new_segment (FALSE, ogg->segment.rate,
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ogg->segment.format, start, stop, ogg->segment.time);
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ogg->segment.format, last_stop, stop, ogg->segment.time);
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else
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event = gst_event_new_new_segment (FALSE, ogg->segment.rate,
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ogg->segment.format, start, last_stop, ogg->segment.time);
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if (chain != ogg->current_chain) {
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/* switch to different chain, send segment on new chain */
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@ -2602,44 +2605,23 @@ no_first_chain:
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}
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}
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/* streaming mode, receive a buffer, parse it, create pads for
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* the serialno, submit pages and packets to the oggpads
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*/
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static GstFlowReturn
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gst_ogg_demux_chain (GstPad * pad, GstBuffer * buffer)
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gst_ogg_demux_handle_page (GstOggDemux * ogg, ogg_page * page)
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{
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GstOggDemux *ogg;
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gint ret = -1;
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GstFlowReturn result = GST_FLOW_OK;
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guint serialno;
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ogg = GST_OGG_DEMUX (GST_OBJECT_PARENT (pad));
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GST_DEBUG_OBJECT (ogg, "chain");
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gst_ogg_demux_submit_buffer (ogg, buffer);
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while (ret != 0 && result == GST_FLOW_OK) {
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ogg_page page;
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ret = ogg_sync_pageout (&ogg->sync, &page);
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if (ret == 0)
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/* need more data */
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break;
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if (ret == -1) {
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/* discontinuity in the pages */
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} else {
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GstOggPad *pad;
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gint64 granule;
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guint serialno;
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GstFlowReturn result = GST_FLOW_OK;
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serialno = ogg_page_serialno (&page);
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granule = ogg_page_granulepos (&page);
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serialno = ogg_page_serialno (page);
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granule = ogg_page_granulepos (page);
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GST_LOG_OBJECT (ogg,
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"processing ogg page (serial %08x, pageno %ld, granulepos %"
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G_GINT64_FORMAT ", bos %d)",
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serialno, ogg_page_pageno (&page), granule, ogg_page_bos (&page));
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serialno, ogg_page_pageno (page), granule, ogg_page_bos (page));
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if (ogg_page_bos (&page)) {
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if (ogg_page_bos (page)) {
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GstOggChain *chain;
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/* first page */
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@ -2694,17 +2676,15 @@ gst_ogg_demux_chain (GstPad * pad, GstBuffer * buffer)
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pad = gst_ogg_demux_find_pad (ogg, serialno);
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}
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if (pad) {
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result = gst_ogg_pad_submit_page (pad, &page);
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result = gst_ogg_pad_submit_page (pad, page);
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} else {
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/* no pad, this is pretty fatal. This means an ogg page without bos
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* has been seen for this serialno. could just ignore it too... */
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goto unknown_pad;
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}
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}
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}
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return result;
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/* ERRORS */
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unknown_chain:
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{
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GST_ELEMENT_ERROR (ogg, STREAM, DECODE,
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@ -2721,6 +2701,37 @@ unknown_pad:
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}
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}
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/* streaming mode, receive a buffer, parse it, create pads for
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* the serialno, submit pages and packets to the oggpads
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*/
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static GstFlowReturn
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gst_ogg_demux_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstOggDemux *ogg;
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gint ret = -1;
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GstFlowReturn result = GST_FLOW_OK;
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ogg = GST_OGG_DEMUX (GST_OBJECT_PARENT (pad));
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GST_DEBUG_OBJECT (ogg, "chain");
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gst_ogg_demux_submit_buffer (ogg, buffer);
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while (ret != 0 && result == GST_FLOW_OK) {
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ogg_page page;
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ret = ogg_sync_pageout (&ogg->sync, &page);
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if (ret == 0)
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/* need more data */
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break;
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if (ret == -1) {
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/* discontinuity in the pages */
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} else {
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gst_ogg_demux_handle_page (ogg, &page);
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}
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}
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return result;
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}
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static void
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gst_ogg_demux_send_event (GstOggDemux * ogg, GstEvent * event)
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{
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@ -2778,6 +2789,93 @@ done:
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return ret;
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}
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static GstFlowReturn
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gst_ogg_demux_loop_forward (GstOggDemux * ogg)
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{
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GstFlowReturn ret;
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GstBuffer *buffer;
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if (ogg->offset == ogg->length) {
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GST_LOG_OBJECT (ogg, "no more data to pull %" G_GINT64_FORMAT
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" == %" G_GINT64_FORMAT, ogg->offset, ogg->length);
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ret = GST_FLOW_UNEXPECTED;
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goto done;
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}
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GST_LOG_OBJECT (ogg, "pull data %" G_GINT64_FORMAT, ogg->offset);
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ret = gst_pad_pull_range (ogg->sinkpad, ogg->offset, CHUNKSIZE, &buffer);
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if (ret != GST_FLOW_OK) {
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GST_LOG_OBJECT (ogg, "Failed pull_range");
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goto done;
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}
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ogg->offset += GST_BUFFER_SIZE (buffer);
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if (G_UNLIKELY (ogg->newsegment)) {
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gst_ogg_demux_send_event (ogg, ogg->newsegment);
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ogg->newsegment = NULL;
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}
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ret = gst_ogg_demux_chain (ogg->sinkpad, buffer);
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if (ret != GST_FLOW_OK) {
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GST_LOG_OBJECT (ogg, "Failed demux_chain");
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goto done;
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}
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/* check for the end of the segment */
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if (ogg->segment.stop != -1 && ogg->segment.last_stop != -1) {
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if (ogg->segment.last_stop > ogg->segment.stop) {
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ret = GST_FLOW_UNEXPECTED;
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goto done;
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}
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}
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done:
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return ret;
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}
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static GstFlowReturn
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gst_ogg_demux_loop_reverse (GstOggDemux * ogg)
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{
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GstFlowReturn ret;
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ogg_page page;
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gint64 offset;
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if (ogg->offset == 0) {
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GST_LOG_OBJECT (ogg, "no more data to pull %" G_GINT64_FORMAT
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" == 0", ogg->offset);
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ret = GST_FLOW_UNEXPECTED;
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goto done;
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}
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GST_LOG_OBJECT (ogg, "read page from %" G_GINT64_FORMAT, ogg->offset);
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offset = gst_ogg_demux_get_prev_page (ogg, &page);
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if (offset < 0) {
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ret = GST_FLOW_ERROR;
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goto done;
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}
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ogg->offset = offset;
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if (G_UNLIKELY (ogg->newsegment)) {
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gst_ogg_demux_send_event (ogg, ogg->newsegment);
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ogg->newsegment = NULL;
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}
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ret = gst_ogg_demux_handle_page (ogg, &page);
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if (ret != GST_FLOW_OK)
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goto done;
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/* check for the end of the segment */
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if (ogg->segment.start != -1 && ogg->segment.last_stop != -1) {
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if (ogg->segment.last_stop <= ogg->segment.start) {
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ret = GST_FLOW_UNEXPECTED;
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goto done;
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}
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}
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done:
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return ret;
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}
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/* random access code
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*
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* - first find all the chains and streams by scanning the file.
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@ -2789,7 +2887,6 @@ gst_ogg_demux_loop (GstOggPad * pad)
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{
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GstOggDemux *ogg;
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GstFlowReturn ret;
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GstBuffer *buffer;
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GstEvent *event;
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ogg = GST_OGG_DEMUX (GST_OBJECT_PARENT (pad));
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@ -2823,36 +2920,13 @@ gst_ogg_demux_loop (GstOggPad * pad)
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goto seek_failed;
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}
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if (ogg->offset == ogg->length) {
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GST_LOG_OBJECT (ogg, "no more data to pull %" G_GINT64_FORMAT
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" == %" G_GINT64_FORMAT, ogg->offset, ogg->length);
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goto eos;
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}
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if (ogg->segment.rate >= 0.0)
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ret = gst_ogg_demux_loop_forward (ogg);
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else
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ret = gst_ogg_demux_loop_reverse (ogg);
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GST_LOG_OBJECT (ogg, "pull data %" G_GINT64_FORMAT, ogg->offset);
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ret = gst_pad_pull_range (ogg->sinkpad, ogg->offset, CHUNKSIZE, &buffer);
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if (ret != GST_FLOW_OK) {
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GST_LOG_OBJECT (ogg, "Failed pull_range");
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if (ret != GST_FLOW_OK)
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goto pause;
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}
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ogg->offset += GST_BUFFER_SIZE (buffer);
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if (G_UNLIKELY (ogg->newsegment)) {
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gst_ogg_demux_send_event (ogg, ogg->newsegment);
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ogg->newsegment = NULL;
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}
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ret = gst_ogg_demux_chain (ogg->sinkpad, buffer);
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if (ret != GST_FLOW_OK) {
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GST_LOG_OBJECT (ogg, "Failed demux_chain");
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goto pause;
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}
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/* check for the end of the segment */
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if (ogg->segment.stop != -1 && ogg->segment.last_stop != -1)
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if (ogg->segment.last_stop > ogg->segment.stop)
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goto eos;
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return;
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@ -2870,11 +2944,6 @@ seek_failed:
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ret = GST_FLOW_ERROR;
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goto pause;
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}
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eos:
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{
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ret = GST_FLOW_UNEXPECTED;
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goto pause;
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}
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pause:
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{
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const gchar *reason = gst_flow_get_name (ret);
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