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ext/mpeg2dec/gstmpeg2dec.*: Add buffer clipping.
Original commit message from CVS: * ext/mpeg2dec/gstmpeg2dec.c: (clear_queued), (flush_queued), (handle_picture), (clip_buffer), (handle_slice), (gst_mpeg2dec_chain), (gst_mpeg2dec_sink_event), (gst_mpeg2dec_change_state): * ext/mpeg2dec/gstmpeg2dec.h: Add buffer clipping. Add basic reverse playback support. Not complete yet when dealing with non-closed GOPs.
This commit is contained in:
Wim Taymans
parent
0d018f956a
commit
30d994fafa
3 changed files with 136 additions and 17 deletions
11
ChangeLog
11
ChangeLog
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@ -1,3 +1,14 @@
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2008-01-10 Wim Taymans <wim.taymans@collabora.co.uk>
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* ext/mpeg2dec/gstmpeg2dec.c: (clear_queued), (flush_queued),
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(handle_picture), (clip_buffer), (handle_slice),
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(gst_mpeg2dec_chain), (gst_mpeg2dec_sink_event),
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(gst_mpeg2dec_change_state):
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* ext/mpeg2dec/gstmpeg2dec.h:
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Add buffer clipping.
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Add basic reverse playback support. Not complete yet when dealing with
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non-closed GOPs.
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2008-01-10 Sebastian Dröge <slomo@circular-chaos.org>
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* autogen.sh:
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@ -680,6 +680,35 @@ clear_buffers (GstMpeg2dec * mpeg2dec)
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*bufpen = NULL;
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}
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static void
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clear_queued (GstMpeg2dec * mpeg2dec)
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{
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g_list_foreach (mpeg2dec->queued, (GFunc) gst_mini_object_unref, NULL);
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g_list_free (mpeg2dec->queued);
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mpeg2dec->queued = NULL;
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}
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static GstFlowReturn
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flush_queued (GstMpeg2dec * mpeg2dec)
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{
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GstFlowReturn res;
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while (mpeg2dec->queued) {
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GstBuffer *buf = GST_BUFFER_CAST (mpeg2dec->queued->data);
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GST_LOG_OBJECT (mpeg2dec, "pushing buffer %p, timestamp %"
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GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT, buf,
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
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GST_TIME_ARGS (GST_BUFFER_DURATION (buf)));
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/* iterate ouput queue an push downstream */
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res = gst_pad_push (mpeg2dec->srcpad, buf);
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mpeg2dec->queued = g_list_delete_link (mpeg2dec->queued, mpeg2dec->queued);
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}
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return res;
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}
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static GstFlowReturn
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handle_picture (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
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{
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@ -705,6 +734,11 @@ handle_picture (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
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switch (type) {
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case PIC_FLAG_CODING_TYPE_I:
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mpeg2_skip (mpeg2dec->decoder, 0);
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if (mpeg2dec->segment.rate < 0.0) {
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/* negative rate, flush the queued pictures in reverse */
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GST_DEBUG_OBJECT (mpeg2dec, "flushing queued buffers");
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flush_queued (mpeg2dec);
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}
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case PIC_FLAG_CODING_TYPE_P:
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bufpen = &mpeg2dec->ip_buffers[mpeg2dec->ip_bufpos];
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GST_DEBUG_OBJECT (mpeg2dec, "I/P unref %p, ref %p", *bufpen, outbuf);
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@ -741,6 +775,49 @@ no_buffer:
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}
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}
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/* try to clip the buffer to the segment boundaries */
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static gboolean
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clip_buffer (GstMpeg2dec * dec, GstBuffer * buf)
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{
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gboolean res = TRUE;
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GstClockTime in_ts, in_dur, stop;
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gint64 cstart, cstop;
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in_ts = GST_BUFFER_TIMESTAMP (buf);
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in_dur = GST_BUFFER_DURATION (buf);
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GST_LOG_OBJECT (dec,
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"timestamp:%" GST_TIME_FORMAT " , duration:%" GST_TIME_FORMAT,
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GST_TIME_ARGS (in_ts), GST_TIME_ARGS (in_dur));
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/* can't clip without TIME segment */
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if (dec->segment.format != GST_FORMAT_TIME)
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goto beach;
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/* we need a start time */
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if (!GST_CLOCK_TIME_IS_VALID (in_ts))
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goto beach;
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/* generate valid stop, if duration unknown, we have unknown stop */
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stop =
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GST_CLOCK_TIME_IS_VALID (in_dur) ? (in_ts + in_dur) : GST_CLOCK_TIME_NONE;
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/* now clip */
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if (!(res = gst_segment_clip (&dec->segment, GST_FORMAT_TIME,
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in_ts, stop, &cstart, &cstop)))
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goto beach;
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/* update timestamp and possibly duration if the clipped stop time is
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* valid */
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GST_BUFFER_TIMESTAMP (buf) = cstart;
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if (GST_CLOCK_TIME_IS_VALID (cstop))
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GST_BUFFER_DURATION (buf) = cstop - cstart;
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beach:
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GST_LOG_OBJECT (dec, "%sdropping", (res ? "not " : ""));
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return res;
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}
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static GstFlowReturn
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handle_slice (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
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{
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@ -838,6 +915,10 @@ handle_slice (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
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if (mpeg2dec->discont_state != MPEG2DEC_DISC_NONE)
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goto drop;
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/* check for clipping */
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if (!clip_buffer (mpeg2dec, outbuf))
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goto clipped;
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if (GST_CLOCK_TIME_IS_VALID (time)) {
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gboolean need_skip;
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GstClockTime qostime;
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@ -859,12 +940,6 @@ handle_slice (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
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goto dropping_qos;
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}
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GST_LOG_OBJECT (mpeg2dec, "pushing buffer %p, timestamp %"
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GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
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outbuf,
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
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GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)));
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/* ref before pushing it out, so we still have the ref in our
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* array of buffers */
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gst_buffer_ref (outbuf);
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@ -872,8 +947,24 @@ handle_slice (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
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/* do cropping if needed */
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crop_buffer (mpeg2dec, &outbuf);
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ret = gst_pad_push (mpeg2dec->srcpad, outbuf);
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GST_DEBUG_OBJECT (mpeg2dec, "pushed with result %s", gst_flow_get_name (ret));
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if (mpeg2dec->segment.rate >= 0.0) {
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/* forward: push right away */
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GST_LOG_OBJECT (mpeg2dec, "pushing buffer %p, timestamp %"
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GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
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outbuf,
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
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GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)));
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ret = gst_pad_push (mpeg2dec->srcpad, outbuf);
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GST_DEBUG_OBJECT (mpeg2dec, "pushed with result %s",
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gst_flow_get_name (ret));
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} else {
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/* reverse: queue, we'll push in reverse when we receive the next (previous)
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* keyframe. */
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GST_DEBUG_OBJECT (mpeg2dec, "queued frame");
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mpeg2dec->queued = g_list_prepend (mpeg2dec->queued, outbuf);
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ret = GST_FLOW_OK;
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}
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return ret;
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@ -894,6 +985,11 @@ drop:
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mpeg2dec->discont_state);
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return GST_FLOW_OK;
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}
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clipped:
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{
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GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer, clipped");
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return GST_FLOW_OK;
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}
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dropping_qos:
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{
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GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer because of QoS");
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@ -949,6 +1045,15 @@ gst_mpeg2dec_chain (GstPad * pad, GstBuffer * buf)
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data = GST_BUFFER_DATA (buf);
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pts = GST_BUFFER_TIMESTAMP (buf);
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if (GST_BUFFER_IS_DISCONT (buf)) {
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GST_LOG_OBJECT (mpeg2dec, "DISCONT, reset decoder");
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/* when we receive a discont, reset our state as to not create too much
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* distortion in the picture due to missing packets */
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mpeg2_reset (mpeg2dec->decoder, 0);
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mpeg2_skip (mpeg2dec->decoder, 1);
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mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
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}
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GST_LOG_OBJECT (mpeg2dec, "received buffer, timestamp %"
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GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
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@ -1095,13 +1200,15 @@ gst_mpeg2dec_sink_event (GstPad * pad, GstEvent * event)
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if (format != GST_FORMAT_TIME)
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goto newseg_wrong_format;
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if (rate <= 0.0)
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goto newseg_wrong_rate;
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/* now configure the values */
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gst_segment_set_newsegment_full (&mpeg2dec->segment, update,
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rate, arate, format, start, stop, time);
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GST_DEBUG_OBJECT (mpeg2dec,
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"Pushing newseg rate %g, applied rate %g, format %d, start %"
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G_GINT64_FORMAT ", stop %" G_GINT64_FORMAT ", pos %" G_GINT64_FORMAT,
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rate, arate, format, start, stop, time);
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ret = gst_pad_push_event (mpeg2dec->srcpad, event);
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break;
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}
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@ -1115,6 +1222,7 @@ gst_mpeg2dec_sink_event (GstPad * pad, GstEvent * event)
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gst_mpeg2dec_qos_reset (mpeg2dec);
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mpeg2_reset (mpeg2dec->decoder, 0);
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mpeg2_skip (mpeg2dec->decoder, 1);
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clear_queued (mpeg2dec);
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ret = gst_pad_push_event (mpeg2dec->srcpad, event);
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break;
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}
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@ -1141,12 +1249,6 @@ newseg_wrong_format:
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gst_event_unref (event);
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goto done;
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}
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newseg_wrong_rate:
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{
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GST_DEBUG_OBJECT (mpeg2dec, "negative rates not supported yet");
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gst_event_unref (event);
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goto done;
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}
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}
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static gboolean
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@ -1615,6 +1717,7 @@ gst_mpeg2dec_change_state (GstElement * element, GstStateChange transition)
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break;
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_mpeg2dec_qos_reset (mpeg2dec);
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clear_queued (mpeg2dec);
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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if (mpeg2dec->decoder) {
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@ -116,6 +116,11 @@ struct _GstMpeg2dec {
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/* QoS stuff */ /* with LOCK*/
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gdouble proportion;
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GstClockTime earliest_time;
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/* gather/decode queues for reverse playback */
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GList *gather;
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GList *decode;
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GList *queued;
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};
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struct _GstMpeg2decClass {
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