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videodecoder: use new segment earlier for reverse playback

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For reverse playback, the segment event will only be pushed when
the first buffer is actually pushed. But for decoding frames and storing
those into the list to be pushed the output_segment.rate value is used
to determine if it is forward or reverse playback.

In case a previous segment event (or none) is in use it will mistakenly
think it is doing forward playback and push the buffers immediatelly and
try to clip buffers based on an old segment (or an uninitialized one, leading
to an assertion)

This patch fixes this by copying the segment earlier if on reverse playback

https://bugzilla.gnome.org/show_bug.cgi?id=721666
This commit is contained in:
Thiago Santos 2014-01-06 20:53:15 -03:00
parent 0d66d05c98
commit 5b8e1925b5
1 changed files with 33 additions and 0 deletions
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33
gst-libs/gst/video/gstvideodecoder.c
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@ -1938,6 +1938,39 @@ gst_video_decoder_flush_parse (GstVideoDecoder * dec, gboolean at_eos)
/* move it to the front of the decode queue */
priv->decode = g_list_concat (walk, priv->decode);
/* this is reverse playback, check if we need to apply some segment
* to the output before decoding, as during decoding the segment.rate
* must be used to determine if a buffer should be pushed or added to
* the output list for reverse pushing.
*
* The new segment is not immediately pushed here because we must
* wait for negotiation to happen before it can be pushed to avoid
* pushing a segment before caps event. Negotiation only happens
* when finish_frame is called.
*/
for (walk = frame->events; walk;) {
GList *cur = walk;
GstEvent *event = walk->data;
walk = g_list_next (walk);
if (GST_EVENT_TYPE (event) <= GST_EVENT_SEGMENT) {
if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
GstSegment segment;
GST_DEBUG_OBJECT (dec, "Segment at frame %p %" GST_TIME_FORMAT,
frame, GST_TIME_ARGS (GST_BUFFER_PTS (frame->input_buffer)));
gst_event_copy_segment (event, &segment);
if (segment.format == GST_FORMAT_TIME) {
dec->output_segment = segment;
}
}
dec->priv->pending_events =
g_list_append (dec->priv->pending_events, event);
frame->events = g_list_delete_link (frame->events, cur);
}
}
/* if we copied a keyframe, flush and decode the decode queue */
if (GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT (frame)) {
GST_DEBUG_OBJECT (dec, "found keyframe %p with PTS %" GST_TIME_FORMAT