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videodecoder: Only drain in KEY_UNITS trick mode after a keyframe in forwards playback mode

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For reverse playback the same behaviour was already implemented in
flush_parse().

For reverse playback, chain_forward() is only used to gather frames and not
for decoding, and it is actually called by the draining logic, causing an
infinite recursion.
This commit is contained in:
Sebastian Dröge 2016-06-09 18:53:54 +03:00
parent 8bee96c4a2
commit 0c7022d681
1 changed files with 10 additions and 2 deletions
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12
gst-libs/gst/video/gstvideodecoder.c
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@ -2179,6 +2179,9 @@ gst_video_decoder_chain_forward (GstVideoDecoder * decoder,
g_return_val_if_fail (priv->packetized || klass->parse, GST_FLOW_ERROR);
/* Draining on DISCONT is handled in chain_reverse() for reverse playback,
* and this function would only be called to get everything collected GOP
* by GOP in the parse_gather list */
if (decoder->input_segment.rate > 0.0 && GST_BUFFER_IS_DISCONT (buf))
ret = gst_video_decoder_drain_out (decoder, FALSE);
@ -2207,8 +2210,13 @@ gst_video_decoder_chain_forward (GstVideoDecoder * decoder,
}
priv->current_frame = NULL;
/* If in trick mode and it was a keyframe, drain decoder to avoid extra
* latency */
if (was_keyframe
* latency. Only do this for forwards playback as reverse playback handles
* draining on keyframes in flush_parse(), and would otherwise call back
* from drain_out() to here causing an infinite loop.
* Also this function is only called for reverse playback to gather frames
* GOP by GOP, and does not do any actual decoding. That would be done by
* flush_decode() */
if (was_keyframe && decoder->output_segment.rate > 0.0
&& (decoder->output_segment.flags & GST_SEEK_FLAG_TRICKMODE_KEY_UNITS))
gst_video_decoder_drain_out (decoder, FALSE);
} else {