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videodecoder: Drain out keyframes in TRICK_MODE_KEY_UNITS

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When asked to just decode keyframe, if we got a keyframe drain out
the decoder straight away.
This avoids having to wait for the next frame and reduces delay even
more.

https://bugzilla.gnome.org/show_bug.cgi?id=767232
This commit is contained in:
Edward Hervey 2016-06-04 09:51:17 +02:00 committed by Edward Hervey
parent eb1ebf226f
commit 183e94b2d3
1 changed files with 7 additions and 0 deletions
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7
gst-libs/gst/video/gstvideodecoder.c
View file

@ -2191,7 +2191,9 @@ gst_video_decoder_chain_forward (GstVideoDecoder * decoder,
priv->input_offset += gst_buffer_get_size (buf);
if (priv->packetized) {
gboolean was_keyframe = FALSE;
if (!GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
was_keyframe = TRUE;
GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT (priv->current_frame);
}
@ -2204,6 +2206,11 @@ gst_video_decoder_chain_forward (GstVideoDecoder * decoder,
ret = gst_video_decoder_decode_frame (decoder, priv->current_frame);
}
priv->current_frame = NULL;
/* If in trick mode and it was a keyframe, drain decoder to avoid extra
* latency */
if (was_keyframe
&& (decoder->output_segment.flags & GST_SEEK_FLAG_TRICKMODE_KEY_UNITS))
gst_video_decoder_drain_out (decoder, FALSE);
} else {
gst_adapter_push (priv->input_adapter, buf);