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vtdec: minimize renegotiation to make hw decoding more reliable

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The hardware decoder can become (temporarily) unavailable across
VTDecompressionSessionCreate/Destroy calls. During negotiation if the currently
configured caps are still accepted by downstream we keep using them so we don't
have to destroy and recreate the decoding session.

This indirectly fixes https://bugzilla.gnome.org/show_bug.cgi?id=767429, by
making vtdec stick to GLMemory.
This commit is contained in:
Alessandro Decina 2016-06-16 14:18:18 +10:00
parent ba69afdc47
commit 9a026799f0
1 changed files with 23 additions and 11 deletions
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34
sys/applemedia/vtdec.c
View file

@ -232,12 +232,30 @@ gst_vtdec_negotiate (GstVideoDecoder * decoder)
vtdec = GST_VTDEC (decoder);
if (vtdec->session)
gst_vtdec_push_frames_if_needed (vtdec, TRUE, FALSE);
templcaps =
gst_pad_get_pad_template_caps (GST_VIDEO_DECODER_SRC_PAD (decoder));
output_state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (vtdec));
if (output_state) {
prevcaps = gst_caps_ref (output_state->caps);
gst_video_codec_state_unref (output_state);
}
peercaps = gst_pad_peer_query_caps (GST_VIDEO_DECODER_SRC_PAD (vtdec), NULL);
caps =
gst_caps_intersect_full (peercaps, templcaps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (templcaps);
if (prevcaps && gst_caps_can_intersect (prevcaps, peercaps)) {
/* The hardware decoder can become (temporarily) unavailable across
* VTDecompressionSessionCreate/Destroy calls. So if the currently configured
* caps are still accepted by downstream we keep them so we don't have to
* destroy and recreate the session.
*/
GST_INFO_OBJECT (vtdec,
"current and peer caps are compatible, keeping current caps");
caps = gst_caps_ref (prevcaps);
} else {
templcaps =
gst_pad_get_pad_template_caps (GST_VIDEO_DECODER_SRC_PAD (decoder));
caps =
gst_caps_intersect_full (peercaps, templcaps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (templcaps);
}
gst_caps_unref (peercaps);
caps = gst_caps_truncate (gst_caps_make_writable (caps));
@ -248,12 +266,6 @@ gst_vtdec_negotiate (GstVideoDecoder * decoder)
if (features)
features = gst_caps_features_copy (features);
output_state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (vtdec));
if (output_state) {
prevcaps = gst_caps_ref (output_state->caps);
gst_video_codec_state_unref (output_state);
}
output_state = gst_video_decoder_set_output_state (GST_VIDEO_DECODER (vtdec),
format, vtdec->video_info.width, vtdec->video_info.height,
vtdec->input_state);