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codecs: av1dec: Fix to output frame with highest spatial layer

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During the output process, if there are multiple frames in a TU (i.e. multi-spatial
layers case), only one frame with the highest spatial layer id should be selected
according to av1 spec. The highest spatial layer id is obtained from idc value of
the operating point.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2475>
This commit is contained in:
Mengkejiergeli Ba 2021-08-20 13:28:51 +08:00 committed by GStreamer Marge Bot
parent fd1e75900d
commit 702e69e841
1 changed files with 25 additions and 3 deletions
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28
gst-libs/gst/codecs/gstav1decoder.c
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@ -52,6 +52,18 @@ G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstAV1Decoder, gst_av1_decoder,
GST_DEBUG_CATEGORY_INIT (gst_av1_decoder_debug, "av1decoder", 0,
"AV1 Video Decoder"));
static gint
_floor_log2 (guint32 x)
{
gint s = 0;
while (x != 0) {
x = x >> 1;
s++;
}
return s - 1;
}
static gboolean gst_av1_decoder_start (GstVideoDecoder * decoder);
static gboolean gst_av1_decoder_stop (GstVideoDecoder * decoder);
static gboolean gst_av1_decoder_set_format (GstVideoDecoder * decoder,
@ -591,9 +603,19 @@ out:
if (ret == GST_FLOW_OK) {
if (priv->current_picture->frame_hdr.show_frame ||
priv->current_picture->frame_hdr.show_existing_frame) {
g_assert (klass->output_picture);
/* transfer ownership of frame and picture */
ret = klass->output_picture (self, frame, priv->current_picture);
/* Only output one frame with the highest spatial id from each TU
* when there are multiple spatial layers.
*/
if (priv->parser->state.operating_point_idc &&
obu.header.obu_spatial_id <
_floor_log2 (priv->parser->state.operating_point_idc >> 8)) {
gst_av1_picture_unref (priv->current_picture);
gst_video_decoder_release_frame (decoder, frame);
} else {
g_assert (klass->output_picture);
/* transfer ownership of frame and picture */
ret = klass->output_picture (self, frame, priv->current_picture);
}
} else {
GST_LOG_OBJECT (self, "Decode only picture %p", priv->current_picture);
GST_VIDEO_CODEC_FRAME_SET_DECODE_ONLY (frame);