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matroskademux: Store alpha stream in VideoCodecAlphaMeta

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This generalize the feature over using mini object quark data. If
that feature was Matroska specifc, using the new CustomMeta would have
been enough and arguably cleaner then QData, though it seems that
similar technique is use with AV1 Image Format (AVIF).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/968>
This commit is contained in:
Nicolas Dufresne 2021-03-22 16:58:26 -04:00
parent b84bad6ac3
commit b2e857efc6
1 changed files with 14 additions and 7 deletions
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21
gst/matroska/matroska-demux.c
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@ -64,6 +64,7 @@
#include <gst/audio/audio.h>
#include <gst/tag/tag.h>
#include <gst/pbutils/pbutils.h>
#include <gst/video/gstvideocodecalphameta.h>
#include <gst/video/video.h>
#include "gstmatroskaelements.h"
@ -4982,14 +4983,20 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
while ((blockadd = g_queue_pop_head (&additions))) {
if (blockadd->id == 1
&& !strcmp (stream->codec_id, GST_MATROSKA_CODEC_ID_VIDEO_VP8)) {
GST_TRACE_OBJECT (demux, "adding block addition %u as VP8 alpha "
"qdata to buffer %p, %u bytes", (guint) blockadd->id, buf,
&& (!strcmp (stream->codec_id, GST_MATROSKA_CODEC_ID_VIDEO_VP8)
|| !strcmp (stream->codec_id,
GST_MATROSKA_CODEC_ID_VIDEO_VP9))) {
GstBuffer *alpha_buffer;
GST_TRACE_OBJECT (demux, "adding block addition %u as VP8/VP9 "
"alpha meta to buffer %p, %u bytes", (guint) blockadd->id, buf,
(guint) blockadd->size);
gst_mini_object_set_qdata (GST_MINI_OBJECT (sub),
matroska_block_additional_quark,
g_bytes_new_take (blockadd->data, blockadd->size),
(GDestroyNotify) g_bytes_unref);
alpha_buffer = gst_buffer_new_wrapped (blockadd->data,
blockadd->size);
gst_buffer_copy_into (alpha_buffer, sub,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
gst_buffer_add_video_codec_alpha_meta (sub, alpha_buffer);
} else {
g_free (blockadd->data);
}