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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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alphacodecdemux: Implement meta demuxing
Produce two streams from a buffer that has GstVideoCodecAlphaMeta attached. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2199>
This commit is contained in:
Nicolas Dufresne
parent
f3114d4d7e
commit
4dbf61d1ef
1 changed files with 217 additions and 6 deletions
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@ -22,9 +22,9 @@
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* SECTION:element-codecalphademux
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* @title: CODEC Alpha Demuxer
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*
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* Extract the CODEC (typically VP8/VP9) alpha stream stored at meta and
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* expose it as a stream. This element allow using single stream VP9 decoders
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* in order to decode both streams.
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* Extracts the CODEC (typically VP8/VP9) alpha stream stored as meta and
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* exposes it as a stream. This element allow using single stream VP8/9
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* decoders in order to decode both streams.
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*
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* ## Example launch line
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* |[
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@ -33,8 +33,9 @@
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* d.video ! queue ! vp9dec ! autovideosink
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* d.alpha ! queue ! vp9dec ! autovideosink
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* ]| This pipeline splits and decode the video and the alpha stream, showing
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* the result on seperate window.
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* the result on seperate windows.
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*
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* Since: 1.20
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*/
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#ifdef HAVE_CONFIG_H
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@ -42,6 +43,8 @@
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#endif
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#include <gst/video/video.h>
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#include <gst/base/gstflowcombiner.h>
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#include "gstcodecalphademux.h"
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GST_DEBUG_CATEGORY_STATIC (codecalphademux_debug);
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@ -50,10 +53,16 @@ GST_DEBUG_CATEGORY_STATIC (codecalphademux_debug);
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struct _GstCodecAlphaDemux
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{
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GstElement parent;
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GstPad *sink_pad;
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GstPad *src_pad;
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GstPad *alpha_pad;
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GstFlowCombiner *flow_combiner;
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};
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#define gst_codec_alpha_demux_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstCodecAlphaDemux, gst_codec_alpha_demux,
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G_DEFINE_TYPE_WITH_CODE (GstCodecAlphaDemux, gst_codec_alpha_demux,
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GST_TYPE_ELEMENT,
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GST_DEBUG_CATEGORY_INIT (codecalphademux_debug, "codecalphademux", 0,
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"codecalphademux"));
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@ -82,10 +91,187 @@ GST_STATIC_PAD_TEMPLATE ("alpha",
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GST_STATIC_CAPS ("ANY")
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);
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static GstFlowReturn
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gst_codec_alpha_demux_chain (GstPad * pad, GstObject * object,
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GstBuffer * buffer)
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{
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GstCodecAlphaDemux *self = GST_CODEC_ALPHA_DEMUX (object);
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GstVideoCodecAlphaMeta *alpha_meta =
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gst_buffer_get_video_codec_alpha_meta (buffer);
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GstBuffer *alpha_buffer = NULL;
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GstClockTime pts = GST_BUFFER_PTS (buffer);
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GstClockTime duration = GST_BUFFER_DURATION (buffer);
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GstFlowReturn ret;
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if (alpha_meta)
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alpha_buffer = gst_buffer_ref (alpha_meta->buffer);
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ret = gst_flow_combiner_update_pad_flow (self->flow_combiner,
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self->src_pad, gst_pad_push (self->src_pad, buffer));
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/* we lost ownership here */
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buffer = NULL;
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alpha_meta = NULL;
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if (alpha_buffer)
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ret = gst_flow_combiner_update_pad_flow (self->flow_combiner,
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self->alpha_pad, gst_pad_push (self->alpha_pad, alpha_buffer));
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else
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ret = gst_flow_combiner_update_pad_flow (self->flow_combiner,
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self->alpha_pad, gst_pad_push_event (self->alpha_pad,
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gst_event_new_gap (pts, duration)));
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return ret;
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}
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static GstCaps *
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gst_codec_alpha_demux_transform_caps (GstCaps * caps, gboolean codec_alpha)
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{
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if (!caps)
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return NULL;
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caps = gst_caps_copy (caps);
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gst_caps_set_simple (caps, "codec-alpha", G_TYPE_BOOLEAN, codec_alpha, NULL);
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return caps;
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}
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static GstEvent *
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gst_codec_alpha_demux_transform_caps_event (GstEvent * src_event)
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{
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GstEvent *dst_event;
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GstCaps *caps;
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gst_event_parse_caps (src_event, &caps);
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caps = gst_codec_alpha_demux_transform_caps (caps, FALSE);
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dst_event = gst_event_new_caps (caps);
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gst_event_set_seqnum (dst_event, gst_event_get_seqnum (src_event));
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gst_caps_unref (caps);
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gst_event_unref (src_event);
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return dst_event;
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}
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static gboolean
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gst_codec_alpha_demux_sink_event (GstPad * sink_pad, GstObject * parent,
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GstEvent * event)
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{
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GstCodecAlphaDemux *self = GST_CODEC_ALPHA_DEMUX (parent);
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switch (event->type) {
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case GST_EVENT_FLUSH_STOP:
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gst_flow_combiner_reset (self->flow_combiner);
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break;
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case GST_EVENT_CAPS:
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event = gst_codec_alpha_demux_transform_caps_event (event);
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break;
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default:
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break;
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}
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return gst_pad_event_default (sink_pad, parent, event);
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}
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static gboolean
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gst_codec_alpha_demux_sink_query (GstPad * sink_pad, GstObject * parent,
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GstQuery * query)
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{
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GstQuery *peer_query;
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GstCaps *caps;
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gboolean ret;
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switch (query->type) {
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case GST_QUERY_CAPS:
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gst_query_parse_caps (query, &caps);
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caps = gst_codec_alpha_demux_transform_caps (caps, FALSE);
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peer_query = gst_query_new_caps (caps);
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gst_clear_caps (&caps);
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break;
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case GST_QUERY_ACCEPT_CAPS:
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gst_query_parse_accept_caps (query, &caps);
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caps = gst_codec_alpha_demux_transform_caps (caps, FALSE);
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peer_query = gst_query_new_accept_caps (caps);
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gst_clear_caps (&caps);
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break;
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default:
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peer_query = query;
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break;
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}
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ret = gst_pad_query_default (sink_pad, parent, peer_query);
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if (!ret) {
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if (peer_query != query)
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gst_query_unref (peer_query);
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return FALSE;
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}
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switch (query->type) {
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case GST_QUERY_CAPS:
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gst_query_parse_caps_result (peer_query, &caps);
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caps = gst_caps_copy (caps);
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caps = gst_codec_alpha_demux_transform_caps (caps, TRUE);
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gst_query_set_caps_result (query, caps);
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gst_caps_unref (caps);
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gst_query_unref (peer_query);
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break;
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case GST_QUERY_ACCEPT_CAPS:
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{
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gboolean result;
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gst_query_parse_accept_caps_result (peer_query, &result);
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gst_query_set_accept_caps_result (query, result);
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gst_query_unref (peer_query);
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break;
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}
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default:
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break;
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}
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return ret;
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}
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static void
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gst_codec_alpha_demux_start (GstCodecAlphaDemux * self)
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{
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gst_flow_combiner_reset (self->flow_combiner);
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}
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static GstStateChangeReturn
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gst_codec_alpha_demux_change_state (GstElement * element,
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GstStateChange transition)
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{
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GstCodecAlphaDemux *self = GST_CODEC_ALPHA_DEMUX (element);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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gst_codec_alpha_demux_start (self);
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default:
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break;
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}
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return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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}
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static void
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gst_codec_alpha_demux_dispose (GObject * object)
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{
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GstCodecAlphaDemux *self = GST_CODEC_ALPHA_DEMUX (object);
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g_clear_object (&self->sink_pad);
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g_clear_object (&self->src_pad);
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g_clear_object (&self->alpha_pad);
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g_clear_pointer (&self->flow_combiner, gst_flow_combiner_unref);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_codec_alpha_demux_class_init (GstCodecAlphaDemuxClass * klass)
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{
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GstElementClass *element_class = (GstElementClass *) klass;
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GObjectClass *object_class = (GObjectClass *) klass;
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gst_element_class_set_static_metadata (element_class,
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"CODEC Alpha Demuxer", "Codec/Demuxer",
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@ -98,9 +284,34 @@ gst_codec_alpha_demux_class_init (GstCodecAlphaDemuxClass * klass)
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&gst_codec_alpha_demux_src_template);
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gst_element_class_add_static_pad_template (element_class,
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&gst_codec_alpha_demux_alpha_template);
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element_class->change_state =
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GST_DEBUG_FUNCPTR (gst_codec_alpha_demux_change_state);
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object_class->dispose = GST_DEBUG_FUNCPTR (gst_codec_alpha_demux_dispose);
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}
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static void
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gst_codec_alpha_demux_init (GstCodecAlphaDemux * demux)
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gst_codec_alpha_demux_init (GstCodecAlphaDemux * self)
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{
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gst_element_create_all_pads (GST_ELEMENT (self));
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self->sink_pad = gst_element_get_static_pad (GST_ELEMENT (self), "sink");
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self->src_pad = gst_element_get_static_pad (GST_ELEMENT (self), "src");
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self->alpha_pad = gst_element_get_static_pad (GST_ELEMENT (self), "alpha");
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self->flow_combiner = gst_flow_combiner_new ();
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gst_flow_combiner_add_pad (self->flow_combiner, self->src_pad);
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gst_flow_combiner_add_pad (self->flow_combiner, self->alpha_pad);
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GST_PAD_SET_PROXY_CAPS (self->sink_pad);
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GST_PAD_SET_PROXY_CAPS (self->src_pad);
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GST_PAD_SET_PROXY_CAPS (self->alpha_pad);
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GST_PAD_SET_PROXY_SCHEDULING (self->sink_pad);
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GST_PAD_SET_PROXY_SCHEDULING (self->src_pad);
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GST_PAD_SET_PROXY_SCHEDULING (self->alpha_pad);
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gst_pad_set_chain_function (self->sink_pad, gst_codec_alpha_demux_chain);
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gst_pad_set_event_function (self->sink_pad, gst_codec_alpha_demux_sink_event);
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gst_pad_set_query_function (self->sink_pad, gst_codec_alpha_demux_sink_query);
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}
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