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691 lines
20 KiB
C
691 lines
20 KiB
C
/* GStreamer
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* Copyright (C) <2021> Collabora Ltd.
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-alphacombine
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* @title: Alpha Combiner
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*
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* This element can combine a Luma plane from one stream as being the alpha
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* plane of another stream. This element can only work with planar formats
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* that have an equivalent format with an alpha plane. This is notably used to
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* combine VP8/VP9 alpha streams from WebM container.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v videotestsrc ! c. videotestsrc pattern=ball ! c.
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* alphacombine name=c ! compositor ! videoconvert ! autovideosink
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* ]| This pipeline uses luma of a ball test pattern as alpha, combined with
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* default test pattern and renders the resulting moving ball on a checker
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* board.
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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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#include "config.h"
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#endif
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#include <gst/video/video.h>
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#include "gstalphacombine.h"
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#define SUPPORTED_SINK_FORMATS "{ I420, I420_10LE, NV12 }"
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#define SUPPORTED_ALPHA_FORMATS "{ GRAY8, I420, I420_10LE, NV12 }"
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#define SUPPORTED_SRC_FORMATS "{ A420, A420_10LE, AV12 }"
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/* *INDENT-OFF* */
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struct {
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GstVideoFormat sink;
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GstVideoFormat alpha;
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GstVideoFormat src;
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} format_map[] = {
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{
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.sink = GST_VIDEO_FORMAT_I420,
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.alpha = GST_VIDEO_FORMAT_I420,
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.src = GST_VIDEO_FORMAT_A420
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},{
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.sink = GST_VIDEO_FORMAT_I420,
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.alpha = GST_VIDEO_FORMAT_GRAY8,
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.src = GST_VIDEO_FORMAT_A420
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},{
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.sink = GST_VIDEO_FORMAT_I420,
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.alpha = GST_VIDEO_FORMAT_NV12,
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.src = GST_VIDEO_FORMAT_A420
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}, {
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.sink = GST_VIDEO_FORMAT_NV12,
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.alpha = GST_VIDEO_FORMAT_NV12,
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.src = GST_VIDEO_FORMAT_AV12,
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}, {
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.sink = GST_VIDEO_FORMAT_NV12,
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.alpha = GST_VIDEO_FORMAT_GRAY8,
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.src = GST_VIDEO_FORMAT_AV12
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},{
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.sink = GST_VIDEO_FORMAT_NV12,
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.alpha = GST_VIDEO_FORMAT_I420,
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.src = GST_VIDEO_FORMAT_AV12
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},{
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.sink = GST_VIDEO_FORMAT_I420_10LE,
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.alpha = GST_VIDEO_FORMAT_I420_10LE,
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.src = GST_VIDEO_FORMAT_A420_10LE
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},
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};
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/* *INDENT-ON* */
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GST_DEBUG_CATEGORY_STATIC (alphacombine_debug);
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#define GST_CAT_DEFAULT (alphacombine_debug)
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struct _GstAlphaCombine
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{
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GstElement parent;
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GstPad *sink_pad;
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GstPad *alpha_pad;
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GstPad *src_pad;
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/* protected by sink_pad stream lock */
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GstBuffer *last_alpha_buffer;
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GstFlowReturn last_flow_ret;
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GMutex buffer_lock;
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GCond buffer_cond;
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GstBuffer *alpha_buffer;
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/* Ref-counted flushing state */
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guint flushing;
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GstVideoInfo sink_vinfo;
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GstVideoInfo alpha_vinfo;
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GstVideoFormat src_format;
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guint sink_format_cookie;
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guint alpha_format_cookie;
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};
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#define gst_alpha_combine_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstAlphaCombine, gst_alpha_combine,
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GST_TYPE_ELEMENT,
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GST_DEBUG_CATEGORY_INIT (alphacombine_debug, "alphacombine", 0,
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"Alpha Combiner"));
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GST_ELEMENT_REGISTER_DEFINE (alpha_combine, "alphacombine",
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GST_RANK_NONE, GST_TYPE_ALPHA_COMBINE);
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static GstStaticPadTemplate gst_alpha_combine_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (SUPPORTED_SINK_FORMATS))
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);
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static GstStaticPadTemplate gst_alpha_combine_alpha_template =
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GST_STATIC_PAD_TEMPLATE ("alpha",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (SUPPORTED_ALPHA_FORMATS))
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);
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static GstStaticPadTemplate gst_alpha_combine_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (SUPPORTED_SRC_FORMATS))
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);
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static void
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gst_alpha_combine_unlock (GstAlphaCombine * self)
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{
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g_mutex_lock (&self->buffer_lock);
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self->flushing++;
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g_cond_broadcast (&self->buffer_cond);
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g_mutex_unlock (&self->buffer_lock);
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}
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static void
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gst_alpha_combine_unlock_stop (GstAlphaCombine * self)
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{
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g_mutex_lock (&self->buffer_lock);
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g_assert (self->flushing);
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self->flushing--;
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/* Reset the format cookies to ensure they are equal */
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if (!self->flushing) {
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self->sink_format_cookie = 0;
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self->alpha_format_cookie = 0;
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}
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g_mutex_unlock (&self->buffer_lock);
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}
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static void
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gst_alpha_combine_reset (GstAlphaCombine * self)
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{
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gst_buffer_replace (&self->alpha_buffer, NULL);
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gst_buffer_replace (&self->last_alpha_buffer, NULL);
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self->last_flow_ret = GST_FLOW_OK;
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}
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/*
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* gst_alpha_combine_negotiate:
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* @self: #GstAlphaCombine pointer
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*
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* Verify that the stream and alpha stream format are compatible and fail
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* otherwise. There is no effort in helping upstream to dynamically negotiate
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* a valid combination to keep the complexity low, and because this would be a
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* very atypical usage.
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*/
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static gboolean
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gst_alpha_combine_negotiate (GstAlphaCombine * self)
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{
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gint i;
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GstVideoFormat src_format = GST_VIDEO_FORMAT_UNKNOWN;
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GstVideoFormat sink_format = GST_VIDEO_INFO_FORMAT (&self->sink_vinfo);
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GstVideoFormat alpha_format = GST_VIDEO_INFO_FORMAT (&self->alpha_vinfo);
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if (self->src_format != GST_VIDEO_FORMAT_UNKNOWN)
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return TRUE;
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for (i = 0; i < G_N_ELEMENTS (format_map); i++) {
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if (format_map[i].sink == sink_format
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&& format_map[i].alpha == alpha_format) {
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src_format = format_map[i].src;
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break;
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}
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}
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if (src_format == GST_VIDEO_FORMAT_UNKNOWN) {
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GST_ELEMENT_ERROR (self, STREAM, FORMAT, ("Unsupported formats."),
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("Cannot combined '%s' and '%s' into any supported transparent format",
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gst_video_format_to_string (sink_format),
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gst_video_format_to_string (alpha_format)));
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return FALSE;
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}
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if (GST_VIDEO_INFO_COLORIMETRY (&self->sink_vinfo).range !=
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GST_VIDEO_INFO_COLORIMETRY (&self->alpha_vinfo).range) {
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GST_ELEMENT_ERROR (self, STREAM, FORMAT, ("Color range mismatch"),
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("We can only combine buffers if they have the same color range."));
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return FALSE;
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}
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self->src_format = src_format;
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return TRUE;
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}
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static GstFlowReturn
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gst_alpha_combine_peek_alpha_buffer (GstAlphaCombine * self,
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GstBuffer ** alpha_buffer)
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{
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g_mutex_lock (&self->buffer_lock);
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while (!self->alpha_buffer && !self->flushing)
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g_cond_wait (&self->buffer_cond, &self->buffer_lock);
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if (self->flushing) {
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g_mutex_unlock (&self->buffer_lock);
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return GST_FLOW_FLUSHING;
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}
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/* Now is a good time to validate the formats, as the alpha_vinfo won't be
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* updated until we signal this alpha_buffer_as being consumed */
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if (!gst_alpha_combine_negotiate (self)) {
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g_mutex_unlock (&self->buffer_lock);
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return GST_FLOW_NOT_NEGOTIATED;
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}
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*alpha_buffer = gst_buffer_ref (self->alpha_buffer);
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g_mutex_unlock (&self->buffer_lock);
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if (GST_BUFFER_FLAG_IS_SET (*alpha_buffer, GST_BUFFER_FLAG_GAP)) {
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if (!self->last_alpha_buffer) {
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GST_ELEMENT_ERROR (self, STREAM, WRONG_TYPE,
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("Cannot handle streams without an initial alpha buffer."), (NULL));
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gst_clear_buffer (alpha_buffer);
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return GST_FLOW_ERROR;
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}
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/* Re-use the last alpha buffer if one is gone missing */
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gst_buffer_replace (alpha_buffer, self->last_alpha_buffer);
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}
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return GST_FLOW_OK;
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}
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static void
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gst_alpha_combine_pop_alpha_buffer (GstAlphaCombine * self,
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GstFlowReturn flow_ret)
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{
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g_mutex_lock (&self->buffer_lock);
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self->last_flow_ret = flow_ret;
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gst_clear_buffer (&self->alpha_buffer);
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g_cond_broadcast (&self->buffer_cond);
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g_mutex_unlock (&self->buffer_lock);
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}
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static GstFlowReturn
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gst_alpha_combine_push_alpha_buffer (GstAlphaCombine * self, GstBuffer * buffer)
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{
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GstFlowReturn ret;
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g_mutex_lock (&self->buffer_lock);
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/* We wait for the alpha_buffer to be consumed and store the buffer for the
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* sink_chain to pick it up */
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while (self->alpha_buffer && !self->flushing)
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g_cond_wait (&self->buffer_cond, &self->buffer_lock);
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if (self->flushing) {
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gst_buffer_unref (buffer);
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g_mutex_unlock (&self->buffer_lock);
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return GST_FLOW_FLUSHING;
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}
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self->alpha_buffer = buffer;
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GST_DEBUG_OBJECT (self, "Stored pending alpha buffer %p", buffer);
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g_cond_signal (&self->buffer_cond);
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ret = self->last_flow_ret;
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g_mutex_unlock (&self->buffer_lock);
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return ret;
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}
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static GstFlowReturn
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gst_alpha_combine_sink_chain (GstPad * pad, GstObject * object,
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GstBuffer * src_buffer)
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{
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GstAlphaCombine *self = GST_ALPHA_COMBINE (object);
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GstFlowReturn ret;
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GstVideoMeta *vmeta;
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GstBuffer *alpha_buffer;
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GstMemory *alpha_mem = NULL;
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gsize alpha_skip = 0;
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gint alpha_stride;
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GstBuffer *buffer;
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guint alpha_plane_idx;
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ret = gst_alpha_combine_peek_alpha_buffer (self, &alpha_buffer);
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if (ret != GST_FLOW_OK)
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return ret;
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GST_DEBUG_OBJECT (self, "Combining buffer %p with alpha buffer %p",
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src_buffer, alpha_buffer);
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vmeta = gst_buffer_get_video_meta (alpha_buffer);
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if (vmeta) {
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guint idx, length;
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if (gst_buffer_find_memory (alpha_buffer, vmeta->offset[GST_VIDEO_COMP_Y],
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1, &idx, &length, &alpha_skip)) {
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alpha_mem = gst_buffer_get_memory (alpha_buffer, idx);
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}
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alpha_stride = vmeta->stride[GST_VIDEO_COMP_Y];
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} else {
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alpha_mem = gst_buffer_get_memory (alpha_buffer, 0);
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alpha_stride = self->alpha_vinfo.stride[GST_VIDEO_COMP_Y];
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}
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if (!alpha_mem) {
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gst_buffer_unref (alpha_buffer);
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gst_buffer_unref (src_buffer);
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GST_ELEMENT_ERROR (self, STREAM, WRONG_TYPE,
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("Invalid alpha video frame."), ("Could not find the plane"));
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return GST_FLOW_ERROR;
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}
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/* FIXME use some GstBuffer cache to reduce run-time allocation */
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buffer = gst_buffer_copy (src_buffer);
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vmeta = gst_buffer_get_video_meta (buffer);
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if (!vmeta)
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vmeta = gst_buffer_add_video_meta (buffer, 0,
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GST_VIDEO_INFO_FORMAT (&self->sink_vinfo),
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GST_VIDEO_INFO_WIDTH (&self->sink_vinfo),
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GST_VIDEO_INFO_HEIGHT (&self->sink_vinfo));
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alpha_skip += gst_buffer_get_size (buffer);
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gst_buffer_append_memory (buffer, alpha_mem);
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alpha_plane_idx = GST_VIDEO_INFO_N_PLANES (&self->sink_vinfo);
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vmeta->offset[alpha_plane_idx] = alpha_skip;
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vmeta->stride[alpha_plane_idx] = alpha_stride;
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vmeta->format = self->src_format;
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vmeta->n_planes = alpha_plane_idx + 1;
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/* Keep the origina GstBuffer alive to make this buffer pool friendly */
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gst_buffer_add_parent_buffer_meta (buffer, src_buffer);
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gst_buffer_add_parent_buffer_meta (buffer, alpha_buffer);
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gst_buffer_replace (&self->last_alpha_buffer, alpha_buffer);
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gst_buffer_unref (src_buffer);
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gst_buffer_unref (alpha_buffer);
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ret = gst_pad_push (self->src_pad, buffer);
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gst_alpha_combine_pop_alpha_buffer (self, ret);
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return ret;
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}
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static GstFlowReturn
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gst_alpha_combine_alpha_chain (GstPad * pad, GstObject * object,
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GstBuffer * buffer)
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{
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GstAlphaCombine *self = GST_ALPHA_COMBINE (object);
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return gst_alpha_combine_push_alpha_buffer (self, buffer);
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}
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static gboolean
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gst_alpha_combine_set_sink_format (GstAlphaCombine * self, GstCaps * caps)
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{
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GstVideoFormat sink_format, src_format = GST_VIDEO_FORMAT_UNKNOWN;
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GstEvent *event;
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gint i;
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gboolean ret;
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if (!gst_video_info_from_caps (&self->sink_vinfo, caps)) {
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GST_ELEMENT_ERROR (self, STREAM, FORMAT, ("Invalid video format"), (NULL));
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return FALSE;
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}
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sink_format = GST_VIDEO_INFO_FORMAT (&self->sink_vinfo);
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/* The sink format determines the src format, though we cannot fully validate
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* the negotiation here, since we don't have the alpha format yet. */
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for (i = 0; i < G_N_ELEMENTS (format_map); i++) {
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if (format_map[i].sink == sink_format) {
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src_format = format_map[i].src;
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break;
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}
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}
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if (src_format == GST_VIDEO_FORMAT_UNKNOWN) {
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GST_ELEMENT_ERROR (self, STREAM, FORMAT, ("Unsupported formats."),
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("Sink format '%s' not supported.",
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gst_video_format_to_string (sink_format)));
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return FALSE;
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}
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caps = gst_caps_copy (caps);
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gst_caps_set_simple (caps, "format", G_TYPE_STRING,
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gst_video_format_to_string (src_format), NULL);
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event = gst_event_new_caps (caps);
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gst_caps_unref (caps);
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ret = gst_pad_push_event (self->src_pad, event);
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/* signal the sink format change */
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g_mutex_lock (&self->buffer_lock);
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self->sink_format_cookie++;
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g_cond_signal (&self->buffer_cond);
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g_mutex_unlock (&self->buffer_lock);
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return ret;
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}
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static gboolean
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gst_alpha_combine_set_alpha_format (GstAlphaCombine * self, GstCaps * caps)
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{
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/* We wait for the alpha_buffer to be consumed, so that we don't pick the
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* caps too soon */
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g_mutex_lock (&self->buffer_lock);
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/* We wait for the alpha_buffer to be consumed and store the buffer for the
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* sink_chain to pick it up */
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while (self->alpha_buffer && !self->flushing)
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g_cond_wait (&self->buffer_cond, &self->buffer_lock);
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if (self->flushing) {
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g_mutex_unlock (&self->buffer_lock);
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return GST_FLOW_FLUSHING;
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}
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if (!gst_video_info_from_caps (&self->alpha_vinfo, caps)) {
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g_mutex_unlock (&self->buffer_lock);
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GST_ELEMENT_ERROR (self, STREAM, FORMAT, ("Invalid video format"), (NULL));
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return FALSE;
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}
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self->alpha_format_cookie++;
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/* wait for the matching format change on the sink pad */
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while (self->alpha_format_cookie != self->sink_format_cookie &&
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!self->flushing)
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g_cond_wait (&self->buffer_cond, &self->buffer_lock);
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g_mutex_unlock (&self->buffer_lock);
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return TRUE;
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}
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static void
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gst_alpha_combine_handle_gap (GstAlphaCombine * self)
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{
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GstBuffer *gap_buffer = gst_buffer_new ();
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GST_BUFFER_FLAG_SET (gap_buffer, GST_BUFFER_FLAG_GAP);
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gst_alpha_combine_push_alpha_buffer (self, gap_buffer);
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}
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static gboolean
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gst_alpha_combine_sink_event (GstPad * pad, GstObject * object,
|
|
GstEvent * event)
|
|
{
|
|
GstAlphaCombine *self = GST_ALPHA_COMBINE (object);
|
|
|
|
switch (event->type) {
|
|
case GST_EVENT_FLUSH_START:
|
|
gst_alpha_combine_unlock (self);
|
|
break;
|
|
case GST_EVENT_FLUSH_STOP:
|
|
gst_alpha_combine_unlock_stop (self);
|
|
break;
|
|
case GST_EVENT_CAPS:
|
|
{
|
|
GstCaps *caps;
|
|
gboolean ret;
|
|
|
|
gst_event_parse_caps (event, &caps);
|
|
ret = gst_alpha_combine_set_sink_format (self, caps);
|
|
gst_event_unref (event);
|
|
|
|
return ret;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return gst_pad_event_default (pad, object, event);
|
|
}
|
|
|
|
static gboolean
|
|
gst_alpha_combine_alpha_event (GstPad * pad, GstObject * object,
|
|
GstEvent * event)
|
|
{
|
|
GstAlphaCombine *self = GST_ALPHA_COMBINE (object);
|
|
|
|
switch (event->type) {
|
|
case GST_EVENT_FLUSH_START:
|
|
gst_alpha_combine_unlock (self);
|
|
break;
|
|
case GST_EVENT_FLUSH_STOP:
|
|
gst_alpha_combine_unlock_stop (self);
|
|
gst_alpha_combine_reset (self);
|
|
break;
|
|
case GST_EVENT_CAPS:
|
|
{
|
|
GstCaps *caps;
|
|
gst_event_parse_caps (event, &caps);
|
|
gst_alpha_combine_set_alpha_format (self, caps);
|
|
break;
|
|
}
|
|
case GST_EVENT_GAP:
|
|
{
|
|
gst_alpha_combine_handle_gap (self);
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Events are being duplicated, over both branches, so let's just drop this
|
|
* secondary stream and use the one from the main stream. */
|
|
gst_event_unref (event);
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_alpha_combine_sink_query (GstPad * pad, GstObject * object,
|
|
GstQuery * query)
|
|
{
|
|
switch (query->type) {
|
|
case GST_QUERY_ALLOCATION:
|
|
{
|
|
int i;
|
|
|
|
if (!gst_pad_query_default (pad, object, query))
|
|
return FALSE;
|
|
|
|
/* Ensure NULL pool because it cannot be shared between the 2 decoders.
|
|
* Ideally, we should cache the downstream query and use it for both
|
|
* decoders, but it is hard to know when we should refresh it */
|
|
for (i = 0; i < gst_query_get_n_allocation_pools (query); i++) {
|
|
guint size = 0, min = 0, max = 0;
|
|
gst_query_parse_nth_allocation_pool (query, i, NULL, &size, &min, &max);
|
|
gst_query_set_nth_allocation_pool (query, i, NULL, size, min, max);
|
|
}
|
|
|
|
return TRUE;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return gst_pad_query_default (pad, object, query);
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_alpha_combine_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstAlphaCombine *self = GST_ALPHA_COMBINE (element);
|
|
GstStateChangeReturn ret;
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
gst_alpha_combine_unlock_stop (self);
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
gst_alpha_combine_unlock (self);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
gst_alpha_combine_reset (self);
|
|
self->src_format = GST_VIDEO_FORMAT_UNKNOWN;
|
|
gst_video_info_init (&self->sink_vinfo);
|
|
gst_video_info_init (&self->alpha_vinfo);
|
|
self->sink_format_cookie = 0;
|
|
self->alpha_format_cookie = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
gst_alpha_combine_dispose (GObject * object)
|
|
{
|
|
GstAlphaCombine *self = GST_ALPHA_COMBINE (object);
|
|
|
|
g_clear_object (&self->sink_pad);
|
|
g_clear_object (&self->alpha_pad);
|
|
g_clear_object (&self->src_pad);
|
|
|
|
G_OBJECT_CLASS (parent_class)->dispose (object);
|
|
}
|
|
|
|
static void
|
|
gst_alpha_combine_finalize (GObject * object)
|
|
{
|
|
GstAlphaCombine *self = GST_ALPHA_COMBINE (object);
|
|
|
|
g_mutex_clear (&self->buffer_lock);
|
|
g_cond_clear (&self->buffer_cond);
|
|
|
|
G_OBJECT_CLASS (parent_class)->finalize (object);
|
|
}
|
|
|
|
static void
|
|
gst_alpha_combine_class_init (GstAlphaCombineClass * klass)
|
|
{
|
|
GstElementClass *element_class = (GstElementClass *) klass;
|
|
GObjectClass *object_class = (GObjectClass *) klass;
|
|
|
|
gst_element_class_set_static_metadata (element_class,
|
|
"Alpha Combiner", "Codec/Demuxer",
|
|
"Use luma from an opaque stream as alpha plane on another",
|
|
"Nicolas Dufresne <nicolas.dufresne@collabora.com>");
|
|
|
|
gst_element_class_add_static_pad_template (element_class,
|
|
&gst_alpha_combine_sink_template);
|
|
gst_element_class_add_static_pad_template (element_class,
|
|
&gst_alpha_combine_alpha_template);
|
|
gst_element_class_add_static_pad_template (element_class,
|
|
&gst_alpha_combine_src_template);
|
|
|
|
element_class->change_state =
|
|
GST_DEBUG_FUNCPTR (gst_alpha_combine_change_state);
|
|
|
|
object_class->dispose = GST_DEBUG_FUNCPTR (gst_alpha_combine_dispose);
|
|
object_class->finalize = GST_DEBUG_FUNCPTR (gst_alpha_combine_finalize);
|
|
}
|
|
|
|
static void
|
|
gst_alpha_combine_init (GstAlphaCombine * self)
|
|
{
|
|
gst_element_create_all_pads (GST_ELEMENT (self));
|
|
self->sink_pad = gst_element_get_static_pad (GST_ELEMENT (self), "sink");
|
|
self->alpha_pad = gst_element_get_static_pad (GST_ELEMENT (self), "alpha");
|
|
self->src_pad = gst_element_get_static_pad (GST_ELEMENT (self), "src");
|
|
self->flushing = 1;
|
|
|
|
g_mutex_init (&self->buffer_lock);
|
|
g_cond_init (&self->buffer_cond);
|
|
|
|
GST_PAD_SET_PROXY_SCHEDULING (self->sink_pad);
|
|
GST_PAD_SET_PROXY_SCHEDULING (self->src_pad);
|
|
|
|
GST_PAD_SET_PROXY_ALLOCATION (self->sink_pad);
|
|
GST_PAD_SET_PROXY_ALLOCATION (self->alpha_pad);
|
|
|
|
gst_pad_set_chain_function (self->sink_pad, gst_alpha_combine_sink_chain);
|
|
gst_pad_set_chain_function (self->alpha_pad, gst_alpha_combine_alpha_chain);
|
|
|
|
gst_pad_set_event_function (self->sink_pad, gst_alpha_combine_sink_event);
|
|
gst_pad_set_event_function (self->alpha_pad, gst_alpha_combine_alpha_event);
|
|
|
|
gst_pad_set_query_function (self->sink_pad, gst_alpha_combine_sink_query);
|
|
gst_pad_set_query_function (self->alpha_pad, gst_alpha_combine_sink_query);
|
|
}
|