mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-19 18:40:31 +00:00
4315a4b54d
Simplifies a deduplicates a lot of code in elements retrieving/setting the local OpenGL context.
463 lines
14 KiB
C
463 lines
14 KiB
C
/*
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* GStreamer
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* Copyright (C) 2015 Matthew Waters <matthew@centricular.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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/video/gstvideometa.h>
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#include <gst/gl/gl.h>
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#include <gst/gl/gstglutils_private.h>
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/**
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* SECTION:gstglbasefilter
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* @short_description: #GstBaseTransform subclass for transforming OpenGL resources
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* @title: GstGLBaseFilter
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* @see_also: #GstBaseTransform
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*
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* #GstGLBaseFilter handles the nitty gritty details of retrieving an OpenGL
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* context. It also provided some wrappers around #GstBaseTransform's
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* start(), stop() and set_caps() virtual methods that ensure an OpenGL context
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* is available and current in the calling thread.
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*/
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#define GST_CAT_DEFAULT gst_gl_base_filter_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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#define GST_GL_BASE_FILTER_GET_PRIVATE(o) \
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(G_TYPE_INSTANCE_GET_PRIVATE((o), GST_TYPE_GL_BASE_FILTER, GstGLBaseFilterPrivate))
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struct _GstGLBaseFilterPrivate
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{
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GstGLContext *other_context;
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gboolean gl_result;
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gboolean gl_started;
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};
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/* Properties */
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enum
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{
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PROP_0,
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PROP_CONTEXT
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};
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#define gst_gl_base_filter_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstGLBaseFilter, gst_gl_base_filter,
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GST_TYPE_BASE_TRANSFORM, GST_DEBUG_CATEGORY_INIT (gst_gl_base_filter_debug,
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"glbasefilter", 0, "glbasefilter element"););
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static void gst_gl_base_filter_finalize (GObject * object);
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static void gst_gl_base_filter_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_gl_base_filter_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_gl_base_filter_set_context (GstElement * element,
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GstContext * context);
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static GstStateChangeReturn gst_gl_base_filter_change_state (GstElement *
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element, GstStateChange transition);
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static gboolean gst_gl_base_filter_query (GstBaseTransform * trans,
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GstPadDirection direction, GstQuery * query);
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static void gst_gl_base_filter_reset (GstGLBaseFilter * filter);
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static gboolean gst_gl_base_filter_start (GstBaseTransform * bt);
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static gboolean gst_gl_base_filter_stop (GstBaseTransform * bt);
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static gboolean gst_gl_base_filter_set_caps (GstBaseTransform * bt,
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GstCaps * incaps, GstCaps * outcaps);
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static gboolean gst_gl_base_filter_decide_allocation (GstBaseTransform * trans,
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GstQuery * query);
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/* GstGLContextThreadFunc */
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static void gst_gl_base_filter_gl_start (GstGLContext * context, gpointer data);
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static void gst_gl_base_filter_gl_stop (GstGLContext * context, gpointer data);
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static gboolean gst_gl_base_filter_default_gl_start (GstGLBaseFilter * filter);
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static void gst_gl_base_filter_default_gl_stop (GstGLBaseFilter * filter);
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static void
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gst_gl_base_filter_class_init (GstGLBaseFilterClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *element_class;
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g_type_class_add_private (klass, sizeof (GstGLBaseFilterPrivate));
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gobject_class = (GObjectClass *) klass;
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element_class = GST_ELEMENT_CLASS (klass);
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gobject_class->finalize = gst_gl_base_filter_finalize;
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gobject_class->set_property = gst_gl_base_filter_set_property;
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gobject_class->get_property = gst_gl_base_filter_get_property;
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GST_BASE_TRANSFORM_CLASS (klass)->query = gst_gl_base_filter_query;
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GST_BASE_TRANSFORM_CLASS (klass)->set_caps = gst_gl_base_filter_set_caps;
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GST_BASE_TRANSFORM_CLASS (klass)->start = gst_gl_base_filter_start;
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GST_BASE_TRANSFORM_CLASS (klass)->stop = gst_gl_base_filter_stop;
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GST_BASE_TRANSFORM_CLASS (klass)->decide_allocation =
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gst_gl_base_filter_decide_allocation;
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element_class->set_context = gst_gl_base_filter_set_context;
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element_class->change_state = gst_gl_base_filter_change_state;
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g_object_class_install_property (gobject_class, PROP_CONTEXT,
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g_param_spec_object ("context",
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"OpenGL context",
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"Get OpenGL context",
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GST_TYPE_GL_CONTEXT, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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klass->supported_gl_api = GST_GL_API_ANY;
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klass->gl_start = gst_gl_base_filter_default_gl_start;
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klass->gl_stop = gst_gl_base_filter_default_gl_stop;
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}
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static void
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gst_gl_base_filter_init (GstGLBaseFilter * filter)
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{
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gst_base_transform_set_qos_enabled (GST_BASE_TRANSFORM (filter), TRUE);
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filter->priv = GST_GL_BASE_FILTER_GET_PRIVATE (filter);
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}
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static void
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gst_gl_base_filter_finalize (GObject * object)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (object);
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gst_caps_replace (&filter->in_caps, NULL);
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gst_caps_replace (&filter->out_caps, NULL);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_gl_base_filter_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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switch (prop_id) {
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_gl_base_filter_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (object);
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switch (prop_id) {
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case PROP_CONTEXT:
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g_value_set_object (value, filter->context);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_gl_base_filter_set_context (GstElement * element, GstContext * context)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (element);
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GstGLBaseFilterClass *filter_class = GST_GL_BASE_FILTER_GET_CLASS (filter);
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gst_gl_handle_set_context (element, context, &filter->display,
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&filter->priv->other_context);
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if (filter->display)
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gst_gl_display_filter_gl_api (filter->display,
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filter_class->supported_gl_api);
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GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
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}
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static gboolean
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_find_local_gl_context (GstGLBaseFilter * filter)
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{
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if (gst_gl_query_local_gl_context (GST_ELEMENT (filter), GST_PAD_SRC,
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&filter->context))
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return TRUE;
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if (gst_gl_query_local_gl_context (GST_ELEMENT (filter), GST_PAD_SINK,
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&filter->context))
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return TRUE;
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return FALSE;
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}
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static gboolean
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gst_gl_base_filter_query (GstBaseTransform * trans, GstPadDirection direction,
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GstQuery * query)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (trans);
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_ALLOCATION:
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{
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if (direction == GST_PAD_SINK
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&& gst_base_transform_is_passthrough (trans)) {
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_find_local_gl_context (filter);
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return gst_pad_peer_query (GST_BASE_TRANSFORM_SRC_PAD (trans), query);
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}
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break;
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}
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case GST_QUERY_CONTEXT:
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{
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if (gst_gl_handle_context_query ((GstElement *) filter, query,
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filter->display, filter->context, filter->priv->other_context))
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return TRUE;
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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 GST_BASE_TRANSFORM_CLASS (parent_class)->query (trans, direction,
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query);
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}
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static void
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gst_gl_base_filter_reset (GstGLBaseFilter * filter)
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{
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GstGLBaseFilterClass *filter_class = GST_GL_BASE_FILTER_GET_CLASS (filter);
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if (filter->context) {
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if (filter_class->gl_stop != NULL) {
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gst_gl_context_thread_add (filter->context, gst_gl_base_filter_gl_stop,
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filter);
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}
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gst_object_unref (filter->context);
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filter->context = NULL;
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}
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}
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static gboolean
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gst_gl_base_filter_start (GstBaseTransform * bt)
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{
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return TRUE;
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}
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static gboolean
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gst_gl_base_filter_stop (GstBaseTransform * bt)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (bt);
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gst_gl_base_filter_reset (filter);
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return TRUE;
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}
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static gboolean
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gst_gl_base_filter_default_gl_start (GstGLBaseFilter * filter)
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{
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return TRUE;
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}
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static void
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gst_gl_base_filter_gl_start (GstGLContext * context, gpointer data)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (data);
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GstGLBaseFilterClass *filter_class = GST_GL_BASE_FILTER_GET_CLASS (filter);
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gst_gl_insert_debug_marker (filter->context,
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"starting element %s", GST_OBJECT_NAME (filter));
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filter->priv->gl_result = filter_class->gl_start (filter);
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}
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static void
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gst_gl_base_filter_default_gl_stop (GstGLBaseFilter * filter)
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{
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}
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static void
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gst_gl_base_filter_gl_stop (GstGLContext * context, gpointer data)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (data);
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GstGLBaseFilterClass *filter_class = GST_GL_BASE_FILTER_GET_CLASS (filter);
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gst_gl_insert_debug_marker (filter->context,
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"stopping element %s", GST_OBJECT_NAME (filter));
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if (filter->priv->gl_started)
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filter_class->gl_stop (filter);
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filter->priv->gl_started = FALSE;
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}
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static void
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_gl_set_caps (GstGLContext * context, GstGLBaseFilter * filter)
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{
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GstGLBaseFilterClass *filter_class = GST_GL_BASE_FILTER_GET_CLASS (filter);
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if (filter_class->gl_set_caps)
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filter->priv->gl_result =
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filter_class->gl_set_caps (filter, filter->in_caps, filter->out_caps);
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}
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static gboolean
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gst_gl_base_filter_decide_allocation (GstBaseTransform * trans,
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GstQuery * query)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (trans);
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GstGLBaseFilterClass *filter_class = GST_GL_BASE_FILTER_GET_CLASS (filter);
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GError *error = NULL;
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gboolean new_context = FALSE;
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if (!filter->context)
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new_context = TRUE;
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_find_local_gl_context (filter);
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if (!filter->context) {
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GST_OBJECT_LOCK (filter->display);
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do {
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if (filter->context)
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gst_object_unref (filter->context);
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/* just get a GL context. we don't care */
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filter->context =
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gst_gl_display_get_gl_context_for_thread (filter->display, NULL);
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if (!filter->context) {
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if (!gst_gl_display_create_context (filter->display,
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filter->priv->other_context, &filter->context, &error)) {
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GST_OBJECT_UNLOCK (filter->display);
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goto context_error;
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}
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}
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} while (!gst_gl_display_add_context (filter->display, filter->context));
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GST_OBJECT_UNLOCK (filter->display);
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}
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if (new_context || !filter->priv->gl_started) {
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if (filter->priv->gl_started)
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gst_gl_context_thread_add (filter->context, gst_gl_base_filter_gl_stop,
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filter);
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{
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GstGLAPI current_gl_api = gst_gl_context_get_gl_api (filter->context);
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if ((current_gl_api & filter_class->supported_gl_api) == 0)
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goto unsupported_gl_api;
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}
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gst_gl_context_thread_add (filter->context, gst_gl_base_filter_gl_start,
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filter);
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if (!filter->priv->gl_result)
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goto error;
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}
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gst_gl_context_thread_add (filter->context,
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(GstGLContextThreadFunc) _gl_set_caps, filter);
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if (!filter->priv->gl_result)
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goto error;
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return GST_BASE_TRANSFORM_CLASS (parent_class)->decide_allocation (trans,
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query);
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unsupported_gl_api:
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{
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GstGLAPI gl_api = gst_gl_context_get_gl_api (filter->context);
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gchar *gl_api_str = gst_gl_api_to_string (gl_api);
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gchar *supported_gl_api_str =
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gst_gl_api_to_string (filter_class->supported_gl_api);
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GST_ELEMENT_ERROR (filter, RESOURCE, BUSY,
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("GL API's not compatible context: %s supported: %s", gl_api_str,
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supported_gl_api_str), (NULL));
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g_free (supported_gl_api_str);
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g_free (gl_api_str);
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return FALSE;
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}
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context_error:
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{
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GST_ELEMENT_ERROR (trans, RESOURCE, NOT_FOUND, ("%s", error->message),
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(NULL));
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g_clear_error (&error);
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return FALSE;
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}
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error:
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{
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GST_ELEMENT_ERROR (trans, LIBRARY, INIT,
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("Subclass failed to initialize."), (NULL));
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return FALSE;
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}
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}
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static gboolean
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gst_gl_base_filter_set_caps (GstBaseTransform * bt, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (bt);
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gst_caps_replace (&filter->in_caps, incaps);
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gst_caps_replace (&filter->out_caps, outcaps);
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return TRUE;
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}
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static GstStateChangeReturn
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gst_gl_base_filter_change_state (GstElement * element,
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GstStateChange transition)
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{
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GstGLBaseFilter *filter = GST_GL_BASE_FILTER (element);
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GstGLBaseFilterClass *filter_class = GST_GL_BASE_FILTER_GET_CLASS (filter);
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GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
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GST_DEBUG_OBJECT (filter, "changing state: %s => %s",
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gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
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gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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if (!gst_gl_ensure_element_data (element, &filter->display,
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&filter->priv->other_context))
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return GST_STATE_CHANGE_FAILURE;
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gst_gl_display_filter_gl_api (filter->display,
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filter_class->supported_gl_api);
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret == GST_STATE_CHANGE_FAILURE)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_NULL:
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if (filter->priv->other_context) {
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gst_object_unref (filter->priv->other_context);
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filter->priv->other_context = NULL;
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}
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if (filter->display) {
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gst_object_unref (filter->display);
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filter->display = NULL;
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}
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break;
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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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