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gtk2/modules/media/gtkgstsink.c
Chun-wei Fan 16f307b305 media-gstreamer: Provide fallback mode for playback 
Make the "gl-context" property of the GstGLSink readable as well so that
we can query whether the GstGLContext sharing really succeeded.  If it
did, then we proceed to playback our video using the glimagesink as we
did before.  If it didn't, throw out the GtkGstSink we were creating, and
re-create the GtkGstSink without the "gl-context" property, meaning that
we won't be using the glimagesink in this case.
2021-05-24 19:04:37 +08:00

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/*
* GStreamer
* Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "gtkgstsinkprivate.h"
#include "gtkgstpaintableprivate.h"
#include "gtkintl.h"
#if GST_GL_HAVE_WINDOW_X11 && (GST_GL_HAVE_PLATFORM_GLX || GST_GL_HAVE_PLATFORM_EGL) && defined (GDK_WINDOWING_X11)
#define HAVE_GST_X11_SUPPORT
#include <gdk/x11/gdkx.h>
#if GST_GL_HAVE_PLATFORM_GLX
#include <gst/gl/x11/gstgldisplay_x11.h>
#endif
#endif
#if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND)
#define HAVE_GST_WAYLAND_SUPPORT
#include <gdk/wayland/gdkwayland.h>
#include <gst/gl/wayland/gstgldisplay_wayland.h>
#endif
#if GST_GL_HAVE_WINDOW_WIN32 && (GST_GL_HAVE_PLATFORM_WGL || GST_GL_HAVE_PLATFORM_EGL) && defined (GDK_WINDOWING_WIN32)
#include <gdk/win32/gdkwin32.h>
#include <epoxy/wgl.h>
#endif
#if GST_GL_HAVE_PLATFORM_EGL && (GST_GL_HAVE_WINDOW_WIN32 || GST_GL_HAVE_WINDOW_X11)
#include <gst/gl/egl/gstgldisplay_egl.h>
#endif
#include <gst/gl/gstglfuncs.h>
enum {
PROP_0,
PROP_PAINTABLE,
PROP_GL_CONTEXT,
N_PROPS,
};
GST_DEBUG_CATEGORY (gtk_debug_gst_sink);
#define GST_CAT_DEFAULT gtk_debug_gst_sink
#define FORMATS "{ BGRA, ARGB, RGBA, ABGR, RGB, BGR }"
#define NOGL_CAPS GST_VIDEO_CAPS_MAKE (FORMATS)
static GstStaticPadTemplate gtk_gst_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw(" GST_CAPS_FEATURE_MEMORY_GL_MEMORY "), "
"format = (string) RGBA, "
"width = " GST_VIDEO_SIZE_RANGE ", "
"height = " GST_VIDEO_SIZE_RANGE ", "
"framerate = " GST_VIDEO_FPS_RANGE ", "
"texture-target = (string) 2D"
"; " NOGL_CAPS)
);
G_DEFINE_TYPE_WITH_CODE (GtkGstSink, gtk_gst_sink,
GST_TYPE_VIDEO_SINK,
GST_DEBUG_CATEGORY_INIT (gtk_debug_gst_sink,
"gtkgstsink", 0, "GtkGstMediaFile Video Sink"));
static GParamSpec *properties[N_PROPS] = { NULL, };
static void
gtk_gst_sink_get_times (GstBaseSink *bsink,
GstBuffer *buf,
GstClockTime *start,
GstClockTime *end)
{
GtkGstSink *gtk_sink;
gtk_sink = GTK_GST_SINK (bsink);
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf))
{
*start = GST_BUFFER_TIMESTAMP (buf);
if (GST_BUFFER_DURATION_IS_VALID (buf))
*end = *start + GST_BUFFER_DURATION (buf);
else
{
if (GST_VIDEO_INFO_FPS_N (&gtk_sink->v_info) > 0)
{
*end = *start +
gst_util_uint64_scale_int (GST_SECOND,
GST_VIDEO_INFO_FPS_D (&gtk_sink->v_info),
GST_VIDEO_INFO_FPS_N (&gtk_sink->v_info));
}
}
}
}
static GstCaps *
gtk_gst_sink_get_caps (GstBaseSink *bsink,
GstCaps *filter)
{
GtkGstSink *self = GTK_GST_SINK (bsink);
GstCaps *tmp;
GstCaps *result;
if (self->gst_context)
{
tmp = gst_pad_get_pad_template_caps (GST_BASE_SINK_PAD (bsink));
}
else
{
tmp = gst_caps_from_string (NOGL_CAPS);
}
GST_DEBUG_OBJECT (self, "advertising own caps %" GST_PTR_FORMAT, tmp);
if (filter)
{
GST_DEBUG_OBJECT (self, "intersecting with filter caps %" GST_PTR_FORMAT, filter);
result = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
}
else
{
result = tmp;
}
GST_DEBUG_OBJECT (self, "returning caps: %" GST_PTR_FORMAT, result);
return result;
}
static gboolean
gtk_gst_sink_set_caps (GstBaseSink *bsink,
GstCaps *caps)
{
GtkGstSink *self = GTK_GST_SINK (bsink);
GST_DEBUG_OBJECT (self, "set caps with %" GST_PTR_FORMAT, caps);
if (!gst_video_info_from_caps (&self->v_info, caps))
return FALSE;
return TRUE;
}
static gboolean
gtk_gst_sink_query (GstBaseSink *bsink,
GstQuery *query)
{
GtkGstSink *self = GTK_GST_SINK (bsink);
if (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT &&
self->gst_display != NULL &&
gst_gl_handle_context_query (GST_ELEMENT (self), query, self->gst_display, self->gst_context, self->gst_app_context))
return TRUE;
return GST_BASE_SINK_CLASS (gtk_gst_sink_parent_class)->query (bsink, query);
}
static gboolean
gtk_gst_sink_propose_allocation (GstBaseSink *bsink,
GstQuery *query)
{
GtkGstSink *self = GTK_GST_SINK (bsink);
GstBufferPool *pool = NULL;
GstStructure *config;
GstCaps *caps;
guint size;
gboolean need_pool;
GstVideoInfo info;
if (!self->gst_context)
return FALSE;
gst_query_parse_allocation (query, &caps, &need_pool);
if (caps == NULL)
{
GST_DEBUG_OBJECT (bsink, "no caps specified");
return FALSE;
}
if (!gst_caps_features_contains (gst_caps_get_features (caps, 0), GST_CAPS_FEATURE_MEMORY_GL_MEMORY))
return FALSE;
if (!gst_video_info_from_caps (&info, caps))
{
GST_DEBUG_OBJECT (self, "invalid caps specified");
return FALSE;
}
/* the normal size of a frame */
size = info.size;
if (need_pool)
{
GST_DEBUG_OBJECT (self, "create new pool");
pool = gst_gl_buffer_pool_new (self->gst_context);
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, caps, size, 0, 0);
gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_GL_SYNC_META);
if (!gst_buffer_pool_set_config (pool, config))
{
GST_DEBUG_OBJECT (bsink, "failed setting config");
gst_object_unref (pool);
return FALSE;
}
}
/* we need at least 2 buffer because we hold on to the last one */
gst_query_add_allocation_pool (query, pool, size, 2, 0);
if (pool)
gst_object_unref (pool);
/* we also support various metadata */
gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, 0);
if (self->gst_context->gl_vtable->FenceSync)
gst_query_add_allocation_meta (query, GST_GL_SYNC_META_API_TYPE, 0);
return TRUE;
}
static GdkMemoryFormat
gtk_gst_memory_format_from_video (GstVideoFormat format)
{
switch ((guint) format)
{
case GST_VIDEO_FORMAT_BGRA:
return GDK_MEMORY_B8G8R8A8;
case GST_VIDEO_FORMAT_ARGB:
return GDK_MEMORY_A8R8G8B8;
case GST_VIDEO_FORMAT_RGBA:
return GDK_MEMORY_R8G8B8A8;
case GST_VIDEO_FORMAT_ABGR:
return GDK_MEMORY_A8B8G8R8;
case GST_VIDEO_FORMAT_RGB:
return GDK_MEMORY_R8G8B8;
case GST_VIDEO_FORMAT_BGR:
return GDK_MEMORY_B8G8R8;
default:
g_assert_not_reached ();
return GDK_MEMORY_A8R8G8B8;
}
}
static void
video_frame_free (GstVideoFrame *frame)
{
gst_video_frame_unmap (frame);
g_free (frame);
}
static GdkTexture *
gtk_gst_sink_texture_from_buffer (GtkGstSink *self,
GstBuffer *buffer,
double *pixel_aspect_ratio)
{
GstVideoFrame *frame = g_new (GstVideoFrame, 1);
GdkTexture *texture;
if (self->gdk_context &&
gst_video_frame_map (frame, &self->v_info, buffer, GST_MAP_READ | GST_MAP_GL))
{
GstGLSyncMeta *sync_meta;
sync_meta = gst_buffer_get_gl_sync_meta (buffer);
if (sync_meta) {
gst_gl_sync_meta_set_sync_point (sync_meta, self->gst_context);
gst_gl_sync_meta_wait (sync_meta, self->gst_context);
}
texture = gdk_gl_texture_new (self->gdk_context,
*(guint *) frame->data[0],
frame->info.width,
frame->info.height,
(GDestroyNotify) video_frame_free,
frame);
*pixel_aspect_ratio = ((double) frame->info.par_n) / ((double) frame->info.par_d);
}
else if (gst_video_frame_map (frame, &self->v_info, buffer, GST_MAP_READ))
{
GBytes *bytes;
bytes = g_bytes_new_with_free_func (frame->data[0],
frame->info.height * frame->info.stride[0],
(GDestroyNotify) video_frame_free,
frame);
texture = gdk_memory_texture_new (frame->info.width,
frame->info.height,
gtk_gst_memory_format_from_video (GST_VIDEO_FRAME_FORMAT (frame)),
bytes,
frame->info.stride[0]);
g_bytes_unref (bytes);
*pixel_aspect_ratio = ((double) frame->info.par_n) / ((double) frame->info.par_d);
}
else
{
GST_ERROR_OBJECT (self, "Could not convert buffer to texture.");
texture = NULL;
g_free (frame);
}
return texture;
}
static GstFlowReturn
gtk_gst_sink_show_frame (GstVideoSink *vsink,
GstBuffer *buf)
{
GtkGstSink *self;
GdkTexture *texture;
double pixel_aspect_ratio;
GST_TRACE ("rendering buffer:%p", buf);
self = GTK_GST_SINK (vsink);
GST_OBJECT_LOCK (self);
texture = gtk_gst_sink_texture_from_buffer (self, buf, &pixel_aspect_ratio);
if (texture)
{
gtk_gst_paintable_queue_set_texture (self->paintable, texture, pixel_aspect_ratio);
g_object_unref (texture);
}
GST_OBJECT_UNLOCK (self);
return GST_FLOW_OK;
}
#if GST_GL_HAVE_WINDOW_WIN32 && (GST_GL_HAVE_PLATFORM_WGL || GST_GL_HAVE_PLATFORM_EGL) && defined (GDK_WINDOWING_WIN32)
#define HANDLE_EXTERNAL_WGL_MAKE_CURRENT(ctx) handle_wgl_makecurrent(ctx)
#define DEACTIVATE_WGL_CONTEXT(ctx) deactivate_gdk_wgl_context(ctx)
#define REACTIVATE_WGL_CONTEXT(ctx) reactivate_gdk_wgl_context(ctx)
static void
handle_wgl_makecurrent (GdkGLContext *ctx)
{
if (!gdk_gl_context_get_use_es (ctx))
epoxy_handle_external_wglMakeCurrent();
}
static void
deactivate_gdk_wgl_context (GdkGLContext *ctx)
{
if (!gdk_gl_context_get_use_es (ctx))
{
HDC hdc = GetDC (GDK_SURFACE_HWND (gdk_gl_context_get_surface (ctx)));
wglMakeCurrent (hdc, NULL);
}
}
static void
reactivate_gdk_wgl_context (GdkGLContext *ctx)
{
if (!gdk_gl_context_get_use_es (ctx))
gdk_gl_context_make_current (ctx);
}
/*
* Unfortunately, libepoxy does not offer a way to allow us to safely call
* gst_gl_context_get_current_gl_api() on a WGL context that underlies a
* GdkGLContext after we notify libepoxy an external wglMakeCurrent() has
* been called (which is required for the first gdk_gl_context_make_current()
* call in gtk_gst_sink_initialize_gl(), for instance), so we can't do
* gst_gl_context_get_current_gl_api() directly on WGL contexts that underlies
* GdkGLContext's. So, we just ask GDK about our WGL context, since it already
* knows what kind of WGL context we have there...
*/
static gboolean
check_win32_gst_gl_api (GdkGLContext *ctx,
GstGLPlatform *platform,
GstGLAPI *gl_api)
{
gboolean is_gles = gdk_gl_context_get_use_es (ctx);
g_return_val_if_fail (*gl_api == GST_GL_API_NONE, FALSE);
*platform = is_gles ? GST_GL_PLATFORM_EGL : GST_GL_PLATFORM_WGL;
if (is_gles)
*gl_api = gst_gl_context_get_current_gl_api (*platform, NULL, NULL);
else
*gl_api = gdk_gl_context_is_legacy (ctx) ? GST_GL_API_OPENGL : GST_GL_API_OPENGL3;
return is_gles;
}
#else
#define HANDLE_EXTERNAL_WGL_MAKE_CURRENT(ctx)
#define DEACTIVATE_WGL_CONTEXT(ctx)
#define REACTIVATE_WGL_CONTEXT(ctx)
#endif
static gboolean
gtk_gst_sink_initialize_gl (GtkGstSink *self)
{
GdkDisplay *display;
GError *error = NULL;
GstGLPlatform platform = GST_GL_PLATFORM_NONE;
GstGLAPI gl_api = GST_GL_API_NONE;
guintptr gl_handle = 0;
gboolean succeeded = FALSE;
display = gdk_gl_context_get_display (self->gdk_context);
HANDLE_EXTERNAL_WGL_MAKE_CURRENT (self->gdk_context);
gdk_gl_context_make_current (self->gdk_context);
#ifdef HAVE_GST_X11_SUPPORT
if (GDK_IS_X11_DISPLAY (display))
{
gpointer display_ptr;
#if GST_GL_HAVE_PLATFORM_EGL
display_ptr = gdk_x11_display_get_egl_display (display);
if (display_ptr)
{
GST_DEBUG_OBJECT (self, "got EGL on X11!");
platform = GST_GL_PLATFORM_EGL;
self->gst_display = GST_GL_DISPLAY (gst_gl_display_egl_new_with_egl_display (display_ptr));
}
#endif
#if GST_GL_HAVE_PLATFORM_GLX
if (!self->gst_display)
{
GST_DEBUG_OBJECT (self, "got GLX on X11!");
platform = GST_GL_PLATFORM_GLX;
display_ptr = gdk_x11_display_get_xdisplay (display);
self->gst_display = GST_GL_DISPLAY (gst_gl_display_x11_new_with_display (display_ptr));
}
#endif
gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
gl_handle = gst_gl_context_get_current_gl_context (platform);
if (gl_handle)
{
self->gst_app_context = gst_gl_context_new_wrapped (self->gst_display, gl_handle, platform, gl_api);
}
else
{
GST_ERROR_OBJECT (self, "Failed to get handle from GdkGLContext");
return FALSE;
}
}
else
#endif
#ifdef HAVE_GST_WAYLAND_SUPPORT
if (GDK_IS_WAYLAND_DISPLAY (display))
{
platform = GST_GL_PLATFORM_EGL;
GST_DEBUG_OBJECT (self, "got EGL on Wayland!");
gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
gl_handle = gst_gl_context_get_current_gl_context (platform);
if (gl_handle)
{
struct wl_display *wayland_display;
wayland_display = gdk_wayland_display_get_wl_display (display);
self->gst_display = GST_GL_DISPLAY (gst_gl_display_wayland_new_with_display (wayland_display));
self->gst_app_context = gst_gl_context_new_wrapped (self->gst_display, gl_handle, platform, gl_api);
}
else
{
GST_ERROR_OBJECT (self, "Failed to get handle from GdkGLContext, not using Wayland EGL");
return FALSE;
}
}
else
#endif
#if GST_GL_HAVE_WINDOW_WIN32 && (GST_GL_HAVE_PLATFORM_WGL || GST_GL_HAVE_PLATFORM_EGL) && defined (GDK_WINDOWING_WIN32)
if (GDK_IS_WIN32_DISPLAY (display))
{
gboolean is_gles = check_win32_gst_gl_api (self->gdk_context, &platform, &gl_api);
const gchar *gl_type = is_gles ? "EGL" : "WGL";
GST_DEBUG_OBJECT (self, "got %s on Win32!", gl_type);
gl_handle = gst_gl_context_get_current_gl_context (platform);
if (gl_handle)
{
/*
* We must force a win32 GstGL display type and if using desktop GL, the GL_Platform to be WGL
* and an appropriate GstGL API depending on the gl_api we receive. We also ensure that we use
* an EGL GstGL API if we are using EGL in GDK. Envvars are required, unless
* gst_gl_display_new_with_type() is available, unfortunately, so that gst_gl_display_new() does
* things correctly if we have GstGL built with both EGL and WGL support for the WGL case,
* otherwise gst_gl_display_new() will assume an EGL display, which won't work for us
*/
if (gl_api & (GST_GL_API_OPENGL3 | GST_GL_API_OPENGL))
{
#ifdef HAVE_GST_GL_DISPLAY_NEW_WITH_TYPE
self->gst_display = gst_gl_display_new_with_type (GST_GL_DISPLAY_TYPE_WIN32);
#else
#if GST_GL_HAVE_PLATFORM_EGL
g_message ("If media fails to play, set the envvar `GST_DEBUG=1`, and if GstGL context creation fails");
g_message ("due to \"Couldn't create GL context: Cannot share context with non-EGL context\",");
g_message ("set in the environment `GST_GL_PLATFORM=wgl` and `GST_GL_WINDOW=win32`,");
g_message ("and restart the GTK application");
#endif
self->gst_display = gst_gl_display_new ();
#endif
}
#if GST_GL_HAVE_PLATFORM_EGL
else
{
gpointer display_ptr = gdk_win32_display_get_egl_display (display);
self->gst_display = GST_GL_DISPLAY (gst_gl_display_egl_new_with_egl_display (display_ptr));
}
#endif
gst_gl_display_filter_gl_api (self->gst_display, gl_api);
self->gst_app_context = gst_gl_context_new_wrapped (self->gst_display, gl_handle, platform, gl_api);
}
else
{
GST_ERROR_OBJECT (self, "Failed to get handle from GdkGLContext, not using %s", gl_type);
return FALSE;
}
}
else
#endif
{
GST_INFO_OBJECT (self, "Unsupported GDK display %s for GL", G_OBJECT_TYPE_NAME (display));
return FALSE;
}
g_assert (self->gst_app_context != NULL);
gst_gl_context_activate (self->gst_app_context, TRUE);
if (!gst_gl_context_fill_info (self->gst_app_context, &error))
{
GST_ERROR_OBJECT (self, "failed to retrieve GDK context info: %s", error->message);
g_clear_error (&error);
g_clear_object (&self->gst_app_context);
g_clear_object (&self->gst_display);
HANDLE_EXTERNAL_WGL_MAKE_CURRENT (self->gdk_context);
return FALSE;
}
else
{
DEACTIVATE_WGL_CONTEXT (self->gdk_context);
gst_gl_context_activate (self->gst_app_context, FALSE);
}
succeeded = gst_gl_display_create_context (self->gst_display, self->gst_app_context, &self->gst_context, &error);
if (!succeeded)
{
GST_ERROR_OBJECT (self, "Couldn't create GL context: %s", error->message);
g_error_free (error);
g_clear_object (&self->gst_app_context);
g_clear_object (&self->gst_display);
}
HANDLE_EXTERNAL_WGL_MAKE_CURRENT (self->gdk_context);
REACTIVATE_WGL_CONTEXT (self->gdk_context);
return succeeded;
}
static void
gtk_gst_sink_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkGstSink *self = GTK_GST_SINK (object);
switch (prop_id)
{
case PROP_PAINTABLE:
self->paintable = g_value_dup_object (value);
if (self->paintable == NULL)
self->paintable = GTK_GST_PAINTABLE (gtk_gst_paintable_new ());
break;
case PROP_GL_CONTEXT:
self->gdk_context = g_value_dup_object (value);
if (self->gdk_context != NULL && !gtk_gst_sink_initialize_gl (self))
g_clear_object (&self->gdk_context);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_gst_sink_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkGstSink *self = GTK_GST_SINK (object);
switch (prop_id)
{
case PROP_PAINTABLE:
g_value_set_object (value, self->paintable);
break;
case PROP_GL_CONTEXT:
g_value_set_object (value, self->gdk_context);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_gst_sink_dispose (GObject *object)
{
GtkGstSink *self = GTK_GST_SINK (object);
g_clear_object (&self->paintable);
g_clear_object (&self->gst_app_context);
g_clear_object (&self->gst_display);
g_clear_object (&self->gdk_context);
G_OBJECT_CLASS (gtk_gst_sink_parent_class)->dispose (object);
}
static void
gtk_gst_sink_class_init (GtkGstSinkClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GstBaseSinkClass *gstbasesink_class = GST_BASE_SINK_CLASS (klass);
GstVideoSinkClass *gstvideosink_class = GST_VIDEO_SINK_CLASS (klass);
gobject_class->set_property = gtk_gst_sink_set_property;
gobject_class->get_property = gtk_gst_sink_get_property;
gobject_class->dispose = gtk_gst_sink_dispose;
gstbasesink_class->set_caps = gtk_gst_sink_set_caps;
gstbasesink_class->get_times = gtk_gst_sink_get_times;
gstbasesink_class->query = gtk_gst_sink_query;
gstbasesink_class->propose_allocation = gtk_gst_sink_propose_allocation;
gstbasesink_class->get_caps = gtk_gst_sink_get_caps;
gstvideosink_class->show_frame = gtk_gst_sink_show_frame;
/**
* GtkGstSink:paintable:
*
* The paintable that provides the picture for this sink.
*/
properties[PROP_PAINTABLE] =
g_param_spec_object ("paintable",
P_("paintable"),
P_("Paintable providing the picture"),
GTK_TYPE_GST_PAINTABLE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
/**
* GtkGstSink:gl-context:
*
* The #GdkGLContext to use for GL rendering.
*/
properties[PROP_GL_CONTEXT] =
g_param_spec_object ("gl-context",
P_("gl-context"),
P_("GL context to use for rendering"),
GDK_TYPE_GL_CONTEXT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, N_PROPS, properties);
gst_element_class_set_metadata (gstelement_class,
"GtkMediaStream Video Sink",
"Sink/Video", "The video sink used by GtkMediaStream",
"Matthew Waters <matthew@centricular.com>, "
"Benjamin Otte <otte@gnome.org>");
gst_element_class_add_static_pad_template (gstelement_class,
&gtk_gst_sink_template);
}
static void
gtk_gst_sink_init (GtkGstSink * gtk_sink)
{
}
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