gtk/modules/media/gtkgstpaintable.c
Timm Bäder b74d3c2221 gtkgstpaintable: Handle a NULL value
gst_element_factory_make can return NULL.
2022-02-16 10:02:24 +01:00

315 lines
8.6 KiB
C

/*
* Copyright © 2018 Benjamin Otte
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gtkgstpaintableprivate.h"
#include "gtkgstsinkprivate.h"
#include <gtk/gtk.h>
#include <gst/player/gstplayer-video-renderer.h>
#include <math.h>
struct _GtkGstPaintable
{
GObject parent_instance;
GdkPaintable *image;
double pixel_aspect_ratio;
GdkGLContext *context;
};
struct _GtkGstPaintableClass
{
GObjectClass parent_class;
};
static void
gtk_gst_paintable_paintable_snapshot (GdkPaintable *paintable,
GdkSnapshot *snapshot,
double width,
double height)
{
GtkGstPaintable *self = GTK_GST_PAINTABLE (paintable);
if (self->image)
gdk_paintable_snapshot (self->image, snapshot, width, height);
}
static GdkPaintable *
gtk_gst_paintable_paintable_get_current_image (GdkPaintable *paintable)
{
GtkGstPaintable *self = GTK_GST_PAINTABLE (paintable);
if (self->image)
return GDK_PAINTABLE (g_object_ref (self->image));
return gdk_paintable_new_empty (0, 0);
}
static int
gtk_gst_paintable_paintable_get_intrinsic_width (GdkPaintable *paintable)
{
GtkGstPaintable *self = GTK_GST_PAINTABLE (paintable);
if (self->image)
return round (self->pixel_aspect_ratio *
gdk_paintable_get_intrinsic_width (self->image));
return 0;
}
static int
gtk_gst_paintable_paintable_get_intrinsic_height (GdkPaintable *paintable)
{
GtkGstPaintable *self = GTK_GST_PAINTABLE (paintable);
if (self->image)
return gdk_paintable_get_intrinsic_height (self->image);
return 0;
}
static double
gtk_gst_paintable_paintable_get_intrinsic_aspect_ratio (GdkPaintable *paintable)
{
GtkGstPaintable *self = GTK_GST_PAINTABLE (paintable);
if (self->image)
return self->pixel_aspect_ratio *
gdk_paintable_get_intrinsic_aspect_ratio (self->image);
return 0.0;
};
static void
gtk_gst_paintable_paintable_init (GdkPaintableInterface *iface)
{
iface->snapshot = gtk_gst_paintable_paintable_snapshot;
iface->get_current_image = gtk_gst_paintable_paintable_get_current_image;
iface->get_intrinsic_width = gtk_gst_paintable_paintable_get_intrinsic_width;
iface->get_intrinsic_height = gtk_gst_paintable_paintable_get_intrinsic_height;
iface->get_intrinsic_aspect_ratio = gtk_gst_paintable_paintable_get_intrinsic_aspect_ratio;
}
static GstElement *
gtk_gst_paintable_video_renderer_create_video_sink (GstPlayerVideoRenderer *renderer,
GstPlayer *player)
{
GtkGstPaintable *self = GTK_GST_PAINTABLE (renderer);
GstElement *sink;
GdkGLContext *ctx;
sink = g_object_new (GTK_TYPE_GST_SINK,
"paintable", self,
"gl-context", self->context,
NULL);
if (self->context != NULL)
g_object_get (GTK_GST_SINK (sink), "gl-context", &ctx, NULL);
if (self->context != NULL && ctx != NULL)
{
GstElement *glsinkbin = gst_element_factory_make ("glsinkbin", NULL);
if (!glsinkbin)
return NULL;
g_object_set (glsinkbin, "sink", sink, NULL);
g_object_unref (ctx);
return glsinkbin;
}
else
{
if (self->context != NULL)
{
g_warning ("GstGL context creation failed, falling back to non-GL playback");
g_object_unref (sink);
sink = g_object_new (GTK_TYPE_GST_SINK,
"paintable", self,
NULL);
}
return sink;
}
}
static void
gtk_gst_paintable_video_renderer_init (GstPlayerVideoRendererInterface *iface)
{
iface->create_video_sink = gtk_gst_paintable_video_renderer_create_video_sink;
}
G_DEFINE_TYPE_WITH_CODE (GtkGstPaintable, gtk_gst_paintable, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
gtk_gst_paintable_paintable_init)
G_IMPLEMENT_INTERFACE (GST_TYPE_PLAYER_VIDEO_RENDERER,
gtk_gst_paintable_video_renderer_init));
static void
gtk_gst_paintable_dispose (GObject *object)
{
GtkGstPaintable *self = GTK_GST_PAINTABLE (object);
g_clear_object (&self->image);
G_OBJECT_CLASS (gtk_gst_paintable_parent_class)->dispose (object);
}
static void
gtk_gst_paintable_class_init (GtkGstPaintableClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = gtk_gst_paintable_dispose;
}
static void
gtk_gst_paintable_init (GtkGstPaintable *self)
{
}
GdkPaintable *
gtk_gst_paintable_new (void)
{
return g_object_new (GTK_TYPE_GST_PAINTABLE, NULL);
}
void
gtk_gst_paintable_realize (GtkGstPaintable *self,
GdkSurface *surface)
{
GError *error = NULL;
if (self->context)
return;
self->context = gdk_surface_create_gl_context (surface, &error);
if (self->context == NULL)
{
GST_INFO ("failed to create GDK GL context: %s", error->message);
g_error_free (error);
return;
}
if (!gdk_gl_context_realize (self->context, &error))
{
GST_INFO ("failed to realize GDK GL context: %s", error->message);
g_clear_object (&self->context);
g_error_free (error);
return;
}
}
void
gtk_gst_paintable_unrealize (GtkGstPaintable *self,
GdkSurface *surface)
{
/* XXX: We could be smarter here and:
* - track how often we were realized with that surface
* - track alternate surfaces
*/
if (self->context == NULL)
return;
if (gdk_gl_context_get_surface (self->context) == surface)
g_clear_object (&self->context);
}
static void
gtk_gst_paintable_set_paintable (GtkGstPaintable *self,
GdkPaintable *paintable,
double pixel_aspect_ratio)
{
gboolean size_changed;
if (self->image == paintable)
return;
if (self->image == NULL ||
self->pixel_aspect_ratio * gdk_paintable_get_intrinsic_width (self->image) !=
pixel_aspect_ratio * gdk_paintable_get_intrinsic_width (paintable) ||
gdk_paintable_get_intrinsic_height (self->image) != gdk_paintable_get_intrinsic_height (paintable) ||
gdk_paintable_get_intrinsic_aspect_ratio (self->image) != gdk_paintable_get_intrinsic_aspect_ratio (paintable))
size_changed = TRUE;
else
size_changed = FALSE;
g_set_object (&self->image, paintable);
self->pixel_aspect_ratio = pixel_aspect_ratio;
if (size_changed)
gdk_paintable_invalidate_size (GDK_PAINTABLE (self));
gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
}
typedef struct _SetTextureInvocation SetTextureInvocation;
struct _SetTextureInvocation {
GtkGstPaintable *paintable;
GdkTexture *texture;
double pixel_aspect_ratio;
};
static void
set_texture_invocation_free (SetTextureInvocation *invoke)
{
g_object_unref (invoke->paintable);
g_object_unref (invoke->texture);
g_slice_free (SetTextureInvocation, invoke);
}
static gboolean
gtk_gst_paintable_set_texture_invoke (gpointer data)
{
SetTextureInvocation *invoke = data;
gtk_gst_paintable_set_paintable (invoke->paintable,
GDK_PAINTABLE (invoke->texture),
invoke->pixel_aspect_ratio);
return G_SOURCE_REMOVE;
}
void
gtk_gst_paintable_queue_set_texture (GtkGstPaintable *self,
GdkTexture *texture,
double pixel_aspect_ratio)
{
SetTextureInvocation *invoke;
invoke = g_slice_new0 (SetTextureInvocation);
invoke->paintable = g_object_ref (self);
invoke->texture = g_object_ref (texture);
invoke->pixel_aspect_ratio = pixel_aspect_ratio;
g_main_context_invoke_full (NULL,
G_PRIORITY_DEFAULT,
gtk_gst_paintable_set_texture_invoke,
invoke,
(GDestroyNotify) set_texture_invocation_free);
}