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gldisplay: add gst_gl_display_create_context

Browse source 
It also emits a create-context signal so that an application
can provide an external GstGLContext backend.

https://bugzilla.gnome.org/show_bug.cgi?id=750310
This commit is contained in:
Julien Isorce 2015-06-15 16:09:54 +01:00
parent b0995fcca0
commit 66d833fcf2
3 changed files with 112 additions and 35 deletions
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68
ext/gl/gstglimagesink.c
View file

@ -696,22 +696,37 @@ _ensure_gl_setup (GstGLImageSink * gl_sink)
if (!gl_sink->context) {
GST_OBJECT_LOCK (gl_sink->display);
do {
GstGLContext *other_context;
GstGLWindow *window;
GstGLContext *other_context = NULL;
GstGLWindow *window = NULL;
if (gl_sink->context)
if (gl_sink->context) {
gst_object_unref (gl_sink->context);
gl_sink->context = NULL;
}
GST_DEBUG_OBJECT (gl_sink,
"No current context, creating one for %" GST_PTR_FORMAT,
gl_sink->display);
gl_sink->context = gst_gl_context_new (gl_sink->display);
if (!gl_sink->context) {
GST_OBJECT_UNLOCK (gl_sink->display);
goto context_creation_error;
if (gl_sink->other_context) {
other_context = gst_object_ref (gl_sink->other_context);
} else {
other_context =
gst_gl_display_get_gl_context_for_thread (gl_sink->display, NULL);
}
if (!gst_gl_display_create_context (gl_sink->display,
other_context, &gl_sink->context, &error)) {
if (other_context)
gst_object_unref (other_context);
GST_OBJECT_UNLOCK (gl_sink->display);
goto context_error;
}
GST_DEBUG_OBJECT (gl_sink,
"created context %" GST_PTR_FORMAT " from other context %"
GST_PTR_FORMAT, gl_sink->context, gl_sink->other_context);
window = gst_gl_context_get_window (gl_sink->context);
GST_DEBUG_OBJECT (gl_sink, "got window %" GST_PTR_FORMAT, window);
@ -729,25 +744,6 @@ _ensure_gl_setup (GstGLImageSink * gl_sink)
gst_gl_window_set_window_handle (window, gl_sink->window_id);
}
if (gl_sink->other_context) {
other_context = gst_object_ref (gl_sink->other_context);
} else {
other_context =
gst_gl_display_get_gl_context_for_thread (gl_sink->display, NULL);
}
GST_DEBUG_OBJECT (gl_sink,
"creating context %" GST_PTR_FORMAT " from other context %"
GST_PTR_FORMAT, gl_sink->context, other_context);
if (!gst_gl_context_create (gl_sink->context, other_context, &error)) {
if (other_context)
gst_object_unref (other_context);
gst_object_unref (window);
GST_OBJECT_UNLOCK (gl_sink->display);
goto context_error;
}
gst_gl_window_handle_events (window, gl_sink->handle_events);
/* setup callbacks */
@ -782,19 +778,21 @@ _ensure_gl_setup (GstGLImageSink * gl_sink)
return TRUE;
context_creation_error:
{
GST_ELEMENT_ERROR (gl_sink, RESOURCE, NOT_FOUND,
("Failed to create GL context"), (NULL));
return FALSE;
}
context_error:
{
GST_ELEMENT_ERROR (gl_sink, RESOURCE, NOT_FOUND, ("%s", error->message),
(NULL));
gst_object_unref (gl_sink->context);
gl_sink->context = NULL;
if (gl_sink->context) {
gst_object_unref (gl_sink->context);
gl_sink->context = NULL;
}
if (error) {
g_error_free (error);
error = NULL;
}
return FALSE;
}
}

77
gst-libs/gst/gl/gstgldisplay.c
View file

@ -84,6 +84,15 @@ G_DEFINE_TYPE_WITH_CODE (GstGLDisplay, gst_gl_display, GST_TYPE_OBJECT,
#define GST_GL_DISPLAY_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE((o), GST_TYPE_GL_DISPLAY, GstGLDisplayPrivate))
enum
{
SIGNAL_0,
CREATE_CONTEXT,
LAST_SIGNAL
};
static guint gst_gl_display_signals[LAST_SIGNAL] = { 0 };
static void gst_gl_display_finalize (GObject * object);
static guintptr gst_gl_display_default_get_handle (GstGLDisplay * display);
@ -99,6 +108,22 @@ gst_gl_display_class_init (GstGLDisplayClass * klass)
{
g_type_class_add_private (klass, sizeof (GstGLDisplayPrivate));
/**
* GstGLDisplay::create-context:
* @object: the #GstGLDisplay
* @context: other context to share resources with.
*
* Overrides the @GstGLContext creation mechanism.
* It can be called in any thread and it is emitted with
* display's object lock held.
*
* Returns: the new context.
*/
gst_gl_display_signals[CREATE_CONTEXT] =
g_signal_new ("create-context", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,
GST_GL_TYPE_CONTEXT, 1, GST_GL_TYPE_CONTEXT);
klass->get_handle = gst_gl_display_default_get_handle;
G_OBJECT_CLASS (klass)->finalize = gst_gl_display_finalize;
@ -341,6 +366,58 @@ gst_context_get_gl_display (GstContext * context, GstGLDisplay ** display)
return ret;
}
/**
* gst_gl_display_create_context:
* @display: a #GstGLDisplay
* @other_context: other #GstGLContext to share resources with.
* @p_context: resulting #GstGLContext
* @error: resulting #GError
*
* It requires the display's object lock to be held.
*
* Returns: whether a new context could be created.
*
* Since: 1.6
*/
gboolean
gst_gl_display_create_context (GstGLDisplay * display,
GstGLContext * other_context, GstGLContext ** p_context, GError ** error)
{
GstGLContext *context = NULL;
gboolean ret = FALSE;
g_return_val_if_fail (display != NULL, FALSE);
g_return_val_if_fail (p_context != NULL, FALSE);
g_return_val_if_fail (error != NULL, FALSE);
g_return_val_if_fail (*error == NULL, FALSE);
g_signal_emit (display, gst_gl_display_signals[CREATE_CONTEXT], 0,
other_context, &context);
if (context) {
*p_context = context;
return TRUE;
}
context = gst_gl_context_new (display);
if (!context) {
g_set_error (error, GST_GL_CONTEXT_ERROR, GST_GL_CONTEXT_ERROR_FAILED,
"Failed to create GL context");
return FALSE;
}
GST_DEBUG_OBJECT (display,
"creating context %" GST_PTR_FORMAT " from other context %"
GST_PTR_FORMAT, context, other_context);
ret = gst_gl_context_create (context, other_context, error);
if (ret)
*p_context = context;
return ret;
}
static GstGLContext *
_get_gl_context_for_thread_unlocked (GstGLDisplay * display, GThread * thread)
{

2
gst-libs/gst/gl/gstgldisplay.h
View file

@ -92,6 +92,8 @@ GstGLAPI gst_gl_display_get_gl_api_unlocked (GstGLDisplay * display);
void gst_context_set_gl_display (GstContext * context, GstGLDisplay * display);
gboolean gst_context_get_gl_display (GstContext * context, GstGLDisplay ** display);
gboolean gst_gl_display_create_context (GstGLDisplay * display,
GstGLContext * other_context, GstGLContext ** p_context, GError **error);
GstGLContext * gst_gl_display_get_gl_context_for_thread (GstGLDisplay * display,
GThread * thread);
gboolean gst_gl_display_add_context (GstGLDisplay * display,