gboolean
gst_gl_handle_set_context (GstElement * element, GstContext * context,
GstGLDisplay ** display)
{
GstGLDisplay *replacement = NULL;
const gchar *context_type;
g_return_val_if_fail (display, FALSE);
if (!context)
return FALSE;
context_type = gst_context_get_context_type (context);
if (g_strcmp0 (context_type, GST_GL_DISPLAY_CONTEXT_TYPE) == 0) {
if (!gst_context_get_gl_display (context, &replacement)) {
GST_WARNING_OBJECT (element, "Failed to get display from context");
return FALSE;
}
}
if (replacement)
gst_object_replace ((GstObject **) display, (GstObject *) replacement);
return TRUE;
}
static void
gst_gl_display_context_prepare (GstElement * element,
GstGLDisplay ** display_ptr)
{
GstContext *ctxt;
GstQuery *query;
if (!GST_CAT_CONTEXT)
GST_DEBUG_CATEGORY_GET (GST_CAT_CONTEXT, "GST_CONTEXT");
/* 2a) Query downstream with GST_QUERY_CONTEXT for the context and
* check if downstream already has a context of the specific type
* 2b) Query upstream as above.
*/
ctxt = NULL;
query = gst_query_new_context (GST_GL_DISPLAY_CONTEXT_TYPE);
if (run_context_query (element, query, GST_PAD_SRC)) {
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"found context (%p) in downstream query", ctxt);
gst_query_parse_context (query, &ctxt);
} else if (run_context_query (element, query, GST_PAD_SINK)) {
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"found context (%p) in upstream query", ctxt);
gst_query_parse_context (query, &ctxt);
} else {
/* 3) Post a GST_MESSAGE_NEED_CONTEXT message on the bus with
* the required context type and afterwards check if a
* usable context was set now as in 1). The message could
* be handled by the parent bins of the element and the
* application.
*/
GstMessage *msg;
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"posting need context message");
msg = gst_message_new_need_context (GST_OBJECT_CAST (element),
GST_GL_DISPLAY_CONTEXT_TYPE);
gst_element_post_message (element, msg);
}
/*
* Whomever responds to the need-context message performs a
* GstElement::set_context() with the required context in which the element
* is required to update the display_ptr or call gst_gl_handle_set_context().
*/
if (ctxt) {
if (gst_context_has_context_type (ctxt, GST_GL_DISPLAY_CONTEXT_TYPE)) {
gst_context_get_gl_display (ctxt, display_ptr);
}
}
gst_query_unref (query);
}
static void
gst_gl_display_context_query (GstElement * element, GstGLDisplay ** display_ptr)
{
GstContext *ctxt;
GstQuery *query;
#ifndef GST_DISABLE_GST_DEBUG
if (!GST_CAT_CONTEXT)
GST_DEBUG_CATEGORY_GET (GST_CAT_CONTEXT, "GST_CONTEXT");
#endif
query =
_gst_context_query (element, display_ptr, GST_GL_DISPLAY_CONTEXT_TYPE);
gst_query_parse_context (query, &ctxt);
if (ctxt && gst_context_has_context_type (ctxt, GST_GL_DISPLAY_CONTEXT_TYPE))
gst_context_get_gl_display (ctxt, display_ptr);
if (*display_ptr)
goto out;
#if GST_GL_HAVE_WINDOW_X11
gst_query_unref (query);
query = _gst_context_query (element, display_ptr, "gst.x11.display.handle");
gst_query_parse_context (query, &ctxt);
if (ctxt && gst_context_has_context_type (ctxt, "gst.x11.display.handle")) {
const GstStructure *s;
Display *display;
s = gst_context_get_structure (ctxt);
if (gst_structure_get (s, "display", G_TYPE_POINTER, &display, NULL)
&& display) {
*display_ptr =
(GstGLDisplay *) gst_gl_display_x11_new_with_display (display);
}
}
if (*display_ptr)
goto out;
#endif
out:
gst_query_unref (query);
}
/**
* gst_gl_handle_set_context:
* @element: a #GstElement
* @context: a #GstContext
* @display: (inout) (transfer full): location of a #GstGLDisplay
* @other_context: (inout) (transfer full): location of a #GstGLContext
*
* Helper function for implementing GstElement::set_context() in OpenGL capable
* elements.
*
* Retrieve's the #GstGLDisplay or #GstGLContext in @context and places the
* result in @display or @other_context respectively.
*
* Returns: whether the @display or @other_context could be set successfully
*/
gboolean
gst_gl_handle_set_context (GstElement * element, GstContext * context,
GstGLDisplay ** display, GstGLContext ** other_context)
{
GstGLDisplay *display_replacement = NULL;
GstGLContext *context_replacement = NULL;
const gchar *context_type;
g_return_val_if_fail (display != NULL, FALSE);
g_return_val_if_fail (other_context != NULL, FALSE);
if (!context)
return FALSE;
context_type = gst_context_get_context_type (context);
if (g_strcmp0 (context_type, GST_GL_DISPLAY_CONTEXT_TYPE) == 0) {
if (!gst_context_get_gl_display (context, &display_replacement)) {
GST_WARNING_OBJECT (element, "Failed to get display from context");
return FALSE;
}
}
#if GST_GL_HAVE_WINDOW_X11
else if (g_strcmp0 (context_type, "gst.x11.display.handle") == 0) {
const GstStructure *s;
Display *display;
s = gst_context_get_structure (context);
if (gst_structure_get (s, "display", G_TYPE_POINTER, &display, NULL))
display_replacement =
(GstGLDisplay *) gst_gl_display_x11_new_with_display (display);
}
#endif
#if GST_GL_HAVE_WINDOW_WAYLAND
else if (g_strcmp0 (context_type, "GstWaylandDisplayHandleContextType") == 0) {
const GstStructure *s;
struct wl_display *display;
s = gst_context_get_structure (context);
if (gst_structure_get (s, "display", G_TYPE_POINTER, &display, NULL))
display_replacement =
(GstGLDisplay *) gst_gl_display_wayland_new_with_display (display);
}
#endif
else if (g_strcmp0 (context_type, "gst.gl.app_context") == 0) {
const GstStructure *s = gst_context_get_structure (context);
GstGLDisplay *context_display;
GstGLDisplay *element_display;
if (gst_structure_get (s, "context", GST_TYPE_GL_CONTEXT,
&context_replacement, NULL)) {
context_display = gst_gl_context_get_display (context_replacement);
element_display = display_replacement ? display_replacement : *display;
if (element_display
&& (gst_gl_display_get_handle_type (element_display) &
gst_gl_display_get_handle_type (context_display)) == 0) {
GST_ELEMENT_WARNING (element, LIBRARY, SETTINGS, ("%s",
"Cannot set a GL context with a different display type"), ("%s",
"Cannot set a GL context with a different display type"));
gst_object_unref (context_replacement);
context_replacement = NULL;
}
gst_object_unref (context_display);
}
}
if (display_replacement) {
GstGLDisplay *old = *display;
*display = display_replacement;
if (old)
gst_object_unref (old);
}
if (context_replacement) {
GstGLContext *old = *other_context;
*other_context = context_replacement;
if (old)
gst_object_unref (old);
}
return TRUE;
}
