vkqueue: add context helpers

ext/vulkan/vkqueue.c

@@ -26,10 +26,12 @@
 
 #define GST_CAT_DEFAULT gst_vulkan_queue_debug
 GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);
+GST_DEBUG_CATEGORY_STATIC (GST_CAT_CONTEXT);
 
 G_DEFINE_TYPE_WITH_CODE (GstVulkanQueue, gst_vulkan_queue, GST_TYPE_OBJECT,
     GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "vulkanqueue", 0,
-        "Vulkan Queue"));
+        "Vulkan Queue");
+    GST_DEBUG_CATEGORY_GET (GST_CAT_CONTEXT, "GST_CONTEXT"));
 
 static void gst_vulkan_queue_dispose (GObject * object);
 
@@ -63,3 +65,123 @@ gst_vulkan_queue_get_device (GstVulkanQueue * queue)
 
   return queue->device ? gst_object_ref (queue->device) : NULL;
 }
+
+/**
+ * gst_context_set_vulkan_queue:
+ * @context: a #GstContext
+ * @queue: a #GstVulkanQueue
+ *
+ * Sets @queue on @context
+ *
+ * Since: 1.10
+ */
+void
+gst_context_set_vulkan_queue (GstContext * context, GstVulkanQueue * queue)
+{
+  GstStructure *s;
+
+  g_return_if_fail (context != NULL);
+  g_return_if_fail (gst_context_is_writable (context));
+
+  if (queue)
+    GST_CAT_LOG (GST_CAT_CONTEXT,
+        "setting GstVulkanQueue(%" GST_PTR_FORMAT ") on context(%"
+        GST_PTR_FORMAT ")", queue, context);
+
+  s = gst_context_writable_structure (context);
+  gst_structure_set (s, GST_VULKAN_QUEUE_CONTEXT_TYPE_STR,
+      GST_TYPE_VULKAN_QUEUE, queue, NULL);
+}
+
+/**
+ * gst_context_get_vulkan_queue:
+ * @context: a #GstContext
+ * @queue: resulting #GstVulkanQueue
+ *
+ * Returns: Whether @queue was in @context
+ *
+ * Since: 1.10
+ */
+gboolean
+gst_context_get_vulkan_queue (GstContext * context, GstVulkanQueue ** queue)
+{
+  const GstStructure *s;
+  gboolean ret;
+
+  g_return_val_if_fail (queue != NULL, FALSE);
+  g_return_val_if_fail (context != NULL, FALSE);
+
+  s = gst_context_get_structure (context);
+  ret = gst_structure_get (s, GST_VULKAN_QUEUE_CONTEXT_TYPE_STR,
+      GST_TYPE_VULKAN_QUEUE, queue, NULL);
+
+  GST_CAT_LOG (GST_CAT_CONTEXT, "got GstVulkanQueue(%" GST_PTR_FORMAT
+      ") from context(%" GST_PTR_FORMAT ")", *queue, context);
+
+  return ret;
+}
+
+gboolean
+gst_vulkan_queue_handle_context_query (GstElement * element, GstQuery * query,
+    GstVulkanQueue ** queue)
+{
+  gboolean res = FALSE;
+  const gchar *context_type;
+  GstContext *context, *old_context;
+
+  g_return_val_if_fail (element != NULL, FALSE);
+  g_return_val_if_fail (query != NULL, FALSE);
+  g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT, FALSE);
+  g_return_val_if_fail (queue != NULL, FALSE);
+
+  gst_query_parse_context_type (query, &context_type);
+
+  if (g_strcmp0 (context_type, GST_VULKAN_QUEUE_CONTEXT_TYPE_STR) == 0) {
+    gst_query_parse_context (query, &old_context);
+
+    if (old_context)
+      context = gst_context_copy (old_context);
+    else
+      context = gst_context_new (GST_VULKAN_QUEUE_CONTEXT_TYPE_STR, TRUE);
+
+    gst_context_set_vulkan_queue (context, *queue);
+    gst_query_set_context (query, context);
+    gst_context_unref (context);
+
+    res = *queue != NULL;
+  }
+
+  return res;
+}
+
+gboolean
+gst_vulkan_queue_run_context_query (GstElement * element,
+    GstVulkanQueue ** queue)
+{
+  GstQuery *query;
+
+  g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+  g_return_val_if_fail (queue != NULL, FALSE);
+
+  if (*queue && GST_IS_VULKAN_QUEUE (*queue))
+    return TRUE;
+
+  if ((query =
+          gst_vulkan_local_context_query (element,
+              GST_VULKAN_QUEUE_CONTEXT_TYPE_STR, FALSE))) {
+    GstContext *context;
+
+    gst_query_parse_context (query, &context);
+    if (context)
+      gst_context_get_vulkan_queue (context, queue);
+  }
+
+  GST_DEBUG_OBJECT (element, "found queue %p", *queue);
+
+  gst_query_unref (query);
+
+  if (*queue)
+    return TRUE;
+
+  return FALSE;
+}

ext/vulkan/vkqueue.h

@@ -31,6 +31,8 @@
 #define GST_VULKAN_QUEUE_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS((o), GST_TYPE_VULKAN_QUEUE, GstVulkanQueueClass))
 GType gst_vulkan_queue_get_type       (void);
 
+#define GST_VULKAN_QUEUE_CONTEXT_TYPE_STR "gst.vulkan.queue"
+
 struct _GstVulkanQueue
 {
   GstObject parent;
@@ -49,4 +51,14 @@ struct _GstVulkanQueueClass
 
 GstVulkanDevice *   gst_vulkan_queue_get_device (GstVulkanQueue * queue);
 
+void                gst_context_set_vulkan_queue                (GstContext * context,
+                                                                 GstVulkanQueue * queue);
+gboolean            gst_context_get_vulkan_queue                (GstContext * context,
+                                                                 GstVulkanQueue ** queue);
+gboolean            gst_vulkan_queue_handle_context_query       (GstElement * element,
+                                                                 GstQuery * query,
+                                                                 GstVulkanQueue ** queue);
+gboolean            gst_vulkan_queue_run_context_query          (GstElement * element,
+                                                                 GstVulkanQueue ** queue);
+
 #endif /* _VK_QUEUE_H_ */