allocators: dmabuf: allow testing allocator type

In decide_allocation function some element may when to test the proposed allocator.
For example like this:
if (gst_query_get_n_allocation_params (query) > 0) {
	GstAllocator * allocator;
	GstAllocationParams params;
	gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
	if (g_strcmp0(allocator->mem_type, GST_ALLOCATOR_DMABUF) == 0)
		GST_DEBUG("got dmabuf allocator");
	else
		GST_DEBUG("got an other allocator");
}

https://bugzilla.gnome.org/show_bug.cgi?id=703659

diff --git a/gst-libs/gst/allocators/gstdmabuf.c b/gst-libs/gst/allocators/gstdmabuf.c
index 4a95f47..1c8abc4 100644 (file)
--- a/gst-libs/gst/allocators/gstdmabuf.c
+++ b/gst-libs/gst/allocators/gstdmabuf.c
@@ -56,8 +56,6 @@ typedef struct
   GMutex lock;
 } GstDmaBufMemory;
 
-#define ALLOCATOR_NAME "dmabuf"
-
 GST_DEBUG_CATEGORY_STATIC (dmabuf_debug);
 #define GST_CAT_DEFAULT dmabuf_debug
 
@@ -199,7 +197,7 @@ dmabuf_mem_allocator_init (GstDmaBufAllocator * allocator)
 {
   GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
 
-  alloc->mem_type = ALLOCATOR_NAME;
+  alloc->mem_type = GST_ALLOCATOR_DMABUF;
   alloc->mem_map = gst_dmabuf_mem_map;
   alloc->mem_unmap = gst_dmabuf_mem_unmap;
   alloc->mem_share = gst_dmabuf_mem_share;
@@ -213,7 +211,7 @@ gst_dmabuf_mem_init (void)
 {
   GstAllocator *allocator =
       g_object_new (dmabuf_mem_allocator_get_type (), NULL);
-  gst_allocator_register (ALLOCATOR_NAME, allocator);
+  gst_allocator_register (GST_ALLOCATOR_DMABUF, allocator);
 
   GST_DEBUG_CATEGORY_INIT (dmabuf_debug, "dmabuf", 0, "dmabuf memory");
 }
@@ -237,9 +235,9 @@ gst_dmabuf_allocator_obtain (void)
 
   g_once (&dmabuf_allocator_once, (GThreadFunc) gst_dmabuf_mem_init, NULL);
 
-  allocator = gst_allocator_find (ALLOCATOR_NAME);
+  allocator = gst_allocator_find (GST_ALLOCATOR_DMABUF);
   if (!allocator)
-    GST_WARNING ("No allocator named %s found", ALLOCATOR_NAME);
+    GST_WARNING ("No allocator named %s found", GST_ALLOCATOR_DMABUF);
   return allocator;
 }
 
@@ -319,9 +317,7 @@ gst_dmabuf_memory_get_fd (GstMemory * mem)
 gboolean
 gst_is_dmabuf_memory (GstMemory * mem)
 {
-  g_return_val_if_fail (mem != NULL, FALSE);
-
-  return g_strcmp0 (mem->allocator->mem_type, ALLOCATOR_NAME) == 0;
+  return gst_memory_is_type (mem, GST_ALLOCATOR_DMABUF);
 }
 
 #else /* !HAVE_MMAP */

diff --git a/gst-libs/gst/allocators/gstdmabuf.h b/gst-libs/gst/allocators/gstdmabuf.h
index 1db233c..a4eca2a 100644 (file)
--- a/gst-libs/gst/allocators/gstdmabuf.h
+++ b/gst-libs/gst/allocators/gstdmabuf.h
@@ -23,6 +23,10 @@
 
 #include <gst/gst.h>
 
+G_BEGIN_DECLS
+
+#define GST_ALLOCATOR_DMABUF "dmabuf"
+
 GstAllocator * gst_dmabuf_allocator_obtain (void);
 
 GstMemory    * gst_dmabuf_allocator_alloc (GstAllocator * allocator, gint fd, gsize size);
@@ -31,4 +35,5 @@ gint           gst_dmabuf_memory_get_fd (GstMemory * mem);
 
 gboolean       gst_is_dmabuf_memory (GstMemory * mem);
 
+G_END_DECLS
 #endif /* __GST_DMABUF_H__ */