1 files changed, 159 insertions, 0 deletions
diff --git a/subprojects/gstreamer/tests/examples/memory/my-memory.c b/subprojects/gstreamer/tests/examples/memory/my-memory.c
new file mode 100644
index 0000000000..2c1b7cb097
--- /dev/null
+++ b/subprojects/gstreamer/tests/examples/memory/my-memory.c
@@ -0,0 +1,159 @@
+/* GStreamer
+ * Copyright (C) 2012 Wim Taymans <wim.taymans@gmail.be>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "my-memory.h"
+
+typedef struct
+{
+  GstMemory mem;
+
+  gpointer data;
+
+} MyMemory;
+
+
+static GstMemory *
+_my_alloc (GstAllocator * allocator, gsize size, GstAllocationParams * params)
+{
+  MyMemory *mem;
+  gsize maxsize = size + params->prefix + params->padding;
+
+  GST_DEBUG ("alloc from allocator %p", allocator);
+
+  mem = g_slice_new (MyMemory);
+
+  gst_memory_init (GST_MEMORY_CAST (mem), params->flags, allocator, NULL,
+      maxsize, params->align, params->prefix, size);
+
+  mem->data = NULL;
+
+  return (GstMemory *) mem;
+}
+
+static void
+_my_free (GstAllocator * allocator, GstMemory * mem)
+{
+  MyMemory *mmem = (MyMemory *) mem;
+
+  g_free (mmem->data);
+  g_slice_free (MyMemory, mmem);
+  GST_DEBUG ("%p: freed", mmem);
+}
+
+static gpointer
+_my_mem_map (MyMemory * mem, gsize maxsize, GstMapFlags flags)
+{
+  gpointer res;
+
+  while (TRUE) {
+    if ((res = g_atomic_pointer_get (&mem->data)) != NULL)
+      break;
+
+    res = g_malloc (maxsize);
+
+    if (g_atomic_pointer_compare_and_exchange (&mem->data, NULL, res))
+      break;
+
+    g_free (res);
+  }
+
+  GST_DEBUG ("%p: mapped %p", mem, res);
+
+  return res;
+}
+
+static gboolean
+_my_mem_unmap (MyMemory * mem)
+{
+  GST_DEBUG ("%p: unmapped", mem);
+  return TRUE;
+}
+
+static MyMemory *
+_my_mem_share (MyMemory * mem, gssize offset, gsize size)
+{
+  MyMemory *sub;
+  GstMemory *parent;
+
+  GST_DEBUG ("%p: share %" G_GSSIZE_FORMAT " %" G_GSIZE_FORMAT, mem, offset,
+      size);
+
+  /* find the real parent */
+  if ((parent = mem->mem.parent) == NULL)
+    parent = (GstMemory *) mem;
+
+  if (size == -1)
+    size = mem->mem.size - offset;
+
+  sub = g_slice_new (MyMemory);
+  /* the shared memory is always readonly */
+  gst_memory_init (GST_MEMORY_CAST (sub), GST_MINI_OBJECT_FLAGS (parent) |
+      GST_MINI_OBJECT_FLAG_LOCK_READONLY, mem->mem.allocator, parent,
+      mem->mem.maxsize, mem->mem.align, mem->mem.offset + offset, size);
+
+  /* install pointer */
+  sub->data = _my_mem_map (mem, mem->mem.maxsize, GST_MAP_READ);
+
+  return sub;
+}
+
+typedef struct
+{
+  GstAllocator parent;
+} MyMemoryAllocator;
+
+typedef struct
+{
+  GstAllocatorClass parent_class;
+} MyMemoryAllocatorClass;
+
+GType my_memory_allocator_get_type (void);
+G_DEFINE_TYPE (MyMemoryAllocator, my_memory_allocator, GST_TYPE_ALLOCATOR);
+
+static void
+my_memory_allocator_class_init (MyMemoryAllocatorClass * klass)
+{
+  GstAllocatorClass *allocator_class;
+
+  allocator_class = (GstAllocatorClass *) klass;
+
+  allocator_class->alloc = _my_alloc;
+  allocator_class->free = _my_free;
+}
+
+static void
+my_memory_allocator_init (MyMemoryAllocator * allocator)
+{
+  GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
+
+  alloc->mem_type = "MyMemory";
+  alloc->mem_map = (GstMemoryMapFunction) _my_mem_map;
+  alloc->mem_unmap = (GstMemoryUnmapFunction) _my_mem_unmap;
+  alloc->mem_share = (GstMemoryShareFunction) _my_mem_share;
+}
+
+void
+my_memory_init (void)
+{
+  GstAllocator *allocator;
+
+  allocator = g_object_new (my_memory_allocator_get_type (), NULL);
+
+  gst_allocator_register ("MyMemory", allocator);
+}