ext/vulkan/vkmemory.c - imx-gst-plugins-bad - Git at Google

 /*
  * GStreamer
  * Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
  *
  * 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.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <string.h>

 #include "vkmemory.h"

 /**
  * SECTION:vkmemory
  * @title: GstVkMemory
  * @short_description: memory subclass for Vulkan device memory
  * @see_also: #GstMemory, #GstAllocator
  *
  * GstVulkanMemory is a #GstMemory subclass providing support for the mapping of
  * Vulkan device memory.
  */

 /* WARNING: while suballocation is allowed, nothing prevents aliasing which
  * requires external synchronisation */

 #define GST_CAT_DEFUALT GST_CAT_VULKAN_MEMORY
 GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFUALT);

 static GstAllocator *_vulkan_memory_allocator;

 static gchar *
 _memory_properties_to_string (VkMemoryPropertyFlags prop_bits)
 {
   GString *s;
   gboolean first = TRUE;

 #define STR_APPEND(s,str) \
   G_STMT_START { \
     if (!first) \
       g_string_append (s, "|"); \
     g_string_append (s, str); \
     first = FALSE; \
   } G_STMT_END

   s = g_string_new (NULL);
   if (prop_bits & VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT) {
     STR_APPEND (s, "device-local");
   }
   if (prop_bits & VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT) {
     STR_APPEND (s, "host-visible");
     if (prop_bits & VK_MEMORY_PROPERTY_HOST_COHERENT_BIT) {
       STR_APPEND (s, "host-coherent");
     } else {
       STR_APPEND (s, "host-incoherent");
     }
     if (prop_bits & VK_MEMORY_PROPERTY_HOST_CACHED_BIT) {
       STR_APPEND (s, "host-cached");
     } else {
       STR_APPEND (s, "host-uncached");
     }
   }

   if (prop_bits & VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT) {
     STR_APPEND (s, "lazily-allocated");
   }

   return g_string_free (s, FALSE);
 }

 static void
 _vk_mem_init (GstVulkanMemory * mem, GstAllocator * allocator,
     GstMemory * parent, GstVulkanDevice * device, guint32 memory_type_index,
     GstAllocationParams * params, gsize size,
     VkMemoryPropertyFlags mem_prop_flags, gpointer user_data,
     GDestroyNotify notify)
 {
   gsize align = gst_memory_alignment, offset = 0, maxsize = size;
   GstMemoryFlags flags = 0;
   gchar *props_str;

   if (params) {
     flags = params->flags;
     align |= params->align;
     offset = params->prefix;
     maxsize += params->prefix + params->padding;
     if ((maxsize & align) != 0)
       maxsize += ~(maxsize & align) + 1;
   }

   gst_memory_init (GST_MEMORY_CAST (mem), flags, allocator, parent, maxsize,
       align, offset, size);

   mem->device = gst_object_ref (device);
   mem->alloc_info.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
   mem->alloc_info.pNext = NULL;
   mem->alloc_info.allocationSize = (VkDeviceSize) mem->mem.maxsize;
   mem->alloc_info.memoryTypeIndex = memory_type_index;
   mem->properties = mem_prop_flags;
   mem->notify = notify;
   mem->user_data = user_data;
   mem->vk_offset = 0;

   g_mutex_init (&mem->lock);

   props_str = _memory_properties_to_string (mem_prop_flags);

   GST_CAT_DEBUG (GST_CAT_VULKAN_MEMORY, "new Vulkan memory:%p size:%"
       G_GSIZE_FORMAT " properties:%s", mem, maxsize, props_str);

   g_free (props_str);
 }

 static GstVulkanMemory *
 _vk_mem_new (GstAllocator * allocator, GstMemory * parent,
     GstVulkanDevice * device, guint32 memory_type_index,
     GstAllocationParams * params, gsize size,
     VkMemoryPropertyFlags mem_props_flags, gpointer user_data,
     GDestroyNotify notify)
 {
   GstVulkanMemory *mem = g_new0 (GstVulkanMemory, 1);
   GError *error = NULL;
   VkResult err;

   _vk_mem_init (mem, allocator, parent, device, memory_type_index, params,
       size, mem_props_flags, user_data, notify);

   err =
       vkAllocateMemory (device->device, &mem->alloc_info, NULL, &mem->mem_ptr);
   if (gst_vulkan_error_to_g_error (err, &error, "vkAllocMemory") < 0) {
     GST_CAT_ERROR (GST_CAT_VULKAN_MEMORY, "Failed to allocate device memory %s",
         error->message);
     gst_memory_unref ((GstMemory *) mem);
     g_clear_error (&error);
     return NULL;
   }

   return mem;
 }

 static gpointer
 _vk_mem_map_full (GstVulkanMemory * mem, GstMapInfo * info, gsize size)
 {
   gpointer data;
   VkResult err;
   GError *error = NULL;

   if ((mem->properties & VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT) == 0) {
     GST_CAT_ERROR (GST_CAT_VULKAN_MEMORY, "Cannot map host-invisible memory");
     return NULL;
   }

   err = vkMapMemory (mem->device->device, mem->mem_ptr, mem->vk_offset,
       size, 0, &data);
   if (gst_vulkan_error_to_g_error (err, &error, "vkMapMemory") < 0) {
     GST_CAT_ERROR (GST_CAT_VULKAN_MEMORY, "Failed to map device memory %s",
         error->message);
     g_clear_error (&error);
     return NULL;
   }

   return data;
 }

 static void
 _vk_mem_unmap_full (GstVulkanMemory * mem, GstMapInfo * info)
 {
   vkUnmapMemory (mem->device->device, mem->mem_ptr);
 }

 static GstMemory *
 _vk_mem_copy (GstVulkanMemory * src, gssize offset, gssize size)
 {
   return NULL;
 }

 static GstMemory *
 _vk_mem_share (GstVulkanMemory * mem, gssize offset, gsize size)
 {
   GstVulkanMemory *shared = g_new0 (GstVulkanMemory, 1);
   GstVulkanMemory *parent = mem;
   GstAllocationParams params = { 0, };

   if (size == -1)
     size = mem->mem.size - offset;

   g_return_val_if_fail (size > 0, NULL);

   while ((parent = (GstVulkanMemory *) (GST_MEMORY_CAST (parent)->parent)));

   params.flags = GST_MEMORY_FLAGS (mem);
   params.align = GST_MEMORY_CAST (parent)->align;

   _vk_mem_init (shared, _vulkan_memory_allocator, GST_MEMORY_CAST (mem),
       parent->device, parent->alloc_info.memoryTypeIndex, &params, size,
       parent->properties, NULL, NULL);
   shared->mem_ptr = parent->mem_ptr;
   shared->wrapped = TRUE;
   shared->vk_offset = offset + mem->vk_offset;

   return GST_MEMORY_CAST (shared);
 }

 static gboolean
 _vk_mem_is_span (GstVulkanMemory * mem1, GstVulkanMemory * mem2, gsize * offset)
 {
   return FALSE;
 }

 static GstMemory *
 _vk_mem_alloc (GstAllocator * allocator, gsize size,
     GstAllocationParams * params)
 {
   g_critical ("Subclass should override GstAllocatorClass::alloc() function");

   return NULL;
 }

 static void
 _vk_mem_free (GstAllocator * allocator, GstMemory * memory)
 {
   GstVulkanMemory *mem = (GstVulkanMemory *) memory;

   GST_CAT_TRACE (GST_CAT_VULKAN_MEMORY, "freeing buffer memory:%p "
       "id:%" G_GUINT64_FORMAT, mem, (guint64) mem->mem_ptr);

   g_mutex_clear (&mem->lock);

   if (mem->notify)
     mem->notify (mem->user_data);

   if (mem->mem_ptr && !mem->wrapped)
     vkFreeMemory (mem->device->device, mem->mem_ptr, NULL);

   gst_object_unref (mem->device);
 }

 gboolean
 gst_vulkan_memory_find_memory_type_index_with_type_properties (GstVulkanDevice *
     device, guint32 typeBits, VkMemoryPropertyFlags properties,
     guint32 * typeIndex)
 {
   guint32 i;

   /* Search memtypes to find first index with those properties */
   for (i = 0; i < 32; i++) {
     if ((typeBits & 1) == 1) {
       /* Type is available, does it match user properties? */
       if ((device->memory_properties.memoryTypes[i].
               propertyFlags & properties) == properties) {
         *typeIndex = i;
         return TRUE;
       }
     }
     typeBits >>= 1;
   }

   return FALSE;
 }

 /**
  * gst_vulkan_memory_alloc:
  * @device:a #GstVulkanDevice
  * @memory_type_index: the Vulkan memory type index
  * @params: a #GstAllocationParams
  * @size: the size to allocate
  *
  * Allocated a new #GstVulkanMemory.
  *
  * Returns: a #GstMemory object backed by a vulkan device memory
  */
 GstMemory *
 gst_vulkan_memory_alloc (GstVulkanDevice * device, guint32 memory_type_index,
     GstAllocationParams * params, gsize size, VkMemoryPropertyFlags mem_flags)
 {
   GstVulkanMemory *mem;

   mem = _vk_mem_new (_vulkan_memory_allocator, NULL, device, memory_type_index,
       params, size, mem_flags, NULL, NULL);

   return (GstMemory *) mem;
 }

 G_DEFINE_TYPE (GstVulkanMemoryAllocator, gst_vulkan_memory_allocator,
     GST_TYPE_ALLOCATOR);

 static void
 gst_vulkan_memory_allocator_class_init (GstVulkanMemoryAllocatorClass * klass)
 {
   GstAllocatorClass *allocator_class = (GstAllocatorClass *) klass;

   allocator_class->alloc = _vk_mem_alloc;
   allocator_class->free = _vk_mem_free;
 }

 static void
 gst_vulkan_memory_allocator_init (GstVulkanMemoryAllocator * allocator)
 {
   GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);

   alloc->mem_type = GST_VULKAN_MEMORY_ALLOCATOR_NAME;
   alloc->mem_map_full = (GstMemoryMapFullFunction) _vk_mem_map_full;
   alloc->mem_unmap_full = (GstMemoryUnmapFullFunction) _vk_mem_unmap_full;
   alloc->mem_copy = (GstMemoryCopyFunction) _vk_mem_copy;
   alloc->mem_share = (GstMemoryShareFunction) _vk_mem_share;
   alloc->mem_is_span = (GstMemoryIsSpanFunction) _vk_mem_is_span;
 }

 /**
  * gst_vulkan_memory_init_once:
  *
  * Initializes the Vulkan memory allocator. It is safe to call this function
  * multiple times.  This must be called before any other #GstVulkanMemory operation.
  */
 void
 gst_vulkan_memory_init_once (void)
 {
   static volatile gsize _init = 0;

   if (g_once_init_enter (&_init)) {
     GST_DEBUG_CATEGORY_INIT (GST_CAT_VULKAN_MEMORY, "vulkanmemory", 0,
         "Vulkan Memory");

     _vulkan_memory_allocator =
         g_object_new (gst_vulkan_memory_allocator_get_type (), NULL);
     gst_object_ref_sink (_vulkan_memory_allocator);

     gst_allocator_register (GST_VULKAN_MEMORY_ALLOCATOR_NAME,
         gst_object_ref (_vulkan_memory_allocator));
     g_once_init_leave (&_init, 1);
   }
 }

 /**
  * gst_is_vulkan_memory:
  * @mem:a #GstMemory
  *
  * Returns: whether the memory at @mem is a #GstVulkanMemory
  */
 gboolean
 gst_is_vulkan_memory (GstMemory * mem)
 {
   return mem != NULL && mem->allocator != NULL &&
       g_type_is_a (G_OBJECT_TYPE (mem->allocator),
       GST_TYPE_VULKAN_MEMORY_ALLOCATOR);
 }
	/*
	* GStreamer
	* Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
	*
	* 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.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <string.h>

	#include "vkmemory.h"

	/**
	* SECTION:vkmemory
	* @title: GstVkMemory
	* @short_description: memory subclass for Vulkan device memory
	* @see_also: #GstMemory, #GstAllocator
	*
	* GstVulkanMemory is a #GstMemory subclass providing support for the mapping of
	* Vulkan device memory.
	*/

	/* WARNING: while suballocation is allowed, nothing prevents aliasing which
	* requires external synchronisation */

	#define GST_CAT_DEFUALT GST_CAT_VULKAN_MEMORY
	GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFUALT);

	static GstAllocator *_vulkan_memory_allocator;

	static gchar *
	_memory_properties_to_string (VkMemoryPropertyFlags prop_bits)
	{
	GString *s;
	gboolean first = TRUE;

	#define STR_APPEND(s,str) \
	G_STMT_START { \
	if (!first) \
	g_string_append (s, "\|"); \
	g_string_append (s, str); \
	first = FALSE; \
	} G_STMT_END

	s = g_string_new (NULL);
	if (prop_bits & VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT) {
	STR_APPEND (s, "device-local");
	}
	if (prop_bits & VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT) {
	STR_APPEND (s, "host-visible");
	if (prop_bits & VK_MEMORY_PROPERTY_HOST_COHERENT_BIT) {
	STR_APPEND (s, "host-coherent");
	} else {
	STR_APPEND (s, "host-incoherent");
	}
	if (prop_bits & VK_MEMORY_PROPERTY_HOST_CACHED_BIT) {
	STR_APPEND (s, "host-cached");
	} else {
	STR_APPEND (s, "host-uncached");
	}
	}

	if (prop_bits & VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT) {
	STR_APPEND (s, "lazily-allocated");
	}

	return g_string_free (s, FALSE);
	}

	static void
	_vk_mem_init (GstVulkanMemory * mem, GstAllocator * allocator,
	GstMemory * parent, GstVulkanDevice * device, guint32 memory_type_index,
	GstAllocationParams * params, gsize size,
	VkMemoryPropertyFlags mem_prop_flags, gpointer user_data,
	GDestroyNotify notify)
	{
	gsize align = gst_memory_alignment, offset = 0, maxsize = size;
	GstMemoryFlags flags = 0;
	gchar *props_str;

	if (params) {
	flags = params->flags;
	align \|= params->align;
	offset = params->prefix;
	maxsize += params->prefix + params->padding;
	if ((maxsize & align) != 0)
	maxsize += ~(maxsize & align) + 1;
	}

	gst_memory_init (GST_MEMORY_CAST (mem), flags, allocator, parent, maxsize,
	align, offset, size);

	mem->device = gst_object_ref (device);
	mem->alloc_info.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
	mem->alloc_info.pNext = NULL;
	mem->alloc_info.allocationSize = (VkDeviceSize) mem->mem.maxsize;
	mem->alloc_info.memoryTypeIndex = memory_type_index;
	mem->properties = mem_prop_flags;
	mem->notify = notify;
	mem->user_data = user_data;
	mem->vk_offset = 0;

	g_mutex_init (&mem->lock);

	props_str = _memory_properties_to_string (mem_prop_flags);

	GST_CAT_DEBUG (GST_CAT_VULKAN_MEMORY, "new Vulkan memory:%p size:%"
	G_GSIZE_FORMAT " properties:%s", mem, maxsize, props_str);

	g_free (props_str);
	}

	static GstVulkanMemory *
	_vk_mem_new (GstAllocator * allocator, GstMemory * parent,
	GstVulkanDevice * device, guint32 memory_type_index,
	GstAllocationParams * params, gsize size,
	VkMemoryPropertyFlags mem_props_flags, gpointer user_data,
	GDestroyNotify notify)
	{
	GstVulkanMemory *mem = g_new0 (GstVulkanMemory, 1);
	GError *error = NULL;
	VkResult err;

	_vk_mem_init (mem, allocator, parent, device, memory_type_index, params,
	size, mem_props_flags, user_data, notify);

	err =
	vkAllocateMemory (device->device, &mem->alloc_info, NULL, &mem->mem_ptr);
	if (gst_vulkan_error_to_g_error (err, &error, "vkAllocMemory") < 0) {
	GST_CAT_ERROR (GST_CAT_VULKAN_MEMORY, "Failed to allocate device memory %s",
	error->message);
	gst_memory_unref ((GstMemory *) mem);
	g_clear_error (&error);
	return NULL;
	}

	return mem;
	}

	static gpointer
	_vk_mem_map_full (GstVulkanMemory * mem, GstMapInfo * info, gsize size)
	{
	gpointer data;
	VkResult err;
	GError *error = NULL;

	if ((mem->properties & VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT) == 0) {
	GST_CAT_ERROR (GST_CAT_VULKAN_MEMORY, "Cannot map host-invisible memory");
	return NULL;
	}

	err = vkMapMemory (mem->device->device, mem->mem_ptr, mem->vk_offset,
	size, 0, &data);
	if (gst_vulkan_error_to_g_error (err, &error, "vkMapMemory") < 0) {
	GST_CAT_ERROR (GST_CAT_VULKAN_MEMORY, "Failed to map device memory %s",
	error->message);
	g_clear_error (&error);
	return NULL;
	}

	return data;
	}

	static void
	_vk_mem_unmap_full (GstVulkanMemory * mem, GstMapInfo * info)
	{
	vkUnmapMemory (mem->device->device, mem->mem_ptr);
	}

	static GstMemory *
	_vk_mem_copy (GstVulkanMemory * src, gssize offset, gssize size)
	{
	return NULL;
	}

	static GstMemory *
	_vk_mem_share (GstVulkanMemory * mem, gssize offset, gsize size)
	{
	GstVulkanMemory *shared = g_new0 (GstVulkanMemory, 1);
	GstVulkanMemory *parent = mem;
	GstAllocationParams params = { 0, };

	if (size == -1)
	size = mem->mem.size - offset;

	g_return_val_if_fail (size > 0, NULL);

	while ((parent = (GstVulkanMemory *) (GST_MEMORY_CAST (parent)->parent)));

	params.flags = GST_MEMORY_FLAGS (mem);
	params.align = GST_MEMORY_CAST (parent)->align;

	_vk_mem_init (shared, _vulkan_memory_allocator, GST_MEMORY_CAST (mem),
	parent->device, parent->alloc_info.memoryTypeIndex, &params, size,
	parent->properties, NULL, NULL);
	shared->mem_ptr = parent->mem_ptr;
	shared->wrapped = TRUE;
	shared->vk_offset = offset + mem->vk_offset;

	return GST_MEMORY_CAST (shared);
	}

	static gboolean
	_vk_mem_is_span (GstVulkanMemory * mem1, GstVulkanMemory * mem2, gsize * offset)
	{
	return FALSE;
	}

	static GstMemory *
	_vk_mem_alloc (GstAllocator * allocator, gsize size,
	GstAllocationParams * params)
	{
	g_critical ("Subclass should override GstAllocatorClass::alloc() function");

	return NULL;
	}

	static void
	_vk_mem_free (GstAllocator * allocator, GstMemory * memory)
	{
	GstVulkanMemory mem = (GstVulkanMemory ) memory;

	GST_CAT_TRACE (GST_CAT_VULKAN_MEMORY, "freeing buffer memory:%p "
	"id:%" G_GUINT64_FORMAT, mem, (guint64) mem->mem_ptr);

	g_mutex_clear (&mem->lock);

	if (mem->notify)
	mem->notify (mem->user_data);

	if (mem->mem_ptr && !mem->wrapped)
	vkFreeMemory (mem->device->device, mem->mem_ptr, NULL);

	gst_object_unref (mem->device);
	}

	gboolean
	gst_vulkan_memory_find_memory_type_index_with_type_properties (GstVulkanDevice *
	device, guint32 typeBits, VkMemoryPropertyFlags properties,
	guint32 * typeIndex)
	{
	guint32 i;

	/* Search memtypes to find first index with those properties */
	for (i = 0; i < 32; i++) {
	if ((typeBits & 1) == 1) {
	/* Type is available, does it match user properties? */
	if ((device->memory_properties.memoryTypes[i].
	propertyFlags & properties) == properties) {
	*typeIndex = i;
	return TRUE;
	}
	}
	typeBits >>= 1;
	}

	return FALSE;
	}

	/**
	* gst_vulkan_memory_alloc:
	* @device:a #GstVulkanDevice
	* @memory_type_index: the Vulkan memory type index
	* @params: a #GstAllocationParams
	* @size: the size to allocate
	*
	* Allocated a new #GstVulkanMemory.
	*
	* Returns: a #GstMemory object backed by a vulkan device memory
	*/
	GstMemory *
	gst_vulkan_memory_alloc (GstVulkanDevice * device, guint32 memory_type_index,
	GstAllocationParams * params, gsize size, VkMemoryPropertyFlags mem_flags)
	{
	GstVulkanMemory *mem;

	mem = _vk_mem_new (_vulkan_memory_allocator, NULL, device, memory_type_index,
	params, size, mem_flags, NULL, NULL);

	return (GstMemory *) mem;
	}

	G_DEFINE_TYPE (GstVulkanMemoryAllocator, gst_vulkan_memory_allocator,
	GST_TYPE_ALLOCATOR);

	static void
	gst_vulkan_memory_allocator_class_init (GstVulkanMemoryAllocatorClass * klass)
	{
	GstAllocatorClass allocator_class = (GstAllocatorClass ) klass;

	allocator_class->alloc = _vk_mem_alloc;
	allocator_class->free = _vk_mem_free;
	}

	static void
	gst_vulkan_memory_allocator_init (GstVulkanMemoryAllocator * allocator)
	{
	GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);

	alloc->mem_type = GST_VULKAN_MEMORY_ALLOCATOR_NAME;
	alloc->mem_map_full = (GstMemoryMapFullFunction) _vk_mem_map_full;
	alloc->mem_unmap_full = (GstMemoryUnmapFullFunction) _vk_mem_unmap_full;
	alloc->mem_copy = (GstMemoryCopyFunction) _vk_mem_copy;
	alloc->mem_share = (GstMemoryShareFunction) _vk_mem_share;
	alloc->mem_is_span = (GstMemoryIsSpanFunction) _vk_mem_is_span;
	}

	/**
	* gst_vulkan_memory_init_once:
	*
	* Initializes the Vulkan memory allocator. It is safe to call this function
	* multiple times. This must be called before any other #GstVulkanMemory operation.
	*/
	void
	gst_vulkan_memory_init_once (void)
	{
	static volatile gsize _init = 0;

	if (g_once_init_enter (&_init)) {
	GST_DEBUG_CATEGORY_INIT (GST_CAT_VULKAN_MEMORY, "vulkanmemory", 0,
	"Vulkan Memory");

	_vulkan_memory_allocator =
	g_object_new (gst_vulkan_memory_allocator_get_type (), NULL);
	gst_object_ref_sink (_vulkan_memory_allocator);

	gst_allocator_register (GST_VULKAN_MEMORY_ALLOCATOR_NAME,
	gst_object_ref (_vulkan_memory_allocator));
	g_once_init_leave (&_init, 1);
	}
	}

	/**
	* gst_is_vulkan_memory:
	* @mem:a #GstMemory
	*
	* Returns: whether the memory at @mem is a #GstVulkanMemory
	*/
	gboolean
	gst_is_vulkan_memory (GstMemory * mem)
	{
	return mem != NULL && mem->allocator != NULL &&
	g_type_is_a (G_OBJECT_TYPE (mem->allocator),
	GST_TYPE_VULKAN_MEMORY_ALLOCATOR);
	}