gstreamer/subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkimagebufferpool.c

/*
 * GStreamer
 * Copyright (C) 2016 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 "gstvkimagebufferpool.h"

/**
 * SECTION:vkimagebufferpool
 * @title: GstVulkanImageBufferPool
 * @short_description: buffer pool for #GstVulkanImageMemory objects
 * @see_also: #GstBufferPool, #GstVulkanImageMemory
 *
 * a #GstVulkanImageBufferPool is an object that allocates buffers with #GstVulkanImageMemory
 *
 * A #GstVulkanImageBufferPool is created with gst_vulkan_image_buffer_pool_new()
 */

/* bufferpool */
struct _GstVulkanImageBufferPoolPrivate
{
  GstCaps *caps;
  gboolean raw_caps;
  GstVideoInfo v_info;
  VkImageUsageFlags usage;
  VkMemoryPropertyFlags mem_props;
  VkFormat vk_fmts[GST_VIDEO_MAX_PLANES];
  int n_imgs;
  GstVulkanCommandPool *cmd_pool;
  GstVulkanTrashList *trash_list;
  gboolean has_sync2;
  gboolean has_profile;
  GstVulkanVideoProfile profile;
};

static void gst_vulkan_image_buffer_pool_finalize (GObject * object);

GST_DEBUG_CATEGORY_STATIC (GST_CAT_VULKAN_IMAGE_BUFFER_POOL);
#define GST_CAT_DEFAULT GST_CAT_VULKAN_IMAGE_BUFFER_POOL

#define GET_PRIV(pool) gst_vulkan_image_buffer_pool_get_instance_private (pool)

#define gst_vulkan_image_buffer_pool_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstVulkanImageBufferPool, gst_vulkan_image_buffer_pool,
    GST_TYPE_BUFFER_POOL, G_ADD_PRIVATE (GstVulkanImageBufferPool)
    GST_DEBUG_CATEGORY_INIT (GST_CAT_VULKAN_IMAGE_BUFFER_POOL,
        "vulkanimagebufferpool", 0, "Vulkan Image Buffer Pool"));

/**
 * gst_vulkan_image_buffer_pool_config_set_allocation_params:
 * @config: the #GstStructure with the pool's configuration.
 * @usage: The Vulkan image usage flags.
 * @mem_properties: Vulkan memory property flags.
 *
 * Sets the @usage and @mem_properties of the images to setup.
 *
 * Since: 1.24
 */
void
gst_vulkan_image_buffer_pool_config_set_allocation_params (GstStructure *
    config, VkImageUsageFlags usage, VkMemoryPropertyFlags mem_properties)
{
  /* assumption: G_TYPE_UINT is compatible with uint32_t (VkFlags) */
  gst_structure_set (config, "usage", G_TYPE_UINT, usage, "memory-properties",
      G_TYPE_UINT, mem_properties, NULL);
}

/**
 * gst_vulkan_image_buffer_pool_config_set_decode_caps:
 * @config: the #GstStructure with the pool's configuration.
 * @caps: Upstream decode caps.
 *
 * Decode @caps are used when the buffers are going to be used either as decoded
 * dest or DPB images.
 *
 * Since: 1.24
 */
void
gst_vulkan_image_buffer_pool_config_set_decode_caps (GstStructure * config,
    GstCaps * caps)
{
  g_return_if_fail (GST_IS_CAPS (caps));

  gst_structure_set (config, "decode-caps", GST_TYPE_CAPS, caps, NULL);
}

static inline gboolean
gst_vulkan_image_buffer_pool_config_get_allocation_params (GstStructure *
    config, VkImageUsageFlags * usage, VkMemoryPropertyFlags * mem_props,
    GstCaps ** decode_caps)
{
  if (!gst_structure_get_uint (config, "usage", usage)) {
    *usage = VK_IMAGE_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT
        | VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_SAMPLED_BIT
        | VK_IMAGE_USAGE_INPUT_ATTACHMENT_BIT;
  }

  if (!gst_structure_get_uint (config, "memory-properties", mem_props))
    *mem_props = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;

  if (decode_caps)
    gst_structure_get (config, "decode-caps", GST_TYPE_CAPS, decode_caps, NULL);

  return TRUE;
}

static gboolean
gst_vulkan_image_buffer_pool_set_config (GstBufferPool * pool,
    GstStructure * config)
{
  GstVulkanImageBufferPool *vk_pool = GST_VULKAN_IMAGE_BUFFER_POOL_CAST (pool);
  GstVulkanImageBufferPoolPrivate *priv = GET_PRIV (vk_pool);
  VkImageTiling tiling;
  VkImageUsageFlags supported_usage;
  VkImageCreateInfo image_info;
  guint min_buffers, max_buffers;
  GstCaps *caps = NULL, *decode_caps = NULL;
  GstCapsFeatures *features;
  gboolean found, no_multiplane = FALSE, ret = TRUE;
  guint i;

  if (!gst_buffer_pool_config_get_params (config, &caps, NULL, &min_buffers,
          &max_buffers))
    goto wrong_config;

  if (caps == NULL)
    goto no_caps;

  /* now parse the caps from the config */
  if (!gst_video_info_from_caps (&priv->v_info, caps))
    goto wrong_caps;

  GST_LOG_OBJECT (pool, "%dx%d, caps %" GST_PTR_FORMAT, priv->v_info.width,
      priv->v_info.height, caps);

  gst_caps_replace (&priv->caps, caps);

  features = gst_caps_get_features (caps, 0);
  priv->raw_caps = features == NULL || gst_caps_features_is_equal (features,
      GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY);

  gst_vulkan_image_buffer_pool_config_get_allocation_params (config,
      &priv->usage, &priv->mem_props, &decode_caps);

  priv->has_profile = FALSE;
#if GST_VULKAN_HAVE_VIDEO_EXTENSIONS
  if (decode_caps && ((priv->usage
              & (VK_IMAGE_USAGE_VIDEO_DECODE_DST_BIT_KHR
                  | VK_IMAGE_USAGE_VIDEO_DECODE_DPB_BIT_KHR)) != 0)) {
    priv->has_profile =
        gst_vulkan_video_profile_from_caps (&priv->profile, decode_caps);
  }
#endif
  gst_clear_caps (&decode_caps);

#if GST_VULKAN_HAVE_VIDEO_EXTENSIONS
  if (((priv->usage & (VK_IMAGE_USAGE_VIDEO_DECODE_DST_BIT_KHR
                  | VK_IMAGE_USAGE_VIDEO_DECODE_DPB_BIT_KHR)) != 0)
      && !priv->has_profile)
    goto missing_profile;

  no_multiplane = !priv->has_profile;
#endif

  tiling = priv->raw_caps ? VK_IMAGE_TILING_LINEAR : VK_IMAGE_TILING_OPTIMAL;
  found = gst_vulkan_format_from_video_info_2 (vk_pool->device->physical_device,
      &priv->v_info, tiling, no_multiplane, priv->vk_fmts, &priv->n_imgs,
      &supported_usage);
  if (!found)
    goto no_vk_format;

  if (priv->usage == 0) {
    priv->usage = supported_usage & (VK_BUFFER_USAGE_TRANSFER_DST_BIT
        | VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_STORAGE_BIT
        | VK_IMAGE_USAGE_SAMPLED_BIT);
  }

  /* get the size of the buffer to allocate */
  /* *INDENT-OFF* */
  image_info = (VkImageCreateInfo) {
    .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
    .pNext = NULL,
    .flags = 0,
    .imageType = VK_IMAGE_TYPE_2D,
    /* .format = fill per image,  */
    /* .extent = fill per plane, */
    .mipLevels = 1,
    .arrayLayers = 1,
    .samples = VK_SAMPLE_COUNT_1_BIT,
    .tiling = tiling,
    .usage = priv->usage,
    .sharingMode = VK_SHARING_MODE_EXCLUSIVE,
    .queueFamilyIndexCount = 0,
    .pQueueFamilyIndices = NULL,
    .initialLayout = VK_IMAGE_LAYOUT_UNDEFINED,
  };
  /* *INDENT-ON* */
  priv->v_info.size = 0;
  for (i = 0; i < priv->n_imgs; i++) {
    GstVulkanImageMemory *img_mem;
    guint width, height;
#if GST_VULKAN_HAVE_VIDEO_EXTENSIONS
    VkVideoProfileListInfoKHR profile_list = {
      .sType = VK_STRUCTURE_TYPE_VIDEO_PROFILE_LIST_INFO_KHR,
      .profileCount = 1,
      .pProfiles = &priv->profile.profile,
    };
#endif

    if (GST_VIDEO_INFO_N_PLANES (&priv->v_info) != priv->n_imgs) {
      width = GST_VIDEO_INFO_WIDTH (&priv->v_info);
      height = GST_VIDEO_INFO_HEIGHT (&priv->v_info);
    } else {
      width = GST_VIDEO_INFO_COMP_WIDTH (&priv->v_info, i);
      height = GST_VIDEO_INFO_COMP_HEIGHT (&priv->v_info, i);
    }

    image_info.format = priv->vk_fmts[i];
    /* *INDENT-OFF* */
    image_info.extent = (VkExtent3D) { width, height, 1 };
    /* *INDENT-ON* */
#if GST_VULKAN_HAVE_VIDEO_EXTENSIONS
    if (priv->has_profile)
      image_info.pNext = &profile_list;
#endif

    img_mem = (GstVulkanImageMemory *)
        gst_vulkan_image_memory_alloc_with_image_info (vk_pool->device,
        &image_info, priv->mem_props);
    if (!img_mem)
      goto mem_create_failed;

    if (!img_mem)
      goto image_failed;

    priv->v_info.offset[i] = priv->v_info.size;
    priv->v_info.size += img_mem->requirements.size;

    gst_memory_unref (GST_MEMORY_CAST (img_mem));
  }

  gst_buffer_pool_config_set_params (config, caps,
      priv->v_info.size, min_buffers, max_buffers);

  return GST_BUFFER_POOL_CLASS (parent_class)->set_config (pool, config) && ret;

  /* ERRORS */
wrong_config:
  {
    GST_WARNING_OBJECT (pool, "invalid config");
    return FALSE;
  }
no_caps:
  {
    GST_WARNING_OBJECT (pool, "no caps in config");
    return FALSE;
  }
wrong_caps:
  {
    GST_WARNING_OBJECT (pool,
        "failed getting geometry from caps %" GST_PTR_FORMAT, caps);
    return FALSE;
  }
no_vk_format:
  {
    GST_WARNING_OBJECT (pool, "no Vulkan format available for %s",
        gst_video_format_to_string (GST_VIDEO_INFO_FORMAT (&priv->v_info)));
    return FALSE;
  }
mem_create_failed:
  {
    GST_WARNING_OBJECT (pool, "Could not create Vulkan Memory");
    return FALSE;
  }
#if GST_VULKAN_HAVE_VIDEO_EXTENSIONS
missing_profile:
  {
    GST_WARNING_OBJECT (pool, "missing or invalid decode-caps");
    return FALSE;
  }
#endif
image_failed:
  {
    GST_WARNING_OBJECT (pool, "Failed to allocate image");
    return FALSE;
  }
}

struct choose_data
{
  GstVulkanQueue *queue;
};

#if (defined(VK_VERSION_1_4) || (defined(VK_VERSION_1_3) && VK_HEADER_VERSION >= 204))
static gboolean
_choose_queue (GstVulkanDevice * device, GstVulkanQueue * queue,
    gpointer user_data)
{
  struct choose_data *data = user_data;
  guint flags =
      device->physical_device->queue_family_props[queue->family].queueFlags;

  if ((flags & (VK_QUEUE_GRAPHICS_BIT | VK_QUEUE_COMPUTE_BIT)) != 0) {
    data->queue = gst_object_ref (queue);
    return FALSE;
  }

  return TRUE;
}
#endif

static gboolean
prepare_buffer (GstVulkanImageBufferPool * vk_pool, GstBuffer * buffer)
{
#if (defined(VK_VERSION_1_4) || (defined(VK_VERSION_1_3) && VK_HEADER_VERSION >= 204))
  GstVulkanImageBufferPoolPrivate *priv = GET_PRIV (vk_pool);
  GstVulkanCommandBuffer *cmd_buf = NULL;
  VkImageMemoryBarrier2 image_memory_barrier[GST_VIDEO_MAX_PLANES];
  VkImageLayout new_layout;
  VkAccessFlags2 new_access;
  guint i, n_mems;
  GError *error = NULL;
  VkResult err;

  if (!priv->has_sync2)
    return TRUE;

  if (!priv->cmd_pool) {
    struct choose_data data = { NULL };

    priv->trash_list = gst_vulkan_trash_fence_list_new ();

    gst_vulkan_device_foreach_queue (vk_pool->device, _choose_queue, &data);
    if (!data.queue)
      return FALSE;
    priv->cmd_pool = gst_vulkan_queue_create_command_pool (data.queue, &error);
    gst_object_unref (data.queue);
    if (error)
      goto error;
  }

  if (!(cmd_buf = gst_vulkan_command_pool_create (priv->cmd_pool, &error)))
    goto error;

  {
    /* *INDENT-OFF* */
    VkCommandBufferBeginInfo cmd_buf_info = {
        .sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO,
        .pNext = NULL,
        .flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT,
        .pInheritanceInfo = NULL
    };
    /* *INDENT-ON* */

    gst_vulkan_command_buffer_lock (cmd_buf);
    err = vkBeginCommandBuffer (cmd_buf->cmd, &cmd_buf_info);
    if (gst_vulkan_error_to_g_error (err, &error, "vkBeginCommandBuffer") < 0)
      goto unlock_error;
  }

#if GST_VULKAN_HAVE_VIDEO_EXTENSIONS
  if ((priv->usage & VK_IMAGE_USAGE_VIDEO_DECODE_DPB_BIT_KHR) != 0 &&
      (priv->usage & VK_IMAGE_USAGE_VIDEO_DECODE_DST_BIT_KHR) == 0) {
    new_layout = VK_IMAGE_LAYOUT_VIDEO_DECODE_DPB_KHR;
    new_access = VK_ACCESS_TRANSFER_READ_BIT | VK_ACCESS_TRANSFER_WRITE_BIT;
  } else if ((priv->usage & VK_IMAGE_USAGE_VIDEO_DECODE_DST_BIT_KHR) != 0) {
    new_layout = VK_IMAGE_LAYOUT_VIDEO_DECODE_DST_KHR;
    new_access = VK_ACCESS_TRANSFER_WRITE_BIT;
#ifdef VK_ENABLE_BETA_EXTENSIONS
  } else if ((priv->usage & VK_IMAGE_USAGE_VIDEO_ENCODE_DPB_BIT_KHR) != 0) {
    new_layout = VK_IMAGE_LAYOUT_VIDEO_ENCODE_DPB_KHR;
    new_access = VK_ACCESS_TRANSFER_READ_BIT | VK_ACCESS_TRANSFER_WRITE_BIT;
#endif
  } else
#endif
  {
    new_layout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
    new_access = VK_ACCESS_TRANSFER_WRITE_BIT;
  }

  n_mems = gst_buffer_n_memory (buffer);
  for (i = 0; i < n_mems; i++) {
    GstMemory *in_mem;
    GstVulkanImageMemory *img_mem;

    in_mem = gst_buffer_peek_memory (buffer, i);
    img_mem = (GstVulkanImageMemory *) in_mem;

    /* *INDENT-OFF* */
    image_memory_barrier[i] = (VkImageMemoryBarrier2) {
        .sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER_2,
        .pNext = NULL,
        .srcStageMask = VK_PIPELINE_STAGE_2_NONE,
        .dstStageMask = VK_PIPELINE_STAGE_2_ALL_COMMANDS_BIT,
        .srcAccessMask = img_mem->barrier.parent.access_flags,
        .dstAccessMask = new_access,
        .oldLayout = img_mem->barrier.image_layout,
        .newLayout = new_layout,
        /* FIXME: implement exclusive transfers */
        .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
        .dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
        .image = img_mem->image,
        .subresourceRange = img_mem->barrier.subresource_range
    };
    /* *INDENT-ON* */

    img_mem->barrier.parent.pipeline_stages =
        image_memory_barrier[i].dstStageMask;
    img_mem->barrier.parent.access_flags =
        image_memory_barrier[i].dstAccessMask;
    img_mem->barrier.image_layout = image_memory_barrier[i].newLayout;
  }

  if (i > 0) {
    /* *INDENT-OFF* */
    vkCmdPipelineBarrier2 (cmd_buf->cmd, &(VkDependencyInfo) {
        .sType = VK_STRUCTURE_TYPE_DEPENDENCY_INFO,
        .pImageMemoryBarriers = image_memory_barrier,
        .imageMemoryBarrierCount = i,
      });
    /* *INDENT-ON* */
  }

  err = vkEndCommandBuffer (cmd_buf->cmd);
  gst_vulkan_command_buffer_unlock (cmd_buf);
  if (gst_vulkan_error_to_g_error (err, &error, "vkEndCommandBuffer") < 0)
    goto error;

  {
    GstVulkanFence *fence;
    VkCommandBufferSubmitInfo cmd_buf_info = (VkCommandBufferSubmitInfo) {
      .sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_SUBMIT_INFO,
      .commandBuffer = cmd_buf->cmd,
    };
    /* *INDENT-OFF* */
    VkSubmitInfo2 submit_info = (VkSubmitInfo2) {
        .sType = VK_STRUCTURE_TYPE_SUBMIT_INFO_2,
        .pCommandBufferInfos = &cmd_buf_info,
        .commandBufferInfoCount = 1,
    };
    /* *INDENT-ON* */

    fence = gst_vulkan_device_create_fence (vk_pool->device, &error);
    if (!fence)
      goto error;

    gst_vulkan_queue_submit_lock (priv->cmd_pool->queue);
    err =
        vkQueueSubmit2 (priv->cmd_pool->queue->queue, 1, &submit_info,
        GST_VULKAN_FENCE_FENCE (fence));
    gst_vulkan_queue_submit_unlock (priv->cmd_pool->queue);
    if (gst_vulkan_error_to_g_error (err, &error, "vkQueueSubmit2") < 0)
      goto error;

    gst_vulkan_trash_list_add (priv->trash_list,
        gst_vulkan_trash_list_acquire (priv->trash_list, fence,
            gst_vulkan_trash_mini_object_unref,
            GST_MINI_OBJECT_CAST (cmd_buf)));
    gst_vulkan_fence_unref (fence);

    if (!gst_vulkan_trash_list_wait (priv->trash_list, G_MAXUINT64))
      GST_WARNING_OBJECT (vk_pool, "Vulkan operation failed");
  }

  return TRUE;

  /* ERROR */
unlock_error:
  {
    if (cmd_buf)
      gst_vulkan_command_buffer_unlock (cmd_buf);
  }
error:
  {
    if (cmd_buf)
      gst_vulkan_command_buffer_unref (cmd_buf);
    if (error) {
      GST_WARNING_OBJECT (vk_pool, "Error: %s", error->message);
      g_clear_error (&error);
    }
    return FALSE;
  }
#endif
  return TRUE;
}

/* This function handles GstBuffer creation */
static GstFlowReturn
gst_vulkan_image_buffer_pool_alloc (GstBufferPool * pool, GstBuffer ** buffer,
    GstBufferPoolAcquireParams * params)
{
  GstVulkanImageBufferPool *vk_pool = GST_VULKAN_IMAGE_BUFFER_POOL_CAST (pool);
  GstVulkanImageBufferPoolPrivate *priv = GET_PRIV (vk_pool);
  VkImageTiling tiling =
      priv->raw_caps ? VK_IMAGE_TILING_LINEAR : VK_IMAGE_TILING_OPTIMAL;
  VkImageCreateInfo image_info;
  GstBuffer *buf;
  guint i;

  /* *INDENT-OFF* */
  image_info = (VkImageCreateInfo) {
    .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
    .pNext = NULL,
    .flags = 0,
    .imageType = VK_IMAGE_TYPE_2D,
    /* .format = fill per image,  */
    /* .extent = fill per plane, */
    .mipLevels = 1,
    .arrayLayers = 1,
    .samples = VK_SAMPLE_COUNT_1_BIT,
    .tiling = tiling,
    .usage = priv->usage,
    .sharingMode = VK_SHARING_MODE_EXCLUSIVE,
    .queueFamilyIndexCount = 0,
    .pQueueFamilyIndices = NULL,
    .initialLayout = VK_IMAGE_LAYOUT_UNDEFINED,
  };
  /* *INDENT-ON* */

  if (!(buf = gst_buffer_new ())) {
    goto no_buffer;
  }

  for (i = 0; i < priv->n_imgs; i++) {
    GstMemory *mem;
    guint width, height;
#if GST_VULKAN_HAVE_VIDEO_EXTENSIONS
    VkVideoProfileListInfoKHR profile_list = {
      .sType = VK_STRUCTURE_TYPE_VIDEO_PROFILE_LIST_INFO_KHR,
      .profileCount = 1,
      .pProfiles = &priv->profile.profile,
    };
#endif

    if (GST_VIDEO_INFO_N_PLANES (&priv->v_info) != priv->n_imgs) {
      width = GST_VIDEO_INFO_WIDTH (&priv->v_info);
      height = GST_VIDEO_INFO_HEIGHT (&priv->v_info);
    } else {
      width = GST_VIDEO_INFO_COMP_WIDTH (&priv->v_info, i);
      height = GST_VIDEO_INFO_COMP_HEIGHT (&priv->v_info, i);
    }

    image_info.format = priv->vk_fmts[i];
    /* *INDENT-OFF* */
    image_info.extent = (VkExtent3D) { width, height, 1 };
    /* *INDENT-ON* */
#if GST_VULKAN_HAVE_VIDEO_EXTENSIONS
    if (priv->has_profile)
      image_info.pNext = &profile_list;
#endif

    mem = gst_vulkan_image_memory_alloc_with_image_info (vk_pool->device,
        &image_info, priv->mem_props);
    if (!mem) {
      gst_buffer_unref (buf);
      goto mem_create_failed;
    }

    gst_buffer_append_memory (buf, mem);
  }

  prepare_buffer (vk_pool, buf);

  *buffer = buf;

  return GST_FLOW_OK;

  /* ERROR */
no_buffer:
  {
    GST_WARNING_OBJECT (pool, "can't create image");
    return GST_FLOW_ERROR;
  }
mem_create_failed:
  {
    GST_WARNING_OBJECT (pool, "Could not create Vulkan Memory");
    return GST_FLOW_ERROR;
  }
}

/**
 * gst_vulkan_image_buffer_pool_new:
 * @device: the #GstVulkanDevice to use
 *
 * Returns: (transfer full): a #GstBufferPool that allocates buffers with #GstGLMemory
 *
 * Since: 1.18
 */
GstBufferPool *
gst_vulkan_image_buffer_pool_new (GstVulkanDevice * device)
{
  GstVulkanImageBufferPool *pool;

  pool = g_object_new (GST_TYPE_VULKAN_IMAGE_BUFFER_POOL, NULL);
  g_object_ref_sink (pool);
  pool->device = gst_object_ref (device);

  GST_LOG_OBJECT (pool, "new Vulkan buffer pool for device %" GST_PTR_FORMAT,
      device);

#if (defined(VK_VERSION_1_3) || (defined(VK_VERSION_1_2) && VK_HEADER_VERSION >= 170))
  {
    GstVulkanImageBufferPoolPrivate *priv = GET_PRIV (pool);
    priv->has_sync2 = gst_vulkan_device_is_extension_enabled (device,
        VK_KHR_SYNCHRONIZATION_2_EXTENSION_NAME);
  }
#endif

  return GST_BUFFER_POOL_CAST (pool);
}

static void
gst_vulkan_image_buffer_pool_class_init (GstVulkanImageBufferPoolClass * klass)
{
  GObjectClass *gobject_class = (GObjectClass *) klass;
  GstBufferPoolClass *gstbufferpool_class = (GstBufferPoolClass *) klass;

  gobject_class->finalize = gst_vulkan_image_buffer_pool_finalize;

  gstbufferpool_class->set_config = gst_vulkan_image_buffer_pool_set_config;
  gstbufferpool_class->alloc_buffer = gst_vulkan_image_buffer_pool_alloc;
}

static void
gst_vulkan_image_buffer_pool_init (GstVulkanImageBufferPool * pool)
{
}

static void
gst_vulkan_image_buffer_pool_finalize (GObject * object)
{
  GstVulkanImageBufferPool *pool = GST_VULKAN_IMAGE_BUFFER_POOL_CAST (object);
  GstVulkanImageBufferPoolPrivate *priv = GET_PRIV (pool);

  GST_LOG_OBJECT (pool, "finalize Vulkan buffer pool %p", pool);

  if (priv->caps)
    gst_caps_unref (priv->caps);

  if (priv->cmd_pool)
    gst_object_unref (priv->cmd_pool);

  if (priv->trash_list)
    gst_object_unref (priv->trash_list);

  G_OBJECT_CLASS (gst_vulkan_image_buffer_pool_parent_class)->finalize (object);

  /* only release the context once all our memory have been deleted */
  if (pool->device) {
    gst_object_unref (pool->device);
    pool->device = NULL;
  }
}