vkbufferpool: allow to set allocation params

Add the possibility to change the vulkan usage and mem properties from
external source.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5645>

girs/GstVulkan-1.0.gir

@@ -1102,6 +1102,26 @@ multiple times.  This must be called before any other #GstVulkanBufferMemory ope
           </parameter>
         </parameters>
       </constructor>
+      <function name="config_set_allocation_params" c:identifier="gst_vulkan_buffer_pool_config_set_allocation_params" version="1.24">
+        <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkbufferpool.c">Sets the @usage of the buffers to setup.</doc>
+        <source-position filename="../subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkbufferpool.h"/>
+        <return-value transfer-ownership="none">
+          <type name="none" c:type="void"/>
+        </return-value>
+        <parameters>
+          <parameter name="config" transfer-ownership="none">
+            <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkbufferpool.c">the #GstStructure with the pool's configuration.</doc>
+            <type name="Gst.Structure" c:type="GstStructure*"/>
+          </parameter>
+          <parameter name="usage" transfer-ownership="none">
+            <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkbufferpool.c">The Vulkan buffer usage flags.</doc>
+            <type name="Vulkan.ImageUsageFlags" c:type="VkImageUsageFlags"/>
+          </parameter>
+          <parameter name="mem_properties" transfer-ownership="none">
+            <type name="Vulkan.MemoryPropertyFlags" c:type="VkMemoryPropertyFlags"/>
+          </parameter>
+        </parameters>
+      </function>
       <field name="bufferpool">
         <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkbufferpool.h">the parent #GstBufferPool</doc>
         <type name="Gst.BufferPool" c:type="GstBufferPool"/>

subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkbufferpool.c

@@ -44,6 +44,8 @@ struct _GstVulkanBufferPoolPrivate
   GstCaps *caps;
   GstVideoInfo v_info;
   gboolean add_videometa;
+  VkImageUsageFlags usage;
+  VkMemoryPropertyFlags mem_props;
   gsize alloc_sizes[GST_VIDEO_MAX_PLANES];
 };
 
@@ -70,6 +72,39 @@ gst_vulkan_buffer_pool_get_options (GstBufferPool * pool)
   return options;
 }
 
+static inline gboolean
+gst_vulkan_buffer_pool_config_get_allocation_params (GstStructure *
+    config, VkImageUsageFlags * usage, VkMemoryPropertyFlags * mem_props)
+{
+  if (!gst_structure_get_uint (config, "usage", usage)) {
+    *usage =
+        VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT;
+  }
+
+  if (!gst_structure_get_uint (config, "memory-properties", mem_props))
+    *mem_props = VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT;
+
+  return TRUE;
+}
+
+/**
+ * gst_vulkan_buffer_pool_config_set_allocation_params:
+ * @config: the #GstStructure with the pool's configuration.
+ * @usage: The Vulkan buffer usage flags.
+ *
+ * Sets the @usage of the buffers to setup.
+ *
+ * Since: 1.24
+ */
+void
+gst_vulkan_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);
+}
+
 static gboolean
 gst_vulkan_buffer_pool_set_config (GstBufferPool * pool, GstStructure * config)
 {
@@ -96,6 +131,9 @@ gst_vulkan_buffer_pool_set_config (GstBufferPool * pool, GstStructure * config)
 
   gst_caps_replace (&priv->caps, caps);
 
+  gst_vulkan_buffer_pool_config_get_allocation_params (config,
+      &priv->usage, &priv->mem_props);
+
   /* get the size of the buffer to allocate */
   priv->v_info.size = 0;
   for (i = 0; i < GST_VIDEO_INFO_N_PLANES (&priv->v_info); i++) {
@@ -110,7 +148,6 @@ gst_vulkan_buffer_pool_set_config (GstBufferPool * pool, GstStructure * config)
 
   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 */
@@ -150,10 +187,7 @@ gst_vulkan_buffer_pool_alloc (GstBufferPool * pool, GstBuffer ** buffer,
     GstMemory *mem;
 
     mem = gst_vulkan_buffer_memory_alloc (vk_pool->device, priv->alloc_sizes[i],
-        /* FIXME: choose from outside */
+        priv->usage, priv->mem_props);
-        VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
-        /* FIXME: choose from outside */
-        VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT);
     if (!mem) {
       gst_buffer_unref (buf);
       goto mem_create_failed;

subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkbufferpool.h

@@ -81,6 +81,12 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstVulkanBufferPool, gst_object_unref);
 GST_VULKAN_API
 GstBufferPool *gst_vulkan_buffer_pool_new               (GstVulkanDevice * device);
 
+GST_VULKAN_API
+void            gst_vulkan_buffer_pool_config_set_allocation_params
+                                                        (GstStructure * config,
+                                                         VkImageUsageFlags usage,
+                                                         VkMemoryPropertyFlags mem_properties);
+
 G_END_DECLS
 
 #endif /* __GST_VULKAN_BUFFER_POOL_H__ */