vulkan: add gst_vulkan_video_image_create_view()

This function is moved from gstvkdecoder-private so it could be used by
gstvkencoder-private too, removing there what it should be duplicated code.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7984>

subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkdecoder-private.c

@@ -1088,61 +1088,14 @@ gst_vulkan_decoder_picture_create_view (GstVulkanDecoder * self,
     GstBuffer * buf, gboolean is_out)
 {
   GstVulkanDecoderPrivate *priv;
-  VkSamplerYcbcrConversionInfo yuv_sampler_info;
-  VkImageViewCreateInfo view_create_info;
-  GstVulkanImageMemory *vkmem;
-  GstMemory *mem;
-  gpointer pnext;
-  guint n_mems;
 
   g_return_val_if_fail (GST_IS_VULKAN_DECODER (self) && GST_IS_BUFFER (buf),
       NULL);
 
-  n_mems = gst_buffer_n_memory (buf);
-  if (n_mems != 1)
-    return NULL;
-
-  mem = gst_buffer_peek_memory (buf, 0);
-  if (!gst_is_vulkan_image_memory (mem))
-    return NULL;
-
   priv = gst_vulkan_decoder_get_instance_private (self);
 
-  pnext = NULL;
-  if (priv->sampler) {
-    /* *INDENT-OFF* */
-    yuv_sampler_info = (VkSamplerYcbcrConversionInfo) {
-      .sType = VK_STRUCTURE_TYPE_SAMPLER_YCBCR_CONVERSION_INFO,
-      .conversion = priv->sampler->handle,
-    };
-    /* *INDENT-ON* */
-
-    pnext = &yuv_sampler_info;
-  }
-
-  vkmem = (GstVulkanImageMemory *) mem;
-
-  /* *INDENT-OFF* */
-  view_create_info = (VkImageViewCreateInfo) {
-    .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
-    .pNext = pnext,
-    .viewType = self->layered_dpb && !is_out ?
-        VK_IMAGE_VIEW_TYPE_2D_ARRAY: VK_IMAGE_VIEW_TYPE_2D,
-    .format = vkmem->create_info.format,
-    .image = vkmem->image,
-    .components = _vk_identity_component_map,
-    .subresourceRange = (VkImageSubresourceRange) {
-      .aspectMask     = VK_IMAGE_ASPECT_COLOR_BIT,
-      .baseArrayLayer = 0,
-      .layerCount     = self->layered_dpb && !is_out ?
-          VK_REMAINING_ARRAY_LAYERS : 1,
-      .levelCount     = 1,
-    },
-  };
-  /* *INDENT-ON* */
-
-  return gst_vulkan_get_or_create_image_view_with_info (vkmem,
-      &view_create_info);
+  return gst_vulkan_video_image_create_view (buf, self->layered_dpb, is_out,
+      priv->sampler);
 }
 
 /**

subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkencoder-private.c

@@ -372,45 +372,6 @@ gst_vulkan_encoder_new_video_session_parameters (GstVulkanEncoder * self,
       priv->vk.DestroyVideoSessionParameters);
 }
 
-static GstVulkanImageView *
-gst_vulkan_encoder_get_image_view_from_buffer (GstVulkanEncoder * self,
-    GstBuffer * buf, gboolean dpb)
-{
-  GstVulkanEncoderPrivate *priv =
-      gst_vulkan_encoder_get_instance_private (self);
-  VkImageViewCreateInfo view_create_info;
-  GstVulkanImageMemory *vkmem;
-  GstMemory *mem;
-  guint n_mems;
-
-  n_mems = gst_buffer_n_memory (buf);
-  g_assert (n_mems == 1);
-
-  mem = gst_buffer_peek_memory (buf, 0);
-  g_assert (gst_is_vulkan_image_memory (mem));
-
-  vkmem = (GstVulkanImageMemory *) mem;
-
-  /* *INDENT-OFF* */
-  view_create_info = (VkImageViewCreateInfo) {
-    .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
-    .viewType = (dpb && priv->layered_dpb) ? VK_IMAGE_VIEW_TYPE_2D_ARRAY : VK_IMAGE_VIEW_TYPE_2D,
-    .format = vkmem->create_info.format,
-    .image = vkmem->image,
-    .components = _vk_identity_component_map,
-    .subresourceRange = (VkImageSubresourceRange) {
-      .aspectMask     = VK_IMAGE_ASPECT_COLOR_BIT,
-      .baseArrayLayer = (dpb && priv->layered_dpb) ? priv->current_slot_index : 0,
-      .layerCount     = 1,
-      .levelCount     = 1,
-    },
-  };
-  /* *INDENT-ON* */
-
-  return gst_vulkan_get_or_create_image_view_with_info (vkmem,
-      &view_create_info);
-}
-
 /**
  * gst_vulkan_encode_picture_new:
  * @self: the #GstVulkanEncoder with the pool's configuration.
@@ -1141,9 +1102,8 @@ gst_vulkan_encoder_encode (GstVulkanEncoder * self,
   /* Set the ref slots according to the pic refs to bound the video
      session encoding. It should contain all the references + 1 to book
      a new slotIndex (-1) for the current picture. */
-  pic->dpb_view =
-      gst_vulkan_encoder_get_image_view_from_buffer (self, pic->dpb_buffer,
-      TRUE);
+  pic->dpb_view = gst_vulkan_video_image_create_view (pic->dpb_buffer,
+      priv->layered_dpb, FALSE, NULL);
 
   /* *INDENT-OFF* */
   pic->dpb = (VkVideoPictureResourceInfoKHR) {
@@ -1248,9 +1208,8 @@ gst_vulkan_encoder_encode (GstVulkanEncoder * self,
   /* Peek the output memory to be used by VkVideoEncodeInfoKHR.dstBuffer */
   mem = gst_buffer_peek_memory (pic->out_buffer, n_mems);
   /* Peek the image view to be encoded */
-  pic->img_view =
-      gst_vulkan_encoder_get_image_view_from_buffer (self, pic->in_buffer,
-      FALSE);
+  pic->img_view = gst_vulkan_video_image_create_view (pic->in_buffer,
+      priv->layered_dpb, TRUE, NULL);
 
   /* Attribute a free slot index to the picture to be used later as a reference.
    * The picture is kept until it remains useful to the encoding process.*/

subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkvideo-private.c

@@ -241,3 +241,74 @@ gst_vulkan_video_codec_buffer_new (GstVulkanDevice * device,
   gst_buffer_append_memory (buf, mem);
   return buf;
 }
+
+/**
+ * gst_vulkan_video_image_create_view:
+ * @buf: a #GstBuffer
+ * @layered_dpb: if DPB is layered
+ * @is_out: if @buf is for output or for DPB
+ * @sampler: (optional): sampler #GstVulkanHandle
+ *
+ * Creates a #GstVulkanImageView for @buf for decoding, with the internal Ycbcr
+ * sampler, if available.
+ *
+ * Returns: (transfer full) (nullable): the #GstVulkanImageView.
+ */
+GstVulkanImageView *
+gst_vulkan_video_image_create_view (GstBuffer * buf, gboolean layered_dpb,
+    gboolean is_out, GstVulkanHandle * sampler)
+{
+  VkSamplerYcbcrConversionInfo yuv_sampler_info;
+  VkImageViewCreateInfo view_create_info;
+  GstVulkanImageMemory *vkmem;
+  GstMemory *mem;
+  gpointer pnext;
+  guint n_mems;
+
+  g_return_val_if_fail (GST_IS_BUFFER (buf), NULL);
+
+  n_mems = gst_buffer_n_memory (buf);
+  if (n_mems != 1)
+    return NULL;
+
+  mem = gst_buffer_peek_memory (buf, 0);
+  if (!gst_is_vulkan_image_memory (mem))
+    return NULL;
+
+  pnext = NULL;
+  if (sampler
+      && sampler->type == GST_VULKAN_HANDLE_TYPE_SAMPLER_YCBCR_CONVERSION) {
+    yuv_sampler_info = (VkSamplerYcbcrConversionInfo) {
+      /* *INDENT-OFF* */
+      .sType = VK_STRUCTURE_TYPE_SAMPLER_YCBCR_CONVERSION_INFO,
+      .conversion = sampler->handle,
+      /* *INDENT-ON* */
+    };
+
+    pnext = &yuv_sampler_info;
+  }
+
+  vkmem = (GstVulkanImageMemory *) mem;
+
+  /* *INDENT-OFF* */
+  view_create_info = (VkImageViewCreateInfo) {
+    .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
+    .pNext = pnext,
+    .viewType = layered_dpb && !is_out ?
+        VK_IMAGE_VIEW_TYPE_2D_ARRAY: VK_IMAGE_VIEW_TYPE_2D,
+    .format = vkmem->create_info.format,
+    .image = vkmem->image,
+    .components = _vk_identity_component_map,
+    .subresourceRange = (VkImageSubresourceRange) {
+      .aspectMask     = VK_IMAGE_ASPECT_COLOR_BIT,
+      .baseArrayLayer = 0,
+      .layerCount     = layered_dpb && !is_out ?
+          VK_REMAINING_ARRAY_LAYERS : 1,
+      .levelCount     = 1,
+    },
+  };
+  /* *INDENT-ON* */
+
+  return gst_vulkan_get_or_create_image_view_with_info (vkmem,
+      &view_create_info);
+}

subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkvideo-private.h

@@ -91,4 +91,9 @@ GstBuffer *             gst_vulkan_video_codec_buffer_new       (GstVulkanDevice
                                                                  VkBufferUsageFlags usage,
                                                                  gsize size);
 
+GstVulkanImageView *    gst_vulkan_video_image_create_view     (GstBuffer * buf,
+                                                                gboolean layered_dpb,
+                                                                gboolean is_out,
+                                                                GstVulkanHandle * sampler);
+
 G_END_DECLS