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a7c2aa473f
Weak refs don't quite work here correctly as there is always a race with taking the lock between find_view() and remove_view(). If find_view() returns a view that is going to removed by remove_view() then we have an interesting situation. In theory, the number and type of views for an image are relatively constant and should not change one they've been set up which means that it is actually practical to perform pool-like reference counting here where the image holds a pool of different views that it can give out as necessary.
149 lines
4 KiB
C
149 lines
4 KiB
C
/*
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* GStreamer
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* Copyright (C) 2019 Matthew Waters <matthew@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/vulkan/vulkan.h>
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/**
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* SECTION:vkimageview
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* @title: GstVulkanImageView
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* @short_description: wrapper for `VkImageView`'s
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* @see_also: #GstVulkanImageMemory
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*
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* #GstVulkanImageView is a wrapper around a `VkImageView` mostly for
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* usage across element boundaries with #GstVulkanImageMemory
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*/
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#define GST_CAT_DEFUALT GST_CAT_VULKAN_IMAGE_VIEW
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFUALT);
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static void
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init_debug (void)
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{
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static volatile gsize _init = 0;
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if (g_once_init_enter (&_init)) {
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GST_DEBUG_CATEGORY_INIT (GST_CAT_VULKAN_IMAGE_VIEW, "vulkanimageview",
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0, "Vulkan Image View");
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g_once_init_leave (&_init, 1);
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}
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}
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extern void
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gst_vulkan_image_memory_release_view (GstVulkanImageMemory * image,
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GstVulkanImageView * view);
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static gboolean
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gst_vulkan_image_view_dispose (GstVulkanImageView * view)
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{
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GstVulkanImageMemory *image;
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if ((image = view->image) == NULL)
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return TRUE;
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gst_vulkan_image_view_ref (view);
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gst_vulkan_image_memory_release_view (image, view);
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return FALSE;
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}
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static void
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gst_vulkan_image_view_free (GstVulkanImageView * view)
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{
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GST_CAT_TRACE (GST_CAT_VULKAN_IMAGE_VIEW, "freeing image view:%p ", view);
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if (view->view)
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vkDestroyImageView (view->device->device, view->view, NULL);
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if (view->image) {
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gst_memory_unref (GST_MEMORY_CAST (view->image));
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}
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view->image = NULL;
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gst_clear_object (&view->device);
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g_free (view);
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}
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/**
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* gst_vulkan_image_view_new:
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* @image: a #GstVulkanImageMemory to create the new view from
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* @create_info: the creation information to create the view from
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*
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* Returns: (transfer full): A new #GstVulkanImageView from @image and
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* @create_info
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*/
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GstVulkanImageView *
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gst_vulkan_image_view_new (GstVulkanImageMemory * image,
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VkImageViewCreateInfo * create_info)
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{
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GstVulkanImageView *view;
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GError *error = NULL;
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VkResult err;
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g_return_val_if_fail (create_info != NULL, NULL);
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g_return_val_if_fail (gst_is_vulkan_image_memory (GST_MEMORY_CAST (image)),
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NULL);
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init_debug ();
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view = g_new0 (GstVulkanImageView, 1);
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gst_mini_object_init ((GstMiniObject *) view, 0,
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gst_vulkan_image_view_get_type (), NULL,
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(GstMiniObjectDisposeFunction) gst_vulkan_image_view_dispose,
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(GstMiniObjectFreeFunction) gst_vulkan_image_view_free);
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err =
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vkCreateImageView (image->device->device, create_info, NULL, &view->view);
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if (gst_vulkan_error_to_g_error (err, &error, "vkImageCreateView") < 0)
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goto vk_error;
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view->image =
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(GstVulkanImageMemory *) gst_memory_ref (GST_MEMORY_CAST (image));
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view->device = gst_object_ref (image->device);
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view->create_info = *create_info;
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/* we cannot keep this as it may point to stack allocated memory */
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view->create_info.pNext = NULL;
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GST_CAT_TRACE (GST_CAT_VULKAN_IMAGE_VIEW, "new image view for image: %p",
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image);
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return view;
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vk_error:
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{
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GST_CAT_ERROR (GST_CAT_VULKAN_IMAGE_VIEW,
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"Failed to allocate image memory %s", error->message);
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g_clear_error (&error);
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goto error;
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}
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error:
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{
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g_free (view);
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return NULL;
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}
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}
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GST_DEFINE_MINI_OBJECT_TYPE (GstVulkanImageView, gst_vulkan_image_view);
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