VulkanDeviceHolder.h

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef DOM_MEDIA_PLATFORMS_FFMPEG_VULKANDEVICEHOLDER_H_

#define DOM_MEDIA_PLATFORMS_FFMPEG_VULKANDEVICEHOLDER_H_

#include "mozilla/ThreadSafeWeakPtr.h"

#include "nsISupportsImpl.h"

struct AVBufferRef;

namespace mozilla {

struct FFmpegLibWrapper;

// Holds a single shared AVHWDeviceContext (VkDevice) for all Vulkan video

// decoders in the RDD process. Mirrors VADisplayHolder for VA-API.

//

// The first decoder to call GetOrCreate() pays vkCreateDevice; subsequent

// decoders receive av_buffer_ref() on the same context. The device is

// destroyed (vkDestroyDevice) when the last decoder drops its reference.

class VulkanDeviceHolder final

    : public SupportsThreadSafeWeakPtr<VulkanDeviceHolder> {

 public:

  MOZ_DECLARE_REFCOUNTED_TYPENAME(VulkanDeviceHolder)

  static RefPtr<VulkanDeviceHolder> GetOrCreate(const FFmpegLibWrapper* aLib,

                                                const char* aDeviceName,

                                                const char* aDeviceExtensions);

  // Returns a new av_buffer_ref(); caller must av_buffer_unref() it.

  AVBufferRef* Ref() const;

  ~VulkanDeviceHolder();

 private:

  VulkanDeviceHolder(const FFmpegLibWrapper* aLib, AVBufferRef* aDeviceContext,

                     const char* aDeviceName);

  const FFmpegLibWrapper* mLib;

  AVBufferRef* mDeviceContext;

  // VK_MAX_PHYSICAL_DEVICE_NAME_SIZE is defined as 256 in the Vulkan spec.

  char mDeviceName[256] = {'\0'};

};

}  // namespace mozilla

#endif  // DOM_MEDIA_PLATFORMS_FFMPEG_VULKANDEVICEHOLDER_H_