Support multiple video decoders and encoders

content/common/gpu/media/gpu_video_decode_accelerator.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 41 matching lines @@
   void NotifyEndOfBitstreamBuffer(int32 bitstream_buffer_id) override;
   void NotifyFlushDone() override;
   void NotifyResetDone() override;
 
   // GpuCommandBufferStub::DestructionObserver implementation.
   void OnWillDestroyStub() override;
 
   // Function to delegate sending to actual sender.
   bool Send(IPC::Message* message) override;
 
-  // Initialize the accelerator with the given profile and send the
-  // |init_done_msg| when done.
+  // Initialize VDAs from the set of VDAs supported for current platform until
+  // one of them succeeds for given |profile|. Send the |init_done_msg| when
+  // done. filter_ is passed to GpuCommandBufferStub channel only if the chosen
+  // VDA can decode on IO thread.
   void Initialize(const media::VideoCodecProfile profile,
                   IPC::Message* init_done_msg);
 
  private:
+  typedef scoped_ptr<media::VideoDecodeAccelerator>(
+      GpuVideoDecodeAccelerator::*CreateVDAFp)();
+
   class MessageFilter;
 
+  // Return a set of VDA Create function pointers applicable to the current
+  // platform.
+  std::vector<CreateVDAFp> CreateVDAFps();
+  scoped_ptr<media::VideoDecodeAccelerator> CreateDXVAVDA();
+  scoped_ptr<media::VideoDecodeAccelerator> CreateV4L2VDA();
+  scoped_ptr<media::VideoDecodeAccelerator> CreateVaapiVDA();
+  scoped_ptr<media::VideoDecodeAccelerator> CreateVTVDA();
+  scoped_ptr<media::VideoDecodeAccelerator> CreateOzoneVDA();
+  scoped_ptr<media::VideoDecodeAccelerator> CreateAndroidVDA();
+
   // We only allow self-delete, from OnWillDestroyStub(), after cleanup there.
   ~GpuVideoDecodeAccelerator() override;
 
   // Handlers for IPC messages.
   void OnDecode(base::SharedMemoryHandle handle, int32 id, uint32 size);
   void OnAssignPictureBuffers(const std::vector<int32>& buffer_ids,
                               const std::vector<uint32>& texture_ids);
   void OnReusePictureBuffer(int32 picture_buffer_id);
   void OnFlush();
   void OnReset();
@@ skipping 52 matching lines @@
 
   // A map from picture buffer ID to TextureRef that have not been cleared.
   std::map<int32, scoped_refptr<gpu::gles2::TextureRef> > uncleared_textures_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(GpuVideoDecodeAccelerator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_H_