Move video encode accelerator IPC messages to GPU IO thread

media/gpu/ipc/service/gpu_video_encode_accelerator.h

 // Copyright 2013 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 MEDIA_GPU_IPC_SERVICE_GPU_VIDEO_ENCODE_ACCELERATOR_H_
 #define MEDIA_GPU_IPC_SERVICE_GPU_VIDEO_ENCODE_ACCELERATOR_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/synchronization/waitable_event.h"
 #include "gpu/config/gpu_info.h"
 #include "gpu/ipc/service/gpu_command_buffer_stub.h"
 #include "ipc/ipc_listener.h"
 #include "media/video/video_encode_accelerator.h"
 #include "ui/gfx/geometry/size.h"
 
 struct AcceleratedVideoEncoderMsg_Encode_Params;
 
 namespace base {
 class SharedMemory;
 }  // namespace base
 
 namespace gpu {
 struct GpuPreferences;
 }  // namespace gpu
 
 namespace media {
 
 // This class encapsulates the GPU process view of a VideoEncodeAccelerator,
 // wrapping the platform-specific VideoEncodeAccelerator instance.  It handles
 // IPC coming in from the renderer and passes it to the underlying VEA.
 class GpuVideoEncodeAccelerator
     : public IPC::Listener,
       public VideoEncodeAccelerator::Client,
       public gpu::GpuCommandBufferStub::DestructionObserver {
  public:
-  GpuVideoEncodeAccelerator(int32_t host_route_id,
-                            gpu::GpuCommandBufferStub* stub);
+  GpuVideoEncodeAccelerator(
+      int32_t host_route_id,
+      gpu::GpuCommandBufferStub* stub,
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
   ~GpuVideoEncodeAccelerator() override;
 
   // Initialize this accelerator with the given parameters and send
   // |init_done_msg| when complete.
   bool Initialize(VideoPixelFormat input_format,
                   const gfx::Size& input_visible_size,
                   VideoCodecProfile output_profile,
                   uint32_t initial_bitrate);
 
   // IPC::Listener implementation
@@ skipping 11 matching lines @@
 
   // gpu::GpuCommandBufferStub::DestructionObserver implementation.
   void OnWillDestroyStub() override;
 
   // Static query for supported profiles.  This query calls the appropriate
   // platform-specific version. The returned supported profiles vector will
   // not contain duplicates.
   static gpu::VideoEncodeAcceleratorSupportedProfiles GetSupportedProfiles(
       const gpu::GpuPreferences& gpu_preferences);
 
+  // Called on IO thread when |filter_| has been removed.
+  void OnFilterRemoved();
+
  private:
   // Returns a vector of VEAFactoryFunctions for the current platform.
   using VEAFactoryFunction =
       base::Callback<std::unique_ptr<VideoEncodeAccelerator>()>;
   static std::vector<VEAFactoryFunction> GetVEAFactoryFunctions(
       const gpu::GpuPreferences& gpu_preferences);
 
+  class MessageFilter;
+
   // IPC handlers, proxying VideoEncodeAccelerator for the renderer
   // process.
   void OnEncode(const AcceleratedVideoEncoderMsg_Encode_Params& params);
   void OnUseOutputBitstreamBuffer(int32_t buffer_id,
                                   base::SharedMemoryHandle buffer_handle,
                                   uint32_t buffer_size);
   void OnRequestEncodingParametersChange(uint32_t bitrate, uint32_t framerate);
 
   void OnDestroy();
 
   void EncodeFrameFinished(int32_t frame_id,
                            std::unique_ptr<base::SharedMemory> shm);
-  void Send(IPC::Message* message);
+  bool Send(IPC::Message* message);
+
+  // Checks that function is called on the correct thread. If MessageFilter is
+  // used, checks if it is called on |io_task_runner_|. If not, checks if it is
+  // called on |main_task_runner_|.
+  bool CheckCalledOnMessageFilterThread();

[Pawel Osciak, 2016/10/25 01:44:05]

Since this checks whether we are on message filter or main thread, perhaps
should be called CheckIfCalledOnCorrectThread() or something like that instead?

[emircan, 2016/10/25 21:57:51]

Done.

 
   // Route ID to communicate with the host.
   const uint32_t host_route_id_;
 
   // Unowned pointer to the underlying gpu::GpuCommandBufferStub.  |this| is
   // registered as a DestuctionObserver of |stub_| and will self-delete when
   // |stub_| is destroyed.
   gpu::GpuCommandBufferStub* const stub_;
 
   // Owned pointer to the underlying VideoEncodeAccelerator.
   std::unique_ptr<VideoEncodeAccelerator> encoder_;
   base::Callback<bool(void)> make_context_current_;
 
   // Video encoding parameters.
   VideoPixelFormat input_format_;
   gfx::Size input_visible_size_;
   gfx::Size input_coded_size_;
   size_t output_buffer_size_;
 
+  // The message filter to run VDA::Decode on IO thread if VDA supports it.

[Pawel Osciak, 2016/10/25 01:44:05]

"VDA::Decode", "VDA"...

[emircan, 2016/10/25 21:57:51]

Done.

+  scoped_refptr<MessageFilter> filter_;
+
+  // Used to wait on for |filter_| to be removed, before we can safely
+  // destroy the VEA.
+  base::WaitableEvent filter_removed_;
+
+  // GPU main thread task runner.
+  const scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
+
+  // GPU IO thread task runner.
+  const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+
   // Weak pointer for VideoFrames that refer back to |this|.
   base::WeakPtrFactory<GpuVideoEncodeAccelerator> weak_this_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuVideoEncodeAccelerator);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_GPU_IPC_SERVICE_GPU_VIDEO_ENCODE_ACCELERATOR_H_