Sample code: IPC Transport object for GPU

content/common/gpu/client/gpu_video_encode_accelerator_host.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 CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_ENCODE_ACCELERATOR_HOST_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_ENCODE_ACCELERATOR_HOST_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "content/common/gpu/client/command_buffer_proxy_impl.h"
+#include "content/common/gpu/client/ipc/gpu_video_encode_accelerator_host_ipc_transport.h"
 #include "gpu/config/gpu_info.h"
-#include "ipc/ipc_listener.h"
 #include "media/video/video_encode_accelerator.h"
 
 namespace gfx {
 struct GpuMemoryBufferHandle;
 class Size;
 }  // namespace gfx
 
 namespace media {
 class VideoFrame;
 }  // namespace media
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace content {
 class GpuChannelHost;
 
 // This class is the renderer-side host for the VideoEncodeAccelerator in the
 // GPU process, coordinated over IPC.
 class GpuVideoEncodeAcceleratorHost
-    : public IPC::Listener,
-      public media::VideoEncodeAccelerator,
+    : public media::VideoEncodeAccelerator,
       public CommandBufferProxyImpl::DeletionObserver,
+      public GpuVideoEncodeAcceleratorHostIPCTransport::Client,
       public base::NonThreadSafe {
  public:
   // |this| is guaranteed not to outlive |channel| and |impl|.  (See comments
   // for |channel_| and |impl_|.)
-  GpuVideoEncodeAcceleratorHost(GpuChannelHost* channel,
-                                CommandBufferProxyImpl* impl);
-
-  // IPC::Listener implementation.
-  bool OnMessageReceived(const IPC::Message& message) override;
-  void OnChannelError() override;
+  GpuVideoEncodeAcceleratorHost(
+      GpuChannelHost* channel,
+      scoped_ptr<GpuVideoEncodeAcceleratorHostIPCTransport> transport,
+      CommandBufferProxyImpl* impl);
 
   // media::VideoEncodeAccelerator implementation.
   SupportedProfiles GetSupportedProfiles() override;
   bool Initialize(media::VideoPixelFormat input_format,
                   const gfx::Size& input_visible_size,
                   media::VideoCodecProfile output_profile,
                   uint32_t initial_bitrate,
-                  Client* client) override;
+                  media::VideoEncodeAccelerator::Client* client) override;
   void Encode(const scoped_refptr<media::VideoFrame>& frame,
               bool force_keyframe) override;
   void UseOutputBitstreamBuffer(const media::BitstreamBuffer& buffer) override;
   void RequestEncodingParametersChange(uint32_t bitrate,
                                        uint32_t framerate_num) override;
   void Destroy() override;
 
   // CommandBufferProxyImpl::DeletionObserver implementation.
   void OnWillDeleteImpl() override;
 
  private:
   // Only Destroy() should be deleting |this|.
   ~GpuVideoEncodeAcceleratorHost() override;
 
   // Encode specific video frame types.
   void EncodeGpuMemoryBufferFrame(const scoped_refptr<media::VideoFrame>& frame,
                                   bool force_keyframe);
   void EncodeSharedMemoryFrame(const scoped_refptr<media::VideoFrame>& frame,
                                bool force_keyframe);
 
   // Notify |client_| of an error.  Posts a task to avoid re-entrancy.
   void PostNotifyError(const tracked_objects::Location& location,
                        Error error, const std::string& message);
 
-  void Send(IPC::Message* message);
-
   // IPC handlers, proxying media::VideoEncodeAccelerator::Client for the GPU
   // process.  Should not be called directly.
   void OnRequireBitstreamBuffers(uint32_t input_count,
                                  const gfx::Size& input_coded_size,
-                                 uint32_t output_buffer_size);
-  void OnNotifyInputDone(int32_t frame_id);
+                                 uint32_t output_buffer_size) override;
+  void OnNotifyInputDone(int32_t frame_id) override;
   void OnBitstreamBufferReady(int32_t bitstream_buffer_id,
                               uint32_t payload_size,
-                              bool key_frame);
-  void OnNotifyError(Error error);
+                              bool key_frame) override;
+  void OnNotifyError(Error error) override;
 
   // Unowned reference to the GpuChannelHost to send IPC messages to the GPU
   // process.  |channel_| outlives |impl_|, so the reference is always valid as
   // long as it is not NULL.
   GpuChannelHost* channel_;
 
-  // Route ID for the associated encoder in the GPU process.
-  int32_t encoder_route_id_;
+  scoped_ptr<GpuVideoEncodeAcceleratorHostIPCTransport> transport_;
 
   // The client that will receive callbacks from the encoder.
-  Client* client_;
+  media::VideoEncodeAccelerator::Client* client_;
 
   // Unowned reference to the CommandBufferProxyImpl that created us.  |this|
   // registers as a DeletionObserver of |impl_|, so the reference is always
   // valid as long as it is not NULL.
   CommandBufferProxyImpl* impl_;
 
   // media::VideoFrames sent to the encoder.
   // base::IDMap not used here, since that takes pointers, not scoped_refptr.
   typedef base::hash_map<int32_t, scoped_refptr<media::VideoFrame>> FrameMap;
   FrameMap frame_map_;
 
   // ID serial number for the next frame to send to the GPU process.
   int32_t next_frame_id_;
 
   // WeakPtr factory for posting tasks back to itself.
   base::WeakPtrFactory<GpuVideoEncodeAcceleratorHost> weak_this_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuVideoEncodeAcceleratorHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_ENCODE_ACCELERATOR_HOST_H_