Connect GpuVideoDecodeServiceHost with ggl::Context and CommandBufferProxy

chrome/renderer/gpu_video_service_host.h

 // Copyright (c) 2010 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 CHROME_RENDERER_GPU_VIDEO_SERVICE_HOST_H_
 #define CHROME_RENDERER_GPU_VIDEO_SERVICE_HOST_H_
 
 #include "base/singleton.h"
 #include "chrome/common/gpu_video_common.h"
 #include "chrome/renderer/gpu_channel_host.h"
 #include "chrome/renderer/gpu_video_decoder_host.h"
 #include "ipc/ipc_channel.h"
 #include "media/base/buffers.h"
 #include "media/base/video_frame.h"
 
+// A GpuVideoServiceHost is a singleton in the renderer process that provides
+// access to hardware accelerated video decoding device in the GPU process
+// though a GpuVideoDecoderHost.
 class GpuVideoServiceHost : public IPC::Channel::Listener,
                             public Singleton<GpuVideoServiceHost> {
  public:
   // IPC::Channel::Listener.
   virtual void OnChannelConnected(int32 peer_pid) {}
   virtual void OnChannelError();
   virtual void OnMessageReceived(const IPC::Message& message);
 
   void OnRendererThreadInit(MessageLoop* message_loop);
   void OnGpuChannelConnected(GpuChannelHost* channel_host,
                              MessageRouter* router,
                              IPC::SyncChannel* channel);
 
-  // call at RenderThread. one per renderer process.
-  scoped_refptr<GpuVideoDecoderHost> CreateVideoDecoder(
-      GpuVideoDecoderHost::EventHandler* event_handler);
-  void DestroyVideoDecoder(scoped_refptr<GpuVideoDecoderHost>);
+  // Called by GpuChannelHost when a GPU channel is established.
+  void OnGpuChannelConnected(GpuChannelHost* channel_host,

[scherkus (not reviewing), 2010/09/01 03:29:40]

wait.. this method is not declared twice

what's going on here? :P

+                             MessageRouter* router,
+                             IPC::SyncChannel* channel);
+
+  // Called on RenderThread to create a hardware accelerated video decoder
+  // in the GPU process.
+  //
+  // A routing ID for the GLES2 context needs to be provided when creating a
+  // hardware video decoder. This is important because the resources used by
+  // the video decoder needs to be shared with the GLES2 context corresponding
+  // to the RenderView.
+  //
+  // This means that a GPU video decoder is tied to a specific RenderView and
+  // its GLES2 context in the GPU process.
+  //
+  // Returns a GpuVideoDecoderHost as a handle to control the video decoder.
+  GpuVideoDecoderHost* CreateVideoDecoder(int context_route_id);
+
+  // TODO(hclam): Provide a method to destroy the decoder. We also need to
+  // listen to context lost event.
+
+  // Methods called by GpuVideoDecoderHost.
+  void AddRoute(int route_id, GpuVideoDecoderHost* decoder_host);
+  void RemoveRoute(int route_id);
 
  private:
   GpuVideoServiceHost();
 
   scoped_refptr<GpuChannelHost> channel_host_;
   MessageRouter* router_;
   GpuVideoServiceInfoParam service_info_;
   MessageLoop* message_loop_;  // Message loop of render thread.
 
   friend struct DefaultSingletonTraits<GpuVideoServiceHost>;
   DISALLOW_COPY_AND_ASSIGN(GpuVideoServiceHost);
 };
 
 #endif  // CHROME_RENDERER_GPU_VIDEO_SERVICE_HOST_H_
-