support video device enumeration from renderer process.

content/renderer/media/media_stream_impl.h

 // Copyright (c) 2011 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_RENDERER_MEDIA_STREAM_MEDIA_STREAM_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_STREAM_MEDIA_STREAM_IMPL_H_
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
+#include "content/renderer/media/media_stream_dispatcher_eventhandler.h"
 #include "webkit/glue/media/media_stream_client.h"
 
+class MediaStreamDispatcher;
 class VideoCaptureImplManager;
 
 // A implementation of StreamClient to provide supporting functions, such as
 // GetVideoDecoder.
 class MediaStreamImpl
     : public webkit_glue::MediaStreamClient,
+      public MediaStreamDispatcherEventHandler,
       public base::RefCountedThreadSafe<MediaStreamImpl> {
  public:
-  explicit MediaStreamImpl(VideoCaptureImplManager* vc_manager);
+  explicit MediaStreamImpl(MediaStreamDispatcher* media_stream_dispatcher_,
+                           VideoCaptureImplManager* vc_manager);
   virtual ~MediaStreamImpl();
 
+  virtual void GetVideoDevice(int index);
+
   // Implement webkit_glue::StreamClient.
   virtual scoped_refptr<media::VideoDecoder> GetVideoDecoder(
-      const GURL& url, media::MessageLoopFactory* message_loop_factory);
+      const GURL& url,
+      media::MessageLoopFactory* message_loop_factory) OVERRIDE;
+
+  // Implement MediaStreamDispatcherEventHandler.
+  virtual void OnStreamGenerated(
+      int request_id,
+      const std::string& label,
+      const media_stream::StreamDeviceInfoArray& audio_array,
+      const media_stream::StreamDeviceInfoArray& video_array) OVERRIDE;
+  virtual void OnStreamGenerationFailed(int request_id) OVERRIDE;
+  virtual void OnVideoDeviceFailed(
+      const std::string& label,
+      int index) OVERRIDE;
+  virtual void OnAudioDeviceFailed(
+      const std::string& label,
+      int index) OVERRIDE;
+  virtual void OnVideoDevicesEnumerated(
+      int request_id,
+      const media_stream::StreamDeviceInfoArray& device_array) OVERRIDE;
+  virtual void OnVideoDevicesEnumerationFailed(int request_id) OVERRIDE;
+  virtual void OnVideoDeviceOpened(
+      int request_id,
+      const std::string& label,
+      const media_stream::StreamDeviceInfo& video_device) OVERRIDE;
+  virtual void OnVideoDeviceOpenFailed(int request_id) OVERRIDE;
 
  private:
+  // media_stream_dispatcher_ is a weak reference, owned by RenderView. It's
+  // valid for the lifetime of RenderView.
+  MediaStreamDispatcher* media_stream_dispatcher_;
+
+  std::string local_label_;
   scoped_refptr<VideoCaptureImplManager> vc_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamImpl);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_STREAM_MEDIA_STREAM_IMPL_H_