From Video Capture, abolish OnFrameInfo and enable resolution changes

content/browser/renderer_host/media/video_capture_controller.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.
 //
 // VideoCaptureController is the glue between a VideoCaptureDevice and all
 // VideoCaptureHosts that have connected to it. A controller exists on behalf of
 // one (and only one) VideoCaptureDevice; both are owned by the
 // VideoCaptureManager.
 //
 // The VideoCaptureController is responsible for:
@@ skipping 37 matching lines @@
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_H_
 
 #include <list>
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process.h"
-#include "base/synchronization/lock.h"
 #include "content/browser/renderer_host/media/video_capture_buffer_pool.h"
 #include "content/browser/renderer_host/media/video_capture_controller_event_handler.h"
 #include "content/common/content_export.h"
 #include "content/common/media/video_capture.h"
 #include "media/video/capture/video_capture.h"
 #include "media/video/capture/video_capture_device.h"
 #include "media/video/capture/video_capture_types.h"
 
 namespace content {
 class VideoCaptureBufferPool;
 
 class CONTENT_EXPORT VideoCaptureController {
  public:
   VideoCaptureController();
   virtual ~VideoCaptureController();
 
   base::WeakPtr<VideoCaptureController> GetWeakPtr();
 
   // Return a new VideoCaptureDeviceClient to forward capture events to this
   // instance.
   scoped_ptr<media::VideoCaptureDevice::Client> NewDeviceClient();
 
-  // Start video capturing and try to use the resolution specified in
-  // |params|.
-  // When capturing starts, the |event_handler| will receive an OnFrameInfo()
-  // call informing it of the resolution that was actually picked by the device.
+  // Start video capturing and try to use the resolution specified in |params|.
+  // Buffers will be shared to the client as necessary. The client will continue
+  // to receive frames from the device until RemoveClient() is called.
   void AddClient(const VideoCaptureControllerID& id,
                  VideoCaptureControllerEventHandler* event_handler,
                  base::ProcessHandle render_process,
                  const media::VideoCaptureParams& params);
 
   // Stop video capture. This will take back all buffers held by by
   // |event_handler|, and |event_handler| shouldn't use those buffers any more.
   // Returns the session_id of the stopped client, or
   // kInvalidMediaCaptureSessionId if the indicated client was not registered.
   int RemoveClient(const VideoCaptureControllerID& id,
@@ skipping 13 matching lines @@
 
  private:
   class VideoCaptureDeviceClient;
 
   struct ControllerClient;
   typedef std::list<ControllerClient*> ControllerClients;
 
   // Worker functions on IO thread. Called by the VideoCaptureDeviceClient.
   void DoIncomingCapturedFrameOnIOThread(
       const scoped_refptr<media::VideoFrame>& captured_frame,
+      int frame_rate,
       base::Time timestamp);
-  void DoFrameInfoOnIOThread(
-      const media::VideoCaptureCapability& frame_info,
-      const scoped_refptr<VideoCaptureBufferPool>& buffer_pool);
-  void DoFrameInfoChangedOnIOThread(const media::VideoCaptureCapability& info);
   void DoErrorOnIOThread();
   void DoDeviceStoppedOnIOThread();
-
-  // Send frame info and init buffers to |client|.
-  void SendFrameInfoAndBuffers(ControllerClient* client);
+  void DoBufferDestroyedOnIOThread(int buffer_id_to_drop);
 
   // Find a client of |id| and |handler| in |clients|.
   ControllerClient* FindClient(
       const VideoCaptureControllerID& id,
       VideoCaptureControllerEventHandler* handler,
       const ControllerClients& clients);
 
   // Find a client of |session_id| in |clients|.
   ControllerClient* FindClient(
       int session_id,
       const ControllerClients& clients);
 
   // The pool of shared-memory buffers used for capturing.
-  scoped_refptr<VideoCaptureBufferPool> buffer_pool_;
+  const scoped_refptr<VideoCaptureBufferPool> buffer_pool_;
 
   // All clients served by this controller.
   ControllerClients controller_clients_;
 
-  // The parameter that currently used for the capturing.
-  media::VideoCaptureParams current_params_;
-
-  // Tracks the current frame format.
-  media::VideoCaptureCapability frame_info_;
-
   // Takes on only the states 'STARTED' and 'ERROR'. 'ERROR' is an absorbing
   // state which stops the flow of data to clients.
   VideoCaptureState state_;
 
   base::WeakPtrFactory<VideoCaptureController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureController);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_H_