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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_VIDEO_CAPTURE_H_
      6 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_VIDEO_CAPTURE_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/callback.h"
     12 #include "base/compiler_specific.h"
     13 #include "base/memory/scoped_ptr.h"
     14 #include "base/memory/weak_ptr.h"
     15 #include "base/threading/thread_checker.h"
     16 #include "base/time/time.h"
     17 #include "content/common/media/video_capture.h"
     18 #include "media/video/capture/video_capture_types.h"
     19 
     20 class GURL;
     21 
     22 namespace content {
     23 class PepperMediaDeviceManager;
     24 class PepperVideoCaptureHost;
     25 
     26 // This object must only be used on the thread it's constructed on.
     27 class PepperPlatformVideoCapture {
     28  public:
     29   PepperPlatformVideoCapture(int render_frame_id,
     30                              const std::string& device_id,
     31                              const GURL& document_url,
     32                              PepperVideoCaptureHost* handler);
     33   virtual ~PepperPlatformVideoCapture();
     34 
     35   // Detaches the event handler and stops sending notifications to it.
     36   void DetachEventHandler();
     37 
     38   void StartCapture(const media::VideoCaptureParams& params);
     39   void StopCapture();
     40 
     41  private:
     42   void OnDeviceOpened(int request_id, bool succeeded, const std::string& label);
     43   void OnStateUpdate(VideoCaptureState state);
     44   void OnFrameReady(const scoped_refptr<media::VideoFrame>& frame,
     45                     const media::VideoCaptureFormat& format,
     46                     const base::TimeTicks& estimated_capture_time);
     47 
     48   // Can return NULL if the RenderFrame referenced by |render_frame_id_| has
     49   // gone away.
     50   PepperMediaDeviceManager* GetMediaDeviceManager();
     51 
     52   const int render_frame_id_;
     53   const std::string device_id_;
     54 
     55   std::string label_;
     56   int session_id_;
     57   base::Closure release_device_cb_;
     58   base::Closure stop_capture_cb_;
     59 
     60   PepperVideoCaptureHost* handler_;
     61 
     62   // Whether we have a pending request to open a device. We have to make sure
     63   // there isn't any pending request before this object goes away.
     64   bool pending_open_device_;
     65   int pending_open_device_id_;
     66 
     67   base::ThreadChecker thread_checker_;
     68 
     69   base::WeakPtrFactory<PepperPlatformVideoCapture> weak_factory_;
     70 
     71   DISALLOW_COPY_AND_ASSIGN(PepperPlatformVideoCapture);
     72 };
     73 
     74 }  // namespace content
     75 
     76 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_VIDEO_CAPTURE_H_
     77