content/renderer/media/media_stream_video_capturer_source.h

   1 // Copyright 2014 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_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
   6 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
   7
   8 #include "base/callback.h"
   9 #include "base/gtest_prod_util.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "base/threading/thread_checker.h"
  12 #include "content/common/media/video_capture.h"
  13 #include "content/renderer/media/media_stream_video_source.h"
  14 #include "media/base/video_capturer_source.h"
  15
  16 namespace content {
  17
  18 // VideoCapturerDelegate is a delegate used by MediaStreamVideoCapturerSource
  19 // for local video capturer. It uses VideoCaptureImplManager to start / stop
  20 // and receive I420 frames from Chrome's video capture implementation.
  21 //
  22 // This is a render thread only object.
  23
  24 class CONTENT_EXPORT VideoCapturerDelegate : public media::VideoCapturerSource {
  25  public:
  26   explicit VideoCapturerDelegate(const StreamDeviceInfo& device_info);
  27   ~VideoCapturerDelegate() override;
  28
  29   // VideoCaptureDelegate Implementation.
  30   void GetCurrentSupportedFormats(
  31       int max_requested_width,
  32       int max_requested_height,
  33       double max_requested_frame_rate,
  34       const VideoCaptureDeviceFormatsCB& callback) override;
  35
  36   void StartCapture(
  37       const media::VideoCaptureParams& params,
  38       const VideoCaptureDeliverFrameCB& new_frame_callback,
  39       scoped_refptr<base::SingleThreadTaskRunner> frame_callback_task_runner,
  40       const RunningCallback& running_callback) override;
  41
  42   void StopCapture() override;
  43
  44  private:
  45   FRIEND_TEST_ALL_PREFIXES(MediaStreamVideoCapturerSourceTest, Ended);
  46   friend class MockVideoCapturerDelegate;
  47
  48   void OnStateUpdate(VideoCaptureState state);
  49   void OnDeviceFormatsInUseReceived(const media::VideoCaptureFormats& formats);
  50   void OnDeviceSupportedFormatsEnumerated(
  51       const media::VideoCaptureFormats& formats);
  52
  53   // The id identifies which video capture device is used for this video
  54   // capture session.
  55   const media::VideoCaptureSessionId session_id_;
  56   base::Closure release_device_cb_;
  57   base::Closure stop_capture_cb_;
  58
  59   const bool is_screen_cast_;
  60
  61   // |running_callback| is provided to this class in StartCapture and must be
  62   // valid until StopCapture is called.
  63   RunningCallback running_callback_;
  64
  65   VideoCaptureDeviceFormatsCB source_formats_callback_;
  66
  67   // Bound to the render thread.
  68   base::ThreadChecker thread_checker_;
  69
  70   base::WeakPtrFactory<VideoCapturerDelegate> weak_factory_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(VideoCapturerDelegate);
  73 };
  74
  75 // Owned by WebMediaStreamSource in Blink as a representation of a video
  76 // stream coming from a camera.
  77 // This is a render thread only object. All methods must be called on the
  78 // render thread.
  79 class CONTENT_EXPORT MediaStreamVideoCapturerSource
  80     : public MediaStreamVideoSource {
  81  public:
  82   MediaStreamVideoCapturerSource(
  83       const SourceStoppedCallback& stop_callback,
  84       scoped_ptr<media::VideoCapturerSource> delegate);
  85   virtual ~MediaStreamVideoCapturerSource();
  86
  87   void SetDeviceInfo(const StreamDeviceInfo& device_info);
  88
  89  protected:
  90   // Implements MediaStreamVideoSource.
  91   void GetCurrentSupportedFormats(
  92       int max_requested_width,
  93       int max_requested_height,
  94       double max_requested_frame_rate,
  95       const VideoCaptureDeviceFormatsCB& callback) override;
  96
  97   void StartSourceImpl(
  98       const media::VideoCaptureFormat& format,
  99       const blink::WebMediaConstraints& constraints,
 100       const VideoCaptureDeliverFrameCB& frame_callback) override;
 101
 102   void StopSourceImpl() override;
 103
 104  private:
 105   void OnStarted(bool result);
 106   // The delegate that provides video frames.
 107   const scoped_ptr<media::VideoCapturerSource> delegate_;
 108
 109   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoCapturerSource);
 110 };
 111
 112 }  // namespace content
 113
 114 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_