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