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 // Windows specific implementation of VideoCaptureDevice. 6 // DirectShow is used for capturing. DirectShow provide its own threads 7 // for capturing. 8 9 #ifndef MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_ 10 #define MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_ 11 12 #include <mfidl.h> 13 #include <mfreadwrite.h> 14 15 #include <vector> 16 17 #include "base/synchronization/lock.h" 18 #include "base/threading/non_thread_safe.h" 19 #include "base/win/scoped_comptr.h" 20 #include "media/base/media_export.h" 21 #include "media/video/capture/video_capture_device.h" 22 23 interface IMFSourceReader; 24 25 namespace media { 26 27 class MFReaderCallback; 28 29 const DWORD kFirstVideoStream = 30 static_cast<DWORD>(MF_SOURCE_READER_FIRST_VIDEO_STREAM); 31 32 class MEDIA_EXPORT VideoCaptureDeviceMFWin 33 : public base::NonThreadSafe, 34 public VideoCaptureDevice { 35 public: 36 static bool FormatFromGuid(const GUID& guid, VideoPixelFormat* format); 37 38 explicit VideoCaptureDeviceMFWin(const Name& device_name); 39 virtual ~VideoCaptureDeviceMFWin(); 40 41 // Opens the device driver for this device. 42 bool Init(const base::win::ScopedComPtr<IMFMediaSource>& source); 43 44 // VideoCaptureDevice implementation. 45 virtual void AllocateAndStart(const VideoCaptureParams& params, 46 scoped_ptr<VideoCaptureDevice::Client> client) 47 OVERRIDE; 48 virtual void StopAndDeAllocate() OVERRIDE; 49 50 // Captured new video data. 51 void OnIncomingCapturedData(const uint8* data, 52 int length, 53 int rotation, 54 const base::TimeTicks& time_stamp); 55 56 private: 57 void OnError(HRESULT hr); 58 59 Name name_; 60 base::win::ScopedComPtr<IMFActivate> device_; 61 scoped_refptr<MFReaderCallback> callback_; 62 63 base::Lock lock_; // Used to guard the below variables. 64 scoped_ptr<VideoCaptureDevice::Client> client_; 65 base::win::ScopedComPtr<IMFSourceReader> reader_; 66 VideoCaptureFormat capture_format_; 67 bool capture_; 68 69 DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceMFWin); 70 }; 71 72 } // namespace media 73 74 #endif // MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_ 75