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.
5 // Windows specific implementation of VideoCaptureDevice.
6 // DirectShow is used for capturing. DirectShow provide its own threads
9 #ifndef MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_WIN_H_
10 #define MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_WIN_H_
12 // Avoid including strsafe.h via dshow as it will cause build warnings.
13 #define NO_DSHOW_STRSAFE
19 #include "base/threading/non_thread_safe.h"
20 #include "base/threading/thread.h"
21 #include "base/win/scoped_comptr.h"
22 #include "media/video/capture/video_capture_device.h"
23 #include "media/video/capture/video_capture_types.h"
24 #include "media/video/capture/win/capability_list_win.h"
25 #include "media/video/capture/win/sink_filter_win.h"
26 #include "media/video/capture/win/sink_input_pin_win.h"
30 // All the methods in the class can only be run on a COM initialized thread.
31 class VideoCaptureDeviceWin
32 : public base::NonThreadSafe,
33 public VideoCaptureDevice,
34 public SinkFilterObserver {
36 explicit VideoCaptureDeviceWin(const Name& device_name);
37 virtual ~VideoCaptureDeviceWin();
38 // Opens the device driver for this device.
39 // This function is used by the static VideoCaptureDevice::Create function.
42 // VideoCaptureDevice implementation.
43 virtual void AllocateAndStart(
44 const VideoCaptureParams& params,
45 scoped_ptr<VideoCaptureDevice::Client> client) OVERRIDE;
46 virtual void StopAndDeAllocate() OVERRIDE;
48 static void GetDeviceNames(Names* device_names);
49 static void GetDeviceSupportedFormats(const Name& device,
50 VideoCaptureFormats* formats);
54 kIdle, // The device driver is opened but camera is not in use.
55 kCapturing, // Video is being captured.
56 kError // Error accessing HW functions.
57 // User needs to recover by destroying the object.
60 // Implements SinkFilterObserver.
61 virtual void FrameReceived(const uint8* buffer, int length);
63 bool CreateCapabilityMap();
64 void SetAntiFlickerInCaptureFilter();
65 void SetErrorState(const std::string& reason);
69 scoped_ptr<VideoCaptureDevice::Client> client_;
71 base::win::ScopedComPtr<IBaseFilter> capture_filter_;
72 base::win::ScopedComPtr<IGraphBuilder> graph_builder_;
73 base::win::ScopedComPtr<IMediaControl> media_control_;
74 base::win::ScopedComPtr<IPin> input_sink_pin_;
75 base::win::ScopedComPtr<IPin> output_capture_pin_;
76 // Used when using a MJPEG decoder.
77 base::win::ScopedComPtr<IBaseFilter> mjpg_filter_;
78 base::win::ScopedComPtr<IPin> input_mjpg_pin_;
79 base::win::ScopedComPtr<IPin> output_mjpg_pin_;
81 scoped_refptr<SinkFilter> sink_filter_;
83 // Map of all capabilities this device support.
84 CapabilityList capabilities_;
85 VideoCaptureFormat capture_format_;
87 DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceWin);
92 #endif // MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_WIN_H_