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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Windows specific implementation of VideoCaptureDevice.
// DirectShow is used for capturing. DirectShow provide its own threads
// for capturing.
#ifndef MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_WIN_H_
#define MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_WIN_H_
// Avoid including strsafe.h via dshow as it will cause build warnings.
#define NO_DSHOW_STRSAFE
#include <dshow.h>
#include <map>
#include <string>
#include "base/threading/non_thread_safe.h"
#include "base/threading/thread.h"
#include "base/win/scoped_comptr.h"
#include "media/video/capture/video_capture_device.h"
#include "media/video/capture/video_capture_types.h"
#include "media/video/capture/win/capability_list_win.h"
#include "media/video/capture/win/sink_filter_win.h"
#include "media/video/capture/win/sink_input_pin_win.h"
namespace media {
// All the methods in the class can only be run on a COM initialized thread.
class VideoCaptureDeviceWin
: public base::NonThreadSafe,
public VideoCaptureDevice,
public SinkFilterObserver {
public:
explicit VideoCaptureDeviceWin(const Name& device_name);
virtual ~VideoCaptureDeviceWin();
// Opens the device driver for this device.
// This function is used by the static VideoCaptureDevice::Create function.
bool Init();
// VideoCaptureDevice implementation.
virtual void AllocateAndStart(const VideoCaptureParams& params,
scoped_ptr<VideoCaptureDevice::Client> client)
OVERRIDE;
virtual void StopAndDeAllocate() OVERRIDE;
static void GetDeviceNames(Names* device_names);
private:
enum InternalState {
kIdle, // The device driver is opened but camera is not in use.
kCapturing, // Video is being captured.
kError // Error accessing HW functions.
// User needs to recover by destroying the object.
};
// Implements SinkFilterObserver.
virtual void FrameReceived(const uint8* buffer, int length);
bool CreateCapabilityMap();
void SetErrorState(const char* reason);
Name device_name_;
InternalState state_;
scoped_ptr<VideoCaptureDevice::Client> client_;
base::win::ScopedComPtr<IBaseFilter> capture_filter_;
base::win::ScopedComPtr<IGraphBuilder> graph_builder_;
base::win::ScopedComPtr<IMediaControl> media_control_;
base::win::ScopedComPtr<IPin> input_sink_pin_;
base::win::ScopedComPtr<IPin> output_capture_pin_;
// Used when using a MJPEG decoder.
base::win::ScopedComPtr<IBaseFilter> mjpg_filter_;
base::win::ScopedComPtr<IPin> input_mjpg_pin_;
base::win::ScopedComPtr<IPin> output_mjpg_pin_;
scoped_refptr<SinkFilter> sink_filter_;
// Map of all capabilities this device support.
CapabilityList capabilities_;
VideoCaptureFormat capture_format_;
DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceWin);
};
} // namespace media
#endif // MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_WIN_H_
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