Video capture implementation using the Media Foundation API.

media/video/capture/win/video_capture_device_mf_win.h

+// 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_MF_WIN_H_
+#define MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_
+
+#include <mfidl.h>
+#include <mfreadwrite.h>
+
+#include <vector>
+
+#include "base/synchronization/lock.h"
+#include "base/threading/non_thread_safe.h"
+#include "base/win/scoped_comptr.h"
+#include "media/video/capture/video_capture_device.h"
+
+interface IMFSourceReader;
+
+namespace media {
+
+class MFReaderCallback;
+
+class VideoCaptureDeviceMFWin
+    : public base::NonThreadSafe,
+      public VideoCaptureDevice {
+ public:
+  explicit VideoCaptureDeviceMFWin(const Name& device_name);
+  virtual ~VideoCaptureDeviceMFWin();
+
+  // Opens the device driver for this device.
+  // This function is used by the static VideoCaptureDevice::Create function.
+  bool Init();
+
+  // VideoCaptureDevice implementation.
+  virtual void Allocate(int width,
+                        int height,
+                        int frame_rate,
+                        VideoCaptureDevice::EventHandler* observer) OVERRIDE;
+  virtual void Start() OVERRIDE;
+  virtual void Stop() OVERRIDE;
+  virtual void DeAllocate() OVERRIDE;
+  virtual const Name& device_name() OVERRIDE;
+
+  static void GetDeviceNames(Names* device_names);
+
+  // Captured a new video frame.
+  void OnIncomingCapturedFrame(const uint8* data, int length,
+                               const base::Time& time_stamp);
+
+ private:
+  void OnError(HRESULT hr);
+
+  Name name_;
+  base::win::ScopedComPtr<IMFActivate> device_;
+  scoped_refptr<MFReaderCallback> callback_;
+
+  base::Lock lock_;  // Used to guard the below variables.
+  VideoCaptureDevice::EventHandler* observer_;
+  base::win::ScopedComPtr<IMFSourceReader> reader_;
+  bool capture_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceMFWin);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_