Adding VideoCaptureDevice for Mac.

media/video/capture/mac/video_capture_device_mac.h

+// Copyright (c) 2011 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.
+
+// OS X implementaion of VideoCaptureDevice, using QTKit as native capture API.
+
+#ifndef MEDIA_VIDEO_CAPTURE_MAC_VIDEO_CAPTURE_DEVICE_MAC_H_
+#define MEDIA_VIDEO_CAPTURE_MAC_VIDEO_CAPTURE_DEVICE_MAC_H_
+
+#include "media/video/capture/video_capture_device.h"
+
+#include <string>
+
+@class VideoCaptureDeviceMacQTKit;
+
+namespace media {
+
+// Called by Video

[dmac, 2011/10/06 23:36:22]

can we give it a slightly better description?

[mflodman_chromium_OOO, 2011/10/07 13:03:51]

I got interrupted when writing that comment and missed that, sorry...

+class VideoCaptureDeviceMac : public VideoCaptureDevice {
+ public:
+  explicit VideoCaptureDeviceMac(const Name& device_name);
+  virtual ~VideoCaptureDeviceMac();
+
+  // VideoCaptureDevice implementation.
+  virtual void Allocate(int width,

[dmac, 2011/10/06 23:36:22]

Mark the overridden virtuals with OVERRIDE

[mflodman_chromium_OOO, 2011/10/07 13:03:51]

Done.

+                        int height,
+                        int frame_rate,
+                        VideoCaptureDevice::EventHandler* observer);
+  virtual void Start();
+  virtual void Stop();
+  virtual void DeAllocate();
+  virtual const Name& device_name();
+
+  bool Init();
+
+  // Called to deliver captured video frames.
+  int IncomingFrame(void* video_frame, int video_frame_length,
+                    const Capability& frame_info);
+
+ private:
+  void SetErrorState(const std::string& reason);
+
+  // Flag indicating the internal state.
+  enum InternalState {
+    kIdle,
+    kAllocated,
+    kCapturing,
+    kError
+  };
+
+  VideoCaptureDevice::Name device_name_;
+  VideoCaptureDevice::EventHandler* observer_;
+  InternalState state_;
+
+  VideoCaptureDeviceMacQTKit* capture_device_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceMac);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_VIDEO_CAPTURE_MAC_VIDEO_CAPTURE_DEVICE_MAC_H_