video_capture_device_mac.h revision d0247b1b59f9c528cb6df88b4f2b9afaf80d181e 
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// OS X implementation of VideoCaptureDevice, using QTKit as native capture API.
6
7#ifndef MEDIA_VIDEO_CAPTURE_MAC_VIDEO_CAPTURE_DEVICE_MAC_H_
8#define MEDIA_VIDEO_CAPTURE_MAC_VIDEO_CAPTURE_DEVICE_MAC_H_
9
10#include <string>
11
12#include "base/compiler_specific.h"
13#include "base/memory/ref_counted.h"
14#include "base/memory/weak_ptr.h"
15#include "base/message_loop/message_loop_proxy.h"
16#include "media/video/capture/video_capture_device.h"
17#include "media/video/capture/video_capture_types.h"
18
19@class VideoCaptureDeviceQTKit;
20
21namespace media {
22
23// Called by VideoCaptureManager to open, close and start, stop video capture
24// devices.
25class VideoCaptureDeviceMac : public VideoCaptureDevice1 {
26 public:
27  explicit VideoCaptureDeviceMac(const Name& device_name);
28  virtual ~VideoCaptureDeviceMac();
29
30  // VideoCaptureDevice implementation.
31  virtual void Allocate(const VideoCaptureCapability& capture_format,
32                         VideoCaptureDevice::EventHandler* observer) OVERRIDE;
33  virtual void Start() OVERRIDE;
34  virtual void Stop() OVERRIDE;
35  virtual void DeAllocate() OVERRIDE;
36  virtual const Name& device_name() OVERRIDE;
37
38  bool Init();
39
40  // Called to deliver captured video frames.
41  void ReceiveFrame(const uint8* video_frame, int video_frame_length,
42                    const VideoCaptureCapability& frame_info);
43
44  void ReceiveError(const std::string& reason);
45
46 private:
47  void SetErrorState(const std::string& reason);
48
49  // Flag indicating the internal state.
50  enum InternalState {
51    kNotInitialized,
52    kIdle,
53    kAllocated,
54    kCapturing,
55    kError
56  };
57
58  Name device_name_;
59  VideoCaptureDevice::EventHandler* observer_;
60
61  // Only read and write state_ from inside this loop.
62  const scoped_refptr<base::MessageLoopProxy> loop_proxy_;
63  InternalState state_;
64
65  // Used with Bind and PostTask to ensure that methods aren't called
66  // after the VideoCaptureDeviceMac is destroyed.
67  base::WeakPtrFactory<VideoCaptureDeviceMac> weak_factory_;
68  base::WeakPtr<VideoCaptureDeviceMac> weak_this_;
69
70  VideoCaptureDeviceQTKit* capture_device_;
71
72  DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceMac);
73};
74
75}  // namespace media
76
77#endif  // MEDIA_VIDEO_CAPTURE_MAC_VIDEO_CAPTURE_DEVICE_MAC_H_
78