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// Implementation of a fake VideoCaptureDevice class. Used for testing other
6// video capture classes when no real hardware is available.
7
8#ifndef MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_
9#define MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_
10
11#include <string>
12
13#include "base/atomicops.h"
14#include "base/memory/scoped_ptr.h"
15#include "base/threading/thread.h"
16#include "base/threading/thread_checker.h"
17#include "media/video/capture/video_capture_device.h"
18
19namespace media {
20
21class MEDIA_EXPORT FakeVideoCaptureDevice : public VideoCaptureDevice {
22 public:
23  static const int kFakeCaptureTimeoutMs = 50;
24
25  FakeVideoCaptureDevice();
26  virtual ~FakeVideoCaptureDevice();
27
28  // VideoCaptureDevice implementation.
29  virtual void AllocateAndStart(
30      const VideoCaptureParams& params,
31      scoped_ptr<VideoCaptureDevice::Client> client) OVERRIDE;
32  virtual void StopAndDeAllocate() OVERRIDE;
33
34  // Sets the formats to use sequentially when the device is configured as
35  // variable capture resolution. Works only before AllocateAndStart() or
36  // after StopAndDeallocate().
37  void PopulateVariableFormatsRoster(const VideoCaptureFormats& formats);
38
39 private:
40  // Called on the |capture_thread_| only.
41  void OnAllocateAndStart(const VideoCaptureParams& params,
42                          scoped_ptr<Client> client);
43  void OnStopAndDeAllocate();
44  void OnCaptureTask();
45  void Reallocate();
46
47  // |thread_checker_| is used to check that destructor, AllocateAndStart() and
48  // StopAndDeAllocate() are called in the correct thread that owns the object.
49  base::ThreadChecker thread_checker_;
50
51  base::Thread capture_thread_;
52  // The following members are only used on the |capture_thread_|.
53  scoped_ptr<VideoCaptureDevice::Client> client_;
54  scoped_ptr<uint8[]> fake_frame_;
55  int frame_count_;
56  VideoCaptureFormat capture_format_;
57
58  // When the device is allowed to change resolution, this vector holds the
59  // available ones, used sequentially restarting at the end. These two members
60  // are initialised in PopulateFormatRoster() before |capture_thread_| is
61  // running and are subsequently read-only in that thread.
62  std::vector<VideoCaptureFormat> format_roster_;
63  int format_roster_index_;
64
65  DISALLOW_COPY_AND_ASSIGN(FakeVideoCaptureDevice);
66};
67
68}  // namespace media
69
70#endif  // MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_
71