media/video/capture/fake_video_capture_device.h

   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
  19 namespace media {
  20
  21 class MEDIA_EXPORT FakeVideoCaptureDevice : public VideoCaptureDevice {
  22  public:
  23   static const int kFakeCaptureTimeoutMs = 50;
  24
  25   FakeVideoCaptureDevice();
  26   ~FakeVideoCaptureDevice() override;
  27
  28   // VideoCaptureDevice implementation.
  29   void AllocateAndStart(const VideoCaptureParams& params,
  30                         scoped_ptr<VideoCaptureDevice::Client> client) override;
  31   void StopAndDeAllocate() override;
  32
  33   // Sets the formats to use sequentially when the device is configured as
  34   // variable capture resolution. Works only before AllocateAndStart() or
  35   // after StopAndDeallocate().
  36   void PopulateVariableFormatsRoster(const VideoCaptureFormats& formats);
  37
  38  private:
  39   // Called on the |capture_thread_| only.
  40   void OnAllocateAndStart(const VideoCaptureParams& params,
  41                           scoped_ptr<Client> client);
  42   void OnStopAndDeAllocate();
  43   void OnCaptureTask();
  44   void Reallocate();
  45
  46   // |thread_checker_| is used to check that destructor, AllocateAndStart() and
  47   // StopAndDeAllocate() are called in the correct thread that owns the object.
  48   base::ThreadChecker thread_checker_;
  49
  50   base::Thread capture_thread_;
  51   // The following members are only used on the |capture_thread_|.
  52   scoped_ptr<VideoCaptureDevice::Client> client_;
  53   scoped_ptr<uint8[]> fake_frame_;
  54   int frame_count_;
  55   VideoCaptureFormat capture_format_;
  56
  57   // When the device is allowed to change resolution, this vector holds the
  58   // available ones, used sequentially restarting at the end. These two members
  59   // are initialised in PopulateFormatRoster() before |capture_thread_| is
  60   // running and are subsequently read-only in that thread.
  61   std::vector<VideoCaptureFormat> format_roster_;
  62   int format_roster_index_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(FakeVideoCaptureDevice);
  65 };
  66
  67 }  // namespace media
  68
  69 #endif  // MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_