media/capture/video/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/memory/weak_ptr.h"
  16 #include "base/threading/thread.h"
  17 #include "base/threading/thread_checker.h"
  18 #include "base/time/time.h"
  19 #include "media/capture/video/video_capture_device.h"
  20
  21 namespace media {
  22
  23 class MEDIA_EXPORT FakeVideoCaptureDevice : public VideoCaptureDevice {
  24  public:
  25   enum class BufferOwnership {
  26     OWN_BUFFERS,
  27     CLIENT_BUFFERS,
  28   };
  29
  30   enum class BufferPlanarity {
  31     PACKED,
  32     TRIPLANAR,
  33   };
  34
  35   static int FakeCapturePeriodMs() { return kFakeCapturePeriodMs; }
  36
  37   FakeVideoCaptureDevice(BufferOwnership buffer_ownership,
  38                          BufferPlanarity planarity);
  39   ~FakeVideoCaptureDevice() override;
  40
  41   // VideoCaptureDevice implementation.
  42   void AllocateAndStart(const VideoCaptureParams& params,
  43                         scoped_ptr<Client> client) override;
  44   void StopAndDeAllocate() override;
  45
  46  private:
  47   static const int kFakeCapturePeriodMs = 50;
  48
  49   void CaptureUsingOwnBuffers(base::TimeTicks expected_execution_time);
  50   void CaptureUsingClientBuffers(base::TimeTicks expected_execution_time);
  51   void BeepAndScheduleNextCapture(
  52       base::TimeTicks expected_execution_time,
  53       const base::Callback<void(base::TimeTicks)>& next_capture);
  54
  55   // |thread_checker_| is used to check that all methods are called in the
  56   // correct thread that owns the object.
  57   base::ThreadChecker thread_checker_;
  58
  59   const BufferOwnership buffer_ownership_;
  60   const BufferPlanarity planarity_;
  61
  62   scoped_ptr<VideoCaptureDevice::Client> client_;
  63   // |fake_frame_| is used for capturing on Own Buffers.
  64   scoped_ptr<uint8[]> fake_frame_;
  65   int frame_count_;
  66   VideoCaptureFormat capture_format_;
  67
  68   // FakeVideoCaptureDevice post tasks to itself for frame construction and
  69   // needs to deal with asynchronous StopAndDeallocate().
  70   base::WeakPtrFactory<FakeVideoCaptureDevice> weak_factory_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(FakeVideoCaptureDevice);
  73 };
  74
  75 }  // namespace media
  76
  77 #endif  // MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_