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 FakeVideoCaptureDeviceType {
  26     USING_OWN_BUFFERS,
  27     USING_OWN_BUFFERS_TRIPLANAR,
  28     USING_CLIENT_BUFFERS,
  29   };
  30
  31   static int FakeCapturePeriodMs() { return kFakeCapturePeriodMs; }
  32
  33   explicit FakeVideoCaptureDevice(FakeVideoCaptureDeviceType device_type);
  34   ~FakeVideoCaptureDevice() override;
  35
  36   // VideoCaptureDevice implementation.
  37   void AllocateAndStart(const VideoCaptureParams& params,
  38                         scoped_ptr<Client> client) override;
  39   void StopAndDeAllocate() override;
  40
  41  private:
  42   static const int kFakeCapturePeriodMs = 50;
  43
  44   void CaptureUsingOwnBuffers(base::TimeTicks expected_execution_time);
  45   void CaptureUsingClientBuffers(VideoCapturePixelFormat pixel_format,
  46                                  VideoPixelStorage pixel_storage,
  47                                  base::TimeTicks expected_execution_time);
  48   void BeepAndScheduleNextCapture(
  49       base::TimeTicks expected_execution_time,
  50       const base::Callback<void(base::TimeTicks)>& next_capture);
  51
  52   // |thread_checker_| is used to check that all methods are called in the
  53   // correct thread that owns the object.
  54   base::ThreadChecker thread_checker_;
  55
  56   const FakeVideoCaptureDeviceType device_type_;
  57
  58   scoped_ptr<VideoCaptureDevice::Client> client_;
  59   // |fake_frame_| is used for capturing on Own Buffers.
  60   scoped_ptr<uint8[]> fake_frame_;
  61   int frame_count_;
  62   VideoCaptureFormat capture_format_;
  63
  64   // FakeVideoCaptureDevice post tasks to itself for frame construction and
  65   // needs to deal with asynchronous StopAndDeallocate().
  66   base::WeakPtrFactory<FakeVideoCaptureDevice> weak_factory_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(FakeVideoCaptureDevice);
  69 };
  70
  71 }  // namespace media
  72
  73 #endif  // MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_