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/memory/weak_ptr.h"
  16 #include "base/threading/thread.h"
  17 #include "base/threading/thread_checker.h"
  18 #include "media/video/capture/video_capture_device.h"
  19
  20 namespace media {
  21
  22 class MEDIA_EXPORT FakeVideoCaptureDevice : public VideoCaptureDevice {
  23  public:
  24   enum FakeVideoCaptureDeviceType {
  25     USING_OWN_BUFFERS,
  26     USING_OWN_BUFFERS_TRIPLANAR,
  27     USING_CLIENT_BUFFERS_I420,
  28     USING_CLIENT_BUFFERS_GPU,
  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();
  45   void CaptureUsingClientBuffers(VideoPixelFormat pixel_format);
  46   void BeepAndScheduleNextCapture(const base::Closure& next_capture);
  47
  48   // |thread_checker_| is used to check that all methods are called in the
  49   // correct thread that owns the object.
  50   base::ThreadChecker thread_checker_;
  51
  52   const FakeVideoCaptureDeviceType device_type_;
  53
  54   scoped_ptr<VideoCaptureDevice::Client> client_;
  55   // |fake_frame_| is used for capturing on Own Buffers.
  56   scoped_ptr<uint8[]> fake_frame_;
  57   int frame_count_;
  58   VideoCaptureFormat capture_format_;
  59
  60   // FakeVideoCaptureDevice post tasks to itself for frame construction and
  61   // needs to deal with asynchronous StopAndDeallocate().
  62   base::WeakPtrFactory<FakeVideoCaptureDevice> weak_factory_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(FakeVideoCaptureDevice);
  65 };
  66
  67 }  // namespace media
  68
  69 #endif  // MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_