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 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