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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Implementation of a fake VideoCaptureDevice class. Used for testing other
// video capture classes when no real hardware is available.
#ifndef MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_
#define MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_
#include <string>
#include "base/atomicops.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/thread.h"
#include "base/threading/thread_checker.h"
#include "media/video/capture/video_capture_device.h"
namespace media {
class MEDIA_EXPORT FakeVideoCaptureDevice : public VideoCaptureDevice {
public:
static VideoCaptureDevice* Create(const Name& device_name);
virtual ~FakeVideoCaptureDevice();
// Used for testing. This will make sure the next call to Create will
// return NULL;
static void SetFailNextCreate();
static void SetNumberOfFakeDevices(size_t number_of_devices);
static void GetDeviceNames(Names* device_names);
static void GetDeviceSupportedFormats(const Name& device,
VideoCaptureCapabilities* formats);
// VideoCaptureDevice implementation.
virtual void AllocateAndStart(const VideoCaptureParams& params,
scoped_ptr<VideoCaptureDevice::Client> client)
OVERRIDE;
virtual void StopAndDeAllocate() OVERRIDE;
private:
FakeVideoCaptureDevice();
// Called on the |capture_thread_| only.
void OnAllocateAndStart(const VideoCaptureParams& params,
scoped_ptr<Client> client);
void OnStopAndDeAllocate();
void OnCaptureTask();
void Reallocate();
void PopulateFormatRoster();
// |thread_checker_| is used to check that destructor, AllocateAndStart() and
// StopAndDeAllocate() are called in the correct thread that owns the object.
base::ThreadChecker thread_checker_;
base::Thread capture_thread_;
// The following members are only used on the |capture_thread_|.
scoped_ptr<VideoCaptureDevice::Client> client_;
scoped_ptr<uint8[]> fake_frame_;
int frame_count_;
VideoCaptureFormat capture_format_;
// When the device is allowed to change resolution, this vector holds the
// available ones which are used in sequence, restarting at the end. These
// two members belong to and are only used in |capture_thread_|.
std::vector<VideoCaptureFormat> format_roster_;
int format_roster_index_;
static bool fail_next_create_;
// |number_of_devices_| is atomic since tests can call SetNumberOfFakeDevices
// on the IO thread to set |number_of_devices_|. The variable can be
// read from a separate thread.
// TODO(perkj): Make tests independent of global state. crbug/323913
static base::subtle::Atomic32 number_of_devices_;
DISALLOW_COPY_AND_ASSIGN(FakeVideoCaptureDevice);
};
} // namespace media
#endif // MEDIA_VIDEO_CAPTURE_FAKE_VIDEO_CAPTURE_DEVICE_H_
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