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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_H_
#define CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_H_
#include <memory>
#include "base/memory/ref_counted.h"
#include "base/task/single_thread_task_runner.h"
#include "base/threading/thread.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "content/public/browser/desktop_media_id.h"
#include "media/capture/video/video_capture_device.h"
#include "ui/gfx/native_widget_types.h"
namespace base {
class Thread;
class TickClock;
} // namespace base
namespace webrtc {
class DesktopCapturer;
} // namespace webrtc
namespace content {
// DesktopCaptureDevice implements VideoCaptureDevice for screens and windows.
// It's essentially an adapter between webrtc::DesktopCapturer and
// VideoCaptureDevice, i.e. it employs the third-party WebRTC code to use native
// OS library to capture the screen.
//
// This class is used to perform desktop capture on Windows, Mac, and Linux but
// not on Chrome OS (which uses AuraWindowCaptureMachine instead).
class CONTENT_EXPORT DesktopCaptureDevice : public media::VideoCaptureDevice {
public:
// Creates capturer for the specified |source| and then creates
// DesktopCaptureDevice for it. May return NULL in case of a failure (e.g. if
// requested window was destroyed).
static std::unique_ptr<media::VideoCaptureDevice> Create(
const DesktopMediaID& source);
DesktopCaptureDevice(const DesktopCaptureDevice&) = delete;
DesktopCaptureDevice& operator=(const DesktopCaptureDevice&) = delete;
~DesktopCaptureDevice() override;
// VideoCaptureDevice interface.
void AllocateAndStart(const media::VideoCaptureParams& params,
std::unique_ptr<Client> client) override;
void StopAndDeAllocate() override;
// If currently stopped, starts the refresh frame timer to guarantee a frame
// representing the most up-to-date content will be sent to the consumer in
// the near future. This refresh operation will be canceled if a default
// capture event triggers a frame capture in the meantime, and will result in
// a frame sent to the consumer with a delay of up to one second.
void RequestRefreshFrame() override;
// Set the platform-dependent window id for the notification window.
void SetNotificationWindowId(gfx::NativeViewId window_id);
private:
FRIEND_TEST_ALL_PREFIXES(DesktopCaptureDeviceTest,
RequestRefreshFrameBeforeStart);
FRIEND_TEST_ALL_PREFIXES(DesktopCaptureDeviceTest,
RequestRefreshFrameAfterStop);
friend class DesktopCaptureDeviceTest;
friend class DesktopCaptureDeviceThrottledTest;
friend class DesktopCaptureDeviceRequestRefreshFrameTest;
class Core;
DesktopCaptureDevice(
std::unique_ptr<webrtc::DesktopCapturer> desktop_capturer,
DesktopMediaID::Type type);
// Useful to pass the TestMockTimeTaskRunner and the MockTickClock or any
// other testing entities inheriting the common runner and tick interfaces.
void SetMockTimeForTesting(
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
const base::TickClock* tick_clock);
std::unique_ptr<Core> core_;
// Ensure that the thread is the first object destroyed, as that will ensure
// it is stopped. This helps to guarantee that the thread is stopped before
// any of our objects (which it may be depending on), are destroyed. While the
// thread *should* be stopped by consumers with StopAndDeAllocate, some edge
// cases may mean that there is either not a chance for it to be called, or it
// may have been called but not yet scheduled to run.
base::Thread thread_;
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_H_
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