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/*
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_DESKTOP_CAPTURE_BLANK_DETECTOR_DESKTOP_CAPTURER_WRAPPER_H_
#define MODULES_DESKTOP_CAPTURE_BLANK_DETECTOR_DESKTOP_CAPTURER_WRAPPER_H_
#include <memory>
#include "modules/desktop_capture/desktop_capture_types.h"
#include "modules/desktop_capture/desktop_capturer.h"
#include "modules/desktop_capture/desktop_frame.h"
#include "modules/desktop_capture/rgba_color.h"
#include "modules/desktop_capture/shared_memory.h"
namespace webrtc {
// A DesktopCapturer wrapper detects the return value of its owned
// DesktopCapturer implementation. If sampled pixels returned by the
// DesktopCapturer implementation all equal to the blank pixel, this wrapper
// returns ERROR_TEMPORARY. If the DesktopCapturer implementation fails for too
// many times, this wrapper returns ERROR_PERMANENT.
class BlankDetectorDesktopCapturerWrapper final
: public DesktopCapturer,
public DesktopCapturer::Callback {
public:
// Creates BlankDetectorDesktopCapturerWrapper. BlankDesktopCapturerWrapper
// takes ownership of `capturer`. The `blank_pixel` is the unmodified color
// returned by the `capturer`.
BlankDetectorDesktopCapturerWrapper(std::unique_ptr<DesktopCapturer> capturer,
RgbaColor blank_pixel,
bool check_per_capture = false);
~BlankDetectorDesktopCapturerWrapper() override;
// DesktopCapturer interface.
void Start(DesktopCapturer::Callback* callback) override;
void SetSharedMemoryFactory(
std::unique_ptr<SharedMemoryFactory> shared_memory_factory) override;
void CaptureFrame() override;
void SetExcludedWindow(WindowId window) override;
bool GetSourceList(SourceList* sources) override;
bool SelectSource(SourceId id) override;
bool FocusOnSelectedSource() override;
bool IsOccluded(const DesktopVector& pos) override;
private:
// DesktopCapturer::Callback interface.
void OnCaptureResult(Result result,
std::unique_ptr<DesktopFrame> frame) override;
bool IsBlankFrame(const DesktopFrame& frame) const;
// Detects whether pixel at (x, y) equals to `blank_pixel_`.
bool IsBlankPixel(const DesktopFrame& frame, int x, int y) const;
const std::unique_ptr<DesktopCapturer> capturer_;
const RgbaColor blank_pixel_;
// Whether a non-blank frame has been received.
bool non_blank_frame_received_ = false;
// Whether the last frame is blank.
bool last_frame_is_blank_ = false;
// Whether current frame is the first frame.
bool is_first_frame_ = true;
// Blank inspection is made per capture instead of once for all
// screens or windows.
bool check_per_capture_ = false;
DesktopCapturer::Callback* callback_ = nullptr;
};
} // namespace webrtc
#endif // MODULES_DESKTOP_CAPTURE_BLANK_DETECTOR_DESKTOP_CAPTURER_WRAPPER_H_
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