blank_detector_desktop_capturer_wrapper.h

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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_