blob: 0501cae14e64d1f90fa15e3cf361f08feb26b9a4 [file] [log] [blame]
* 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.
#include <memory>
#include "webrtc/modules/desktop_capture/desktop_capturer.h"
#include "webrtc/modules/desktop_capture/rgba_color.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 {
// 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);
~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;
// 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;
DesktopCapturer::Callback* callback_ = nullptr;
} // namespace webrtc