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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_FALLBACK_DESKTOP_CAPTURER_WRAPPER_H_
#define MODULES_DESKTOP_CAPTURE_FALLBACK_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/desktop_geometry.h"
#include "modules/desktop_capture/shared_memory.h"
namespace webrtc {
// A DesktopCapturer wrapper owns two DesktopCapturer implementations. If the
// main DesktopCapturer fails, it uses the secondary one instead. Two capturers
// are expected to return same SourceList, and the meaning of each SourceId is
// identical, otherwise FallbackDesktopCapturerWrapper may return frames from
// different sources. Using asynchronized DesktopCapturer implementations with
// SharedMemoryFactory is not supported, and may result crash or assertion
// failure.
class FallbackDesktopCapturerWrapper final : public DesktopCapturer,
public DesktopCapturer::Callback {
public:
FallbackDesktopCapturerWrapper(
std::unique_ptr<DesktopCapturer> main_capturer,
std::unique_ptr<DesktopCapturer> secondary_capturer);
~FallbackDesktopCapturerWrapper() 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;
const std::unique_ptr<DesktopCapturer> main_capturer_;
const std::unique_ptr<DesktopCapturer> secondary_capturer_;
std::unique_ptr<SharedMemoryFactory> shared_memory_factory_;
bool main_capturer_permanent_error_ = false;
DesktopCapturer::Callback* callback_ = nullptr;
};
} // namespace webrtc
#endif // MODULES_DESKTOP_CAPTURE_FALLBACK_DESKTOP_CAPTURER_WRAPPER_H_
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