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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_LINUX_PIPEWIRE_DESKTOP_CAPTURER_H_
#define REMOTING_HOST_LINUX_PIPEWIRE_DESKTOP_CAPTURER_H_
#include <cstdint>
#include <memory>
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/task/sequenced_task_runner.h"
#include "remoting/host/linux/pipewire_capture_stream.h"
#include "remoting/protocol/desktop_capturer.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
namespace remoting {
// DesktopCapturer implementation that allows capturing a single screen via the
// provided PipewireCaptureStream.
class PipewireDesktopCapturer : public DesktopCapturer {
public:
explicit PipewireDesktopCapturer(base::WeakPtr<PipewireCaptureStream> stream);
PipewireDesktopCapturer(const PipewireDesktopCapturer&) = delete;
PipewireDesktopCapturer& operator=(const PipewireDesktopCapturer&) = delete;
~PipewireDesktopCapturer() override;
// DesktopCapturer interface.
bool SupportsFrameCallbacks() override;
void Start(Callback* callback) override;
void CaptureFrame() override;
void SetMaxFrameRate(std::uint32_t max_frame_rate) override;
// Unimplemented DesktopCapturer methods that should not be called. Rather,
// the appropriate PipewireCaptureStream is provided to the constructor by the
// DesktopInteractionStrategy based on the screen ID passed to
// DesktopInteractionStrategy::CreateVideoCapturer().
bool GetSourceList(SourceList* sources) override;
bool SelectSource(SourceId id) override;
private:
// SharedScreencastStream runs the pipewire loop, and invokes frame callbacks,
// on a separate thread. This class is responsible for bouncing them back to
// the capture thread.
class CallbackProxy : public Callback {
public:
CallbackProxy(scoped_refptr<base::SequencedTaskRunner> capture_sequence,
base::WeakPtr<PipewireDesktopCapturer> capturer);
~CallbackProxy() override;
// Callback interface
void OnFrameCaptureStart() override;
void OnCaptureResult(Result result,
std::unique_ptr<webrtc::DesktopFrame> frame) override;
private:
scoped_refptr<base::SequencedTaskRunner> capture_sequence_;
base::WeakPtr<PipewireDesktopCapturer> capturer_;
};
// Invoke the corresponding method on callback_.
void OnFrameCaptureStart();
void OnCaptureResult(Result result,
std::unique_ptr<webrtc::DesktopFrame> frame);
scoped_refptr<base::SequencedTaskRunner> creating_sequence_ =
base::SequencedTaskRunner::GetCurrentDefault();
scoped_refptr<base::SequencedTaskRunner> capture_sequence_;
// Must only be tested for validity and dereferenced on the creating sequence.
base::WeakPtr<PipewireCaptureStream> stream_;
// Per the webrtc::DesktopCapturer interface, callback is required to remain
// valid until this is destroyed.
raw_ptr<Callback> callback_;
std::unique_ptr<CallbackProxy> callback_proxy_;
// Will be bound to the capture sequence when Start() is called and used by
// tasks posted by CallbackProxy.
base::WeakPtrFactory<PipewireDesktopCapturer> weak_ptr_factory_{this};
};
} // namespace remoting
#endif // REMOTING_HOST_LINUX_PIPEWIRE_DESKTOP_CAPTURER_H_
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