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// Copyright 2024 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_MOJO_VIDEO_CAPTURER_H_
#define REMOTING_HOST_MOJO_VIDEO_CAPTURER_H_
#include <stdint.h>
#include <memory>
#include "base/functional/callback.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "remoting/host/mojom/desktop_session.mojom.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
#include "third_party/webrtc/modules/desktop_capture/mouse_cursor.h"
namespace remoting {
class AutoThreadTaskRunner;
class DesktopCapturer;
class MojoVideoCapturer : public webrtc::DesktopCapturer::Callback,
public mojom::VideoCapturer {
public:
MojoVideoCapturer(std::unique_ptr<DesktopCapturer> capturer,
scoped_refptr<AutoThreadTaskRunner> caller_task_runner);
MojoVideoCapturer(const MojoVideoCapturer&) = delete;
MojoVideoCapturer& operator=(const MojoVideoCapturer&) = delete;
~MojoVideoCapturer() override;
// Notifies the handler if the channel becomes disconnected. The handler may
// delete this object. Must only be called after Start(), which binds the Mojo
// endpoints.
void SetDisconnectHandler(base::OnceClosure handler);
// Starts the capturer, creating new Mojo endpoints to return to the network
// process.
mojom::CreateVideoCapturerResultPtr Start();
// mojom::VideoCapturer implementation.
void CaptureFrame() override;
void SetComposeEnabled(bool enabled) override;
void SetMouseCursor(std::unique_ptr<webrtc::MouseCursor> mouse_cursor);
void SetMouseCursorPosition(const webrtc::DesktopVector& position);
// webrtc::DesktopCapturer::Callback implementation.
void OnCaptureResult(webrtc::DesktopCapturer::Result result,
std::unique_ptr<webrtc::DesktopFrame> frame) override;
private:
// Notifies the network process when a new shared memory region is created.
void OnSharedMemoryRegionCreated(int id,
base::ReadOnlySharedMemoryRegion region,
uint32_t size);
// Notifies the network process when a shared memory region is released.
void OnSharedMemoryRegionReleased(int id);
// The real video-capturer wrapped by this class.
std::unique_ptr<DesktopCapturer> video_capturer_;
// Keep reference to the last frame sent to make sure shared buffer is alive
// before it's received.
std::unique_ptr<webrtc::DesktopFrame> last_frame_;
// Endpoint for receiving capturer commands from the network process.
mojo::Receiver<mojom::VideoCapturer> capturer_control_{this};
// Endpoint for sending capturer events to the network process.
mojo::Remote<mojom::VideoCapturerEventHandler> event_handler_;
base::WeakPtr<MojoVideoCapturer> weak_ptr_;
base::WeakPtrFactory<MojoVideoCapturer> weak_factory_{this};
};
} // namespace remoting
#endif // REMOTING_HOST_MOJO_VIDEO_CAPTURER_H_
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