chromium/remoting/host/video_memory_utils.h

// 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_VIDEO_MEMORY_UTILS_H_
#define REMOTING_HOST_VIDEO_MEMORY_UTILS_H_

#include <memory>

#include "base/functional/callback.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/ref_counted.h"
#include "base/memory/shared_memory_mapping.h"
#include "third_party/webrtc/modules/desktop_capture/shared_memory.h"

#if BUILDFLAG(IS_WIN)
#include "base/win/scoped_handle.h"
#endif  // BUILDFLAG(IS_WIN)

// Helper classes to implement sharing of captured video frames over an IPC
// channel.
namespace remoting {

// webrtc::SharedMemory implementation that creates a
// base::ReadOnlySharedMemoryRegion along with a writable mapping.
// The writable mapping is used by the real video-capturer in the Desktop
// process, and the read-only region is sent over the IPC channel.
class SharedVideoMemory : public webrtc::SharedMemory { … };

// A webrtc::SharedMemoryFactory implementation which creates
// SharedVideoMemory objects for the real video-capturer in the Desktop
// process. It notifies callbacks when memory is created and released.
class SharedVideoMemoryFactory : public webrtc::SharedMemoryFactory { … };

// A wrapper for read-only memory received over IPC. This creates and stores a
// ReadOnlySharedMemoryMapping for the received memory-region.
class IpcSharedBufferCore
    : public base::RefCountedThreadSafe<IpcSharedBufferCore> { … };

// A webrtc::SharedMemory implementation which wraps an IpcSharedBufferCore.
// This is used for the `shared_memory` field of a webrtc::DesktopFrame in the
// Network process.
class IpcSharedBuffer : public webrtc::SharedMemory { … };

}  // namespace remoting

#endif  // REMOTING_HOST_VIDEO_MEMORY_UTILS_H_