1/* 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11#ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_ 12#define WEBRTC_MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_ 13 14#include <stddef.h> 15 16#if defined(WEBRTC_WIN) 17#include <windows.h> 18#endif 19 20#include "webrtc/base/constructormagic.h" 21#include "webrtc/typedefs.h" 22 23namespace webrtc { 24 25// SharedMemory is a base class for shared memory. It stores all required 26// parameters of the buffer, but doesn't have any logic to allocate or destroy 27// the actual buffer. DesktopCapturer consumers that need to use shared memory 28// for video frames must extend this class with creation and destruction logic 29// specific for the target platform and then implement 30// DesktopCapturer::Delegate::CreateSharedMemory() as appropriate. 31class SharedMemory { 32 public: 33#if defined(WEBRTC_WIN) 34 typedef HANDLE Handle; 35 static const Handle kInvalidHandle; 36#else 37 typedef int Handle; 38 static const Handle kInvalidHandle; 39#endif 40 41 void* data() const { return data_; } 42 size_t size() const { return size_; } 43 44 // Platform-specific handle of the buffer. 45 Handle handle() const { return handle_; } 46 47 // Integer identifier that can be used used by consumers of DesktopCapturer 48 // interface to identify shared memory buffers it created. 49 int id() const { return id_; } 50 51 virtual ~SharedMemory() {} 52 53 protected: 54 SharedMemory(void* data, size_t size, Handle handle, int id); 55 56 void* const data_; 57 const size_t size_; 58 const Handle handle_; 59 const int id_; 60 61 private: 62 DISALLOW_COPY_AND_ASSIGN(SharedMemory); 63}; 64 65} // namespace webrtc 66 67#endif // WEBRTC_MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_ 68 69