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 23 namespace 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. 31 class 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 RTC_DISALLOW_COPY_AND_ASSIGN(SharedMemory); 63 }; 64 65 } // namespace webrtc 66 67 #endif // WEBRTC_MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_ 68 69
