1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef AAUDIO_SHARED_MEMORY_PROXY_H 18 #define AAUDIO_SHARED_MEMORY_PROXY_H 19 20 #include <stdint.h> 21 #include <cutils/ashmem.h> 22 #include <sys/mman.h> 23 24 #include <aaudio/AAudio.h> 25 26 namespace aaudio { 27 28 /** 29 * Proxy for sharing memory between two file descriptors. 30 */ 31 class SharedMemoryProxy { 32 public: 33 SharedMemoryProxy() {} 34 35 ~SharedMemoryProxy(); 36 37 aaudio_result_t open(int fd, int32_t capacityInBytes); 38 39 int getFileDescriptor() const { 40 return mProxyFileDescriptor; 41 } 42 43 private: 44 int mOriginalFileDescriptor = -1; 45 int mProxyFileDescriptor = -1; 46 uint8_t *mOriginalSharedMemory = nullptr; 47 uint8_t *mProxySharedMemory = nullptr; 48 int32_t mSharedMemorySizeInBytes = 0; 49 }; 50 51 } /* namespace aaudio */ 52 53 #endif //AAUDIO_SHARED_MEMORY_PROXY_H 54
