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
26namespace aaudio {
27
28/**
29 * Proxy for sharing memory between two file descriptors.
30 */
31class SharedMemoryProxy {
32public:
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
43private:
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