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87 lines
3.1 KiB
87 lines
3.1 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "SharedMemoryProxy"
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//#define LOG_NDEBUG 0
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#include <log/log.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <aaudio/AAudio.h>
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#include "SharedMemoryProxy.h"
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using namespace aaudio;
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SharedMemoryProxy::~SharedMemoryProxy()
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{
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if (mOriginalSharedMemory != nullptr) {
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munmap(mOriginalSharedMemory, mSharedMemorySizeInBytes);
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mOriginalSharedMemory = nullptr;
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}
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if (mProxySharedMemory != nullptr) {
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munmap(mProxySharedMemory, mSharedMemorySizeInBytes);
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close(mProxyFileDescriptor);
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mProxySharedMemory = nullptr;
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}
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}
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aaudio_result_t SharedMemoryProxy::open(int originalFD, int32_t capacityInBytes) {
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mOriginalFileDescriptor = originalFD;
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mSharedMemorySizeInBytes = capacityInBytes;
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mProxyFileDescriptor = ashmem_create_region("AAudioProxyDataBuffer", mSharedMemorySizeInBytes);
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if (mProxyFileDescriptor < 0) {
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ALOGE("open() ashmem_create_region() failed %d", errno);
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return AAUDIO_ERROR_INTERNAL;
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}
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int err = ashmem_set_prot_region(mProxyFileDescriptor, PROT_READ|PROT_WRITE);
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if (err < 0) {
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ALOGE("open() ashmem_set_prot_region() failed %d", errno);
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close(mProxyFileDescriptor);
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mProxyFileDescriptor = -1;
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return AAUDIO_ERROR_INTERNAL; // TODO convert errno to a better AAUDIO_ERROR;
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}
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// Get original memory address.
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mOriginalSharedMemory = (uint8_t *) mmap(0, mSharedMemorySizeInBytes,
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PROT_READ|PROT_WRITE,
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MAP_SHARED,
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mOriginalFileDescriptor, 0);
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if (mOriginalSharedMemory == MAP_FAILED) {
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ALOGE("open() original mmap(%d) failed %d (%s)",
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mOriginalFileDescriptor, errno, strerror(errno));
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return AAUDIO_ERROR_INTERNAL; // TODO convert errno to a better AAUDIO_ERROR;
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}
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// Map the fd to the same memory addresses.
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mProxySharedMemory = (uint8_t *) mmap(mOriginalSharedMemory, mSharedMemorySizeInBytes,
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PROT_READ|PROT_WRITE,
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MAP_SHARED,
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mProxyFileDescriptor, 0);
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if (mProxySharedMemory != mOriginalSharedMemory) {
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ALOGE("open() proxy mmap(%d) failed %d", mProxyFileDescriptor, errno);
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munmap(mOriginalSharedMemory, mSharedMemorySizeInBytes);
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mOriginalSharedMemory = nullptr;
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close(mProxyFileDescriptor);
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mProxyFileDescriptor = -1;
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return AAUDIO_ERROR_INTERNAL; // TODO convert errno to a better AAUDIO_ERROR;
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}
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return AAUDIO_OK;
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}
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