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117 lines
4.7 KiB
117 lines
4.7 KiB
/*
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* Copyright (C) 2016 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 "SharedRingBuffer"
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//#define LOG_NDEBUG 0
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#include <utils/Log.h>
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#include <iomanip>
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#include <iostream>
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#include <sys/mman.h>
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#include "binding/RingBufferParcelable.h"
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#include "binding/AudioEndpointParcelable.h"
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#include "SharedRingBuffer.h"
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using namespace android;
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using namespace aaudio;
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SharedRingBuffer::~SharedRingBuffer()
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{
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mFifoBuffer.reset(); // uses mSharedMemory
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if (mSharedMemory != nullptr) {
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munmap(mSharedMemory, mSharedMemorySizeInBytes);
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mSharedMemory = nullptr;
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}
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}
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aaudio_result_t SharedRingBuffer::allocate(fifo_frames_t bytesPerFrame,
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fifo_frames_t capacityInFrames) {
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mCapacityInFrames = capacityInFrames;
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// Create shared memory large enough to hold the data and the read and write counters.
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mDataMemorySizeInBytes = bytesPerFrame * capacityInFrames;
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mSharedMemorySizeInBytes = mDataMemorySizeInBytes + (2 * (sizeof(fifo_counter_t)));
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mFileDescriptor.reset(ashmem_create_region("AAudioSharedRingBuffer", mSharedMemorySizeInBytes));
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if (mFileDescriptor.get() == -1) {
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ALOGE("allocate() ashmem_create_region() failed %d", errno);
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return AAUDIO_ERROR_INTERNAL;
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}
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ALOGV("allocate() mFileDescriptor = %d\n", mFileDescriptor.get());
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int err = ashmem_set_prot_region(mFileDescriptor.get(), PROT_READ|PROT_WRITE); // TODO error handling?
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if (err < 0) {
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ALOGE("allocate() ashmem_set_prot_region() failed %d", errno);
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mFileDescriptor.reset();
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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 memory addresses. Use a temporary pointer to keep the mmap result and update
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// it to `mSharedMemory` only when mmap operate successfully.
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uint8_t* tmpPtr = (uint8_t *) mmap(0, mSharedMemorySizeInBytes,
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PROT_READ|PROT_WRITE,
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MAP_SHARED,
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mFileDescriptor.get(), 0);
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if (tmpPtr == MAP_FAILED) {
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ALOGE("allocate() mmap() failed %d", errno);
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mFileDescriptor.reset();
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return AAUDIO_ERROR_INTERNAL; // TODO convert errno to a better AAUDIO_ERROR;
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}
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mSharedMemory = tmpPtr;
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// Get addresses for our counters and data from the shared memory.
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fifo_counter_t *readCounterAddress =
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(fifo_counter_t *) &mSharedMemory[SHARED_RINGBUFFER_READ_OFFSET];
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fifo_counter_t *writeCounterAddress =
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(fifo_counter_t *) &mSharedMemory[SHARED_RINGBUFFER_WRITE_OFFSET];
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uint8_t *dataAddress = &mSharedMemory[SHARED_RINGBUFFER_DATA_OFFSET];
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mFifoBuffer = std::make_shared<FifoBufferIndirect>(bytesPerFrame, capacityInFrames,
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readCounterAddress, writeCounterAddress, dataAddress);
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return AAUDIO_OK;
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}
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void SharedRingBuffer::fillParcelable(AudioEndpointParcelable &endpointParcelable,
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RingBufferParcelable &ringBufferParcelable) {
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int fdIndex = endpointParcelable.addFileDescriptor(mFileDescriptor, mSharedMemorySizeInBytes);
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ringBufferParcelable.setupMemory(fdIndex,
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SHARED_RINGBUFFER_DATA_OFFSET,
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mDataMemorySizeInBytes,
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SHARED_RINGBUFFER_READ_OFFSET,
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SHARED_RINGBUFFER_WRITE_OFFSET,
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sizeof(fifo_counter_t));
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ringBufferParcelable.setBytesPerFrame(mFifoBuffer->getBytesPerFrame());
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ringBufferParcelable.setFramesPerBurst(1);
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ringBufferParcelable.setCapacityInFrames(mCapacityInFrames);
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}
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double SharedRingBuffer::getFractionalFullness() const {
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int32_t framesAvailable = mFifoBuffer->getFullFramesAvailable();
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int32_t capacity = mFifoBuffer->getBufferCapacityInFrames();
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return framesAvailable / (double) capacity;
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}
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std::string SharedRingBuffer::dump() const {
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std::stringstream result;
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int32_t readCounter = mFifoBuffer->getReadCounter();
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int32_t writeCounter = mFifoBuffer->getWriteCounter();
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result << std::setw(10) << writeCounter;
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result << std::setw(10) << readCounter;
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result << std::setw(8) << (writeCounter - readCounter);
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return result.str();
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}
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