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132 lines
5.3 KiB
132 lines
5.3 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 "AAudioServiceEndpointCapture"
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//#define LOG_NDEBUG 0
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#include <utils/Log.h>
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#include <assert.h>
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#include <map>
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#include <mutex>
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#include <utils/Singleton.h>
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#include "AAudioEndpointManager.h"
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#include "AAudioServiceEndpoint.h"
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#include "core/AudioStreamBuilder.h"
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#include "AAudioServiceEndpoint.h"
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#include "AAudioServiceStreamShared.h"
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#include "AAudioServiceEndpointCapture.h"
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#include "AAudioServiceEndpointShared.h"
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using namespace android; // TODO just import names needed
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using namespace aaudio; // TODO just import names needed
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AAudioServiceEndpointCapture::AAudioServiceEndpointCapture(AAudioService &audioService)
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: mStreamInternalCapture(audioService, true) {
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mStreamInternal = &mStreamInternalCapture;
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}
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AAudioServiceEndpointCapture::~AAudioServiceEndpointCapture() {
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delete mDistributionBuffer;
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}
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aaudio_result_t AAudioServiceEndpointCapture::open(const aaudio::AAudioStreamRequest &request) {
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aaudio_result_t result = AAudioServiceEndpointShared::open(request);
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if (result == AAUDIO_OK) {
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delete mDistributionBuffer;
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int distributionBufferSizeBytes = getStreamInternal()->getFramesPerBurst()
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* getStreamInternal()->getBytesPerFrame();
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mDistributionBuffer = new uint8_t[distributionBufferSizeBytes];
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}
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return result;
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}
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// Read data from the shared MMAP stream and then distribute it to the client streams.
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void *AAudioServiceEndpointCapture::callbackLoop() {
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ALOGD("callbackLoop() entering");
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aaudio_result_t result = AAUDIO_OK;
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int64_t timeoutNanos = getStreamInternal()->calculateReasonableTimeout();
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// result might be a frame count
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while (mCallbackEnabled.load() && getStreamInternal()->isActive() && (result >= 0)) {
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int64_t mmapFramesRead = getStreamInternal()->getFramesRead();
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// Read audio data from stream using a blocking read.
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result = getStreamInternal()->read(mDistributionBuffer, getFramesPerBurst(), timeoutNanos);
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if (result == AAUDIO_ERROR_DISCONNECTED) {
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disconnectRegisteredStreams();
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break;
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} else if (result != getFramesPerBurst()) {
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ALOGW("callbackLoop() read %d / %d",
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result, getFramesPerBurst());
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break;
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}
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// Distribute data to each active stream.
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{ // brackets are for lock_guard
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std::lock_guard <std::mutex> lock(mLockStreams);
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for (const auto& clientStream : mRegisteredStreams) {
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if (clientStream->isRunning() && !clientStream->isSuspended()) {
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int64_t clientFramesWritten = 0;
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sp<AAudioServiceStreamShared> streamShared =
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static_cast<AAudioServiceStreamShared *>(clientStream.get());
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{
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// Lock the AudioFifo to protect against close.
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std::lock_guard <std::mutex> lock(streamShared->getAudioDataQueueLock());
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FifoBuffer *fifo = streamShared->getAudioDataFifoBuffer_l();
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if (fifo != nullptr) {
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// Determine offset between framePosition in client's stream
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// vs the underlying MMAP stream.
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clientFramesWritten = fifo->getWriteCounter();
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// There are two indices that refer to the same frame.
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int64_t positionOffset = mmapFramesRead - clientFramesWritten;
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streamShared->setTimestampPositionOffset(positionOffset);
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// Is the buffer too full to write a burst?
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if (fifo->getEmptyFramesAvailable() <
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getFramesPerBurst()) {
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streamShared->incrementXRunCount();
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} else {
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fifo->write(mDistributionBuffer, getFramesPerBurst());
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}
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clientFramesWritten = fifo->getWriteCounter();
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}
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}
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if (clientFramesWritten > 0) {
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// This timestamp represents the completion of data being written into the
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// client buffer. It is sent to the client and used in the timing model
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// to decide when data will be available to read.
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Timestamp timestamp(clientFramesWritten, AudioClock::getNanoseconds());
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streamShared->markTransferTime(timestamp);
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}
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}
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}
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}
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}
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ALOGD("callbackLoop() exiting");
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return NULL; // TODO review
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}
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