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110 lines
4.0 KiB
110 lines
4.0 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 "AAudioService"
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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 <algorithm>
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#include <mutex>
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#include <vector>
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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 "AAudioServiceEndpointPlay.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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#define BURSTS_PER_BUFFER_DEFAULT 2
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AAudioServiceEndpointPlay::AAudioServiceEndpointPlay(AAudioService &audioService)
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: mStreamInternalPlay(audioService, true) {
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}
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AAudioServiceEndpointPlay::~AAudioServiceEndpointPlay() {
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}
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aaudio_result_t AAudioServiceEndpointPlay::open(const AAudioStreamConfiguration& configuration) {
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aaudio_result_t result = AAudioServiceEndpoint::open(configuration);
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if (result == AAUDIO_OK) {
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mMixer.allocate(getStreamInternal()->getSamplesPerFrame(),
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getStreamInternal()->getFramesPerBurst());
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int32_t burstsPerBuffer = AAudioProperty_getMixerBursts();
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if (burstsPerBuffer == 0) {
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mLatencyTuningEnabled = true;
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burstsPerBuffer = BURSTS_PER_BUFFER_DEFAULT;
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}
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int32_t desiredBufferSize = burstsPerBuffer * getStreamInternal()->getFramesPerBurst();
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getStreamInternal()->setBufferSize(desiredBufferSize);
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}
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return result;
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}
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// Mix data from each application stream and write result to the shared MMAP stream.
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void *AAudioServiceEndpointPlay::callbackLoop() {
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int32_t underflowCount = 0;
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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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// Mix data from each active stream.
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mMixer.clear();
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{ // use lock guard
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int index = 0;
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std::lock_guard <std::mutex> lock(mLockStreams);
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for (sp<AAudioServiceStreamShared> sharedStream : mRegisteredStreams) {
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if (sharedStream->isRunning()) {
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FifoBuffer *fifo = sharedStream->getDataFifoBuffer();
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float volume = 1.0; // to match legacy volume
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bool underflowed = mMixer.mix(index, fifo, volume);
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underflowCount += underflowed ? 1 : 0;
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// TODO log underflows in each stream
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sharedStream->markTransferTime(AudioClock::getNanoseconds());
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}
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index++;
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}
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}
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// Write mixer output to stream using a blocking write.
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result = getStreamInternal()->write(mMixer.getOutputBuffer(),
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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("AAudioServiceEndpoint(): callbackLoop() wrote %d / %d",
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result, getFramesPerBurst());
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break;
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}
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}
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ALOGW_IF((underflowCount > 0),
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"AAudioServiceEndpointPlay(): callbackLoop() had %d underflows", underflowCount);
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return NULL; // TODO review
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}
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