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Merge pull request #9935 from zzmp/fix/audio-initialization

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Fix data race in audio output initialization
This commit is contained in:
Zach Pomerantz 2017-03-21 00:23:28 -04:00 committed by GitHub
commit b6d111369f
2 changed files with 31 additions and 15 deletions
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45
libraries/audio-client/src/AudioClient.cpp
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@ -1513,12 +1513,39 @@ bool AudioClient::switchOutputToAudioDevice(const QAudioDeviceInfo& outputDevice
// setup our general output device for audio-mixer audio
_audioOutput = new QAudioOutput(outputDeviceInfo, _outputFormat, this);
int osDefaultBufferSize = _audioOutput->bufferSize();
int deviceChannelCount = _outputFormat.channelCount();
int deviceFrameSize = (AudioConstants::NETWORK_FRAME_SAMPLES_PER_CHANNEL * deviceChannelCount * _outputFormat.sampleRate()) / _desiredOutputFormat.sampleRate();
int requestedSize = _sessionOutputBufferSizeFrames * deviceFrameSize * AudioConstants::SAMPLE_SIZE;
int frameSize = (AudioConstants::NETWORK_FRAME_SAMPLES_PER_CHANNEL * deviceChannelCount * _outputFormat.sampleRate()) / _desiredOutputFormat.sampleRate();
int requestedSize = _sessionOutputBufferSizeFrames * frameSize * AudioConstants::SAMPLE_SIZE;
_audioOutput->setBufferSize(requestedSize);
// initialize mix buffers on the _audioOutput thread to avoid races
connect(_audioOutput, &QAudioOutput::stateChanged, [&, frameSize, requestedSize](QAudio::State state) {
if (state == QAudio::ActiveState) {
// restrict device callback to _outputPeriod samples
_outputPeriod = (_audioOutput->periodSize() / AudioConstants::SAMPLE_SIZE) * 2;
_outputMixBuffer = new float[_outputPeriod];
_outputScratchBuffer = new int16_t[_outputPeriod];
// size local output mix buffer based on resampled network frame size
_networkPeriod = _localToOutputResampler->getMaxOutput(AudioConstants::NETWORK_FRAME_SAMPLES_STEREO);
_localOutputMixBuffer = new float[_networkPeriod];
int localPeriod = _outputPeriod * 2;
_localInjectorsStream.resizeForFrameSize(localPeriod);
int bufferSize = _audioOutput->bufferSize();
int bufferSamples = bufferSize / AudioConstants::SAMPLE_SIZE;
int bufferFrames = bufferSamples / (float)frameSize;
qCDebug(audioclient) << "frame (samples):" << frameSize;
qCDebug(audioclient) << "buffer (frames):" << bufferFrames;
qCDebug(audioclient) << "buffer (samples):" << bufferSamples;
qCDebug(audioclient) << "buffer (bytes):" << bufferSize;
qCDebug(audioclient) << "requested (bytes):" << requestedSize;
qCDebug(audioclient) << "period (samples):" << _outputPeriod;
qCDebug(audioclient) << "local buffer (samples):" << localPeriod;
disconnect(_audioOutput, &QAudioOutput::stateChanged, 0, 0);
}
});
connect(_audioOutput, &QAudioOutput::notify, this, &AudioClient::outputNotify);
_audioOutputIODevice.start();
@ -1528,18 +1555,6 @@ bool AudioClient::switchOutputToAudioDevice(const QAudioDeviceInfo& outputDevice
_audioOutput->start(&_audioOutputIODevice);
lock.unlock();
int periodSampleSize = _audioOutput->periodSize() / AudioConstants::SAMPLE_SIZE;
// device callback is not restricted to periodSampleSize, so double the mix/scratch buffer sizes
_outputPeriod = periodSampleSize * 2;
_outputMixBuffer = new float[_outputPeriod];
_outputScratchBuffer = new int16_t[_outputPeriod];
_localOutputMixBuffer = new float[_outputPeriod];
_localInjectorsStream.resizeForFrameSize(_outputPeriod * 2);
qCDebug(audioclient) << "Output Buffer capacity in frames: " << _audioOutput->bufferSize() / AudioConstants::SAMPLE_SIZE / (float)deviceFrameSize <<
"requested bytes:" << requestedSize << "actual bytes:" << _audioOutput->bufferSize() <<
"os default:" << osDefaultBufferSize << "period size:" << _audioOutput->periodSize();
// setup a loopback audio output device
_loopbackAudioOutput = new QAudioOutput(outputDeviceInfo, _outputFormat, this);

1
libraries/audio-client/src/AudioClient.h
View file

@ -340,6 +340,7 @@ private:
int16_t _networkScratchBuffer[AudioConstants::NETWORK_FRAME_SAMPLES_AMBISONIC];
// for local audio (used by audio injectors thread)
int _networkPeriod { 0 };
float _localMixBuffer[AudioConstants::NETWORK_FRAME_SAMPLES_STEREO];
int16_t _localScratchBuffer[AudioConstants::NETWORK_FRAME_SAMPLES_AMBISONIC];
float* _localOutputMixBuffer { NULL };