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prevent overflow of local injectors buffer

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This commit is contained in:
Zach Pomerantz 2017-05-05 15:42:22 -04:00
parent e882e7b648
commit cdf6c332a6
1 changed files with 16 additions and 16 deletions
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32
libraries/audio-client/src/AudioClient.cpp
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@ -1097,26 +1097,26 @@ void AudioClient::handleRecordedAudioInput(const QByteArray& audio) {
}
void AudioClient::prepareLocalAudioInjectors() {
if (_outputPeriod == 0) {
return;
}
int bufferCapacity = _localInjectorsStream.getSampleCapacity();
if (_localToOutputResampler) {
// avoid overwriting the buffer,
// instead of failing on writes because the buffer is used as a lock-free pipe
bufferCapacity -=
_localToOutputResampler->getMaxOutput(AudioConstants::NETWORK_FRAME_SAMPLES_PER_CHANNEL) *
AudioConstants::STEREO;
bufferCapacity += 1;
}
int samplesNeeded = std::numeric_limits<int>::max();
while (samplesNeeded > 0) {
// lock for every write to avoid locking out the device callback
// this lock is intentional - the buffer is only lock-free in its use in the device callback
// unlock between every write to allow device switching
Lock lock(_localAudioMutex);
// in case of a device switch, consider bufferCapacity volatile across iterations
if (_outputPeriod == 0) {
return;
}
int bufferCapacity = _localInjectorsStream.getSampleCapacity();
if (_localToOutputResampler) {
// avoid overwriting the buffer,
// instead of failing on writes because the buffer is used as a lock-free pipe
bufferCapacity -=
_localToOutputResampler->getMaxOutput(AudioConstants::NETWORK_FRAME_SAMPLES_PER_CHANNEL) *
AudioConstants::STEREO;
bufferCapacity += 1;
}
samplesNeeded = bufferCapacity - _localSamplesAvailable.load(std::memory_order_relaxed);
if (samplesNeeded <= 0) {
break;