void MediaStreamAudioSourceNode::process(size_t numberOfFrames)
{
AudioBus* outputBus = output(0)->bus();
if (!audioSourceProvider()) {
outputBus->zero();
return;
}
if (!mediaStream() || m_sourceNumberOfChannels != outputBus->numberOfChannels()) {
outputBus->zero();
return;
}
// Use a tryLock() to avoid contention in the real-time audio thread.
// If we fail to acquire the lock then the MediaStream must be in the middle of
// a format change, so we output silence in this case.
MutexTryLocker tryLocker(m_processLock);
if (tryLocker.locked())
audioSourceProvider()->provideInput(outputBus, numberOfFrames);
else {
// We failed to acquire the lock.
outputBus->zero();
}
}
void MediaStreamAudioSourceNode::process(size_t numberOfFrames)
{
AudioBus* outputBus = output(0)->bus();
if (!audioSourceProvider()) {
outputBus->zero();
return;
}
if (!mediaStream() || m_sourceNumberOfChannels != outputBus->numberOfChannels()) {
outputBus->zero();
return;
}
// Use std::try_to_lock to avoid contention in the real-time audio thread.
// If we fail to acquire the lock then the MediaStream must be in the middle of
// a format change, so we output silence in this case.
std::unique_lock<Lock> lock(m_processMutex, std::try_to_lock);
if (!lock.owns_lock()) {
// We failed to acquire the lock.
outputBus->zero();
return;
}
audioSourceProvider()->provideInput(outputBus, numberOfFrames);
}