void MediaStreamAudioDestinationHandler::setChannelCount(unsigned long channelCount, ExceptionState& exceptionState)
{
ASSERT(isMainThread());
// Currently the maximum channel count supported for this node is 8,
// which is constrained by m_source (WebAudioCapturereSource). Although
// it has its own safety check for the excessive channels, throwing an
// exception here is useful to developers.
if (channelCount > maxChannelCount()) {
exceptionState.throwDOMException(
IndexSizeError,
ExceptionMessages::indexOutsideRange<unsigned>("channel count",
channelCount,
1,
ExceptionMessages::InclusiveBound,
maxChannelCount(),
ExceptionMessages::InclusiveBound));
return;
}
unsigned long oldChannelCount = this->channelCount();
AudioHandler::setChannelCount(channelCount, exceptionState);
// Update the pipeline with the new channel count only if absolutely
// necessary. This process requires the graph lock.
//
// TODO(hongchan): There might be a data race here since both threads
// have access to m_mixBus.
if (!exceptionState.hadException() && this->channelCount() != oldChannelCount && isInitialized()) {
AbstractAudioContext::AutoLocker locker(context());
m_mixBus = AudioBus::create(channelCount, ProcessingSizeInFrames);
m_source->setAudioFormat(channelCount, context()->sampleRate());
}
}
void DefaultAudioDestinationHandler::setChannelCount(
unsigned long channelCount,
ExceptionState& exceptionState) {
// The channelCount for the input to this node controls the actual number of
// channels we send to the audio hardware. It can only be set depending on the
// maximum number of channels supported by the hardware.
DCHECK(isMainThread());
if (!maxChannelCount() || channelCount > maxChannelCount()) {
exceptionState.throwDOMException(
IndexSizeError,
ExceptionMessages::indexOutsideRange<unsigned>(
"channel count", channelCount, 1, ExceptionMessages::InclusiveBound,
maxChannelCount(), ExceptionMessages::InclusiveBound));
return;
}
unsigned long oldChannelCount = this->channelCount();
AudioHandler::setChannelCount(channelCount, exceptionState);
if (!exceptionState.hadException() &&
this->channelCount() != oldChannelCount && isInitialized()) {
// Re-create destination.
m_destination->stop();
createDestination();
m_destination->start();
}
}
void DefaultAudioDestinationNode::setChannelCount(ContextGraphLock& g, unsigned long channelCount)
{
// The channelCount for the input to this node controls the actual number of channels we
// send to the audio hardware. It can only be set depending on the maximum number of
// channels supported by the hardware.
ASSERT(g.context());
if (!maxChannelCount() || channelCount > maxChannelCount())
{
throw std::invalid_argument("Max channel count invalid");
}
unsigned long oldChannelCount = this->channelCount();
AudioNode::setChannelCount(g, channelCount);
if (this->channelCount() != oldChannelCount && isInitialized())
{
// Re-create destination.
m_destination->stop();
createDestination();
m_destination->start();
}
}
