bool OfflineAudioDestinationHandler::renderIfNotSuspended(AudioBus* sourceBus, AudioBus* destinationBus, size_t numberOfFrames)
{
// We don't want denormals slowing down any of the audio processing
// since they can very seriously hurt performance.
// This will take care of all AudioNodes because they all process within this scope.
DenormalDisabler denormalDisabler;
context()->deferredTaskHandler().setAudioThread(currentThread());
if (!context()->isDestinationInitialized()) {
destinationBus->zero();
return false;
}
// Take care pre-render tasks at the beginning of each render quantum. Then
// it will stop the rendering loop if the context needs to be suspended
// at the beginning of the next render quantum.
if (context()->handlePreOfflineRenderTasks()) {
suspendOfflineRendering();
return true;
}
// Prepare the local audio input provider for this render quantum.
if (sourceBus)
m_localAudioInputProvider.set(sourceBus);
ASSERT(numberOfInputs() >= 1);
if (numberOfInputs() < 1) {
destinationBus->zero();
return false;
}
// This will cause the node(s) connected to us to process, which in turn will pull on their input(s),
// all the way backwards through the rendering graph.
AudioBus* renderedBus = input(0).pull(destinationBus, numberOfFrames);
if (!renderedBus) {
destinationBus->zero();
} else if (renderedBus != destinationBus) {
// in-place processing was not possible - so copy
destinationBus->copyFrom(*renderedBus);
}
// Process nodes which need a little extra help because they are not connected to anything, but still need to process.
context()->deferredTaskHandler().processAutomaticPullNodes(numberOfFrames);
// Let the context take care of any business at the end of each render quantum.
context()->handlePostOfflineRenderTasks();
// Advance current sample-frame.
size_t newSampleFrame = m_currentSampleFrame + numberOfFrames;
releaseStore(&m_currentSampleFrame, newSampleFrame);
return false;
}
bool OfflineAudioDestinationHandler::renderIfNotSuspended(AudioBus* sourceBus, AudioBus* destinationBus, size_t numberOfFrames)
{
// We don't want denormals slowing down any of the audio processing
// since they can very seriously hurt performance.
// This will take care of all AudioNodes because they all process within this scope.
DenormalDisabler denormalDisabler;
// Need to check if the context actually alive. Otherwise the subsequent
// steps will fail. If the context is not alive somehow, return immediately
// and do nothing.
//
// TODO(hongchan): because the context can go away while rendering, so this
// check cannot guarantee the safe execution of the following steps.
ASSERT(context());
if (!context())
return false;
context()->deferredTaskHandler().setAudioThread(currentThread());
// If the destination node is not initialized, pass the silence to the final
// audio destination (one step before the FIFO). This check is for the case
// where the destination is in the middle of tearing down process.
if (!isInitialized()) {
destinationBus->zero();
return false;
}
// Take care pre-render tasks at the beginning of each render quantum. Then
// it will stop the rendering loop if the context needs to be suspended
// at the beginning of the next render quantum.
if (context()->handlePreOfflineRenderTasks()) {
suspendOfflineRendering();
return true;
}
// Prepare the local audio input provider for this render quantum.
if (sourceBus)
m_localAudioInputProvider.set(sourceBus);
ASSERT(numberOfInputs() >= 1);
if (numberOfInputs() < 1) {
destinationBus->zero();
return false;
}
// This will cause the node(s) connected to us to process, which in turn will pull on their input(s),
// all the way backwards through the rendering graph.
AudioBus* renderedBus = input(0).pull(destinationBus, numberOfFrames);
if (!renderedBus) {
destinationBus->zero();
} else if (renderedBus != destinationBus) {
// in-place processing was not possible - so copy
destinationBus->copyFrom(*renderedBus);
}
// Process nodes which need a little extra help because they are not connected to anything, but still need to process.
context()->deferredTaskHandler().processAutomaticPullNodes(numberOfFrames);
// Let the context take care of any business at the end of each render quantum.
context()->handlePostOfflineRenderTasks();
// Advance current sample-frame.
size_t newSampleFrame = m_currentSampleFrame + numberOfFrames;
releaseStore(&m_currentSampleFrame, newSampleFrame);
return false;
}
