ScriptProcessorNode* ScriptProcessorNode::create(AbstractAudioContext& context, float sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels)
{
// Check for valid buffer size.
switch (bufferSize) {
case 0:
bufferSize = chooseBufferSize();
break;
case 256:
case 512:
case 1024:
case 2048:
case 4096:
case 8192:
case 16384:
break;
default:
return nullptr;
}
if (!numberOfInputChannels && !numberOfOutputChannels)
return nullptr;
if (numberOfInputChannels > AbstractAudioContext::maxNumberOfChannels())
return nullptr;
if (numberOfOutputChannels > AbstractAudioContext::maxNumberOfChannels())
return nullptr;
return new ScriptProcessorNode(context, sampleRate, bufferSize, numberOfInputChannels, numberOfOutputChannels);
}
ScriptProcessorNode* ScriptProcessorNode::create(
BaseAudioContext& context,
size_t bufferSize,
unsigned numberOfInputChannels,
unsigned numberOfOutputChannels,
ExceptionState& exceptionState) {
DCHECK(isMainThread());
if (context.isContextClosed()) {
context.throwExceptionForClosedState(exceptionState);
return nullptr;
}
if (numberOfInputChannels == 0 && numberOfOutputChannels == 0) {
exceptionState.throwDOMException(
IndexSizeError,
"number of input channels and output channels cannot both be zero.");
return nullptr;
}
if (numberOfInputChannels > BaseAudioContext::maxNumberOfChannels()) {
exceptionState.throwDOMException(
IndexSizeError,
"number of input channels (" + String::number(numberOfInputChannels) +
") exceeds maximum (" +
String::number(BaseAudioContext::maxNumberOfChannels()) + ").");
return nullptr;
}
if (numberOfOutputChannels > BaseAudioContext::maxNumberOfChannels()) {
exceptionState.throwDOMException(
IndexSizeError,
"number of output channels (" + String::number(numberOfOutputChannels) +
") exceeds maximum (" +
String::number(BaseAudioContext::maxNumberOfChannels()) + ").");
return nullptr;
}
// Check for valid buffer size.
switch (bufferSize) {
case 0:
bufferSize = chooseBufferSize();
break;
case 256:
case 512:
case 1024:
case 2048:
case 4096:
case 8192:
case 16384:
break;
default:
exceptionState.throwDOMException(
IndexSizeError,
"buffer size (" + String::number(bufferSize) +
") must be 0 or a power of two between 256 and 16384.");
return nullptr;
}
ScriptProcessorNode* node =
new ScriptProcessorNode(context, context.sampleRate(), bufferSize,
numberOfInputChannels, numberOfOutputChannels);
if (!node)
return nullptr;
// context keeps reference until we stop making javascript rendering callbacks
context.notifySourceNodeStartedProcessing(node);
return node;
}
