ThreadSharedFloatArrayBufferList*
AudioBuffer::GetThreadSharedChannelsForRate(JSContext* aJSContext)
{
if (!mSharedChannels) {
// Steal JS data
mSharedChannels =
StealJSArrayDataIntoThreadSharedFloatArrayBufferList(aJSContext, mJSChannels);
}
return mSharedChannels;
}
ThreadSharedFloatArrayBufferList*
AudioBuffer::GetThreadSharedChannelsForRate(JSContext* aJSContext)
{
if (!mSharedChannels) {
for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
if (mLength != JS_GetTypedArrayLength(mJSChannels[i])) {
// Probably one of the arrays was neutered
return nullptr;
}
}
mSharedChannels =
StealJSArrayDataIntoThreadSharedFloatArrayBufferList(aJSContext, mJSChannels);
}
return mSharedChannels;
}
ThreadSharedFloatArrayBufferList*
AudioBuffer::GetThreadSharedChannelsForRate(JSContext* aJSContext, uint32_t aRate,
uint32_t* aLength)
{
if (mResampledChannels && mResampledChannelsRate == aRate) {
// return cached data
*aLength = mResampledChannelsLength;
return mResampledChannels;
}
if (!mSharedChannels) {
// Steal JS data
mSharedChannels =
StealJSArrayDataIntoThreadSharedFloatArrayBufferList(aJSContext, mJSChannels);
}
if (mSampleRate == aRate) {
*aLength = mLength;
return mSharedChannels;
}
mResampledChannels = new ThreadSharedFloatArrayBufferList(NumberOfChannels());
double newLengthD = ceil(Duration()*aRate);
uint32_t newLength = uint32_t(newLengthD);
*aLength = newLength;
double size = sizeof(float)*NumberOfChannels()*newLengthD;
if (size != uint32_t(size)) {
return mResampledChannels;
}
float* outputData = static_cast<float*>(malloc(uint32_t(size)));
if (!outputData) {
nsCOMPtr<nsPIDOMWindow> pWindow = do_QueryInterface(mContext->GetParentObject());
nsIDocument* doc = nullptr;
if (pWindow) {
doc = pWindow->GetExtantDoc();
}
nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
"Media",
doc,
nsContentUtils::eDOM_PROPERTIES,
"MediaBufferSourceNodeResampleOutOfMemory");
return mResampledChannels;
}
SpeexResamplerState* resampler = speex_resampler_init(NumberOfChannels(),
mSampleRate,
aRate,
SPEEX_RESAMPLER_QUALITY_DEFAULT,
nullptr);
for (uint32_t i = 0; i < NumberOfChannels(); ++i) {
const float* inputData = mSharedChannels->GetData(i);
uint32_t inSamples = mLength;
uint32_t outSamples = newLength;
speex_resampler_process_float(resampler, i,
inputData, &inSamples,
outputData, &outSamples);
mResampledChannels->SetData(i, i == 0 ? outputData : nullptr, outputData);
outputData += newLength;
}
speex_resampler_destroy(resampler);
mResampledChannelsRate = aRate;
mResampledChannelsLength = newLength;
return mResampledChannels;
}