void
AnalyserNode::AppendChunk(const AudioChunk& aChunk)
{
const uint32_t bufferSize = mBuffer.Length();
const uint32_t channelCount = aChunk.mChannelData.Length();
uint32_t chunkDuration = aChunk.mDuration;
MOZ_ASSERT((bufferSize & (bufferSize - 1)) == 0); // Must be a power of two!
MOZ_ASSERT(channelCount > 0);
MOZ_ASSERT(chunkDuration == WEBAUDIO_BLOCK_SIZE);
if (chunkDuration > bufferSize) {
// Copy a maximum bufferSize samples.
chunkDuration = bufferSize;
}
PodCopy(mBuffer.Elements() + mWriteIndex, static_cast<const float*>(aChunk.mChannelData[0]), chunkDuration);
for (uint32_t i = 1; i < channelCount; ++i) {
AudioBlockAddChannelWithScale(static_cast<const float*>(aChunk.mChannelData[i]), 1.0f,
mBuffer.Elements() + mWriteIndex);
}
if (channelCount > 1) {
AudioBlockInPlaceScale(mBuffer.Elements() + mWriteIndex,
1.0f / aChunk.mChannelData.Length());
}
mWriteIndex += chunkDuration;
MOZ_ASSERT(mWriteIndex <= bufferSize);
if (mWriteIndex >= bufferSize) {
mWriteIndex = 0;
}
}
void
PannerNodeEngine::DistanceAndConeGain(AudioChunk* aChunk, float aGain)
{
float* samples = static_cast<float*>(const_cast<void*>(*aChunk->mChannelData.Elements()));
uint32_t channelCount = aChunk->mChannelData.Length();
AudioBlockInPlaceScale(samples, channelCount, aGain);
}
