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Bug 849713 - Part 4: Refactor the logic for borrowing the output buffer from the input buffer; r=roc

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This commit is contained in:
Ehsan Akhgari 2013-03-10 18:38:57 -04:00
parent 231f1bbd52
commit f873b5a8da
1 changed files with 16 additions and 9 deletions
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25
content/media/webaudio/AudioBufferSourceNode.cpp
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@ -68,6 +68,20 @@ public:
mBuffer = aBuffer;
}
void BorrowFromInputBuffer(AudioChunk* aOutput,
uint32_t aChannels,
uintptr_t aBufferOffset)
{
aOutput->mDuration = WEBAUDIO_BLOCK_SIZE;
aOutput->mBuffer = mBuffer;
aOutput->mChannelData.SetLength(aChannels);
for (uint32_t i = 0; i < aChannels; ++i) {
aOutput->mChannelData[i] = mBuffer->GetData(i) + aBufferOffset;
}
aOutput->mVolume = 1.0f;
aOutput->mBufferFormat = AUDIO_FORMAT_FLOAT32;
}
virtual void ProduceAudioBlock(AudioNodeStream* aStream,
const AudioChunk& aInput,
AudioChunk* aOutput,
@ -100,15 +114,8 @@ public:
if (currentPosition >= mStart &&
currentPosition + WEBAUDIO_BLOCK_SIZE <= endTime) {
// Data is entirely within the buffer. Avoid copying it.
aOutput->mDuration = WEBAUDIO_BLOCK_SIZE;
aOutput->mBuffer = mBuffer;
aOutput->mChannelData.SetLength(channels);
for (uint32_t i = 0; i < channels; ++i) {
aOutput->mChannelData[i] =
mBuffer->GetData(i) + uintptr_t(currentPosition - mStart + mOffset);
}
aOutput->mVolume = 1.0f;
aOutput->mBufferFormat = AUDIO_FORMAT_FLOAT32;
BorrowFromInputBuffer(aOutput, channels,
uintptr_t(currentPosition - mStart + mOffset));
return;
}