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Backed out changeset 151b845b0fa9 (bug 849713 part 5) because it has not been reviewed yet!

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This commit is contained in:
Ehsan Akhgari 2013-03-11 15:31:14 -04:00
parent 767a273945
commit 8034e98ffd
1 changed files with 19 additions and 116 deletions
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99
content/media/webaudio/AudioBufferSourceNode.cpp
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@ -100,17 +100,7 @@ public:
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
return;
}
// Loop until stop() has not been called
TrackTicks endTime = std::min(mStart + mDuration, mStop);
if (mLoop != NotLooping) {
if (mStop != TRACK_TICKS_MAX &&
currentPosition + WEBAUDIO_BLOCK_SIZE >= mStop) {
*aFinished = true;
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
return;
}
} else {
// Don't set *aFinished just because we passed mStop. Maybe someone
// will call stop() again with a different value.
if (currentPosition + WEBAUDIO_BLOCK_SIZE >= mStart + mDuration) {
@ -120,7 +110,6 @@ public:
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
return;
}
}
uint32_t channels = mBuffer->GetChannels();
if (!channels) {
@ -128,9 +117,7 @@ public:
return;
}
// If we're not in loop mode
if (mLoop == NotLooping &&
currentPosition >= mStart &&
if (currentPosition >= mStart &&
currentPosition + WEBAUDIO_BLOCK_SIZE <= endTime) {
// Data is entirely within the buffer. Avoid copying it.
BorrowFromInputBuffer(aOutput, channels,
@ -138,47 +125,8 @@ public:
return;
}
// If we're in the loop mode but have not started looping yet
TrackTicks startLoop = std::min(mStart + mLoopEnd - mOffset, mStop);
if (mLoop == WillLoop &&
currentPosition >= mStart &&
currentPosition + WEBAUDIO_BLOCK_SIZE <= startLoop) {
// Data is entirely within the buffer. Avoid copying it.
BorrowFromInputBuffer(aOutput, channels,
uintptr_t(currentPosition - mStart + mOffset));
if (currentPosition + WEBAUDIO_BLOCK_SIZE == startLoop) {
// Move to the first repeat of the loop
mLoop = IsLooping;
}
return;
}
// If we're already looping
int32_t loopLength;
TrackTicks distanceFromLoopStart;
if (mLoop == IsLooping &&
currentPosition + WEBAUDIO_BLOCK_SIZE <= mStop) {
MOZ_ASSERT(currentPosition >= mStart);
loopLength = mLoopEnd - mLoopStart;
TrackTicks intoLoop = currentPosition - mStart + mOffset - mLoopEnd;
distanceFromLoopStart = intoLoop % loopLength;
if (loopLength >= WEBAUDIO_BLOCK_SIZE &&
distanceFromLoopStart + WEBAUDIO_BLOCK_SIZE <= loopLength) {
// Data is entirely within the buffer. Avoid copying it.
BorrowFromInputBuffer(aOutput, channels, mLoopStart + distanceFromLoopStart);
return;
}
}
// Now, handle the case where we're close to the edge of the total output
// buffer, and build the output chunk manually.
AllocateAudioBlock(channels, aOutput);
TrackTicks start = std::max(currentPosition, mStart);
if (mLoop == NotLooping) {
// Not in loop mode
TrackTicks end = std::min(currentPosition + WEBAUDIO_BLOCK_SIZE, endTime);
WriteZeroesToAudioBlock(aOutput, 0, uint32_t(start - currentPosition));
for (uint32_t i = 0; i < channels; ++i) {
@ -190,51 +138,6 @@ public:
}
uint32_t endOffset = uint32_t(end - currentPosition);
WriteZeroesToAudioBlock(aOutput, endOffset, WEBAUDIO_BLOCK_SIZE - endOffset);
} else if (mLoop == WillLoop) {
// In loop mode but not looping yet
TrackTicks end = std::min(currentPosition + WEBAUDIO_BLOCK_SIZE, mStop);
TrackTicks endPreLoop = std::min(currentPosition + WEBAUDIO_BLOCK_SIZE,
std::min(mStart + mLoopEnd, mStop));
WriteZeroesToAudioBlock(aOutput, 0, uint32_t(start - currentPosition));
for (uint32_t i = 0; i < channels; ++i) {
float* baseChannelData = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[i]));
// Copy the chunk before we hit the loop point
memcpy(baseChannelData + uint32_t(start - currentPosition),
mBuffer->GetData(i) + uintptr_t(start - mStart + mOffset),
uint32_t(endPreLoop - start) * sizeof(float));
// Start back from mLoopStart and fill in the rest of the buffer
memcpy(baseChannelData + uint32_t(endPreLoop - currentPosition),
mBuffer->GetData(i) + mLoopStart,
uint32_t(end - endPreLoop) * sizeof(float));
}
uint32_t endOffset = uint32_t(end - currentPosition);
WriteZeroesToAudioBlock(aOutput, endOffset, WEBAUDIO_BLOCK_SIZE - endOffset);
if (currentPosition + WEBAUDIO_BLOCK_SIZE >= startLoop) {
// Move to the first repeat of the loop
mLoop = IsLooping;
}
} else {
// Already looping
MOZ_ASSERT(start == currentPosition);
TrackTicks end = std::min(currentPosition + WEBAUDIO_BLOCK_SIZE, mStop);
TrackTicks endLoop = std::min(currentPosition + loopLength - distanceFromLoopStart, mStop);
MOZ_ASSERT(endLoop < currentPosition + WEBAUDIO_BLOCK_SIZE);
for (uint32_t i = 0; i < channels; ++i) {
float* baseChannelData = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[i]));
// Copy the chunk before we hit the loop point
memcpy(baseChannelData + uint32_t(start - currentPosition),
mBuffer->GetData(i) + uintptr_t(distanceFromLoopStart + mLoopStart),
uint32_t(endLoop - start) * sizeof(float));
// Start back from mLoopStart and fill in the rest of the buffer
memcpy(baseChannelData + uint32_t(endLoop - currentPosition),
mBuffer->GetData(i) + mLoopStart,
uint32_t(end - endLoop) * sizeof(float));
}
uint32_t endOffset = uint32_t(end - currentPosition);
WriteZeroesToAudioBlock(aOutput, endOffset, WEBAUDIO_BLOCK_SIZE - endOffset);
}
}
TrackTicks mStart;