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Changes to the mono and stereo processes

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- Corrected possible issues in the computation
- Removed an unnecessary copy in the mono process
- Trying to make the processes clearer
This commit is contained in:
Paul Ferrand 2020-02-10 14:16:21 +01:00
parent 35d62280a7
commit 33cc4a6518
1 changed files with 41 additions and 33 deletions
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74
src/sfizz/Voice.cpp
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@ -290,23 +290,23 @@ void sfz::Voice::processMono(AudioSpan<float> buffer) noexcept
auto leftBuffer = buffer.getSpan(0);
auto rightBuffer = buffer.getSpan(1);
auto span1 = tempSpan1.first(numSamples);
auto modulationSpan = tempSpan1.first(numSamples);
// Amplitude envelope
amplitudeEnvelope.getBlock(span1);
applyGain<float>(span1, leftBuffer);
amplitudeEnvelope.getBlock(modulationSpan);
applyGain<float>(modulationSpan, leftBuffer);
// Crossfade envelope
crossfadeEnvelope.getBlock(span1);
applyGain<float>(span1, leftBuffer);
crossfadeEnvelope.getBlock(modulationSpan);
applyGain<float>(modulationSpan, leftBuffer);
// Volume envelope
volumeEnvelope.getBlock(span1);
applyGain<float>(span1, leftBuffer);
volumeEnvelope.getBlock(modulationSpan);
applyGain<float>(modulationSpan, leftBuffer);
// AmpEG envelope
egEnvelope.getBlock(span1);
applyGain<float>(span1, leftBuffer);
egEnvelope.getBlock(modulationSpan);
applyGain<float>(modulationSpan, leftBuffer);
// Filtering and EQ
const float* inputChannel[1] { leftBuffer.data() };
@ -322,59 +322,67 @@ void sfz::Voice::processMono(AudioSpan<float> buffer) noexcept
// Prepare for stereo output
copy<float>(leftBuffer, rightBuffer);
panEnvelope.getBlock(span1);
copy<float>(leftBuffer, rightBuffer);
pan<float>(span1, leftBuffer, rightBuffer);
// Apply panning
panEnvelope.getBlock(modulationSpan);
pan<float>(modulationSpan, leftBuffer, rightBuffer);
}
void sfz::Voice::processStereo(AudioSpan<float> buffer) noexcept
{
const auto numSamples = buffer.getNumFrames();
auto span1 = tempSpan1.first(numSamples);
auto modulationSpan = tempSpan1.first(numSamples);
auto leftBuffer = buffer.getSpan(0);
auto rightBuffer = buffer.getSpan(1);
// Amplitude envelope
amplitudeEnvelope.getBlock(span1);
buffer.applyGain(span1);
amplitudeEnvelope.getBlock(modulationSpan);
buffer.applyGain(modulationSpan);
// Crossfade envelope
crossfadeEnvelope.getBlock(span1);
buffer.applyGain(span1);
crossfadeEnvelope.getBlock(modulationSpan);
buffer.applyGain(modulationSpan);
// Volume envelope
volumeEnvelope.getBlock(span1);
buffer.applyGain(span1);
volumeEnvelope.getBlock(modulationSpan);
buffer.applyGain(modulationSpan);
// AmpEG envelope
egEnvelope.getBlock(span1);
buffer.applyGain(span1);
egEnvelope.getBlock(modulationSpan);
buffer.applyGain(modulationSpan);
// Create mid/side from left/right in the output buffer
copy<float>(rightBuffer, span1);
add<float>(leftBuffer, rightBuffer);
subtract<float>(span1, leftBuffer);
// Add const aliases to be slightly more readable
const auto leftBufferCopy = tempSpan2.first(numSamples);
copy<float>(leftBuffer, leftBufferCopy);
const auto midBuffer = leftBuffer;
add<float>(rightBuffer, midBuffer);
const auto sideBuffer = rightBuffer;
applyGain<float>(-1.0f, sideBuffer);
add<float>(leftBufferCopy, sideBuffer);
applyGain<float>(sqrtTwoInv<float>, midBuffer);
applyGain<float>(sqrtTwoInv<float>, sideBuffer);
// Apply the width process
widthEnvelope.getBlock(span1);
width<float>(span1, midBuffer, sideBuffer);
widthEnvelope.getBlock(modulationSpan);
width<float>(modulationSpan, midBuffer, sideBuffer);
// Copy the mid channel into another span
const auto midBufferRight = tempSpan2.first(numSamples);
copy<float>(midBuffer, midBufferRight);
positionEnvelope.getBlock(span1);
pan<float>(span1, midBuffer, midBufferRight);
const auto midBufferCopy = tempSpan3.first(numSamples);
copy<float>(midBuffer, midBufferCopy);
positionEnvelope.getBlock(modulationSpan);
pan<float>(modulationSpan, midBuffer, midBufferCopy);
// Rebuild left/right
add<float>(sideBuffer, midBuffer);
// Recall that midBuffer and leftBuffer point to the same buffer
add<float>(sideBuffer, leftBuffer);
applyGain(sqrtTwoInv<float>, leftBuffer);
add<float>(midBufferRight, sideBuffer);
// Recall that sideBuffer and rightBuffer point to the same buffer
applyGain<float>(-1.0f, sideBuffer);
add<float>(midBufferCopy, sideBuffer);
applyGain(sqrtTwoInv<float>, rightBuffer);
// Filtering and EQ