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/*
==============================================================================
This file is part of the IEM plug-in suite.
Author: Stefan Riedel
Copyright (c) 2022 - Institute of Electronic Music and Acoustics (IEM)
https://iem.at
The IEM plug-in suite is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The IEM plug-in suite is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this software. If not, see <https://www.gnu.org/licenses/>.
==============================================================================
*/
#include "Grain.h"
Grain::Grain()
{
_isActive = false;
_currentIndex = 0;
_blockCounter = 0;
}
void Grain::setBlockSize (int numSampOutBuffer)
{
_outputBuffer.setSize (1, numSampOutBuffer);
_outputBuffer.clear();
}
void Grain::startGrain (const GrainJobParameters& grainParameters) // Type envelopeType)
{
_params = grainParameters;
_isActive = true;
_currentIndex = 0;
_blockCounter = 0;
_outputBuffer.clear();
}
void Grain::processBlock (juce::AudioBuffer<float>& buffer,
juce::AudioBuffer<float>& circularBuffer)
{
if (! _isActive)
return;
int numSampCircBuffer = circularBuffer.getNumSamples();
int numSampOutBuffer = buffer.getNumSamples();
jassert (_outputBuffer.getNumSamples() == numSampOutBuffer);
_outputBuffer.clear();
int nChOut = buffer.getNumChannels();
const float* circularLeftChannel = circularBuffer.getReadPointer (0);
const float* circularRightChannel = circularBuffer.getReadPointer (1);
const float* circularBuffToSeed;
if (_params.seedFromLeftCircBuffer)
circularBuffToSeed = circularLeftChannel;
else
circularBuffToSeed = circularRightChannel;
const float* window_ptr = _params.windowBuffer.getReadPointer (0);
const int windowNumSamples = _params.windowBuffer.getNumSamples();
float* outputBufferWritePtr = _outputBuffer.getWritePointer (0);
int outStart;
if (_blockCounter == 0)
{
outStart = _params.startOffsetInBlock;
}
else
{
outStart = 0;
}
// Write samples to internal mono buffer
for (int i = outStart; i < numSampOutBuffer; i++)
{
if (_currentIndex < _params.grainLengthSamples) // grain still needs samples
{
// Linear interpolation of buffer samples
float readIndex =
_params.startPositionCircBuffer + (_currentIndex * _params.pitchReadFactor);
int readIndexInt = static_cast<int> (readIndex);
int readIndexIntNext = readIndexInt + 1;
float sampleFracWeight = readIndex - readIndexInt;
readIndexInt %= numSampCircBuffer;
readIndexIntNext %= numSampCircBuffer;
float sampleIntPart = circularBuffToSeed[readIndexInt];
float sampleFracPart = circularBuffToSeed[readIndexIntNext] - sampleIntPart;
float sampleValue = sampleIntPart + sampleFracWeight * sampleFracPart;
// Linear interpolation for grain window function
float windowIndex = static_cast<float> (_currentIndex)
/ static_cast<float> (_params.grainLengthSamples)
* (windowNumSamples - 1);
int windowIndexInt = static_cast<int> (windowIndex);
jassert (windowIndexInt >= 0 && windowIndexInt < (windowNumSamples - 1));
int windowIndexIntNext = windowIndexInt + 1;
float windowFracWeight = windowIndex - windowIndexInt;
float windowIntPart = window_ptr[windowIndexInt];
float windFracPart = window_ptr[windowIndexIntNext] - windowIntPart;
float windowValue = windowIntPart + windowFracWeight * windFracPart;
jassert (windowValue >= 0.0f && windowValue <= 1.0f);
outputBufferWritePtr[i] = sampleValue * windowValue;
_currentIndex++;
}
else
{
_isActive = false;
break;
}
}
const float* outputBufferReadPtr = _outputBuffer.getReadPointer (0);
for (int ch = 0; ch < nChOut; ++ch)
{
buffer.addFrom (ch,
0,
outputBufferReadPtr,
buffer.getNumSamples(),
_params.channelWeights[ch] * _params.gainFactor);
}
_blockCounter++;
};
bool Grain::isActive() const
{
return _isActive;
};
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