void DspSignal::processDspToIndex(float blockIndex) {
float *outputBuffer = localDspBufferAtOutlet[0];
int startSampleIndex = getStartSampleIndex();
int endSampleIndex = getEndSampleIndex(blockIndex);
if (ArrayArithmetic::hasAccelerate) {
#if __APPLE__
vDSP_vfill(&constant, outputBuffer+startSampleIndex, 1, endSampleIndex-startSampleIndex);
#endif
} else {
for (int i = getStartSampleIndex(); i < endSampleIndex; i++) {
outputBuffer[i] = constant;
}
}
blockIndexOfLastMessage = blockIndex;
}
// http://en.wikipedia.org/wiki/High-pass_filter
void DspHighpassFilter::processDspToIndex(float blockIndex) {
float *inputBuffer = localDspBufferAtInlet[0];
float *outputBuffer = localDspBufferAtOutlet[0];
int startSampleIndex = getStartSampleIndex();
int endSampleIndex = getEndSampleIndex(blockIndex);
if (ArrayArithmetic::hasAccelerate) {
#if __APPLE__
const int duration = endSampleIndex - startSampleIndex;
const int durationBytes = duration * sizeof(float);
memcpy(filterInputBuffer+2, inputBuffer+startSampleIndex, durationBytes);
vDSP_deq22(filterInputBuffer, 1, coefficients, filterOutputBuffer, 1, duration);
memcpy(outputBuffer+startSampleIndex, filterOutputBuffer+2, durationBytes);
memcpy(filterInputBuffer, filterInputBuffer+duration, 2 * sizeof(float));
memcpy(filterOutputBuffer, filterOutputBuffer+duration, 2 * sizeof(float));
#endif
} else {
outputBuffer[startSampleIndex] = alpha * (tapOut + inputBuffer[startSampleIndex] - tapIn);
for (int i = startSampleIndex+1; i < endSampleIndex; i++) {
outputBuffer[i] = alpha * (outputBuffer[i-1] + inputBuffer[i] - inputBuffer[i-1]);
}
tapIn = inputBuffer[endSampleIndex-1];
tapOut = outputBuffer[endSampleIndex-1];
}
blockIndexOfLastMessage = blockIndex;
}
void DspSignal::processDspToIndex(float blockIndex) {
float *outputBuffer = localDspBufferAtOutlet[0];
int endSampleIndex = getEndSampleIndex(blockIndex);
for (int i = getStartSampleIndex(); i < endSampleIndex; i++) {
outputBuffer[i] = constant;
}
blockIndexOfLastMessage = blockIndex;
}
void DspPhasor::processDspToIndex(float blockIndex) {
switch (signalPrecedence) {
case DSP_DSP: {
// TODO(mhroth)
break;
}
case DSP_MESSAGE: {
int endSampleIndex = getEndSampleIndex(blockIndex);
float *inputBuffer = localDspBufferAtInlet[0];
float *outputBuffer = localDspBufferAtOutlet[0];
for (int i = getStartSampleIndex(); i < endSampleIndex; index += inputBuffer[i++]) {
if (index < 0.0f) {
index += sampleRate; // account for negative frequencies
} else if (index >= sampleRate) {
index -= sampleRate;
}
outputBuffer[i] = phasor_table[(int) index];
}
break;
}
case MESSAGE_DSP: {
// TODO(mhroth)
break;
}
case MESSAGE_MESSAGE: {
int endSampleIndex = getEndSampleIndex(blockIndex);
float *outputBuffer = localDspBufferAtOutlet[0];
for (int i = getStartSampleIndex(); i < endSampleIndex; i++, index += frequency) {
if (index < 0.0f) {
index += sampleRate; // account for negative frequencies
} else if (index >= sampleRate) {
index -= sampleRate;
}
outputBuffer[i] = phasor_table[(int) index];
}
break;
}
}
blockIndexOfLastMessage = blockIndex; // update the block index of the last message
}