void ResamplingAudioSource::createLowPass (const double frequencyRatio)
{
const double proportionalRate = (frequencyRatio > 1.0) ? 0.5 / frequencyRatio
: 0.5 * frequencyRatio;
const double n = 1.0 / std::tan (double_Pi * jmax (0.001, proportionalRate));
const double nSquared = n * n;
const double c1 = 1.0 / (1.0 + std::sqrt (2.0) * n + nSquared);
setFilterCoefficients (c1,
c1 * 2.0f,
c1,
1.0,
c1 * 2.0 * (1.0 - nSquared),
c1 * (1.0 - std::sqrt (2.0) * n + nSquared));
}
bool setup(BeagleRTContext *context, void *userData)
{
pinModeFrame(context, 0, buttonPin1, INPUT);
pinModeFrame(context, 0, ledPin, OUTPUT);
gNumAudioFramesPerAnalog = context->audioFrames / context->analogFrames;
for (int i = 0; i < NUMBER_OF_READPOINTERS; i++)
{
gDrumBufferForReadPointer[i] = -1;
}
setFilterCoefficients(context->audioSampleRate/2.0, 150.0);
gShouldPlayFill = 0;
return true;
}
