void IIRFilter::processSamples (float* const samples, const int numSamples) noexcept
{
const SpinLock::ScopedLockType sl (processLock);
if (active)
{
const float c0 = coefficients.coefficients[0];
const float c1 = coefficients.coefficients[1];
const float c2 = coefficients.coefficients[2];
const float c3 = coefficients.coefficients[3];
const float c4 = coefficients.coefficients[4];
float lv1 = v1, lv2 = v2;
for (int i = 0; i < numSamples; ++i)
{
const float in = samples[i];
const float out = c0 * in + lv1;
samples[i] = out;
lv1 = c1 * in - c3 * out + lv2;
lv2 = c2 * in - c4 * out;
}
JUCE_SNAP_TO_ZERO (lv1); v1 = lv1;
JUCE_SNAP_TO_ZERO (lv2); v2 = lv2;
}
}
void IIRFilter::processSamples (float* const samples,
const int numSamples) noexcept
{
const ScopedLock sl (processLock);
if (active)
{
for (int i = 0; i < numSamples; ++i)
{
const float in = samples[i];
float out = coefficients[0] * in
+ coefficients[1] * x1
+ coefficients[2] * x2
- coefficients[4] * y1
- coefficients[5] * y2;
JUCE_SNAP_TO_ZERO (out);
x2 = x1;
x1 = in;
y2 = y1;
y1 = out;
samples[i] = out;
}
}
}
float IIRFilter::processSingleSampleRaw (const float in) noexcept
{
float out = coefficients.coefficients[0] * in + v1;
JUCE_SNAP_TO_ZERO (out);
v1 = coefficients.coefficients[1] * in - coefficients.coefficients[3] * out + v2;
v2 = coefficients.coefficients[2] * in - coefficients.coefficients[4] * out;
return out;
}
float IIRFilter::processSingleSampleRaw (const float in) noexcept
{
float out = coefficients[0] * in
+ coefficients[1] * x1
+ coefficients[2] * x2
- coefficients[4] * y1
- coefficients[5] * y2;
JUCE_SNAP_TO_ZERO (out);
x2 = x1;
x1 = in;
y2 = y1;
y1 = out;
return out;
}
void IIRFilter::processSamples (float* const samples,
const int numSamples) noexcept
{
const ScopedLock sl (processLock);
if (active)
{
for (int i = 0; i < numSamples; ++i)
{
const float in = samples[i];
float out = coefficients[0] * in + v1;
JUCE_SNAP_TO_ZERO (out);
v1 = coefficients[1] * in - coefficients[4] * out + v2;
v2 = coefficients[2] * in - coefficients[5] * out;
samples[i] = out;
}
}
}
void SmoothIIRFilter::processSamples (float* const samples, const int numSamples) noexcept
{
const SpinLock::ScopedLockType sl (processLock);
if (active)
{
if (!needInterpolation_)
{
const float c0 = coefficients.coefficients[0];
const float c1 = coefficients.coefficients[1];
const float c2 = coefficients.coefficients[2];
const float c3 = coefficients.coefficients[3];
const float c4 = coefficients.coefficients[4];
float lv1 = v1, lv2 = v2;
for (int i = 0; i < numSamples; ++i)
{
const float in = samples[i];
const float out = c0 * in + lv1;
samples[i] = out;
lv1 = c1 * in - c3 * out + lv2;
lv2 = c2 * in - c4 * out;
}
JUCE_SNAP_TO_ZERO (lv1);
v1 = lv1;
JUCE_SNAP_TO_ZERO (lv2);
v2 = lv2;
}
else // do interpolation
{
const float d_c0 = dCoef_[0];
const float d_c1 = dCoef_[1];
const float d_c2 = dCoef_[2];
const float d_c3 = dCoef_[3];
const float d_c4 = dCoef_[4];
float *c0 = &coefficients_.coefficients[0];
float *c1 = &coefficients_.coefficients[1];
float *c2 = &coefficients_.coefficients[2];
float *c3 = &coefficients_.coefficients[3];
float *c4 = &coefficients_.coefficients[4];
float lv1 = v1, lv2 = v2;
for (int i = 0; i < numSamples; ++i)
{
if (needInterpolation_)
{
(*c0) += d_c0;
(*c1) += d_c1;
(*c2) += d_c2;
(*c3) += d_c3;
(*c4) += d_c4;
}
const float in = samples[i];
const float out = (*c0) * in + lv1;
samples[i] = out;
lv1 = (*c1) * in - (*c3) * out + lv2;
lv2 = (*c2) * in - (*c4) * out;
if (++currentInterpolationSample_ >= numInterpolationSamples_)
{
coefficients_ = coefficients;
needInterpolation_ = false;
}
}
JUCE_SNAP_TO_ZERO (lv1);
v1 = lv1;
JUCE_SNAP_TO_ZERO (lv2);
v2 = lv2;
}
}
}
