diff options
Diffstat (limited to 'intern/audaspace/FX/AUD_LowpassFactory.cpp')
| -rw-r--r-- | intern/audaspace/FX/AUD_LowpassFactory.cpp | 27 |
1 files changed, 2 insertions, 25 deletions
diff --git a/intern/audaspace/FX/AUD_LowpassFactory.cpp b/intern/audaspace/FX/AUD_LowpassFactory.cpp index e2faa241ac9..bd225998392 100644 --- a/intern/audaspace/FX/AUD_LowpassFactory.cpp +++ b/intern/audaspace/FX/AUD_LowpassFactory.cpp @@ -29,33 +29,10 @@ #include "AUD_LowpassFactory.h" #include "AUD_IIRFilterReader.h" - -#include <cmath> - -#ifndef M_PI -#define M_PI 3.14159265358979323846 -#endif +#include "AUD_LowpassCalculator.h" AUD_LowpassFactory::AUD_LowpassFactory(boost::shared_ptr<AUD_IFactory> factory, float frequency, float Q) : - AUD_DynamicIIRFilterFactory(factory), - m_frequency(frequency), - m_Q(Q) -{ -} - -void AUD_LowpassFactory::recalculateCoefficients(AUD_SampleRate rate, - std::vector<float> &b, - std::vector<float> &a) + AUD_DynamicIIRFilterFactory(factory, boost::shared_ptr<AUD_IDynamicIIRFilterCalculator>(new AUD_LowpassCalculator(frequency, Q))) { - float w0 = 2 * M_PI * m_frequency / rate; - float alpha = sin(w0) / (2 * m_Q); - float norm = 1 + alpha; - float c = cos(w0); - a.push_back(1); - a.push_back(-2 * c / norm); - a.push_back((1 - alpha) / norm); - b.push_back((1 - c) / (2 * norm)); - b.push_back((1 - c) / norm); - b.push_back(b[0]); } |