diff options
Diffstat (limited to 'intern/audaspace/FX/AUD_LowpassFactory.cpp')
| -rw-r--r-- | intern/audaspace/FX/AUD_LowpassFactory.cpp | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/intern/audaspace/FX/AUD_LowpassFactory.cpp b/intern/audaspace/FX/AUD_LowpassFactory.cpp index d24a04b5a94..3ef25c3c16e 100644 --- a/intern/audaspace/FX/AUD_LowpassFactory.cpp +++ b/intern/audaspace/FX/AUD_LowpassFactory.cpp @@ -38,30 +38,26 @@ #define M_PI 3.14159265358979323846 #endif -AUD_LowpassFactory::AUD_LowpassFactory(AUD_IFactory* factory, float frequency, +AUD_LowpassFactory::AUD_LowpassFactory(AUD_Reference<AUD_IFactory> factory, float frequency, float Q) : - AUD_EffectFactory(factory), + AUD_DynamicIIRFilterFactory(factory), m_frequency(frequency), m_Q(Q) { } -AUD_IReader* AUD_LowpassFactory::createReader() const +void AUD_LowpassFactory::recalculateCoefficients(AUD_SampleRate rate, + std::vector<float> &b, + std::vector<float> &a) { - AUD_IReader* reader = getReader(); - - // calculate coefficients - float w0 = 2 * M_PI * m_frequency / reader->getSpecs().rate; + float w0 = 2 * M_PI * m_frequency / rate; float alpha = sin(w0) / (2 * m_Q); float norm = 1 + alpha; float c = cos(w0); - std::vector<float> a, b; 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]); - - return new AUD_IIRFilterReader(reader, b, a); } |