ramping coefs

enginefilteriir.cpp

void EngineFilterIIRBand::setFrequencyCorners(int sampleRate,
                                             double freqCorner1,
                                             double freqCorner2) {
    m_sampleRate = sampleRate;
    memcpy(m_oldCoef, m_coef, MAX_COEFS * sizeof(double));
    m_coef[0] = fid_design_coef(m_coef + 1, 16, "BpBe8", m_sampleRate,
                               freqCorner1, freqCorner2, 0);
    m_doRamping = true;
    //initBuffers();
}

void EngineFilterIIRBand::process(const CSAMPLE* pIn, CSAMPLE* pOutput,
                                 const int iBufferSize) {
    if (m_doRamping) {
        double cross_mix = 0.0;
        double cross_inc = 2.0 / static_cast<double>(iBufferSize);
        double coef[MAX_COEFS];
        memcpy(coef, m_oldCoef, MAX_COEFS * sizeof(double));
        for (int i = 0; i < iBufferSize; i += 2) {
            pOutput[i] = _processBandpass(coef, m_buf1, pIn[i]);
            pOutput[i+1] = _processBandpass(coef, m_buf2, pIn[i+1]);
            for (int i = 0; i < MAX_COEFS; i++) {
                coef[i] = m_oldCoef[i] * (1 - cross_mix) + m_coef[i] * cross_mix;
            }
            cross_mix += cross_inc;
        }
        m_doRamping = false;
    } else {
        for (int i = 0; i < iBufferSize; i += 2) {
            pOutput[i] = _processBandpass(m_coef, m_buf1, pIn[i]);
            pOutput[i+1] = _processBandpass(m_coef, m_buf2, pIn[i+1]);
        }
    }
}