mirror of https://github.com/ShaYmez/xlxd.git
Better FIR Filter implementation, correct sample collecting
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@ -34,7 +34,7 @@ CFIRFilter::CFIRFilter(const float* taps, int tapsLength)
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::memcpy(m_taps, taps, tapsLength * sizeof(float));
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::memset(m_buffer, 0, tapsLength * sizeof(float));
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m_currentBufferPosition = m_tapsLength -1;
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m_currentBufferPosition = 0;
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}
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CFIRFilter::~CFIRFilter()
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@ -45,23 +45,30 @@ CFIRFilter::~CFIRFilter()
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inline float CFIRFilter::Process(float inputSample)
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{
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// Buffer latest sample
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float output = 0.0f;
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int iTaps = 0;
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// Buffer latest sample into delay line
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m_buffer[m_currentBufferPosition] = inputSample;
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float outputSample = 0.0f;
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for(int i = 0; i < m_tapsLength; i++)
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for(int i = m_currentBufferPosition; i >= 0; i--)
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{
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outputSample += m_taps[i] * m_buffer[(m_currentBufferPosition + i) % m_tapsLength];
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output += m_taps[iTaps++] * m_buffer[i];
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}
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m_currentBufferPosition = MAX(0, m_currentBufferPosition - 1);
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for(int i = m_tapsLength - 1; i > m_currentBufferPosition; i--)
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{
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output += m_taps[iTaps++] * m_buffer[i];
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}
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m_currentBufferPosition = (m_currentBufferPosition + 1) % m_tapsLength;
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return outputSample;
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return output;
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}
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void CFIRFilter::Process(uint8* voice, int length)
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{
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for(int i = 0; i < length; i++)
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for(int i = 0; i < length; i+=2)
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{
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//Get the sample
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float input = (float)(short)MAKEWORD(voice[i+1], voice[i]);
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