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Improve circular buffer

This commit is contained in:
Geoffrey Merck 2020-02-03 22:23:10 +01:00
parent adbea50027
commit 4ba6a77ecc
2 changed files with 5 additions and 5 deletions
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8
ambed/cfirfilter.cpp
View File

@ -34,7 +34,7 @@ CFIRFilter::CFIRFilter(const float* taps, int tapsLength)
::memcpy(m_taps, taps, tapsLength * sizeof(float)); ::memcpy(m_taps, taps, tapsLength * sizeof(float));
::memset(m_buffer, 0, tapsLength * sizeof(float)); ::memset(m_buffer, 0, tapsLength * sizeof(float));
m_currentBufferPostion = 0; m_currentBufferPosition = m_tapsLength -1;
} }
CFIRFilter::~CFIRFilter() CFIRFilter::~CFIRFilter()
@ -46,15 +46,15 @@ CFIRFilter::~CFIRFilter()
inline float CFIRFilter::Process(float inputSample) inline float CFIRFilter::Process(float inputSample)
{ {
// Buffer latest sample // Buffer latest sample
m_buffer[m_currentBufferPostion] = inputSample; m_buffer[m_currentBufferPosition] = inputSample;
float outputSample = 0.0f; float outputSample = 0.0f;
for(int i = 0; i < m_tapsLength; i++) for(int i = 0; i < m_tapsLength; i++)
{ {
outputSample += m_taps[i] * m_buffer[(m_currentBufferPostion + i) % m_tapsLength]; outputSample += m_taps[i] * m_buffer[(m_currentBufferPosition + i) % m_tapsLength];
} }
m_currentBufferPostion = (m_currentBufferPostion + 1) % m_tapsLength; m_currentBufferPosition = MAX(0, m_currentBufferPosition - 1);
return outputSample; return outputSample;
} }

2
ambed/cfirfilter.h
View File

@ -45,7 +45,7 @@ private:
float* m_taps; float* m_taps;
int m_tapsLength; int m_tapsLength;
float* m_buffer; float* m_buffer;
int m_currentBufferPostion; int m_currentBufferPosition;
}; };
#endif //cfirfilter_h #endif //cfirfilter_h