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Floating point to integer decimator optimization using the even/odd algorithm
This commit is contained in:
f4exb
parent
1213ad2a71
commit
48cc6df8a7
@ -130,6 +130,8 @@ set(sdrbase_HEADERS
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dsp/inthalfbandfilterdbf.h
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dsp/inthalfbandfiltereo1.h
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dsp/inthalfbandfiltereo1i.h
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dsp/inthalfbandfiltereo2.h
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dsp/inthalfbandfiltereof.h
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dsp/inthalfbandfilterst.h
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dsp/inthalfbandfiltersti.h
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dsp/kissfft.h
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@ -32,7 +32,7 @@ void DecimatorsFI::decimate1(SampleVector::iterator* it, const float* buf, qint3
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void DecimatorsFI::decimate2_cen(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double intbuf[2];
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float intbuf[2];
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for (int pos = 0; pos < nbIAndQ - 3; pos += 4)
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{
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@ -54,7 +54,7 @@ void DecimatorsFI::decimate2_cen(SampleVector::iterator* it, const float* buf, q
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void DecimatorsFI::decimate2_inf(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double xreal, yimag;
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float xreal, yimag;
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for (int pos = 0; pos < nbIAndQ - 7; pos += 8)
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{
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@ -74,7 +74,7 @@ void DecimatorsFI::decimate2_inf(SampleVector::iterator* it, const float* buf, q
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void DecimatorsFI::decimate2_sup(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double xreal, yimag;
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float xreal, yimag;
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for (int pos = 0; pos < nbIAndQ - 7; pos += 8)
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{
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@ -94,7 +94,7 @@ void DecimatorsFI::decimate2_sup(SampleVector::iterator* it, const float* buf, q
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void DecimatorsFI::decimate4_inf(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double xreal, yimag;
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float xreal, yimag;
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for (int pos = 0; pos < nbIAndQ - 7; pos += 8)
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{
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@ -116,7 +116,7 @@ void DecimatorsFI::decimate4_sup(SampleVector::iterator* it, const float* buf, q
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// Inf (LSB):
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// x y x y x y x y / x -> 0,-3,-4,7 / y -> 1,2,-5,-6
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// [ rotate: 0, 1, -3, 2, -4, -5, 7, -6]
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double xreal, yimag;
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float xreal, yimag;
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for (int pos = 0; pos < nbIAndQ - 7; pos += 8)
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{
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@ -132,7 +132,7 @@ void DecimatorsFI::decimate4_sup(SampleVector::iterator* it, const float* buf, q
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void DecimatorsFI::decimate8_inf(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double xreal[2], yimag[2];
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float xreal[2], yimag[2];
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for (int pos = 0; pos < nbIAndQ - 15; pos += 8)
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{
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@ -154,7 +154,7 @@ void DecimatorsFI::decimate8_inf(SampleVector::iterator* it, const float* buf, q
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void DecimatorsFI::decimate8_sup(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double xreal[2], yimag[2];
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float xreal[2], yimag[2];
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for (int pos = 0; pos < nbIAndQ - 15; pos += 8)
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{
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@ -178,7 +178,7 @@ void DecimatorsFI::decimate16_inf(SampleVector::iterator* it, const float* buf,
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{
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// Offset tuning: 4x downsample and rotate, then
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// downsample 4x more. [ rotate: 0, 1, -3, 2, -4, -5, 7, -6]
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double xreal[4], yimag[4];
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float xreal[4], yimag[4];
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for (int pos = 0; pos < nbIAndQ - 31; )
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{
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@ -205,7 +205,7 @@ void DecimatorsFI::decimate16_sup(SampleVector::iterator* it, const float* buf,
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{
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// Offset tuning: 4x downsample and rotate, then
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// downsample 4x more. [ rotate: 1, 0, -2, 3, -5, -4, 6, -7]
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double xreal[4], yimag[4];
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float xreal[4], yimag[4];
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for (int pos = 0; pos < nbIAndQ - 31; )
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{
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@ -230,7 +230,7 @@ void DecimatorsFI::decimate16_sup(SampleVector::iterator* it, const float* buf,
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void DecimatorsFI::decimate32_inf(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double xreal[8], yimag[8];
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float xreal[8], yimag[8];
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for (int pos = 0; pos < nbIAndQ - 63; )
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{
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@ -260,7 +260,7 @@ void DecimatorsFI::decimate32_inf(SampleVector::iterator* it, const float* buf,
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void DecimatorsFI::decimate32_sup(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double xreal[8], yimag[8];
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float xreal[8], yimag[8];
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for (int pos = 0; pos < nbIAndQ - 63; )
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{
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@ -290,7 +290,7 @@ void DecimatorsFI::decimate32_sup(SampleVector::iterator* it, const float* buf,
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void DecimatorsFI::decimate64_inf(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double xreal[16], yimag[16];
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float xreal[16], yimag[16];
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for (int pos = 0; pos < nbIAndQ - 127; )
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{
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@ -329,7 +329,7 @@ void DecimatorsFI::decimate64_inf(SampleVector::iterator* it, const float* buf,
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void DecimatorsFI::decimate64_sup(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double xreal[16], yimag[16];
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float xreal[16], yimag[16];
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for (int pos = 0; pos < nbIAndQ - 127; )
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{
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@ -368,7 +368,7 @@ void DecimatorsFI::decimate64_sup(SampleVector::iterator* it, const float* buf,
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void DecimatorsFI::decimate4_cen(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double intbuf[4];
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float intbuf[4];
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for (int pos = 0; pos < nbIAndQ - 7; pos += 8)
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{
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@ -402,7 +402,7 @@ void DecimatorsFI::decimate4_cen(SampleVector::iterator* it, const float* buf, q
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void DecimatorsFI::decimate8_cen(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double intbuf[8];
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float intbuf[8];
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for (int pos = 0; pos < nbIAndQ - 15; pos += 16)
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{
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@ -461,7 +461,7 @@ void DecimatorsFI::decimate8_cen(SampleVector::iterator* it, const float* buf, q
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void DecimatorsFI::decimate16_cen(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double intbuf[16];
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float intbuf[16];
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for (int pos = 0; pos < nbIAndQ - 31; pos += 32)
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{
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@ -569,7 +569,7 @@ void DecimatorsFI::decimate16_cen(SampleVector::iterator* it, const float* buf,
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void DecimatorsFI::decimate32_cen(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double intbuf[32];
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float intbuf[32];
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for (int pos = 0; pos < nbIAndQ - 63; pos += 64)
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{
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@ -774,7 +774,7 @@ void DecimatorsFI::decimate32_cen(SampleVector::iterator* it, const float* buf,
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void DecimatorsFI::decimate64_cen(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ)
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{
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double intbuf[64];
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float intbuf[64];
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for (int pos = 0; pos < nbIAndQ - 127; pos += 128)
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{
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@ -17,7 +17,7 @@
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#ifndef SDRBASE_DSP_DECIMATORSFI_H_
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#define SDRBASE_DSP_DECIMATORSFI_H_
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#include "dsp/inthalfbandfilterdbf.h"
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#include "dsp/inthalfbandfiltereof.h"
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#include "export.h"
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#define DECIMATORSFI_HB_FILTER_ORDER 64
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@ -46,12 +46,12 @@ public:
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void decimate64_sup(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ);
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void decimate64_cen(SampleVector::iterator* it, const float* buf, qint32 nbIAndQ);
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IntHalfbandFilterDBF<double, float, DECIMATORSFI_HB_FILTER_ORDER> m_decimator2; // 1st stages
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IntHalfbandFilterDBF<double, float, DECIMATORSFI_HB_FILTER_ORDER> m_decimator4; // 2nd stages
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IntHalfbandFilterDBF<double, float, DECIMATORSFI_HB_FILTER_ORDER> m_decimator8; // 3rd stages
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IntHalfbandFilterDBF<double, float, DECIMATORSFI_HB_FILTER_ORDER> m_decimator16; // 4th stages
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IntHalfbandFilterDBF<double, float, DECIMATORSFI_HB_FILTER_ORDER> m_decimator32; // 5th stages
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IntHalfbandFilterDBF<double, float, DECIMATORSFI_HB_FILTER_ORDER> m_decimator64; // 6th stages
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IntHalfbandFilterEOF<DECIMATORSFI_HB_FILTER_ORDER> m_decimator2; // 1st stages
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IntHalfbandFilterEOF<DECIMATORSFI_HB_FILTER_ORDER> m_decimator4; // 2nd stages
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IntHalfbandFilterEOF<DECIMATORSFI_HB_FILTER_ORDER> m_decimator8; // 3rd stages
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IntHalfbandFilterEOF<DECIMATORSFI_HB_FILTER_ORDER> m_decimator16; // 4th stages
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IntHalfbandFilterEOF<DECIMATORSFI_HB_FILTER_ORDER> m_decimator32; // 5th stages
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IntHalfbandFilterEOF<DECIMATORSFI_HB_FILTER_ORDER> m_decimator64; // 6th stages
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};
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231
sdrbase/dsp/inthalfbandfiltereof.h
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231
sdrbase/dsp/inthalfbandfiltereof.h
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@ -0,0 +1,231 @@
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2018 F4EXB //
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// written by Edouard Griffiths //
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// //
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// Integer half-band FIR based interpolator and decimator //
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// This is the even/odd double buffer variant. Really useful only when SIMD is //
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// used //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef SDRBASE_DSP_INTHALFBANDFILTEREOF_H_
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#define SDRBASE_DSP_INTHALFBANDFILTEREOF_H_
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#include <stdint.h>
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#include <cstdlib>
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#include "dsp/dsptypes.h"
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#include "dsp/hbfiltertraits.h"
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#include "export.h"
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template<uint32_t HBFilterOrder>
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class SDRBASE_API IntHalfbandFilterEOF {
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public:
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IntHalfbandFilterEOF();
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bool workDecimateCenter(float *x, float *y)
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{
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// insert sample into ring-buffer
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storeSample(*x, *y);
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switch(m_state)
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{
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case 0:
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 1;
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// tell caller we don't have a new sample
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return false;
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default:
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// save result
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doFIR(x, y);
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 0;
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// tell caller we have a new sample
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return true;
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}
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}
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void myDecimate(float x1, float y1, float *x2, float *y2)
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{
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storeSample(x1, y1);
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advancePointer();
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storeSample(*x2, *y2);
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doFIR(x2, y2);
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advancePointer();
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}
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/** Simple zero stuffing and filter */
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void myInterpolateZeroStuffing(float *x1, float *y1, float *x2, float *y2)
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{
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storeSample(*x1, *y1);
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doFIR(x1, y1);
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advancePointer();
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storeSample(0, 0);
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doFIR(x2, y2);
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advancePointer();
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}
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/** Optimized upsampler by 2 not calculating FIR with inserted null samples */
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void myInterpolate(float *x1, float *y1, float *x2, float *y2)
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{
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// insert sample into ring double buffer
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m_samples[m_ptr][0] = *x1;
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m_samples[m_ptr][1] = *y1;
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m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = *x1;
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m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = *y1;
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// advance pointer
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if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
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m_ptr++;
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} else {
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m_ptr = 0;
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}
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// first output sample calculated with the middle peak
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*x1 = m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0];
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*y1 = m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1];
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// second sample calculated with the filter
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doInterpolateFIR(x2, y2);
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}
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protected:
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double m_even[2][HBFIRFilterTraits<HBFilterOrder>::hbOrder]; // double buffer technique
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double m_odd[2][HBFIRFilterTraits<HBFilterOrder>::hbOrder]; // double buffer technique
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double m_samples[HBFIRFilterTraits<HBFilterOrder>::hbOrder][2]; // double buffer technique
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int m_ptr;
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int m_size;
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int m_state;
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void storeSample(float x, float y)
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{
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if ((m_ptr % 2) == 0)
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{
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m_even[0][m_ptr/2] = x;
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m_even[1][m_ptr/2] = y;
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m_even[0][m_ptr/2 + m_size] = x;
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m_even[1][m_ptr/2 + m_size] = y;
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}
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else
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{
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m_odd[0][m_ptr/2] = x;
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m_odd[1][m_ptr/2] = y;
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m_odd[0][m_ptr/2 + m_size] = x;
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m_odd[1][m_ptr/2 + m_size] = y;
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}
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}
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void advancePointer()
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{
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m_ptr = m_ptr + 1 < 2*m_size ? m_ptr + 1: 0;
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}
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void doFIR(float *x, float *y)
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{
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double iAcc = 0;
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double qAcc = 0;
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//#if defined(USE_SSE4_1) && !defined(NO_DSP_SIMD)
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// IntHalfbandFilterEO1Intrisics<HBFilterOrder>::work(
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// m_ptr,
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// m_even,
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// m_odd,
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// iAcc,
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// qAcc
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// );
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//#else
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int a = m_ptr/2 + m_size; // tip pointer
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int b = m_ptr/2 + 1; // tail pointer
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for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
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{
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if ((m_ptr % 2) == 0)
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{
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iAcc += (m_even[0][a] + m_even[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
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qAcc += (m_even[1][a] + m_even[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
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}
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else
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{
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iAcc += (m_odd[0][a] + m_odd[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
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qAcc += (m_odd[1][a] + m_odd[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
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}
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a -= 1;
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b += 1;
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}
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//#endif
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if ((m_ptr % 2) == 0)
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{
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iAcc += m_odd[0][m_ptr/2 + m_size/2] * 0.5f;
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qAcc += m_odd[1][m_ptr/2 + m_size/2] * 0.5f;
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}
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else
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{
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iAcc += m_even[0][m_ptr/2 + m_size/2 + 1] * 0.5f;
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qAcc += m_even[1][m_ptr/2 + m_size/2 + 1] * 0.5f;
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}
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*x = iAcc; // HB_SHIFT incorrect do not loose the gained bit
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*y = qAcc;
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}
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void doInterpolateFIR(float *x, float *y)
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{
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qint32 iAcc = 0;
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qint32 qAcc = 0;
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qint16 a = m_ptr;
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qint16 b = m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder / 2) - 1;
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// go through samples in buffer
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for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
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{
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iAcc += (m_samples[a][0] + m_samples[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
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qAcc += (m_samples[a][1] + m_samples[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
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a++;
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b--;
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}
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*x = iAcc * SDR_RX_SCALED;
|
||||
*y = qAcc * SDR_RX_SCALED;
|
||||
}
|
||||
};
|
||||
|
||||
template<uint32_t HBFilterOrder>
|
||||
IntHalfbandFilterEOF<HBFilterOrder>::IntHalfbandFilterEOF()
|
||||
{
|
||||
m_size = HBFIRFilterTraits<HBFilterOrder>::hbOrder/2;
|
||||
|
||||
for (int i = 0; i < 2*m_size; i++)
|
||||
{
|
||||
m_even[0][i] = 0.0f;
|
||||
m_even[1][i] = 0.0f;
|
||||
m_odd[0][i] = 0.0f;
|
||||
m_odd[1][i] = 0.0f;
|
||||
m_samples[i][0] = 0.0f;
|
||||
m_samples[i][1] = 0.0f;
|
||||
}
|
||||
|
||||
m_ptr = 0;
|
||||
m_state = 0;
|
||||
}
|
||||
|
||||
#endif /* SDRBASE_DSP_INTHALFBANDFILTEREOF_H_ */
|
||||
Loading…
Reference in New Issue
Block a user