mirror of
https://github.com/f4exb/sdrangel.git
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650 lines
21 KiB
C++
650 lines
21 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016 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_INTHALFBANDFILTEREO_H_
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#define SDRBASE_DSP_INTHALFBANDFILTEREO_H_
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#ifdef USE_SIMD
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#include <smmintrin.h>
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#endif
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#include <stdint.h>
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#include "dsp/dsptypes.h"
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#include "dsp/hbfiltertraits.h"
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#include "util/export.h"
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template<uint32_t HBFilterOrder>
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class SDRANGEL_API IntHalfbandFilterEO1 {
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public:
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IntHalfbandFilterEO1();
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// downsample by 2, return center part of original spectrum
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bool workDecimateCenter(Sample* sample)
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{
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// insert sample into ring-buffer
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storeSample((FixReal) sample->real(), (FixReal) sample->imag());
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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(sample);
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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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// upsample by 2, return center part of original spectrum - double buffer variant
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bool workInterpolateCenter(Sample* sampleIn, Sample *SampleOut)
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{
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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storeSample(0, 0);
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// save result
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doFIR(SampleOut);
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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 didn't consume the sample
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return false;
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default:
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// insert sample into ring-buffer
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storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
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// save result
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doFIR(SampleOut);
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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 consumed the sample
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return true;
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}
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}
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bool workDecimateCenter(qint32 *x, qint32 *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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// downsample by 2, return lower half of original spectrum
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bool workDecimateLowerHalf(Sample* sample)
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{
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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storeSample((FixReal) -sample->imag(), (FixReal) sample->real());
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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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case 1:
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// insert sample into ring-buffer
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storeSample((FixReal) -sample->real(), (FixReal) -sample->imag());
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// save result
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doFIR(sample);
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 2;
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// tell caller we have a new sample
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return true;
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case 2:
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// insert sample into ring-buffer
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storeSample((FixReal) sample->imag(), (FixReal) -sample->real());
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 3;
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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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// insert sample into ring-buffer
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storeSample((FixReal) sample->real(), (FixReal) sample->imag());
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// save result
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doFIR(sample);
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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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// upsample by 2, from lower half of original spectrum - double buffer variant
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bool workInterpolateLowerHalf(Sample* sampleIn, Sample *sampleOut)
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{
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Sample s;
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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storeSample(0, 0);
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// save result
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doFIR(&s);
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sampleOut->setReal(s.imag());
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sampleOut->setImag(-s.real());
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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 didn't consume the sample
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return false;
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case 1:
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// insert sample into ring-buffer
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storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
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// save result
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doFIR(&s);
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sampleOut->setReal(-s.real());
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sampleOut->setImag(-s.imag());
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 2;
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// tell caller we consumed the sample
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return true;
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case 2:
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// insert sample into ring-buffer
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storeSample(0, 0);
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// save result
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doFIR(&s);
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sampleOut->setReal(-s.imag());
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sampleOut->setImag(s.real());
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 3;
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// tell caller we didn't consume the sample
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return false;
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default:
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// insert sample into ring-buffer
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storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
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// save result
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doFIR(&s);
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sampleOut->setReal(s.real());
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sampleOut->setImag(s.imag());
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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 consumed the sample
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return true;
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}
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}
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// downsample by 2, return upper half of original spectrum
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bool workDecimateUpperHalf(Sample* sample)
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{
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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storeSample((FixReal) sample->imag(), (FixReal) -sample->real());
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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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case 1:
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// insert sample into ring-buffer
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storeSample((FixReal) -sample->real(), (FixReal) -sample->imag());
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// save result
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doFIR(sample);
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 2;
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// tell caller we have a new sample
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return true;
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case 2:
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// insert sample into ring-buffer
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storeSample((FixReal) -sample->imag(), (FixReal) sample->real());
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 3;
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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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// insert sample into ring-buffer
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storeSample((FixReal) sample->real(), (FixReal) sample->imag());
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// save result
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doFIR(sample);
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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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// upsample by 2, move original spectrum to upper half - double buffer variant
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bool workInterpolateUpperHalf(Sample* sampleIn, Sample *sampleOut)
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{
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Sample s;
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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storeSample(0, 0);
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// save result
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doFIR(&s);
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sampleOut->setReal(-s.imag());
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sampleOut->setImag(s.real());
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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 didn't consume the sample
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return false;
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case 1:
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// insert sample into ring-buffer
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storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
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// save result
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doFIR(&s);
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sampleOut->setReal(-s.real());
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sampleOut->setImag(-s.imag());
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 2;
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// tell caller we consumed the sample
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return true;
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case 2:
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// insert sample into ring-buffer
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storeSample(0, 0);
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// save result
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doFIR(&s);
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sampleOut->setReal(s.imag());
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sampleOut->setImag(-s.real());
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// advance write-pointer
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advancePointer();
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// next state
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m_state = 3;
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// tell caller we didn't consume the sample
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return false;
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default:
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// insert sample into ring-buffer
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storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
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// save result
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doFIR(&s);
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sampleOut->setReal(s.real());
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sampleOut->setImag(s.imag());
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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 consumed the sample
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return true;
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}
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}
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void myDecimate(const Sample* sample1, Sample* sample2)
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{
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storeSample((FixReal) sample1->real(), (FixReal) sample1->imag());
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advancePointer();
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storeSample((FixReal) sample2->real(), (FixReal) sample2->imag());
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doFIR(sample2);
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advancePointer();
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}
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void myDecimate(qint32 x1, qint32 y1, qint32 *x2, qint32 *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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protected:
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qint32 m_even[2][HBFIRFilterTraits<HBFilterOrder>::hbOrder]; // double buffer technique
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qint32 m_odd[2][HBFIRFilterTraits<HBFilterOrder>::hbOrder]; // double buffer technique
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int m_ptr;
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int m_sizeEO;
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int m_state;
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void storeSample(const FixReal& sampleI, const FixReal& sampleQ)
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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] = sampleI;
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m_even[1][m_ptr/2] = sampleQ;
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m_even[0][m_ptr/2 + m_sizeEO] = sampleI;
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m_even[1][m_ptr/2 + m_sizeEO] = sampleQ;
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}
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else
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{
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m_odd[0][m_ptr/2] = sampleI;
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m_odd[1][m_ptr/2] = sampleQ;
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m_odd[0][m_ptr/2 + m_sizeEO] = sampleI;
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m_odd[1][m_ptr/2 + m_sizeEO] = sampleQ;
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}
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}
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void storeSample(qint32 x, qint32 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_sizeEO] = x;
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m_even[1][m_ptr/2 + m_sizeEO] = 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_sizeEO] = x;
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m_odd[1][m_ptr/2 + m_sizeEO] = 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_sizeEO);
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}
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void doFIR(Sample* sample)
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{
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int a = m_ptr/2 + m_sizeEO; // tip pointer
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int b = m_ptr/2 + 1; // tail pointer
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qint32 iAcc = 0;
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qint32 qAcc = 0;
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#ifdef USE_SIMD
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//#warning "IntHalfbandFiler SIMD"
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const __m128i* h = (const __m128i*) HBFIRFilterTraits<HBFilterOrder>::hbCoeffs;
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__m128i sumI = _mm_setzero_si128();
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__m128i sumQ = _mm_setzero_si128();
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__m128i sa, sb;
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a -= 3;
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for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 16; i++)
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{
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if ((m_ptr % 2) == 0)
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{
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sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(m_even[0][a])), _MM_SHUFFLE(0,1,2,3));
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sb = _mm_loadu_si128((__m128i*) &(m_even[0][b]));
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sumI = _mm_add_epi32(sumI, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
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sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(m_even[1][a])), _MM_SHUFFLE(0,1,2,3));
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sb = _mm_loadu_si128((__m128i*) &(m_even[1][b]));
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sumQ = _mm_add_epi32(sumQ, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
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}
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else
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{
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sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(m_odd[0][a])), _MM_SHUFFLE(0,1,2,3));
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sb = _mm_loadu_si128((__m128i*) &(m_odd[0][b]));
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sumI = _mm_add_epi32(sumI, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
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sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(m_odd[1][a])), _MM_SHUFFLE(0,1,2,3));
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sb = _mm_loadu_si128((__m128i*) &(m_odd[1][b]));
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sumQ = _mm_add_epi32(sumQ, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
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}
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a -= 4;
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b += 4;
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++h;
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}
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// horizontal add of four 32 bit partial sums
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sumI = _mm_add_epi32(sumI, _mm_srli_si128(sumI, 8));
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sumI = _mm_add_epi32(sumI, _mm_srli_si128(sumI, 4));
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iAcc = _mm_cvtsi128_si32(sumI);
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sumQ = _mm_add_epi32(sumQ, _mm_srli_si128(sumQ, 8));
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sumQ = _mm_add_epi32(sumQ, _mm_srli_si128(sumQ, 4));
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qAcc = _mm_cvtsi128_si32(sumQ);
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#else
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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>::hbCoeffs[i];
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qAcc += (m_even[1][a] + m_even[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[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>::hbCoeffs[i];
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qAcc += (m_odd[1][a] + m_odd[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[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 += ((qint32)m_odd[0][m_ptr/2 + m_sizeEO/2]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
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qAcc += ((qint32)m_odd[1][m_ptr/2 + m_sizeEO/2]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
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}
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else
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{
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iAcc += ((qint32)m_even[0][m_ptr/2 + m_sizeEO/2 + 1]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
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qAcc += ((qint32)m_even[1][m_ptr/2 + m_sizeEO/2 + 1]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
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}
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sample->setReal(iAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
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sample->setImag(qAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
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}
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|
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void doFIR(qint32 *x, qint32 *y)
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{
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int a = m_ptr/2 + m_sizeEO; // tip pointer
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int b = m_ptr/2 + 1; // tail pointer
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|
|
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qint32 iAcc = 0;
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|
qint32 qAcc = 0;
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|
|
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#ifdef USE_SIMD
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const __m128i* h = (const __m128i*) HBFIRFilterTraits<HBFilterOrder>::hbCoeffs;
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__m128i sumI = _mm_setzero_si128();
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__m128i sumQ = _mm_setzero_si128();
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|
__m128i sa, sb;
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a -= 3;
|
|
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 16; i++)
|
|
{
|
|
if ((m_ptr % 2) == 0)
|
|
{
|
|
sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(m_even[0][a])), _MM_SHUFFLE(0,1,2,3));
|
|
sb = _mm_loadu_si128((__m128i*) &(m_even[0][b]));
|
|
sumI = _mm_add_epi32(sumI, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
|
|
|
|
sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(m_even[1][a])), _MM_SHUFFLE(0,1,2,3));
|
|
sb = _mm_loadu_si128((__m128i*) &(m_even[1][b]));
|
|
sumQ = _mm_add_epi32(sumQ, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
|
|
}
|
|
else
|
|
{
|
|
sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(m_odd[0][a])), _MM_SHUFFLE(0,1,2,3));
|
|
sb = _mm_loadu_si128((__m128i*) &(m_odd[0][b]));
|
|
sumI = _mm_add_epi32(sumI, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
|
|
|
|
sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(m_odd[1][a])), _MM_SHUFFLE(0,1,2,3));
|
|
sb = _mm_loadu_si128((__m128i*) &(m_odd[1][b]));
|
|
sumQ = _mm_add_epi32(sumQ, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
|
|
}
|
|
|
|
a -= 4;
|
|
b += 4;
|
|
++h;
|
|
}
|
|
|
|
// horizontal add of four 32 bit partial sums
|
|
|
|
sumI = _mm_add_epi32(sumI, _mm_srli_si128(sumI, 8));
|
|
sumI = _mm_add_epi32(sumI, _mm_srli_si128(sumI, 4));
|
|
iAcc = _mm_cvtsi128_si32(sumI);
|
|
|
|
sumQ = _mm_add_epi32(sumQ, _mm_srli_si128(sumQ, 8));
|
|
sumQ = _mm_add_epi32(sumQ, _mm_srli_si128(sumQ, 4));
|
|
qAcc = _mm_cvtsi128_si32(sumQ);
|
|
#else
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
|
|
{
|
|
if ((m_ptr % 2) == 0)
|
|
{
|
|
iAcc += (m_even[0][a] + m_even[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
qAcc += (m_even[1][a] + m_even[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
}
|
|
else
|
|
{
|
|
iAcc += (m_odd[0][a] + m_odd[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
qAcc += (m_odd[1][a] + m_odd[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
}
|
|
|
|
a -= 1;
|
|
b += 1;
|
|
}
|
|
#endif
|
|
if ((m_ptr % 2) == 0)
|
|
{
|
|
iAcc += ((qint32)m_odd[0][m_ptr/2 + m_sizeEO/2]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
qAcc += ((qint32)m_odd[1][m_ptr/2 + m_sizeEO/2]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
}
|
|
else
|
|
{
|
|
iAcc += ((qint32)m_even[0][m_ptr/2 + m_sizeEO/2 + 1]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
qAcc += ((qint32)m_even[1][m_ptr/2 + m_sizeEO/2 + 1]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
}
|
|
|
|
*x = iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1); // HB_SHIFT incorrect do not loose the gained bit
|
|
*y = qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
|
|
}
|
|
};
|
|
|
|
template<uint32_t HBFilterOrder>
|
|
IntHalfbandFilterEO1<HBFilterOrder>::IntHalfbandFilterEO1()
|
|
{
|
|
m_sizeEO = HBFIRFilterTraits<HBFilterOrder>::hbOrder/2;
|
|
|
|
for (int i = 0; i < 2*m_sizeEO; i++)
|
|
{
|
|
m_even[0][i] = 0;
|
|
m_even[1][i] = 0;
|
|
m_odd[0][i] = 0;
|
|
m_odd[1][i] = 0;
|
|
}
|
|
|
|
m_ptr = 0;
|
|
m_state = 0;
|
|
}
|
|
|
|
#endif /* SDRBASE_DSP_INTHALFBANDFILTEREO_H_ */
|