mirror of https://github.com/f4exb/sdrangel.git
499 lines
16 KiB
C++
499 lines
16 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015 Edouard Griffiths, F4EXB //
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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 INCLUDE_GPL_DSP_DECIMATORS_H_
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#define INCLUDE_GPL_DSP_DECIMATORS_H_
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#include "dsp/dsptypes.h"
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#include "dsp/inthalfbandfilter.h"
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template<typename T>
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class Decimators
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{
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public:
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void decimate1(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate2_u(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate2(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate2_sup(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate2_cen(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate4(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate4_sup(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate4_cen(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate8(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate8_sup(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate8_cen(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate16(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate16_sup(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate16_cen(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate32(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate32_sup(SampleVector::iterator* it, const T* buf, qint32 len);
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void decimate32_cen(SampleVector::iterator* it, const T* buf, qint32 len);
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private:
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IntHalfbandFilter m_decimator2; // 1st stages
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IntHalfbandFilter m_decimator4; // 2nd stages
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IntHalfbandFilter m_decimator8; // 3rd stages
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IntHalfbandFilter m_decimator16; // 4th stages
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IntHalfbandFilter m_decimator32; // 5th stages
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};
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template<typename T>
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void Decimators<T>::decimate1(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len; pos += 2) {
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xreal = buf[pos+0];
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yimag = buf[pos+1];
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Sample s( xreal * 16, yimag * 16 ); // shift by 4 bit positions (signed)
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**it = s;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate2_u(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 7; pos += 8) {
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xreal = buf[pos+0] - buf[pos+3];
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yimag = buf[pos+1] + buf[pos+2] - 255;
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Sample s( xreal << 3, yimag << 3 );
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**it = s;
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(*it)++;
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xreal = buf[pos+7] - buf[pos+4];
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yimag = 255 - buf[pos+5] - buf[pos+6];
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Sample t( xreal << 3, yimag << 3 );
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**it = t;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate2(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 7; pos += 8) {
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xreal = buf[pos+0] - buf[pos+3];
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yimag = buf[pos+1] + buf[pos+2];
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Sample s( xreal << 3, yimag << 3 );
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**it = s;
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(*it)++;
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xreal = buf[pos+7] - buf[pos+4];
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yimag = - buf[pos+5] - buf[pos+6];
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Sample t( xreal << 3, yimag << 3 );
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**it = t;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate2_sup(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 7; pos += 8) {
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xreal = buf[pos+1] - buf[pos+2];
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yimag = - buf[pos+0] - buf[pos+3];
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Sample s( xreal << 3, yimag << 3 );
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**it = s;
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(*it)++;
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xreal = buf[pos+6] - buf[pos+5];
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yimag = buf[pos+4] + buf[pos+7];
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Sample t( xreal << 3, yimag << 3 );
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**it = t;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate2_cen(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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for (int pos = 0; pos < len - 3; pos += 4) {
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Sample s1(buf[pos+0] << 3, buf[pos+1] << 3);
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Sample s2(buf[pos+2] << 3, buf[pos+3] << 3);
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m_decimator2.myDecimate(&s1, &s2);
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**it = s2;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate4_cen(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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for (int pos = 0; pos < len - 7; pos += 8) {
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Sample s1(buf[pos+0] << 4, buf[pos+1] << 4);
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Sample s2(buf[pos+2] << 4, buf[pos+3] << 4);
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Sample s3(buf[pos+4] << 4, buf[pos+5] << 4);
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Sample s4(buf[pos+6] << 4, buf[pos+7] << 4);
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m_decimator2.myDecimate(&s1, &s2);
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m_decimator2.myDecimate(&s3, &s4);
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m_decimator4.myDecimate(&s2, &s4);
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**it = s4;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate8_cen(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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for (int pos = 0; pos < len - 15; pos += 16) {
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Sample s1(buf[pos+0] << 4, buf[pos+1] << 4);
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Sample s2(buf[pos+2] << 4, buf[pos+3] << 4);
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Sample s3(buf[pos+4] << 4, buf[pos+5] << 4);
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Sample s4(buf[pos+6] << 4, buf[pos+7] << 4);
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Sample s5(buf[pos+8] << 4, buf[pos+9] << 4);
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Sample s6(buf[pos+10] << 4, buf[pos+11] << 4);
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Sample s7(buf[pos+12] << 4, buf[pos+13] << 4);
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Sample s8(buf[pos+14] << 4, buf[pos+15] << 4);
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m_decimator2.myDecimate(&s1, &s2);
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m_decimator2.myDecimate(&s3, &s4);
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m_decimator2.myDecimate(&s5, &s6);
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m_decimator2.myDecimate(&s7, &s8);
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m_decimator4.myDecimate(&s2, &s4);
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m_decimator4.myDecimate(&s6, &s8);
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m_decimator8.myDecimate(&s4, &s8);
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**it = s8;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate16_cen(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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for (int pos = 0; pos < len - 31; pos += 32) {
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Sample s1(buf[pos+0] << 4, buf[pos+1] << 4);
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Sample s2(buf[pos+2] << 4, buf[pos+3] << 4);
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Sample s3(buf[pos+4] << 4, buf[pos+5] << 4);
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Sample s4(buf[pos+6] << 4, buf[pos+7] << 4);
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Sample s5(buf[pos+8] << 4, buf[pos+9] << 4);
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Sample s6(buf[pos+10] << 4, buf[pos+11] << 4);
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Sample s7(buf[pos+12] << 4, buf[pos+13] << 4);
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Sample s8(buf[pos+14] << 4, buf[pos+15] << 4);
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Sample s9(buf[pos+16] << 4, buf[pos+17] << 4);
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Sample s10(buf[pos+18] << 4, buf[pos+19] << 4);
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Sample s11(buf[pos+20] << 4, buf[pos+21] << 4);
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Sample s12(buf[pos+22] << 4, buf[pos+23] << 4);
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Sample s13(buf[pos+24] << 4, buf[pos+25] << 4);
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Sample s14(buf[pos+26] << 4, buf[pos+27] << 4);
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Sample s15(buf[pos+28] << 4, buf[pos+29] << 4);
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Sample s16(buf[pos+30] << 4, buf[pos+31] << 4);
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m_decimator2.myDecimate(&s1, &s2);
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m_decimator2.myDecimate(&s3, &s4);
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m_decimator2.myDecimate(&s5, &s6);
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m_decimator2.myDecimate(&s7, &s8);
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m_decimator2.myDecimate(&s9, &s10);
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m_decimator2.myDecimate(&s11, &s12);
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m_decimator2.myDecimate(&s13, &s14);
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m_decimator2.myDecimate(&s15, &s16);
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m_decimator4.myDecimate(&s2, &s4);
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m_decimator4.myDecimate(&s6, &s8);
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m_decimator4.myDecimate(&s10, &s12);
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m_decimator4.myDecimate(&s14, &s16);
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m_decimator8.myDecimate(&s4, &s8);
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m_decimator8.myDecimate(&s12, &s16);
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m_decimator16.myDecimate(&s8, &s16);
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**it = s16;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate32_cen(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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for (int pos = 0; pos < len - 63; pos += 64) {
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Sample s1(buf[pos+0] << 4, buf[pos+1] << 4);
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Sample s2(buf[pos+2] << 4, buf[pos+3] << 4);
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Sample s3(buf[pos+4] << 4, buf[pos+5] << 4);
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Sample s4(buf[pos+6] << 4, buf[pos+7] << 4);
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Sample s5(buf[pos+8] << 4, buf[pos+9] << 4);
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Sample s6(buf[pos+10] << 4, buf[pos+11] << 4);
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Sample s7(buf[pos+12] << 4, buf[pos+13] << 4);
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Sample s8(buf[pos+14] << 4, buf[pos+15] << 4);
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Sample s9(buf[pos+16] << 4, buf[pos+17] << 4);
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Sample s10(buf[pos+18] << 4, buf[pos+19] << 4);
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Sample s11(buf[pos+20] << 4, buf[pos+21] << 4);
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Sample s12(buf[pos+22] << 4, buf[pos+23] << 4);
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Sample s13(buf[pos+24] << 4, buf[pos+25] << 4);
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Sample s14(buf[pos+26] << 4, buf[pos+27] << 4);
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Sample s15(buf[pos+28] << 4, buf[pos+29] << 4);
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Sample s16(buf[pos+30] << 4, buf[pos+31] << 4);
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Sample s17(buf[pos+32] << 4, buf[pos+33] << 4);
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Sample s18(buf[pos+34] << 4, buf[pos+35] << 4);
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Sample s19(buf[pos+36] << 4, buf[pos+37] << 4);
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Sample s20(buf[pos+38] << 4, buf[pos+39] << 4);
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Sample s21(buf[pos+40] << 4, buf[pos+41] << 4);
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Sample s22(buf[pos+42] << 4, buf[pos+43] << 4);
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Sample s23(buf[pos+44] << 4, buf[pos+45] << 4);
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Sample s24(buf[pos+46] << 4, buf[pos+47] << 4);
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Sample s25(buf[pos+48] << 4, buf[pos+49] << 4);
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Sample s26(buf[pos+50] << 4, buf[pos+51] << 4);
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Sample s27(buf[pos+52] << 4, buf[pos+53] << 4);
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Sample s28(buf[pos+54] << 4, buf[pos+55] << 4);
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Sample s29(buf[pos+56] << 4, buf[pos+57] << 4);
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Sample s30(buf[pos+58] << 4, buf[pos+59] << 4);
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Sample s31(buf[pos+60] << 4, buf[pos+61] << 4);
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Sample s32(buf[pos+62] << 4, buf[pos+63] << 4);
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m_decimator2.myDecimate(&s1, &s2);
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m_decimator2.myDecimate(&s3, &s4);
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m_decimator2.myDecimate(&s5, &s6);
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m_decimator2.myDecimate(&s7, &s8);
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m_decimator2.myDecimate(&s9, &s10);
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m_decimator2.myDecimate(&s11, &s12);
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m_decimator2.myDecimate(&s13, &s14);
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m_decimator2.myDecimate(&s15, &s16);
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m_decimator2.myDecimate(&s17, &s18);
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m_decimator2.myDecimate(&s19, &s20);
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m_decimator2.myDecimate(&s21, &s22);
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m_decimator2.myDecimate(&s23, &s24);
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m_decimator2.myDecimate(&s25, &s26);
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m_decimator2.myDecimate(&s27, &s28);
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m_decimator2.myDecimate(&s29, &s30);
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m_decimator2.myDecimate(&s31, &s32);
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m_decimator4.myDecimate(&s2, &s4);
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m_decimator4.myDecimate(&s6, &s8);
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m_decimator4.myDecimate(&s10, &s12);
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m_decimator4.myDecimate(&s14, &s16);
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m_decimator4.myDecimate(&s18, &s20);
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m_decimator4.myDecimate(&s22, &s24);
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m_decimator4.myDecimate(&s26, &s28);
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m_decimator4.myDecimate(&s30, &s32);
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m_decimator8.myDecimate(&s4, &s8);
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m_decimator8.myDecimate(&s12, &s16);
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m_decimator8.myDecimate(&s20, &s24);
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m_decimator8.myDecimate(&s28, &s32);
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m_decimator16.myDecimate(&s8, &s16);
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m_decimator16.myDecimate(&s24, &s32);
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m_decimator32.myDecimate(&s16, &s32);
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**it = s32;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate4(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 7; pos += 8) {
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xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
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yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
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Sample s( xreal << 2, yimag << 2 ); // was shift 3
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**it = s;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate4_sup(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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// Sup (USB):
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// x y x y x y x y / x -> 1,-2,-5,6 / y -> -0,-3,4,7
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// [ rotate: 1, 0, -2, 3, -5, -4, 6, -7]
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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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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 7; pos += 8) {
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xreal = buf[pos+1] - buf[pos+2] - buf[pos+5] + buf[pos+6];
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yimag = - buf[pos+0] - buf[pos+3] + buf[pos+4] + buf[pos+7];
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//xreal = buf[pos+0] - buf[pos+3] - buf[pos+4] + buf[pos+7];
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//yimag = buf[pos+1] + buf[pos+2] - buf[pos+5] - buf[pos+6];
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Sample s( xreal << 2, yimag << 2 ); // was shift 3
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**it = s;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate8(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 15; pos += 8) {
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xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
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yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
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Sample s1( xreal << 2, yimag << 2 ); // was shift 3
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pos += 8;
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xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
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yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
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Sample s2( xreal << 2, yimag << 2 ); // was shift 3
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m_decimator2.myDecimate(&s1, &s2);
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**it = s2;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate8_sup(SampleVector::iterator* it, const T* buf, qint32 len)
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{
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qint16 xreal, yimag;
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for (int pos = 0; pos < len - 15; pos += 8) {
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xreal = buf[pos+1] - buf[pos+2] - buf[pos+5] + buf[pos+6];
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yimag = - buf[pos+0] - buf[pos+3] + buf[pos+4] + buf[pos+7];
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Sample s1( xreal << 2, yimag << 2 ); // was shift 3
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pos += 8;
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xreal = buf[pos+1] - buf[pos+2] - buf[pos+5] + buf[pos+6];
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yimag = - buf[pos+0] - buf[pos+3] + buf[pos+4] + buf[pos+7];
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Sample s2( xreal << 2, yimag << 2 ); // was shift 3
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m_decimator2.myDecimate(&s1, &s2);
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**it = s2;
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(*it)++;
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}
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}
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template<typename T>
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void Decimators<T>::decimate16(SampleVector::iterator* it, const T* buf, qint32 len)
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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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qint16 xreal[4], yimag[4];
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for (int pos = 0; pos < len - 31; ) {
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for (int i = 0; i < 4; i++) {
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xreal[i] = (buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4]) << 2; // was shift 4
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yimag[i] = (buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6]) << 2; // was shift 4
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pos += 8;
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}
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|
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Sample s1( xreal[0], yimag[0] );
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Sample s2( xreal[1], yimag[1] );
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Sample s3( xreal[2], yimag[2] );
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Sample s4( xreal[3], yimag[3] );
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|
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m_decimator2.myDecimate(&s1, &s2);
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m_decimator2.myDecimate(&s3, &s4);
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|
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m_decimator4.myDecimate(&s2, &s4);
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|
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**it = s4;
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(*it)++;
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}
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|
}
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|
|
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template<typename T>
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void Decimators<T>::decimate16_sup(SampleVector::iterator* it, const T* buf, qint32 len)
|
|
{
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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]
|
|
qint16 xreal[4], yimag[4];
|
|
|
|
for (int pos = 0; pos < len - 31; ) {
|
|
for (int i = 0; i < 4; i++) {
|
|
xreal[i] = (buf[pos+1] - buf[pos+2] - buf[pos+5] + buf[pos+6]) << 2; // was shift 4
|
|
yimag[i] = (buf[pos+4] + buf[pos+7] - buf[pos+0] - buf[pos+3]) << 2; // was shift 4
|
|
pos += 8;
|
|
}
|
|
|
|
Sample s1( xreal[0], yimag[0] );
|
|
Sample s2( xreal[1], yimag[1] );
|
|
Sample s3( xreal[2], yimag[2] );
|
|
Sample s4( xreal[3], yimag[3] );
|
|
|
|
m_decimator2.myDecimate(&s1, &s2);
|
|
m_decimator2.myDecimate(&s3, &s4);
|
|
|
|
m_decimator4.myDecimate(&s2, &s4);
|
|
|
|
**it = s4;
|
|
(*it)++;
|
|
}
|
|
}
|
|
|
|
template<typename T>
|
|
void Decimators<T>::decimate32(SampleVector::iterator* it, const T* buf, qint32 len)
|
|
{
|
|
qint16 xreal[8], yimag[8];
|
|
|
|
for (int pos = 0; pos < len - 63; ) {
|
|
for (int i = 0; i < 8; i++) {
|
|
xreal[i] = (buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4]) << 2;
|
|
yimag[i] = (buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6]) << 2;
|
|
pos += 8;
|
|
}
|
|
|
|
Sample s1( xreal[0], yimag[0] );
|
|
Sample s2( xreal[1], yimag[1] );
|
|
Sample s3( xreal[2], yimag[2] );
|
|
Sample s4( xreal[3], yimag[3] );
|
|
Sample s5( xreal[4], yimag[4] );
|
|
Sample s6( xreal[5], yimag[5] );
|
|
Sample s7( xreal[6], yimag[6] );
|
|
Sample s8( xreal[7], yimag[7] );
|
|
|
|
m_decimator2.myDecimate(&s1, &s2);
|
|
m_decimator2.myDecimate(&s3, &s4);
|
|
m_decimator2.myDecimate(&s5, &s6);
|
|
m_decimator2.myDecimate(&s7, &s8);
|
|
|
|
m_decimator4.myDecimate(&s2, &s4);
|
|
m_decimator4.myDecimate(&s6, &s8);
|
|
|
|
m_decimator8.myDecimate(&s4, &s8);
|
|
|
|
**it = s8;
|
|
(*it)++;
|
|
}
|
|
}
|
|
|
|
template<typename T>
|
|
void Decimators<T>::decimate32_sup(SampleVector::iterator* it, const T* buf, qint32 len)
|
|
{
|
|
qint16 xreal[8], yimag[8];
|
|
|
|
for (int pos = 0; pos < len - 63; ) {
|
|
for (int i = 0; i < 8; i++) {
|
|
xreal[i] = (buf[pos+1] - buf[pos+2] - buf[pos+5] + buf[pos+6]) << 2;
|
|
yimag[i] = (buf[pos+4] + buf[pos+7] - buf[pos+0] - buf[pos+3]) << 2;
|
|
pos += 8;
|
|
}
|
|
|
|
Sample s1( xreal[0], yimag[0] );
|
|
Sample s2( xreal[1], yimag[1] );
|
|
Sample s3( xreal[2], yimag[2] );
|
|
Sample s4( xreal[3], yimag[3] );
|
|
Sample s5( xreal[4], yimag[4] );
|
|
Sample s6( xreal[5], yimag[5] );
|
|
Sample s7( xreal[6], yimag[6] );
|
|
Sample s8( xreal[7], yimag[7] );
|
|
|
|
m_decimator2.myDecimate(&s1, &s2);
|
|
m_decimator2.myDecimate(&s3, &s4);
|
|
m_decimator2.myDecimate(&s5, &s6);
|
|
m_decimator2.myDecimate(&s7, &s8);
|
|
|
|
m_decimator4.myDecimate(&s2, &s4);
|
|
m_decimator4.myDecimate(&s6, &s8);
|
|
|
|
m_decimator8.myDecimate(&s4, &s8);
|
|
|
|
**it = s8;
|
|
(*it)++;
|
|
}
|
|
}
|
|
|
|
#endif /* INCLUDE_GPL_DSP_DECIMATORS_H_ */
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