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Deep redesign: fixed RTLSDR decimation by exporting BladeRF decimators into a generalized templatized class (Decimators)

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f4exb 2015-08-26 02:42:31 +02:00
parent 5a0668f9ec
commit b185ef0558
4 changed files with 507 additions and 106 deletions
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1
CMakeLists.txt
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@ -127,6 +127,7 @@ set(sdrbase_HEADERS
include-gpl/dsp/channelizer.h
include/dsp/channelmarker.h
include-gpl/dsp/complex.h
include-gpl/dsp/decimators.h
include-gpl/dsp/dspcommands.h
include-gpl/dsp/dspengine.h
include/dsp/dsptypes.h

498
include-gpl/dsp/decimators.h Normal file
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@ -0,0 +1,498 @@
///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2015 Edouard Griffiths, F4EXB //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef INCLUDE_GPL_DSP_DECIMATORS_H_
#define INCLUDE_GPL_DSP_DECIMATORS_H_
#include "dsp/dsptypes.h"
#include "dsp/inthalfbandfilter.h"
template<typename T>
class Decimators
{
public:
void decimate1(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate2_u(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate2(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate2_sup(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate2_cen(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate4(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate4_sup(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate4_cen(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate8(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate8_sup(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate8_cen(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate16(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate16_sup(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate16_cen(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate32(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate32_sup(SampleVector::iterator* it, const T* buf, qint32 len);
void decimate32_cen(SampleVector::iterator* it, const T* buf, qint32 len);
private:
IntHalfbandFilter m_decimator2; // 1st stages
IntHalfbandFilter m_decimator4; // 2nd stages
IntHalfbandFilter m_decimator8; // 3rd stages
IntHalfbandFilter m_decimator16; // 4th stages
IntHalfbandFilter m_decimator32; // 5th stages
};
template<typename T>
void Decimators<T>::decimate1(SampleVector::iterator* it, const T* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len; pos += 2) {
xreal = buf[pos+0];
yimag = buf[pos+1];
Sample s( xreal * 16, yimag * 16 ); // shift by 4 bit positions (signed)
**it = s;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate2_u(SampleVector::iterator* it, const T* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len - 7; pos += 8) {
xreal = buf[pos+0] - buf[pos+3];
yimag = buf[pos+1] + buf[pos+2] - 255;
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
xreal = buf[pos+7] - buf[pos+4];
yimag = 255 - buf[pos+5] - buf[pos+6];
Sample t( xreal << 3, yimag << 3 );
**it = t;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate2(SampleVector::iterator* it, const T* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len - 7; pos += 8) {
xreal = buf[pos+0] - buf[pos+3];
yimag = buf[pos+1] + buf[pos+2];
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
xreal = buf[pos+7] - buf[pos+4];
yimag = - buf[pos+5] - buf[pos+6];
Sample t( xreal << 3, yimag << 3 );
**it = t;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate2_sup(SampleVector::iterator* it, const T* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len - 7; pos += 8) {
xreal = buf[pos+1] - buf[pos+2];
yimag = - buf[pos+0] - buf[pos+3];
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
xreal = buf[pos+6] - buf[pos+5];
yimag = buf[pos+4] + buf[pos+7];
Sample t( xreal << 3, yimag << 3 );
**it = t;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate2_cen(SampleVector::iterator* it, const T* buf, qint32 len)
{
for (int pos = 0; pos < len - 3; pos += 4) {
Sample s1(buf[pos+0] << 3, buf[pos+1] << 3);
Sample s2(buf[pos+2] << 3, buf[pos+3] << 3);
m_decimator2.myDecimate(&s1, &s2);
**it = s2;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate4_cen(SampleVector::iterator* it, const T* buf, qint32 len)
{
for (int pos = 0; pos < len - 7; pos += 8) {
Sample s1(buf[pos+0] << 4, buf[pos+1] << 4);
Sample s2(buf[pos+2] << 4, buf[pos+3] << 4);
Sample s3(buf[pos+4] << 4, buf[pos+5] << 4);
Sample s4(buf[pos+6] << 4, buf[pos+7] << 4);
m_decimator2.myDecimate(&s1, &s2);
m_decimator2.myDecimate(&s3, &s4);
m_decimator4.myDecimate(&s2, &s4);
**it = s4;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate8_cen(SampleVector::iterator* it, const T* buf, qint32 len)
{
for (int pos = 0; pos < len - 15; pos += 16) {
Sample s1(buf[pos+0] << 4, buf[pos+1] << 4);
Sample s2(buf[pos+2] << 4, buf[pos+3] << 4);
Sample s3(buf[pos+4] << 4, buf[pos+5] << 4);
Sample s4(buf[pos+6] << 4, buf[pos+7] << 4);
Sample s5(buf[pos+8] << 4, buf[pos+9] << 4);
Sample s6(buf[pos+10] << 4, buf[pos+11] << 4);
Sample s7(buf[pos+12] << 4, buf[pos+13] << 4);
Sample s8(buf[pos+14] << 4, buf[pos+15] << 4);
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>::decimate16_cen(SampleVector::iterator* it, const T* buf, qint32 len)
{
for (int pos = 0; pos < len - 31; pos += 32) {
Sample s1(buf[pos+0] << 4, buf[pos+1] << 4);
Sample s2(buf[pos+2] << 4, buf[pos+3] << 4);
Sample s3(buf[pos+4] << 4, buf[pos+5] << 4);
Sample s4(buf[pos+6] << 4, buf[pos+7] << 4);
Sample s5(buf[pos+8] << 4, buf[pos+9] << 4);
Sample s6(buf[pos+10] << 4, buf[pos+11] << 4);
Sample s7(buf[pos+12] << 4, buf[pos+13] << 4);
Sample s8(buf[pos+14] << 4, buf[pos+15] << 4);
Sample s9(buf[pos+16] << 4, buf[pos+17] << 4);
Sample s10(buf[pos+18] << 4, buf[pos+19] << 4);
Sample s11(buf[pos+20] << 4, buf[pos+21] << 4);
Sample s12(buf[pos+22] << 4, buf[pos+23] << 4);
Sample s13(buf[pos+24] << 4, buf[pos+25] << 4);
Sample s14(buf[pos+26] << 4, buf[pos+27] << 4);
Sample s15(buf[pos+28] << 4, buf[pos+29] << 4);
Sample s16(buf[pos+30] << 4, buf[pos+31] << 4);
m_decimator2.myDecimate(&s1, &s2);
m_decimator2.myDecimate(&s3, &s4);
m_decimator2.myDecimate(&s5, &s6);
m_decimator2.myDecimate(&s7, &s8);
m_decimator2.myDecimate(&s9, &s10);
m_decimator2.myDecimate(&s11, &s12);
m_decimator2.myDecimate(&s13, &s14);
m_decimator2.myDecimate(&s15, &s16);
m_decimator4.myDecimate(&s2, &s4);
m_decimator4.myDecimate(&s6, &s8);
m_decimator4.myDecimate(&s10, &s12);
m_decimator4.myDecimate(&s14, &s16);
m_decimator8.myDecimate(&s4, &s8);
m_decimator8.myDecimate(&s12, &s16);
m_decimator16.myDecimate(&s8, &s16);
**it = s16;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate32_cen(SampleVector::iterator* it, const T* buf, qint32 len)
{
for (int pos = 0; pos < len - 63; pos += 64) {
Sample s1(buf[pos+0] << 4, buf[pos+1] << 4);
Sample s2(buf[pos+2] << 4, buf[pos+3] << 4);
Sample s3(buf[pos+4] << 4, buf[pos+5] << 4);
Sample s4(buf[pos+6] << 4, buf[pos+7] << 4);
Sample s5(buf[pos+8] << 4, buf[pos+9] << 4);
Sample s6(buf[pos+10] << 4, buf[pos+11] << 4);
Sample s7(buf[pos+12] << 4, buf[pos+13] << 4);
Sample s8(buf[pos+14] << 4, buf[pos+15] << 4);
Sample s9(buf[pos+16] << 4, buf[pos+17] << 4);
Sample s10(buf[pos+18] << 4, buf[pos+19] << 4);
Sample s11(buf[pos+20] << 4, buf[pos+21] << 4);
Sample s12(buf[pos+22] << 4, buf[pos+23] << 4);
Sample s13(buf[pos+24] << 4, buf[pos+25] << 4);
Sample s14(buf[pos+26] << 4, buf[pos+27] << 4);
Sample s15(buf[pos+28] << 4, buf[pos+29] << 4);
Sample s16(buf[pos+30] << 4, buf[pos+31] << 4);
Sample s17(buf[pos+32] << 4, buf[pos+33] << 4);
Sample s18(buf[pos+34] << 4, buf[pos+35] << 4);
Sample s19(buf[pos+36] << 4, buf[pos+37] << 4);
Sample s20(buf[pos+38] << 4, buf[pos+39] << 4);
Sample s21(buf[pos+40] << 4, buf[pos+41] << 4);
Sample s22(buf[pos+42] << 4, buf[pos+43] << 4);
Sample s23(buf[pos+44] << 4, buf[pos+45] << 4);
Sample s24(buf[pos+46] << 4, buf[pos+47] << 4);
Sample s25(buf[pos+48] << 4, buf[pos+49] << 4);
Sample s26(buf[pos+50] << 4, buf[pos+51] << 4);
Sample s27(buf[pos+52] << 4, buf[pos+53] << 4);
Sample s28(buf[pos+54] << 4, buf[pos+55] << 4);
Sample s29(buf[pos+56] << 4, buf[pos+57] << 4);
Sample s30(buf[pos+58] << 4, buf[pos+59] << 4);
Sample s31(buf[pos+60] << 4, buf[pos+61] << 4);
Sample s32(buf[pos+62] << 4, buf[pos+63] << 4);
m_decimator2.myDecimate(&s1, &s2);
m_decimator2.myDecimate(&s3, &s4);
m_decimator2.myDecimate(&s5, &s6);
m_decimator2.myDecimate(&s7, &s8);
m_decimator2.myDecimate(&s9, &s10);
m_decimator2.myDecimate(&s11, &s12);
m_decimator2.myDecimate(&s13, &s14);
m_decimator2.myDecimate(&s15, &s16);
m_decimator2.myDecimate(&s17, &s18);
m_decimator2.myDecimate(&s19, &s20);
m_decimator2.myDecimate(&s21, &s22);
m_decimator2.myDecimate(&s23, &s24);
m_decimator2.myDecimate(&s25, &s26);
m_decimator2.myDecimate(&s27, &s28);
m_decimator2.myDecimate(&s29, &s30);
m_decimator2.myDecimate(&s31, &s32);
m_decimator4.myDecimate(&s2, &s4);
m_decimator4.myDecimate(&s6, &s8);
m_decimator4.myDecimate(&s10, &s12);
m_decimator4.myDecimate(&s14, &s16);
m_decimator4.myDecimate(&s18, &s20);
m_decimator4.myDecimate(&s22, &s24);
m_decimator4.myDecimate(&s26, &s28);
m_decimator4.myDecimate(&s30, &s32);
m_decimator8.myDecimate(&s4, &s8);
m_decimator8.myDecimate(&s12, &s16);
m_decimator8.myDecimate(&s20, &s24);
m_decimator8.myDecimate(&s28, &s32);
m_decimator16.myDecimate(&s8, &s16);
m_decimator16.myDecimate(&s24, &s32);
m_decimator32.myDecimate(&s16, &s32);
**it = s32;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate4(SampleVector::iterator* it, const T* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len - 7; pos += 8) {
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s( xreal << 2, yimag << 2 ); // was shift 3
**it = s;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate4_sup(SampleVector::iterator* it, const T* buf, qint32 len)
{
// Sup (USB):
// x y x y x y x y / x -> 1,-2,-5,6 / y -> -0,-3,4,7
// [ rotate: 1, 0, -2, 3, -5, -4, 6, -7]
// Inf (LSB):
// x y x y x y x y / x -> 0,-3,-4,7 / y -> 1,2,-5,-6
// [ rotate: 0, 1, -3, 2, -4, -5, 7, -6]
qint16 xreal, yimag;
for (int pos = 0; pos < len - 7; pos += 8) {
xreal = buf[pos+1] - buf[pos+2] - buf[pos+5] + buf[pos+6];
yimag = - buf[pos+0] - buf[pos+3] + buf[pos+4] + buf[pos+7];
//xreal = buf[pos+0] - buf[pos+3] - buf[pos+4] + buf[pos+7];
//yimag = buf[pos+1] + buf[pos+2] - buf[pos+5] - buf[pos+6];
Sample s( xreal << 2, yimag << 2 ); // was shift 3
**it = s;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate8(SampleVector::iterator* it, const T* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len - 15; pos += 8) {
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s1( xreal << 2, yimag << 2 ); // was shift 3
pos += 8;
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s2( xreal << 2, yimag << 2 ); // was shift 3
m_decimator2.myDecimate(&s1, &s2);
**it = s2;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate8_sup(SampleVector::iterator* it, const T* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len - 15; pos += 8) {
xreal = buf[pos+1] - buf[pos+2] - buf[pos+5] + buf[pos+6];
yimag = - buf[pos+0] - buf[pos+3] + buf[pos+4] + buf[pos+7];
Sample s1( xreal << 2, yimag << 2 ); // was shift 3
pos += 8;
xreal = buf[pos+1] - buf[pos+2] - buf[pos+5] + buf[pos+6];
yimag = - buf[pos+0] - buf[pos+3] + buf[pos+4] + buf[pos+7];
Sample s2( xreal << 2, yimag << 2 ); // was shift 3
m_decimator2.myDecimate(&s1, &s2);
**it = s2;
(*it)++;
}
}
template<typename T>
void Decimators<T>::decimate16(SampleVector::iterator* it, const T* buf, qint32 len)
{
// Offset tuning: 4x downsample and rotate, then
// downsample 4x more. [ rotate: 0, 1, -3, 2, -4, -5, 7, -6]
qint16 xreal[4], yimag[4];
for (int pos = 0; pos < len - 31; ) {
for (int i = 0; i < 4; i++) {
xreal[i] = (buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4]) << 2; // was shift 4
yimag[i] = (buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6]) << 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>::decimate16_sup(SampleVector::iterator* it, const T* buf, qint32 len)
{
// Offset tuning: 4x downsample and rotate, then
// 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_ */

103
plugins/samplesource/rtlsdr/rtlsdrthread.cpp
View File

@ -80,90 +80,6 @@ void RTLSDRThread::run()
m_running = false;
}
void RTLSDRThread::decimate1(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len; pos += 2) {
xreal = buf[pos+0];
yimag = buf[pos+1];
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
}
}
void RTLSDRThread::decimate2(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len - 7; pos += 8) {
xreal = buf[pos+0] - buf[pos+3];
yimag = buf[pos+1] + buf[pos+2] - 255;
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
xreal = buf[pos+7] - buf[pos+4];
yimag = 255 - buf[pos+5] - buf[pos+6];
Sample t( xreal << 3, yimag << 3 );
**it = t;
(*it)++;
}
}
void RTLSDRThread::decimate4(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len - 7; pos += 8) {
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
}
}
void RTLSDRThread::decimate8(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len - 15; pos += 8) {
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s1( xreal << 3, yimag << 3 );
pos += 8;
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s2( xreal << 3, yimag << 3 );
m_decimator2.myDecimate(&s1, &s2);
**it = s2;
(*it)++;
}
}
void RTLSDRThread::decimate16(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
// Offset tuning: 4x downsample and rotate, then
// downsample 4x more. [ rotate: 0, 1, -3, 2, -4, -5, 7, -6]
qint16 xreal[4], yimag[4];
for (int pos = 0; pos < len - 31; ) {
for (int i = 0; i < 4; i++) {
xreal[i] = (buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4]) << 4;
yimag[i] = (buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6]) << 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)++;
}
}
// Decimate according to specified log2 (ex: log2=4 => decim=16)
void RTLSDRThread::callback(const quint8* buf, qint32 len)
{
@ -172,33 +88,24 @@ void RTLSDRThread::callback(const quint8* buf, qint32 len)
switch (m_log2Decim)
{
case 0:
decimate1(&it, buf, len);
m_decimators.decimate1(&it, buf, len);
break;
case 1:
decimate2(&it, buf, len);
m_decimators.decimate2(&it, buf, len);
break;
case 2:
decimate4(&it, buf, len);
m_decimators.decimate4(&it, buf, len);
break;
case 3:
decimate8(&it, buf, len);
m_decimators.decimate8(&it, buf, len);
break;
case 4:
decimate16(&it, buf, len);
m_decimators.decimate16(&it, buf, len);
break;
default:
break;
}
/*
if (m_samplerate < 800000)
decimate4(&it, buf, len);
else if ((m_samplerate == 1152000)||(m_samplerate == 2048000))
decimate8(&it, buf, len);
else
decimate16(&it, buf, len);
*/
m_sampleFifo->write(m_convertBuffer.begin(), it);
if(!m_running)

11
plugins/samplesource/rtlsdr/rtlsdrthread.h
View File

@ -23,7 +23,8 @@
#include <QWaitCondition>
#include <rtl-sdr.h>
#include "dsp/samplefifo.h"
#include "dsp/inthalfbandfilter.h"
//#include "dsp/inthalfbandfilter.h"
#include "dsp/decimators.h"
class RTLSDRThread : public QThread {
Q_OBJECT
@ -49,15 +50,9 @@ private:
int m_samplerate;
unsigned int m_log2Decim;
IntHalfbandFilter m_decimator2;
IntHalfbandFilter m_decimator4;
Decimators<quint8> m_decimators;
void run();
void decimate1(SampleVector::iterator* it, const quint8* buf, qint32 len);
void decimate2(SampleVector::iterator* it, const quint8* buf, qint32 len);
void decimate4(SampleVector::iterator* it, const quint8* buf, qint32 len);
void decimate8(SampleVector::iterator* it, const quint8* buf, qint32 len);
void decimate16(SampleVector::iterator* it, const quint8* buf, qint32 len);
void callback(const quint8* buf, qint32 len);
static void callbackHelper(unsigned char* buf, uint32_t len, void* ctx);