mirror of
https://github.com/f4exb/sdrangel.git
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246 lines
6.6 KiB
C++
246 lines
6.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// written by Christian Daniel //
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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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#include <stdio.h>
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#include <errno.h>
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#include "rtlsdrthread.h"
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#include "dsp/samplefifo.h"
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#define BLOCKSIZE 16384
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RTLSDRThread::RTLSDRThread(rtlsdr_dev_t* dev, SampleFifo* sampleFifo, QObject* parent) :
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QThread(parent),
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m_running(false),
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m_dev(dev),
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m_convertBuffer(BLOCKSIZE),
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m_sampleFifo(sampleFifo),
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m_decimation(2)
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{
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}
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RTLSDRThread::~RTLSDRThread()
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{
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stopWork();
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}
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void RTLSDRThread::startWork()
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{
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m_startWaitMutex.lock();
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start();
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while(!m_running)
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m_startWaiter.wait(&m_startWaitMutex, 100);
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m_startWaitMutex.unlock();
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}
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void RTLSDRThread::stopWork()
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{
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m_running = false;
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wait();
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}
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void RTLSDRThread::setDecimation(int decimation)
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{
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m_decimation = decimation;
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}
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void RTLSDRThread::run()
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{
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int res;
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m_running = true;
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m_startWaiter.wakeAll();
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while(m_running) {
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if((res = rtlsdr_read_async(m_dev, &RTLSDRThread::callbackHelper, this, 16, 2 * BLOCKSIZE)) < 0) {
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qCritical("RTLSDRThread: async error: %s", strerror(errno));
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break;
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}
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}
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m_running = false;
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}
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#if 0
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void RTLSDRThread::decimate2(SampleVector::iterator* it, const quint8* buf, qint32 len)
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{
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for(int pos = 0; pos < len; pos += 2) {
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Sample s((((qint8)buf[pos]) - 128) << 8, (((qint8)buf[pos + 1]) - 128) << 8);
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if(m_decimator2.workDecimateCenter(&s)) {
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**it = s;
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++(*it);
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}
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}
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}
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void RTLSDRThread::decimate4(SampleVector::iterator* it, const quint8* buf, qint32 len)
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{
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for(int pos = 0; pos < len; pos += 2) {
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Sample s((((qint8)buf[pos]) - 128) << 8, (((qint8)buf[pos + 1]) - 128) << 8);
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if(m_decimator2.workDecimateCenter(&s)) {
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if(m_decimator4.workDecimateCenter(&s)) {
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**it = s;
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++(*it);
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}
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}
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}
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}
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void RTLSDRThread::decimate8(SampleVector::iterator* it, const quint8* buf, qint32 len)
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{
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for(int pos = 0; pos < len; pos += 2) {
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Sample s((((qint8)buf[pos]) - 128) << 8, (((qint8)buf[pos + 1]) - 128) << 8);
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if(m_decimator2.workDecimateCenter(&s)) {
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if(m_decimator4.workDecimateCenter(&s)) {
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if(m_decimator8.workDecimateCenter(&s)) {
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**it = s;
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++(*it);
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}
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}
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}
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}
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}
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void RTLSDRThread::decimate16(SampleVector::iterator* it, const quint8* buf, qint32 len)
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{
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for(int pos = 0; pos < len; pos += 2) {
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Sample s((((qint8)buf[pos]) - 128) << 8, (((qint8)buf[pos + 1]) - 128) << 8);
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if(m_decimator2.workDecimateCenter(&s)) {
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if(m_decimator4.workDecimateCenter(&s)) {
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if(m_decimator8.workDecimateCenter(&s)) {
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if(m_decimator16.workDecimateCenter(&s)) {
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**it = s;
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++(*it);
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}
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}
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}
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}
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}
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}
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#else
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void RTLSDRThread::decimate2(SampleVector::iterator* it, const quint8* 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 << 5, yimag << 5 );
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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 << 5, yimag << 5 );
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**it = t;
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(*it)++;
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}
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}
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void RTLSDRThread::decimate4(SampleVector::iterator* it, const quint8* 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 << 5, yimag << 5 );
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**it = s;
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(*it)++;
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}
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}
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void RTLSDRThread::decimate8(SampleVector::iterator* it, const quint8* 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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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 << 4, yimag << 4 );
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**it = s;
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(*it)++;
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}
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}
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void RTLSDRThread::decimate16(SampleVector::iterator* it, const quint8* 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, yimag;
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for (int step = 0; step < len - 31; step +=32) {
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xreal = yimag = 0;
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for (int pos = step; pos < step + 32; 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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}
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Sample s( xreal << 4, yimag << 4 );
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**it = s;
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(*it)++;
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}
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}
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#endif
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void RTLSDRThread::callback(const quint8* buf, qint32 len)
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{
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qint16 xreal, yimag, phase;
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SampleVector::iterator it = m_convertBuffer.begin();
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switch(m_decimation) {
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case 0: // 1:1 = no decimation
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// just rotation
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phase = -1;
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for (int pos = 0; pos < len + 3; pos += 4) {
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phase *= -1;
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xreal = phase * (buf[pos+0] - 127);
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yimag = phase * (buf[pos+1] - 127);
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*it++ = Sample( xreal<<6,yimag<<6);
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xreal = phase * (128 - buf[pos+3]);
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yimag = phase * (buf[pos+2] - 127);
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*it++ = Sample( xreal<<6,yimag<<6);
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}
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break;
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case 1: // 1:2
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decimate2(&it, buf, len);
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break;
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case 2: // 1:4
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decimate4(&it, buf, len);
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break;
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case 3: // 1:8
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decimate8(&it, buf, len);
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break;
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case 4: // 1:16
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decimate16(&it, buf, len);
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break;
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}
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m_sampleFifo->write(m_convertBuffer.begin(), it);
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if(!m_running)
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rtlsdr_cancel_async(m_dev);
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}
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void RTLSDRThread::callbackHelper(unsigned char* buf, uint32_t len, void* ctx)
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{
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RTLSDRThread* thread = (RTLSDRThread*)ctx;
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thread->callback(buf, len);
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}
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