mirror of
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121 lines
3.2 KiB
C++
121 lines
3.2 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 FCD_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(FCD_BLOCKSIZE),
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m_sampleFifo(sampleFifo),
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m_samplerate(288000),
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m_log2Decim(4)
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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::setSamplerate(int samplerate)
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{
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m_samplerate = samplerate;
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}
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void RTLSDRThread::setLog2Decimation(unsigned int log2_decim)
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{
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m_log2Decim = log2_decim;
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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, 32, FCD_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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// Decimate according to specified log2 (ex: log2=4 => decim=16)
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void RTLSDRThread::callback(const quint8* buf, qint32 len)
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{
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SampleVector::iterator it = m_convertBuffer.begin();
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switch (m_log2Decim)
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{
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case 0:
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m_decimators.decimate1(&it, buf, len);
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break;
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case 1:
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m_decimators.decimate2(&it, buf, len);
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break;
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case 2:
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m_decimators.decimate4(&it, buf, len);
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break;
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case 3:
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m_decimators.decimate8(&it, buf, len);
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break;
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case 4:
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m_decimators.decimate16(&it, buf, len);
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break;
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default:
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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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