mirror of https://github.com/f4exb/sdrangel.git
107 lines
3.5 KiB
C++
107 lines
3.5 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 "tetrademod.h"
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#include "dsp/dspcommands.h"
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MessageRegistrator TetraDemod::MsgConfigureTetraDemod::ID("MsgConfigureTetraDemod");
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static FILE* f = NULL;
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TetraDemod::TetraDemod(SampleSink* sampleSink) :
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m_sampleSink(sampleSink)
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{
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m_sampleRate = 500000;
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m_frequency = 0;
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m_nco.setFreq(m_frequency, m_sampleRate);
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m_interpolator.create(32, 32 * m_sampleRate, 36000);
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m_sampleDistanceRemain = (Real)m_sampleRate / 36000.0;
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}
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TetraDemod::~TetraDemod()
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{
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}
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void TetraDemod::configure(MessageQueue* messageQueue)
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{
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Message* cmd = MsgConfigureTetraDemod::create();
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cmd->submit(messageQueue, this);
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}
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void TetraDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly)
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{
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size_t count = end - begin;
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Complex ci;
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bool consumed;
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for(SampleVector::const_iterator it = begin; it < end; ++it) {
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Complex c(it->real() / 32768.0, it->imag() / 32768.0);
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c *= m_nco.nextIQ();
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consumed = false;
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if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &consumed, &ci)) {
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m_sampleBuffer.push_back(Sample(ci.real() * 32768.0, ci.imag() * 32768.0));
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m_sampleDistanceRemain += (Real)m_sampleRate / 36000.0;
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}
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}
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if(f != NULL) {
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fwrite(&m_sampleBuffer[0], m_sampleBuffer.size(), sizeof(m_sampleBuffer[0]), f);
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}
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if(m_sampleSink != NULL)
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m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), positiveOnly);
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m_sampleBuffer.clear();
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}
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void TetraDemod::start()
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{
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}
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void TetraDemod::stop()
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{
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}
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bool TetraDemod::handleMessage(Message* cmd)
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{
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if(cmd->id() == DSPSignalNotification::ID()) {
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DSPSignalNotification* signal = (DSPSignalNotification*)cmd;
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qDebug("%d samples/sec, %lld Hz offset", signal->getSampleRate(), signal->getFrequencyOffset());
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m_sampleRate = signal->getSampleRate();
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m_nco.setFreq(-signal->getFrequencyOffset(), m_sampleRate);
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m_interpolator.create(32, m_sampleRate, 25000 / 2);
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m_sampleDistanceRemain = m_sampleRate / 36000.0;
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cmd->completed();
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return true;
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} else if(cmd->id() == MsgConfigureTetraDemod::ID()) {
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if(f == NULL) {
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f = fopen("/tmp/tetra.iq", "wb");
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qDebug("started writing samples");
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} else {
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fclose(f);
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f = NULL;
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qDebug("stopped writing samples");
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}
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} else {
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return false;
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}
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}
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