mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-09 01:56:05 -05:00
107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
|
|
// written by Christian Daniel //
|
|
// //
|
|
// 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/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <stdio.h>
|
|
#include "tetrademod.h"
|
|
#include "dsp/dspcommands.h"
|
|
|
|
MessageRegistrator TetraDemod::MsgConfigureTetraDemod::ID("MsgConfigureTetraDemod");
|
|
|
|
static FILE* f = NULL;
|
|
|
|
TetraDemod::TetraDemod(SampleSink* sampleSink) :
|
|
m_sampleSink(sampleSink)
|
|
{
|
|
m_sampleRate = 500000;
|
|
m_frequency = 0;
|
|
|
|
m_nco.setFreq(m_frequency, m_sampleRate);
|
|
m_interpolator.create(32, 32 * m_sampleRate, 36000);
|
|
m_sampleDistanceRemain = (Real)m_sampleRate / 36000.0;
|
|
}
|
|
|
|
TetraDemod::~TetraDemod()
|
|
{
|
|
}
|
|
|
|
void TetraDemod::configure(MessageQueue* messageQueue)
|
|
{
|
|
Message* cmd = MsgConfigureTetraDemod::create();
|
|
cmd->submit(messageQueue, this);
|
|
}
|
|
|
|
void TetraDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly)
|
|
{
|
|
size_t count = end - begin;
|
|
|
|
Complex ci;
|
|
bool consumed;
|
|
|
|
for(SampleVector::const_iterator it = begin; it < end; ++it) {
|
|
Complex c(it->real() / 32768.0, it->imag() / 32768.0);
|
|
c *= m_nco.nextIQ();
|
|
|
|
consumed = false;
|
|
if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &consumed, &ci)) {
|
|
m_sampleBuffer.push_back(Sample(ci.real() * 32768.0, ci.imag() * 32768.0));
|
|
|
|
m_sampleDistanceRemain += (Real)m_sampleRate / 36000.0;
|
|
}
|
|
}
|
|
|
|
if(f != NULL) {
|
|
fwrite(&m_sampleBuffer[0], m_sampleBuffer.size(), sizeof(m_sampleBuffer[0]), f);
|
|
}
|
|
|
|
if(m_sampleSink != NULL)
|
|
m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), positiveOnly);
|
|
m_sampleBuffer.clear();
|
|
}
|
|
|
|
void TetraDemod::start()
|
|
{
|
|
}
|
|
|
|
void TetraDemod::stop()
|
|
{
|
|
}
|
|
|
|
bool TetraDemod::handleMessage(Message* cmd)
|
|
{
|
|
if(cmd->id() == DSPSignalNotification::ID()) {
|
|
DSPSignalNotification* signal = (DSPSignalNotification*)cmd;
|
|
qDebug("%d samples/sec, %lld Hz offset", signal->getSampleRate(), signal->getFrequencyOffset());
|
|
m_sampleRate = signal->getSampleRate();
|
|
m_nco.setFreq(-signal->getFrequencyOffset(), m_sampleRate);
|
|
m_interpolator.create(32, m_sampleRate, 25000 / 2);
|
|
m_sampleDistanceRemain = m_sampleRate / 36000.0;
|
|
cmd->completed();
|
|
return true;
|
|
} else if(cmd->id() == MsgConfigureTetraDemod::ID()) {
|
|
if(f == NULL) {
|
|
f = fopen("/tmp/tetra.iq", "wb");
|
|
qDebug("started writing samples");
|
|
} else {
|
|
fclose(f);
|
|
f = NULL;
|
|
qDebug("stopped writing samples");
|
|
}
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|