mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-16 13:21:50 -05:00
287 lines
8.9 KiB
C++
287 lines
8.9 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 <QTime>
|
|
#include <QDebug>
|
|
#include <stdio.h>
|
|
#include <complex.h>
|
|
|
|
#include <dsp/downchannelizer.h>
|
|
#include "dsp/threadedbasebandsamplesink.h"
|
|
#include <device/devicesourceapi.h>
|
|
#include "audio/audiooutput.h"
|
|
#include "dsp/dspengine.h"
|
|
#include "dsp/pidcontroller.h"
|
|
|
|
#include "wfmdemod.h"
|
|
|
|
MESSAGE_CLASS_DEFINITION(WFMDemod::MsgConfigureWFMDemod, Message)
|
|
MESSAGE_CLASS_DEFINITION(WFMDemod::MsgConfigureChannelizer, Message)
|
|
|
|
WFMDemod::WFMDemod(DeviceSourceAPI* deviceAPI) :
|
|
m_deviceAPI(deviceAPI),
|
|
m_squelchOpen(false),
|
|
m_magsq(0.0f),
|
|
m_magsqSum(0.0f),
|
|
m_magsqPeak(0.0f),
|
|
m_magsqCount(0),
|
|
m_movingAverage(40, 0),
|
|
m_sampleSink(0),
|
|
m_audioFifo(250000),
|
|
m_settingsMutex(QMutex::Recursive)
|
|
|
|
{
|
|
setObjectName("WFMDemod");
|
|
|
|
m_channelizer = new DownChannelizer(this);
|
|
m_threadedChannelizer = new ThreadedBasebandSampleSink(m_channelizer, this);
|
|
m_deviceAPI->addThreadedSink(m_threadedChannelizer);
|
|
|
|
m_rfFilter = new fftfilt(-50000.0 / 384000.0, 50000.0 / 384000.0, rfFilterFftLength);
|
|
m_phaseDiscri.setFMScaling(384000/75000);
|
|
|
|
m_audioBuffer.resize(16384);
|
|
m_audioBufferFill = 0;
|
|
|
|
m_movingAverage.resize(16, 0);
|
|
|
|
DSPEngine::instance()->addAudioSink(&m_audioFifo);
|
|
applySettings(m_settings, true);
|
|
}
|
|
|
|
WFMDemod::~WFMDemod()
|
|
{
|
|
if (m_rfFilter)
|
|
{
|
|
delete m_rfFilter;
|
|
}
|
|
|
|
DSPEngine::instance()->removeAudioSink(&m_audioFifo);
|
|
|
|
m_deviceAPI->removeThreadedSink(m_threadedChannelizer);
|
|
delete m_threadedChannelizer;
|
|
delete m_channelizer;
|
|
}
|
|
|
|
void WFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst __attribute__((unused)))
|
|
{
|
|
Complex ci;
|
|
fftfilt::cmplx *rf;
|
|
int rf_out;
|
|
Real demod;
|
|
double msq;
|
|
float fmDev;
|
|
|
|
m_settingsMutex.lock();
|
|
|
|
for (SampleVector::const_iterator it = begin; it != end; ++it)
|
|
{
|
|
//Complex c(it->real() / 32768.0f, it->imag() / 32768.0f);
|
|
Complex c(it->real(), it->imag());
|
|
c *= m_nco.nextIQ();
|
|
|
|
rf_out = m_rfFilter->runFilt(c, &rf); // filter RF before demod
|
|
|
|
for (int i = 0 ; i < rf_out; i++)
|
|
{
|
|
demod = m_phaseDiscri.phaseDiscriminatorDelta(rf[i], msq, fmDev);
|
|
Real magsq = msq / (1<<30);
|
|
|
|
m_movingAverage.feed(magsq);
|
|
m_magsqSum += magsq;
|
|
|
|
if (magsq > m_magsqPeak)
|
|
{
|
|
m_magsqPeak = magsq;
|
|
}
|
|
|
|
m_magsqCount++;
|
|
|
|
if(m_movingAverage.average() >= m_squelchLevel)
|
|
m_squelchState = m_settings.m_rfBandwidth / 20; // decay rate
|
|
|
|
if (m_squelchState > 0)
|
|
{
|
|
m_squelchState--;
|
|
m_squelchOpen = true;
|
|
}
|
|
else
|
|
{
|
|
demod = 0;
|
|
m_squelchOpen = false;
|
|
}
|
|
|
|
if (m_settings.m_audioMute)
|
|
{
|
|
demod = 0;
|
|
}
|
|
|
|
Complex e(demod, 0);
|
|
|
|
if(m_interpolator.decimate(&m_interpolatorDistanceRemain, e, &ci))
|
|
{
|
|
quint16 sample = (qint16)(ci.real() * 3276.8f * m_settings.m_volume);
|
|
m_sampleBuffer.push_back(Sample(sample, sample));
|
|
m_audioBuffer[m_audioBufferFill].l = sample;
|
|
m_audioBuffer[m_audioBufferFill].r = sample;
|
|
++m_audioBufferFill;
|
|
|
|
if(m_audioBufferFill >= m_audioBuffer.size())
|
|
{
|
|
uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 1);
|
|
|
|
if(res != m_audioBufferFill)
|
|
{
|
|
qDebug("WFMDemod::feed: %u/%u audio samples written", res, m_audioBufferFill);
|
|
}
|
|
|
|
m_audioBufferFill = 0;
|
|
}
|
|
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(m_audioBufferFill > 0)
|
|
{
|
|
uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 1);
|
|
|
|
if(res != m_audioBufferFill)
|
|
{
|
|
qDebug("WFMDemod::feed: %u/%u tail samples written", res, m_audioBufferFill);
|
|
}
|
|
|
|
m_audioBufferFill = 0;
|
|
}
|
|
|
|
if(m_sampleSink != NULL)
|
|
{
|
|
m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), false);
|
|
}
|
|
|
|
m_sampleBuffer.clear();
|
|
|
|
m_settingsMutex.unlock();
|
|
}
|
|
|
|
void WFMDemod::start()
|
|
{
|
|
m_squelchState = 0;
|
|
m_audioFifo.clear();
|
|
m_phaseDiscri.reset();
|
|
}
|
|
|
|
void WFMDemod::stop()
|
|
{
|
|
}
|
|
|
|
bool WFMDemod::handleMessage(const Message& cmd)
|
|
{
|
|
if (DownChannelizer::MsgChannelizerNotification::match(cmd))
|
|
{
|
|
DownChannelizer::MsgChannelizerNotification& notif = (DownChannelizer::MsgChannelizerNotification&) cmd;
|
|
|
|
WFMDemodSettings settings = m_settings;
|
|
|
|
settings.m_inputSampleRate = notif.getSampleRate();
|
|
settings.m_inputFrequencyOffset = notif.getFrequencyOffset();
|
|
|
|
applySettings(settings);
|
|
|
|
qDebug() << "WFMDemod::handleMessage: MsgChannelizerNotification: m_inputSampleRate: " << settings.m_inputSampleRate
|
|
<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset;
|
|
|
|
return true;
|
|
}
|
|
else if (MsgConfigureWFMDemod::match(cmd))
|
|
{
|
|
MsgConfigureWFMDemod& cfg = (MsgConfigureWFMDemod&) cmd;
|
|
|
|
WFMDemodSettings settings = cfg.getSettings();
|
|
|
|
// These settings are set with DownChannelizer::MsgChannelizerNotification
|
|
settings.m_inputSampleRate = m_settings.m_inputSampleRate;
|
|
settings.m_inputFrequencyOffset = m_settings.m_inputFrequencyOffset;
|
|
|
|
applySettings(settings, cfg.getForce());
|
|
|
|
qDebug() << "WFMDemod::handleMessage: MsgConfigureWFMDemod:"
|
|
<< " m_rfBandwidth: " << settings.m_rfBandwidth
|
|
<< " m_afBandwidth: " << settings.m_afBandwidth
|
|
<< " m_volume: " << settings.m_volume
|
|
<< " m_squelch: " << settings.m_squelch
|
|
<< " m_copyAudioToUDP: " << settings.m_copyAudioToUDP
|
|
<< " m_udpAddress: " << settings.m_udpAddress
|
|
<< " m_udpPort: " << settings.m_udpPort
|
|
<< " force: " << cfg.getForce();
|
|
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
if (m_sampleSink != 0)
|
|
{
|
|
return m_sampleSink->handleMessage(cmd);
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
void WFMDemod::applySettings(const WFMDemodSettings& settings, bool force)
|
|
{
|
|
if((settings.m_inputFrequencyOffset != m_settings.m_inputFrequencyOffset) ||
|
|
(settings.m_inputSampleRate != m_settings.m_inputSampleRate) || force)
|
|
{
|
|
qDebug() << "WFMDemod::applySettings: m_nco.setFreq";
|
|
m_nco.setFreq(-settings.m_inputFrequencyOffset, settings.m_inputSampleRate);
|
|
}
|
|
|
|
if((settings.m_inputSampleRate != m_settings.m_inputSampleRate) ||
|
|
(settings.m_audioSampleRate != m_settings.m_audioSampleRate) ||
|
|
(settings.m_afBandwidth != m_settings.m_afBandwidth) ||
|
|
(settings.m_rfBandwidth != m_settings.m_rfBandwidth) || force)
|
|
{
|
|
m_settingsMutex.lock();
|
|
qDebug() << "WFMDemod::applySettings: m_interpolator.create";
|
|
m_interpolator.create(16, settings.m_inputSampleRate, settings.m_afBandwidth);
|
|
m_interpolatorDistanceRemain = (Real) settings.m_inputSampleRate / (Real) settings.m_audioSampleRate;
|
|
m_interpolatorDistance = (Real) settings.m_inputSampleRate / (Real) settings.m_audioSampleRate;
|
|
qDebug() << "WFMDemod::applySettings: m_rfFilter->create_filter";
|
|
Real lowCut = -(settings.m_rfBandwidth / 2.0) / settings.m_inputSampleRate;
|
|
Real hiCut = (settings.m_rfBandwidth / 2.0) / settings.m_inputSampleRate;
|
|
m_rfFilter->create_filter(lowCut, hiCut);
|
|
m_fmExcursion = settings.m_rfBandwidth / (Real) settings.m_inputSampleRate;
|
|
m_phaseDiscri.setFMScaling(1.0f/m_fmExcursion);
|
|
qDebug("WFMDemod::applySettings: m_fmExcursion: %f", m_fmExcursion);
|
|
m_settingsMutex.unlock();
|
|
}
|
|
|
|
if ((settings.m_squelch != m_settings.m_squelch) || force)
|
|
{
|
|
qDebug() << "WFMDemod::applySettings: set m_squelchLevel";
|
|
m_squelchLevel = pow(10.0, settings.m_squelch / 20.0);
|
|
m_squelchLevel *= m_squelchLevel;
|
|
}
|
|
|
|
m_settings = settings;
|
|
}
|