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sdrangel/plugins/channelrx/demodwfm/wfmdemodsink.cpp
2024-04-11 23:31:34 +02:00

267 lines
10 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019-2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// //
// 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 //
// (at your option) any later version. //
// //
// 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 <complex.h>
#include <QTime>
#include <QDebug>
#include "dsp/datafifo.h"
#include "util/messagequeue.h"
#include "maincore.h"
#include "wfmdemodsink.h"
const unsigned int WFMDemodSink::m_rfFilterFftLength = 1024;
WFMDemodSink::WFMDemodSink() :
m_channelSampleRate(384000),
m_channelFrequencyOffset(0),
m_audioSampleRate(48000),
m_squelchState(0),
m_squelchOpen(false),
m_magsq(0.0f),
m_magsqSum(0.0f),
m_magsqPeak(0.0f),
m_magsqCount(0),
m_audioFifo(250000)
{
m_rfFilter = new fftfilt(-50000.0 / 384000.0, 50000.0 / 384000.0, m_rfFilterFftLength);
m_phaseDiscri.setFMScaling(384000/75000);
m_audioBuffer.resize(1<<14);
m_audioBufferFill = 0;
m_demodBuffer.resize(1<<12);
m_demodBufferFill = 0;
applySettings(m_settings, true);
applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
}
WFMDemodSink::~WFMDemodSink()
{
delete m_rfFilter;
}
void WFMDemodSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
{
Complex ci;
fftfilt::cmplx *rf;
int rf_out;
Real demod;
double msq;
float fmDev;
for (SampleVector::const_iterator it = begin; it != end; ++it)
{
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++)
{
msq = rf[i].real()*rf[i].real() + rf[i].imag()*rf[i].imag();
Real magsq = msq / (SDR_RX_SCALED*SDR_RX_SCALED);
m_magsqSum += magsq;
m_movingAverage(magsq);
if (magsq > m_magsqPeak) {
m_magsqPeak = magsq;
}
m_magsqCount++;
if (magsq >= m_squelchLevel)
{
if (m_squelchState < m_settings.m_rfBandwidth / 10) { // twice attack and decay rate
m_squelchState++;
}
}
else
{
if (m_squelchState > 0) {
m_squelchState--;
}
}
m_squelchOpen = (m_squelchState > (m_settings.m_rfBandwidth / 20));
if (m_squelchOpen && !m_settings.m_audioMute) { // squelch open and not mute
demod = m_phaseDiscri.phaseDiscriminatorDelta(rf[i], msq, fmDev);
} else {
demod = 0;
}
Complex e(demod, 0);
if (m_interpolator.decimate(&m_interpolatorDistanceRemain, e, &ci))
{
qint16 sample = (qint16)(ci.real() * 3276.8f * m_settings.m_volume);
m_audioBuffer[m_audioBufferFill].l = sample;
m_audioBuffer[m_audioBufferFill].r = sample;
++m_audioBufferFill;
if(m_audioBufferFill >= m_audioBuffer.size())
{
std::size_t res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], std::min(m_audioBufferFill, m_audioBuffer.size()));
if (res != m_audioBufferFill) {
qDebug("WFMDemodSink::feed: %lu/%lu audio samples written", res, m_audioBufferFill);
}
m_audioBufferFill = 0;
}
m_interpolatorDistanceRemain += m_interpolatorDistance;
m_demodBuffer[m_demodBufferFill] = sample;
++m_demodBufferFill;
if (m_demodBufferFill >= m_demodBuffer.size())
{
QList<ObjectPipe*> dataPipes;
MainCore::instance()->getDataPipes().getDataPipes(m_channel, "demod", dataPipes);
if (dataPipes.size() > 0)
{
QList<ObjectPipe*>::iterator it = dataPipes.begin();
for (; it != dataPipes.end(); ++it)
{
DataFifo *fifo = qobject_cast<DataFifo*>((*it)->m_element);
if (fifo) {
fifo->write((quint8*) &m_demodBuffer[0], m_demodBuffer.size() * sizeof(qint16), DataFifo::DataTypeI16);
}
}
}
m_demodBufferFill = 0;
}
}
}
}
}
void WFMDemodSink::applyAudioSampleRate(int sampleRate)
{
if (sampleRate < 0)
{
qWarning("WFMDemodSink::applyAudioSampleRate: invalid sample rate: %d", sampleRate);
return;
}
qDebug("WFMDemodSink::applyAudioSampleRate: %u", sampleRate);
m_interpolator.create(16, m_channelSampleRate, m_settings.m_afBandwidth);
m_interpolatorDistanceRemain = (Real) m_channelSampleRate / sampleRate;
m_interpolatorDistance = (Real) m_channelSampleRate / (Real) sampleRate;
m_audioSampleRate = sampleRate;
QList<ObjectPipe*> pipes;
MainCore::instance()->getMessagePipes().getMessagePipes(m_channel, "reportdemod", pipes);
if (pipes.size() > 0)
{
for (const auto& pipe : pipes)
{
MessageQueue* messageQueue = qobject_cast<MessageQueue*>(pipe->m_element);
MainCore::MsgChannelDemodReport *msg = MainCore::MsgChannelDemodReport::create(m_channel, sampleRate);
messageQueue->push(msg);
}
}
}
void WFMDemodSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
{
qDebug() << "WFMDemodSink::applyChannelSettings:"
<< " channelSampleRate: " << channelSampleRate
<< " channelFrequencyOffset: " << channelFrequencyOffset;
if((channelFrequencyOffset != m_channelFrequencyOffset) ||
(channelSampleRate != m_channelSampleRate) || force)
{
m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
}
if ((channelSampleRate != m_channelSampleRate) || force)
{
qDebug() << "WFMDemod::applyChannelSettings: m_interpolator.create";
m_interpolator.create(16, channelSampleRate, m_settings.m_afBandwidth);
m_interpolatorDistanceRemain = (Real) channelSampleRate / (Real) m_audioSampleRate;
m_interpolatorDistance = (Real) channelSampleRate / (Real) m_audioSampleRate;
qDebug() << "WFMDemod::applySettings: m_rfFilter->create_filter";
Real lowCut = -(m_settings.m_rfBandwidth / 2.0) / channelSampleRate;
Real hiCut = (m_settings.m_rfBandwidth / 2.0) / channelSampleRate;
m_rfFilter->create_filter(lowCut, hiCut);
//m_fmExcursion = m_settings.m_rfBandwidth / (Real) channelSampleRate;
m_phaseDiscri.setFMScaling((float) channelSampleRate / ((float) 2*m_fmExcursion));
qDebug("WFMDemod::applySettings: m_fmExcursion: %f", m_fmExcursion);
}
m_channelSampleRate = channelSampleRate;
m_channelFrequencyOffset = channelFrequencyOffset;
}
void WFMDemodSink::applySettings(const WFMDemodSettings& settings, bool force)
{
qDebug() << "WFMDemodSink::applySettings:"
<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
<< " m_rfBandwidth: " << settings.m_rfBandwidth
<< " m_afBandwidth: " << settings.m_afBandwidth
<< " m_volume: " << settings.m_volume
<< " m_squelch: " << settings.m_squelch
<< " m_audioDeviceName: " << settings.m_audioDeviceName
<< " m_audioMute: " << settings.m_audioMute
<< " m_streamIndex: " << settings.m_streamIndex
<< " m_useReverseAPI: " << settings.m_useReverseAPI
<< " m_reverseAPIAddress: " << settings.m_reverseAPIAddress
<< " m_reverseAPIPort: " << settings.m_reverseAPIPort
<< " m_reverseAPIDeviceIndex: " << settings.m_reverseAPIDeviceIndex
<< " m_reverseAPIChannelIndex: " << settings.m_reverseAPIChannelIndex
<< " force: " << force;
if((settings.m_afBandwidth != m_settings.m_afBandwidth) ||
(settings.m_rfBandwidth != m_settings.m_rfBandwidth) || force)
{
qDebug() << "WFMDemodSink::applySettings: m_interpolator.create";
m_interpolator.create(16, m_channelSampleRate, settings.m_afBandwidth);
m_interpolatorDistanceRemain = (Real) m_channelSampleRate / (Real) m_audioSampleRate;
m_interpolatorDistance = (Real) m_channelSampleRate / (Real) m_audioSampleRate;
qDebug() << "WFMDemodSink::applySettings: m_rfFilter->create_filter";
Real lowCut = -(settings.m_rfBandwidth / 2.0) / m_channelSampleRate;
Real hiCut = (settings.m_rfBandwidth / 2.0) / m_channelSampleRate;
m_rfFilter->create_filter(lowCut, hiCut);
m_fmExcursion = (settings.m_rfBandwidth / 2) - m_settings.m_afBandwidth;
m_fmExcursion = m_fmExcursion < 2500 ? 2500 : m_fmExcursion;
//m_fmExcursion = settings.m_rfBandwidth / (Real) m_channelSampleRate;
m_phaseDiscri.setFMScaling((float) m_channelSampleRate / ((float) 2*m_fmExcursion));
qDebug("WFMDemodSink::applySettings: m_fmExcursion: %f", m_fmExcursion);
}
if ((settings.m_squelch != m_settings.m_squelch) || force)
{
qDebug() << "WFMDemodSink::applySettings: set m_squelchLevel";
m_squelchLevel = pow(10.0, settings.m_squelch / 10.0);
}
m_settings = settings;
}