mirror of https://github.com/f4exb/sdrangel.git
423 lines
15 KiB
C++
423 lines
15 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2019-2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
|
|
// Copyright (C) 2020 Kacper Michajłow <kasper93@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 <cstdio>
|
|
#include <complex.h>
|
|
|
|
#include <QTime>
|
|
#include <QDebug>
|
|
|
|
#include "util/messagequeue.h"
|
|
#include "dsp/misc.h"
|
|
#include "dsp/datafifo.h"
|
|
#include "maincore.h"
|
|
|
|
#include "nfmdemodreport.h"
|
|
#include "nfmdemodsink.h"
|
|
|
|
const double NFMDemodSink::afSqTones[] = {1000.0, 6000.0}; // {1200.0, 8000.0};
|
|
const double NFMDemodSink::afSqTones_lowrate[] = {1000.0, 3500.0};
|
|
const unsigned NFMDemodSink::FFT_FILTER_LENGTH = 1024;
|
|
const unsigned NFMDemodSink::CTCSS_DETECTOR_RATE = 6000;
|
|
|
|
NFMDemodSink::NFMDemodSink() :
|
|
m_channelSampleRate(48000),
|
|
m_channelFrequencyOffset(0),
|
|
m_audioSampleRate(48000),
|
|
m_audioBufferFill(0),
|
|
m_audioFifo(48000),
|
|
m_rfFilter(FFT_FILTER_LENGTH),
|
|
m_ctcssIndex(0),
|
|
m_dcsCode(0),
|
|
m_sampleCount(0),
|
|
m_squelchCount(0),
|
|
m_squelchGate(4800),
|
|
m_filterTaps((48000 / 48) | 1),
|
|
m_squelchLevel(-990),
|
|
m_squelchOpen(false),
|
|
m_afSquelchOpen(false),
|
|
m_magsq(0.0f),
|
|
m_magsqSum(0.0f),
|
|
m_magsqPeak(0.0f),
|
|
m_magsqCount(0),
|
|
m_afSquelch(),
|
|
m_squelchDelayLine(24000),
|
|
m_messageQueueToGUI(nullptr)
|
|
{
|
|
m_audioBuffer.resize(1<<14);
|
|
m_demodBuffer.resize(1<<12);
|
|
m_demodBufferFill = 0;
|
|
|
|
m_dcsDetector.setSampleRate(CTCSS_DETECTOR_RATE);
|
|
m_dcsDetector.setEqWindow(23);
|
|
|
|
applySettings(m_settings, true);
|
|
applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
|
|
}
|
|
|
|
void NFMDemodSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
|
|
{
|
|
if (m_channelSampleRate == 0) {
|
|
return;
|
|
}
|
|
|
|
for (SampleVector::const_iterator it = begin; it != end; ++it)
|
|
{
|
|
Complex c(it->real(), it->imag());
|
|
c *= m_nco.nextIQ();
|
|
|
|
Complex ci;
|
|
fftfilt::cmplx *rf;
|
|
int rf_out = m_rfFilter.runFilt(c, &rf); // filter RF before demod
|
|
for (int i = 0 ; i < rf_out; i++)
|
|
{
|
|
if (m_interpolatorDistance == 1.0f)
|
|
{
|
|
processOneSample(rf[i]);
|
|
}
|
|
else if (m_interpolatorDistance < 1.0f) // interpolate
|
|
{
|
|
while (!m_interpolator.interpolate(&m_interpolatorDistanceRemain, rf[i], &ci))
|
|
{
|
|
processOneSample(ci);
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
else // decimate
|
|
{
|
|
if (m_interpolator.decimate(&m_interpolatorDistanceRemain, rf[i], &ci))
|
|
{
|
|
processOneSample(ci);
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void NFMDemodSink::processOneSample(Complex &ci)
|
|
{
|
|
qint16 sample = 0;
|
|
|
|
double magsqRaw; // = ci.real()*ci.real() + c.imag()*c.imag();
|
|
Real deviation;
|
|
|
|
Real demod = m_phaseDiscri.phaseDiscriminatorDelta(ci, magsqRaw, deviation);
|
|
|
|
Real magsq = magsqRaw / (SDR_RX_SCALED*SDR_RX_SCALED);
|
|
m_movingAverage(magsq);
|
|
m_magsqSum += magsq;
|
|
m_magsqPeak = std::max<double>(magsq, m_magsqPeak);
|
|
m_magsqCount++;
|
|
m_sampleCount++;
|
|
|
|
bool squelchOpen = m_afSquelchOpen && m_settings.m_deltaSquelch;
|
|
if (m_settings.m_deltaSquelch)
|
|
{
|
|
if (m_afSquelch.analyze(demod))
|
|
{
|
|
m_afSquelchOpen = squelchOpen = m_afSquelch.evaluate();
|
|
|
|
if (!squelchOpen) {
|
|
m_squelchDelayLine.zeroBack(m_audioSampleRate/10); // zero out evaluation period
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
squelchOpen = m_movingAverage >= m_squelchLevel;
|
|
}
|
|
|
|
if (squelchOpen)
|
|
{
|
|
m_squelchDelayLine.write(demod);
|
|
|
|
if (m_squelchCount < 2*m_squelchGate) {
|
|
m_squelchCount++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_squelchDelayLine.write(0);
|
|
|
|
if (m_squelchCount > 0) {
|
|
m_squelchCount--;
|
|
}
|
|
}
|
|
|
|
m_squelchOpen = m_squelchCount > m_squelchGate;
|
|
int ctcssIndex = m_squelchOpen && m_settings.m_ctcssOn ? m_ctcssIndex : 0;
|
|
unsigned int dcsCode = m_squelchOpen && m_settings.m_dcsOn ? m_dcsCode : 0;
|
|
|
|
if (m_squelchOpen)
|
|
{
|
|
if (m_settings.m_ctcssOn)
|
|
{
|
|
int factor = (m_audioSampleRate / CTCSS_DETECTOR_RATE) - 1; // decimate -> 6k
|
|
|
|
if ((m_sampleCount & factor) == factor)
|
|
{
|
|
Real ctcssSample = m_ctcssLowpass.filter(demod);
|
|
|
|
if (m_ctcssDetector.analyze(&ctcssSample))
|
|
{
|
|
int maxToneIndex;
|
|
ctcssIndex = m_ctcssDetector.getDetectedTone(maxToneIndex) ? maxToneIndex + 1 : 0;
|
|
}
|
|
}
|
|
}
|
|
else if (m_settings.m_dcsOn)
|
|
{
|
|
int factor = (m_audioSampleRate / CTCSS_DETECTOR_RATE) - 1; // decimate -> 6k (same decimation as for CTCSS)
|
|
|
|
if ((m_sampleCount & factor) == factor)
|
|
{
|
|
Real dcsSample = m_ctcssLowpass.filter(demod);
|
|
unsigned int dcsCodeDetected;
|
|
|
|
if (m_dcsDetector.analyze(&dcsSample, dcsCodeDetected)) {
|
|
dcsCode = DCSCodes::m_toCanonicalCode.value(dcsCodeDetected, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!m_settings.m_audioMute &&
|
|
(!m_settings.m_ctcssOn || m_ctcssIndexSelected == ctcssIndex || m_ctcssIndexSelected == 0) &&
|
|
(!m_settings.m_dcsOn || m_dcsCodeSeleted == dcsCode || m_dcsCodeSeleted == 0))
|
|
{
|
|
Real audioSample = m_squelchDelayLine.readBack(m_squelchGate);
|
|
audioSample = m_settings.m_highPass ? m_bandpass.filter(audioSample) : m_lowpass.filter(audioSample);
|
|
|
|
audioSample *= m_settings.m_volume * std::numeric_limits<int16_t>::max();
|
|
sample = clamp<float>(std::rint(audioSample), std::numeric_limits<int16_t>::lowest(), std::numeric_limits<int16_t>::max());
|
|
}
|
|
}
|
|
|
|
if (ctcssIndex != m_ctcssIndex)
|
|
{
|
|
auto *guiQueue = getMessageQueueToGUI();
|
|
|
|
if (guiQueue)
|
|
{
|
|
guiQueue->push(NFMDemodReport::MsgReportCTCSSFreq::create(
|
|
ctcssIndex ? m_ctcssDetector.getToneSet()[ctcssIndex - 1] : 0));
|
|
}
|
|
|
|
m_ctcssIndex = ctcssIndex;
|
|
}
|
|
|
|
if (dcsCode != m_dcsCode)
|
|
{
|
|
auto *guiQueue = getMessageQueueToGUI();
|
|
|
|
if (guiQueue) {
|
|
guiQueue->push(NFMDemodReport::MsgReportDCSCode::create(dcsCode));
|
|
}
|
|
|
|
m_dcsCode = dcsCode;
|
|
}
|
|
|
|
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("NFMDemodSink::processOneSample: %lu/%lu audio samples written m_audioSampleRate: %u m_channelSampleRate: %d",
|
|
res, m_audioBufferFill, m_audioSampleRate, m_channelSampleRate);
|
|
}
|
|
|
|
m_audioBufferFill = 0;
|
|
}
|
|
|
|
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 NFMDemodSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
|
|
{
|
|
qDebug() << "NFMDemodSink::applyChannelSettings:"
|
|
<< " channelSampleRate: " << channelSampleRate
|
|
<< " channelFrequencyOffset: " << channelFrequencyOffset;
|
|
|
|
if ((channelFrequencyOffset != m_channelFrequencyOffset) ||
|
|
(channelSampleRate != m_channelSampleRate) || force)
|
|
{
|
|
m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
|
|
}
|
|
|
|
if ((channelSampleRate != m_channelSampleRate) || force)
|
|
{
|
|
m_interpolator.create(16, channelSampleRate, m_settings.m_rfBandwidth / 2.2);
|
|
m_interpolatorDistance = Real(channelSampleRate) / Real(m_audioSampleRate);
|
|
m_interpolatorDistanceRemain = m_interpolatorDistance;
|
|
|
|
Real lowCut = -Real(m_settings.m_fmDeviation) / channelSampleRate;
|
|
Real hiCut = Real(m_settings.m_fmDeviation) / channelSampleRate;
|
|
m_rfFilter.create_filter(lowCut, hiCut);
|
|
}
|
|
|
|
m_channelSampleRate = channelSampleRate;
|
|
m_channelFrequencyOffset = channelFrequencyOffset;
|
|
}
|
|
|
|
void NFMDemodSink::applySettings(const NFMDemodSettings& settings, bool force)
|
|
{
|
|
qDebug() << "NFMDemodSink::applySettings:"
|
|
<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
|
|
<< " m_rfBandwidth: " << settings.m_rfBandwidth
|
|
<< " m_afBandwidth: " << settings.m_afBandwidth
|
|
<< " m_fmDeviation: " << settings.m_fmDeviation
|
|
<< " m_volume: " << settings.m_volume
|
|
<< " m_squelchGate: " << settings.m_squelchGate
|
|
<< " m_deltaSquelch: " << settings.m_deltaSquelch
|
|
<< " m_squelch: " << settings.m_squelch
|
|
<< " m_ctcssIndex: " << settings.m_ctcssIndex
|
|
<< " m_ctcssOn: " << settings.m_ctcssOn
|
|
<< " m_dcsOn: " << settings.m_dcsOn
|
|
<< " m_dcsCode: " << settings.m_dcsCode
|
|
<< " m_dcsPositive: " << settings.m_dcsPositive
|
|
<< " m_highPass: " << settings.m_highPass
|
|
<< " m_audioMute: " << settings.m_audioMute
|
|
<< " m_audioDeviceName: " << settings.m_audioDeviceName
|
|
<< " force: " << force;
|
|
|
|
if ((settings.m_rfBandwidth != m_settings.m_rfBandwidth) || force)
|
|
{
|
|
m_interpolator.create(16, m_channelSampleRate, settings.m_rfBandwidth / 2.2);
|
|
m_interpolatorDistance = Real(m_channelSampleRate) / Real(m_audioSampleRate);
|
|
m_interpolatorDistanceRemain = m_interpolatorDistance;
|
|
}
|
|
|
|
if ((settings.m_fmDeviation != m_settings.m_fmDeviation) || force) {
|
|
Real lowCut = -Real(settings.m_fmDeviation) / m_channelSampleRate;
|
|
Real hiCut = Real(settings.m_fmDeviation) / m_channelSampleRate;
|
|
m_rfFilter.create_filter(lowCut, hiCut);
|
|
m_phaseDiscri.setFMScaling(Real(m_audioSampleRate) / (2.0f * settings.m_fmDeviation));
|
|
}
|
|
|
|
if ((settings.m_afBandwidth != m_settings.m_afBandwidth) || force)
|
|
{
|
|
m_bandpass.create(m_filterTaps, m_audioSampleRate, 300.0, settings.m_afBandwidth);
|
|
m_lowpass.create(m_filterTaps, m_audioSampleRate, settings.m_afBandwidth);
|
|
}
|
|
|
|
if ((settings.m_squelchGate != m_settings.m_squelchGate) || force)
|
|
{
|
|
m_squelchGate = (m_audioSampleRate / 100) * settings.m_squelchGate; // gate is given in 10s of ms at 48000 Hz audio sample rate
|
|
m_squelchCount = 0; // reset squelch open counter
|
|
}
|
|
|
|
if ((settings.m_squelch != m_settings.m_squelch) ||
|
|
(settings.m_deltaSquelch != m_settings.m_deltaSquelch) || force)
|
|
{
|
|
if (settings.m_deltaSquelch)
|
|
{ // input is a value in negative centis
|
|
m_squelchLevel = (- settings.m_squelch) / 100.0;
|
|
m_afSquelch.setThreshold(m_squelchLevel);
|
|
m_afSquelch.reset();
|
|
}
|
|
else
|
|
{ // input is a value in deci-Bels
|
|
m_squelchLevel = std::pow(10.0, settings.m_squelch / 10.0);
|
|
m_movingAverage.reset();
|
|
}
|
|
|
|
m_squelchCount = 0; // reset squelch open counter
|
|
}
|
|
|
|
if ((settings.m_ctcssIndex != m_settings.m_ctcssIndex) || force) {
|
|
setSelectedCtcssIndex(settings.m_ctcssIndex);
|
|
}
|
|
|
|
if ((settings.m_dcsCode != m_settings.m_dcsCode) ||
|
|
(settings.m_dcsPositive != m_settings.m_dcsPositive) || force)
|
|
{
|
|
setSelectedDcsCode(settings.m_dcsCode, settings.m_dcsPositive);
|
|
}
|
|
|
|
m_settings = settings;
|
|
}
|
|
|
|
void NFMDemodSink::applyAudioSampleRate(unsigned int sampleRate)
|
|
{
|
|
qDebug("NFMDemodSink::applyAudioSampleRate: %u m_channelSampleRate: %d", sampleRate, m_channelSampleRate);
|
|
|
|
m_filterTaps = (sampleRate / 48) | 1;
|
|
m_ctcssLowpass.create((CTCSS_DETECTOR_RATE / 48) | 1, CTCSS_DETECTOR_RATE, 250.0);
|
|
m_bandpass.create(m_filterTaps, sampleRate, 300.0, m_settings.m_afBandwidth);
|
|
m_lowpass.create(m_filterTaps, sampleRate, m_settings.m_afBandwidth);
|
|
m_squelchGate = (sampleRate / 100) * m_settings.m_squelchGate; // gate is given in 10s of ms at 48000 Hz audio sample rate
|
|
m_squelchCount = 0; // reset squelch open counter
|
|
m_ctcssDetector.setCoefficients(sampleRate/16, CTCSS_DETECTOR_RATE); // 0.5s / 2 Hz resolution
|
|
|
|
if (sampleRate < 16000) {
|
|
m_afSquelch.setCoefficients(sampleRate/2000, 600, sampleRate, 200, 0, afSqTones_lowrate); // 0.5ms test period, 300ms average span, audio SR, 100ms attack, no decay
|
|
} else {
|
|
m_afSquelch.setCoefficients(sampleRate/2000, 600, sampleRate, 200, 0, afSqTones); // 0.5ms test period, 300ms average span, audio SR, 100ms attack, no decay
|
|
}
|
|
|
|
m_afSquelch.setThreshold(m_squelchLevel);
|
|
m_phaseDiscri.setFMScaling(Real(sampleRate) / (2.0f * m_settings.m_fmDeviation));
|
|
m_audioFifo.setSize(sampleRate);
|
|
m_squelchDelayLine.resize(sampleRate/2);
|
|
m_interpolatorDistance = Real(m_channelSampleRate) / Real(sampleRate);
|
|
m_interpolatorDistanceRemain = m_interpolatorDistance;
|
|
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);
|
|
}
|
|
}
|
|
}
|