sdrangel/plugins/channelrx/demodnfm/nfmdemod.cpp

///////////////////////////////////////////////////////////////////////////////////
// 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                  //
// (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 <QNetworkAccessManager>
#include <QNetworkReply>
#include <QBuffer>

#include "SWGChannelSettings.h"
#include "SWGNFMDemodSettings.h"
#include "SWGChannelReport.h"
#include "SWGNFMDemodReport.h"

#include "dsp/downchannelizer.h"
#include "util/stepfunctions.h"
#include "util/db.h"
#include "audio/audiooutput.h"
#include "dsp/dspengine.h"
#include "dsp/threadedbasebandsamplesink.h"
#include "dsp/dspcommands.h"
#include "device/deviceapi.h"

#include "nfmdemod.h"

MESSAGE_CLASS_DEFINITION(NFMDemod::MsgConfigureNFMDemod, Message)
MESSAGE_CLASS_DEFINITION(NFMDemod::MsgConfigureChannelizer, Message)
MESSAGE_CLASS_DEFINITION(NFMDemod::MsgReportCTCSSFreq, Message)

const QString NFMDemod::m_channelIdURI = "sdrangel.channel.nfmdemod";
const QString NFMDemod::m_channelId = "NFMDemod";

static const double afSqTones[2] = {1000.0, 6000.0}; // {1200.0, 8000.0};
static const double afSqTones_lowrate[2] = {1000.0, 3500.0};
const int NFMDemod::m_udpBlockSize = 512;

NFMDemod::NFMDemod(DeviceAPI *devieAPI) :
        ChannelAPI(m_channelIdURI, ChannelAPI::StreamSingleSink),
        m_deviceAPI(devieAPI),
        m_inputSampleRate(48000),
        m_inputFrequencyOffset(0),
        m_running(false),
        m_ctcssIndex(0),
        m_sampleCount(0),
        m_squelchCount(0),
        m_squelchGate(4800),
        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_audioFifo(48000),
        m_settingsMutex(QMutex::Recursive)
{
    qDebug("NFMDemod::NFMDemod");
	setObjectName(m_channelId);

	m_audioBuffer.resize(1<<14);
	m_audioBufferFill = 0;

	m_agcLevel = 1.0;

    DSPEngine::instance()->getAudioDeviceManager()->addAudioSink(&m_audioFifo, getInputMessageQueue());
    m_audioSampleRate = DSPEngine::instance()->getAudioDeviceManager()->getOutputSampleRate();
    m_discriCompensation = (m_audioSampleRate/48000.0f);
    m_discriCompensation *= sqrt(m_discriCompensation);

	m_ctcssDetector.setCoefficients(m_audioSampleRate/16, m_audioSampleRate/8.0f); // 0.5s / 2 Hz resolution
	m_afSquelch.setCoefficients(m_audioSampleRate/2000, 600, m_audioSampleRate, 200, 0, afSqTones); // 0.5ms test period, 300ms average span, audio SR, 100ms attack, no decay

    m_lowpass.create(301, m_audioSampleRate, 250.0);

    applyChannelSettings(m_inputSampleRate, m_inputFrequencyOffset, true);
	applySettings(m_settings, true);

    m_channelizer = new DownChannelizer(this);
    m_threadedChannelizer = new ThreadedBasebandSampleSink(m_channelizer, this);
    m_deviceAPI->addChannelSink(m_threadedChannelizer);
    m_deviceAPI->addChannelSinkAPI(this);

    m_networkManager = new QNetworkAccessManager();
    connect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
}

NFMDemod::~NFMDemod()
{
    disconnect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
    delete m_networkManager;
	DSPEngine::instance()->getAudioDeviceManager()->removeAudioSink(&m_audioFifo);
	m_deviceAPI->removeChannelSinkAPI(this);
    m_deviceAPI->removeChannelSink(m_threadedChannelizer);
    delete m_threadedChannelizer;
    delete m_channelizer;
}

float arctan2(Real y, Real x)
{
	Real coeff_1 = M_PI / 4;
	Real coeff_2 = 3 * coeff_1;
	Real abs_y = fabs(y) + 1e-10;      // kludge to prevent 0/0 condition
	Real angle;
	if( x>= 0) {
		Real r = (x - abs_y) / (x + abs_y);
		angle = coeff_1 - coeff_1 * r;
	} else {
		Real r = (x + abs_y) / (abs_y - x);
		angle = coeff_2 - coeff_1 * r;
	}
	if(y < 0) {
		return(-angle);
	} else {
	    return(angle);
	}
}

Real angleDist(Real a, Real b)
{
	Real dist = b - a;

	while(dist <= M_PI)
		dist += 2 * M_PI;
	while(dist >= M_PI)
		dist -= 2 * M_PI;

	return dist;
}

void NFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst)
{
    (void) firstOfBurst;
	Complex ci;

	if (!m_running) {
	    return;
	}

	m_settingsMutex.lock();

	for (SampleVector::const_iterator it = begin; it != end; ++it)
	{
		Complex c(it->real(), it->imag());
		c *= m_nco.nextIQ();

        if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
        {

            qint16 sample;

            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;

            if (magsq > m_magsqPeak)
            {
                m_magsqPeak = magsq;
            }

            m_magsqCount++;
            m_sampleCount++;

            // AF processing

            if (m_settings.m_deltaSquelch)
            {
                if (m_afSquelch.analyze(demod * m_discriCompensation))
                {
                    m_afSquelchOpen = m_afSquelch.evaluate(); // ? m_squelchGate + m_squelchDecay : 0;

                    if (!m_afSquelchOpen) {
                        m_squelchDelayLine.zeroBack(m_audioSampleRate/10); // zero out evaluation period
                    }
                }

                if (m_afSquelchOpen)
                {
                    m_squelchDelayLine.write(demod * m_discriCompensation);

                    if (m_squelchCount < 2*m_squelchGate) {
                        m_squelchCount++;
                    }
                }
                else
                {
                    m_squelchDelayLine.write(0);

                    if (m_squelchCount > 0) {
                        m_squelchCount--;
                    }
                }
            }
            else
            {
                if ((Real) m_movingAverage < m_squelchLevel)
                {
                    m_squelchDelayLine.write(0);

                    if (m_squelchCount > 0) {
                        m_squelchCount--;
                    }
                }
                else
                {
                    m_squelchDelayLine.write(demod * m_discriCompensation);

                    if (m_squelchCount < 2*m_squelchGate) {
                        m_squelchCount++;
                    }
                }
            }

            m_squelchOpen = (m_squelchCount > m_squelchGate);

            if (m_settings.m_audioMute)
            {
                sample = 0;
            }
            else
            {
                if (m_squelchOpen)
                {
                    if (m_settings.m_ctcssOn)
                    {
                        Real ctcss_sample = m_lowpass.filter(demod * m_discriCompensation);

                        if ((m_sampleCount & 7) == 7) // decimate 48k -> 6k
                        {
                            if (m_ctcssDetector.analyze(&ctcss_sample))
                            {
                                int maxToneIndex;

                                if (m_ctcssDetector.getDetectedTone(maxToneIndex))
                                {
                                    if (maxToneIndex+1 != m_ctcssIndex)
                                    {
                                        if (getMessageQueueToGUI()) {
                                            MsgReportCTCSSFreq *msg = MsgReportCTCSSFreq::create(m_ctcssDetector.getToneSet()[maxToneIndex]);
                                            getMessageQueueToGUI()->push(msg);
                                        }
                                        m_ctcssIndex = maxToneIndex+1;
                                    }
                                }
                                else
                                {
                                    if (m_ctcssIndex != 0)
                                    {
                                        if (getMessageQueueToGUI()) {
                                            MsgReportCTCSSFreq *msg = MsgReportCTCSSFreq::create(0);
                                            getMessageQueueToGUI()->push(msg);
                                        }
                                        m_ctcssIndex = 0;
                                    }
                                }
                            }
                        }
                    }

                    if (m_settings.m_ctcssOn && m_ctcssIndexSelected && (m_ctcssIndexSelected != m_ctcssIndex))
                    {
                        sample = 0;
                    }
                    else
                    {
                        sample = m_bandpass.filter(m_squelchDelayLine.readBack(m_squelchGate)) * m_settings.m_volume;
                    }
                }
                else
                {
                    if (m_ctcssIndex != 0)
                    {
                        if (getMessageQueueToGUI()) {
                            MsgReportCTCSSFreq *msg = MsgReportCTCSSFreq::create(0);
                            getMessageQueueToGUI()->push(msg);
                        }

                        m_ctcssIndex = 0;
                    }

                    sample = 0;
                }
            }


            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);

                if (res != m_audioBufferFill)
                {
                    qDebug("NFMDemod::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);

		if (res != m_audioBufferFill)
		{
			qDebug("NFMDemod::feed: %u/%u tail samples written", res, m_audioBufferFill);
		}

		m_audioBufferFill = 0;
	}

	m_settingsMutex.unlock();
}

void NFMDemod::start()
{
    qDebug() << "NFMDemod::start";
    m_squelchCount = 0;
	m_audioFifo.clear();
	m_phaseDiscri.reset();
	applyChannelSettings(m_inputSampleRate, m_inputFrequencyOffset, true);
	m_running = true;
}

void NFMDemod::stop()
{
    qDebug() << "NFMDemod::stop";
    m_running = false;
}

bool NFMDemod::handleMessage(const Message& cmd)
{
	if (DownChannelizer::MsgChannelizerNotification::match(cmd))
	{
		DownChannelizer::MsgChannelizerNotification& notif = (DownChannelizer::MsgChannelizerNotification&) cmd;
		qDebug() << "NFMDemod::handleMessage: DownChannelizer::MsgChannelizerNotification";

		applyChannelSettings(notif.getSampleRate(), notif.getFrequencyOffset());

		return true;
	}
    else if (MsgConfigureChannelizer::match(cmd))
    {
        MsgConfigureChannelizer& cfg = (MsgConfigureChannelizer&) cmd;

        qDebug() << "NFMDemod::handleMessage: MsgConfigureChannelizer:"
                 << " sampleRate: " << cfg.getSampleRate()
                 << " centerFrequency: " << cfg.getCenterFrequency();

        m_channelizer->configure(m_channelizer->getInputMessageQueue(),
            cfg.getSampleRate(),
            cfg.getCenterFrequency());

        return true;
    }
	else if (MsgConfigureNFMDemod::match(cmd))
	{
	    MsgConfigureNFMDemod& cfg = (MsgConfigureNFMDemod&) cmd;
		qDebug() << "NFMDemod::handleMessage: MsgConfigureNFMDemod";

        applySettings(cfg.getSettings(), cfg.getForce());

        return true;
	}
	else if (BasebandSampleSink::MsgThreadedSink::match(cmd))
	{
	    BasebandSampleSink::MsgThreadedSink& cfg = (BasebandSampleSink::MsgThreadedSink&) cmd;
	    const QThread *thread = cfg.getThread();
	    qDebug("NFMDemod::handleMessage: BasebandSampleSink::MsgThreadedSink: %p", thread);
	    return true;
	}
    else if (DSPConfigureAudio::match(cmd))
    {
        DSPConfigureAudio& cfg = (DSPConfigureAudio&) cmd;
        uint32_t sampleRate = cfg.getSampleRate();

        qDebug() << "NFMDemod::handleMessage: DSPConfigureAudio:"
                << " sampleRate: " << sampleRate;

        if (sampleRate != m_audioSampleRate) {
            applyAudioSampleRate(sampleRate);
        }

        return true;
    }
	else if (DSPSignalNotification::match(cmd))
	{
	    return true;
	}
	else
	{
		return false;
	}
}

void NFMDemod::applyAudioSampleRate(int sampleRate)
{
    qDebug("NFMDemod::applyAudioSampleRate: %d", sampleRate);

    MsgConfigureChannelizer* channelConfigMsg = MsgConfigureChannelizer::create(
            sampleRate, m_settings.m_inputFrequencyOffset);
    m_inputMessageQueue.push(channelConfigMsg);

    m_settingsMutex.lock();

    m_interpolator.create(16, m_inputSampleRate, m_settings.m_rfBandwidth / 2.2f);
    m_interpolatorDistanceRemain = 0;
    m_interpolatorDistance = (Real) m_inputSampleRate / (Real) sampleRate;
    m_lowpass.create(301, sampleRate, 250.0);
    m_bandpass.create(301, sampleRate, 300.0, 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, sampleRate/8.0f); // 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_discriCompensation = (sampleRate/48000.0f);
    m_discriCompensation *= sqrt(m_discriCompensation);

    m_phaseDiscri.setFMScaling(sampleRate / static_cast<float>(m_settings.m_fmDeviation));
    m_audioFifo.setSize(sampleRate);
    m_squelchDelayLine.resize(sampleRate/2);

    m_settingsMutex.unlock();

    m_audioSampleRate = sampleRate;
}

void NFMDemod::applyChannelSettings(int inputSampleRate, int inputFrequencyOffset, bool force)
{
    qDebug() << "NFMDemod::applyChannelSettings:"
            << " inputSampleRate: " << inputSampleRate
            << " inputFrequencyOffset: " << inputFrequencyOffset;

    if ((inputFrequencyOffset != m_inputFrequencyOffset) ||
        (inputSampleRate != m_inputSampleRate) || force)
    {
        m_nco.setFreq(-inputFrequencyOffset, inputSampleRate);
    }

    if ((inputSampleRate != m_inputSampleRate) || force)
    {
        m_settingsMutex.lock();
        m_interpolator.create(16, inputSampleRate, m_settings.m_rfBandwidth / 2.2f);
        m_interpolatorDistanceRemain = 0;
        m_interpolatorDistance =  (Real) inputSampleRate / (Real) m_audioSampleRate;
        m_settingsMutex.unlock();
    }

    m_inputSampleRate = inputSampleRate;
    m_inputFrequencyOffset = inputFrequencyOffset;
}

void NFMDemod::applySettings(const NFMDemodSettings& settings, bool force)
{
    qDebug() << "NFMDemod::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_audioMute: " << settings.m_audioMute
            << " m_audioDeviceName: " << settings.m_audioDeviceName
            << " 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;

    QList<QString> reverseAPIKeys;

    if ((settings.m_inputFrequencyOffset != m_settings.m_inputFrequencyOffset) || force) {
        reverseAPIKeys.append("inputFrequencyOffset");
    }
    if ((settings.m_volume != m_settings.m_volume) || force) {
        reverseAPIKeys.append("volume");
    }
    if ((settings.m_ctcssOn != m_settings.m_ctcssOn) || force) {
        reverseAPIKeys.append("ctcssOn");
    }
    if ((settings.m_audioMute != m_settings.m_audioMute) || force) {
        reverseAPIKeys.append("audioMute");
    }
    if ((settings.m_rgbColor != m_settings.m_rgbColor) || force) {
        reverseAPIKeys.append("rgbColor");
    }
    if ((settings.m_title != m_settings.m_title) || force) {
        reverseAPIKeys.append("title");
    }

    if ((settings.m_rfBandwidth != m_settings.m_rfBandwidth) || force)
    {
        reverseAPIKeys.append("rfBandwidth");
        m_settingsMutex.lock();
        m_interpolator.create(16, m_inputSampleRate, settings.m_rfBandwidth / 2.2);
        m_interpolatorDistanceRemain = 0;
        m_interpolatorDistance =  (Real) m_inputSampleRate / (Real) m_audioSampleRate;
        m_settingsMutex.unlock();
    }

    if ((settings.m_fmDeviation != m_settings.m_fmDeviation) || force)
    {
        reverseAPIKeys.append("fmDeviation");
        m_phaseDiscri.setFMScaling((8.0f*m_audioSampleRate) / static_cast<float>(settings.m_fmDeviation)); // integrate 4x factor
    }

    if ((settings.m_afBandwidth != m_settings.m_afBandwidth) || force)
    {
        reverseAPIKeys.append("afBandwidth");
        m_settingsMutex.lock();
        m_bandpass.create(301, m_audioSampleRate, 300.0, settings.m_afBandwidth);
        m_settingsMutex.unlock();
    }

    if ((settings.m_squelchGate != m_settings.m_squelchGate) || force)
    {
        reverseAPIKeys.append("squelchGate");
        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) || force) {
        reverseAPIKeys.append("squelch");
    }
    if ((settings.m_deltaSquelch != m_settings.m_deltaSquelch) || force) {
        reverseAPIKeys.append("deltaSquelch");
    }

    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)
    {
        reverseAPIKeys.append("ctcssIndex");
        setSelectedCtcssIndex(settings.m_ctcssIndex);
    }

    if ((settings.m_audioDeviceName != m_settings.m_audioDeviceName) || force)
    {
        reverseAPIKeys.append("audioDeviceName");
        AudioDeviceManager *audioDeviceManager = DSPEngine::instance()->getAudioDeviceManager();
        int audioDeviceIndex = audioDeviceManager->getOutputDeviceIndex(settings.m_audioDeviceName);
        //qDebug("AMDemod::applySettings: audioDeviceName: %s audioDeviceIndex: %d", qPrintable(settings.m_audioDeviceName), audioDeviceIndex);
        audioDeviceManager->addAudioSink(&m_audioFifo, getInputMessageQueue(), audioDeviceIndex);
        uint32_t audioSampleRate = audioDeviceManager->getOutputSampleRate(audioDeviceIndex);

        if (m_audioSampleRate != audioSampleRate) {
            applyAudioSampleRate(audioSampleRate);
        }
    }

    if (settings.m_useReverseAPI)
    {
        bool fullUpdate = ((m_settings.m_useReverseAPI != settings.m_useReverseAPI) && settings.m_useReverseAPI) ||
                (m_settings.m_reverseAPIAddress != settings.m_reverseAPIAddress) ||
                (m_settings.m_reverseAPIPort != settings.m_reverseAPIPort) ||
                (m_settings.m_reverseAPIDeviceIndex != settings.m_reverseAPIDeviceIndex) ||
                (m_settings.m_reverseAPIChannelIndex != settings.m_reverseAPIChannelIndex);
        webapiReverseSendSettings(reverseAPIKeys, settings, fullUpdate || force);
    }

    m_settings = settings;
}

QByteArray NFMDemod::serialize() const
{
    return m_settings.serialize();
}

bool NFMDemod::deserialize(const QByteArray& data)
{
    bool success = true;

    if (!m_settings.deserialize(data))
    {
        m_settings.resetToDefaults();
        success = false;
    }

    NFMDemod::MsgConfigureChannelizer* channelConfigMsg = NFMDemod::MsgConfigureChannelizer::create(
            m_audioSampleRate, m_settings.m_inputFrequencyOffset);
    m_inputMessageQueue.push(channelConfigMsg);

    MsgConfigureNFMDemod *msg = MsgConfigureNFMDemod::create(m_settings, true);
    m_inputMessageQueue.push(msg);

    return success;
}

int NFMDemod::webapiSettingsGet(
            SWGSDRangel::SWGChannelSettings& response,
            QString& errorMessage)
{
    (void) errorMessage;
    response.setNfmDemodSettings(new SWGSDRangel::SWGNFMDemodSettings());
    response.getNfmDemodSettings()->init();
    webapiFormatChannelSettings(response, m_settings);
    return 200;
}

int NFMDemod::webapiSettingsPutPatch(
            bool force,
            const QStringList& channelSettingsKeys,
            SWGSDRangel::SWGChannelSettings& response,
            QString& errorMessage)
{
    (void) errorMessage;
    NFMDemodSettings settings = m_settings;
    bool frequencyOffsetChanged = false;

    if (channelSettingsKeys.contains("afBandwidth")) {
        settings.m_afBandwidth = response.getNfmDemodSettings()->getAfBandwidth();
    }
    if (channelSettingsKeys.contains("audioMute")) {
        settings.m_audioMute = response.getNfmDemodSettings()->getAudioMute() != 0;
    }
    if (channelSettingsKeys.contains("ctcssIndex")) {
        settings.m_ctcssIndex = response.getNfmDemodSettings()->getCtcssIndex();
    }
    if (channelSettingsKeys.contains("ctcssOn")) {
        settings.m_ctcssOn = response.getNfmDemodSettings()->getCtcssOn() != 0;
    }
    if (channelSettingsKeys.contains("deltaSquelch")) {
        settings.m_deltaSquelch = response.getNfmDemodSettings()->getDeltaSquelch() != 0;
    }
    if (channelSettingsKeys.contains("fmDeviation")) {
        settings.m_fmDeviation = response.getNfmDemodSettings()->getFmDeviation();
    }
    if (channelSettingsKeys.contains("inputFrequencyOffset"))
    {
        settings.m_inputFrequencyOffset = response.getNfmDemodSettings()->getInputFrequencyOffset();
        frequencyOffsetChanged = true;
    }
    if (channelSettingsKeys.contains("rfBandwidth")) {
        settings.m_rfBandwidth = response.getNfmDemodSettings()->getRfBandwidth();
    }
    if (channelSettingsKeys.contains("rgbColor")) {
        settings.m_rgbColor = response.getNfmDemodSettings()->getRgbColor();
    }
    if (channelSettingsKeys.contains("squelch")) {
        settings.m_squelch = response.getNfmDemodSettings()->getSquelch();
    }
    if (channelSettingsKeys.contains("squelchGate")) {
        settings.m_squelchGate = response.getNfmDemodSettings()->getSquelchGate();
    }
    if (channelSettingsKeys.contains("title")) {
        settings.m_title = *response.getNfmDemodSettings()->getTitle();
    }
    if (channelSettingsKeys.contains("volume")) {
        settings.m_volume = response.getNfmDemodSettings()->getVolume();
    }
    if (channelSettingsKeys.contains("audioDeviceName")) {
        settings.m_audioDeviceName = *response.getNfmDemodSettings()->getAudioDeviceName();
    }
    if (channelSettingsKeys.contains("useReverseAPI")) {
        settings.m_useReverseAPI = response.getNfmDemodSettings()->getUseReverseApi() != 0;
    }
    if (channelSettingsKeys.contains("reverseAPIAddress")) {
        settings.m_reverseAPIAddress = *response.getNfmDemodSettings()->getReverseApiAddress();
    }
    if (channelSettingsKeys.contains("reverseAPIPort")) {
        settings.m_reverseAPIPort = response.getNfmDemodSettings()->getReverseApiPort();
    }
    if (channelSettingsKeys.contains("reverseAPIDeviceIndex")) {
        settings.m_reverseAPIDeviceIndex = response.getNfmDemodSettings()->getReverseApiDeviceIndex();
    }
    if (channelSettingsKeys.contains("reverseAPIChannelIndex")) {
        settings.m_reverseAPIChannelIndex = response.getNfmDemodSettings()->getReverseApiChannelIndex();
    }

    if (frequencyOffsetChanged)
    {
        MsgConfigureChannelizer* channelConfigMsg = MsgConfigureChannelizer::create(
                m_audioSampleRate, settings.m_inputFrequencyOffset);
        m_inputMessageQueue.push(channelConfigMsg);
    }

    MsgConfigureNFMDemod *msg = MsgConfigureNFMDemod::create(settings, force);
    m_inputMessageQueue.push(msg);

    if (m_guiMessageQueue) // forward to GUI if any
    {
        MsgConfigureNFMDemod *msgToGUI = MsgConfigureNFMDemod::create(settings, force);
        m_guiMessageQueue->push(msgToGUI);
    }

    webapiFormatChannelSettings(response, settings);

    return 200;
}

int NFMDemod::webapiReportGet(
            SWGSDRangel::SWGChannelReport& response,
            QString& errorMessage)
{
    (void) errorMessage;
    response.setNfmDemodReport(new SWGSDRangel::SWGNFMDemodReport());
    response.getNfmDemodReport()->init();
    webapiFormatChannelReport(response);
    return 200;
}

void NFMDemod::webapiFormatChannelSettings(SWGSDRangel::SWGChannelSettings& response, const NFMDemodSettings& settings)
{
    response.getNfmDemodSettings()->setAfBandwidth(settings.m_afBandwidth);
    response.getNfmDemodSettings()->setAudioMute(settings.m_audioMute ? 1 : 0);
    response.getNfmDemodSettings()->setCtcssIndex(settings.m_ctcssIndex);
    response.getNfmDemodSettings()->setCtcssOn(settings.m_ctcssOn ? 1 : 0);
    response.getNfmDemodSettings()->setDeltaSquelch(settings.m_deltaSquelch ? 1 : 0);
    response.getNfmDemodSettings()->setFmDeviation(settings.m_fmDeviation);
    response.getNfmDemodSettings()->setInputFrequencyOffset(settings.m_inputFrequencyOffset);
    response.getNfmDemodSettings()->setRfBandwidth(settings.m_rfBandwidth);
    response.getNfmDemodSettings()->setRgbColor(settings.m_rgbColor);
    response.getNfmDemodSettings()->setSquelch(settings.m_squelch);
    response.getNfmDemodSettings()->setSquelchGate(settings.m_squelchGate);
    response.getNfmDemodSettings()->setVolume(settings.m_volume);

    if (response.getNfmDemodSettings()->getTitle()) {
        *response.getNfmDemodSettings()->getTitle() = settings.m_title;
    } else {
        response.getNfmDemodSettings()->setTitle(new QString(settings.m_title));
    }

    if (response.getNfmDemodSettings()->getAudioDeviceName()) {
        *response.getNfmDemodSettings()->getAudioDeviceName() = settings.m_audioDeviceName;
    } else {
        response.getNfmDemodSettings()->setAudioDeviceName(new QString(settings.m_audioDeviceName));
    }

    response.getNfmDemodSettings()->setUseReverseApi(settings.m_useReverseAPI ? 1 : 0);

    if (response.getNfmDemodSettings()->getReverseApiAddress()) {
        *response.getNfmDemodSettings()->getReverseApiAddress() = settings.m_reverseAPIAddress;
    } else {
        response.getNfmDemodSettings()->setReverseApiAddress(new QString(settings.m_reverseAPIAddress));
    }

    response.getNfmDemodSettings()->setReverseApiPort(settings.m_reverseAPIPort);
    response.getNfmDemodSettings()->setReverseApiDeviceIndex(settings.m_reverseAPIDeviceIndex);
    response.getNfmDemodSettings()->setReverseApiChannelIndex(settings.m_reverseAPIChannelIndex);
}

void NFMDemod::webapiFormatChannelReport(SWGSDRangel::SWGChannelReport& response)
{
    double magsqAvg, magsqPeak;
    int nbMagsqSamples;
    getMagSqLevels(magsqAvg, magsqPeak, nbMagsqSamples);

    response.getNfmDemodReport()->setChannelPowerDb(CalcDb::dbPower(magsqAvg));
    response.getNfmDemodReport()->setCtcssTone(m_settings.m_ctcssOn ? (m_ctcssIndex ? 0 : m_ctcssDetector.getToneSet()[m_ctcssIndex-1]) : 0);
    response.getNfmDemodReport()->setSquelch(m_squelchOpen ? 1 : 0);
    response.getNfmDemodReport()->setAudioSampleRate(m_audioSampleRate);
    response.getNfmDemodReport()->setChannelSampleRate(m_inputSampleRate);
}

void NFMDemod::webapiReverseSendSettings(QList<QString>& channelSettingsKeys, const NFMDemodSettings& settings, bool force)
{
    SWGSDRangel::SWGChannelSettings *swgChannelSettings = new SWGSDRangel::SWGChannelSettings();
    swgChannelSettings->setDirection(0); // single sink (Rx)
    swgChannelSettings->setOriginatorChannelIndex(getIndexInDeviceSet());
    swgChannelSettings->setOriginatorDeviceSetIndex(getDeviceSetIndex());
    swgChannelSettings->setChannelType(new QString("NFMDemod"));
    swgChannelSettings->setNfmDemodSettings(new SWGSDRangel::SWGNFMDemodSettings());
    SWGSDRangel::SWGNFMDemodSettings *swgNFMDemodSettings = swgChannelSettings->getNfmDemodSettings();

    // transfer data that has been modified. When force is on transfer all data except reverse API data

    if (channelSettingsKeys.contains("afBandwidth") || force) {
        swgNFMDemodSettings->setAfBandwidth(settings.m_afBandwidth);
    }
    if (channelSettingsKeys.contains("audioMute") || force) {
        swgNFMDemodSettings->setAudioMute(settings.m_audioMute ? 1 : 0);
    }
    if (channelSettingsKeys.contains("ctcssIndex") || force) {
        swgNFMDemodSettings->setCtcssIndex(settings.m_ctcssIndex);
    }
    if (channelSettingsKeys.contains("ctcssOn") || force) {
        swgNFMDemodSettings->setCtcssOn(settings.m_ctcssOn ? 1 : 0);
    }
    if (channelSettingsKeys.contains("deltaSquelch") || force) {
        swgNFMDemodSettings->setDeltaSquelch(settings.m_deltaSquelch ? 1 : 0);
    }
    if (channelSettingsKeys.contains("fmDeviation") || force) {
        swgNFMDemodSettings->setFmDeviation(settings.m_fmDeviation);
    }
    if (channelSettingsKeys.contains("inputFrequencyOffset") || force) {
        swgNFMDemodSettings->setInputFrequencyOffset(settings.m_inputFrequencyOffset);
    }
    if (channelSettingsKeys.contains("rfBandwidth") || force) {
        swgNFMDemodSettings->setRfBandwidth(settings.m_rfBandwidth);
    }
    if (channelSettingsKeys.contains("rgbColor") || force) {
        swgNFMDemodSettings->setRgbColor(settings.m_rgbColor);
    }
    if (channelSettingsKeys.contains("squelch") || force) {
        swgNFMDemodSettings->setSquelch(settings.m_squelch);
    }
    if (channelSettingsKeys.contains("squelchGate") || force) {
        swgNFMDemodSettings->setSquelchGate(settings.m_squelchGate);
    }
    if (channelSettingsKeys.contains("title") || force) {
        swgNFMDemodSettings->setTitle(new QString(settings.m_title));
    }
    if (channelSettingsKeys.contains("volume") || force) {
        swgNFMDemodSettings->setVolume(settings.m_volume);
    }
    if (channelSettingsKeys.contains("audioDeviceName") || force) {
        swgNFMDemodSettings->setAudioDeviceName(new QString(settings.m_audioDeviceName));
    }

    QString channelSettingsURL = QString("http://%1:%2/sdrangel/deviceset/%3/channel/%4/settings")
            .arg(settings.m_reverseAPIAddress)
            .arg(settings.m_reverseAPIPort)
            .arg(settings.m_reverseAPIDeviceIndex)
            .arg(settings.m_reverseAPIChannelIndex);
    m_networkRequest.setUrl(QUrl(channelSettingsURL));
    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");

    QBuffer *buffer=new QBuffer();
    buffer->open((QBuffer::ReadWrite));
    buffer->write(swgChannelSettings->asJson().toUtf8());
    buffer->seek(0);

    // Always use PATCH to avoid passing reverse API settings
    m_networkManager->sendCustomRequest(m_networkRequest, "PATCH", buffer);

    delete swgChannelSettings;
}

void NFMDemod::networkManagerFinished(QNetworkReply *reply)
{
    QNetworkReply::NetworkError replyError = reply->error();

    if (replyError)
    {
        qWarning() << "NFMDemod::networkManagerFinished:"
                << " error(" << (int) replyError
                << "): " << replyError
                << ": " << reply->errorString();
        return;
    }

    QString answer = reply->readAll();
    answer.chop(1); // remove last \n
    qDebug("NFMDemod::networkManagerFinished: reply:\n%s", answer.toStdString().c_str());
}