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sdrangel/plugins/channelrx/demoddsd/dsddemod.cpp

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 F4EXB //
// written by Edouard Griffiths //
// //
// 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 "audio/audiooutput.h"
#include "dsp/pidcontroller.h"
#include "dsp/dspengine.h"
#include "dsp/threadedbasebandsamplesink.h"
#include <dsp/downchannelizer.h>
#include <device/devicesourceapi.h>
#include "dsddemod.h"
MESSAGE_CLASS_DEFINITION(DSDDemod::MsgConfigureChannelizer, Message)
MESSAGE_CLASS_DEFINITION(DSDDemod::MsgConfigureDSDDemod, Message)
MESSAGE_CLASS_DEFINITION(DSDDemod::MsgConfigureMyPosition, Message)
const int DSDDemod::m_udpBlockSize = 512;
DSDDemod::DSDDemod(DeviceSourceAPI *deviceAPI) :
m_deviceAPI(deviceAPI),
m_interpolatorDistance(0.0f),
m_interpolatorDistanceRemain(0.0f),
m_sampleCount(0),
m_squelchCount(0),
m_squelchGate(0),
m_squelchLevel(1e-4),
m_squelchOpen(false),
m_movingAverage(40, 0),
m_fmExcursion(24),
m_audioFifo1(48000),
m_audioFifo2(48000),
m_scope(0),
m_scopeEnabled(true),
m_dsdDecoder(),
m_settingsMutex(QMutex::Recursive)
{
setObjectName("DSDDemod");
m_audioBuffer.resize(1<<14);
m_audioBufferFill = 0;
m_sampleBuffer = new qint16[1<<17]; // 128 kS
m_sampleBufferIndex = 0;
m_movingAverage.resize(16, 0);
m_magsq = 0.0f;
m_magsqSum = 0.0f;
m_magsqPeak = 0.0f;
m_magsqCount = 0;
DSPEngine::instance()->addAudioSink(&m_audioFifo1);
DSPEngine::instance()->addAudioSink(&m_audioFifo2);
m_udpBufferAudio = new UDPSink<AudioSample>(this, m_udpBlockSize, m_settings.m_udpPort);
m_audioFifo1.setUDPSink(m_udpBufferAudio);
m_audioFifo2.setUDPSink(m_udpBufferAudio);
m_channelizer = new DownChannelizer(this);
m_threadedChannelizer = new ThreadedBasebandSampleSink(m_channelizer, this);
m_deviceAPI->addThreadedSink(m_threadedChannelizer);
applySettings(m_settings, true);
}
DSDDemod::~DSDDemod()
{
delete[] m_sampleBuffer;
DSPEngine::instance()->removeAudioSink(&m_audioFifo1);
DSPEngine::instance()->removeAudioSink(&m_audioFifo2);
delete m_udpBufferAudio;
m_deviceAPI->removeThreadedSink(m_threadedChannelizer);
delete m_threadedChannelizer;
delete m_channelizer;
}
void DSDDemod::configureMyPosition(MessageQueue* messageQueue, float myLatitude, float myLongitude)
{
Message* cmd = MsgConfigureMyPosition::create(myLatitude, myLongitude);
messageQueue->push(cmd);
}
void DSDDemod::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst __attribute__((unused)))
{
Complex ci;
int samplesPerSymbol = m_dsdDecoder.getSamplesPerSymbol();
m_settingsMutex.lock();
m_scopeSampleBuffer.clear();
m_dsdDecoder.enableMbelib(!DSPEngine::instance()->hasDVSerialSupport()); // disable mbelib if DV serial support is present and activated else enable it
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, delayedSample;
Real magsq = ((ci.real()*ci.real() + ci.imag()*ci.imag())) / (1<<30);
m_movingAverage.feed(magsq);
m_magsqSum += magsq;
if (magsq > m_magsqPeak)
{
m_magsqPeak = magsq;
}
m_magsqCount++;
Real demod = 32768.0f * m_phaseDiscri.phaseDiscriminator(ci) * m_settings.m_demodGain;
m_sampleCount++;
// AF processing
if (m_movingAverage.average() > m_squelchLevel)
{
if (m_squelchGate > 0)
{
if (m_squelchCount < m_squelchGate) {
m_squelchCount++;
}
m_squelchOpen = m_squelchCount == m_squelchGate;
}
else
{
m_squelchOpen = true;
}
}
else
{
m_squelchCount = 0;
m_squelchOpen = false;
}
if (m_squelchOpen)
{
sample = demod;
}
else
{
sample = 0;
}
m_dsdDecoder.pushSample(sample);
if (m_settings.m_enableCosineFiltering) { // show actual input to FSK demod
sample = m_dsdDecoder.getFilteredSample();
}
if (m_sampleBufferIndex < (1<<17)) {
m_sampleBufferIndex++;
} else {
m_sampleBufferIndex = 0;
}
m_sampleBuffer[m_sampleBufferIndex] = sample;
if (m_sampleBufferIndex < samplesPerSymbol) {
delayedSample = m_sampleBuffer[(1<<17) - samplesPerSymbol + m_sampleBufferIndex]; // wrap
} else {
delayedSample = m_sampleBuffer[m_sampleBufferIndex - samplesPerSymbol];
}
if (m_settings.m_syncOrConstellation)
{
Sample s(sample, m_dsdDecoder.getSymbolSyncSample());
m_scopeSampleBuffer.push_back(s);
}
else
{
Sample s(sample, delayedSample); // I=signal, Q=signal delayed by 20 samples (2400 baud: lowest rate)
m_scopeSampleBuffer.push_back(s);
}
if (DSPEngine::instance()->hasDVSerialSupport())
{
if ((m_settings.m_slot1On) && m_dsdDecoder.mbeDVReady1())
{
if (!m_settings.m_audioMute)
{
DSPEngine::instance()->pushMbeFrame(
m_dsdDecoder.getMbeDVFrame1(),
m_dsdDecoder.getMbeRateIndex(),
m_settings.m_volume * 10.0,
m_settings.m_tdmaStereo ? 1 : 3, // left or both channels
&m_audioFifo1);
}
m_dsdDecoder.resetMbeDV1();
}
if ((m_settings.m_slot2On) && m_dsdDecoder.mbeDVReady2())
{
if (!m_settings.m_audioMute)
{
DSPEngine::instance()->pushMbeFrame(
m_dsdDecoder.getMbeDVFrame2(),
m_dsdDecoder.getMbeRateIndex(),
m_settings.m_volume * 10.0,
m_settings.m_tdmaStereo ? 2 : 3, // right or both channels
&m_audioFifo2);
}
m_dsdDecoder.resetMbeDV2();
}
}
// if (DSPEngine::instance()->hasDVSerialSupport() && m_dsdDecoder.mbeDVReady1())
// {
// if (!m_settings.m_audioMute)
// {
// DSPEngine::instance()->pushMbeFrame(m_dsdDecoder.getMbeDVFrame1(), m_dsdDecoder.getMbeRateIndex(), m_settings.m_volume, &m_audioFifo1);
// }
//
// m_dsdDecoder.resetMbeDV1();
// }
m_interpolatorDistanceRemain += m_interpolatorDistance;
}
}
if (!DSPEngine::instance()->hasDVSerialSupport())
{
if (m_settings.m_slot1On)
{
int nbAudioSamples;
short *dsdAudio = m_dsdDecoder.getAudio1(nbAudioSamples);
if (nbAudioSamples > 0)
{
if (!m_settings.m_audioMute) {
m_audioFifo1.write((const quint8*) dsdAudio, nbAudioSamples, 10);
}
m_dsdDecoder.resetAudio1();
}
}
if (m_settings.m_slot2On)
{
int nbAudioSamples;
short *dsdAudio = m_dsdDecoder.getAudio2(nbAudioSamples);
if (nbAudioSamples > 0)
{
if (!m_settings.m_audioMute) {
m_audioFifo2.write((const quint8*) dsdAudio, nbAudioSamples, 10);
}
m_dsdDecoder.resetAudio2();
}
}
// int nbAudioSamples;
// short *dsdAudio = m_dsdDecoder.getAudio1(nbAudioSamples);
//
// if (nbAudioSamples > 0)
// {
// if (!m_settings.m_audioMute) {
// uint res = m_audioFifo1.write((const quint8*) dsdAudio, nbAudioSamples, 10);
// }
//
// m_dsdDecoder.resetAudio1();
// }
}
if ((m_scope != 0) && (m_scopeEnabled))
{
m_scope->feed(m_scopeSampleBuffer.begin(), m_scopeSampleBuffer.end(), true); // true = real samples for what it's worth
}
m_settingsMutex.unlock();
}
void DSDDemod::start()
{
m_audioFifo1.clear();
m_audioFifo2.clear();
m_phaseDiscri.reset();
}
void DSDDemod::stop()
{
}
bool DSDDemod::handleMessage(const Message& cmd)
{
qDebug() << "DSDDemod::handleMessage";
if (DownChannelizer::MsgChannelizerNotification::match(cmd))
{
DownChannelizer::MsgChannelizerNotification& notif = (DownChannelizer::MsgChannelizerNotification&) cmd;
DSDDemodSettings settings = m_settings;
settings.m_inputSampleRate = notif.getSampleRate();
settings.m_inputFrequencyOffset = notif.getFrequencyOffset();
applySettings(settings);
qDebug() << "DSDDemod::handleMessage: MsgChannelizerNotification: m_inputSampleRate: " << settings.m_inputSampleRate
<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset;
return true;
}
else if (MsgConfigureChannelizer::match(cmd))
{
MsgConfigureChannelizer& cfg = (MsgConfigureChannelizer&) cmd;
m_channelizer->configure(m_channelizer->getInputMessageQueue(),
cfg.getSampleRate(),
cfg.getCenterFrequency());
return true;
}
else if (MsgConfigureDSDDemod::match(cmd))
{
MsgConfigureDSDDemod& cfg = (MsgConfigureDSDDemod&) cmd;
DSDDemodSettings 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() << "DSDDemod::handleMessage: MsgConfigureDSDDemod: m_rfBandwidth: " << m_settings.m_rfBandwidth
<< " m_fmDeviation: " << m_settings.m_fmDeviation
<< " m_demodGain: " << m_settings.m_demodGain
<< " m_volume: " << m_settings.m_volume
<< " m_baudRate: " << m_settings.m_baudRate
<< " m_squelchGate" << m_settings.m_squelchGate
<< " m_squelch: " << m_settings.m_squelch
<< " m_audioMute: " << m_settings.m_audioMute
<< " m_enableCosineFiltering: " << m_settings.m_enableCosineFiltering
<< " m_syncOrConstellation: " << m_settings.m_syncOrConstellation
<< " m_slot1On: " << m_settings.m_slot1On
<< " m_slot2On: " << m_settings.m_slot2On
<< " m_tdmaStereo: " << m_settings.m_tdmaStereo
<< " m_pllLock: " << m_settings.m_pllLock
<< " m_udpCopyAudio: " << m_settings.m_udpCopyAudio
<< " m_udpAddress: " << m_settings.m_udpAddress
<< " m_udpPort: " << m_settings.m_udpPort
<< " force: " << cfg.getForce();
return true;
}
else if (MsgConfigureMyPosition::match(cmd))
{
MsgConfigureMyPosition& cfg = (MsgConfigureMyPosition&) cmd;
m_dsdDecoder.setMyPoint(cfg.getMyLatitude(), cfg.getMyLongitude());
return true;
}
else
{
return false;
}
}
void DSDDemod::applySettings(DSDDemodSettings& settings, bool force)
{
if ((settings.m_inputFrequencyOffset != m_settings.m_inputFrequencyOffset) ||
(settings.m_inputSampleRate != m_settings.m_inputSampleRate) || force)
{
m_nco.setFreq(-settings.m_inputFrequencyOffset, settings.m_inputSampleRate);
}
if ((settings.m_inputSampleRate != m_settings.m_inputSampleRate) ||
(settings.m_rfBandwidth != m_settings.m_rfBandwidth) || force)
{
m_settingsMutex.lock();
m_interpolator.create(16, settings.m_inputSampleRate, (settings.m_rfBandwidth) / 2.2);
m_interpolatorDistanceRemain = 0;
m_interpolatorDistance = (Real) settings.m_inputSampleRate / (Real) settings.m_audioSampleRate;
m_phaseDiscri.setFMScaling((float) settings.m_rfBandwidth / (float) settings.m_fmDeviation);
m_settingsMutex.unlock();
}
if ((settings.m_fmDeviation != m_settings.m_fmDeviation) || force)
{
m_phaseDiscri.setFMScaling((float) settings.m_rfBandwidth / (float) settings.m_fmDeviation);
}
if ((settings.m_squelchGate != m_settings.m_squelchGate) || force)
{
m_squelchGate = 480 * 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)
{
// input is a value in dB
m_squelchLevel = std::pow(10.0, settings.m_squelch / 10.0);
}
if ((settings.m_volume != m_settings.m_volume) || force)
{
m_dsdDecoder.setAudioGain(settings.m_volume);
}
if ((settings.m_baudRate != m_settings.m_baudRate) || force)
{
m_dsdDecoder.setBaudRate(settings.m_baudRate);
}
if ((settings.m_enableCosineFiltering != m_settings.m_enableCosineFiltering) || force)
{
m_dsdDecoder.enableCosineFiltering(settings.m_enableCosineFiltering);
}
if ((settings.m_tdmaStereo != m_settings.m_tdmaStereo) || force)
{
m_dsdDecoder.setTDMAStereo(settings.m_tdmaStereo);
}
if ((settings.m_pllLock != m_settings.m_pllLock) || force)
{
m_dsdDecoder.setSymbolPLLLock(settings.m_pllLock);
}
if ((settings.m_udpAddress != m_settings.m_udpAddress)
|| (settings.m_udpPort != m_settings.m_udpPort) || force)
{
m_udpBufferAudio->setAddress(settings.m_udpAddress);
m_udpBufferAudio->setPort(settings.m_udpPort);
}
if ((settings.m_udpCopyAudio != m_settings.m_udpCopyAudio)
|| (settings.m_slot1On != m_settings.m_slot1On)
|| (settings.m_slot2On != m_settings.m_slot2On) || force)
{
m_audioFifo1.setCopyToUDP(settings.m_slot1On && settings.m_udpCopyAudio);
m_audioFifo2.setCopyToUDP(settings.m_slot2On && !settings.m_slot1On && settings.m_udpCopyAudio);
}
m_settings = settings;
}
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