mirror of
https://github.com/f4exb/sdrangel.git
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304 lines
9.5 KiB
C++
304 lines
9.5 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// written by Christian Daniel //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QTime>
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#include <QDebug>
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#include <stdio.h>
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#include <complex.h>
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#include <dsp/downchannelizer.h>
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#include "dsp/threadedbasebandsamplesink.h"
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#include <device/devicesourceapi.h>
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#include "audio/audiooutput.h"
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#include "dsp/dspengine.h"
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#include "dsp/pidcontroller.h"
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#include "wfmdemod.h"
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MESSAGE_CLASS_DEFINITION(WFMDemod::MsgConfigureWFMDemod, Message)
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MESSAGE_CLASS_DEFINITION(WFMDemod::MsgConfigureChannelizer, Message)
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const QString WFMDemod::m_channelID = "de.maintech.sdrangelove.channel.wfm";
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WFMDemod::WFMDemod(DeviceSourceAPI* deviceAPI) :
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m_deviceAPI(deviceAPI),
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m_squelchOpen(false),
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m_magsq(0.0f),
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m_magsqSum(0.0f),
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m_magsqPeak(0.0f),
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m_magsqCount(0),
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m_movingAverage(40, 0),
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m_sampleSink(0),
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m_audioFifo(250000),
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m_settingsMutex(QMutex::Recursive)
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{
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setObjectName("WFMDemod");
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m_rfFilter = new fftfilt(-50000.0 / 384000.0, 50000.0 / 384000.0, rfFilterFftLength);
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m_phaseDiscri.setFMScaling(384000/75000);
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m_audioBuffer.resize(16384);
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m_audioBufferFill = 0;
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m_movingAverage.resize(16, 0);
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DSPEngine::instance()->addAudioSink(&m_audioFifo);
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m_channelizer = new DownChannelizer(this);
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m_threadedChannelizer = new ThreadedBasebandSampleSink(m_channelizer, this);
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m_deviceAPI->addThreadedSink(m_threadedChannelizer);
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applySettings(m_settings, true);
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}
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WFMDemod::~WFMDemod()
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{
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if (m_rfFilter)
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{
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delete m_rfFilter;
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}
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DSPEngine::instance()->removeAudioSink(&m_audioFifo);
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m_deviceAPI->removeThreadedSink(m_threadedChannelizer);
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delete m_threadedChannelizer;
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delete m_channelizer;
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}
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void WFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst __attribute__((unused)))
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{
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Complex ci;
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fftfilt::cmplx *rf;
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int rf_out;
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Real demod;
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double msq;
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float fmDev;
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m_settingsMutex.lock();
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for (SampleVector::const_iterator it = begin; it != end; ++it)
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{
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//Complex c(it->real() / 32768.0f, it->imag() / 32768.0f);
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Complex c(it->real(), it->imag());
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c *= m_nco.nextIQ();
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rf_out = m_rfFilter->runFilt(c, &rf); // filter RF before demod
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for (int i = 0 ; i < rf_out; i++)
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{
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demod = m_phaseDiscri.phaseDiscriminatorDelta(rf[i], msq, fmDev);
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Real magsq = msq / (1<<30);
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m_movingAverage.feed(magsq);
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m_magsqSum += magsq;
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if (magsq > m_magsqPeak)
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{
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m_magsqPeak = magsq;
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}
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m_magsqCount++;
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if(m_movingAverage.average() >= m_squelchLevel)
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m_squelchState = m_settings.m_rfBandwidth / 20; // decay rate
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if (m_squelchState > 0)
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{
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m_squelchState--;
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m_squelchOpen = true;
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}
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else
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{
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demod = 0;
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m_squelchOpen = false;
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}
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if (m_settings.m_audioMute)
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{
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demod = 0;
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}
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Complex e(demod, 0);
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if(m_interpolator.decimate(&m_interpolatorDistanceRemain, e, &ci))
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{
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quint16 sample = (qint16)(ci.real() * 3276.8f * m_settings.m_volume);
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m_sampleBuffer.push_back(Sample(sample, sample));
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m_audioBuffer[m_audioBufferFill].l = sample;
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m_audioBuffer[m_audioBufferFill].r = sample;
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++m_audioBufferFill;
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if(m_audioBufferFill >= m_audioBuffer.size())
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{
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uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 1);
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if(res != m_audioBufferFill)
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{
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qDebug("WFMDemod::feed: %u/%u audio samples written", res, m_audioBufferFill);
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}
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m_audioBufferFill = 0;
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}
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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}
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if(m_audioBufferFill > 0)
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{
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uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 1);
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if(res != m_audioBufferFill)
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{
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qDebug("WFMDemod::feed: %u/%u tail samples written", res, m_audioBufferFill);
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}
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m_audioBufferFill = 0;
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}
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if(m_sampleSink != NULL)
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{
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m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), false);
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}
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m_sampleBuffer.clear();
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m_settingsMutex.unlock();
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}
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void WFMDemod::start()
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{
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m_squelchState = 0;
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m_audioFifo.clear();
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m_phaseDiscri.reset();
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}
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void WFMDemod::stop()
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{
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}
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bool WFMDemod::handleMessage(const Message& cmd)
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{
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if (DownChannelizer::MsgChannelizerNotification::match(cmd))
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{
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DownChannelizer::MsgChannelizerNotification& notif = (DownChannelizer::MsgChannelizerNotification&) cmd;
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WFMDemodSettings settings = m_settings;
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settings.m_inputSampleRate = notif.getSampleRate();
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settings.m_inputFrequencyOffset = notif.getFrequencyOffset();
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applySettings(settings);
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qDebug() << "WFMDemod::handleMessage: MsgChannelizerNotification: m_inputSampleRate: " << settings.m_inputSampleRate
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<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset;
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return true;
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}
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else if (MsgConfigureChannelizer::match(cmd))
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{
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MsgConfigureChannelizer& cfg = (MsgConfigureChannelizer&) cmd;
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m_channelizer->configure(m_channelizer->getInputMessageQueue(),
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cfg.getSampleRate(),
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cfg.getCenterFrequency());
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qDebug() << "WFMDemod::handleMessage: MsgConfigureChannelizer:"
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<< " sampleRate: " << cfg.getSampleRate()
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<< " inputFrequencyOffset: " << cfg.getCenterFrequency();
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return true;
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}
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else if (MsgConfigureWFMDemod::match(cmd))
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{
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MsgConfigureWFMDemod& cfg = (MsgConfigureWFMDemod&) cmd;
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WFMDemodSettings settings = cfg.getSettings();
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// These settings are set with DownChannelizer::MsgChannelizerNotification
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settings.m_inputSampleRate = m_settings.m_inputSampleRate;
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settings.m_inputFrequencyOffset = m_settings.m_inputFrequencyOffset;
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applySettings(settings, cfg.getForce());
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qDebug() << "WFMDemod::handleMessage: MsgConfigureWFMDemod:"
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<< " m_rfBandwidth: " << settings.m_rfBandwidth
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<< " m_afBandwidth: " << settings.m_afBandwidth
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<< " m_volume: " << settings.m_volume
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<< " m_squelch: " << settings.m_squelch
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<< " m_copyAudioToUDP: " << settings.m_copyAudioToUDP
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<< " m_udpAddress: " << settings.m_udpAddress
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<< " m_udpPort: " << settings.m_udpPort
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<< " force: " << cfg.getForce();
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return true;
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}
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else
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{
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if (m_sampleSink != 0)
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{
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return m_sampleSink->handleMessage(cmd);
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}
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else
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{
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return false;
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}
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}
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}
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void WFMDemod::applySettings(const WFMDemodSettings& settings, bool force)
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{
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if((settings.m_inputFrequencyOffset != m_settings.m_inputFrequencyOffset) ||
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(settings.m_inputSampleRate != m_settings.m_inputSampleRate) || force)
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{
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qDebug() << "WFMDemod::applySettings: m_nco.setFreq";
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m_nco.setFreq(-settings.m_inputFrequencyOffset, settings.m_inputSampleRate);
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}
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if((settings.m_inputSampleRate != m_settings.m_inputSampleRate) ||
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(settings.m_audioSampleRate != m_settings.m_audioSampleRate) ||
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(settings.m_afBandwidth != m_settings.m_afBandwidth) ||
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(settings.m_rfBandwidth != m_settings.m_rfBandwidth) || force)
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{
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m_settingsMutex.lock();
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qDebug() << "WFMDemod::applySettings: m_interpolator.create";
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m_interpolator.create(16, settings.m_inputSampleRate, settings.m_afBandwidth);
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m_interpolatorDistanceRemain = (Real) settings.m_inputSampleRate / (Real) settings.m_audioSampleRate;
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m_interpolatorDistance = (Real) settings.m_inputSampleRate / (Real) settings.m_audioSampleRate;
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qDebug() << "WFMDemod::applySettings: m_rfFilter->create_filter";
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Real lowCut = -(settings.m_rfBandwidth / 2.0) / settings.m_inputSampleRate;
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Real hiCut = (settings.m_rfBandwidth / 2.0) / settings.m_inputSampleRate;
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m_rfFilter->create_filter(lowCut, hiCut);
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m_fmExcursion = settings.m_rfBandwidth / (Real) settings.m_inputSampleRate;
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m_phaseDiscri.setFMScaling(1.0f/m_fmExcursion);
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qDebug("WFMDemod::applySettings: m_fmExcursion: %f", m_fmExcursion);
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m_settingsMutex.unlock();
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}
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if ((settings.m_squelch != m_settings.m_squelch) || force)
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{
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qDebug() << "WFMDemod::applySettings: set m_squelchLevel";
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m_squelchLevel = pow(10.0, settings.m_squelch / 20.0);
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m_squelchLevel *= m_squelchLevel;
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}
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m_settings = settings;
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}
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