mirror of
https://github.com/f4exb/sdrangel.git
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467 lines
15 KiB
C++
467 lines
15 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015 F4EXB //
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// written by Edouard Griffiths //
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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 "audio/audiooutput.h"
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#include "dsp/dspengine.h"
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#include "dsp/pidcontroller.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 "rdsparser.h"
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#include "bfmdemod.h"
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MESSAGE_CLASS_DEFINITION(BFMDemod::MsgConfigureChannelizer, Message)
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MESSAGE_CLASS_DEFINITION(BFMDemod::MsgReportChannelSampleRateChanged, Message)
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MESSAGE_CLASS_DEFINITION(BFMDemod::MsgConfigureBFMDemod, Message)
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const QString BFMDemod::m_channelID = "sdrangel.channel.bfm";
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const Real BFMDemod::default_deemphasis = 50.0; // 50 us
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const int BFMDemod::m_udpBlockSize = 512;
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BFMDemod::BFMDemod(DeviceSourceAPI *deviceAPI) :
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m_deviceAPI(deviceAPI),
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m_audioFifo(250000),
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m_settingsMutex(QMutex::Recursive),
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m_pilotPLL(19000/384000, 50/384000, 0.01),
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m_deemphasisFilterX(default_deemphasis * 48000 * 1.0e-6),
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m_deemphasisFilterY(default_deemphasis * 48000 * 1.0e-6),
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m_fmExcursion(default_excursion)
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{
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setObjectName("BFMDemod");
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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_squelchLevel = 0;
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m_squelchState = 0;
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m_interpolatorDistance = 0.0f;
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m_interpolatorDistanceRemain = 0.0f;
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m_interpolatorRDSDistance = 0.0f;
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m_interpolatorRDSDistanceRemain = 0.0f;
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m_interpolatorStereoDistance = 0.0f;
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m_interpolatorStereoDistanceRemain = 0.0f;
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m_sampleSink = 0;
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m_m1Arg = 0;
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m_rfFilter = new fftfilt(-50000.0 / 384000.0, 50000.0 / 384000.0, filtFftLen);
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m_deemphasisFilterX.configure(default_deemphasis * m_settings.m_audioSampleRate * 1.0e-6);
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m_deemphasisFilterY.configure(default_deemphasis * m_settings.m_audioSampleRate * 1.0e-6);
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m_phaseDiscri.setFMScaling(384000/m_fmExcursion);
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m_audioBuffer.resize(16384);
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m_audioBufferFill = 0;
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DSPEngine::instance()->addAudioSink(&m_audioFifo);
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m_udpBufferAudio = new UDPSink<AudioSample>(this, m_udpBlockSize, m_settings.m_udpPort);
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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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BFMDemod::~BFMDemod()
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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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delete m_udpBufferAudio;
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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 BFMDemod::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, cs, cr;
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fftfilt::cmplx *rf;
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int rf_out;
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double msq;
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Real demod;
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m_sampleBuffer.clear();
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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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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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msq = rf[i].real()*rf[i].real() + rf[i].imag()*rf[i].imag();
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m_magsqSum += msq;
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if (msq > m_magsqPeak)
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{
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m_magsqPeak = msq;
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}
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m_magsqCount++;
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// m_movingAverage.feed(msq);
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if(m_magsq >= m_squelchLevel) {
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m_squelchState = m_settings.m_rfBandwidth / 20; // decay rate
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}
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if(m_squelchState > 0)
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{
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m_squelchState--;
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//demod = phaseDiscriminator2(rf[i], msq);
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demod = m_phaseDiscri.phaseDiscriminator(rf[i]);
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}
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else
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{
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demod = 0;
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}
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if (!m_settings.m_showPilot)
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{
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m_sampleBuffer.push_back(Sample(demod * (1<<15), 0.0));
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}
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if (m_settings.m_rdsActive)
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{
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//Complex r(demod * 2.0 * std::cos(3.0 * m_pilotPLLSamples[3]), 0.0);
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Complex r(demod * 2.0 * std::cos(3.0 * m_pilotPLLSamples[3]), 0.0);
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if (m_interpolatorRDS.decimate(&m_interpolatorRDSDistanceRemain, r, &cr))
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{
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bool bit;
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if (m_rdsDemod.process(cr.real(), bit))
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{
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if (m_rdsDecoder.frameSync(bit))
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{
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m_rdsParser.parseGroup(m_rdsDecoder.getGroup());
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}
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}
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m_interpolatorRDSDistanceRemain += m_interpolatorRDSDistance;
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}
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}
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Real sampleStereo = 0.0f;
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// Process stereo if stereo mode is selected
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if (m_settings.m_audioStereo)
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{
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m_pilotPLL.process(demod, m_pilotPLLSamples);
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if (m_settings.m_showPilot)
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{
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m_sampleBuffer.push_back(Sample(m_pilotPLLSamples[1] * (1<<15), 0.0)); // debug 38 kHz pilot
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}
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if (m_settings.m_lsbStereo)
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{
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// 1.17 * 0.7 = 0.819
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Complex s(demod * m_pilotPLLSamples[1], demod * m_pilotPLLSamples[2]);
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if (m_interpolatorStereo.decimate(&m_interpolatorStereoDistanceRemain, s, &cs))
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{
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sampleStereo = cs.real() + cs.imag();
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m_interpolatorStereoDistanceRemain += m_interpolatorStereoDistance;
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}
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}
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else
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{
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Complex s(demod * 1.17 * m_pilotPLLSamples[1], 0);
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if (m_interpolatorStereo.decimate(&m_interpolatorStereoDistanceRemain, s, &cs))
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{
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sampleStereo = cs.real();
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m_interpolatorStereoDistanceRemain += m_interpolatorStereoDistance;
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}
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}
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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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if (m_settings.m_audioStereo)
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{
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Real deemph_l, deemph_r; // Pre-emphasis is applied on each channel before multiplexing
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m_deemphasisFilterX.process(ci.real() + sampleStereo, deemph_l);
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m_deemphasisFilterY.process(ci.real() - sampleStereo, deemph_r);
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if (m_settings.m_lsbStereo)
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{
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m_audioBuffer[m_audioBufferFill].l = (qint16)(deemph_l * (1<<12) * m_settings.m_volume);
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m_audioBuffer[m_audioBufferFill].r = (qint16)(deemph_r * (1<<12) * m_settings.m_volume);
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if (m_settings.m_copyAudioToUDP) m_udpBufferAudio->write(m_audioBuffer[m_audioBufferFill]);
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}
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else
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{
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m_audioBuffer[m_audioBufferFill].l = (qint16)(deemph_l * (1<<12) * m_settings.m_volume);
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m_audioBuffer[m_audioBufferFill].r = (qint16)(deemph_r * (1<<12) * m_settings.m_volume);
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if (m_settings.m_copyAudioToUDP) m_udpBufferAudio->write(m_audioBuffer[m_audioBufferFill]);
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}
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}
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else
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{
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Real deemph;
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m_deemphasisFilterX.process(ci.real(), deemph);
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quint16 sample = (qint16)(deemph * (1<<12) * m_settings.m_volume);
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m_audioBuffer[m_audioBufferFill].l = sample;
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m_audioBuffer[m_audioBufferFill].r = sample;
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if (m_settings.m_copyAudioToUDP) m_udpBufferAudio->write(m_audioBuffer[m_audioBufferFill]);
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}
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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("BFMDemod::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("BFMDemod::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 != 0)
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{
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m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), true);
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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 BFMDemod::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 BFMDemod::stop()
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{
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}
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bool BFMDemod::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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BFMDemodSettings 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() << "BFMDemod::handleMessage: MsgChannelizerNotification:"
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<< " m_inputSampleRate: " << settings.m_inputSampleRate
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<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset;
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if (getMessageQueueToGUI())
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{
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MsgReportChannelSampleRateChanged *msg = MsgReportChannelSampleRateChanged::create(getSampleRate());
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getMessageQueueToGUI()->push(msg);
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}
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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() << "BFMDemod::handleMessage: MsgConfigureChannelizer: sampleRate: " << cfg.getSampleRate()
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<< " centerFrequency: " << cfg.getCenterFrequency();
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return true;
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}
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else if (MsgConfigureBFMDemod::match(cmd))
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{
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MsgConfigureBFMDemod& cfg = (MsgConfigureBFMDemod&) cmd;
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BFMDemodSettings 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() << "BFMDemod::handleMessage: MsgConfigureBFMDemod:"
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<< " m_rfBandwidth: " << settings.m_rfBandwidth
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<< " m_volume: " << settings.m_volume
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<< " m_squelch: " << settings.m_squelch
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<< " m_audioStereo: " << settings.m_audioStereo
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<< " m_lsbStereo: " << settings.m_lsbStereo
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<< " m_showPilot: " << settings.m_showPilot
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<< " m_rdsActive: " << settings.m_rdsActive
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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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qDebug() << "BFMDemod::handleMessage: passed: " << cmd.getIdentifier();
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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 BFMDemod::applySettings(const BFMDemodSettings& settings, bool force)
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{
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if ((settings.m_inputSampleRate != m_settings.m_inputSampleRate)
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|| (settings.m_audioStereo && (settings.m_audioStereo != m_settings.m_audioStereo)) || force)
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{
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m_pilotPLL.configure(19000.0/settings.m_inputSampleRate, 50.0/settings.m_inputSampleRate, 0.01);
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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() << "BFMDemod::handleMessage: 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_afBandwidth != m_settings.m_afBandwidth) || force)
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{
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m_settingsMutex.lock();
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qDebug() << "BFMDemod::handleMessage: 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 / settings.m_audioSampleRate;
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m_interpolatorDistance = (Real) settings.m_inputSampleRate / (Real) settings.m_audioSampleRate;
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m_interpolatorStereo.create(16, settings.m_inputSampleRate, settings.m_afBandwidth);
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m_interpolatorStereoDistanceRemain = (Real) settings.m_inputSampleRate / settings.m_audioSampleRate;
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m_interpolatorStereoDistance = (Real) settings.m_inputSampleRate / (Real) settings.m_audioSampleRate;
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m_interpolatorRDS.create(4, settings.m_inputSampleRate, 600.0);
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m_interpolatorRDSDistanceRemain = (Real) settings.m_inputSampleRate / 250000.0;
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m_interpolatorRDSDistance = (Real) settings.m_inputSampleRate / 250000.0;
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m_settingsMutex.unlock();
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}
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if((settings.m_inputSampleRate != m_settings.m_inputSampleRate) ||
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(settings.m_rfBandwidth != m_settings.m_rfBandwidth) ||
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(settings.m_inputFrequencyOffset != m_settings.m_inputFrequencyOffset) || force)
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{
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m_settingsMutex.lock();
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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_phaseDiscri.setFMScaling(settings.m_inputSampleRate / m_fmExcursion);
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m_settingsMutex.unlock();
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qDebug() << "BFMDemod::handleMessage: m_rfFilter->create_filter: sampleRate: "
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<< settings.m_inputSampleRate
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<< " lowCut: " << lowCut * settings.m_inputSampleRate
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<< " hiCut: " << hiCut * settings.m_inputSampleRate;
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}
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if ((settings.m_afBandwidth != m_settings.m_afBandwidth) ||
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(settings.m_audioSampleRate != m_settings.m_audioSampleRate) || force)
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{
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m_settingsMutex.lock();
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qDebug() << "BFMDemod::handleMessage: m_lowpass.create";
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m_lowpass.create(21, settings.m_audioSampleRate, settings.m_afBandwidth);
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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() << "BFMDemod::handleMessage: set m_squelchLevel";
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m_squelchLevel = std::pow(10.0, settings.m_squelch / 20.0);
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m_squelchLevel *= m_squelchLevel;
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}
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if ((settings.m_audioSampleRate != m_settings.m_audioSampleRate) || force)
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{
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m_deemphasisFilterX.configure(default_deemphasis * settings.m_audioSampleRate * 1.0e-6);
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m_deemphasisFilterY.configure(default_deemphasis * settings.m_audioSampleRate * 1.0e-6);
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}
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if ((settings.m_udpAddress != m_settings.m_udpAddress)
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|| (settings.m_udpPort != m_settings.m_udpPort) || force)
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{
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m_udpBufferAudio->setAddress(const_cast<QString&>(settings.m_udpAddress));
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m_udpBufferAudio->setPort(settings.m_udpPort);
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}
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m_settings = settings;
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}
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