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427 lines
13 KiB
C++
427 lines
13 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/channelizer.h"
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#include "dsp/pidcontroller.h"
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#include "rdsparser.h"
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#include "bfmdemod.h"
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MESSAGE_CLASS_DEFINITION(BFMDemod::MsgConfigureBFMDemod, Message)
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const Real BFMDemod::default_deemphasis = 50.0; // 50 us
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BFMDemod::BFMDemod(SampleSink* sampleSink, RDSParser *rdsParser) :
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m_sampleSink(sampleSink),
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m_rdsParser(rdsParser),
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m_audioFifo(4, 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_config.m_inputSampleRate = 384000;
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m_config.m_inputFrequencyOffset = 0;
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m_config.m_rfBandwidth = 180000;
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m_config.m_afBandwidth = 15000;
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m_config.m_squelch = -60.0;
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m_config.m_volume = 2.0;
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m_config.m_audioSampleRate = DSPEngine::instance()->getAudioSampleRate(); // normally 48 kHz
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m_deemphasisFilterX.configure(default_deemphasis * m_config.m_audioSampleRate * 1.0e-6);
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m_deemphasisFilterY.configure(default_deemphasis * m_config.m_audioSampleRate * 1.0e-6);
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m_rfFilter = new fftfilt(-50000.0 / 384000.0, 50000.0 / 384000.0, filtFftLen);
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m_phaseDiscri.setFMScaling(384000/m_fmExcursion);
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apply();
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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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}
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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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}
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void BFMDemod::configure(MessageQueue* messageQueue,
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Real rfBandwidth,
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Real afBandwidth,
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Real volume,
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Real squelch,
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bool audioStereo,
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bool lsbStereo,
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bool showPilot,
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bool rdsActive)
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{
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Message* cmd = MsgConfigureBFMDemod::create(rfBandwidth,
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afBandwidth,
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volume,
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squelch,
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audioStereo,
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lsbStereo,
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showPilot,
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rdsActive);
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messageQueue->push(cmd);
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}
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void BFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst)
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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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Real msq, 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_movingAverage.feed(msq);
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if(m_movingAverage.average() >= m_squelchLevel)
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m_squelchState = m_running.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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//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_running.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_running.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.interpolate(&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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if (m_rdsParser)
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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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}
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m_interpolatorRDSDistanceRemain += m_interpolatorRDSDistance;
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}
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}
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Real sampleStereo;
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// Process stereo if stereo mode is selected
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if (m_running.m_audioStereo)
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{
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m_pilotPLL.process(demod, m_pilotPLLSamples);
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if (m_running.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_running.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.interpolate(&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.interpolate(&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.interpolate(&m_interpolatorDistanceRemain, e, &ci))
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{
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if (m_running.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_running.m_lsbStereo)
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{
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m_audioBuffer[m_audioBufferFill].l = (qint16)(deemph_l * (1<<12) * m_running.m_volume);
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m_audioBuffer[m_audioBufferFill].r = (qint16)(deemph_r * (1<<12) * m_running.m_volume);
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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_running.m_volume);
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m_audioBuffer[m_audioBufferFill].r = (qint16)(deemph_r * (1<<12) * m_running.m_volume);
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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_running.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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}
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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 (Channelizer::MsgChannelizerNotification::match(cmd))
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{
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Channelizer::MsgChannelizerNotification& notif = (Channelizer::MsgChannelizerNotification&) cmd;
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m_config.m_inputSampleRate = notif.getSampleRate();
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m_config.m_inputFrequencyOffset = notif.getFrequencyOffset();
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apply();
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qDebug() << "BFMDemod::handleMessage: MsgChannelizerNotification: m_inputSampleRate: " << m_config.m_inputSampleRate
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<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
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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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m_config.m_rfBandwidth = cfg.getRFBandwidth();
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m_config.m_afBandwidth = cfg.getAFBandwidth();
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m_config.m_volume = cfg.getVolume();
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m_config.m_squelch = cfg.getSquelch();
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m_config.m_audioStereo = cfg.getAudioStereo();
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m_config.m_lsbStereo = cfg.getLsbStereo();
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m_config.m_showPilot = cfg.getShowPilot();
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m_config.m_rdsActive = cfg.getRDSActive();
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apply();
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qDebug() << "BFMDemod::handleMessage: MsgConfigureBFMDemod: m_rfBandwidth: " << m_config.m_rfBandwidth
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<< " m_afBandwidth: " << m_config.m_afBandwidth
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<< " m_volume: " << m_config.m_volume
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<< " m_squelch: " << m_config.m_squelch
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<< " m_audioStereo: " << m_config.m_audioStereo
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<< " m_lsbStereo: " << m_config.m_lsbStereo
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<< " m_showPilot: " << m_config.m_showPilot
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<< " m_rdsActive: " << m_config.m_rdsActive;
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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: none";
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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::apply()
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{
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if ((m_config.m_inputSampleRate != m_running.m_inputSampleRate)
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|| (m_config.m_audioStereo && (m_config.m_audioStereo != m_running.m_audioStereo)))
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{
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m_pilotPLL.configure(19000.0/m_config.m_inputSampleRate, 50.0/m_config.m_inputSampleRate, 0.01);
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}
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if((m_config.m_inputFrequencyOffset != m_running.m_inputFrequencyOffset) ||
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(m_config.m_inputSampleRate != m_running.m_inputSampleRate))
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{
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qDebug() << "BFMDemod::handleMessage: m_nco.setFreq";
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m_nco.setFreq(-m_config.m_inputFrequencyOffset, m_config.m_inputSampleRate);
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}
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if((m_config.m_inputSampleRate != m_running.m_inputSampleRate) ||
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(m_config.m_afBandwidth != m_running.m_afBandwidth))
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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, m_config.m_inputSampleRate, m_config.m_afBandwidth);
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m_interpolatorDistanceRemain = (Real) m_config.m_inputSampleRate / m_config.m_audioSampleRate;
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m_interpolatorDistance = (Real) m_config.m_inputSampleRate / (Real) m_config.m_audioSampleRate;
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m_interpolatorStereo.create(16, m_config.m_inputSampleRate, m_config.m_afBandwidth);
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m_interpolatorStereoDistanceRemain = (Real) m_config.m_inputSampleRate / m_config.m_audioSampleRate;
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m_interpolatorStereoDistance = (Real) m_config.m_inputSampleRate / (Real) m_config.m_audioSampleRate;
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m_interpolatorRDS.create(4, m_config.m_inputSampleRate, 600.0);
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m_interpolatorRDSDistanceRemain = (Real) m_config.m_inputSampleRate / 250000.0;
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m_interpolatorRDSDistance = (Real) m_config.m_inputSampleRate / 250000.0;
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m_settingsMutex.unlock();
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}
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if((m_config.m_inputSampleRate != m_running.m_inputSampleRate) ||
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(m_config.m_rfBandwidth != m_running.m_rfBandwidth) ||
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(m_config.m_inputFrequencyOffset != m_running.m_inputFrequencyOffset))
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{
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m_settingsMutex.lock();
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Real lowCut = -(m_config.m_rfBandwidth / 2.0) / m_config.m_inputSampleRate;
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Real hiCut = (m_config.m_rfBandwidth / 2.0) / m_config.m_inputSampleRate;
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m_rfFilter->create_filter(lowCut, hiCut);
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m_phaseDiscri.setFMScaling(m_config.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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<< m_config.m_inputSampleRate
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<< " lowCut: " << lowCut * m_config.m_inputSampleRate
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<< " hiCut: " << hiCut * m_config.m_inputSampleRate;
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}
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if((m_config.m_afBandwidth != m_running.m_afBandwidth) ||
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(m_config.m_audioSampleRate != m_running.m_audioSampleRate))
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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, m_config.m_audioSampleRate, m_config.m_afBandwidth);
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m_settingsMutex.unlock();
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}
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if(m_config.m_squelch != m_running.m_squelch) {
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qDebug() << "BFMDemod::handleMessage: set m_squelchLevel";
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m_squelchLevel = std::pow(10.0, m_config.m_squelch / 20.0);
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m_squelchLevel *= m_squelchLevel;
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}
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if (m_config.m_audioSampleRate != m_running.m_audioSampleRate)
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{
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m_deemphasisFilterX.configure(default_deemphasis * m_config.m_audioSampleRate * 1.0e-6);
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m_deemphasisFilterY.configure(default_deemphasis * m_config.m_audioSampleRate * 1.0e-6);
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}
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m_running.m_inputSampleRate = m_config.m_inputSampleRate;
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m_running.m_inputFrequencyOffset = m_config.m_inputFrequencyOffset;
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m_running.m_rfBandwidth = m_config.m_rfBandwidth;
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m_running.m_afBandwidth = m_config.m_afBandwidth;
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m_running.m_squelch = m_config.m_squelch;
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m_running.m_volume = m_config.m_volume;
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m_running.m_audioSampleRate = m_config.m_audioSampleRate;
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m_running.m_audioStereo = m_config.m_audioStereo;
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m_running.m_lsbStereo = m_config.m_lsbStereo;
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m_running.m_showPilot = m_config.m_showPilot;
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m_running.m_rdsActive = m_config.m_rdsActive;
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}
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