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332 lines
10 KiB
C++
332 lines
10 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 "dsddemod.h"
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#include "dsddemodgui.h"
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#include "audio/audiooutput.h"
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#include "dsp/channelizer.h"
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#include "dsp/pidcontroller.h"
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#include "dsp/dspengine.h"
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static const Real afSqTones[2] = {1200.0, 6400.0}; // {1200.0, 8000.0};
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MESSAGE_CLASS_DEFINITION(DSDDemod::MsgConfigureDSDDemod, Message)
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DSDDemod::DSDDemod(SampleSink* sampleSink) :
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m_sampleCount(0),
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m_squelchCount(0),
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m_squelchOpen(false),
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m_audioFifo(4, 48000),
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m_fmExcursion(24),
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m_settingsMutex(QMutex::Recursive),
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m_scope(sampleSink),
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m_scopeEnabled(true),
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m_dsdDecoder()
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{
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setObjectName("DSDDemod");
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m_config.m_inputSampleRate = 96000;
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m_config.m_inputFrequencyOffset = 0;
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m_config.m_rfBandwidth = 100;
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m_config.m_demodGain = 100;
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m_config.m_fmDeviation = 100;
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m_config.m_squelchGate = 5; // 10s of ms at 48000 Hz sample rate. Corresponds to 2400 for AGC attack
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m_config.m_squelch = -30.0;
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m_config.m_volume = 1.0;
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m_config.m_audioMute = false;
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m_config.m_audioSampleRate = DSPEngine::instance()->getAudioSampleRate();
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apply();
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m_audioBuffer.resize(1<<14);
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m_audioBufferFill = 0;
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m_sampleBuffer = new qint16[1<<17]; // 128 kS
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m_sampleBufferIndex = 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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DSDDemod::~DSDDemod()
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{
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delete[] m_sampleBuffer;
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DSPEngine::instance()->removeAudioSink(&m_audioFifo);
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}
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void DSDDemod::configure(MessageQueue* messageQueue,
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int rfBandwidth,
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int demodGain,
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int fmDeviation,
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int volume,
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int squelchGate,
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Real squelch,
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bool audioMute)
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{
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Message* cmd = MsgConfigureDSDDemod::create(rfBandwidth,
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demodGain,
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fmDeviation,
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volume,
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squelchGate,
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squelch,
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audioMute);
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messageQueue->push(cmd);
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}
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void DSDDemod::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst)
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{
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Complex ci;
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m_settingsMutex.lock();
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m_scopeSampleBuffer.clear();
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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(), it->imag());
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c *= m_nco.nextIQ();
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if (m_interpolator.interpolate(&m_interpolatorDistanceRemain, c, &ci))
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{
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qint16 sample, delayedSample;
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m_magsq = ((ci.real()*ci.real() + ci.imag()*ci.imag())) / (Real) (1<<30);
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m_movingAverage.feed(m_magsq);
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Real demod = 32768.0f * m_phaseDiscri.phaseDiscriminator(ci) * ((float) m_running.m_demodGain / 100.0f);
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m_sampleCount++;
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// AF processing
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if (getMagSq() > m_squelchLevel)
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{
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if (m_squelchCount < m_squelchGate)
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{
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m_squelchCount++;
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}
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}
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else
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{
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m_squelchCount = 0;
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}
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m_squelchOpen = m_squelchCount == m_squelchGate;
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if (m_squelchOpen)
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{
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sample = demod;
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}
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else
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{
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sample = 0;
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}
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if (m_sampleBufferIndex < (1<<17)) {
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m_sampleBufferIndex++;
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} else {
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m_sampleBufferIndex = 0;
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}
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m_sampleBuffer[m_sampleBufferIndex] = sample;
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if (m_sampleBufferIndex < 20) {
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delayedSample = m_sampleBuffer[(1<<17) - 20 + m_sampleBufferIndex];
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} else {
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delayedSample = m_sampleBuffer[m_sampleBufferIndex - 20];
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}
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Sample s(sample, delayedSample); // I=signal, Q=signal delayed by 20 samples (2400 baud: lowest rate)
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m_scopeSampleBuffer.push_back(s);
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m_dsdDecoder.pushSample(sample);
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// if (m_running.m_audioMute)
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// {
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// m_audioBuffer[m_audioBufferFill].l = 0;
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// m_audioBuffer[m_audioBufferFill].r = 0;
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// }
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// else
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// {
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// m_audioBuffer[m_audioBufferFill].l = (sample * m_running.m_volume) / 100;
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// m_audioBuffer[m_audioBufferFill].r = (sample * m_running.m_volume) / 100;
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// }
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//
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// ++m_audioBufferFill;
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//
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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, 10);
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//
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// if (res != m_audioBufferFill)
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// {
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// qDebug("DSDDemod::feed: %u/%u audio samples written", res, m_audioBufferFill);
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// }
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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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// if (m_audioBufferFill > 0)
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// {
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// uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 10);
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//
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// if (res != m_audioBufferFill)
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// {
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// qDebug("NFMDemod::feed: %u/%u tail samples written", res, m_audioBufferFill);
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// }
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//
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// m_audioBufferFill = 0;
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// }
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int nbAudioSamples;
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short *dsdAudio = m_dsdDecoder.getAudio(nbAudioSamples);
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if (nbAudioSamples > 0)
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{
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uint res = m_audioFifo.write((const quint8*) dsdAudio, nbAudioSamples, 10);
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qDebug("DSDDemod::feed: written %d audio samples (%d)", res, nbAudioSamples);
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m_dsdDecoder.resetAudio();
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// qDebug("\nDSDDemod::feed: got %d audio samples (%lu)", nbAudioSamples, m_audioBuffer.size());
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}
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// if (nbAudioSamples >= m_audioBuffer.size())
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// {
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// uint res = m_audioFifo.write((const quint8*) dsdAudio, nbAudioSamples, 10);
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// qDebug("DSDDemod::feed: written %d audio samples (%d)", res, nbAudioSamples);
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// m_dsdDecoder.resetAudio();
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// }
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if ((m_scope != 0) && (m_scopeEnabled))
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{
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m_scope->feed(m_scopeSampleBuffer.begin(), m_scopeSampleBuffer.end(), true); // true = real samples for what it's worth
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}
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m_settingsMutex.unlock();
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}
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void DSDDemod::start()
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{
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m_audioFifo.clear();
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m_phaseDiscri.reset();
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}
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void DSDDemod::stop()
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{
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}
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bool DSDDemod::handleMessage(const Message& cmd)
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{
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qDebug() << "DSDDemod::handleMessage";
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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() << "DSDDemod::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 (MsgConfigureDSDDemod::match(cmd))
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{
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MsgConfigureDSDDemod& cfg = (MsgConfigureDSDDemod&) cmd;
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m_config.m_rfBandwidth = cfg.getRFBandwidth();
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m_config.m_demodGain = cfg.getDemodGain();
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m_config.m_fmDeviation = cfg.getFMDeviation();
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m_config.m_volume = cfg.getVolume();
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m_config.m_squelchGate = cfg.getSquelchGate();
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m_config.m_squelch = cfg.getSquelch();
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m_config.m_audioMute = cfg.getAudioMute();
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apply();
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qDebug() << "DSDDemod::handleMessage: MsgConfigureDSDDemod: m_rfBandwidth: " << m_config.m_rfBandwidth * 100
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<< " m_demodGain: " << m_config.m_demodGain / 100.0
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<< " m_fmDeviation: " << m_config.m_fmDeviation * 100
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<< " m_volume: " << m_config.m_volume / 10.0
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<< " m_squelchGate" << m_config.m_squelchGate
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<< " m_squelch: " << m_config.m_squelch
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<< " m_audioMute: " << m_config.m_audioMute;
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return true;
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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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void DSDDemod::apply()
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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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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_rfBandwidth != m_running.m_rfBandwidth))
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{
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m_settingsMutex.lock();
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m_interpolator.create(16, m_config.m_inputSampleRate, (m_config.m_rfBandwidth * 100) / 2.2);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) m_config.m_inputSampleRate / (Real) m_config.m_audioSampleRate;
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m_phaseDiscri.setFMScaling((float) m_config.m_rfBandwidth / (float) m_config.m_fmDeviation);
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m_settingsMutex.unlock();
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}
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if (m_config.m_fmDeviation != m_running.m_fmDeviation)
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{
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m_phaseDiscri.setFMScaling((float) m_config.m_rfBandwidth / (float) m_config.m_fmDeviation);
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}
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if (m_config.m_squelchGate != m_running.m_squelchGate)
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{
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m_squelchGate = 480 * m_config.m_squelchGate; // gate is given in 10s of ms at 48000 Hz audio sample rate
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}
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if (m_config.m_squelch != m_running.m_squelch)
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{
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// input is a value in tenths of dB
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m_squelchLevel = std::pow(10.0, m_config.m_squelch / 100.0);
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//m_squelchLevel *= m_squelchLevel;
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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_demodGain = m_config.m_demodGain;
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m_running.m_fmDeviation = m_config.m_fmDeviation;
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m_running.m_squelchGate = m_config.m_squelchGate;
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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_audioMute = m_config.m_audioMute;
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}
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