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371 lines
13 KiB
C++
371 lines
13 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2022-2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// Copyright (C) 2023 Jon Beniston, M7RCE <jon@beniston.com> //
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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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// (at your option) any later version. //
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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 <string.h>
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#include <stdio.h>
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#include <complex.h>
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#include <QTime>
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#include <QDebug>
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#include <QNetworkAccessManager>
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#include <QNetworkReply>
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#include <QBuffer>
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#include "dsp/basebandsamplesink.h"
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#include "dsp/datafifo.h"
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#include "util/messagequeue.h"
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#include "maincore.h"
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#include "m17demodsink.h"
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M17DemodSink::M17DemodSink() :
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m_channelSampleRate(48000),
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m_channelFrequencyOffset(0),
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m_audioSampleRate(48000),
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m_interpolatorDistance(0.0f),
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m_interpolatorDistanceRemain(0.0f),
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m_sampleCount(0),
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m_squelchCount(0),
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m_squelchGate(0),
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m_squelchLevel(1e-4),
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m_squelchOpen(false),
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m_squelchWasOpen(false),
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m_squelchDelayLine(24000),
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m_audioFifo(48000),
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m_scopeXY(nullptr),
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m_scopeEnabled(true)
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{
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m_audioBuffer.resize(1<<14);
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m_demodBuffer.resize(1<<12);
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m_demodBufferFill = 0;
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m_m17DemodProcessor.setAudioFifo(&m_audioFifo);
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m_sampleBuffer = new FixReal[1<<17]; // 128 kS
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m_sampleBufferIndex = 0;
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m_scaleFromShort = SDR_RX_SAMP_SZ < sizeof(short)*8 ? 1 : 1<<(SDR_RX_SAMP_SZ - sizeof(short)*8);
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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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applySettings(m_settings, QList<QString>(), true);
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applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
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}
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M17DemodSink::~M17DemodSink()
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{
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delete[] m_sampleBuffer;
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}
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void M17DemodSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
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{
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Complex ci;
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int samplesPerSymbol = 10;
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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.decimate(&m_interpolatorDistanceRemain, c, &ci))
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{
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FixReal sample, delayedSample;
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qint16 sampleM17;
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Real re = ci.real() / SDR_RX_SCALED;
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Real im = ci.imag() / SDR_RX_SCALED;
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Real magsq = re*re + im*im;
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m_movingAverage(magsq);
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m_magsqSum += magsq;
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if (magsq > m_magsqPeak) {
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m_magsqPeak = magsq;
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}
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m_magsqCount++;
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Real demod = m_phaseDiscri.phaseDiscriminator(ci);
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m_sampleCount++;
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// AF processing
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if (m_movingAverage.asDouble() > m_squelchLevel)
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{
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if (m_squelchGate > 0)
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{
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if (m_squelchCount < m_squelchGate*2) {
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m_squelchCount++;
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}
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m_squelchDelayLine.write(demod);
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m_squelchOpen = m_squelchCount > m_squelchGate;
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}
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else
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{
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m_squelchOpen = true;
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}
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}
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else
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{
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if (m_squelchGate > 0)
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{
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if (m_squelchCount > 0) {
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m_squelchCount--;
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}
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m_squelchDelayLine.write(0);
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m_squelchOpen = m_squelchCount > m_squelchGate;
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}
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else
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{
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m_squelchOpen = false;
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}
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}
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if (m_squelchOpen)
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{
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if (m_squelchGate > 0)
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{
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sampleM17 = m_squelchDelayLine.readBack(m_squelchGate) * 32768.0f; // M17 decoder takes int16 samples
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m_m17DemodProcessor.pushSample(sampleM17);
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sample = m_squelchDelayLine.readBack(m_squelchGate) * SDR_RX_SCALEF; // scale to sample size
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}
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else
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{
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sampleM17 = demod * 32768.0f; // M17 decoder takes int16 samples
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m_m17DemodProcessor.pushSample(sampleM17);
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sample = demod * SDR_RX_SCALEF; // scale to sample size
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}
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}
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else
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{
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sampleM17 = 0;
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sample = 0;
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if (m_squelchWasOpen)
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{
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if (m_m17DemodProcessor.getStreamElsePacket()) { // if packet kepp last values
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m_m17DemodProcessor.resetInfo();
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}
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m_m17DemodProcessor.setDCDOff(); // indicate loss of carrier
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}
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}
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m_squelchWasOpen = m_squelchOpen;
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m_demodBuffer[m_demodBufferFill] = sampleM17;
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++m_demodBufferFill;
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if (m_demodBufferFill >= m_demodBuffer.size())
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{
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QList<ObjectPipe*> dataPipes;
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MainCore::instance()->getDataPipes().getDataPipes(m_channel, "demod", dataPipes);
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if (dataPipes.size() > 0)
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{
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QList<ObjectPipe*>::iterator it = dataPipes.begin();
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for (; it != dataPipes.end(); ++it)
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{
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DataFifo *fifo = qobject_cast<DataFifo*>((*it)->m_element);
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if (fifo) {
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fifo->write((quint8*) &m_demodBuffer[0], m_demodBuffer.size() * sizeof(qint16), DataFifo::DataTypeI16);
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}
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}
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}
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m_demodBufferFill = 0;
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}
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// if (m_settings.m_enableCosineFiltering) { // show actual input to FSK demod
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// sample = m_dsdDecoder.getFilteredSample() * m_scaleFromShort;
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// }
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if (m_sampleBufferIndex < (1<<17)-1) {
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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 < samplesPerSymbol) {
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delayedSample = m_sampleBuffer[(1<<17) - samplesPerSymbol + m_sampleBufferIndex]; // wrap
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} else {
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delayedSample = m_sampleBuffer[m_sampleBufferIndex - samplesPerSymbol];
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}
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// if (m_settings.m_syncOrConstellation)
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// {
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// Sample s(sample, m_dsdDecoder.getSymbolSyncSample() * m_scaleFromShort * 0.84);
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// m_scopeSampleBuffer.push_back(s);
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// }
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// else
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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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// }
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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if ((m_scopeXY != nullptr) && (m_scopeEnabled))
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{
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m_scopeXY->feed(m_scopeSampleBuffer.begin(), m_scopeSampleBuffer.end(), true); // true = real samples for what it's worth
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}
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}
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void M17DemodSink::applyAudioSampleRate(int sampleRate)
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{
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if (sampleRate < 0)
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{
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qWarning("M17DemodSink::applyAudioSampleRate: invalid sample rate: %d", sampleRate);
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return;
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}
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int upsampling = sampleRate / 8000;
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qDebug("M17DemodSink::applyAudioSampleRate: audio rate: %d upsample by %d", sampleRate, upsampling);
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if (sampleRate % 8000 != 0) {
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qDebug("M17DemodSink::applyAudioSampleRate: audio will sound best with sample rates that are integer multiples of 8 kS/s");
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}
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m_m17DemodProcessor.setUpsampling(upsampling);
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m_audioSampleRate = sampleRate;
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QList<ObjectPipe*> pipes;
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MainCore::instance()->getMessagePipes().getMessagePipes(m_channel, "reportdemod", pipes);
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if (pipes.size() > 0)
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{
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for (const auto& pipe : pipes)
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{
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MessageQueue *messageQueue = qobject_cast<MessageQueue*>(pipe->m_element);
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MainCore::MsgChannelDemodReport *msg = MainCore::MsgChannelDemodReport::create(m_channel, sampleRate);
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messageQueue->push(msg);
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}
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}
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}
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void M17DemodSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
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{
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qDebug() << "DSDDemodSink::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " inputFrequencyOffset: " << channelFrequencyOffset;
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if ((channelFrequencyOffset != m_channelFrequencyOffset) ||
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(channelSampleRate != m_channelSampleRate) || force)
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{
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m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
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}
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if ((channelSampleRate != m_channelSampleRate) || force)
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{
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m_interpolator.create(16, channelSampleRate, (m_settings.m_rfBandwidth) / 2.2);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) channelSampleRate / (Real) 48000;
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}
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m_channelSampleRate = channelSampleRate;
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m_channelFrequencyOffset = channelFrequencyOffset;
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}
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void M17DemodSink::applySettings(const M17DemodSettings& settings, const QList<QString>& settingsKeys, bool force)
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{
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qDebug() << "M17DemodSink::applySettings: "
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<< " settingsKeys: " << settingsKeys
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<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
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<< " m_rfBandwidth: " << settings.m_rfBandwidth
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<< " m_fmDeviation: " << settings.m_fmDeviation
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<< " m_volume: " << settings.m_volume
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<< " m_baudRate: " << settings.m_baudRate
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<< " m_squelchGate" << settings.m_squelchGate
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<< " m_squelch: " << settings.m_squelch
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<< " m_audioMute: " << settings.m_audioMute
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<< " m_syncOrConstellation: " << settings.m_syncOrConstellation
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<< " m_highPassFilter: "<< settings.m_highPassFilter
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<< " m_audioDeviceName: " << settings.m_audioDeviceName
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<< " m_traceLengthMutliplier: " << settings.m_traceLengthMutliplier
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<< " m_traceStroke: " << settings.m_traceStroke
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<< " m_traceDecay: " << settings.m_traceDecay
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<< " m_streamIndex: " << settings.m_streamIndex
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<< " force: " << force;
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if (settingsKeys.contains("rfBandwidth") || force)
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{
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m_interpolator.create(16, m_channelSampleRate, (settings.m_rfBandwidth) / 2.2);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) m_channelSampleRate / (Real) 48000;
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//m_phaseDiscri.setFMScaling((float) settings.m_rfBandwidth / (float) settings.m_fmDeviation);
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}
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if (settingsKeys.contains("fmDeviation") || force) {
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m_phaseDiscri.setFMScaling(48000.0f / (2.0f*M_PI*settings.m_fmDeviation));
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}
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if (settingsKeys.contains("squelchGate") || force)
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{
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m_squelchGate = 480 * settings.m_squelchGate; // gate is given in 10s of ms at 48000 Hz audio sample rate
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m_squelchCount = 0; // reset squelch open counter
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}
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if (settingsKeys.contains("squelch") || force) {
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m_squelchLevel = std::pow(10.0, settings.m_squelch / 10.0); // input is a value in dB
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}
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if (settingsKeys.contains("audioMute") || force) {
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m_m17DemodProcessor.setAudioMute(settings.m_audioMute);
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}
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if (settingsKeys.contains("volume") || force) {
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m_m17DemodProcessor.setVolume(settings.m_volume);
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}
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if (settingsKeys.contains("baudRate") || force)
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{
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// m_dsdDecoder.setBaudRate(settings.m_baudRate); (future)
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}
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if (settingsKeys.contains("highPassFilter") || force) {
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m_m17DemodProcessor.setHP(settings.m_highPassFilter);
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}
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if (force) {
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m_settings = settings;
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} else {
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m_settings.applySettings(settingsKeys, settings);
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}
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}
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void M17DemodSink::configureMyPosition(float myLatitude, float myLongitude)
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{
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m_latitude = myLatitude;
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m_longitude = myLongitude;
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}
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