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365 lines
13 KiB
C++
365 lines
13 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2021-2024 Jon Beniston, M7RCE <jon@beniston.com> //
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// Copyright (C) 2021-2022 Edouard Griffiths, F4EXB <f4exb06@gmail.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 <QDebug>
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#include "dsp/datafifo.h"
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#include "device/deviceapi.h"
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#include "channel/channelwebapiutils.h"
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#include "maincore.h"
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#include "endoftraindemod.h"
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#include "endoftraindemodsink.h"
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EndOfTrainDemodSink::EndOfTrainDemodSink(EndOfTrainDemod *endoftrainDemod) :
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m_scopeSink(nullptr),
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m_endoftrainDemod(endoftrainDemod),
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m_channelSampleRate(EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE),
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m_channelFrequencyOffset(0),
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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_messageQueueToChannel(nullptr),
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m_f1(nullptr),
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m_f0(nullptr),
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m_corrBuf(nullptr),
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m_corrIdx(0),
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m_corrCnt(0),
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m_sampleBufferIndex(0)
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{
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m_magsq = 0.0;
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m_demodBuffer.resize(1<<12);
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m_demodBufferFill = 0;
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for (int i = 0; i < EndOfTrainDemodSettings::m_scopeStreams; i++) {
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m_sampleBuffer[i].resize(m_sampleBufferSize);
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}
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applySettings(m_settings, QStringList(), true);
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applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
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}
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EndOfTrainDemodSink::~EndOfTrainDemodSink()
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{
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delete[] m_f1;
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delete[] m_f0;
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delete[] m_corrBuf;
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}
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void EndOfTrainDemodSink::sampleToScope(Complex sample, Real s1, Real s2, Real s3, Real s4, Real s5, Real s6, Real s7, Real s8)
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{
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if (m_scopeSink)
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{
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m_sampleBuffer[0][m_sampleBufferIndex] = sample;
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m_sampleBuffer[1][m_sampleBufferIndex] = Complex(s1, 0.0f);
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m_sampleBuffer[2][m_sampleBufferIndex] = Complex(s2, 0.0f);
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m_sampleBuffer[3][m_sampleBufferIndex] = Complex(s3, 0.0f);
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m_sampleBuffer[4][m_sampleBufferIndex] = Complex(s4, 0.0f);
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m_sampleBuffer[5][m_sampleBufferIndex] = Complex(s5, 0.0f);
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m_sampleBuffer[6][m_sampleBufferIndex] = Complex(s6, 0.0f);
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m_sampleBuffer[7][m_sampleBufferIndex] = Complex(s7, 0.0f);
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m_sampleBuffer[8][m_sampleBufferIndex] = Complex(s8, 0.0f);
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m_sampleBufferIndex++;
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if (m_sampleBufferIndex == m_sampleBufferSize)
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{
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std::vector<ComplexVector::const_iterator> vbegin;
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for (int i = 0; i < EndOfTrainDemodSettings::m_scopeStreams; i++) {
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vbegin.push_back(m_sampleBuffer[i].begin());
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}
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m_scopeSink->feed(vbegin, m_sampleBufferSize);
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m_sampleBufferIndex = 0;
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}
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}
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}
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void EndOfTrainDemodSink::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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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_interpolatorDistance < 1.0f) // interpolate
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{
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while (!m_interpolator.interpolate(&m_interpolatorDistanceRemain, c, &ci))
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{
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processOneSample(ci);
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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else // decimate
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{
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if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
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{
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processOneSample(ci);
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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}
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}
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void EndOfTrainDemodSink::processOneSample(Complex &ci)
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{
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Complex ca;
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// FM demodulation
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double magsqRaw;
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Real deviation;
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Real fmDemod = m_phaseDiscri.phaseDiscriminatorDelta(ci, magsqRaw, deviation);
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// Calculate average and peak levels for level meter
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Real magsq = magsqRaw / (SDR_RX_SCALED*SDR_RX_SCALED);
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m_movingAverage(magsq);
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m_magsq = m_movingAverage.asDouble();
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m_magsqSum += magsq;
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if (magsq > m_magsqPeak)
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{
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m_magsqPeak = magsq;
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}
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m_magsqCount++;
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Real f0Filt = 0.0f;
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Real f1Filt = 0.0f;
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float diff = 0.0;
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int sample = 0;
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int bit = 0;
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m_corrBuf[m_corrIdx] = fmDemod;
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if (m_corrCnt >= m_correlationLength)
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{
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// Correlate with 1200 + 1800 baud complex exponentials
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Complex corrF0 = 0.0f;
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Complex corrF1 = 0.0f;
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for (int i = 0; i < m_correlationLength; i++)
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{
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int j = m_corrIdx - i;
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if (j < 0)
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j += m_correlationLength;
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corrF0 += m_f0[i] * m_corrBuf[j];
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corrF1 += m_f1[i] * m_corrBuf[j];
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}
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m_corrCnt--; // Avoid overflow in increment below
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// Low pass filter, to minimize changes above the baud rate
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f0Filt = m_lowpassF0.filter(std::abs(corrF0));
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f1Filt = m_lowpassF1.filter(std::abs(corrF1));
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// Determine which is the closest match and then quantise to 1 or -1
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diff = f1Filt - f0Filt;
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sample = diff >= 0.0f ? 1 : 0;
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// Look for edge
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if (sample != m_samplePrev)
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{
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m_syncCount = EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE/EndOfTrainDemodSettings::BAUD_RATE/2;
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}
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else
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{
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m_syncCount--;
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if (m_syncCount <= 0)
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{
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bit = sample;
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// Store in shift reg - LSB first
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m_bits |= bit << m_bitCount;
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m_bitCount++;
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if (!m_gotSOP)
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{
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if (m_bitCount >= 17)
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{
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// Look for frame sync
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if ((m_bits & 0x1ffff) == 0x91D5)
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{
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// Start of packet
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m_gotSOP = true;
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m_bits = 0;
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m_bitCount = 0;
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m_byteCount = 0;
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}
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else
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{
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m_bitCount--;
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m_bits >>= 1;
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}
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}
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}
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else
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{
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if (m_bitCount == 8)
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{
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if (m_byteCount == 8)
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{
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QByteArray rxPacket((char *)m_bytes, m_byteCount);
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//qDebug() << "RX: " << rxPacket.toHex();
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if (getMessageQueueToChannel())
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{
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QDateTime dateTime = QDateTime::currentDateTime();
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if (m_settings.m_useFileTime)
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{
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QString hardwareId = m_endoftrainDemod->getDeviceAPI()->getHardwareId();
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if ((hardwareId == "FileInput") || (hardwareId == "SigMFFileInput"))
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{
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QString dateTimeStr;
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int deviceIdx = m_endoftrainDemod->getDeviceSetIndex();
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if (ChannelWebAPIUtils::getDeviceReportValue(deviceIdx, "absoluteTime", dateTimeStr)) {
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dateTime = QDateTime::fromString(dateTimeStr, Qt::ISODateWithMs);
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}
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}
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}
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MainCore::MsgPacket *msg = MainCore::MsgPacket::create(m_endoftrainDemod, rxPacket, dateTime);
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getMessageQueueToChannel()->push(msg);
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}
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// Reset state to start receiving next packet
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m_gotSOP = false;
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m_bits = 0;
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m_bitCount = 0;
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m_byteCount = 0;
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}
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else
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{
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m_bytes[m_byteCount] = m_bits;
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m_byteCount++;
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}
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m_bits = 0;
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m_bitCount = 0;
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}
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}
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m_syncCount = EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE/EndOfTrainDemodSettings::BAUD_RATE;
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}
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}
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m_samplePrev = sample;
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}
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m_corrIdx = (m_corrIdx + 1) % m_correlationLength;
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m_corrCnt++;
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// Select signals to feed to scope
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sampleToScope(ci / SDR_RX_SCALEF, magsq, fmDemod, f0Filt, f1Filt, diff, sample, bit, m_gotSOP);
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// Send demod signal to Demod Analyzer feature
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m_demodBuffer[m_demodBufferFill++] = fmDemod * std::numeric_limits<int16_t>::max();
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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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}
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void EndOfTrainDemodSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
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{
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qDebug() << "EndOfTrainDemodSink::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " channelFrequencyOffset: " << channelFrequencyOffset;
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if ((m_channelFrequencyOffset != channelFrequencyOffset) ||
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(m_channelSampleRate != channelSampleRate) || force)
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{
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m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
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}
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if ((m_channelSampleRate != 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_interpolatorDistance = (Real) channelSampleRate / (Real) EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE;
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m_interpolatorDistanceRemain = m_interpolatorDistance;
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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 EndOfTrainDemodSink::applySettings(const EndOfTrainDemodSettings& settings, const QStringList& settingsKeys, bool force)
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{
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qDebug() << "EndOfTrainDemodSink::applySettings:"
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<< settings.getDebugString(settingsKeys, force)
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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_interpolatorDistance = (Real) m_channelSampleRate / (Real) EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE;
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m_interpolatorDistanceRemain = m_interpolatorDistance;
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}
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if (settingsKeys.contains("fmDeviation") || force)
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{
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m_phaseDiscri.setFMScaling(EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE / (2.0f * settings.m_fmDeviation));
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}
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if (force)
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{
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delete[] m_f1;
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delete[] m_f0;
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delete[] m_corrBuf;
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m_correlationLength = EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE/EndOfTrainDemodSettings::BAUD_RATE;
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m_f1 = new Complex[m_correlationLength]();
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m_f0 = new Complex[m_correlationLength]();
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m_corrBuf = new Complex[m_correlationLength]();
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m_corrIdx = 0;
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m_corrCnt = 0;
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Real f0 = 0.0f;
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Real f1 = 0.0f;
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for (int i = 0; i < m_correlationLength; i++)
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{
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m_f0[i] = Complex(cos(f0), sin(f0));
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m_f1[i] = Complex(cos(f1), sin(f1));
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f0 += 2.0f*(Real)M_PI*1800.0f/EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE;
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f1 += 2.0f*(Real)M_PI*1200.0f/EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE;
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}
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m_lowpassF1.create(301, EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE, EndOfTrainDemodSettings::BAUD_RATE * 1.1f);
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m_lowpassF0.create(301, EndOfTrainDemodSettings::CHANNEL_SAMPLE_RATE, EndOfTrainDemodSettings::BAUD_RATE * 1.1f);
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m_samplePrev = 0;
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m_syncCount = 0;
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m_bits = 0;
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m_bitCount = 0;
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m_gotSOP = false;
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m_byteCount = 0;
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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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