kopia lustrzana https://github.com/f4exb/sdrangel
234 wiersze
8.6 KiB
C++
234 wiersze
8.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 Edouard Griffiths, F4EXB //
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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 <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 "audio/audiooutput.h"
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#include "dsp/dspengine.h"
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#include "dsp/dspcommands.h"
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#include "dsp/devicesamplemimo.h"
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#include "util/db.h"
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#include "wfmdemodsink.h"
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const unsigned int WFMDemodSink::m_rfFilterFftLength = 1024;
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WFMDemodSink::WFMDemodSink() :
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m_channelSampleRate(384000),
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m_audioSampleRate(48000),
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m_channelFrequencyOffset(0),
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m_squelchOpen(false),
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m_magsq(0.0f),
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m_magsqSum(0.0f),
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m_magsqPeak(0.0f),
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m_magsqCount(0),
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m_audioFifo(250000)
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{
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m_rfFilter = new fftfilt(-50000.0 / 384000.0, 50000.0 / 384000.0, m_rfFilterFftLength);
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m_phaseDiscri.setFMScaling(384000/75000);
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m_audioBuffer.resize(16384);
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m_audioBufferFill = 0;
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applySettings(m_settings, true);
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applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
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}
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WFMDemodSink::~WFMDemodSink()
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{
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delete m_rfFilter;
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}
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void WFMDemodSink::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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fftfilt::cmplx *rf;
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int rf_out;
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Real demod;
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double msq;
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float fmDev;
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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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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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Real magsq = msq / (SDR_RX_SCALED*SDR_RX_SCALED);
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m_magsqSum += magsq;
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m_movingAverage(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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if (magsq >= m_squelchLevel)
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{
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if (m_squelchState < m_settings.m_rfBandwidth / 10) { // twice attack and decay rate
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m_squelchState++;
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}
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}
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else
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{
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if (m_squelchState > 0) {
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m_squelchState--;
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}
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}
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m_squelchOpen = (m_squelchState > (m_settings.m_rfBandwidth / 20));
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if (m_squelchOpen && !m_settings.m_audioMute) { // squelch open and not mute
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demod = m_phaseDiscri.phaseDiscriminatorDelta(rf[i], msq, fmDev);
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} else {
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demod = 0;
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}
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Complex e(demod, 0);
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if (m_interpolator.decimate(&m_interpolatorDistanceRemain, e, &ci))
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{
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qint16 sample = (qint16)(ci.real() * 3276.8f * m_settings.m_volume);
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m_sampleBuffer.push_back(Sample(sample, sample));
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m_audioBuffer[m_audioBufferFill].l = sample;
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m_audioBuffer[m_audioBufferFill].r = sample;
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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);
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if (res != m_audioBufferFill) {
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qDebug("WFMDemodSink::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);
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if (res != m_audioBufferFill) {
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qDebug("WFMDemodSink::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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m_sampleBuffer.clear();
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}
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void WFMDemodSink::applyAudioSampleRate(unsigned int sampleRate)
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{
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qDebug("WFMDemodSink::applyAudioSampleRate: %u", sampleRate);
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m_interpolator.create(16, m_channelSampleRate, m_settings.m_afBandwidth);
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m_interpolatorDistanceRemain = (Real) m_channelSampleRate / sampleRate;
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m_interpolatorDistance = (Real) m_channelSampleRate / (Real) sampleRate;
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m_audioSampleRate = sampleRate;
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}
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void WFMDemodSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
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{
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qDebug() << "WFMDemodSink::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " channelFrequencyOffset: " << 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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qDebug() << "WFMDemod::applyChannelSettings: m_interpolator.create";
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m_interpolator.create(16, channelSampleRate, m_settings.m_afBandwidth);
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m_interpolatorDistanceRemain = (Real) channelSampleRate / (Real) m_audioSampleRate;
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m_interpolatorDistance = (Real) channelSampleRate / (Real) m_audioSampleRate;
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qDebug() << "WFMDemod::applySettings: m_rfFilter->create_filter";
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Real lowCut = -(m_settings.m_rfBandwidth / 2.0) / channelSampleRate;
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Real hiCut = (m_settings.m_rfBandwidth / 2.0) / channelSampleRate;
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m_rfFilter->create_filter(lowCut, hiCut);
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m_fmExcursion = m_settings.m_rfBandwidth / (Real) channelSampleRate;
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m_phaseDiscri.setFMScaling(1.0f/m_fmExcursion);
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qDebug("WFMDemod::applySettings: m_fmExcursion: %f", m_fmExcursion);
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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 WFMDemodSink::applySettings(const WFMDemodSettings& settings, bool force)
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{
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qDebug() << "WFMDemodSink::applySettings:"
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<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
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<< " m_rfBandwidth: " << settings.m_rfBandwidth
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<< " m_afBandwidth: " << settings.m_afBandwidth
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<< " m_volume: " << settings.m_volume
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<< " m_squelch: " << settings.m_squelch
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<< " m_audioDeviceName: " << settings.m_audioDeviceName
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<< " m_audioMute: " << settings.m_audioMute
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<< " m_streamIndex: " << settings.m_streamIndex
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<< " m_useReverseAPI: " << settings.m_useReverseAPI
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<< " m_reverseAPIAddress: " << settings.m_reverseAPIAddress
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<< " m_reverseAPIPort: " << settings.m_reverseAPIPort
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<< " m_reverseAPIDeviceIndex: " << settings.m_reverseAPIDeviceIndex
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<< " m_reverseAPIChannelIndex: " << settings.m_reverseAPIChannelIndex
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<< " force: " << force;
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if((settings.m_afBandwidth != m_settings.m_afBandwidth) ||
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(settings.m_rfBandwidth != m_settings.m_rfBandwidth) || force)
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{
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qDebug() << "WFMDemodSink::applySettings: m_interpolator.create";
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m_interpolator.create(16, m_channelSampleRate, settings.m_afBandwidth);
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m_interpolatorDistanceRemain = (Real) m_channelSampleRate / (Real) m_audioSampleRate;
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m_interpolatorDistance = (Real) m_channelSampleRate / (Real) m_audioSampleRate;
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qDebug() << "WFMDemodSink::applySettings: m_rfFilter->create_filter";
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Real lowCut = -(settings.m_rfBandwidth / 2.0) / m_channelSampleRate;
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Real hiCut = (settings.m_rfBandwidth / 2.0) / m_channelSampleRate;
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m_rfFilter->create_filter(lowCut, hiCut);
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m_fmExcursion = settings.m_rfBandwidth / (Real) m_channelSampleRate;
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m_phaseDiscri.setFMScaling(1.0f/m_fmExcursion);
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qDebug("WFMDemodSink::applySettings: m_fmExcursion: %f", m_fmExcursion);
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}
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if ((settings.m_squelch != m_settings.m_squelch) || force)
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{
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qDebug() << "WFMDemodSink::applySettings: set m_squelchLevel";
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m_squelchLevel = pow(10.0, settings.m_squelch / 10.0);
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}
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m_settings = settings;
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}
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