mirror of
https://github.com/f4exb/sdrangel.git
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381 lines
13 KiB
C++
381 lines
13 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2017 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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// //
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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 "device/devicesourceapi.h"
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#include "audio/audiooutput.h"
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#include "dsp/threadedbasebandsamplesink.h"
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#include "dsp/downchannelizer.h"
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#include "chanalyzer.h"
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MESSAGE_CLASS_DEFINITION(ChannelAnalyzer::MsgConfigureChannelAnalyzer, Message)
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MESSAGE_CLASS_DEFINITION(ChannelAnalyzer::MsgConfigureChannelizer, Message)
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MESSAGE_CLASS_DEFINITION(ChannelAnalyzer::MsgReportChannelSampleRateChanged, Message)
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const QString ChannelAnalyzer::m_channelIdURI = "sdrangel.channel.chanalyzer";
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const QString ChannelAnalyzer::m_channelId = "ChannelAnalyzer";
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ChannelAnalyzer::ChannelAnalyzer(DeviceSourceAPI *deviceAPI) :
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ChannelSinkAPI(m_channelIdURI),
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m_deviceAPI(deviceAPI),
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m_sampleSink(0),
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m_settingsMutex(QMutex::Recursive)
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{
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setObjectName(m_channelId);
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m_undersampleCount = 0;
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m_sum = 0;
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m_usb = true;
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m_magsq = 0;
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m_useInterpolator = false;
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m_interpolatorDistance = 1.0f;
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m_interpolatorDistanceRemain = 0.0f;
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m_inputSampleRate = 48000;
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m_inputFrequencyOffset = 0;
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SSBFilter = new fftfilt(m_settings.m_lowCutoff / m_inputSampleRate, m_settings.m_bandwidth / m_inputSampleRate, ssbFftLen);
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DSBFilter = new fftfilt(m_settings.m_bandwidth / m_inputSampleRate, 2*ssbFftLen);
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RRCFilter = new fftfilt(m_settings.m_bandwidth / m_inputSampleRate, 2*ssbFftLen);
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m_corr = new fftcorr(8*ssbFftLen); // 8k for 4k effective samples
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m_pll.computeCoefficients(0.002f, 0.5f, 10.0f); // bandwidth, damping factor, loop gain
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applyChannelSettings(m_inputSampleRate, m_inputFrequencyOffset, true);
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applySettings(m_settings, true);
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m_channelizer = new DownChannelizer(this);
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m_threadedChannelizer = new ThreadedBasebandSampleSink(m_channelizer, this);
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m_deviceAPI->addThreadedSink(m_threadedChannelizer);
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m_deviceAPI->addChannelAPI(this);
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}
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ChannelAnalyzer::~ChannelAnalyzer()
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{
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m_deviceAPI->removeChannelAPI(this);
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m_deviceAPI->removeThreadedSink(m_threadedChannelizer);
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delete m_threadedChannelizer;
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delete m_channelizer;
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delete SSBFilter;
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delete DSBFilter;
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delete RRCFilter;
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}
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void ChannelAnalyzer::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool positiveOnly)
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{
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(void) positiveOnly;
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fftfilt::cmplx *sideband = 0;
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Complex ci;
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m_settingsMutex.lock();
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for(SampleVector::const_iterator it = begin; it < end; ++it)
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{
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Complex c(it->real(), it->imag());
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c *= m_nco.nextIQ();
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if (m_useInterpolator)
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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, sideband);
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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else
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{
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processOneSample(c, sideband);
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}
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}
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if(m_sampleSink != 0)
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{
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m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), m_settings.m_ssb); // m_ssb = positive only
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}
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m_sampleBuffer.clear();
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m_settingsMutex.unlock();
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}
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void ChannelAnalyzer::processOneSample(Complex& c, fftfilt::cmplx *sideband)
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{
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int n_out;
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int decim = 1<<m_settings.m_spanLog2;
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if (m_settings.m_ssb)
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{
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n_out = SSBFilter->runSSB(c, &sideband, m_usb);
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}
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else
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{
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if (m_settings.m_rrc) {
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n_out = RRCFilter->runFilt(c, &sideband);
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} else {
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n_out = DSBFilter->runDSB(c, &sideband);
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}
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}
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for (int i = 0; i < n_out; i++)
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{
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// Downsample by 2^(m_scaleLog2 - 1) for SSB band spectrum display
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// smart decimation with bit gain using float arithmetic (23 bits significand)
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m_sum += sideband[i];
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if (!(m_undersampleCount++ & (decim - 1))) // counter LSB bit mask for decimation by 2^(m_scaleLog2 - 1)
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{
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m_sum /= decim;
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Real re = m_sum.real() / SDR_RX_SCALEF;
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Real im = m_sum.imag() / SDR_RX_SCALEF;
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m_magsq = re*re + im*im;
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m_channelPowerAvg(m_magsq);
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std::complex<float> mix;
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if (m_settings.m_pll)
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{
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if (m_settings.m_fll)
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{
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m_fll.feed(re, im);
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// Use -fPLL to mix (exchange PLL real and image in the complex multiplication)
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mix = m_sum * std::conj(m_fll.getComplex());
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}
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else
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{
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m_pll.feed(re, im);
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// Use -fPLL to mix (exchange PLL real and image in the complex multiplication)
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mix = m_sum * std::conj(m_pll.getComplex());
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}
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}
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feedOneSample(m_settings.m_pll ? mix : m_sum, m_settings.m_fll ? m_fll.getComplex() : m_pll.getComplex());
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m_sum = 0;
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}
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}
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}
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void ChannelAnalyzer::start()
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{
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applyChannelSettings(m_inputSampleRate, m_inputFrequencyOffset, true);
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}
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void ChannelAnalyzer::stop()
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{
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}
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bool ChannelAnalyzer::handleMessage(const Message& cmd)
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{
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if (DownChannelizer::MsgChannelizerNotification::match(cmd))
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{
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DownChannelizer::MsgChannelizerNotification& notif = (DownChannelizer::MsgChannelizerNotification&) cmd;
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qDebug() << "ChannelAnalyzer::handleMessage: DownChannelizer::MsgChannelizerNotification:"
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<< " sampleRate: " << notif.getSampleRate()
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<< " frequencyOffset: " << notif.getFrequencyOffset();
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applyChannelSettings(notif.getSampleRate(), notif.getFrequencyOffset());
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if (getMessageQueueToGUI())
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{
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MsgReportChannelSampleRateChanged *msg = MsgReportChannelSampleRateChanged::create();
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getMessageQueueToGUI()->push(msg);
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}
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return true;
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}
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else if (MsgConfigureChannelizer::match(cmd))
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{
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MsgConfigureChannelizer& cfg = (MsgConfigureChannelizer&) cmd;
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qDebug() << "ChannelAnalyzer::handleMessage: MsgConfigureChannelizer:"
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<< " sampleRate: " << cfg.getSampleRate()
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<< " centerFrequency: " << cfg.getCenterFrequency();
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m_channelizer->configure(m_channelizer->getInputMessageQueue(),
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cfg.getSampleRate(),
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cfg.getCenterFrequency());
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return true;
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}
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else if (MsgConfigureChannelAnalyzer::match(cmd))
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{
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qDebug("ChannelAnalyzer::handleMessage: MsgConfigureChannelAnalyzer");
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MsgConfigureChannelAnalyzer& cfg = (MsgConfigureChannelAnalyzer&) cmd;
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applySettings(cfg.getSettings(), cfg.getForce());
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return true;
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}
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else
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{
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// Processed through GUI
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// if (m_sampleSink != 0)
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// {
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// return m_sampleSink->handleMessage(cmd);
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// }
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// else
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// {
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// return false;
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// }
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return false;
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}
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}
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void ChannelAnalyzer::applyChannelSettings(int inputSampleRate, int inputFrequencyOffset, bool force)
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{
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qDebug() << "ChannelAnalyzer::applyChannelSettings:"
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<< " inputSampleRate: " << inputSampleRate
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<< " inputFrequencyOffset: " << inputFrequencyOffset;
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if ((m_inputFrequencyOffset != inputFrequencyOffset) ||
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(m_inputSampleRate != inputSampleRate) || force)
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{
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m_nco.setFreq(-inputFrequencyOffset, inputSampleRate);
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}
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if ((m_inputSampleRate != inputSampleRate) || force)
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{
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m_settingsMutex.lock();
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m_interpolator.create(16, inputSampleRate, inputSampleRate / 2.2f);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) inputSampleRate / (Real) m_settings.m_downSampleRate;
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if (!m_settings.m_downSample)
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{
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setFilters(inputSampleRate, m_settings.m_bandwidth, m_settings.m_lowCutoff);
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m_pll.setSampleRate(inputSampleRate / (1<<m_settings.m_spanLog2));
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m_fll.setSampleRate(inputSampleRate / (1<<m_settings.m_spanLog2));
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}
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m_settingsMutex.unlock();
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}
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m_inputSampleRate = inputSampleRate;
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m_inputFrequencyOffset = inputFrequencyOffset;
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}
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void ChannelAnalyzer::setFilters(int sampleRate, float bandwidth, float lowCutoff)
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{
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qDebug("ChannelAnalyzer::setFilters: sampleRate: %d bandwidth: %f lowCutoff: %f",
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sampleRate, bandwidth, lowCutoff);
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if (bandwidth < 0)
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{
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bandwidth = -bandwidth;
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lowCutoff = -lowCutoff;
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m_usb = false;
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}
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else
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{
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m_usb = true;
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}
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if (bandwidth < 100.0f)
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{
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bandwidth = 100.0f;
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lowCutoff = 0;
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}
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SSBFilter->create_filter(lowCutoff / sampleRate, bandwidth / sampleRate);
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DSBFilter->create_dsb_filter(bandwidth / sampleRate);
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RRCFilter->create_rrc_filter(bandwidth / sampleRate, m_settings.m_rrcRolloff / 100.0);
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}
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void ChannelAnalyzer::applySettings(const ChannelAnalyzerSettings& settings, bool force)
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{
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qDebug() << "ChannelAnalyzer::applySettings:"
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<< " m_downSample: " << settings.m_downSample
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<< " m_downSampleRate: " << settings.m_downSampleRate
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<< " m_rcc: " << settings.m_rrc
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<< " m_rrcRolloff: " << settings.m_rrcRolloff / 100.0
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<< " m_bandwidth: " << settings.m_bandwidth
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<< " m_lowCutoff: " << settings.m_lowCutoff
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<< " m_spanLog2: " << settings.m_spanLog2
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<< " m_ssb: " << settings.m_ssb
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<< " m_pll: " << settings.m_pll
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<< " m_fll: " << settings.m_fll
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<< " m_pllPskOrder: " << settings.m_pllPskOrder
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<< " m_inputType: " << (int) settings.m_inputType;
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if ((settings.m_downSampleRate != m_settings.m_downSampleRate) || force)
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{
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m_settingsMutex.lock();
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m_interpolator.create(16, m_inputSampleRate, m_inputSampleRate / 2.2);
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m_interpolatorDistanceRemain = 0.0f;
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m_interpolatorDistance = (Real) m_inputSampleRate / (Real) settings.m_downSampleRate;
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m_settingsMutex.unlock();
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}
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if ((settings.m_downSample != m_settings.m_downSample) || force)
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{
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int sampleRate = settings.m_downSample ? settings.m_downSampleRate : m_inputSampleRate;
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m_settingsMutex.lock();
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m_useInterpolator = settings.m_downSample;
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setFilters(sampleRate, settings.m_bandwidth, settings.m_lowCutoff);
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m_pll.setSampleRate(sampleRate / (1<<settings.m_spanLog2));
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m_fll.setSampleRate(sampleRate / (1<<settings.m_spanLog2));
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m_settingsMutex.unlock();
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}
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if ((settings.m_bandwidth != m_settings.m_bandwidth) ||
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(settings.m_lowCutoff != m_settings.m_lowCutoff)|| force)
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{
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m_settingsMutex.lock();
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setFilters(settings.m_downSample ? settings.m_downSampleRate : m_inputSampleRate, settings.m_bandwidth, settings.m_lowCutoff);
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m_settingsMutex.unlock();
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}
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if ((settings.m_rrcRolloff != m_settings.m_rrcRolloff) || force)
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{
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float sampleRate = settings.m_downSample ? (float) settings.m_downSampleRate : (float) m_inputSampleRate;
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m_settingsMutex.lock();
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RRCFilter->create_rrc_filter(settings.m_bandwidth / sampleRate, settings.m_rrcRolloff / 100.0);
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m_settingsMutex.unlock();
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}
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if ((settings.m_spanLog2 != m_settings.m_spanLog2) || force)
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{
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int sampleRate = (settings.m_downSample ? settings.m_downSampleRate : m_inputSampleRate) / (1<<m_settings.m_spanLog2);
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m_pll.setSampleRate(sampleRate);
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m_fll.setSampleRate(sampleRate);
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}
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if (settings.m_pll != m_settings.m_pll || force)
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{
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if (settings.m_pll)
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{
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m_pll.reset();
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m_fll.reset();
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}
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}
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if (settings.m_fll != m_settings.m_fll || force)
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{
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if (settings.m_fll) {
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m_fll.reset();
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}
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}
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if (settings.m_pllPskOrder != m_settings.m_pllPskOrder || force)
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{
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if (settings.m_pllPskOrder < 32) {
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m_pll.setPskOrder(settings.m_pllPskOrder);
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}
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}
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m_settings = settings;
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}
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