mirror of
https://github.com/f4exb/sdrangel.git
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207 lines
5.6 KiB
C++
207 lines
5.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015 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 "../../channelrx/chanalyzer/chanalyzer.h"
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#include <dsp/downchannelizer.h>
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#include <QTime>
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#include <QDebug>
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#include <stdio.h>
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#include "audio/audiooutput.h"
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MESSAGE_CLASS_DEFINITION(ChannelAnalyzer::MsgConfigureChannelAnalyzer, Message)
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ChannelAnalyzer::ChannelAnalyzer(BasebandSampleSink* sampleSink) :
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m_sampleSink(sampleSink),
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m_settingsMutex(QMutex::Recursive)
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{
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m_Bandwidth = 5000;
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m_LowCutoff = 300;
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m_spanLog2 = 3;
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m_sampleRate = 96000;
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m_frequency = 0;
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m_nco.setFreq(m_frequency, m_sampleRate);
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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_ssb = true;
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m_magsq = 0;
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SSBFilter = new fftfilt(m_LowCutoff / m_sampleRate, m_Bandwidth / m_sampleRate, ssbFftLen);
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DSBFilter = new fftfilt(m_Bandwidth / m_sampleRate, 2*ssbFftLen);
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}
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ChannelAnalyzer::~ChannelAnalyzer()
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{
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if (SSBFilter) delete SSBFilter;
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if (DSBFilter) delete DSBFilter;
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}
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void ChannelAnalyzer::configure(MessageQueue* messageQueue,
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Real Bandwidth,
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Real LowCutoff,
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int spanLog2,
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bool ssb)
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{
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Message* cmd = MsgConfigureChannelAnalyzer::create(Bandwidth, LowCutoff, spanLog2, ssb);
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messageQueue->push(cmd);
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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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fftfilt::cmplx *sideband;
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int n_out;
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int decim = 1<<m_spanLog2;
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unsigned char decim_mask = decim - 1; // counter LSB bit mask for decimation by 2^(m_scaleLog2 - 1)
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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() / 32768.0f, it->imag() / 32768.0f);
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Complex c(it->real(), it->imag());
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c *= m_nco.nextIQ();
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if (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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n_out = DSBFilter->runDSB(c, &sideband);
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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_mask))
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{
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m_sum /= decim;
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m_magsq = (m_sum.real() * m_sum.real() + m_sum.imag() * m_sum.imag())/ (1<<30);
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if (m_ssb & !m_usb)
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{ // invert spectrum for LSB
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//m_sampleBuffer.push_back(Sample(m_sum.imag() * 32768.0, m_sum.real() * 32768.0));
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m_sampleBuffer.push_back(Sample(m_sum.imag(), m_sum.real()));
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}
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else
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{
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//m_sampleBuffer.push_back(Sample(m_sum.real() * 32768.0, m_sum.imag() * 32768.0));
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m_sampleBuffer.push_back(Sample(m_sum.real(), m_sum.imag()));
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}
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m_sum = 0;
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}
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}
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}
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if(m_sampleSink != NULL)
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{
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m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), 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::start()
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{
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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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float band, lowCutoff;
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qDebug() << "ChannelAnalyzer::handleMessage";
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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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m_sampleRate = notif.getSampleRate();
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m_nco.setFreq(-notif.getFrequencyOffset(), m_sampleRate);
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qDebug() << "ChannelAnalyzer::handleMessage: MsgChannelizerNotification: m_sampleRate: " << m_sampleRate
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<< " frequencyOffset: " << notif.getFrequencyOffset();
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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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MsgConfigureChannelAnalyzer& cfg = (MsgConfigureChannelAnalyzer&) cmd;
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band = cfg.getBandwidth();
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lowCutoff = cfg.getLoCutoff();
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if (band < 0)
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{
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band = -band;
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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 (band < 100.0f)
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{
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band = 100.0f;
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lowCutoff = 0;
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}
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m_settingsMutex.lock();
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m_Bandwidth = band;
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m_LowCutoff = lowCutoff;
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SSBFilter->create_filter(m_LowCutoff / m_sampleRate, m_Bandwidth / m_sampleRate);
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DSBFilter->create_dsb_filter(m_Bandwidth / m_sampleRate);
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m_spanLog2 = cfg.getSpanLog2();
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m_ssb = cfg.getSSB();
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m_settingsMutex.unlock();
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qDebug() << " - MsgConfigureChannelAnalyzer: m_Bandwidth: " << m_Bandwidth
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<< " m_LowCutoff: " << m_LowCutoff
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<< " m_spanLog2: " << m_spanLog2
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<< " m_ssb: " << m_ssb;
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return true;
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}
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else
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{
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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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}
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}
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