mirror of
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268 lines
8.6 KiB
C++
268 lines
8.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016 F4EXB //
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// written by Edouard Griffiths //
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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 <dsp/downchannelizer.h>
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#include "dsp/inthalfbandfilter.h"
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#include "dsp/dspcommands.h"
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#include <QString>
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#include <QDebug>
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MESSAGE_CLASS_DEFINITION(DownChannelizer::MsgChannelizerNotification, Message)
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DownChannelizer::DownChannelizer(BasebandSampleSink* sampleSink) :
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m_sampleSink(sampleSink),
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m_inputSampleRate(0),
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m_requestedOutputSampleRate(0),
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m_requestedCenterFrequency(0),
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m_currentOutputSampleRate(0),
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m_currentCenterFrequency(0)
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{
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QString name = "DownChannelizer(" + m_sampleSink->objectName() + ")";
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setObjectName(name);
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}
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DownChannelizer::~DownChannelizer()
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{
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freeFilterChain();
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}
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void DownChannelizer::configure(MessageQueue* messageQueue, int sampleRate, int centerFrequency)
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{
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Message* cmd = new DSPConfigureChannelizer(sampleRate, centerFrequency);
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messageQueue->push(cmd);
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}
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void DownChannelizer::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool positiveOnly)
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{
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if(m_sampleSink == 0) {
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m_sampleBuffer.clear();
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return;
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}
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if (m_filterStages.size() == 0) // optimization when no downsampling is done anyway
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{
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m_sampleSink->feed(begin, end, positiveOnly);
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}
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else
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{
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m_mutex.lock();
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for(SampleVector::const_iterator sample = begin; sample != end; ++sample)
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{
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Sample s(*sample);
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FilterStages::iterator stage = m_filterStages.begin();
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for (; stage != m_filterStages.end(); ++stage)
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{
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if(!(*stage)->work(&s))
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{
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break;
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}
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}
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if(stage == m_filterStages.end())
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{
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m_sampleBuffer.push_back(s);
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}
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}
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m_mutex.unlock();
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m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), positiveOnly);
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m_sampleBuffer.clear();
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}
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}
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void DownChannelizer::start()
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{
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if (m_sampleSink != 0)
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{
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qDebug() << "DownChannelizer::start: thread: " << thread()
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<< " m_inputSampleRate: " << m_inputSampleRate
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<< " m_requestedOutputSampleRate: " << m_requestedOutputSampleRate
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<< " m_requestedCenterFrequency: " << m_requestedCenterFrequency;
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m_sampleSink->start();
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}
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}
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void DownChannelizer::stop()
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{
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if(m_sampleSink != 0)
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m_sampleSink->stop();
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}
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bool DownChannelizer::handleMessage(const Message& cmd)
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{
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qDebug() << "DownChannelizer::handleMessage: " << cmd.getIdentifier();
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// TODO: apply changes only if input sample rate or requested output sample rate change. Change of center frequency has no impact.
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if (DSPSignalNotification::match(cmd))
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{
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DSPSignalNotification& notif = (DSPSignalNotification&) cmd;
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m_inputSampleRate = notif.getSampleRate();
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qDebug() << "DownChannelizer::handleMessage: DSPSignalNotification: m_inputSampleRate: " << m_inputSampleRate;
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applyConfiguration();
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if (m_sampleSink != 0)
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{
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m_sampleSink->handleMessage(notif);
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}
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emit inputSampleRateChanged();
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return true;
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}
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else if (DSPConfigureChannelizer::match(cmd))
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{
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DSPConfigureChannelizer& chan = (DSPConfigureChannelizer&) cmd;
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m_requestedOutputSampleRate = chan.getSampleRate();
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m_requestedCenterFrequency = chan.getCenterFrequency();
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qDebug() << "DownChannelizer::handleMessage: DSPConfigureChannelizer:"
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<< " m_requestedOutputSampleRate: " << m_requestedOutputSampleRate
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<< " m_requestedCenterFrequency: " << m_requestedCenterFrequency;
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applyConfiguration();
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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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void DownChannelizer::applyConfiguration()
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{
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if (m_inputSampleRate == 0)
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{
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qDebug() << "DownChannelizer::applyConfiguration: m_inputSampleRate=0 aborting";
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return;
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}
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m_mutex.lock();
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freeFilterChain();
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m_currentCenterFrequency = createFilterChain(
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m_inputSampleRate / -2, m_inputSampleRate / 2,
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m_requestedCenterFrequency - m_requestedOutputSampleRate / 2, m_requestedCenterFrequency + m_requestedOutputSampleRate / 2);
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m_mutex.unlock();
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m_currentOutputSampleRate = m_inputSampleRate / (1 << m_filterStages.size());
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qDebug() << "DownChannelizer::applyConfiguration in=" << m_inputSampleRate
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<< ", req=" << m_requestedOutputSampleRate
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<< ", out=" << m_currentOutputSampleRate
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<< ", fc=" << m_currentCenterFrequency;
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if (m_sampleSink != 0)
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{
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MsgChannelizerNotification notif(m_currentOutputSampleRate, m_currentCenterFrequency);
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m_sampleSink->handleMessage(notif);
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}
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}
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DownChannelizer::FilterStage::FilterStage(Mode mode) :
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m_filter(new IntHalfbandFilterDB<DOWNCHANNELIZER_HB_FILTER_ORDER>),
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m_workFunction(0)
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{
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switch(mode) {
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case ModeCenter:
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m_workFunction = &IntHalfbandFilterDB<DOWNCHANNELIZER_HB_FILTER_ORDER>::workDecimateCenter;
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break;
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case ModeLowerHalf:
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m_workFunction = &IntHalfbandFilterDB<DOWNCHANNELIZER_HB_FILTER_ORDER>::workDecimateLowerHalf;
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break;
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case ModeUpperHalf:
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m_workFunction = &IntHalfbandFilterDB<DOWNCHANNELIZER_HB_FILTER_ORDER>::workDecimateUpperHalf;
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break;
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}
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}
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DownChannelizer::FilterStage::~FilterStage()
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{
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delete m_filter;
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}
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bool DownChannelizer::signalContainsChannel(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd) const
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{
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//qDebug(" testing signal [%f, %f], channel [%f, %f]", sigStart, sigEnd, chanStart, chanEnd);
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if(sigEnd <= sigStart)
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return false;
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if(chanEnd <= chanStart)
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return false;
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return (sigStart <= chanStart) && (sigEnd >= chanEnd);
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}
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Real DownChannelizer::createFilterChain(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd)
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{
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Real sigBw = sigEnd - sigStart;
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Real safetyMargin = sigBw / 20;
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Real rot = sigBw / 4;
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safetyMargin = 0;
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//fprintf(stderr, "Channelizer::createFilterChain: ");
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//fprintf(stderr, "Signal [%.1f, %.1f] (BW %.1f), Channel [%.1f, %.1f], Rot %.1f, Safety %.1f\n", sigStart, sigEnd, sigBw, chanStart, chanEnd, rot, safetyMargin);
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#if 1
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// check if it fits into the left half
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if(signalContainsChannel(sigStart + safetyMargin, sigStart + sigBw / 2.0 - safetyMargin, chanStart, chanEnd)) {
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//fprintf(stderr, "-> take left half (rotate by +1/4 and decimate by 2)\n");
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m_filterStages.push_back(new FilterStage(FilterStage::ModeLowerHalf));
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return createFilterChain(sigStart, sigStart + sigBw / 2.0, chanStart, chanEnd);
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}
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// check if it fits into the right half
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if(signalContainsChannel(sigEnd - sigBw / 2.0f + safetyMargin, sigEnd - safetyMargin, chanStart, chanEnd)) {
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//fprintf(stderr, "-> take right half (rotate by -1/4 and decimate by 2)\n");
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m_filterStages.push_back(new FilterStage(FilterStage::ModeUpperHalf));
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return createFilterChain(sigEnd - sigBw / 2.0f, sigEnd, chanStart, chanEnd);
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}
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// check if it fits into the center
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// Was: if(signalContainsChannel(sigStart + rot + safetyMargin, sigStart + rot + sigBw / 2.0f - safetyMargin, chanStart, chanEnd)) {
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if(signalContainsChannel(sigStart + rot + safetyMargin, sigEnd - rot - safetyMargin, chanStart, chanEnd)) {
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//fprintf(stderr, "-> take center half (decimate by 2)\n");
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m_filterStages.push_back(new FilterStage(FilterStage::ModeCenter));
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// Was: return createFilterChain(sigStart + rot, sigStart + sigBw / 2.0f + rot, chanStart, chanEnd);
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return createFilterChain(sigStart + rot, sigEnd - rot, chanStart, chanEnd);
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}
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#endif
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Real ofs = ((chanEnd - chanStart) / 2.0 + chanStart) - ((sigEnd - sigStart) / 2.0 + sigStart);
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//fprintf(stderr, "-> complete (final BW %.1f, frequency offset %.1f)\n", sigBw, ofs);
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return ofs;
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}
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void DownChannelizer::freeFilterChain()
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{
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for(FilterStages::iterator it = m_filterStages.begin(); it != m_filterStages.end(); ++it)
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delete *it;
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m_filterStages.clear();
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}
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