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338 lines
12 KiB
C++
338 lines
12 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 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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// (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 <QString>
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#include <QDebug>
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#include <algorithm>
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#include "inthalfbandfilter.h"
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#include "dspcommands.h"
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#include "hbfilterchainconverter.h"
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#include "upsamplechannelizer.h"
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UpSampleChannelizer::UpSampleChannelizer(ChannelSampleSource* sampleSource) :
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m_filterChainSetMode(false),
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m_sampleSource(sampleSource),
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m_outputSampleRate(0),
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m_requestedInputSampleRate(0),
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m_requestedCenterFrequency(0),
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m_currentInputSampleRate(0),
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m_currentCenterFrequency(0)
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{
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}
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UpSampleChannelizer::~UpSampleChannelizer()
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{
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freeFilterChain();
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}
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void UpSampleChannelizer::pullOne(Sample& sample)
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{
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if (m_sampleSource == nullptr)
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{
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m_sampleBuffer.clear();
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return;
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}
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unsigned int log2Interp = m_filterStages.size();
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if (log2Interp == 0) // optimization when no downsampling is done anyway
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{
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m_sampleSource->pullOne(sample);
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}
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else
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{
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FilterStages::iterator stage = m_filterStages.begin();
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std::vector<Sample>::iterator stageSample = m_stageSamples.begin();
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for (; stage != m_filterStages.end(); ++stage, ++stageSample)
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{
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if(stage == m_filterStages.end() - 1)
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{
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if ((*stage)->work(&m_sampleIn, &(*stageSample)))
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{
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m_sampleSource->pullOne(m_sampleIn); // get new input sample
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}
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}
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else
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{
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if (!(*stage)->work(&(*(stageSample+1)), &(*stageSample)))
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{
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break;
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}
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}
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}
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sample = *m_stageSamples.begin();
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}
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}
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void UpSampleChannelizer::pull(SampleVector::iterator begin, unsigned int nbSamples)
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{
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if (m_sampleSource == nullptr)
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{
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m_sampleBuffer.clear();
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return;
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}
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unsigned int log2Interp = m_filterStages.size();
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if (log2Interp == 0) // optimization when no downsampling is done anyway
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{
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m_sampleSource->pull(begin, nbSamples);
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}
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else
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{
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std::for_each(
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begin,
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begin + nbSamples,
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[this](Sample& s) {
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pullOne(s);
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}
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);
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}
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}
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void UpSampleChannelizer::applyConfiguration()
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{
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m_filterChainSetMode = false;
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if (m_outputSampleRate == 0)
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{
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qDebug() << "UpSampleChannelizer::applyConfiguration: aborting (out=0):"
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<< " out:" << m_outputSampleRate
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<< " req:" << m_requestedInputSampleRate
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<< " in:" << m_currentInputSampleRate
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<< " fc:" << m_currentCenterFrequency;
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return;
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}
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freeFilterChain();
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m_currentCenterFrequency = createFilterChain(
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m_outputSampleRate / -2, m_outputSampleRate / 2,
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m_requestedCenterFrequency - m_requestedInputSampleRate / 2, m_requestedCenterFrequency + m_requestedInputSampleRate / 2);
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m_currentInputSampleRate = m_outputSampleRate / (1 << m_filterStages.size());
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qDebug() << "UpSampleChannelizer::applyConfiguration: done: "
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<< " out:" << m_outputSampleRate
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<< " req:" << m_requestedInputSampleRate
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<< " in:" << m_currentInputSampleRate
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<< " fc:" << m_currentCenterFrequency;
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}
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void UpSampleChannelizer::applyConfiguration(int requestedSampleRate, qint64 requestedCenterFrequency)
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{
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m_requestedInputSampleRate = requestedSampleRate;
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m_requestedCenterFrequency = requestedCenterFrequency;
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applyConfiguration();
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}
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void UpSampleChannelizer::setOutputSampleRate(int outputSampleRate)
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{
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m_outputSampleRate = outputSampleRate;
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applyConfiguration();
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}
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void UpSampleChannelizer::setInterpolation(unsigned int log2Interp, unsigned int filterChainHash)
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{
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m_filterChainSetMode = true;
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std::vector<unsigned int> stageIndexes;
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m_currentCenterFrequency = m_outputSampleRate * HBFilterChainConverter::convertToIndexes(log2Interp, filterChainHash, stageIndexes);
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m_requestedCenterFrequency = m_currentCenterFrequency;
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freeFilterChain();
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m_currentCenterFrequency = m_outputSampleRate * setFilterChain(stageIndexes);
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m_currentInputSampleRate = m_outputSampleRate / (1 << m_filterStages.size());
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m_requestedInputSampleRate = m_currentInputSampleRate;
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qDebug() << "UpSampleChannelizer::setInterpolation: done:"
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<< " in:" << m_outputSampleRate
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<< " out:" << m_currentInputSampleRate
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<< " fc:" << m_currentCenterFrequency;
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}
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#ifdef USE_SSE4_1
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UpSampleChannelizer::FilterStage::FilterStage(Mode mode) :
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m_filter(new IntHalfbandFilterEO1<UPSAMPLECHANNELIZER_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 = &IntHalfbandFilterEO1<UPSAMPLECHANNELIZER_HB_FILTER_ORDER>::workInterpolateCenter;
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break;
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case ModeLowerHalf:
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m_workFunction = &IntHalfbandFilterEO1<UPSAMPLECHANNELIZER_HB_FILTER_ORDER>::workInterpolateLowerHalf;
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break;
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case ModeUpperHalf:
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m_workFunction = &IntHalfbandFilterEO1<UPSAMPLECHANNELIZER_HB_FILTER_ORDER>::workInterpolateUpperHalf;
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break;
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}
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}
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#else
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UpSampleChannelizer::FilterStage::FilterStage(Mode mode) :
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m_filter(new IntHalfbandFilterDB<qint32, UPSAMPLECHANNELIZER_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<qint32, UPSAMPLECHANNELIZER_HB_FILTER_ORDER>::workInterpolateCenter;
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break;
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case ModeLowerHalf:
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m_workFunction = &IntHalfbandFilterDB<qint32, UPSAMPLECHANNELIZER_HB_FILTER_ORDER>::workInterpolateLowerHalf;
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break;
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case ModeUpperHalf:
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m_workFunction = &IntHalfbandFilterDB<qint32, UPSAMPLECHANNELIZER_HB_FILTER_ORDER>::workInterpolateUpperHalf;
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break;
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}
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}
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#endif
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UpSampleChannelizer::FilterStage::~FilterStage()
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{
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delete m_filter;
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}
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bool UpSampleChannelizer::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 UpSampleChannelizer::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 rot = sigBw / 4;
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Sample s;
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qDebug() << "UpSampleChannelizer::createFilterChain: start:"
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<< " sig: [" << sigStart << ":" << sigEnd << "]"
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<< " BW: " << sigBw
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<< " chan: [" << chanStart << ":" << chanEnd << "]"
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<< " rot: " << rot;
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// check if it fits into the left half
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if(signalContainsChannel(sigStart, sigStart + sigBw / 2.0, chanStart, chanEnd))
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{
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qDebug() << "UpSampleChannelizer::createFilterChain: take left half (rotate by +1/4 and decimate by 2):"
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<< " [" << m_filterStages.size() << "]"
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<< " sig: [" << sigStart << ":" << sigStart + sigBw / 2.0 << "]";
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m_filterStages.push_back(new FilterStage(FilterStage::ModeLowerHalf));
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m_stageSamples.push_back(s);
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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, sigEnd, chanStart, chanEnd))
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{
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qDebug() << "UpSampleChannelizer::createFilterChain: take right half (rotate by -1/4 and decimate by 2):"
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<< " [" << m_filterStages.size() << "]"
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<< " sig: [" << sigEnd - sigBw / 2.0f << ":" << sigEnd << "]";
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m_filterStages.push_back(new FilterStage(FilterStage::ModeUpperHalf));
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m_stageSamples.push_back(s);
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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, sigEnd - rot, chanStart, chanEnd))
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{
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qDebug() << "UpSampleChannelizer::createFilterChain: take center half (decimate by 2):"
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<< " [" << m_filterStages.size() << "]"
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<< " sig: [" << sigStart + rot << ":" << sigEnd - rot << "]";
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m_filterStages.push_back(new FilterStage(FilterStage::ModeCenter));
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m_stageSamples.push_back(s);
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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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Real ofs = ((chanEnd - chanStart) / 2.0 + chanStart) - ((sigEnd - sigStart) / 2.0 + sigStart);
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qDebug() << "UpSampleChannelizer::createFilterChain: complete:"
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<< " #stages: " << m_filterStages.size()
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<< " BW: " << sigBw
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<< " ofs: " << ofs;
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return ofs;
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}
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double UpSampleChannelizer::setFilterChain(const std::vector<unsigned int>& stageIndexes)
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{
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// filters are described from lower to upper level but the chain is constructed the other way round
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std::vector<unsigned int>::const_reverse_iterator rit = stageIndexes.rbegin();
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double ofs = 0.0, ofs_stage = 0.25;
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Sample s;
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// Each index is a base 3 number with 0 = low, 1 = center, 2 = high
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// Functions at upper level will convert a number to base 3 to describe the filter chain. Common converting
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// algorithms will go from LSD to MSD. This explains the reverse order.
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for (; rit != stageIndexes.rend(); ++rit)
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{
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if (*rit == 0)
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{
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m_filterStages.push_back(new FilterStage(FilterStage::ModeLowerHalf));
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m_stageSamples.push_back(s);
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ofs -= ofs_stage;
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qDebug("UpSampleChannelizer::setFilterChain: lower half: ofs: %f", ofs);
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}
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else if (*rit == 1)
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{
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m_filterStages.push_back(new FilterStage(FilterStage::ModeCenter));
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m_stageSamples.push_back(s);
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qDebug("UpSampleChannelizer::setFilterChain: center: ofs: %f", ofs);
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}
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else if (*rit == 2)
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{
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m_filterStages.push_back(new FilterStage(FilterStage::ModeUpperHalf));
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m_stageSamples.push_back(s);
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ofs += ofs_stage;
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qDebug("UpSampleChannelizer::setFilterChain: upper half: ofs: %f", ofs);
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}
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ofs_stage /= 2;
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}
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qDebug() << "UpSampleChannelizer::setFilterChain: complete:"
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<< " #stages: " << m_filterStages.size()
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<< " ofs: " << ofs;
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return ofs;
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}
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void UpSampleChannelizer::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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m_stageSamples.clear();
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}
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