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98 lines
4.2 KiB
C++
98 lines
4.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// written by Christian Daniel //
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// Copyright (C) 2015-2020, 2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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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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#ifndef SDRBASE_DSP_DOWNCHANNELIZER_H
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#define SDRBASE_DSP_DOWNCHANNELIZER_H
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#include <list>
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#include <vector>
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#include "export.h"
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#include "dsp/inthalfbandfiltereo.h"
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#include "channelsamplesink.h"
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#define DOWNCHANNELIZER_HB_FILTER_ORDER 48
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class SDRBASE_API DownChannelizer : public ChannelSampleSink {
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public:
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DownChannelizer(ChannelSampleSink* sampleSink);
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virtual ~DownChannelizer();
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
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void setDecimation(unsigned int log2Decim, unsigned int filterChainHash); //!< Define channelizer with decimation factor and filter chain definition
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void setChannelization(int requestedSampleRate, qint64 requestedCenterFrequency); //!< Define channelizer with requested sample rate and center frequency (shift in the baseband)
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void setBasebandSampleRate(int basebandSampleRate, bool decim = false); //!< decim: true => use direct decimation false => use channel configuration
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int getBasebandSampleRate() const { return m_basebandSampleRate; }
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int getChannelSampleRate() const { return m_channelSampleRate; }
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int getChannelFrequencyOffset() const { return m_channelFrequencyOffset; }
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protected:
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struct FilterStage {
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enum Mode {
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ModeCenter,
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ModeLowerHalf,
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ModeUpperHalf
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};
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#ifdef SDR_RX_SAMPLE_24BIT
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typedef bool (IntHalfbandFilterEO<qint64, qint64, DOWNCHANNELIZER_HB_FILTER_ORDER, true>::*WorkFunction)(Sample* s);
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IntHalfbandFilterEO<qint64, qint64, DOWNCHANNELIZER_HB_FILTER_ORDER, true>* m_filter;
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#else
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typedef bool (IntHalfbandFilterEO<qint32, qint32, DOWNCHANNELIZER_HB_FILTER_ORDER, true>::*WorkFunction)(Sample* s);
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IntHalfbandFilterEO<qint32, qint32, DOWNCHANNELIZER_HB_FILTER_ORDER, true>* m_filter;
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#endif
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WorkFunction m_workFunction;
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Mode m_mode;
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bool m_sse;
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FilterStage(Mode mode);
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~FilterStage();
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bool work(Sample* sample)
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{
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return (m_filter->*m_workFunction)(sample);
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}
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};
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typedef std::list<FilterStage*> FilterStages;
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FilterStages m_filterStages;
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bool m_filterChainSetMode;
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ChannelSampleSink* m_sampleSink; //!< Demodulator
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int m_basebandSampleRate;
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int m_requestedOutputSampleRate;
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int m_requestedCenterFrequency;
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int m_channelSampleRate;
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int m_channelFrequencyOffset;
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unsigned int m_log2Decim;
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unsigned int m_filterChainHash;
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SampleVector m_sampleBuffer;
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void applyChannelization();
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void applyDecimation();
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static Real channelMinSpace(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd);
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Real createFilterChain(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd);
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double setFilterChain(const std::vector<unsigned int>& stageIndexes);
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void freeFilterChain();
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void debugFilterChain();
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};
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#endif // SDRBASE_DSP_DOWNCHANNELIZER_H
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