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103 lines
3.5 KiB
C++
103 lines
3.5 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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#ifndef SDRBASE_DSP_DOWNCHANNELIZER_H
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#define SDRBASE_DSP_DOWNCHANNELIZER_H
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#include <dsp/basebandsamplesink.h>
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#include <list>
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#include <QMutex>
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#include "util/export.h"
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#include "util/message.h"
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class MessageQueue;
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class IntHalfbandFilter;
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class SDRANGEL_API DownChannelizer : public BasebandSampleSink {
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Q_OBJECT
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public:
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class SDRANGEL_API MsgChannelizerNotification : public Message {
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MESSAGE_CLASS_DECLARATION
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public:
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MsgChannelizerNotification(int samplerate, qint64 frequencyOffset) :
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Message(),
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m_sampleRate(samplerate),
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m_frequencyOffset(frequencyOffset)
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{ }
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int getSampleRate() const { return m_sampleRate; }
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qint64 getFrequencyOffset() const { return m_frequencyOffset; }
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private:
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int m_sampleRate;
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qint64 m_frequencyOffset;
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};
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DownChannelizer(BasebandSampleSink* sampleSink);
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virtual ~DownChannelizer();
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void configure(MessageQueue* messageQueue, int sampleRate, int centerFrequency);
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int getInputSampleRate() const { return m_inputSampleRate; }
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virtual void start();
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virtual void stop();
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool positiveOnly);
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virtual bool handleMessage(const Message& cmd);
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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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typedef bool (IntHalfbandFilter::*WorkFunction)(Sample* s);
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IntHalfbandFilter* m_filter;
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WorkFunction m_workFunction;
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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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BasebandSampleSink* m_sampleSink; //!< Demodulator
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int m_inputSampleRate;
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int m_requestedOutputSampleRate;
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int m_requestedCenterFrequency;
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int m_currentOutputSampleRate;
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int m_currentCenterFrequency;
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SampleVector m_sampleBuffer;
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QMutex m_mutex;
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void applyConfiguration();
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bool signalContainsChannel(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd) const;
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Real createFilterChain(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd);
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void freeFilterChain();
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signals:
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void inputSampleRateChanged();
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};
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#endif // SDRBASE_DSP_DOWNCHANNELIZER_H
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