sdrangel/sdrbase/dsp/downchannelizer.h

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2016-10-17 06:58:49 +00:00
///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 F4EXB //
// written by Edouard Griffiths //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef SDRBASE_DSP_DOWNCHANNELIZER_H
#define SDRBASE_DSP_DOWNCHANNELIZER_H
#include <dsp/basebandsamplesink.h>
#include <list>
#include <QMutex>
#include "export.h"
#include "util/message.h"
#include "dsp/inthalfbandfiltereo.h"
#define DOWNCHANNELIZER_HB_FILTER_ORDER 48
class MessageQueue;
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class SDRBASE_API DownChannelizer : public BasebandSampleSink {
Q_OBJECT
public:
class MsgChannelizerNotification : public Message {
MESSAGE_CLASS_DECLARATION
public:
MsgChannelizerNotification(int samplerate, qint64 frequencyOffset) :
Message(),
m_sampleRate(samplerate),
m_frequencyOffset(frequencyOffset)
{ }
int getSampleRate() const { return m_sampleRate; }
qint64 getFrequencyOffset() const { return m_frequencyOffset; }
static MsgChannelizerNotification* create(int samplerate, qint64 frequencyOffset)
{
return new MsgChannelizerNotification(samplerate, frequencyOffset);
}
private:
int m_sampleRate;
qint64 m_frequencyOffset;
};
DownChannelizer(BasebandSampleSink* sampleSink);
virtual ~DownChannelizer();
void configure(MessageQueue* messageQueue, int sampleRate, int centerFrequency);
int getInputSampleRate() const { return m_inputSampleRate; }
int getRequestedCenterFrequency() const { return m_requestedCenterFrequency; }
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virtual void start();
virtual void stop();
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);
protected:
struct FilterStage {
enum Mode {
ModeCenter,
ModeLowerHalf,
ModeUpperHalf
};
#ifdef SDR_RX_SAMPLE_24BIT
typedef bool (IntHalfbandFilterEO<qint64, qint64, DOWNCHANNELIZER_HB_FILTER_ORDER>::*WorkFunction)(Sample* s);
IntHalfbandFilterEO<qint64, qint64, DOWNCHANNELIZER_HB_FILTER_ORDER>* m_filter;
#else
typedef bool (IntHalfbandFilterEO<qint32, qint32, DOWNCHANNELIZER_HB_FILTER_ORDER>::*WorkFunction)(Sample* s);
IntHalfbandFilterEO<qint32, qint32, DOWNCHANNELIZER_HB_FILTER_ORDER>* m_filter;
#endif
WorkFunction m_workFunction;
Mode m_mode;
bool m_sse;
FilterStage(Mode mode);
~FilterStage();
bool work(Sample* sample)
{
return (m_filter->*m_workFunction)(sample);
}
};
typedef std::list<FilterStage*> FilterStages;
FilterStages m_filterStages;
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BasebandSampleSink* m_sampleSink; //!< Demodulator
int m_inputSampleRate;
int m_requestedOutputSampleRate;
int m_requestedCenterFrequency;
int m_currentOutputSampleRate;
int m_currentCenterFrequency;
SampleVector m_sampleBuffer;
QMutex m_mutex;
void applyConfiguration();
bool signalContainsChannel(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd) const;
Real createFilterChain(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd);
void freeFilterChain();
void debugFilterChain();
signals:
void inputSampleRateChanged();
};
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#endif // SDRBASE_DSP_DOWNCHANNELIZER_H