#include <downchannelizer.h>

Inheritance diagram for DownChannelizer:

Collaboration diagram for DownChannelizer:

Classes
struct	FilterStage

class	MsgChannelizerNotification

class	MsgSetChannelizer

Signals
void	inputSampleRateChanged ()

Public Member Functions
	DownChannelizer (BasebandSampleSink *sampleSink)

virtual	~DownChannelizer ()

void	configure (MessageQueue *messageQueue, int sampleRate, int centerFrequency)

void	set (MessageQueue *messageQueue, unsigned int log2Decim, unsigned int filterChainHash)

int	getInputSampleRate () const

int	getRequestedCenterFrequency () const

virtual void	start ()

virtual void	stop ()

virtual void	feed (const SampleVector::const_iterator &begin, const SampleVector::const_iterator &end, bool positiveOnly)

virtual bool	handleMessage (const Message &cmd)
	Processing of a message. Returns true if message has actually been processed. More...

Public Member Functions inherited from BasebandSampleSink
	BasebandSampleSink ()

virtual	~BasebandSampleSink ()

MessageQueue *	getInputMessageQueue ()
	Get the queue for asynchronous inbound communication. More...

virtual void	setMessageQueueToGUI (MessageQueue *queue)

MessageQueue *	getMessageQueueToGUI ()

Protected Types
typedef std::list< FilterStage * >	FilterStages

Protected Member Functions
void	applyConfiguration ()

void	applySetting (unsigned int log2Decim, unsigned int filterChainHash)

bool	signalContainsChannel (Real sigStart, Real sigEnd, Real chanStart, Real chanEnd) const

Real	createFilterChain (Real sigStart, Real sigEnd, Real chanStart, Real chanEnd)

void	setFilterChain (const std::vector< unsigned int > &stageIndexes)

void	freeFilterChain ()

void	debugFilterChain ()

Protected Attributes
FilterStages	m_filterStages

bool	m_filterChainSetMode

BasebandSampleSink *	m_sampleSink
	Demodulator. More...

int	m_inputSampleRate

int	m_requestedOutputSampleRate

int	m_requestedCenterFrequency

int	m_currentOutputSampleRate

int	m_currentCenterFrequency

SampleVector	m_sampleBuffer

QMutex	m_mutex

Protected Attributes inherited from BasebandSampleSink
MessageQueue	m_inputMessageQueue
	Queue for asynchronous inbound communication. More...

MessageQueue *	m_guiMessageQueue
	Input message queue to the GUI. More...

Additional Inherited Members
Protected Slots inherited from BasebandSampleSink
void	handleInputMessages ()

Detailed Description

Definition at line 34 of file downchannelizer.h.

Member Typedef Documentation

◆ FilterStages

typedef std::list<FilterStage*> DownChannelizer::FilterStages

protected

Definition at line 119 of file downchannelizer.h.

Constructor & Destructor Documentation

◆ DownChannelizer()

DownChannelizer::DownChannelizer ( BasebandSampleSink * sampleSink )

Definition at line 30 of file downchannelizer.cpp.

                                                                :
     m_filterChainSetMode(false),
     m_sampleSink(sampleSink),
     m_inputSampleRate(0),
     m_requestedOutputSampleRate(0),
     m_requestedCenterFrequency(0),
     m_currentOutputSampleRate(0),
     m_currentCenterFrequency(0)
 {
     QString name = "DownChannelizer(" + m_sampleSink->objectName() + ")";
     setObjectName(name);
 }

◆ ~DownChannelizer()

DownChannelizer::~DownChannelizer ( )

virtual

Definition at line 43 of file downchannelizer.cpp.

References freeFilterChain().

 {
     freeFilterChain();
 }

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Member Function Documentation

◆ applyConfiguration()

void DownChannelizer::applyConfiguration ( )

protected

Definition at line 184 of file downchannelizer.cpp.

References DownChannelizer::MsgChannelizerNotification::create(), createFilterChain(), freeFilterChain(), BasebandSampleSink::getInputMessageQueue(), m_currentCenterFrequency, m_currentOutputSampleRate, m_filterChainSetMode, m_filterStages, m_inputSampleRate, m_mutex, m_requestedCenterFrequency, m_requestedOutputSampleRate, m_sampleSink, and MessageQueue::push().

Referenced by handleMessage().

 {
     m_filterChainSetMode = false;
 
     if (m_inputSampleRate == 0)
     {
         qDebug() << "DownChannelizer::applyConfiguration: m_inputSampleRate=0 aborting";
         return;
     }
 
     m_mutex.lock();
 
     freeFilterChain();
 
     m_currentCenterFrequency = createFilterChain(
         m_inputSampleRate / -2, m_inputSampleRate / 2,
         m_requestedCenterFrequency - m_requestedOutputSampleRate / 2, m_requestedCenterFrequency + m_requestedOutputSampleRate / 2);
 
     m_mutex.unlock();
 
     //debugFilterChain();
 
     m_currentOutputSampleRate = m_inputSampleRate / (1 << m_filterStages.size());
 
     qDebug() << "DownChannelizer::applyConfiguration in=" << m_inputSampleRate
             << ", req=" << m_requestedOutputSampleRate
             << ", out=" << m_currentOutputSampleRate
             << ", fc=" << m_currentCenterFrequency;
 
     if (m_sampleSink != 0)
     {
         MsgChannelizerNotification *notif = MsgChannelizerNotification::create(m_currentOutputSampleRate, m_currentCenterFrequency);
         m_sampleSink->getInputMessageQueue()->push(notif);
     }
 }

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◆ applySetting()

void DownChannelizer::applySetting	(	unsigned int	log2Decim,
		unsigned int	filterChainHash
	)

protected

Definition at line 220 of file downchannelizer.cpp.

References HBFilterChainConverter::convertToIndexes(), DownChannelizer::MsgChannelizerNotification::create(), DownChannelizer::FilterStage::FilterStage(), freeFilterChain(), BasebandSampleSink::getInputMessageQueue(), m_currentCenterFrequency, m_currentOutputSampleRate, m_filterChainSetMode, m_filterStages, m_inputSampleRate, m_mutex, m_requestedCenterFrequency, m_requestedOutputSampleRate, m_sampleSink, MessageQueue::push(), and setFilterChain().

Referenced by handleMessage().

 {
     m_filterChainSetMode = true;
     std::vector<unsigned int> stageIndexes;
     m_currentCenterFrequency = m_inputSampleRate * HBFilterChainConverter::convertToIndexes(log2Decim, filterChainHash, stageIndexes);
     m_requestedCenterFrequency = m_currentCenterFrequency;
 
     m_mutex.lock();
     freeFilterChain();
     setFilterChain(stageIndexes);
     m_mutex.unlock();
 
     m_currentOutputSampleRate = m_inputSampleRate / (1 << m_filterStages.size());
     m_requestedOutputSampleRate = m_currentOutputSampleRate;
 
     qDebug() << "DownChannelizer::applySetting inputSampleRate:" << m_inputSampleRate
             << " currentOutputSampleRate: " << m_currentOutputSampleRate
             << " currentCenterFrequency: " << m_currentCenterFrequency
             << " nb_filters: " << stageIndexes.size()
             << " nb_stages: " << m_filterStages.size();
 
     if (m_sampleSink != 0)
     {
         MsgChannelizerNotification *notif = MsgChannelizerNotification::create(m_currentOutputSampleRate, m_currentCenterFrequency);
         m_sampleSink->getInputMessageQueue()->push(notif);
     }
 }

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◆ configure()

void DownChannelizer::configure	(	MessageQueue *	messageQueue,
		int	sampleRate,
		int	centerFrequency
	)

Definition at line 48 of file downchannelizer.cpp.

References MessageQueue::push().

Referenced by FreqTracker::configureChannelizer(), LoRaDemod::handleMessage(), AMDemod::handleMessage(), WFMDemod::handleMessage(), DSDDemod::handleMessage(), UDPSink::handleMessage(), SSBDemod::handleMessage(), NFMDemod::handleMessage(), BFMDemod::handleMessage(), FreeDVDemod::handleMessage(), ChannelAnalyzer::handleMessage(), DATVDemod::handleMessage(), and ATVDemod::handleMessage().

 {
     Message* cmd = new DSPConfigureChannelizer(sampleRate, centerFrequency);
     messageQueue->push(cmd);
 }

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◆ createFilterChain()

Real DownChannelizer::createFilterChain	(	Real	sigStart,
		Real	sigEnd,
		Real	chanStart,
		Real	chanEnd
	)

protected

Definition at line 307 of file downchannelizer.cpp.

References DownChannelizer::FilterStage::FilterStage(), m_filterStages, DownChannelizer::FilterStage::ModeCenter, DownChannelizer::FilterStage::ModeLowerHalf, DownChannelizer::FilterStage::ModeUpperHalf, and signalContainsChannel().

Referenced by applyConfiguration().

 {
     Real sigBw = sigEnd - sigStart;
     Real rot = sigBw / 4;
 
     //qDebug("DownChannelizer::createFilterChain: Signal [%.1f, %.1f] (BW %.1f), Channel [%.1f, %.1f], Rot %.1f", sigStart, sigEnd, sigBw, chanStart, chanEnd, rot);
 
     // check if it fits into the left half
     if(signalContainsChannel(sigStart, sigStart + sigBw / 2.0, chanStart, chanEnd))
     {
         //qDebug("DownChannelizer::createFilterChain: -> take left half (rotate by +1/4 and decimate by 2)");
         m_filterStages.push_back(new FilterStage(FilterStage::ModeLowerHalf));
         return createFilterChain(sigStart, sigStart + sigBw / 2.0, chanStart, chanEnd);
     }
 
     // check if it fits into the right half
     if(signalContainsChannel(sigEnd - sigBw / 2.0f, sigEnd, chanStart, chanEnd))
     {
         //qDebug("DownChannelizer::createFilterChain: -> take right half (rotate by -1/4 and decimate by 2)");
         m_filterStages.push_back(new FilterStage(FilterStage::ModeUpperHalf));
         return createFilterChain(sigEnd - sigBw / 2.0f, sigEnd, chanStart, chanEnd);
     }
 
     // check if it fits into the center
     if(signalContainsChannel(sigStart + rot, sigEnd - rot, chanStart, chanEnd))
     {
         //qDebug("DownChannelizer::createFilterChain: -> take center half (decimate by 2)");
         m_filterStages.push_back(new FilterStage(FilterStage::ModeCenter));
         return createFilterChain(sigStart + rot, sigEnd - rot, chanStart, chanEnd);
     }
 
     Real ofs = ((chanEnd - chanStart) / 2.0 + chanStart) - ((sigEnd - sigStart) / 2.0 + sigStart);
     //qDebug("DownChannelizer::createFilterChain: -> complete (final BW %.1f, frequency offset %.1f)", sigBw, ofs);
     return ofs;
 }

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◆ debugFilterChain()

void DownChannelizer::debugFilterChain ( )

protected

Definition at line 370 of file downchannelizer.cpp.

References m_filterStages, DownChannelizer::FilterStage::ModeCenter, DownChannelizer::FilterStage::ModeLowerHalf, and DownChannelizer::FilterStage::ModeUpperHalf.

 {
     qDebug("DownChannelizer::debugFilterChain: %lu stages", m_filterStages.size());
 
     for(FilterStages::iterator it = m_filterStages.begin(); it != m_filterStages.end(); ++it)
     {
         switch ((*it)->m_mode)
         {
         case FilterStage::ModeCenter:
             qDebug("DownChannelizer::debugFilterChain: center %s", (*it)->m_sse ? "sse" : "no_sse");
             break;
         case FilterStage::ModeLowerHalf:
             qDebug("DownChannelizer::debugFilterChain: lower %s", (*it)->m_sse ? "sse" : "no_sse");
             break;
         case FilterStage::ModeUpperHalf:
             qDebug("DownChannelizer::debugFilterChain: upper %s", (*it)->m_sse ? "sse" : "no_sse");
             break;
         default:
             qDebug("DownChannelizer::debugFilterChain: none %s", (*it)->m_sse ? "sse" : "no_sse");
             break;
         }
     }
 }

◆ feed()

void DownChannelizer::feed	(	const SampleVector::const_iterator &	begin,
		const SampleVector::const_iterator &	end,
		bool	positiveOnly
	)

virtual

Implements BasebandSampleSink.

Definition at line 60 of file downchannelizer.cpp.

References BasebandSampleSink::feed(), m_filterStages, Sample::m_imag, m_mutex, Sample::m_real, m_sampleBuffer, and m_sampleSink.

 {
     if(m_sampleSink == 0) {
         m_sampleBuffer.clear();
         return;
     }
 
     if (m_filterStages.size() == 0) // optimization when no downsampling is done anyway
     {
         m_sampleSink->feed(begin, end, positiveOnly);
     }
     else
     {
         m_mutex.lock();
 
         for(SampleVector::const_iterator sample = begin; sample != end; ++sample)
         {
             Sample s(*sample);
             FilterStages::iterator stage = m_filterStages.begin();
 
             for (; stage != m_filterStages.end(); ++stage)
             {
 #ifndef SDR_RX_SAMPLE_24BIT
                 s.m_real /= 2; // avoid saturation on 16 bit samples
                 s.m_imag /= 2;
 #endif
                 if(!(*stage)->work(&s))
                 {
                     break;
                 }
             }
 
             if(stage == m_filterStages.end())
             {
 #ifdef SDR_RX_SAMPLE_24BIT
                 s.m_real /= (1<<(m_filterStages.size())); // on 32 bit samples there is enough headroom to just divide the final result
                 s.m_imag /= (1<<(m_filterStages.size()));
 #endif
                 m_sampleBuffer.push_back(s);
             }
         }
 
         m_mutex.unlock();
 
         m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), positiveOnly);
         m_sampleBuffer.clear();
     }
 }

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◆ freeFilterChain()

void DownChannelizer::freeFilterChain ( )

protected

Definition at line 363 of file downchannelizer.cpp.

References m_filterStages.

Referenced by applyConfiguration(), applySetting(), and ~DownChannelizer().

 {
     for(FilterStages::iterator it = m_filterStages.begin(); it != m_filterStages.end(); ++it)
         delete *it;
     m_filterStages.clear();
 }

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◆ getInputSampleRate()

int DownChannelizer::getInputSampleRate ( ) const

inline

Definition at line 83 of file downchannelizer.h.

Referenced by ATVDemod::channelSampleRateChanged(), ChannelAnalyzerGUI::getRequestedChannelSampleRate(), DATVDemod::handleMessage(), and ATVDemod::handleMessage().

83 { return m_inputSampleRate; }

DownChannelizer::m_inputSampleRate

int m_inputSampleRate

Definition: downchannelizer.h:123

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◆ getRequestedCenterFrequency()

int DownChannelizer::getRequestedCenterFrequency ( ) const

inline

Definition at line 84 of file downchannelizer.h.

84 { return m_requestedCenterFrequency; }

DownChannelizer::m_requestedCenterFrequency

int m_requestedCenterFrequency

Definition: downchannelizer.h:125

◆ handleMessage()

bool DownChannelizer::handleMessage ( const Message & cmd )

virtual

Processing of a message. Returns true if message has actually been processed.

Implements BasebandSampleSink.

Definition at line 127 of file downchannelizer.cpp.

References applyConfiguration(), applySetting(), DSPConfigureChannelizer::getCenterFrequency(), DownChannelizer::MsgSetChannelizer::getFilterChainHash(), Message::getIdentifier(), BasebandSampleSink::getInputMessageQueue(), DownChannelizer::MsgSetChannelizer::getLog2Decim(), DSPSignalNotification::getSampleRate(), DSPConfigureChannelizer::getSampleRate(), BasebandSampleSink::handleMessage(), inputSampleRateChanged(), m_filterChainSetMode, m_inputSampleRate, m_requestedCenterFrequency, m_requestedOutputSampleRate, m_sampleSink, Message::match(), and MessageQueue::push().

 {
     // TODO: apply changes only if input sample rate or requested output sample rate change. Change of center frequency has no impact.
 
     if (DSPSignalNotification::match(cmd))
     {
         DSPSignalNotification& notif = (DSPSignalNotification&) cmd;
         m_inputSampleRate = notif.getSampleRate();
         qDebug() << "DownChannelizer::handleMessage: DSPSignalNotification: m_inputSampleRate: " << m_inputSampleRate;
 
         if (!m_filterChainSetMode) {
             applyConfiguration();
         }
 
         if (m_sampleSink != 0)
         {
             DSPSignalNotification* rep = new DSPSignalNotification(notif); // make a copy
             m_sampleSink->getInputMessageQueue()->push(rep);
         }
 
         emit inputSampleRateChanged();
         return true;
     }
     else if (DSPConfigureChannelizer::match(cmd))
     {
         DSPConfigureChannelizer& chan = (DSPConfigureChannelizer&) cmd;
         m_requestedOutputSampleRate = chan.getSampleRate();
         m_requestedCenterFrequency = chan.getCenterFrequency();
 
             // qDebug() << "DownChannelizer::handleMessage: DSPConfigureChannelizer:"
             //      << " m_requestedOutputSampleRate: " << m_requestedOutputSampleRate
             //      << " m_requestedCenterFrequency: " << m_requestedCenterFrequency;
 
         applyConfiguration();
 
         return true;
     }
     else if (MsgSetChannelizer::match(cmd))
     {
         MsgSetChannelizer& chan = (MsgSetChannelizer&) cmd;
         qDebug() << "DownChannelizer::handleMessage: MsgSetChannelizer";
         applySetting(chan.getLog2Decim(), chan.getFilterChainHash());
 
         return true;
     }
     else if (BasebandSampleSink::MsgThreadedSink::match(cmd))
     {
         qDebug() << "DownChannelizer::handleMessage: MsgThreadedSink: forwarded to demod";
         return m_sampleSink->handleMessage(cmd); // this message is passed to the demod
     }
     else
     {
         qDebug() << "DownChannelizer::handleMessage: " << cmd.getIdentifier() << " unhandled";
         return false;
     }
 }

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◆ inputSampleRateChanged

void DownChannelizer::inputSampleRateChanged ( )

signal

Referenced by handleMessage().

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◆ set()

void DownChannelizer::set	(	MessageQueue *	messageQueue,
		unsigned int	log2Decim,
		unsigned int	filterChainHash
	)

Definition at line 54 of file downchannelizer.cpp.

References MessageQueue::push().

Referenced by LocalSink::handleMessage(), and RemoteSink::handleMessage().

 {
     Message* cmd = new MsgSetChannelizer(log2Decim, filterChainHash);
     messageQueue->push(cmd);
 }

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◆ setFilterChain()

void DownChannelizer::setFilterChain ( const std::vector< unsigned int > & stageIndexes )

protected

Definition at line 343 of file downchannelizer.cpp.

References DownChannelizer::FilterStage::FilterStage(), m_filterStages, DownChannelizer::FilterStage::ModeCenter, DownChannelizer::FilterStage::ModeLowerHalf, and DownChannelizer::FilterStage::ModeUpperHalf.

Referenced by applySetting().

 {
     // filters are described from lower to upper level but the chain is constructed the other way round
     std::vector<unsigned int>::const_reverse_iterator rit = stageIndexes.rbegin();
 
     // Each index is a base 3 number with 0 = low, 1 = center, 2 = high
     // Functions at upper level will convert a number to base 3 to describe the filter chain. Common converting
     // algorithms will go from LSD to MSD. This explains the reverse order.
     for (; rit != stageIndexes.rend(); ++rit)
     {
         if (*rit == 0) {
             m_filterStages.push_back(new FilterStage(FilterStage::ModeLowerHalf));
         } else if (*rit == 1) {
             m_filterStages.push_back(new FilterStage(FilterStage::ModeCenter));
         } else if (*rit == 2) {
             m_filterStages.push_back(new FilterStage(FilterStage::ModeUpperHalf));
         }
     }
 }

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◆ signalContainsChannel()

bool DownChannelizer::signalContainsChannel	(	Real	sigStart,
		Real	sigEnd,
		Real	chanStart,
		Real	chanEnd
	)		const

protected

Definition at line 297 of file downchannelizer.cpp.

Referenced by createFilterChain().

 {
     //qDebug("   testing signal [%f, %f], channel [%f, %f]", sigStart, sigEnd, chanStart, chanEnd);
     if(sigEnd <= sigStart)
         return false;
     if(chanEnd <= chanStart)
         return false;
     return (sigStart <= chanStart) && (sigEnd >= chanEnd);
 }

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◆ start()

void DownChannelizer::start ( )

virtual

Implements BasebandSampleSink.

Definition at line 109 of file downchannelizer.cpp.

References m_inputSampleRate, m_requestedCenterFrequency, m_requestedOutputSampleRate, m_sampleSink, and BasebandSampleSink::start().

 {
     if (m_sampleSink != 0)
     {
         qDebug() << "DownChannelizer::start: thread: " << thread()
                 << " m_inputSampleRate: " << m_inputSampleRate
                 << " m_requestedOutputSampleRate: " << m_requestedOutputSampleRate
                 << " m_requestedCenterFrequency: " << m_requestedCenterFrequency;
         m_sampleSink->start();
     }
 }

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◆ stop()

void DownChannelizer::stop ( )

virtual

Implements BasebandSampleSink.

Definition at line 121 of file downchannelizer.cpp.

References m_sampleSink, and BasebandSampleSink::stop().

 {
     if(m_sampleSink != 0)
         m_sampleSink->stop();
 }

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Member Data Documentation

◆ m_currentCenterFrequency

int DownChannelizer::m_currentCenterFrequency

protected

Definition at line 127 of file downchannelizer.h.

Referenced by applyConfiguration(), and applySetting().

◆ m_currentOutputSampleRate

int DownChannelizer::m_currentOutputSampleRate

protected

Definition at line 126 of file downchannelizer.h.

Referenced by applyConfiguration(), and applySetting().

◆ m_filterChainSetMode

bool DownChannelizer::m_filterChainSetMode

protected

Definition at line 121 of file downchannelizer.h.

Referenced by applyConfiguration(), applySetting(), and handleMessage().

◆ m_filterStages

FilterStages DownChannelizer::m_filterStages

protected

Definition at line 120 of file downchannelizer.h.

Referenced by applyConfiguration(), applySetting(), createFilterChain(), debugFilterChain(), feed(), freeFilterChain(), and setFilterChain().

◆ m_inputSampleRate

int DownChannelizer::m_inputSampleRate

protected

Definition at line 123 of file downchannelizer.h.

Referenced by applyConfiguration(), applySetting(), handleMessage(), and start().

◆ m_mutex

QMutex DownChannelizer::m_mutex

protected

Definition at line 129 of file downchannelizer.h.

Referenced by applyConfiguration(), applySetting(), and feed().

◆ m_requestedCenterFrequency

int DownChannelizer::m_requestedCenterFrequency

protected

Definition at line 125 of file downchannelizer.h.

Referenced by applyConfiguration(), applySetting(), handleMessage(), and start().

◆ m_requestedOutputSampleRate

int DownChannelizer::m_requestedOutputSampleRate

protected

Definition at line 124 of file downchannelizer.h.

Referenced by applyConfiguration(), applySetting(), handleMessage(), and start().

◆ m_sampleBuffer

SampleVector DownChannelizer::m_sampleBuffer

protected

Definition at line 128 of file downchannelizer.h.

Referenced by feed().

◆ m_sampleSink

BasebandSampleSink* DownChannelizer::m_sampleSink

protected

Demodulator.

Definition at line 122 of file downchannelizer.h.

Referenced by applyConfiguration(), applySetting(), feed(), handleMessage(), start(), and stop().

The documentation for this class was generated from the following files:

sdrbase/dsp/downchannelizer.h
sdrbase/dsp/downchannelizer.cpp

Classes

Signals

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ FilterStages

Constructor & Destructor Documentation

◆ DownChannelizer()

◆ ~DownChannelizer()

Member Function Documentation

◆ applyConfiguration()

◆ applySetting()

◆ configure()

◆ createFilterChain()

◆ debugFilterChain()

◆ feed()

◆ freeFilterChain()

◆ getInputSampleRate()

◆ getRequestedCenterFrequency()

◆ handleMessage()

◆ inputSampleRateChanged

◆ set()

◆ setFilterChain()

◆ signalContainsChannel()

◆ start()

◆ stop()

Member Data Documentation

◆ m_currentCenterFrequency

◆ m_currentOutputSampleRate

◆ m_filterChainSetMode

◆ m_filterStages

◆ m_inputSampleRate

◆ m_mutex

◆ m_requestedCenterFrequency

◆ m_requestedOutputSampleRate

◆ m_sampleBuffer

◆ m_sampleSink