mirror of
https://github.com/f4exb/sdrangel.git
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684 lines
22 KiB
C++
684 lines
22 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2017 F4HKW //
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// for F4EXB / SDRAngel //
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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 INCLUDE_ATVDEMOD_H
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#define INCLUDE_ATVDEMOD_H
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#include <QMutex>
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#include <QElapsedTimer>
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#include <vector>
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#include "dsp/basebandsamplesink.h"
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#include "dsp/devicesamplesource.h"
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#include "dsp/dspcommands.h"
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#include "dsp/downchannelizer.h"
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#include "dsp/nco.h"
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#include "dsp/interpolator.h"
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#include "dsp/movingaverage.h"
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#include "dsp/fftfilt.h"
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#include "dsp/agc.h"
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#include "dsp/phaselock.h"
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#include "dsp/recursivefilters.h"
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#include "dsp/phasediscri.h"
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#include "audio/audiofifo.h"
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#include "util/message.h"
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#include "atvscreen.h"
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class DeviceSourceAPI;
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class ATVDemod : public BasebandSampleSink
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{
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Q_OBJECT
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public:
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enum ATVStd
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{
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ATVStdPAL625,
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ATVStdPAL525,
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ATVStd405,
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ATVStdShortInterleaved,
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ATVStdShort,
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ATVStdHSkip
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};
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enum ATVModulation {
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ATV_FM1, //!< Classical frequency modulation with discriminator #1
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ATV_FM2, //!< Classical frequency modulation with discriminator #2
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ATV_FM3, //!< Classical frequency modulation with phase derivative discriminator
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ATV_AM, //!< Classical amplitude modulation
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ATV_USB, //!< AM with vestigial lower side band (main signal is in the upper side)
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ATV_LSB //!< AM with vestigial upper side band (main signal is in the lower side)
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};
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struct ATVConfig
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{
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int m_intSampleRate;
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ATVStd m_enmATVStandard;
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int m_intNumberOfLines;
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float m_fltLineDuration;
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float m_fltTopDuration;
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float m_fltFramePerS;
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float m_fltRatioOfRowsToDisplay;
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float m_fltVoltLevelSynchroTop;
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float m_fltVoltLevelSynchroBlack;
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bool m_blnHSync;
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bool m_blnVSync;
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bool m_blnInvertVideo;
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int m_intVideoTabIndex;
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ATVConfig() :
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m_intSampleRate(0),
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m_enmATVStandard(ATVStdPAL625),
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m_intNumberOfLines(625),
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m_fltLineDuration(0.0f),
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m_fltTopDuration(0.0f),
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m_fltFramePerS(25.0f),
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m_fltRatioOfRowsToDisplay(0.0f),
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m_fltVoltLevelSynchroTop(0.0f),
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m_fltVoltLevelSynchroBlack(1.0f),
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m_blnHSync(false),
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m_blnVSync(false),
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m_blnInvertVideo(false),
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m_intVideoTabIndex(0)
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{
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}
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};
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struct ATVRFConfig
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{
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int64_t m_intFrequencyOffset;
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ATVModulation m_enmModulation;
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float m_fltRFBandwidth;
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float m_fltRFOppBandwidth;
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bool m_blnFFTFiltering;
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bool m_blndecimatorEnable;
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float m_fltBFOFrequency;
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float m_fmDeviation;
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ATVRFConfig() :
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m_intFrequencyOffset(0),
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m_enmModulation(ATV_FM1),
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m_fltRFBandwidth(0),
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m_fltRFOppBandwidth(0),
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m_blnFFTFiltering(false),
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m_blndecimatorEnable(false),
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m_fltBFOFrequency(0.0f),
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m_fmDeviation(1.0f)
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{
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}
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};
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class MsgReportEffectiveSampleRate : public Message
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{
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MESSAGE_CLASS_DECLARATION
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public:
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int getSampleRate() const { return m_sampleRate; }
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int getNbPointsPerLine() const { return m_nbPointsPerLine; }
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static MsgReportEffectiveSampleRate* create(int sampleRate, int nbPointsPerLine)
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{
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return new MsgReportEffectiveSampleRate(sampleRate, nbPointsPerLine);
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}
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protected:
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int m_sampleRate;
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int m_nbPointsPerLine;
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MsgReportEffectiveSampleRate(int sampleRate, int nbPointsPerLine) :
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Message(),
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m_sampleRate(sampleRate),
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m_nbPointsPerLine(nbPointsPerLine)
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{ }
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};
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ATVDemod(DeviceSourceAPI *deviceAPI);
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~ATVDemod();
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void setScopeSink(BasebandSampleSink* scopeSink) { m_scopeSink = scopeSink; }
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void configure(MessageQueue* objMessageQueue,
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float fltLineDurationUs,
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float fltTopDurationUs,
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float fltFramePerS,
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ATVStd enmATVStandard,
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int intNumberOfLines,
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float fltRatioOfRowsToDisplay,
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float fltVoltLevelSynchroTop,
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float fltVoltLevelSynchroBlack,
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bool blnHSync,
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bool blnVSync,
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bool blnInvertVideo,
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int intVideoTabIndex);
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void configureRF(MessageQueue* objMessageQueue,
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ATVModulation enmModulation,
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float fltRFBandwidth,
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float fltRFOppBandwidth,
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bool blnFFTFiltering,
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bool blndecimatorEnable,
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float fltBFOFrequency,
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float fmDeviation);
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool po);
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virtual void start();
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virtual void stop();
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virtual bool handleMessage(const Message& cmd);
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void setATVScreen(ATVScreen *objScreen);
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int getSampleRate();
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int getEffectiveSampleRate();
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double getMagSq() const { return m_objMagSqAverage.average(); } //!< Beware this is scaled to 2^30
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bool getBFOLocked();
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private:
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struct ATVConfigPrivate
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{
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int m_intTVSampleRate;
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int m_intNumberSamplePerLine;
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ATVConfigPrivate() :
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m_intTVSampleRate(0),
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m_intNumberSamplePerLine(0)
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{}
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};
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class MsgConfigureATVDemod : public Message
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{
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MESSAGE_CLASS_DECLARATION
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public:
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static MsgConfigureATVDemod* create(
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float fltLineDurationUs,
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float fltTopDurationUs,
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float fltFramePerS,
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ATVStd enmATVStandard,
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int intNumberOfLines,
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float fltRatioOfRowsToDisplay,
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float fltVoltLevelSynchroTop,
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float fltVoltLevelSynchroBlack,
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bool blnHSync,
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bool blnVSync,
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bool blnInvertVideo,
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int intVideoTabIndex)
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{
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return new MsgConfigureATVDemod(
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fltLineDurationUs,
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fltTopDurationUs,
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fltFramePerS,
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enmATVStandard,
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intNumberOfLines,
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fltRatioOfRowsToDisplay,
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fltVoltLevelSynchroTop,
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fltVoltLevelSynchroBlack,
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blnHSync,
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blnVSync,
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blnInvertVideo,
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intVideoTabIndex);
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}
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ATVConfig m_objMsgConfig;
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private:
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MsgConfigureATVDemod(
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float fltLineDurationUs,
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float fltTopDurationUs,
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float fltFramePerS,
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ATVStd enmATVStandard,
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int intNumberOfLines,
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float flatRatioOfRowsToDisplay,
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float fltVoltLevelSynchroTop,
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float fltVoltLevelSynchroBlack,
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bool blnHSync,
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bool blnVSync,
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bool blnInvertVideo,
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int intVideoTabIndex) :
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Message()
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{
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m_objMsgConfig.m_fltVoltLevelSynchroBlack = fltVoltLevelSynchroBlack;
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m_objMsgConfig.m_fltVoltLevelSynchroTop = fltVoltLevelSynchroTop;
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m_objMsgConfig.m_fltFramePerS = fltFramePerS;
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m_objMsgConfig.m_enmATVStandard = enmATVStandard;
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m_objMsgConfig.m_intNumberOfLines = intNumberOfLines;
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m_objMsgConfig.m_fltLineDuration = fltLineDurationUs;
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m_objMsgConfig.m_fltTopDuration = fltTopDurationUs;
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m_objMsgConfig.m_fltRatioOfRowsToDisplay = flatRatioOfRowsToDisplay;
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m_objMsgConfig.m_blnHSync = blnHSync;
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m_objMsgConfig.m_blnVSync = blnVSync;
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m_objMsgConfig.m_blnInvertVideo = blnInvertVideo;
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m_objMsgConfig.m_intVideoTabIndex = intVideoTabIndex;
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}
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};
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class MsgConfigureRFATVDemod : public Message
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{
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MESSAGE_CLASS_DECLARATION
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public:
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static MsgConfigureRFATVDemod* create(
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ATVModulation enmModulation,
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float fltRFBandwidth,
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float fltRFOppBandwidth,
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bool blnFFTFiltering,
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bool blndecimatorEnable,
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int intBFOFrequency,
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float fmDeviation)
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{
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return new MsgConfigureRFATVDemod(
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enmModulation,
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fltRFBandwidth,
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fltRFOppBandwidth,
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blnFFTFiltering,
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blndecimatorEnable,
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intBFOFrequency,
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fmDeviation);
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}
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ATVRFConfig m_objMsgConfig;
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private:
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MsgConfigureRFATVDemod(
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ATVModulation enmModulation,
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float fltRFBandwidth,
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float fltRFOppBandwidth,
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bool blnFFTFiltering,
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bool blndecimatorEnable,
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float fltBFOFrequency,
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float fmDeviation) :
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Message()
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{
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m_objMsgConfig.m_enmModulation = enmModulation;
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m_objMsgConfig.m_fltRFBandwidth = fltRFBandwidth;
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m_objMsgConfig.m_fltRFOppBandwidth = fltRFOppBandwidth;
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m_objMsgConfig.m_blnFFTFiltering = blnFFTFiltering;
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m_objMsgConfig.m_blndecimatorEnable = blndecimatorEnable;
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m_objMsgConfig.m_fltBFOFrequency = fltBFOFrequency;
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m_objMsgConfig.m_fmDeviation = fmDeviation;
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}
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};
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/**
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* Exponential average using integers and alpha as the inverse of a power of two
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*/
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class AvgExpInt
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{
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public:
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AvgExpInt(int log2Alpha) : m_log2Alpha(log2Alpha), m_m1(0), m_start(true) {}
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void reset() { m_start = true; }
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int run(int m0)
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{
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if (m_start)
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{
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m_m1 = m0;
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m_start = false;
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return m0;
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}
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else
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{
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m_m1 = m0 + m_m1 - (m_m1>>m_log2Alpha);
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return m_m1>>m_log2Alpha;
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}
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}
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private:
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int m_log2Alpha;
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int m_m1;
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bool m_start;
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};
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DeviceSourceAPI* m_deviceAPI;
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//*************** SCOPE ***************
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BasebandSampleSink* m_scopeSink;
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SampleVector m_scopeSampleBuffer;
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//*************** ATV PARAMETERS ***************
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ATVScreen * m_registeredATVScreen;
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//int m_intNumberSamplePerLine;
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int m_intNumberSamplePerTop;
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int m_intNumberOfLines;
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int m_intNumberOfSyncLines; //!< this is the number of non displayable lines at the start of a frame. First displayable row comes next.
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int m_intNumberOfBlackLines; //!< this is the total number of lines not part of the image and is used for vertical screen size
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int m_intNumberOfEqLines; //!< number of equalizing lines both whole and partial
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int m_intNumberSamplePerLineSignals; //!< number of samples in the non image part of the line (signals)
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int m_intNumberSaplesPerHSync; //!< number of samples per horizontal synchronization pattern (pulse + back porch)
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bool m_interleaved; //!< interleaved image
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//*************** PROCESSING ***************
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int m_intImageIndex;
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int m_intSynchroPoints;
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bool m_blnSynchroDetected;
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bool m_blnVerticalSynchroDetected;
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float m_fltAmpLineAverage;
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float m_fltEffMin;
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float m_fltEffMax;
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float m_fltAmpMin;
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float m_fltAmpMax;
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float m_fltAmpDelta;
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float m_fltBufferI[6];
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float m_fltBufferQ[6];
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int m_intColIndex;
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int m_intSampleIndex;
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int m_intRowIndex;
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int m_intLineIndex;
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AvgExpInt m_objAvgColIndex;
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int m_intAvgColIndex;
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SampleVector m_sampleBuffer;
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//*************** RF ***************
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MovingAverage<double> m_objMagSqAverage;
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NCO m_nco;
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SimplePhaseLock m_bfoPLL;
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SecondOrderRecursiveFilter m_bfoFilter;
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// Interpolator group for decimation and/or double sideband RF filtering
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Interpolator m_interpolator;
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Real m_interpolatorDistance;
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Real m_interpolatorDistanceRemain;
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// Used for vestigial SSB with asymmetrical filtering (needs double sideband scheme)
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fftfilt* m_DSBFilter;
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Complex* m_DSBFilterBuffer;
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int m_DSBFilterBufferIndex;
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static const int m_ssbFftLen;
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// Used for FM
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PhaseDiscriminators m_objPhaseDiscri;
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//QElapsedTimer m_objTimer;
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ATVConfig m_running;
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ATVConfig m_config;
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ATVRFConfig m_rfRunning;
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ATVRFConfig m_rfConfig;
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ATVConfigPrivate m_runningPrivate;
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ATVConfigPrivate m_configPrivate;
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QMutex m_objSettingsMutex;
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void applySettings();
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void applyStandard();
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void demod(Complex& c);
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static float getRFBandwidthDivisor(ATVModulation modulation);
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inline void processHSkip(float& fltVal, int& intVal)
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{
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m_registeredATVScreen->setDataColor(m_intColIndex - m_intNumberSaplesPerHSync + m_intNumberSamplePerTop, intVal, intVal, intVal);
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// Horizontal Synchro detection
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// Floor Detection 0
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if (fltVal < m_running.m_fltVoltLevelSynchroTop)
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{
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m_intSynchroPoints++;
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}
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// Black detection 0.3
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else if (fltVal > m_running.m_fltVoltLevelSynchroBlack)
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{
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m_intSynchroPoints = 0;
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}
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// sync pulse
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m_blnSynchroDetected = (m_intSynchroPoints == m_intNumberSamplePerTop);
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if (m_blnSynchroDetected)
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{
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if (m_intSampleIndex >= (3 * m_runningPrivate.m_intNumberSamplePerLine)/2) // first after skip
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{
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//qDebug("VSync: %d %d %d", m_intColIndex, m_intSampleIndex, m_intLineIndex);
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m_intAvgColIndex = m_intColIndex;
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m_registeredATVScreen->renderImage(0);
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m_intImageIndex++;
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m_intLineIndex = 0;
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m_intRowIndex = 0;
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}
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m_intSampleIndex = 0;
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}
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else
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{
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m_intSampleIndex++;
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}
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if (m_intColIndex < m_runningPrivate.m_intNumberSamplePerLine + m_intNumberSamplePerTop - 1)
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{
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m_intColIndex++;
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}
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else
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{
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if (m_running.m_blnHSync && (m_intLineIndex == 0))
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{
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//qDebug("HCorr: %d", m_intAvgColIndex);
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m_intColIndex = m_intNumberSamplePerTop + (m_runningPrivate.m_intNumberSamplePerLine - m_intAvgColIndex)/2; // amortizing factor 1/2
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}
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else
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{
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m_intColIndex = m_intNumberSamplePerTop;
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}
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if ((m_rfRunning.m_enmModulation == ATV_AM)
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|| (m_rfRunning.m_enmModulation == ATV_USB)
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|| (m_rfRunning.m_enmModulation == ATV_LSB))
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{
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m_fltAmpMin = m_fltEffMin;
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m_fltAmpMax = m_fltEffMax;
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m_fltAmpDelta = m_fltEffMax-m_fltEffMin;
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if(m_fltAmpDelta<=0.0)
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{
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m_fltAmpDelta=1.0f;
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}
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//Reset extrema
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m_fltEffMin = 2000000.0f;
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m_fltEffMax = -2000000.0f;
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}
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m_registeredATVScreen->selectRow(m_intRowIndex);
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m_intLineIndex++;
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m_intRowIndex++;
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}
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}
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inline void processClassic(float& fltVal, int& intVal)
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{
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int intSynchroTimeSamples= (3 * m_runningPrivate.m_intNumberSamplePerLine)/4;
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float fltSynchroTrameLevel = 0.5f*((float)intSynchroTimeSamples) * m_running.m_fltVoltLevelSynchroBlack;
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// Horizontal Synchro detection
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// Floor Detection 0
|
|
if (fltVal < m_running.m_fltVoltLevelSynchroTop)
|
|
{
|
|
m_intSynchroPoints++;
|
|
}
|
|
// Black detection 0.3
|
|
else if (fltVal > m_running.m_fltVoltLevelSynchroBlack)
|
|
{
|
|
m_intSynchroPoints = 0;
|
|
}
|
|
|
|
m_blnSynchroDetected = (m_intSynchroPoints == m_intNumberSamplePerTop);
|
|
|
|
//Horizontal Synchro processing
|
|
|
|
bool blnNewLine = false;
|
|
|
|
if (m_blnSynchroDetected)
|
|
{
|
|
m_intAvgColIndex = m_intSampleIndex - m_intColIndex - (m_intColIndex < m_runningPrivate.m_intNumberSamplePerLine/2 ? 150 : 0);
|
|
//qDebug("HSync: %d %d %d", m_intSampleIndex, m_intColIndex, m_intAvgColIndex);
|
|
m_intSampleIndex = 0;
|
|
}
|
|
else
|
|
{
|
|
m_intSampleIndex++;
|
|
}
|
|
|
|
if (!m_running.m_blnHSync && (m_intColIndex >= m_runningPrivate.m_intNumberSamplePerLine)) // H Sync not active
|
|
{
|
|
m_intColIndex = 0;
|
|
blnNewLine = true;
|
|
}
|
|
else if (m_intColIndex >= m_runningPrivate.m_intNumberSamplePerLine + m_intNumberSamplePerTop) // No valid H sync
|
|
{
|
|
if (m_running.m_blnHSync && (m_intLineIndex == 0))
|
|
{
|
|
//qDebug("HSync: %d %d", m_intColIndex, m_intAvgColIndex);
|
|
m_intColIndex = m_intNumberSamplePerTop + m_intAvgColIndex/4; // amortizing 1/4
|
|
}
|
|
else
|
|
{
|
|
m_intColIndex = m_intNumberSamplePerTop;
|
|
}
|
|
|
|
blnNewLine = true;
|
|
}
|
|
|
|
if (blnNewLine)
|
|
{
|
|
if ((m_rfRunning.m_enmModulation == ATV_AM)
|
|
|| (m_rfRunning.m_enmModulation == ATV_USB)
|
|
|| (m_rfRunning.m_enmModulation == ATV_LSB))
|
|
{
|
|
m_fltAmpMin = m_fltEffMin;
|
|
m_fltAmpMax = m_fltEffMax;
|
|
m_fltAmpDelta = m_fltEffMax-m_fltEffMin;
|
|
|
|
if(m_fltAmpDelta<=0.0)
|
|
{
|
|
m_fltAmpDelta=1.0f;
|
|
}
|
|
|
|
//Reset extrema
|
|
m_fltEffMin = 2000000.0f;
|
|
m_fltEffMax = -2000000.0f;
|
|
}
|
|
|
|
m_fltAmpLineAverage=0.0f;
|
|
|
|
//New line + Interleaving
|
|
m_intRowIndex += m_interleaved ? 2 : 1;
|
|
|
|
if (m_intRowIndex < m_intNumberOfLines)
|
|
{
|
|
m_registeredATVScreen->selectRow(m_intRowIndex - m_intNumberOfSyncLines);
|
|
}
|
|
|
|
m_intLineIndex++;
|
|
}
|
|
|
|
// Filling pixels
|
|
|
|
// +4 is to compensate shift due to hsync amortizing factor of 1/4
|
|
m_registeredATVScreen->setDataColor(m_intColIndex - m_intNumberSaplesPerHSync + m_intNumberSamplePerTop + 4, intVal, intVal, intVal);
|
|
m_intColIndex++;
|
|
|
|
// Vertical sync and image rendering
|
|
|
|
if ((m_running.m_blnVSync) && (m_intLineIndex < m_intNumberOfLines)) // VSync activated and lines in range
|
|
{
|
|
if (m_intColIndex >= intSynchroTimeSamples)
|
|
{
|
|
if (m_fltAmpLineAverage <= fltSynchroTrameLevel)
|
|
{
|
|
m_fltAmpLineAverage = 0.0f;
|
|
|
|
if (!m_blnVerticalSynchroDetected) // not yet
|
|
{
|
|
m_blnVerticalSynchroDetected = true; // prevent repetition
|
|
|
|
if ((m_intLineIndex % 2 == 0) || !m_interleaved) // even => odd image
|
|
{
|
|
m_registeredATVScreen->renderImage(0);
|
|
m_intRowIndex = 1;
|
|
}
|
|
else
|
|
{
|
|
m_intRowIndex = 0;
|
|
}
|
|
|
|
m_registeredATVScreen->selectRow(m_intRowIndex - m_intNumberOfSyncLines);
|
|
m_intLineIndex = 0;
|
|
m_intImageIndex++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_blnVerticalSynchroDetected = false; // reset
|
|
}
|
|
}
|
|
}
|
|
else // no VSync or lines out of range => arbitrary
|
|
{
|
|
if (m_intLineIndex >= m_intNumberOfLines/2)
|
|
{
|
|
if (m_intImageIndex % 2 == 1) // odd image
|
|
{
|
|
m_registeredATVScreen->renderImage(0);
|
|
|
|
if (m_rfRunning.m_enmModulation == ATV_AM)
|
|
{
|
|
m_fltAmpMin = m_fltEffMin;
|
|
m_fltAmpMax = m_fltEffMax;
|
|
m_fltAmpDelta = m_fltEffMax-m_fltEffMin;
|
|
|
|
if(m_fltAmpDelta<=0.0)
|
|
{
|
|
m_fltAmpDelta=1.0f;
|
|
}
|
|
|
|
//Reset extrema
|
|
m_fltEffMin = 2000000.0f;
|
|
m_fltEffMax = -2000000.0f;
|
|
}
|
|
|
|
m_intRowIndex = 1;
|
|
}
|
|
else
|
|
{
|
|
m_intRowIndex = 0;
|
|
}
|
|
|
|
m_registeredATVScreen->selectRow(m_intRowIndex - m_intNumberOfSyncLines);
|
|
m_intLineIndex = 0;
|
|
m_intImageIndex++;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
#endif // INCLUDE_ATVDEMOD_H
|