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320 lines
11 KiB
C++
320 lines
11 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 Edouard Griffiths, F4EXB //
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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 INCLUDE_ATVDEMODSINK_H
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#define INCLUDE_ATVDEMODSINK_H
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#include <QElapsedTimer>
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#include <vector>
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#include <memory>
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#include "dsp/channelsamplesink.h"
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#include "dsp/basebandsamplesink.h"
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#include "dsp/nco.h"
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#include "dsp/interpolator.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/movingaverage.h"
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#include "gui/tvscreenanalog.h"
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#include "atvdemodsettings.h"
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class ATVDemodSink : public ChannelSampleSink {
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public:
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ATVDemodSink();
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~ATVDemodSink();
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
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void setScopeSink(BasebandSampleSink* scopeSink) { m_scopeSink = scopeSink; }
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void setTVScreen(TVScreenAnalog *tvScreen) //!< set by the GUI
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{
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m_registeredTVScreen = tvScreen;
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m_tvScreenBuffer = m_registeredTVScreen->getBackBuffer();
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}
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double getMagSq() const { return m_magSqAverage; } //!< Beware this is scaled to 2^30
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bool getBFOLocked();
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void setVideoTabIndex(int videoTabIndex) { m_videoTabIndex = videoTabIndex; }
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void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
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void applySettings(const ATVDemodSettings& settings, bool force = false);
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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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/**
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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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int m_channelSampleRate;
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int m_channelFrequencyOffset;
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int m_samplesPerLine; //!< number of samples per complete line (includes sync signals) - adusted value
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float m_samplesPerLineFrac; //!< number of samples per complete line (includes sync signals), fractional part
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ATVDemodSettings m_settings;
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int m_videoTabIndex;
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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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TVScreenAnalog *m_registeredTVScreen;
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TVScreenAnalogBuffer *m_tvScreenBuffer;
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//int m_intNumberSamplePerLine;
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int m_numberSamplesPerHTop; //!< number of samples per horizontal synchronization pulse (pulse in ultra-black) - integer value
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int m_numberOfBlackLines; //!< 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_firstVisibleLine;
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int m_fieldDetectStartPos;
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int m_fieldDetectEndPos;
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int m_vSyncDetectStartPos;
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int m_vSyncDetectEndPos;
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int m_vSyncDetectThreshold;
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int m_fieldDetectThreshold1;
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int m_fieldDetectThreshold2;
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int m_numberOfVSyncLines;
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int m_numberSamplesPerLineSignals; //!< number of samples in the non image part of the line (signals = front porch + pulse + back porch)
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int m_numberSamplesPerHSync; //!< number of samples per horizontal synchronization pattern (pulse + back porch)
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int m_numberSamplesHSyncCrop; //!< number of samples to crop from start of horizontal synchronization
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bool m_interleaved; //!< interleaved image
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//*************** PROCESSING ***************
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int m_fieldIndex;
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int m_synchroSamples;
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int m_fieldDetectSampleCount;
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int m_vSyncDetectSampleCount;
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float m_effMin;
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float m_effMax;
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float m_ampMin;
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float m_ampMax;
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float m_ampDelta; //!< calculated amplitude of HSync pulse (should be ~0.3f)
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float m_fltBufferI[6];
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float m_fltBufferQ[6];
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int m_amSampleIndex;
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int m_sampleOffset; // assumed (averaged) sample offset from the start of horizontal sync pulse
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float m_sampleOffsetFrac; // sample offset, fractional part
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int m_sampleOffsetDetected; // detected sample offset from the start of horizontal sync pulse
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int m_lineIndex;
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float m_hSyncShift;
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int m_hSyncErrorCount;
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float prevSample;
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int m_avgColIndex;
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SampleVector m_sampleBuffer;
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float m_sampleRangeCorrection;
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//*************** RF ***************
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MovingAverageUtil<double, double, 32> m_magSqAverage;
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MovingAverageUtilVar<double, double> m_ampAverage;
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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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// 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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void demod(Complex& c);
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void applyStandard(int sampleRate, ATVDemodSettings::ATVStd atvStd, float lineDuration);
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inline void processSample(float& sample, int& sampleVideo)
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{
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// Filling pixel on the current line - reference index 0 at start of sync pulse
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m_tvScreenBuffer->setSampleValue(m_sampleOffset - m_numberSamplesPerHSync, sampleVideo);
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if (m_settings.m_hSync)
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{
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// Horizontal Synchro detection
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if ((prevSample >= m_settings.m_levelSynchroTop &&
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sample < m_settings.m_levelSynchroTop) // horizontal synchro detected
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&& (m_sampleOffsetDetected > m_samplesPerLine - m_numberSamplesPerHTop))
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{
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float sampleOffsetDetectedFrac =
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(sample - m_settings.m_levelSynchroTop) / (prevSample - sample);
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float hSyncShift = -m_sampleOffset - m_sampleOffsetFrac - sampleOffsetDetectedFrac;
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if (hSyncShift > m_samplesPerLine / 2)
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hSyncShift -= m_samplesPerLine;
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else if (hSyncShift < -m_samplesPerLine / 2)
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hSyncShift += m_samplesPerLine;
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if (fabs(hSyncShift) > m_numberSamplesPerHTop)
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{
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m_hSyncErrorCount++;
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if (m_hSyncErrorCount >= 4)
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{
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// Fast sync: shift is too large, needs to be fixed ASAP
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m_hSyncShift = hSyncShift;
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m_hSyncErrorCount = 0;
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}
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}
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else
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{
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// Slow sync: slight adjustment is needed
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m_hSyncShift = hSyncShift * 0.2f;
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m_hSyncErrorCount = 0;
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}
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m_sampleOffsetDetected = 0;
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}
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else
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m_sampleOffsetDetected++;
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}
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m_sampleOffset++;
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if (m_settings.m_vSync)
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{
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if (m_sampleOffset > m_fieldDetectStartPos && m_sampleOffset < m_fieldDetectEndPos)
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m_fieldDetectSampleCount += sample < m_settings.m_levelSynchroTop;
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if (m_sampleOffset > m_vSyncDetectStartPos && m_sampleOffset < m_vSyncDetectEndPos)
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m_vSyncDetectSampleCount += sample < m_settings.m_levelSynchroTop;
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}
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// end of line
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if (m_sampleOffset >= m_samplesPerLine)
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{
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float sampleOffsetFloat = m_hSyncShift + m_sampleOffsetFrac - m_samplesPerLineFrac;
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m_sampleOffset = sampleOffsetFloat;
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m_sampleOffsetFrac = sampleOffsetFloat - m_sampleOffset;
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m_hSyncShift = 0.0f;
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m_lineIndex++;
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if (m_settings.m_atvStd == ATVDemodSettings::ATVStdHSkip) {
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processEOLHSkip();
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} else {
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processEOLClassic();
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}
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}
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prevSample = sample;
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}
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// Standard vertical sync
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inline void processEOLClassic()
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{
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if (m_lineIndex == m_numberOfVSyncLines + 3 && m_fieldIndex == 0)
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{
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m_tvScreenBuffer = m_registeredTVScreen->swapBuffers();
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}
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if (m_vSyncDetectSampleCount > m_vSyncDetectThreshold &&
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(m_lineIndex < 3 || m_lineIndex > m_numberOfVSyncLines + 1) && m_settings.m_vSync)
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{
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if (m_interleaved)
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{
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if (m_fieldDetectSampleCount > m_fieldDetectThreshold1)
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m_fieldIndex = 0;
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else if (m_fieldDetectSampleCount < m_fieldDetectThreshold2)
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m_fieldIndex = 1;
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}
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m_lineIndex = 2;
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}
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m_fieldDetectSampleCount = 0;
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m_vSyncDetectSampleCount = 0;
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if (m_lineIndex > m_settings.m_nbLines / 2 + m_fieldIndex && m_interleaved)
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{
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m_lineIndex = 1;
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m_fieldIndex = 1 - m_fieldIndex;
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}
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else if (m_lineIndex > m_settings.m_nbLines && !m_interleaved)
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{
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m_lineIndex = 1;
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m_fieldIndex = 0;
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}
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int rowIndex = m_lineIndex - m_firstVisibleLine;
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if (m_interleaved)
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rowIndex = rowIndex * 2 - m_fieldIndex;
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m_tvScreenBuffer->selectRow(rowIndex, m_sampleOffsetFrac);
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}
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// Vertical sync is obtained by skipping horizontal sync on the line that triggers vertical sync (new frame)
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inline void processEOLHSkip()
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{
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if ((m_sampleOffsetDetected > (3 * m_samplesPerLine) / 2) // Vertical sync is first horizontal sync after skip (count at least 1.5 line length)
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|| (!m_settings.m_vSync && (m_lineIndex >= m_settings.m_nbLines))) // Vsync ignored and reached nominal number of lines per frame
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{
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m_tvScreenBuffer = m_registeredTVScreen->swapBuffers();
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m_lineIndex = 0;
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}
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m_tvScreenBuffer->selectRow(m_lineIndex, m_sampleOffsetFrac);
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}
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};
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#endif // INCLUDE_ATVDEMODSINK_H
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