kopia lustrzana https://github.com/f4exb/sdrangel
302 wiersze
9.6 KiB
C
302 wiersze
9.6 KiB
C
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2017 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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// //
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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 PLUGINS_CHANNELTX_MODATV_ATVMOD_H_
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#define PLUGINS_CHANNELTX_MODATV_ATVMOD_H_
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#include <QObject>
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#include <QMutex>
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#include <stdint.h>
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#include "dsp/basebandsamplesource.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 "util/message.h"
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class ATVMod : public BasebandSampleSource {
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Q_OBJECT
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public:
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typedef enum
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{
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ATVStdPAL625
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} ATVStd;
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typedef enum
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{
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ATVModInputUniform,
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ATVModInputBarChart,
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ATVModInputGradient
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} ATVModInput;
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ATVMod();
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~ATVMod();
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void configure(MessageQueue* messageQueue,
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Real rfBandwidth,
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ATVStd atvStd,
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ATVModInput atvModInput,
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Real uniformLevel,
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bool channelMute);
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virtual void pull(Sample& sample);
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virtual void pullAudio(int nbSamples); // this is used for video signal actually
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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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Real getMagSq() const { return m_movingAverage.average(); }
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static int getSampleRateMultiple(ATVStd std);
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signals:
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/**
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* Level changed
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* \param rmsLevel RMS level in range 0.0 - 1.0
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* \param peakLevel Peak level in range 0.0 - 1.0
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* \param numSamples Number of audio samples analyzed
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*/
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void levelChanged(qreal rmsLevel, qreal peakLevel, int numSamples);
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private:
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class MsgConfigureATVMod : public Message
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{
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MESSAGE_CLASS_DECLARATION
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public:
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Real getRFBandwidth() const { return m_rfBandwidth; }
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ATVStd getATVStd() const { return m_atvStd; }
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ATVModInput getATVModInput() const { return m_atvModInput; }
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Real getUniformLevel() const { return m_uniformLevel; }
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static MsgConfigureATVMod* create(
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Real rfBandwidth,
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ATVStd atvStd,
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ATVModInput atvModInput,
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Real uniformLevel)
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{
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return new MsgConfigureATVMod(rfBandwidth, atvStd, atvModInput, uniformLevel);
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}
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private:
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Real m_rfBandwidth;
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ATVStd m_atvStd;
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ATVModInput m_atvModInput;
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Real m_uniformLevel;
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MsgConfigureATVMod(
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Real rfBandwidth,
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ATVStd atvStd,
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ATVModInput atvModInput,
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Real uniformLevel) :
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Message(),
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m_rfBandwidth(rfBandwidth),
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m_atvStd(atvStd),
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m_atvModInput(atvModInput),
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m_uniformLevel(uniformLevel)
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{ }
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};
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struct Config
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{
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int m_outputSampleRate; //!< sample rate from channelizer
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qint64 m_inputFrequencyOffset; //!< offset from baseband center frequency
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Real m_rfBandwidth; //!< Bandwidth of modulated signal
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ATVStd m_atvStd; //!< Standard
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ATVModInput m_atvModInput; //!< Input source type
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Real m_uniformLevel; //!< Percentage between black and white for uniform screen display
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Config() :
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m_outputSampleRate(-1),
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m_inputFrequencyOffset(0),
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m_rfBandwidth(0),
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m_atvStd(ATVStdPAL625),
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m_atvModInput(ATVModInputBarChart),
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m_uniformLevel(0.5f)
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{ }
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};
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Config m_config;
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Config m_running;
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NCO m_carrierNco;
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Complex m_modSample;
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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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int m_tvSampleRate; //!< sample rate for generating signal
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uint32_t m_pointsPerSync; //!< number of line points for the horizontal sync
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uint32_t m_pointsPerBP; //!< number of line points for the back porch
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uint32_t m_pointsPerLine; //!< number of line points for the image line
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uint32_t m_pointsPerFP; //!< number of line points for the front porch
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uint32_t m_pointsPerFSync; //!< number of line points for the field first sync
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uint32_t m_pointsPerBar; //!< number of line points for a bar of the bar chart
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uint32_t m_pointsPerTU; //!< number of line points per time unit
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uint32_t m_nbLines; //!< number of lines per complete frame
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uint32_t m_nbHorizPoints; //!< number of line points per horizontal line
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bool m_interlaced; //!< true if image is interlaced (2 half frames per frame)
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bool m_evenImage;
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QMutex m_settingsMutex;
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int m_horizontalCount; //!< current point index on line
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int m_lineCount; //!< current line index in frame
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MovingAverage<Real> m_movingAverage;
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quint32 m_levelCalcCount;
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Real m_peakLevel;
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Real m_levelSum;
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static const float m_blackLevel;
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static const float m_spanLevel;
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static const int m_levelNbSamples;
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void apply(bool force = false);
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void pullFinalize(Complex& ci, Sample& sample);
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void pullVideo(Real& sample);
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void calculateLevel(Real& sample);
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void modulateSample();
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void applyStandard();
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inline void pullImageLine(Real& sample)
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{
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if (m_horizontalCount < m_pointsPerSync) // sync pulse
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{
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sample = 0.0f; // ultra-black
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}
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else if (m_horizontalCount < m_pointsPerSync + m_pointsPerBP) // back porch
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{
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sample = 0.3f; // black
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}
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else if (m_horizontalCount < m_pointsPerSync + m_pointsPerBP + m_pointsPerLine)
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{
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int pointIndex = m_horizontalCount - (m_pointsPerSync + m_pointsPerBP);
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switch(m_running.m_atvModInput)
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{
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case ATVModInputBarChart:
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sample = (pointIndex / m_pointsPerBar) * (m_spanLevel/5.0f) + m_blackLevel;
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break;
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case ATVModInputGradient:
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sample = (pointIndex / m_pointsPerLine) * m_spanLevel + m_blackLevel;
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break;
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case ATVModInputUniform:
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default:
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sample = m_spanLevel * m_running.m_uniformLevel + m_blackLevel;
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}
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}
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else // front porch
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{
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sample = m_blackLevel; // black
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}
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}
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inline void pullVSyncLine(int pointIndex, Real& sample)
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{
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switch (m_lineCount)
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{
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case 0: // __|__|
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case 1:
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case 313:
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case 314:
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{
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int halfIndex = m_horizontalCount % (m_nbHorizPoints/2);
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if (halfIndex < (m_nbHorizPoints/2) - m_pointsPerSync) // ultra-black
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{
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sample = 0.0f;
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}
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else // black
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{
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sample = m_blackLevel;
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}
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}
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break;
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case 2: // __||XX
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if (m_horizontalCount < (m_nbHorizPoints/2) - m_pointsPerSync)
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{
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sample = 0.0f;
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}
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else if (m_horizontalCount < (m_nbHorizPoints/2))
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{
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sample = m_blackLevel;
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}
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else if (m_horizontalCount < (m_nbHorizPoints/2) + m_pointsPerFSync)
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{
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sample = 0.0f;
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}
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else
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{
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sample = m_blackLevel;
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}
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break;
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case 3: // |XX|XX
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case 4:
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case 310:
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case 311:
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case 315:
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case 316:
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case 622:
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case 623:
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case 624:
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{
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int halfIndex = m_horizontalCount % (m_nbHorizPoints/2);
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if (halfIndex < m_pointsPerFSync) // ultra-black
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{
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sample = 0.0f;
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}
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else // black
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{
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sample = m_blackLevel;
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}
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}
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break;
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case 312: // |XX__|
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if (m_horizontalCount < m_pointsPerFSync)
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{
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sample = 0.0f;
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}
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else if (m_horizontalCount < (m_nbHorizPoints/2))
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{
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sample = m_blackLevel;
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}
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else if (m_horizontalCount < m_nbHorizPoints - m_pointsPerSync)
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{
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sample = 0.0f;
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}
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else
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{
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sample = m_blackLevel;
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}
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break;
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default: // black images
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if (m_horizontalCount < m_pointsPerSync)
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{
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sample = 0.0f;
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}
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else
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{
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sample = m_blackLevel;
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}
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break;
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}
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}
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};
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#endif /* PLUGINS_CHANNELTX_MODATV_ATVMOD_H_ */
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