///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017 Edouard Griffiths, F4EXB                                   //
//                                                                               //
// This program is free software; you can redistribute it and/or modify          //
// it under the terms of the GNU General Public License as published by          //
// the Free Software Foundation as version 3 of the License, or                  //
//                                                                               //
// This program is distributed in the hope that it will be useful,               //
// but WITHOUT ANY WARRANTY; without even the implied warranty of                //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  //
// GNU General Public License V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
///////////////////////////////////////////////////////////////////////////////////

#ifndef PLUGINS_CHANNELTX_MODATV_ATVMOD_H_
#define PLUGINS_CHANNELTX_MODATV_ATVMOD_H_

#include <QObject>
#include <QMutex>

#include <vector>

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

#include <stdint.h>

#include "dsp/basebandsamplesource.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/movingaverage.h"
#include "dsp/fftfilt.h"
#include "util/message.h"

class ATVMod : public BasebandSampleSource {
    Q_OBJECT

public:
    typedef enum
    {
        ATVStdPAL625,
		ATVStdPAL525,
		ATVStd525L20F,
		ATVStd405
    } ATVStd;

    typedef enum
    {
        ATVModInputUniform,
        ATVModInputHBars,
        ATVModInputVBars,
        ATVModInputChessboard,
        ATVModInputHGradient,
        ATVModInputVGradient,
        ATVModInputImage,
        ATVModInputVideo,
		ATVModInputCamera
    } ATVModInput;

    typedef enum
    {
    	ATVModulationAM,
		ATVModulationFM,
		ATVModulationUSB,
		ATVModulationLSB,
        ATVModulationVestigialUSB,
        ATVModulationVestigialLSB
    } ATVModulation;

    class MsgConfigureImageFileName : public Message
    {
        MESSAGE_CLASS_DECLARATION

    public:
        const QString& getFileName() const { return m_fileName; }

        static MsgConfigureImageFileName* create(const QString& fileName)
        {
            return new MsgConfigureImageFileName(fileName);
        }

    private:
        QString m_fileName;

        MsgConfigureImageFileName(const QString& fileName) :
            Message(),
            m_fileName(fileName)
        { }
    };

    class MsgConfigureVideoFileName : public Message
    {
        MESSAGE_CLASS_DECLARATION

    public:
        const QString& getFileName() const { return m_fileName; }

        static MsgConfigureVideoFileName* create(const QString& fileName)
        {
            return new MsgConfigureVideoFileName(fileName);
        }

    private:
        QString m_fileName;

        MsgConfigureVideoFileName(const QString& fileName) :
            Message(),
            m_fileName(fileName)
        { }
    };

    class MsgConfigureVideoFileSourceSeek : public Message
    {
        MESSAGE_CLASS_DECLARATION

    public:
        int getPercentage() const { return m_seekPercentage; }

        static MsgConfigureVideoFileSourceSeek* create(int seekPercentage)
        {
            return new MsgConfigureVideoFileSourceSeek(seekPercentage);
        }

    protected:
        int m_seekPercentage; //!< percentage of seek position from the beginning 0..100

        MsgConfigureVideoFileSourceSeek(int seekPercentage) :
            Message(),
            m_seekPercentage(seekPercentage)
        { }
    };

    class MsgConfigureVideoFileSourceStreamTiming : public Message {
        MESSAGE_CLASS_DECLARATION

    public:

        static MsgConfigureVideoFileSourceStreamTiming* create()
        {
            return new MsgConfigureVideoFileSourceStreamTiming();
        }

    private:

        MsgConfigureVideoFileSourceStreamTiming() :
            Message()
        { }
    };

    class MsgReportVideoFileSourceStreamTiming : public Message
    {
        MESSAGE_CLASS_DECLARATION

    public:
        int getFrameCount() const { return m_frameCount; }

        static MsgReportVideoFileSourceStreamTiming* create(int frameCount)
        {
            return new MsgReportVideoFileSourceStreamTiming(frameCount);
        }

    protected:
        int m_frameCount;

        MsgReportVideoFileSourceStreamTiming(int frameCount) :
            Message(),
            m_frameCount(frameCount)
        { }
    };

    class MsgReportVideoFileSourceStreamData : public Message {
        MESSAGE_CLASS_DECLARATION

    public:
        int getFrameRate() const { return m_frameRate; }
        quint32 getVideoLength() const { return m_videoLength; }

        static MsgReportVideoFileSourceStreamData* create(int frameRate,
                quint32 recordLength)
        {
            return new MsgReportVideoFileSourceStreamData(frameRate, recordLength);
        }

    protected:
        int m_frameRate;
        int m_videoLength; //!< Video length in frames

        MsgReportVideoFileSourceStreamData(int frameRate,
                int videoLength) :
            Message(),
            m_frameRate(frameRate),
            m_videoLength(videoLength)
        { }
    };

    class MsgConfigureCameraIndex : public Message
    {
        MESSAGE_CLASS_DECLARATION

    public:
        int getIndex() const { return m_index; }

        static MsgConfigureCameraIndex* create(int index)
        {
            return new MsgConfigureCameraIndex(index);
        }

    private:
        int m_index;

        MsgConfigureCameraIndex(int index) :
            Message(),
			m_index(index)
        { }
    };

    class MsgReportCameraData : public Message {
        MESSAGE_CLASS_DECLARATION

    public:
        int getdeviceNumber() const { return m_deviceNumber; }
        float getFPS() const { return m_fps; }
        int getWidth() const { return m_width; }
        int getHeight() const { return m_height; }
        int getStatus() const { return m_status; }

        static MsgReportCameraData* create(
        		int deviceNumber,
				float fps,
				int width,
				int height,
				int status)
        {
            return new MsgReportCameraData(
            		deviceNumber,
					fps,
					width,
					height,
					status);
        }

    protected:
        int m_deviceNumber;
        float m_fps;
        int m_width;
        int m_height;
        int m_status;

        MsgReportCameraData(
        		int deviceNumber,
        		float fps,
				int width,
				int height,
				int status) :
            Message(),
			m_deviceNumber(deviceNumber),
			m_fps(fps),
			m_width(width),
			m_height(height),
			m_status(status)
        { }
    };

    class MsgConfigureOverlayText : public Message
    {
        MESSAGE_CLASS_DECLARATION

    public:
        const QString& getOverlayText() const { return m_overlayText; }

        static MsgConfigureOverlayText* create(const QString& overlayText)
        {
            return new MsgConfigureOverlayText(overlayText);
        }

    private:
        QString m_overlayText;

        MsgConfigureOverlayText(const QString& overlayText) :
            Message(),
            m_overlayText(overlayText)
        { }
    };

    class MsgConfigureShowOverlayText : public Message
    {
        MESSAGE_CLASS_DECLARATION

    public:
        bool getShowOverlayText() const { return m_showOverlayText; }

        static MsgConfigureShowOverlayText* create(bool showOverlayText)
        {
            return new MsgConfigureShowOverlayText(showOverlayText);
        }

    private:
        bool m_showOverlayText;

        MsgConfigureShowOverlayText(bool showOverlayText) :
            Message(),
            m_showOverlayText(showOverlayText)
        { }
    };

    class MsgReportEffectiveSampleRate : public Message
    {
        MESSAGE_CLASS_DECLARATION

    public:
        int getSampleRate() const { return m_sampleRate; }

        static MsgReportEffectiveSampleRate* create(int sampleRate)
        {
            return new MsgReportEffectiveSampleRate(sampleRate);
        }

    protected:
        int m_sampleRate;

        MsgReportEffectiveSampleRate(int sampleRate) :
            Message(),
            m_sampleRate(sampleRate)
        { }
    };

    ATVMod();
    ~ATVMod();

    void configure(MessageQueue* messageQueue,
            Real rfBandwidth,
            Real rfOppBandwidth,
            ATVStd atvStd,
            int nbLines,
            int fps,
            ATVModInput atvModInput,
            Real uniformLevel,
			ATVModulation atvModulation,
			bool videoPlayLoop,
			bool videoPlay,
			bool cameraPLay,
            bool channelMute,
            bool invertedVideo,
            float rfScaling,
            float fmExcursion);

    virtual void pull(Sample& sample);
    virtual void pullAudio(int nbSamples); // this is used for video signal actually
    virtual void start();
    virtual void stop();
    virtual bool handleMessage(const Message& cmd);

    int getEffectiveSampleRate() const { return m_tvSampleRate; };
    Real getMagSq() const { return m_movingAverage.average(); }
    void getCameraNumbers(std::vector<int>& numbers);

    static void getBaseValues(int linesPerSecond, int& sampleRateUnits, int& nbPointsPerRateUnit);
    static float getRFBandwidthDivisor(ATVModulation modulation);

signals:
    /**
     * Level changed
     * \param rmsLevel RMS level in range 0.0 - 1.0
     * \param peakLevel Peak level in range 0.0 - 1.0
     * \param numSamples Number of audio samples analyzed
     */
    void levelChanged(qreal rmsLevel, qreal peakLevel, int numSamples);

private:
    class MsgConfigureATVMod : public Message
    {
        MESSAGE_CLASS_DECLARATION

    public:
        Real getRFBandwidth() const { return m_rfBandwidth; }
        Real getRFOppBandwidth() const { return m_rfOppBandwidth; }
        ATVStd getATVStd() const { return m_atvStd; }
        ATVModInput getATVModInput() const { return m_atvModInput; }
        int getNbLines() const { return m_nbLines; }
        int getFPS() const { return m_fps; }
        Real getUniformLevel() const { return m_uniformLevel; }
        ATVModulation getModulation() const { return m_atvModulation; }
        bool getVideoPlayLoop() const { return m_videoPlayLoop; }
        bool getVideoPlay() const { return m_videoPlay; }
        bool getCameraPlay() const { return m_cameraPlay; }
        bool getChannelMute() const { return m_channelMute; }
        bool getInvertedVideo() const { return m_invertedVideo; }
        float getRFScaling() const { return m_rfScaling; }
        float getFMExcursion() const { return m_fmExcursion; }

        static MsgConfigureATVMod* create(
            Real rfBandwidth,
            Real rfOppBandwidth,
            ATVStd atvStd,
            int nbLines,
            int fps,
            ATVModInput atvModInput,
            Real uniformLevel,
			ATVModulation atvModulation,
			bool videoPlayLoop,
			bool videoPlay,
			bool cameraPlay,
			bool channelMute,
			bool invertedVideo,
			float rfScaling,
			float fmExcursion)
        {
            return new MsgConfigureATVMod(
                    rfBandwidth,
                    rfOppBandwidth,
                    atvStd,
                    nbLines,
                    fps,
                    atvModInput,
                    uniformLevel,
                    atvModulation,
                    videoPlayLoop,
                    videoPlay,
                    cameraPlay,
					channelMute,
					invertedVideo,
					rfScaling,
					fmExcursion);
        }

    private:
        Real          m_rfBandwidth;
        Real          m_rfOppBandwidth;
        ATVStd        m_atvStd;
        int           m_nbLines;
        int           m_fps;
        ATVModInput   m_atvModInput;
        Real          m_uniformLevel;
        ATVModulation m_atvModulation;
        bool          m_videoPlayLoop;
        bool          m_videoPlay;
        bool          m_cameraPlay;
        bool          m_channelMute;
        bool          m_invertedVideo;
        float         m_rfScaling;
        float         m_fmExcursion;

        MsgConfigureATVMod(
                Real rfBandwidth,
                Real rfOppBandwidth,
                ATVStd atvStd,
                int nbLines,
                int fps,
                ATVModInput atvModInput,
                Real uniformLevel,
				ATVModulation atvModulation,
				bool videoPlayLoop,
				bool videoPlay,
				bool cameraPlay,
				bool channelMute,
				bool invertedVideo,
				float rfScaling,
				float fmExcursion) :
            Message(),
            m_rfBandwidth(rfBandwidth),
            m_rfOppBandwidth(rfOppBandwidth),
            m_atvStd(atvStd),
            m_nbLines(nbLines),
            m_fps(fps),
            m_atvModInput(atvModInput),
            m_uniformLevel(uniformLevel),
			m_atvModulation(atvModulation),
			m_videoPlayLoop(videoPlayLoop),
			m_videoPlay(videoPlay),
			m_cameraPlay(cameraPlay),
			m_channelMute(channelMute),
			m_invertedVideo(invertedVideo),
			m_rfScaling(rfScaling),
			m_fmExcursion(fmExcursion)
        { }
    };

    struct ATVCamera
    {
    	cv::VideoCapture m_camera;    //!< camera object
        cv::Mat m_videoframeOriginal; //!< camera non resized image
        cv::Mat m_videoFrame;         //!< displayable camera frame
    	int m_cameraNumber;           //!< camera device number
        float m_videoFPS;             //!< camera FPS rate
        int m_videoWidth;             //!< camera frame width
        int m_videoHeight;            //!< camera frame height
        float m_videoFx;              //!< camera horizontal scaling factor
        float m_videoFy;              //!< camera vertictal scaling factor
        float m_videoFPSq;            //!< camera FPS sacaling factor
        float m_videoFPSCount;        //!< camera FPS fractional counter
        int m_videoPrevFPSCount;      //!< camera FPS previous integer counter

        ATVCamera() :
        	m_cameraNumber(-1),
			m_videoFPS(25.0f),
        	m_videoWidth(1),
			m_videoHeight(1),
			m_videoFx(1.0f),
			m_videoFy(1.0f),
			m_videoFPSq(1.0f),
		    m_videoFPSCount(0.0f),
		    m_videoPrevFPSCount(0)
        {}
    };

    struct Config
    {
        int           m_outputSampleRate;     //!< sample rate from channelizer
        qint64        m_inputFrequencyOffset; //!< offset from baseband center frequency
        Real          m_rfBandwidth;          //!< Bandwidth of modulated signal or direct sideband for SSB / vestigial SSB
        Real          m_rfOppBandwidth;       //!< Bandwidth of opposite sideband for vestigial SSB
        ATVStd        m_atvStd;               //!< Standard
        int           m_nbLines;              //!< Number of lines per full frame
        int           m_fps;                  //!< Number of frames per second
        ATVModInput   m_atvModInput;          //!< Input source type
        Real          m_uniformLevel;         //!< Percentage between black and white for uniform screen display
        ATVModulation m_atvModulation;        //!< RF modulation type
        bool          m_videoPlayLoop;        //!< Play video in a loop
        bool          m_videoPlay;            //!< True to play video and false to pause
        bool          m_cameraPlay;           //!< True to play camera video and false to pause
        bool          m_channelMute;          //!< Mute channel baseband output
        bool          m_invertedVideo;        //!< True if video signal is inverted before modulation
        float         m_rfScalingFactor;      //!< Scaling factor from +/-1 to +/-2^15
        float         m_fmExcursion;          //!< FM excursion factor relative to full bandwidth

        Config() :
            m_outputSampleRate(-1),
            m_inputFrequencyOffset(0),
            m_rfBandwidth(0),
            m_rfOppBandwidth(0),
            m_atvStd(ATVStdPAL625),
            m_nbLines(625),
            m_fps(25),
            m_atvModInput(ATVModInputHBars),
            m_uniformLevel(0.5f),
			m_atvModulation(ATVModulationAM),
			m_videoPlayLoop(false),
			m_videoPlay(false),
			m_cameraPlay(false),
			m_channelMute(false),
			m_invertedVideo(false),
			m_rfScalingFactor(29204.0f), // -1dB
            m_fmExcursion(0.5f)          // half bandwidth
        { }
    };

    Config m_config;
    Config m_running;

    NCO m_carrierNco;
    Complex m_modSample;
    float m_modPhasor; //!< For FM modulation
    Interpolator m_interpolator;
    Real m_interpolatorDistance;
    Real m_interpolatorDistanceRemain;
    int      m_tvSampleRate;     //!< sample rate for generating signal
    uint32_t m_pointsPerSync;    //!< number of line points for the horizontal sync
    uint32_t m_pointsPerBP;      //!< number of line points for the back porch
    uint32_t m_pointsPerImgLine; //!< number of line points for the image line
    uint32_t m_pointsPerFP;      //!< number of line points for the front porch
    uint32_t m_pointsPerFSync;   //!< number of line points for the field first sync
    uint32_t m_pointsPerHBar;    //!< number of line points for a bar of the bar chart
    uint32_t m_linesPerVBar;     //!< number of lines for a bar of the bar chart
    uint32_t m_pointsPerTU;      //!< number of line points per time unit
    uint32_t m_nbLines;          //!< number of lines per complete frame
    uint32_t m_nbLines2;         //!< same number as above (non interlaced) or half the number above (interlaced)
    uint32_t m_nbImageLines;     //!< number of image lines excluding synchronization lines
    uint32_t m_nbImageLines2;    //!< same number as above (non interlaced) or half the number above (interlaced)
    uint32_t m_nbHorizPoints;    //!< number of line points per horizontal line
    uint32_t m_nbSyncLinesHead;  //!< number of header sync lines
    uint32_t m_nbBlankLines;     //!< number of lines in a frame (full or half) that are blanked (black) at the top of the image
    float    m_hBarIncrement;    //!< video level increment at each horizontal bar increment
    float    m_vBarIncrement;    //!< video level increment at each vertical bar increment
    bool     m_interlaced;       //!< true if image is interlaced (2 half frames per frame)
    bool     m_evenImage;        //!< in interlaced mode true if this is an even image
    QMutex   m_settingsMutex;
    int      m_horizontalCount;  //!< current point index on line
    int      m_lineCount;        //!< current line index in frame
    float    m_fps;              //!< resulting frames per second

    MovingAverage<Real> m_movingAverage;
    quint32 m_levelCalcCount;
    Real m_peakLevel;
    Real m_levelSum;

    cv::Mat m_imageFromFile;     //!< original image not resized not overlaid by text
    cv::Mat m_imageOriginal;     //!< original not resized image
    cv::Mat m_image;             //!< resized image for transmission at given rate
    bool m_imageOK;

    cv::VideoCapture m_video;    //!< current video capture
    cv::Mat m_videoframeOriginal; //!< current frame from video
    cv::Mat m_videoFrame;        //!< current displayable video frame
    float m_videoFPS;            //!< current video FPS rate
    int m_videoWidth;            //!< current video frame width
    int m_videoHeight;           //!< current video frame height
    float m_videoFx;             //!< current video horizontal scaling factor
    float m_videoFy;             //!< current video vertictal scaling factor
    float m_videoFPSq;           //!< current video FPS sacaling factor
    float m_videoFPSCount;       //!< current video FPS fractional counter
    int m_videoPrevFPSCount;     //!< current video FPS previous integer counter
    int m_videoLength;           //!< current video length in frames
    bool m_videoEOF;             //!< current video has reached end of file
    bool m_videoOK;

    std::vector<ATVCamera> m_cameras; //!< vector of available cameras
    int m_cameraIndex;           //!< curent camera index in list of available cameras

    std::string m_overlayText;
    bool m_showOverlayText;

    // Used for standard SSB
    fftfilt* m_SSBFilter;
    Complex* m_SSBFilterBuffer;
    int m_SSBFilterBufferIndex;

    // Used for vestigial SSB with asymmetrical filtering (needs double sideband scheme)
    fftfilt* m_DSBFilter;
    Complex* m_DSBFilterBuffer;
    int m_DSBFilterBufferIndex;

    static const int m_ssbFftLen;

    static const float m_blackLevel;
    static const float m_spanLevel;
    static const int m_levelNbSamples;
    static const int m_nbBars; //!< number of bars in bar or chessboard patterns
    static const int m_cameraFPSTestNbFrames; //!< number of frames for camera FPS test

    void apply(bool force = false);
    void pullFinalize(Complex& ci, Sample& sample);
    void pullVideo(Real& sample);
    void calculateLevel(Real& sample);
    void modulateSample();
    Complex& modulateSSB(Real& sample);
    Complex& modulateVestigialSSB(Real& sample);
    void applyStandard();
    void openImage(const QString& fileName);
    void openVideo(const QString& fileName);
    void resizeImage();
    void calculateVideoSizes();
    void resizeVideo();
    void seekVideoFileStream(int seekPercentage);
    void scanCameras();
    void releaseCameras();
    void calculateCamerasSizes();
    void resizeCameras();
    void resizeCamera();
    void mixImageAndText(cv::Mat& image);

    inline void pullImageLine(Real& sample)
    {
        if (m_horizontalCount < m_pointsPerSync) // sync pulse
        {
            sample = 0.0f; // ultra-black
        }
        else if (m_horizontalCount < m_pointsPerSync + m_pointsPerBP) // back porch
        {
            sample = m_blackLevel; // black
        }
        else if (m_horizontalCount < m_pointsPerSync + m_pointsPerBP + m_pointsPerImgLine)
        {
            int pointIndex = m_horizontalCount - (m_pointsPerSync + m_pointsPerBP);
            int iLine = m_lineCount % m_nbLines2;
            int oddity = m_lineCount < m_nbLines2 ? 0 : 1;
            int iLineImage = iLine - m_nbSyncLinesHead - m_nbBlankLines;

            switch(m_running.m_atvModInput)
            {
            case ATVModInputHBars:
                sample = (pointIndex / m_pointsPerHBar) * m_hBarIncrement + m_blackLevel;
                break;
            case ATVModInputVBars:
                sample = (iLine / m_linesPerVBar) * m_vBarIncrement + m_blackLevel;
                break;
            case ATVModInputChessboard:
                sample = (((iLine / m_linesPerVBar)*5 + (pointIndex / m_pointsPerHBar)) % 2) * m_spanLevel * m_running.m_uniformLevel + m_blackLevel;
                break;
            case ATVModInputHGradient:
                sample = (pointIndex / (float) m_pointsPerImgLine) * m_spanLevel + m_blackLevel;
                break;
            case ATVModInputVGradient:
                sample = ((iLine -5) / (float) m_nbImageLines2) * m_spanLevel + m_blackLevel;
                break;
            case ATVModInputImage:
                if (!m_imageOK || (iLineImage < -oddity) || m_image.empty())
                {
                    sample = m_spanLevel * m_running.m_uniformLevel + m_blackLevel;
                }
                else
                {
                	unsigned char pixv;

                	if (m_interlaced) {
                        pixv = m_image.at<unsigned char>(2*iLineImage + oddity, pointIndex); // row (y), col (x)
                	} else {
                        pixv = m_image.at<unsigned char>(iLineImage, pointIndex); // row (y), col (x)
                	}

                    sample = (pixv / 256.0f) * m_spanLevel + m_blackLevel;
                }
                break;
            case ATVModInputVideo:
                if (!m_videoOK || (iLineImage < -oddity) || m_videoFrame.empty())
                {
                    sample = m_spanLevel * m_running.m_uniformLevel + m_blackLevel;
                }
                else
                {
                	unsigned char pixv;

                	if (m_interlaced) {
                        pixv = m_videoFrame.at<unsigned char>(2*iLineImage + oddity, pointIndex); // row (y), col (x)
                	} else {
                        pixv = m_videoFrame.at<unsigned char>(iLineImage, pointIndex); // row (y), col (x)
                	}

                    sample = (pixv / 256.0f) * m_spanLevel + m_blackLevel;
                }
            	break;
            case ATVModInputCamera:
                if ((iLineImage < -oddity) || (m_cameraIndex < 0))
                {
                    sample = m_spanLevel * m_running.m_uniformLevel + m_blackLevel;
                }
                else
                {
                    ATVCamera& camera = m_cameras[m_cameraIndex];

                    if (camera.m_videoFrame.empty())
                    {
                        sample = m_spanLevel * m_running.m_uniformLevel + m_blackLevel;
                    }
                    else
                    {
                        unsigned char pixv;

                        if (m_interlaced) {
                            pixv = camera.m_videoFrame.at<unsigned char>(2*iLineImage + oddity, pointIndex); // row (y), col (x)
                        } else {
                            pixv = camera.m_videoFrame.at<unsigned char>(iLineImage, pointIndex); // row (y), col (x)
                        }

                        sample = (pixv / 256.0f) * m_spanLevel + m_blackLevel;
                    }
                }
                break;
            case ATVModInputUniform:
            default:
                sample = m_spanLevel * m_running.m_uniformLevel + m_blackLevel;
            }
        }
        else // front porch
        {
            sample = m_blackLevel; // black
        }
    }

    inline void pullVSyncLine(Real& sample)
    {
        int fieldLine = m_lineCount % m_nbLines2;

        if (m_lineCount < m_nbLines2) // even
        {
            if (fieldLine < 2) // 0,1: Whole line "long" pulses
            {
                int halfIndex = m_horizontalCount % (m_nbHorizPoints/2);

                if (halfIndex < (m_nbHorizPoints/2) - m_pointsPerSync) // ultra-black
                {
                    sample = 0.0f;
                }
                else // black
                {
                    sample = m_blackLevel;
                }
            }
            else if (fieldLine == 2) // long pulse then equalizing pulse
            {
                if (m_horizontalCount < (m_nbHorizPoints/2) - m_pointsPerSync)
                {
                    sample = 0.0f; // ultra-black
                }
                else if (m_horizontalCount < (m_nbHorizPoints/2))
                {
                    sample = m_blackLevel; // black
                }
                else if (m_horizontalCount < (m_nbHorizPoints/2) + m_pointsPerFSync)
                {
                    sample = 0.0f; // ultra-black
                }
                else
                {
                    sample = m_blackLevel; // black
                }
            }
            else if ((fieldLine < 5) || (fieldLine > m_nbLines2 - 3)) // Whole line equalizing pulses
            {
                int halfIndex = m_horizontalCount % (m_nbHorizPoints/2);

                if (halfIndex < m_pointsPerFSync) // ultra-black
                {
                    sample = 0.0f;
                }
                else // black
                {
                    sample = m_blackLevel;
                }
            }
            else // black images
            {
                if (m_horizontalCount < m_pointsPerSync)
                {
                    sample = 0.0f;
                }
                else
                {
                    sample = m_blackLevel;
                }
            }
        }
        else // odd
        {
            if (fieldLine < 1) // equalizing pulse then long pulse
            {
                if (m_horizontalCount < m_pointsPerFSync)
                {
                    sample = 0.0f; // ultra-black
                }
                else if (m_horizontalCount < (m_nbHorizPoints/2))
                {
                    sample = m_blackLevel; // black
                }
                else if (m_horizontalCount < m_nbHorizPoints - m_pointsPerSync)
                {
                    sample = 0.0f; // ultra-black
                }
                else
                {
                    sample = m_blackLevel; // black
                }
            }
            else if (fieldLine < 3) // Whole line "long" pulses
            {
                int halfIndex = m_horizontalCount % (m_nbHorizPoints/2);

                if (halfIndex < (m_nbHorizPoints/2) - m_pointsPerSync) // ultra-black
                {
                    sample = 0.0f;
                }
                else // black
                {
                    sample = m_blackLevel;
                }
            }
            else if ((fieldLine < 5) || (fieldLine > m_nbLines2 - 5)) // Whole line equalizing pulses
            {
                int halfIndex = m_horizontalCount % (m_nbHorizPoints/2);

                if (halfIndex < m_pointsPerFSync) // ultra-black
                {
                    sample = 0.0f;
                }
                else // black
                {
                    sample = m_blackLevel;
                }
            }
            else // black images
            {
                if (m_horizontalCount < m_pointsPerSync)
                {
                    sample = 0.0f;
                }
                else
                {
                    sample = m_blackLevel;
                }
            }
        }
    }
};


#endif /* PLUGINS_CHANNELTX_MODATV_ATVMOD_H_ */