# All files / src/utils cea-608-parser.js

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     /**
     *
     * This code was ported from the dash.js project at:
     *   https://github.com/Dash-Industry-Forum/dash.js/blob/development/externals/cea608-parser.js
     *   https://github.com/Dash-Industry-Forum/dash.js/commit/8269b26a761e0853bb21d78780ed945144ecdd4d#diff-71bc295a2d6b6b7093a1d3290d53a4b2
     *
     * The original copyright appears below:
     *
     * The copyright in this software is being made available under the BSD License,
     * included below. This software may be subject to other third party and contributor
     * rights, including patent rights, and no such rights are granted under this license.
     *
     * Copyright (c) 2015-2016, DASH Industry Forum.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without modification,
     * are permitted provided that the following conditions are met:
     *  1. Redistributions of source code must retain the above copyright notice, this
     *  list of conditions and the following disclaimer.
     *  * Redistributions in binary form must reproduce the above copyright notice,
     *  this list of conditions and the following disclaimer in the documentation and/or
     *  other materials provided with the distribution.
     *  2. Neither the name of Dash Industry Forum nor the names of its
     *  contributors may be used to endorse or promote products derived from this software
     *  without specific prior written permission.
     *
     *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
     *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     *  POSSIBILITY OF SUCH DAMAGE.
     */
    /**
         *  Exceptions from regular ASCII. CodePoints are mapped to UTF-16 codes
         */

    let specialCea608CharsCodes = {
      0x2a: 0xe1, // lowercase a, acute accent
      0x5c: 0xe9, // lowercase e, acute accent
      0x5e: 0xed, // lowercase i, acute accent
      0x5f: 0xf3, // lowercase o, acute accent
      0x60: 0xfa, // lowercase u, acute accent
      0x7b: 0xe7, // lowercase c with cedilla
      0x7c: 0xf7, // division symbol
      0x7d: 0xd1, // uppercase N tilde
      0x7e: 0xf1, // lowercase n tilde
      0x7f: 0x2588, // Full block
      // THIS BLOCK INCLUDES THE 16 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
      // THAT COME FROM HI BYTE=0x11 AND LOW BETWEEN 0x30 AND 0x3F
      // THIS MEANS THAT \x50 MUST BE ADDED TO THE VALUES
      0x80: 0xae, // Registered symbol (R)
      0x81: 0xb0, // degree sign
      0x82: 0xbd, // 1/2 symbol
      0x83: 0xbf, // Inverted (open) question mark
      0x84: 0x2122, // Trademark symbol (TM)
      0x85: 0xa2, // Cents symbol
      0x86: 0xa3, // Pounds sterling
      0x87: 0x266a, // Music 8'th note
      0x88: 0xe0, // lowercase a, grave accent
      0x89: 0x20, // transparent space (regular)
      0x8a: 0xe8, // lowercase e, grave accent
      0x8b: 0xe2, // lowercase a, circumflex accent
      0x8c: 0xea, // lowercase e, circumflex accent
      0x8d: 0xee, // lowercase i, circumflex accent
      0x8e: 0xf4, // lowercase o, circumflex accent
      0x8f: 0xfb, // lowercase u, circumflex accent
      // THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
      // THAT COME FROM HI BYTE=0x12 AND LOW BETWEEN 0x20 AND 0x3F
      0x90: 0xc1, // capital letter A with acute
      0x91: 0xc9, // capital letter E with acute
      0x92: 0xd3, // capital letter O with acute
      0x93: 0xda, // capital letter U with acute
      0x94: 0xdc, // capital letter U with diaresis
      0x95: 0xfc, // lowercase letter U with diaeresis
      0x96: 0x2018, // opening single quote
      0x97: 0xa1, // inverted exclamation mark
      0x98: 0x2a, // asterisk
      0x99: 0x2019, // closing single quote
      0x9a: 0x2501, // box drawings heavy horizontal
      0x9b: 0xa9, // copyright sign
      0x9c: 0x2120, // Service mark
      0x9d: 0x2022, // (round) bullet
      0x9e: 0x201c, // Left double quotation mark
      0x9f: 0x201d, // Right double quotation mark
      0xa0: 0xc0, // uppercase A, grave accent
      0xa1: 0xc2, // uppercase A, circumflex
      0xa2: 0xc7, // uppercase C with cedilla
      0xa3: 0xc8, // uppercase E, grave accent
      0xa4: 0xca, // uppercase E, circumflex
      0xa5: 0xcb, // capital letter E with diaresis
      0xa6: 0xeb, // lowercase letter e with diaresis
      0xa7: 0xce, // uppercase I, circumflex
      0xa8: 0xcf, // uppercase I, with diaresis
      0xa9: 0xef, // lowercase i, with diaresis
      0xaa: 0xd4, // uppercase O, circumflex
      0xab: 0xd9, // uppercase U, grave accent
      0xac: 0xf9, // lowercase u, grave accent
      0xad: 0xdb, // uppercase U, circumflex
      0xae: 0xab, // left-pointing double angle quotation mark
      0xaf: 0xbb, // right-pointing double angle quotation mark
      // THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
      // THAT COME FROM HI BYTE=0x13 AND LOW BETWEEN 0x20 AND 0x3F
      0xb0: 0xc3, // Uppercase A, tilde
      0xb1: 0xe3, // Lowercase a, tilde
      0xb2: 0xcd, // Uppercase I, acute accent
      0xb3: 0xcc, // Uppercase I, grave accent
      0xb4: 0xec, // Lowercase i, grave accent
      0xb5: 0xd2, // Uppercase O, grave accent
      0xb6: 0xf2, // Lowercase o, grave accent
      0xb7: 0xd5, // Uppercase O, tilde
      0xb8: 0xf5, // Lowercase o, tilde
      0xb9: 0x7b, // Open curly brace
      0xba: 0x7d, // Closing curly brace
      0xbb: 0x5c, // Backslash
      0xbc: 0x5e, // Caret
      0xbd: 0x5f, // Underscore
      0xbe: 0x7c, // Pipe (vertical line)
      0xbf: 0x223c, // Tilde operator
      0xc0: 0xc4, // Uppercase A, umlaut
      0xc1: 0xe4, // Lowercase A, umlaut
      0xc2: 0xd6, // Uppercase O, umlaut
      0xc3: 0xf6, // Lowercase o, umlaut
      0xc4: 0xdf, // Esszett (sharp S)
      0xc5: 0xa5, // Yen symbol
      0xc6: 0xa4, // Generic currency sign
      0xc7: 0x2503, // Box drawings heavy vertical
      0xc8: 0xc5, // Uppercase A, ring
      0xc9: 0xe5, // Lowercase A, ring
      0xca: 0xd8, // Uppercase O, stroke
      0xcb: 0xf8, // Lowercase o, strok
      0xcc: 0x250f, // Box drawings heavy down and right
      0xcd: 0x2513, // Box drawings heavy down and left
      0xce: 0x2517, // Box drawings heavy up and right
      0xcf: 0x251b // Box drawings heavy up and left
    };

    /**
     * Utils
     */
    let getCharForByte = function (byte) {
      let charCode = byte;
      if (specialCea608CharsCodes.hasOwnProperty(byte)) {
        charCode = specialCea608CharsCodes[byte];
      }

      return String.fromCharCode(charCode);
    };

    let NR_ROWS = 15,
      NR_COLS = 100;
    // Tables to look up row from PAC data
    let rowsLowCh1 = { 0x11: 1, 0x12: 3, 0x15: 5, 0x16: 7, 0x17: 9, 0x10: 11, 0x13: 12, 0x14: 14 };
    let rowsHighCh1 = { 0x11: 2, 0x12: 4, 0x15: 6, 0x16: 8, 0x17: 10, 0x13: 13, 0x14: 15 };
    let rowsLowCh2 = { 0x19: 1, 0x1A: 3, 0x1D: 5, 0x1E: 7, 0x1F: 9, 0x18: 11, 0x1B: 12, 0x1C: 14 };
    let rowsHighCh2 = { 0x19: 2, 0x1A: 4, 0x1D: 6, 0x1E: 8, 0x1F: 10, 0x1B: 13, 0x1C: 15 };

    let backgroundColors = ['white', 'green', 'blue', 'cyan', 'red', 'yellow', 'magenta', 'black', 'transparent'];

    /**
     * Simple logger class to be able to write with time-stamps and filter on level.
     */
    let logger = {
      verboseFilter: { 'DATA': 3, 'DEBUG': 3, 'INFO': 2, 'WARNING': 2, 'TEXT': 1, 'ERROR': 0 },
      time: null,
      verboseLevel: 0, // Only write errors
      setTime: function (newTime) {
        this.time = newTime;
      },
      log: function (severity, msg) {
        let minLevel = this.verboseFilter[severity];
        if (this.verboseLevel >= minLevel) {
          // console.log(this.time + ' [' + severity + '] ' + msg);
        }
      }
    };

    let numArrayToHexArray = function (numArray) {
      let hexArray = [];
      for (let j = 0; j < numArray.length; j++) {
        hexArray.push(numArray[j].toString(16));
      }

      return hexArray;
    };

    class PenState {
      constructor (foreground, underline, italics, background, flash) {
        this.foreground = foreground || 'white';
        this.underline = underline || false;
        this.italics = italics || false;
        this.background = background || 'black';
        this.flash = flash || false;
      }

      reset () {
        this.foreground = 'white';
        this.underline = false;
        this.italics = false;
        this.background = 'black';
        this.flash = false;
      }

      setStyles (styles) {
        let attribs = ['foreground', 'underline', 'italics', 'background', 'flash'];
        for (let i = 0; i < attribs.length; i++) {
          let style = attribs[i];
          if (styles.hasOwnProperty(style)) {
            this[style] = styles[style];
          }
        }
      }

      isDefault () {
        return (this.foreground === 'white' && !this.underline && !this.italics &&
                    this.background === 'black' && !this.flash);
      }

      equals (other) {
        return ((this.foreground === other.foreground) &&
                     (this.underline === other.underline) &&
                     (this.italics === other.italics) &&
                     (this.background === other.background) &&
                     (this.flash === other.flash));
      }

      copy (newPenState) {
        this.foreground = newPenState.foreground;
        this.underline = newPenState.underline;
        this.italics = newPenState.italics;
        this.background = newPenState.background;
        this.flash = newPenState.flash;
      }

      toString () {
        return ('color=' + this.foreground + ', underline=' + this.underline + ', italics=' + this.italics +
                ', background=' + this.background + ', flash=' + this.flash);
      }
    }

    /**
     * Unicode character with styling and background.
     * @constructor
     */
    class StyledUnicodeChar {
      constructor (uchar, foreground, underline, italics, background, flash) {
        this.uchar = uchar || ' '; // unicode character
        this.penState = new PenState(foreground, underline, italics, background, flash);
      }

      reset () {
        this.uchar = ' ';
        this.penState.reset();
      }

      setChar (uchar, newPenState) {
        this.uchar = uchar;
        this.penState.copy(newPenState);
      }

      setPenState (newPenState) {
        this.penState.copy(newPenState);
      }

      equals (other) {
        return this.uchar === other.uchar && this.penState.equals(other.penState);
      }

      copy (newChar) {
        this.uchar = newChar.uchar;
        this.penState.copy(newChar.penState);
      }

      isEmpty () {
        return this.uchar === ' ' && this.penState.isDefault();
      }
    }

    /**
     * CEA-608 row consisting of NR_COLS instances of StyledUnicodeChar.
     * @constructor
     */
    class Row {
      constructor () {
        this.chars = [];
        for (let i = 0; i < NR_COLS; i++) {
          this.chars.push(new StyledUnicodeChar());
        }

        this.pos = 0;
        this.currPenState = new PenState();
      }

      equals (other) {
        let equal = true;
        for (let i = 0; i < NR_COLS; i++) {
          if (!this.chars[i].equals(other.chars[i])) {
            equal = false;
            break;
          }
        }
        return equal;
      }

      copy (other) {
        for (let i = 0; i < NR_COLS; i++) {
          this.chars[i].copy(other.chars[i]);
        }
      }

      isEmpty () {
        let empty = true;
        for (let i = 0; i < NR_COLS; i++) {
          if (!this.chars[i].isEmpty()) {
            empty = false;
            break;
          }
        }
        return empty;
      }

      /**
         *  Set the cursor to a valid column.
         */
      setCursor (absPos) {
        if (this.pos !== absPos) {
          this.pos = absPos;
        }

        if (this.pos < 0) {
          logger.log('ERROR', 'Negative cursor position ' + this.pos);
          this.pos = 0;
        } else if (this.pos > NR_COLS) {
          logger.log('ERROR', 'Too large cursor position ' + this.pos);
          this.pos = NR_COLS;
        }
      }

      /**
         * Move the cursor relative to current position.
         */
      moveCursor (relPos) {
        let newPos = this.pos + relPos;
        if (relPos > 1) {
          for (let i = this.pos + 1; i < newPos + 1; i++) {
            this.chars[i].setPenState(this.currPenState);
          }
        }
        this.setCursor(newPos);
      }

      /**
         * Backspace, move one step back and clear character.
         */
      backSpace () {
        this.moveCursor(-1);
        this.chars[this.pos].setChar(' ', this.currPenState);
      }

      insertChar (byte) {
        if (byte >= 0x90) { // Extended char
          this.backSpace();
        }
        let char = getCharForByte(byte);
        if (this.pos >= NR_COLS) {
          logger.log('ERROR', 'Cannot insert ' + byte.toString(16) +
                            ' (' + char + ') at position ' + this.pos + '. Skipping it!');
          return;
        }
        this.chars[this.pos].setChar(char, this.currPenState);
        this.moveCursor(1);
      }

      clearFromPos (startPos) {
        let i;
        for (i = startPos; i < NR_COLS; i++) {
          this.chars[i].reset();
        }
      }

      clear () {
        this.clearFromPos(0);
        this.pos = 0;
        this.currPenState.reset();
      }

      clearToEndOfRow () {
        this.clearFromPos(this.pos);
      }

      getTextString () {
        let chars = [];
        let empty = true;
        for (let i = 0; i < NR_COLS; i++) {
          let char = this.chars[i].uchar;
          if (char !== ' ') {
            empty = false;
          }

          chars.push(char);
        }
        if (empty) {
          return '';
        } else {
          return chars.join('');
        }
      }

      setPenStyles (styles) {
        this.currPenState.setStyles(styles);
        let currChar = this.chars[this.pos];
        currChar.setPenState(this.currPenState);
      }
    }

    /**
     * Keep a CEA-608 screen of 32x15 styled characters
     * @constructor
    */
    class CaptionScreen {
      constructor () {
        this.rows = [];
        for (let i = 0; i < NR_ROWS; i++) {
          this.rows.push(new Row());
        } // Note that we use zero-based numbering (0-14)

        this.currRow = NR_ROWS - 1;
        this.nrRollUpRows = null;
        this.reset();
      }

      reset () {
        for (let i = 0; i < NR_ROWS; i++) {
          this.rows[i].clear();
        }

        this.currRow = NR_ROWS - 1;
      }

      equals (other) {
        let equal = true;
        for (let i = 0; i < NR_ROWS; i++) {
          if (!this.rows[i].equals(other.rows[i])) {
            equal = false;
            break;
          }
        }
        return equal;
      }

      copy (other) {
        for (let i = 0; i < NR_ROWS; i++) {
          this.rows[i].copy(other.rows[i]);
        }
      }

      isEmpty () {
        let empty = true;
        for (let i = 0; i < NR_ROWS; i++) {
          if (!this.rows[i].isEmpty()) {
            empty = false;
            break;
          }
        }
        return empty;
      }

      backSpace () {
        let row = this.rows[this.currRow];
        row.backSpace();
      }

      clearToEndOfRow () {
        let row = this.rows[this.currRow];
        row.clearToEndOfRow();
      }

      /**
         * Insert a character (without styling) in the current row.
         */
      insertChar (char) {
        let row = this.rows[this.currRow];
        row.insertChar(char);
      }

      setPen (styles) {
        let row = this.rows[this.currRow];
        row.setPenStyles(styles);
      }

      moveCursor (relPos) {
        let row = this.rows[this.currRow];
        row.moveCursor(relPos);
      }

      setCursor (absPos) {
        logger.log('INFO', 'setCursor: ' + absPos);
        let row = this.rows[this.currRow];
        row.setCursor(absPos);
      }

      setPAC (pacData) {
        logger.log('INFO', 'pacData = ' + JSON.stringify(pacData));
        let newRow = pacData.row - 1;
        if (this.nrRollUpRows && newRow < this.nrRollUpRows - 1) {
          newRow = this.nrRollUpRows - 1;
        }

        // Make sure this only affects Roll-up Captions by checking this.nrRollUpRows
        if (this.nrRollUpRows && this.currRow !== newRow) {
          // clear all rows first
          for (let i = 0; i < NR_ROWS; i++) {
            this.rows[i].clear();
          }

          // Copy this.nrRollUpRows rows from lastOutputScreen and place it in the newRow location
          // topRowIndex - the start of rows to copy (inclusive index)
          let topRowIndex = this.currRow + 1 - (this.nrRollUpRows);
          // We only copy if the last position was already shown.
          // We use the cueStartTime value to check this.
          const lastOutputScreen = this.lastOutputScreen;
          if (lastOutputScreen) {
            let prevLineTime = lastOutputScreen.rows[topRowIndex].cueStartTime;
            if (prevLineTime && prevLineTime < logger.time) {
              for (let i = 0; i < this.nrRollUpRows; i++) {
                this.rows[newRow - this.nrRollUpRows + i + 1].copy(lastOutputScreen.rows[topRowIndex + i]);
              }
            }
          }
        }

        this.currRow = newRow;
        let row = this.rows[this.currRow];
        if (pacData.indent !== null) {
          let indent = pacData.indent;
          let prevPos = Math.max(indent - 1, 0);
          row.setCursor(pacData.indent);
          pacData.color = row.chars[prevPos].penState.foreground;
        }
        let styles = { foreground: pacData.color, underline: pacData.underline, italics: pacData.italics, background: 'black', flash: false };
        this.setPen(styles);
      }

      /**
         * Set background/extra foreground, but first do back_space, and then insert space (backwards compatibility).
         */
      setBkgData (bkgData) {
        logger.log('INFO', 'bkgData = ' + JSON.stringify(bkgData));
        this.backSpace();
        this.setPen(bkgData);
        this.insertChar(0x20); // Space
      }

      setRollUpRows (nrRows) {
        this.nrRollUpRows = nrRows;
      }

      rollUp () {
        if (this.nrRollUpRows === null) {
          logger.log('DEBUG', 'roll_up but nrRollUpRows not set yet');
          return; // Not properly setup
        }
        logger.log('TEXT', this.getDisplayText());
        let topRowIndex = this.currRow + 1 - this.nrRollUpRows;
        let topRow = this.rows.splice(topRowIndex, 1)[0];
        topRow.clear();
        this.rows.splice(this.currRow, 0, topRow);
        logger.log('INFO', 'Rolling up');
        // logger.log('TEXT', this.get_display_text())
      }

      /**
        * Get all non-empty rows with as unicode text.
        */
      getDisplayText (asOneRow) {
        asOneRow = asOneRow || false;
        let displayText = [];
        let text = '';
        let rowNr = -1;
        for (let i = 0; i < NR_ROWS; i++) {
          let rowText = this.rows[i].getTextString();
          if (rowText) {
            rowNr = i + 1;
            if (asOneRow) {
              displayText.push('Row ' + rowNr + ': \'' + rowText + '\'');
            } else {
              displayText.push(rowText.trim());
            }
          }
        }
        if (displayText.length > 0) {
          if (asOneRow) {
            text = '[' + displayText.join(' | ') + ']';
          } else {
            text = displayText.join('\n');
          }
        }
        return text;
      }

      getTextAndFormat () {
        return this.rows;
      }
    }

    // var modes = ['MODE_ROLL-UP', 'MODE_POP-ON', 'MODE_PAINT-ON', 'MODE_TEXT'];

    class Cea608Channel {
      constructor (channelNumber, outputFilter) {
        this.chNr = channelNumber;
        this.outputFilter = outputFilter;
        this.mode = null;
        this.verbose = 0;
        this.displayedMemory = new CaptionScreen();
        this.nonDisplayedMemory = new CaptionScreen();
        this.lastOutputScreen = new CaptionScreen();
        this.currRollUpRow = this.displayedMemory.rows[NR_ROWS - 1];
        this.writeScreen = this.displayedMemory;
        this.mode = null;
        this.cueStartTime = null; // Keeps track of where a cue started.
      }

      reset () {
        this.mode = null;
        this.displayedMemory.reset();
        this.nonDisplayedMemory.reset();
        this.lastOutputScreen.reset();
        this.currRollUpRow = this.displayedMemory.rows[NR_ROWS - 1];
        this.writeScreen = this.displayedMemory;
        this.mode = null;
        this.cueStartTime = null;
        this.lastCueEndTime = null;
      }

      getHandler () {
        return this.outputFilter;
      }

      setHandler (newHandler) {
        this.outputFilter = newHandler;
      }

      setPAC (pacData) {
        this.writeScreen.setPAC(pacData);
      }

      setBkgData (bkgData) {
        this.writeScreen.setBkgData(bkgData);
      }

      setMode (newMode) {
        if (newMode === this.mode) {
          return;
        }

        this.mode = newMode;
        logger.log('INFO', 'MODE=' + newMode);
        if (this.mode === 'MODE_POP-ON') {
          this.writeScreen = this.nonDisplayedMemory;
        } else {
          this.writeScreen = this.displayedMemory;
          this.writeScreen.reset();
        }
        if (this.mode !== 'MODE_ROLL-UP') {
          this.displayedMemory.nrRollUpRows = null;
          this.nonDisplayedMemory.nrRollUpRows = null;
        }
        this.mode = newMode;
      }

      insertChars (chars) {
        for (let i = 0; i < chars.length; i++) {
          this.writeScreen.insertChar(chars[i]);
        }

        let screen = this.writeScreen === this.displayedMemory ? 'DISP' : 'NON_DISP';
        logger.log('INFO', screen + ': ' + this.writeScreen.getDisplayText(true));
        if (this.mode === 'MODE_PAINT-ON' || this.mode === 'MODE_ROLL-UP') {
          logger.log('TEXT', 'DISPLAYED: ' + this.displayedMemory.getDisplayText(true));
          this.outputDataUpdate();
        }
      }

      ccRCL () { // Resume Caption Loading (switch mode to Pop On)
        logger.log('INFO', 'RCL - Resume Caption Loading');
        this.setMode('MODE_POP-ON');
      }

      ccBS () { // BackSpace
        logger.log('INFO', 'BS - BackSpace');
        if (this.mode === 'MODE_TEXT') {
          return;
        }

        this.writeScreen.backSpace();
        if (this.writeScreen === this.displayedMemory) {
          this.outputDataUpdate();
        }
      }

      ccAOF () { // Reserved (formerly Alarm Off)

      }

      ccAON () { // Reserved (formerly Alarm On)

      }

      ccDER () { // Delete to End of Row
        logger.log('INFO', 'DER- Delete to End of Row');
        this.writeScreen.clearToEndOfRow();
        this.outputDataUpdate();
      }

      ccRU (nrRows) { // Roll-Up Captions-2,3,or 4 Rows
        logger.log('INFO', 'RU(' + nrRows + ') - Roll Up');
        this.writeScreen = this.displayedMemory;
        this.setMode('MODE_ROLL-UP');
        this.writeScreen.setRollUpRows(nrRows);
      }

      ccFON () { // Flash On
        logger.log('INFO', 'FON - Flash On');
        this.writeScreen.setPen({ flash: true });
      }

      ccRDC () { // Resume Direct Captioning (switch mode to PaintOn)
        logger.log('INFO', 'RDC - Resume Direct Captioning');
        this.setMode('MODE_PAINT-ON');
      }

      ccTR () { // Text Restart in text mode (not supported, however)
        logger.log('INFO', 'TR');
        this.setMode('MODE_TEXT');
      }

      ccRTD () { // Resume Text Display in Text mode (not supported, however)
        logger.log('INFO', 'RTD');
        this.setMode('MODE_TEXT');
      }

      ccEDM () { // Erase Displayed Memory
        logger.log('INFO', 'EDM - Erase Displayed Memory');
        this.displayedMemory.reset();
        this.outputDataUpdate(true);
      }

      ccCR () { // Carriage Return
        logger.log('CR - Carriage Return');
        this.writeScreen.rollUp();
        this.outputDataUpdate(true);
      }

      ccENM () { // Erase Non-Displayed Memory
        logger.log('INFO', 'ENM - Erase Non-displayed Memory');
        this.nonDisplayedMemory.reset();
      }

      ccEOC () { // End of Caption (Flip Memories)
        logger.log('INFO', 'EOC - End Of Caption');
        if (this.mode === 'MODE_POP-ON') {
          let tmp = this.displayedMemory;
          this.displayedMemory = this.nonDisplayedMemory;
          this.nonDisplayedMemory = tmp;
          this.writeScreen = this.nonDisplayedMemory;
          logger.log('TEXT', 'DISP: ' + this.displayedMemory.getDisplayText());
        }
        this.outputDataUpdate(true);
      }

      ccTO (nrCols) { // Tab Offset 1,2, or 3 columns
        logger.log('INFO', 'TO(' + nrCols + ') - Tab Offset');
        this.writeScreen.moveCursor(nrCols);
      }

      ccMIDROW (secondByte) { // Parse MIDROW command
        let styles = { flash: false };
        styles.underline = secondByte % 2 === 1;
        styles.italics = secondByte >= 0x2e;
        if (!styles.italics) {
          let colorIndex = Math.floor(secondByte / 2) - 0x10;
          let colors = ['white', 'green', 'blue', 'cyan', 'red', 'yellow', 'magenta'];
          styles.foreground = colors[colorIndex];
        } else {
          styles.foreground = 'white';
        }
        logger.log('INFO', 'MIDROW: ' + JSON.stringify(styles));
        this.writeScreen.setPen(styles);
      }

      outputDataUpdate (dispatch = false) {
        let t = logger.time;
        if (t === null) {
          return;
        }

        if (this.outputFilter) {
          if (this.cueStartTime === null && !this.displayedMemory.isEmpty()) { // Start of a new cue
            this.cueStartTime = t;
          } else {
            if (!this.displayedMemory.equals(this.lastOutputScreen)) {
              if (this.outputFilter.newCue) {
                this.outputFilter.newCue(this.cueStartTime, t, this.lastOutputScreen);
                if (dispatch === true && this.outputFilter.dispatchCue) {
                  this.outputFilter.dispatchCue();
                }
              }
              this.cueStartTime = this.displayedMemory.isEmpty() ? null : t;
            }
          }
          this.lastOutputScreen.copy(this.displayedMemory);
        }
      }

      cueSplitAtTime (t) {
        if (this.outputFilter) {
          if (!this.displayedMemory.isEmpty()) {
            if (this.outputFilter.newCue) {
              this.outputFilter.newCue(this.cueStartTime, t, this.displayedMemory);
            }

            this.cueStartTime = t;
          }
        }
      }
    }

    class Cea608Parser {
      constructor (field, out1, out2) {
        this.field = field || 1;
        this.outputs = [out1, out2];
        this.channels = [new Cea608Channel(1, out1), new Cea608Channel(2, out2)];
        this.currChNr = -1; // Will be 1 or 2
        this.lastCmdA = null; // First byte of last command
        this.lastCmdB = null; // Second byte of last command
        this.bufferedData = [];
        this.startTime = null;
        this.lastTime = null;
        this.dataCounters = { 'padding': 0, 'char': 0, 'cmd': 0, 'other': 0 };
      }

      getHandler (index) {
        return this.channels[index].getHandler();
      }

      setHandler (index, newHandler) {
        this.channels[index].setHandler(newHandler);
      }

      /**
         * Add data for time t in forms of list of bytes (unsigned ints). The bytes are treated as pairs.
         */
      addData (t, byteList) {
        let cmdFound, a, b,
          charsFound = false;

        this.lastTime = t;
        logger.setTime(t);

        for (let i = 0; i < byteList.length; i += 2) {
          a = byteList[i] & 0x7f;
          b = byteList[i + 1] & 0x7f;
          if (a === 0 && b === 0) {
            this.dataCounters.padding += 2;
            continue;
          } else {
            logger.log('DATA', '[' + numArrayToHexArray([byteList[i], byteList[i + 1]]) + '] -> (' + numArrayToHexArray([a, b]) + ')');
          }
          cmdFound = this.parseCmd(a, b);
          if (!cmdFound) {
            cmdFound = this.parseMidrow(a, b);
          }

          if (!cmdFound) {
            cmdFound = this.parsePAC(a, b);
          }

          if (!cmdFound) {
            cmdFound = this.parseBackgroundAttributes(a, b);
          }

          if (!cmdFound) {
            charsFound = this.parseChars(a, b);
            if (charsFound) {
              if (this.currChNr && this.currChNr >= 0) {
                let channel = this.channels[this.currChNr - 1];
                channel.insertChars(charsFound);
              } else {
                logger.log('WARNING', 'No channel found yet. TEXT-MODE?');
              }
            }
          }
          if (cmdFound) {
            this.dataCounters.cmd += 2;
          } else if (charsFound) {
            this.dataCounters.char += 2;
          } else {
            this.dataCounters.other += 2;
            logger.log('WARNING', 'Couldn\'t parse cleaned data ' + numArrayToHexArray([a, b]) +
                                ' orig: ' + numArrayToHexArray([byteList[i], byteList[i + 1]]));
          }
        }
      }

      /**
         * Parse Command.
         * @returns {Boolean} Tells if a command was found
         */
      parseCmd (a, b) {
        let chNr = null;

        let cond1 = (a === 0x14 || a === 0x1C) && (b >= 0x20 && b <= 0x2F);
        let cond2 = (a === 0x17 || a === 0x1F) && (b >= 0x21 && b <= 0x23);
        if (!(cond1 || cond2)) {
          return false;
        }

        if (a === this.lastCmdA && b === this.lastCmdB) {
          this.lastCmdA = null;
          this.lastCmdB = null; // Repeated commands are dropped (once)
          logger.log('DEBUG', 'Repeated command (' + numArrayToHexArray([a, b]) + ') is dropped');
          return true;
        }

        if (a === 0x14 || a === 0x17) {
          chNr = 1;
        } else {
          chNr = 2;
        } // (a === 0x1C || a=== 0x1f)

        let channel = this.channels[chNr - 1];

        if (a === 0x14 || a === 0x1C) {
          if (b === 0x20) {
            channel.ccRCL();
          } else if (b === 0x21) {
            channel.ccBS();
          } else if (b === 0x22) {
            channel.ccAOF();
          } else if (b === 0x23) {
            channel.ccAON();
          } else if (b === 0x24) {
            channel.ccDER();
          } else if (b === 0x25) {
            channel.ccRU(2);
          } else if (b === 0x26) {
            channel.ccRU(3);
          } else if (b === 0x27) {
            channel.ccRU(4);
          } else if (b === 0x28) {
            channel.ccFON();
          } else if (b === 0x29) {
            channel.ccRDC();
          } else if (b === 0x2A) {
            channel.ccTR();
          } else if (b === 0x2B) {
            channel.ccRTD();
          } else if (b === 0x2C) {
            channel.ccEDM();
          } else if (b === 0x2D) {
            channel.ccCR();
          } else if (b === 0x2E) {
            channel.ccENM();
          } else if (b === 0x2F) {
            channel.ccEOC();
          }
        } else { // a == 0x17 || a == 0x1F
          channel.ccTO(b - 0x20);
        }
        this.lastCmdA = a;
        this.lastCmdB = b;
        this.currChNr = chNr;
        return true;
      }

      /**
         * Parse midrow styling command
         * @returns {Boolean}
         */
      parseMidrow (a, b) {
        let chNr = null;

        if (((a === 0x11) || (a === 0x19)) && b >= 0x20 && b <= 0x2f) {
          if (a === 0x11) {
            chNr = 1;
          } else {
            chNr = 2;
          }

          if (chNr !== this.currChNr) {
            logger.log('ERROR', 'Mismatch channel in midrow parsing');
            return false;
          }
          let channel = this.channels[chNr - 1];
          channel.ccMIDROW(b);
          logger.log('DEBUG', 'MIDROW (' + numArrayToHexArray([a, b]) + ')');
          return true;
        }
        return false;
      }
      /**
         * Parse Preable Access Codes (Table 53).
         * @returns {Boolean} Tells if PAC found
         */
      parsePAC (a, b) {
        let chNr = null;
        let row = null;

        let case1 = ((a >= 0x11 && a <= 0x17) || (a >= 0x19 && a <= 0x1F)) && (b >= 0x40 && b <= 0x7F);
        let case2 = (a === 0x10 || a === 0x18) && (b >= 0x40 && b <= 0x5F);
        if (!(case1 || case2)) {
          return false;
        }

        if (a === this.lastCmdA && b === this.lastCmdB) {
          this.lastCmdA = null;
          this.lastCmdB = null;
          return true; // Repeated commands are dropped (once)
        }

        chNr = (a <= 0x17) ? 1 : 2;

        if (b >= 0x40 && b <= 0x5F) {
          row = (chNr === 1) ? rowsLowCh1[a] : rowsLowCh2[a];
        } else { // 0x60 <= b <= 0x7F
          row = (chNr === 1) ? rowsHighCh1[a] : rowsHighCh2[a];
        }
        let pacData = this.interpretPAC(row, b);
        let channel = this.channels[chNr - 1];
        channel.setPAC(pacData);
        this.lastCmdA = a;
        this.lastCmdB = b;
        this.currChNr = chNr;
        return true;
      }

      /**
         * Interpret the second byte of the pac, and return the information.
         * @returns {Object} pacData with style parameters.
         */
      interpretPAC (row, byte) {
        let pacIndex = byte;
        let pacData = { color: null, italics: false, indent: null, underline: false, row: row };

        if (byte > 0x5F) {
          pacIndex = byte - 0x60;
        } else {
          pacIndex = byte - 0x40;
        }

        pacData.underline = (pacIndex & 1) === 1;
        if (pacIndex <= 0xd) {
          pacData.color = ['white', 'green', 'blue', 'cyan', 'red', 'yellow', 'magenta', 'white'][Math.floor(pacIndex / 2)];
        } else if (pacIndex <= 0xf) {
          pacData.italics = true;
          pacData.color = 'white';
        } else {
          pacData.indent = (Math.floor((pacIndex - 0x10) / 2)) * 4;
        }
        return pacData; // Note that row has zero offset. The spec uses 1.
      }

      /**
         * Parse characters.
         * @returns An array with 1 to 2 codes corresponding to chars, if found. null otherwise.
         */
      parseChars (a, b) {
        let channelNr = null,
          charCodes = null,
          charCode1 = null;

        if (a >= 0x19) {
          channelNr = 2;
          charCode1 = a - 8;
        } else {
          channelNr = 1;
          charCode1 = a;
        }
        if (charCode1 >= 0x11 && charCode1 <= 0x13) {
          // Special character
          let oneCode = b;
          if (charCode1 === 0x11) {
            oneCode = b + 0x50;
          } else if (charCode1 === 0x12) {
            oneCode = b + 0x70;
          } else {
            oneCode = b + 0x90;
          }

          logger.log('INFO', 'Special char \'' + getCharForByte(oneCode) + '\' in channel ' + channelNr);
          charCodes = [oneCode];
        } else if (a >= 0x20 && a <= 0x7f) {
          charCodes = (b === 0) ? [a] : [a, b];
        }
        if (charCodes) {
          let hexCodes = numArrayToHexArray(charCodes);
          logger.log('DEBUG', 'Char codes =  ' + hexCodes.join(','));
          this.lastCmdA = null;
          this.lastCmdB = null;
        }
        return charCodes;
      }

      /**
        * Parse extended background attributes as well as new foreground color black.
        * @returns{Boolean} Tells if background attributes are found
        */
      parseBackgroundAttributes (a, b) {
        let bkgData,
          index,
          chNr,
          channel;

        let case1 = (a === 0x10 || a === 0x18) && (b >= 0x20 && b <= 0x2f);
        let case2 = (a === 0x17 || a === 0x1f) && (b >= 0x2d && b <= 0x2f);
        if (!(case1 || case2)) {
          return false;
        }

        bkgData = {};
        if (a === 0x10 || a === 0x18) {
          index = Math.floor((b - 0x20) / 2);
          bkgData.background = backgroundColors[index];
          if (b % 2 === 1) {
            bkgData.background = bkgData.background + '_semi';
          }
        } else if (b === 0x2d) {
          bkgData.background = 'transparent';
        } else {
          bkgData.foreground = 'black';
          if (b === 0x2f) {
            bkgData.underline = true;
          }
        }
        chNr = (a < 0x18) ? 1 : 2;
        channel = this.channels[chNr - 1];
        channel.setBkgData(bkgData);
        this.lastCmdA = null;
        this.lastCmdB = null;
        return true;
      }

      /**
         * Reset state of parser and its channels.
         */
      reset () {
        for (let i = 0; i < this.channels.length; i++) {
          Eif (this.channels[i]) {
            this.channels[i].reset();
          }
        }
        this.lastCmdA = null;
        this.lastCmdB = null;
      }

      /**
         * Trigger the generation of a cue, and the start of a new one if displayScreens are not empty.
         */
      cueSplitAtTime (t) {
        for (let i = 0; i < this.channels.length; i++) {
          if (this.channels[i]) {
            this.channels[i].cueSplitAtTime(t);
          }
        }
      }
    }

    export default Cea608Parser;