@eyevinn/m3u8/m3u/PlaylistItem.js

streaming m3u8 parser for Apple's HTTP Live Streaming protocol

var util = require('util'),
  Item = require('./Item');

var PlaylistItem = (module.exports = function PlaylistItem() {
  Item.call(this);
});

util.inherits(PlaylistItem, Item);

PlaylistItem.create = function createPlaylistItem(data) {
  var item = new PlaylistItem();
  item.setData(data);
  return item;
};

PlaylistItem.prototype.toString = function toString() {
  var output = [];
  if (this.get('discontinuity')) {
    output.push('#EXT-X-DISCONTINUITY');
  }
  if (this.get('start-timeoffset')) {
    var line = `#EXT-X-START:TIME-OFFSET=${this.get('start-timeoffset')}`;
    if (this.get('start-precise')) {
      line += `,PRECISE=${this.get('start-precise') ? 'YES' : 'NO'}`;
    }
    output.push(line);
  }
  if (this.get('cuein')) {
    output.push('#EXT-X-CUE-IN');
  }
  if (this.get('cueout')) {
    var duration = this.get('cueout');
    output.push('#EXT-X-CUE-OUT:DURATION=' + duration);
  }
  if (this.get('cont-offset') && this.get('cont-dur')) {
    var cueOutContOffset = this.get('cont-offset');
    var cueOutContDuration = this.get('cont-dur');
    output.push('#EXT-X-CUE-OUT-CONT:' + cueOutContOffset + '/' + cueOutContDuration);
  }
  if (this.get('date')) {
    var date = this.get('date');
    if (date.getMonth) {
      date = date.toISOString();
    }
    output.push('#EXT-X-PROGRAM-DATE-TIME:' + date);
  }
  if (this.get('map-uri')) {
    var line = `#EXT-X-MAP:URI="${this.get('map-uri')}"`;
    if (this.get('map-byterange')) {
      line += `,BYTERANGE=${this.get('map-byterange')}`;
    }
    output.push(line);
  }
  if (this.get('keys') && Object(this.get('keys')).length > 0) {
    var keys = this.get('keys');
    var keyFormats = Object.keys(this.get('keys'));
    for (let i = 0; i < keysFormats.length; i++) {
      const key = keys[keyFormats[i]];
      var line = `#EXT-X-KEY:METHOD=${key['key-method']}`;
      if (key['key-uri']) {
        line += `,URI="${key['key-uri']}"`;
      }
      if (key['key-iv']) {
        line += `,IV=${key['key-iv']}`;
      }
      if (key['key-keyformat']) {
        line += `,KEYFORMAT="${key['key-keyformat']}"`;
      }
      if (key['key-keyformatversions']) {
        line += `,KEYFORMATVERSIONS="${key['key-keyformatversions']}"`;
      }
      output.push(line);  
    }
  } else if (this.get('key-method')) {
    var line = `#EXT-X-KEY:METHOD=${this.get('key-method')}`;
    if (this.get('key-uri')) {
      line += `,URI="${this.get('key-uri')}"`;
    }
    if (this.get('key-iv')) {
      line += `,IV=${this.get('key-iv')}`;
    }
    if (this.get('key-keyformat')) {
      line += `,KEYFORMAT="${this.get('key-keyformat')}"`;
    }
    if (this.get('key-keyformatversions')) {
      line += `,KEYFORMATVERSIONS="${this.get('key-keyformatversions')}"`;
    }
    output.push(line);
  }

  if (this.get('daiPlacementOpportunity')) {
    output.push('#EXT-X-PLACEMENT-OPPORTUNITY');
  }
  if (this.get('daterange') != null) {
    var attr = this.get('daterange');
    var s = Object.keys(attr)
      .map(function (key) {
        if (attr['CLASS'] === 'com.apple.hls.interstitial' && (key === 'X-RESUME-OFFSET' || key === 'X-PLAYOUT-LIMIT')) {
          // The CLASS=com.apple.hls.interstitial has some daterange attributes
          // that are not quoted strings
          return key + '=' + `${attr[key]}`;
        } else if (key === 'DURATION') {
          return key + '=' + `${attr[key]}`;
        } else {
          return key + '=' + `"${attr[key]}"`;
        }
      })
      .join(',');
    output.push('#EXT-X-DATERANGE:' + s);
  }
  if (this.get('duration') != null || this.get('title') != null) {
    output.push('#EXTINF:' + [this.get('duration').toFixed(4), this.get('title')].join(','));
  }
  if (this.get('byteRange') != null) {
    output.push('#EXT-X-BYTERANGE:' + this.get('byteRange'));
  }
  if (this.get('uri')) {
    output.push(this.get('uri'));
  }

  return output.join('\n');
};