jtBaseApp/node_modules/m3u8-parser/dist/m3u8-parser.es.js

/*! @name m3u8-parser @version 6.0.0 @license Apache-2.0 */
import Stream from '@videojs/vhs-utils/es/stream.js';
import _extends from '@babel/runtime/helpers/extends';
import decodeB64ToUint8Array from '@videojs/vhs-utils/es/decode-b64-to-uint8-array.js';

/**
 * @file m3u8/line-stream.js
 */
/**
 * A stream that buffers string input and generates a `data` event for each
 * line.
 *
 * @class LineStream
 * @extends Stream
 */

class LineStream extends Stream {
  constructor() {
    super();
    this.buffer = '';
  }
  /**
   * Add new data to be parsed.
   *
   * @param {string} data the text to process
   */


  push(data) {
    let nextNewline;
    this.buffer += data;
    nextNewline = this.buffer.indexOf('\n');

    for (; nextNewline > -1; nextNewline = this.buffer.indexOf('\n')) {
      this.trigger('data', this.buffer.substring(0, nextNewline));
      this.buffer = this.buffer.substring(nextNewline + 1);
    }
  }

}

const TAB = String.fromCharCode(0x09);

const parseByterange = function (byterangeString) {
  // optionally match and capture 0+ digits before `@`
  // optionally match and capture 0+ digits after `@`
  const match = /([0-9.]*)?@?([0-9.]*)?/.exec(byterangeString || '');
  const result = {};

  if (match[1]) {
    result.length = parseInt(match[1], 10);
  }

  if (match[2]) {
    result.offset = parseInt(match[2], 10);
  }

  return result;
};
/**
 * "forgiving" attribute list psuedo-grammar:
 * attributes -> keyvalue (',' keyvalue)*
 * keyvalue   -> key '=' value
 * key        -> [^=]*
 * value      -> '"' [^"]* '"' | [^,]*
 */


const attributeSeparator = function () {
  const key = '[^=]*';
  const value = '"[^"]*"|[^,]*';
  const keyvalue = '(?:' + key + ')=(?:' + value + ')';
  return new RegExp('(?:^|,)(' + keyvalue + ')');
};
/**
 * Parse attributes from a line given the separator
 *
 * @param {string} attributes the attribute line to parse
 */


const parseAttributes = function (attributes) {
  const result = {};

  if (!attributes) {
    return result;
  } // split the string using attributes as the separator


  const attrs = attributes.split(attributeSeparator());
  let i = attrs.length;
  let attr;

  while (i--) {
    // filter out unmatched portions of the string
    if (attrs[i] === '') {
      continue;
    } // split the key and value


    attr = /([^=]*)=(.*)/.exec(attrs[i]).slice(1); // trim whitespace and remove optional quotes around the value

    attr[0] = attr[0].replace(/^\s+|\s+$/g, '');
    attr[1] = attr[1].replace(/^\s+|\s+$/g, '');
    attr[1] = attr[1].replace(/^['"](.*)['"]$/g, '$1');
    result[attr[0]] = attr[1];
  }

  return result;
};
/**
 * A line-level M3U8 parser event stream. It expects to receive input one
 * line at a time and performs a context-free parse of its contents. A stream
 * interpretation of a manifest can be useful if the manifest is expected to
 * be too large to fit comfortably into memory or the entirety of the input
 * is not immediately available. Otherwise, it's probably much easier to work
 * with a regular `Parser` object.
 *
 * Produces `data` events with an object that captures the parser's
 * interpretation of the input. That object has a property `tag` that is one
 * of `uri`, `comment`, or `tag`. URIs only have a single additional
 * property, `line`, which captures the entirety of the input without
 * interpretation. Comments similarly have a single additional property
 * `text` which is the input without the leading `#`.
 *
 * Tags always have a property `tagType` which is the lower-cased version of
 * the M3U8 directive without the `#EXT` or `#EXT-X-` prefix. For instance,
 * `#EXT-X-MEDIA-SEQUENCE` becomes `media-sequence` when parsed. Unrecognized
 * tags are given the tag type `unknown` and a single additional property
 * `data` with the remainder of the input.
 *
 * @class ParseStream
 * @extends Stream
 */


class ParseStream extends Stream {
  constructor() {
    super();
    this.customParsers = [];
    this.tagMappers = [];
  }
  /**
   * Parses an additional line of input.
   *
   * @param {string} line a single line of an M3U8 file to parse
   */


  push(line) {
    let match;
    let event; // strip whitespace

    line = line.trim();

    if (line.length === 0) {
      // ignore empty lines
      return;
    } // URIs


    if (line[0] !== '#') {
      this.trigger('data', {
        type: 'uri',
        uri: line
      });
      return;
    } // map tags


    const newLines = this.tagMappers.reduce((acc, mapper) => {
      const mappedLine = mapper(line); // skip if unchanged

      if (mappedLine === line) {
        return acc;
      }

      return acc.concat([mappedLine]);
    }, [line]);
    newLines.forEach(newLine => {
      for (let i = 0; i < this.customParsers.length; i++) {
        if (this.customParsers[i].call(this, newLine)) {
          return;
        }
      } // Comments


      if (newLine.indexOf('#EXT') !== 0) {
        this.trigger('data', {
          type: 'comment',
          text: newLine.slice(1)
        });
        return;
      } // strip off any carriage returns here so the regex matching
      // doesn't have to account for them.


      newLine = newLine.replace('\r', ''); // Tags

      match = /^#EXTM3U/.exec(newLine);

      if (match) {
        this.trigger('data', {
          type: 'tag',
          tagType: 'm3u'
        });
        return;
      }

      match = /^#EXTINF:([0-9\.]*)?,?(.*)?$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'inf'
        };

        if (match[1]) {
          event.duration = parseFloat(match[1]);
        }

        if (match[2]) {
          event.title = match[2];
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-TARGETDURATION:([0-9.]*)?/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'targetduration'
        };

        if (match[1]) {
          event.duration = parseInt(match[1], 10);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-VERSION:([0-9.]*)?/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'version'
        };

        if (match[1]) {
          event.version = parseInt(match[1], 10);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-MEDIA-SEQUENCE:(\-?[0-9.]*)?/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'media-sequence'
        };

        if (match[1]) {
          event.number = parseInt(match[1], 10);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-DISCONTINUITY-SEQUENCE:(\-?[0-9.]*)?/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'discontinuity-sequence'
        };

        if (match[1]) {
          event.number = parseInt(match[1], 10);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-PLAYLIST-TYPE:(.*)?$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'playlist-type'
        };

        if (match[1]) {
          event.playlistType = match[1];
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-BYTERANGE:(.*)?$/.exec(newLine);

      if (match) {
        event = _extends(parseByterange(match[1]), {
          type: 'tag',
          tagType: 'byterange'
        });
        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-ALLOW-CACHE:(YES|NO)?/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'allow-cache'
        };

        if (match[1]) {
          event.allowed = !/NO/.test(match[1]);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-MAP:(.*)$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'map'
        };

        if (match[1]) {
          const attributes = parseAttributes(match[1]);

          if (attributes.URI) {
            event.uri = attributes.URI;
          }

          if (attributes.BYTERANGE) {
            event.byterange = parseByterange(attributes.BYTERANGE);
          }
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-STREAM-INF:(.*)$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'stream-inf'
        };

        if (match[1]) {
          event.attributes = parseAttributes(match[1]);

          if (event.attributes.RESOLUTION) {
            const split = event.attributes.RESOLUTION.split('x');
            const resolution = {};

            if (split[0]) {
              resolution.width = parseInt(split[0], 10);
            }

            if (split[1]) {
              resolution.height = parseInt(split[1], 10);
            }

            event.attributes.RESOLUTION = resolution;
          }

          if (event.attributes.BANDWIDTH) {
            event.attributes.BANDWIDTH = parseInt(event.attributes.BANDWIDTH, 10);
          }

          if (event.attributes['FRAME-RATE']) {
            event.attributes['FRAME-RATE'] = parseFloat(event.attributes['FRAME-RATE']);
          }

          if (event.attributes['PROGRAM-ID']) {
            event.attributes['PROGRAM-ID'] = parseInt(event.attributes['PROGRAM-ID'], 10);
          }
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-MEDIA:(.*)$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'media'
        };

        if (match[1]) {
          event.attributes = parseAttributes(match[1]);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-ENDLIST/.exec(newLine);

      if (match) {
        this.trigger('data', {
          type: 'tag',
          tagType: 'endlist'
        });
        return;
      }

      match = /^#EXT-X-DISCONTINUITY/.exec(newLine);

      if (match) {
        this.trigger('data', {
          type: 'tag',
          tagType: 'discontinuity'
        });
        return;
      }

      match = /^#EXT-X-PROGRAM-DATE-TIME:(.*)$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'program-date-time'
        };

        if (match[1]) {
          event.dateTimeString = match[1];
          event.dateTimeObject = new Date(match[1]);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-KEY:(.*)$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'key'
        };

        if (match[1]) {
          event.attributes = parseAttributes(match[1]); // parse the IV string into a Uint32Array

          if (event.attributes.IV) {
            if (event.attributes.IV.substring(0, 2).toLowerCase() === '0x') {
              event.attributes.IV = event.attributes.IV.substring(2);
            }

            event.attributes.IV = event.attributes.IV.match(/.{8}/g);
            event.attributes.IV[0] = parseInt(event.attributes.IV[0], 16);
            event.attributes.IV[1] = parseInt(event.attributes.IV[1], 16);
            event.attributes.IV[2] = parseInt(event.attributes.IV[2], 16);
            event.attributes.IV[3] = parseInt(event.attributes.IV[3], 16);
            event.attributes.IV = new Uint32Array(event.attributes.IV);
          }
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-START:(.*)$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'start'
        };

        if (match[1]) {
          event.attributes = parseAttributes(match[1]);
          event.attributes['TIME-OFFSET'] = parseFloat(event.attributes['TIME-OFFSET']);
          event.attributes.PRECISE = /YES/.test(event.attributes.PRECISE);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-CUE-OUT-CONT:(.*)?$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'cue-out-cont'
        };

        if (match[1]) {
          event.data = match[1];
        } else {
          event.data = '';
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-CUE-OUT:(.*)?$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'cue-out'
        };

        if (match[1]) {
          event.data = match[1];
        } else {
          event.data = '';
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-CUE-IN:(.*)?$/.exec(newLine);

      if (match) {
        event = {
          type: 'tag',
          tagType: 'cue-in'
        };

        if (match[1]) {
          event.data = match[1];
        } else {
          event.data = '';
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-SKIP:(.*)$/.exec(newLine);

      if (match && match[1]) {
        event = {
          type: 'tag',
          tagType: 'skip'
        };
        event.attributes = parseAttributes(match[1]);

        if (event.attributes.hasOwnProperty('SKIPPED-SEGMENTS')) {
          event.attributes['SKIPPED-SEGMENTS'] = parseInt(event.attributes['SKIPPED-SEGMENTS'], 10);
        }

        if (event.attributes.hasOwnProperty('RECENTLY-REMOVED-DATERANGES')) {
          event.attributes['RECENTLY-REMOVED-DATERANGES'] = event.attributes['RECENTLY-REMOVED-DATERANGES'].split(TAB);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-PART:(.*)$/.exec(newLine);

      if (match && match[1]) {
        event = {
          type: 'tag',
          tagType: 'part'
        };
        event.attributes = parseAttributes(match[1]);
        ['DURATION'].forEach(function (key) {
          if (event.attributes.hasOwnProperty(key)) {
            event.attributes[key] = parseFloat(event.attributes[key]);
          }
        });
        ['INDEPENDENT', 'GAP'].forEach(function (key) {
          if (event.attributes.hasOwnProperty(key)) {
            event.attributes[key] = /YES/.test(event.attributes[key]);
          }
        });

        if (event.attributes.hasOwnProperty('BYTERANGE')) {
          event.attributes.byterange = parseByterange(event.attributes.BYTERANGE);
        }

        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-SERVER-CONTROL:(.*)$/.exec(newLine);

      if (match && match[1]) {
        event = {
          type: 'tag',
          tagType: 'server-control'
        };
        event.attributes = parseAttributes(match[1]);
        ['CAN-SKIP-UNTIL', 'PART-HOLD-BACK', 'HOLD-BACK'].forEach(function (key) {
          if (event.attributes.hasOwnProperty(key)) {
            event.attributes[key] = parseFloat(event.attributes[key]);
          }
        });
        ['CAN-SKIP-DATERANGES', 'CAN-BLOCK-RELOAD'].forEach(function (key) {
          if (event.attributes.hasOwnProperty(key)) {
            event.attributes[key] = /YES/.test(event.attributes[key]);
          }
        });
        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-PART-INF:(.*)$/.exec(newLine);

      if (match && match[1]) {
        event = {
          type: 'tag',
          tagType: 'part-inf'
        };
        event.attributes = parseAttributes(match[1]);
        ['PART-TARGET'].forEach(function (key) {
          if (event.attributes.hasOwnProperty(key)) {
            event.attributes[key] = parseFloat(event.attributes[key]);
          }
        });
        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-PRELOAD-HINT:(.*)$/.exec(newLine);

      if (match && match[1]) {
        event = {
          type: 'tag',
          tagType: 'preload-hint'
        };
        event.attributes = parseAttributes(match[1]);
        ['BYTERANGE-START', 'BYTERANGE-LENGTH'].forEach(function (key) {
          if (event.attributes.hasOwnProperty(key)) {
            event.attributes[key] = parseInt(event.attributes[key], 10);
            const subkey = key === 'BYTERANGE-LENGTH' ? 'length' : 'offset';
            event.attributes.byterange = event.attributes.byterange || {};
            event.attributes.byterange[subkey] = event.attributes[key]; // only keep the parsed byterange object.

            delete event.attributes[key];
          }
        });
        this.trigger('data', event);
        return;
      }

      match = /^#EXT-X-RENDITION-REPORT:(.*)$/.exec(newLine);

      if (match && match[1]) {
        event = {
          type: 'tag',
          tagType: 'rendition-report'
        };
        event.attributes = parseAttributes(match[1]);
        ['LAST-MSN', 'LAST-PART'].forEach(function (key) {
          if (event.attributes.hasOwnProperty(key)) {
            event.attributes[key] = parseInt(event.attributes[key], 10);
          }
        });
        this.trigger('data', event);
        return;
      } // unknown tag type


      this.trigger('data', {
        type: 'tag',
        data: newLine.slice(4)
      });
    });
  }
  /**
   * Add a parser for custom headers
   *
   * @param {Object}   options              a map of options for the added parser
   * @param {RegExp}   options.expression   a regular expression to match the custom header
   * @param {string}   options.customType   the custom type to register to the output
   * @param {Function} [options.dataParser] function to parse the line into an object
   * @param {boolean}  [options.segment]    should tag data be attached to the segment object
   */


  addParser({
    expression,
    customType,
    dataParser,
    segment
  }) {
    if (typeof dataParser !== 'function') {
      dataParser = line => line;
    }

    this.customParsers.push(line => {
      const match = expression.exec(line);

      if (match) {
        this.trigger('data', {
          type: 'custom',
          data: dataParser(line),
          customType,
          segment
        });
        return true;
      }
    });
  }
  /**
   * Add a custom header mapper
   *
   * @param {Object}   options
   * @param {RegExp}   options.expression   a regular expression to match the custom header
   * @param {Function} options.map          function to translate tag into a different tag
   */


  addTagMapper({
    expression,
    map
  }) {
    const mapFn = line => {
      if (expression.test(line)) {
        return map(line);
      }

      return line;
    };

    this.tagMappers.push(mapFn);
  }

}

const camelCase = str => str.toLowerCase().replace(/-(\w)/g, a => a[1].toUpperCase());

const camelCaseKeys = function (attributes) {
  const result = {};
  Object.keys(attributes).forEach(function (key) {
    result[camelCase(key)] = attributes[key];
  });
  return result;
}; // set SERVER-CONTROL hold back based upon targetDuration and partTargetDuration
// we need this helper because defaults are based upon targetDuration and
// partTargetDuration being set, but they may not be if SERVER-CONTROL appears before
// target durations are set.


const setHoldBack = function (manifest) {
  const {
    serverControl,
    targetDuration,
    partTargetDuration
  } = manifest;

  if (!serverControl) {
    return;
  }

  const tag = '#EXT-X-SERVER-CONTROL';
  const hb = 'holdBack';
  const phb = 'partHoldBack';
  const minTargetDuration = targetDuration && targetDuration * 3;
  const minPartDuration = partTargetDuration && partTargetDuration * 2;

  if (targetDuration && !serverControl.hasOwnProperty(hb)) {
    serverControl[hb] = minTargetDuration;
    this.trigger('info', {
      message: `${tag} defaulting HOLD-BACK to targetDuration * 3 (${minTargetDuration}).`
    });
  }

  if (minTargetDuration && serverControl[hb] < minTargetDuration) {
    this.trigger('warn', {
      message: `${tag} clamping HOLD-BACK (${serverControl[hb]}) to targetDuration * 3 (${minTargetDuration})`
    });
    serverControl[hb] = minTargetDuration;
  } // default no part hold back to part target duration * 3


  if (partTargetDuration && !serverControl.hasOwnProperty(phb)) {
    serverControl[phb] = partTargetDuration * 3;
    this.trigger('info', {
      message: `${tag} defaulting PART-HOLD-BACK to partTargetDuration * 3 (${serverControl[phb]}).`
    });
  } // if part hold back is too small default it to part target duration * 2


  if (partTargetDuration && serverControl[phb] < minPartDuration) {
    this.trigger('warn', {
      message: `${tag} clamping PART-HOLD-BACK (${serverControl[phb]}) to partTargetDuration * 2 (${minPartDuration}).`
    });
    serverControl[phb] = minPartDuration;
  }
};
/**
 * A parser for M3U8 files. The current interpretation of the input is
 * exposed as a property `manifest` on parser objects. It's just two lines to
 * create and parse a manifest once you have the contents available as a string:
 *
 * ```js
 * var parser = new m3u8.Parser();
 * parser.push(xhr.responseText);
 * ```
 *
 * New input can later be applied to update the manifest object by calling
 * `push` again.
 *
 * The parser attempts to create a usable manifest object even if the
 * underlying input is somewhat nonsensical. It emits `info` and `warning`
 * events during the parse if it encounters input that seems invalid or
 * requires some property of the manifest object to be defaulted.
 *
 * @class Parser
 * @extends Stream
 */


class Parser extends Stream {
  constructor() {
    super();
    this.lineStream = new LineStream();
    this.parseStream = new ParseStream();
    this.lineStream.pipe(this.parseStream);
    /* eslint-disable consistent-this */

    const self = this;
    /* eslint-enable consistent-this */

    const uris = [];
    let currentUri = {}; // if specified, the active EXT-X-MAP definition

    let currentMap; // if specified, the active decryption key

    let key;
    let hasParts = false;

    const noop = function () {};

    const defaultMediaGroups = {
      'AUDIO': {},
      'VIDEO': {},
      'CLOSED-CAPTIONS': {},
      'SUBTITLES': {}
    }; // This is the Widevine UUID from DASH IF IOP. The same exact string is
    // used in MPDs with Widevine encrypted streams.

    const widevineUuid = 'urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed'; // group segments into numbered timelines delineated by discontinuities

    let currentTimeline = 0; // the manifest is empty until the parse stream begins delivering data

    this.manifest = {
      allowCache: true,
      discontinuityStarts: [],
      segments: []
    }; // keep track of the last seen segment's byte range end, as segments are not required
    // to provide the offset, in which case it defaults to the next byte after the
    // previous segment

    let lastByterangeEnd = 0; // keep track of the last seen part's byte range end.

    let lastPartByterangeEnd = 0;
    this.on('end', () => {
      // only add preloadSegment if we don't yet have a uri for it.
      // and we actually have parts/preloadHints
      if (currentUri.uri || !currentUri.parts && !currentUri.preloadHints) {
        return;
      }

      if (!currentUri.map && currentMap) {
        currentUri.map = currentMap;
      }

      if (!currentUri.key && key) {
        currentUri.key = key;
      }

      if (!currentUri.timeline && typeof currentTimeline === 'number') {
        currentUri.timeline = currentTimeline;
      }

      this.manifest.preloadSegment = currentUri;
    }); // update the manifest with the m3u8 entry from the parse stream

    this.parseStream.on('data', function (entry) {
      let mediaGroup;
      let rendition;
      ({
        tag() {
          // switch based on the tag type
          (({
            version() {
              if (entry.version) {
                this.manifest.version = entry.version;
              }
            },

            'allow-cache'() {
              this.manifest.allowCache = entry.allowed;

              if (!('allowed' in entry)) {
                this.trigger('info', {
                  message: 'defaulting allowCache to YES'
                });
                this.manifest.allowCache = true;
              }
            },

            byterange() {
              const byterange = {};

              if ('length' in entry) {
                currentUri.byterange = byterange;
                byterange.length = entry.length;

                if (!('offset' in entry)) {
                  /*
                   * From the latest spec (as of this writing):
                   * https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-4.3.2.2
                   *
                   * Same text since EXT-X-BYTERANGE's introduction in draft 7:
                   * https://tools.ietf.org/html/draft-pantos-http-live-streaming-07#section-3.3.1)
                   *
                   * "If o [offset] is not present, the sub-range begins at the next byte
                   * following the sub-range of the previous media segment."
                   */
                  entry.offset = lastByterangeEnd;
                }
              }

              if ('offset' in entry) {
                currentUri.byterange = byterange;
                byterange.offset = entry.offset;
              }

              lastByterangeEnd = byterange.offset + byterange.length;
            },

            endlist() {
              this.manifest.endList = true;
            },

            inf() {
              if (!('mediaSequence' in this.manifest)) {
                this.manifest.mediaSequence = 0;
                this.trigger('info', {
                  message: 'defaulting media sequence to zero'
                });
              }

              if (!('discontinuitySequence' in this.manifest)) {
                this.manifest.discontinuitySequence = 0;
                this.trigger('info', {
                  message: 'defaulting discontinuity sequence to zero'
                });
              }

              if (entry.duration > 0) {
                currentUri.duration = entry.duration;
              }

              if (entry.duration === 0) {
                currentUri.duration = 0.01;
                this.trigger('info', {
                  message: 'updating zero segment duration to a small value'
                });
              }

              this.manifest.segments = uris;
            },

            key() {
              if (!entry.attributes) {
                this.trigger('warn', {
                  message: 'ignoring key declaration without attribute list'
                });
                return;
              } // clear the active encryption key


              if (entry.attributes.METHOD === 'NONE') {
                key = null;
                return;
              }

              if (!entry.attributes.URI) {
                this.trigger('warn', {
                  message: 'ignoring key declaration without URI'
                });
                return;
              }

              if (entry.attributes.KEYFORMAT === 'com.apple.streamingkeydelivery') {
                this.manifest.contentProtection = this.manifest.contentProtection || {}; // TODO: add full support for this.

                this.manifest.contentProtection['com.apple.fps.1_0'] = {
                  attributes: entry.attributes
                };
                return;
              }

              if (entry.attributes.KEYFORMAT === 'com.microsoft.playready') {
                this.manifest.contentProtection = this.manifest.contentProtection || {}; // TODO: add full support for this.

                this.manifest.contentProtection['com.microsoft.playready'] = {
                  uri: entry.attributes.URI
                };
                return;
              } // check if the content is encrypted for Widevine
              // Widevine/HLS spec: https://storage.googleapis.com/wvdocs/Widevine_DRM_HLS.pdf


              if (entry.attributes.KEYFORMAT === widevineUuid) {
                const VALID_METHODS = ['SAMPLE-AES', 'SAMPLE-AES-CTR', 'SAMPLE-AES-CENC'];

                if (VALID_METHODS.indexOf(entry.attributes.METHOD) === -1) {
                  this.trigger('warn', {
                    message: 'invalid key method provided for Widevine'
                  });
                  return;
                }

                if (entry.attributes.METHOD === 'SAMPLE-AES-CENC') {
                  this.trigger('warn', {
                    message: 'SAMPLE-AES-CENC is deprecated, please use SAMPLE-AES-CTR instead'
                  });
                }

                if (entry.attributes.URI.substring(0, 23) !== 'data:text/plain;base64,') {
                  this.trigger('warn', {
                    message: 'invalid key URI provided for Widevine'
                  });
                  return;
                }

                if (!(entry.attributes.KEYID && entry.attributes.KEYID.substring(0, 2) === '0x')) {
                  this.trigger('warn', {
                    message: 'invalid key ID provided for Widevine'
                  });
                  return;
                } // if Widevine key attributes are valid, store them as `contentProtection`
                // on the manifest to emulate Widevine tag structure in a DASH mpd


                this.manifest.contentProtection = this.manifest.contentProtection || {};
                this.manifest.contentProtection['com.widevine.alpha'] = {
                  attributes: {
                    schemeIdUri: entry.attributes.KEYFORMAT,
                    // remove '0x' from the key id string
                    keyId: entry.attributes.KEYID.substring(2)
                  },
                  // decode the base64-encoded PSSH box
                  pssh: decodeB64ToUint8Array(entry.attributes.URI.split(',')[1])
                };
                return;
              }

              if (!entry.attributes.METHOD) {
                this.trigger('warn', {
                  message: 'defaulting key method to AES-128'
                });
              } // setup an encryption key for upcoming segments


              key = {
                method: entry.attributes.METHOD || 'AES-128',
                uri: entry.attributes.URI
              };

              if (typeof entry.attributes.IV !== 'undefined') {
                key.iv = entry.attributes.IV;
              }
            },

            'media-sequence'() {
              if (!isFinite(entry.number)) {
                this.trigger('warn', {
                  message: 'ignoring invalid media sequence: ' + entry.number
                });
                return;
              }

              this.manifest.mediaSequence = entry.number;
            },

            'discontinuity-sequence'() {
              if (!isFinite(entry.number)) {
                this.trigger('warn', {
                  message: 'ignoring invalid discontinuity sequence: ' + entry.number
                });
                return;
              }

              this.manifest.discontinuitySequence = entry.number;
              currentTimeline = entry.number;
            },

            'playlist-type'() {
              if (!/VOD|EVENT/.test(entry.playlistType)) {
                this.trigger('warn', {
                  message: 'ignoring unknown playlist type: ' + entry.playlist
                });
                return;
              }

              this.manifest.playlistType = entry.playlistType;
            },

            map() {
              currentMap = {};

              if (entry.uri) {
                currentMap.uri = entry.uri;
              }

              if (entry.byterange) {
                currentMap.byterange = entry.byterange;
              }

              if (key) {
                currentMap.key = key;
              }
            },

            'stream-inf'() {
              this.manifest.playlists = uris;
              this.manifest.mediaGroups = this.manifest.mediaGroups || defaultMediaGroups;

              if (!entry.attributes) {
                this.trigger('warn', {
                  message: 'ignoring empty stream-inf attributes'
                });
                return;
              }

              if (!currentUri.attributes) {
                currentUri.attributes = {};
              }

              _extends(currentUri.attributes, entry.attributes);
            },

            media() {
              this.manifest.mediaGroups = this.manifest.mediaGroups || defaultMediaGroups;

              if (!(entry.attributes && entry.attributes.TYPE && entry.attributes['GROUP-ID'] && entry.attributes.NAME)) {
                this.trigger('warn', {
                  message: 'ignoring incomplete or missing media group'
                });
                return;
              } // find the media group, creating defaults as necessary


              const mediaGroupType = this.manifest.mediaGroups[entry.attributes.TYPE];
              mediaGroupType[entry.attributes['GROUP-ID']] = mediaGroupType[entry.attributes['GROUP-ID']] || {};
              mediaGroup = mediaGroupType[entry.attributes['GROUP-ID']]; // collect the rendition metadata

              rendition = {
                default: /yes/i.test(entry.attributes.DEFAULT)
              };

              if (rendition.default) {
                rendition.autoselect = true;
              } else {
                rendition.autoselect = /yes/i.test(entry.attributes.AUTOSELECT);
              }

              if (entry.attributes.LANGUAGE) {
                rendition.language = entry.attributes.LANGUAGE;
              }

              if (entry.attributes.URI) {
                rendition.uri = entry.attributes.URI;
              }

              if (entry.attributes['INSTREAM-ID']) {
                rendition.instreamId = entry.attributes['INSTREAM-ID'];
              }

              if (entry.attributes.CHARACTERISTICS) {
                rendition.characteristics = entry.attributes.CHARACTERISTICS;
              }

              if (entry.attributes.FORCED) {
                rendition.forced = /yes/i.test(entry.attributes.FORCED);
              } // insert the new rendition


              mediaGroup[entry.attributes.NAME] = rendition;
            },

            discontinuity() {
              currentTimeline += 1;
              currentUri.discontinuity = true;
              this.manifest.discontinuityStarts.push(uris.length);
            },

            'program-date-time'() {
              if (typeof this.manifest.dateTimeString === 'undefined') {
                // PROGRAM-DATE-TIME is a media-segment tag, but for backwards
                // compatibility, we add the first occurence of the PROGRAM-DATE-TIME tag
                // to the manifest object
                // TODO: Consider removing this in future major version
                this.manifest.dateTimeString = entry.dateTimeString;
                this.manifest.dateTimeObject = entry.dateTimeObject;
              }

              currentUri.dateTimeString = entry.dateTimeString;
              currentUri.dateTimeObject = entry.dateTimeObject;
            },

            targetduration() {
              if (!isFinite(entry.duration) || entry.duration < 0) {
                this.trigger('warn', {
                  message: 'ignoring invalid target duration: ' + entry.duration
                });
                return;
              }

              this.manifest.targetDuration = entry.duration;
              setHoldBack.call(this, this.manifest);
            },

            start() {
              if (!entry.attributes || isNaN(entry.attributes['TIME-OFFSET'])) {
                this.trigger('warn', {
                  message: 'ignoring start declaration without appropriate attribute list'
                });
                return;
              }

              this.manifest.start = {
                timeOffset: entry.attributes['TIME-OFFSET'],
                precise: entry.attributes.PRECISE
              };
            },

            'cue-out'() {
              currentUri.cueOut = entry.data;
            },

            'cue-out-cont'() {
              currentUri.cueOutCont = entry.data;
            },

            'cue-in'() {
              currentUri.cueIn = entry.data;
            },

            'skip'() {
              this.manifest.skip = camelCaseKeys(entry.attributes);
              this.warnOnMissingAttributes_('#EXT-X-SKIP', entry.attributes, ['SKIPPED-SEGMENTS']);
            },

            'part'() {
              hasParts = true; // parts are always specifed before a segment

              const segmentIndex = this.manifest.segments.length;
              const part = camelCaseKeys(entry.attributes);
              currentUri.parts = currentUri.parts || [];
              currentUri.parts.push(part);

              if (part.byterange) {
                if (!part.byterange.hasOwnProperty('offset')) {
                  part.byterange.offset = lastPartByterangeEnd;
                }

                lastPartByterangeEnd = part.byterange.offset + part.byterange.length;
              }

              const partIndex = currentUri.parts.length - 1;
              this.warnOnMissingAttributes_(`#EXT-X-PART #${partIndex} for segment #${segmentIndex}`, entry.attributes, ['URI', 'DURATION']);

              if (this.manifest.renditionReports) {
                this.manifest.renditionReports.forEach((r, i) => {
                  if (!r.hasOwnProperty('lastPart')) {
                    this.trigger('warn', {
                      message: `#EXT-X-RENDITION-REPORT #${i} lacks required attribute(s): LAST-PART`
                    });
                  }
                });
              }
            },

            'server-control'() {
              const attrs = this.manifest.serverControl = camelCaseKeys(entry.attributes);

              if (!attrs.hasOwnProperty('canBlockReload')) {
                attrs.canBlockReload = false;
                this.trigger('info', {
                  message: '#EXT-X-SERVER-CONTROL defaulting CAN-BLOCK-RELOAD to false'
                });
              }

              setHoldBack.call(this, this.manifest);

              if (attrs.canSkipDateranges && !attrs.hasOwnProperty('canSkipUntil')) {
                this.trigger('warn', {
                  message: '#EXT-X-SERVER-CONTROL lacks required attribute CAN-SKIP-UNTIL which is required when CAN-SKIP-DATERANGES is set'
                });
              }
            },

            'preload-hint'() {
              // parts are always specifed before a segment
              const segmentIndex = this.manifest.segments.length;
              const hint = camelCaseKeys(entry.attributes);
              const isPart = hint.type && hint.type === 'PART';
              currentUri.preloadHints = currentUri.preloadHints || [];
              currentUri.preloadHints.push(hint);

              if (hint.byterange) {
                if (!hint.byterange.hasOwnProperty('offset')) {
                  // use last part byterange end or zero if not a part.
                  hint.byterange.offset = isPart ? lastPartByterangeEnd : 0;

                  if (isPart) {
                    lastPartByterangeEnd = hint.byterange.offset + hint.byterange.length;
                  }
                }
              }

              const index = currentUri.preloadHints.length - 1;
              this.warnOnMissingAttributes_(`#EXT-X-PRELOAD-HINT #${index} for segment #${segmentIndex}`, entry.attributes, ['TYPE', 'URI']);

              if (!hint.type) {
                return;
              } // search through all preload hints except for the current one for
              // a duplicate type.


              for (let i = 0; i < currentUri.preloadHints.length - 1; i++) {
                const otherHint = currentUri.preloadHints[i];

                if (!otherHint.type) {
                  continue;
                }

                if (otherHint.type === hint.type) {
                  this.trigger('warn', {
                    message: `#EXT-X-PRELOAD-HINT #${index} for segment #${segmentIndex} has the same TYPE ${hint.type} as preload hint #${i}`
                  });
                }
              }
            },

            'rendition-report'() {
              const report = camelCaseKeys(entry.attributes);
              this.manifest.renditionReports = this.manifest.renditionReports || [];
              this.manifest.renditionReports.push(report);
              const index = this.manifest.renditionReports.length - 1;
              const required = ['LAST-MSN', 'URI'];

              if (hasParts) {
                required.push('LAST-PART');
              }

              this.warnOnMissingAttributes_(`#EXT-X-RENDITION-REPORT #${index}`, entry.attributes, required);
            },

            'part-inf'() {
              this.manifest.partInf = camelCaseKeys(entry.attributes);
              this.warnOnMissingAttributes_('#EXT-X-PART-INF', entry.attributes, ['PART-TARGET']);

              if (this.manifest.partInf.partTarget) {
                this.manifest.partTargetDuration = this.manifest.partInf.partTarget;
              }

              setHoldBack.call(this, this.manifest);
            }

          })[entry.tagType] || noop).call(self);
        },

        uri() {
          currentUri.uri = entry.uri;
          uris.push(currentUri); // if no explicit duration was declared, use the target duration

          if (this.manifest.targetDuration && !('duration' in currentUri)) {
            this.trigger('warn', {
              message: 'defaulting segment duration to the target duration'
            });
            currentUri.duration = this.manifest.targetDuration;
          } // annotate with encryption information, if necessary


          if (key) {
            currentUri.key = key;
          }

          currentUri.timeline = currentTimeline; // annotate with initialization segment information, if necessary

          if (currentMap) {
            currentUri.map = currentMap;
          } // reset the last byterange end as it needs to be 0 between parts


          lastPartByterangeEnd = 0; // prepare for the next URI

          currentUri = {};
        },

        comment() {// comments are not important for playback
        },

        custom() {
          // if this is segment-level data attach the output to the segment
          if (entry.segment) {
            currentUri.custom = currentUri.custom || {};
            currentUri.custom[entry.customType] = entry.data; // if this is manifest-level data attach to the top level manifest object
          } else {
            this.manifest.custom = this.manifest.custom || {};
            this.manifest.custom[entry.customType] = entry.data;
          }
        }

      })[entry.type].call(self);
    });
  }

  warnOnMissingAttributes_(identifier, attributes, required) {
    const missing = [];
    required.forEach(function (key) {
      if (!attributes.hasOwnProperty(key)) {
        missing.push(key);
      }
    });

    if (missing.length) {
      this.trigger('warn', {
        message: `${identifier} lacks required attribute(s): ${missing.join(', ')}`
      });
    }
  }
  /**
   * Parse the input string and update the manifest object.
   *
   * @param {string} chunk a potentially incomplete portion of the manifest
   */


  push(chunk) {
    this.lineStream.push(chunk);
  }
  /**
   * Flush any remaining input. This can be handy if the last line of an M3U8
   * manifest did not contain a trailing newline but the file has been
   * completely received.
   */


  end() {
    // flush any buffered input
    this.lineStream.push('\n');
    this.trigger('end');
  }
  /**
   * Add an additional parser for non-standard tags
   *
   * @param {Object}   options              a map of options for the added parser
   * @param {RegExp}   options.expression   a regular expression to match the custom header
   * @param {string}   options.type         the type to register to the output
   * @param {Function} [options.dataParser] function to parse the line into an object
   * @param {boolean}  [options.segment]    should tag data be attached to the segment object
   */


  addParser(options) {
    this.parseStream.addParser(options);
  }
  /**
   * Add a custom header mapper
   *
   * @param {Object}   options
   * @param {RegExp}   options.expression   a regular expression to match the custom header
   * @param {Function} options.map          function to translate tag into a different tag
   */


  addTagMapper(options) {
    this.parseStream.addTagMapper(options);
  }

}

export { LineStream, ParseStream, Parser };