Source: lib/text/sbv_text_parser.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  7. goog.provide('shaka.text.SbvTextParser');
  9. goog.require('goog.asserts');
  10. goog.require('shaka.text.Cue');
  11. goog.require('shaka.text.TextEngine');
  12. goog.require('shaka.util.Error');
  13. goog.require('shaka.util.StringUtils');
  14. goog.require('shaka.util.TextParser');
  17. /**
  18.  * @implements {shaka.extern.TextParser}
  19.  * @export
  20.  */
  21. shaka.text.SbvTextParser = class {
  22.   /**
  23.    * @override
  24.    * @export
  25.    */
  26.   parseInit(data) {
  27.     goog.asserts.assert(false, 'SubViewer does not have init segments');
  28.   }
  30.   /**
  31.    * @override
  32.    * @export
  33.    */
  34.   setSequenceMode(sequenceMode) {
  35.     // Unused.
  36.   }
  38.   /**
  39.    * @override
  40.    * @export
  41.    */
  42.   setManifestType(manifestType) {
  43.     // Unused.
  44.   }
  46.   /**
  47.    * @override
  48.    * @export
  49.    */
  50.   parseMedia(data, time) {
  51.     const StringUtils = shaka.util.StringUtils;
  53.     // Get the input as a string.
  54.     const strFromData = StringUtils.fromUTF8(data);
  55.     // remove dos newlines
  56.     let str = strFromData.replace(/\r+/g, '');
  57.     // trim white space start and end
  58.     str = str.trim();
  60.     /** @type {!Array<!shaka.text.Cue>} */
  61.     const cues = [];
  63.     // Supports no cues
  64.     if (str == '') {
  65.       return cues;
  66.     }
  68.     // get cues
  69.     const blocklist = str.split('\n\n');
  70.     for (const block of blocklist) {
  71.       const lines = block.split('\n');
  72.       // Parse the times.
  73.       const parser = new shaka.util.TextParser(lines[0]);
  74.       const start = parser.parseTime();
  75.       const expect = parser.readRegex(/,/g);
  76.       const end = parser.parseTime();
  78.       if (start == null || expect == null || end == null) {
  79.         throw new shaka.util.Error(
  80.             shaka.util.Error.Severity.CRITICAL,
  81.             shaka.util.Error.Category.TEXT,
  82.             shaka.util.Error.Code.INVALID_TEXT_CUE,
  83.             'Could not parse cue time range in SubViewer');
  84.       }
  86.       // Get the payload.
  87.       const payload = lines.slice(1).join('\n').trim();
  89.       const cue = new shaka.text.Cue(start, end, payload);
  90.       cues.push(cue);
  91.     }
  93.     return cues;
  94.   }
  95. };
  98. shaka.text.TextEngine.registerParser(
  99.     'text/x-subviewer', () => new shaka.text.SbvTextParser());