benbang/packages/griffith-utils/cjs/index.js

benbang Video Player

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

const logger = {
  DEBUG: 'debug',
  INFO: 'info',
  WARN: 'warn',
  ERROR: 'error',

  log(level, message, ...params) {
    /* eslint-disable no-console */
    const method = console[level] ? level : 'log';
    console[method]('[griffith] ' + message, ...params);
    /* eslint-enable no-console */
  },

  debug(...args) {
    this.log(this.DEBUG, ...args);
  },

  info(...args) {
    this.log(this.INFO, ...args);
  },

  warn(...args) {
    this.log(this.WARN, ...args);
  },

  error(...args) {
    this.log(this.ERROR, ...args);
  }

};

const isMobile = /iPhone|iPad|iPod|Android/i.test(navigator.userAgent);
const isAndroid = /(android)/i.test(navigator.userAgent);
const isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
var ua = {
  isMobile,
  isAndroid,
  isSafari
};

/**
 * Copied from https://github.com/video-dev/hls.js/blob/master/src/is-supported.js
 */
function getMediaSource() {
  if (typeof window !== 'undefined') {
    return window.MediaSource || window.WebKitMediaSource;
  }
}

function isMSESupported() {
  const mediaSource = getMediaSource();
  const sourceBuffer = window.SourceBuffer || window.WebKitSourceBuffer;
  const isTypeSupported = mediaSource && typeof mediaSource.isTypeSupported === 'function' && mediaSource.isTypeSupported('video/mp4; codecs="avc1.42E01E,mp4a.40.2"');
  const sourceBufferValidAPI = !sourceBuffer || sourceBuffer.prototype && typeof sourceBuffer.prototype.appendBuffer === 'function' && typeof sourceBuffer.prototype.remove === 'function';
  return !!isTypeSupported && !!sourceBufferValidAPI;
}

function isHlsNativeSupported() {
  const video = document.createElement('video');
  return Boolean(video.canPlayType('application/vnd.apple.mpegURL'));
}

/**
 * 获得最大公约数
 * @param {number} a
 * @param {number} b
 */
function getGCD(a, b) {
  if (!Number.isInteger(a) || !Number.isInteger(b)) {
    throw new Error('params must be interger number');
  }

  if (a === 0) {
    return Math.abs(b);
  }

  if (b === 0) {
    return Math.abs(a);
  }

  return getGCD(b, a % b);
}
/**
 * 约分
 * @param {number} a
 * @param {number} b
 */

function reduce(a, b) {
  if (a === 0 || b === 0) {
    throw new Error('params must not be zero');
  }

  const gcd = getGCD(a, b);
  return [a / gcd, b / gcd];
}

function sequence(...fns) {
  return (...args) => fns.reduce((_, fn) => fn(...args), null);
}

exports.getGCD = getGCD;
exports.isHlsNativeSupported = isHlsNativeSupported;
exports.isMSESupported = isMSESupported;
exports.logger = logger;
exports.reduce = reduce;
exports.sequence = sequence;
exports.ua = ua;
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