mirror of
https://github.com/th-ch/youtube-music.git
synced 2026-01-11 18:41:47 +00:00
fix: remove xo, migration to eslint
This commit is contained in:
JellyBrick
@ -16,345 +16,346 @@
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*/
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(function (root) {
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"use strict";
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'use strict';
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// internal utility: check if value is a valid volume level and throw if not
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let validateVolumeLevel = (value) => {
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// number between 0 and 1?
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if (!Number.isNaN(value) && value >= 0 && value <= 1) {
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// yup, that's fine
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return;
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} else {
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// abort and throw an exception
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throw new TypeError("Number between 0 and 1 expected as volume!");
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}
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};
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// Internal utility: check if value is a valid volume level and throw if not
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const validateVolumeLevel = (value) => {
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// Number between 0 and 1?
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if (!Number.isNaN(value) && value >= 0 && value <= 1) {
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// Yup, that's fine
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// main class
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class VolumeFader {
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/**
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* VolumeFader Constructor
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*
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* @param media {HTMLMediaElement} - audio or video element to be controlled
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* @param options {Object} - an object with optional settings
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* @throws {TypeError} if options.initialVolume or options.fadeDuration are invalid
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*
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* options:
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* .logger: {Function} logging `function(stuff, …)` for execution information (default: no logging)
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* .fadeScaling: {Mixed} either 'linear', 'logarithmic' or a positive number in dB (default: logarithmic)
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* .initialVolume: {Number} media volume 0…1 to apply during setup (volume not touched by default)
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* .fadeDuration: {Number} time in milliseconds to complete a fade (default: 1000 ms)
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*/
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constructor(media, options) {
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// passed media element of correct type?
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if (media instanceof HTMLMediaElement) {
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// save reference to media element
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this.media = media;
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} else {
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// abort and throw an exception
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throw new TypeError("Media element expected!");
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}
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} else {
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// Abort and throw an exception
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throw new TypeError('Number between 0 and 1 expected as volume!');
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}
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};
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// make sure options is an object
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options = options || {};
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// Main class
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class VolumeFader {
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/**
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* VolumeFader Constructor
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*
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* @param media {HTMLMediaElement} - audio or video element to be controlled
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* @param options {Object} - an object with optional settings
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* @throws {TypeError} if options.initialVolume or options.fadeDuration are invalid
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*
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* options:
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* .logger: {Function} logging `function(stuff, …)` for execution information (default: no logging)
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* .fadeScaling: {Mixed} either 'linear', 'logarithmic' or a positive number in dB (default: logarithmic)
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* .initialVolume: {Number} media volume 0…1 to apply during setup (volume not touched by default)
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* .fadeDuration: {Number} time in milliseconds to complete a fade (default: 1000 ms)
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*/
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constructor(media, options) {
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// Passed media element of correct type?
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if (media instanceof HTMLMediaElement) {
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// Save reference to media element
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this.media = media;
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} else {
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// Abort and throw an exception
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throw new TypeError('Media element expected!');
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}
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// log function passed?
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if (typeof options.logger == "function") {
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// set log function to the one specified
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this.logger = options.logger;
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} else {
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// set log function explicitly to false
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this.logger = false;
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}
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// Make sure options is an object
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options = options || {};
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// linear volume fading?
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if (options.fadeScaling == "linear") {
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// pass levels unchanged
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this.scale = {
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internalToVolume: (level) => level,
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volumeToInternal: (level) => level,
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};
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// Log function passed?
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if (typeof options.logger === 'function') {
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// Set log function to the one specified
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this.logger = options.logger;
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} else {
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// Set log function explicitly to false
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this.logger = false;
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}
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// log setting
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this.logger && this.logger("Using linear fading.");
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}
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// no linear, but logarithmic fading…
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else {
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let dynamicRange;
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// Linear volume fading?
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if (options.fadeScaling == 'linear') {
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// Pass levels unchanged
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this.scale = {
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internalToVolume: (level) => level,
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volumeToInternal: (level) => level,
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};
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// default dynamic range?
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if (
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options.fadeScaling === undefined ||
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options.fadeScaling == "logarithmic"
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) {
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// set default of 60 dB
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dynamicRange = 3;
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}
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// custom dynamic range?
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else if (
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!Number.isNaN(options.fadeScaling) &&
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options.fadeScaling > 0
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) {
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// turn amplitude dB into a multiple of 10 power dB
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dynamicRange = options.fadeScaling / 2 / 10;
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}
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// unsupported value
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else {
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// abort and throw exception
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throw new TypeError(
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"Expected 'linear', 'logarithmic' or a positive number as fade scaling preference!"
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);
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}
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// Log setting
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this.logger && this.logger('Using linear fading.');
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}
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// No linear, but logarithmic fading…
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else {
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let dynamicRange;
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// use exponential/logarithmic scaler for expansion/compression
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this.scale = {
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internalToVolume: (level) =>
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this.exponentialScaler(level, dynamicRange),
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volumeToInternal: (level) =>
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this.logarithmicScaler(level, dynamicRange),
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};
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// Default dynamic range?
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if (
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options.fadeScaling === undefined
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|| options.fadeScaling == 'logarithmic'
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) {
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// Set default of 60 dB
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dynamicRange = 3;
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}
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// Custom dynamic range?
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else if (
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!Number.isNaN(options.fadeScaling)
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&& options.fadeScaling > 0
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) {
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// Turn amplitude dB into a multiple of 10 power dB
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dynamicRange = options.fadeScaling / 2 / 10;
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}
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// Unsupported value
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else {
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// Abort and throw exception
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throw new TypeError(
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"Expected 'linear', 'logarithmic' or a positive number as fade scaling preference!",
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);
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}
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// log setting if not default
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options.fadeScaling &&
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this.logger &&
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this.logger(
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"Using logarithmic fading with " +
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String(10 * dynamicRange) +
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" dB dynamic range."
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);
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}
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// Use exponential/logarithmic scaler for expansion/compression
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this.scale = {
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internalToVolume: (level) =>
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this.exponentialScaler(level, dynamicRange),
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volumeToInternal: (level) =>
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this.logarithmicScaler(level, dynamicRange),
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};
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// set initial volume?
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if (options.initialVolume !== undefined) {
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// validate volume level and throw if invalid
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validateVolumeLevel(options.initialVolume);
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// Log setting if not default
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options.fadeScaling
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&& this.logger
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&& this.logger(
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'Using logarithmic fading with '
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+ String(10 * dynamicRange)
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+ ' dB dynamic range.',
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);
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}
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// set initial volume
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this.media.volume = options.initialVolume;
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// Set initial volume?
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if (options.initialVolume !== undefined) {
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// Validate volume level and throw if invalid
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validateVolumeLevel(options.initialVolume);
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// log setting
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this.logger &&
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this.logger(
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"Set initial volume to " + String(this.media.volume) + "."
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);
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}
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// Set initial volume
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this.media.volume = options.initialVolume;
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// fade duration given?
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if (options.fadeDuration !== undefined) {
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// try to set given fade duration (will log if successful and throw if not)
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this.setFadeDuration(options.fadeDuration);
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} else {
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// set default fade duration (1000 ms)
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this.fadeDuration = 1000;
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}
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// Log setting
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this.logger
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&& this.logger(
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'Set initial volume to ' + String(this.media.volume) + '.',
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);
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}
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// indicate that fader is not active yet
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this.active = false;
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// Fade duration given?
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if (options.fadeDuration === undefined) {
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// Set default fade duration (1000 ms)
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this.fadeDuration = 1000;
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} else {
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// Try to set given fade duration (will log if successful and throw if not)
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this.setFadeDuration(options.fadeDuration);
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}
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// initialization done
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this.logger && this.logger("Initialized for", this.media);
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}
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// Indicate that fader is not active yet
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this.active = false;
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/**
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* Re(start) the update cycle.
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* (this.active must be truthy for volume updates to take effect)
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*
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* @return {Object} VolumeFader instance for chaining
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*/
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start() {
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// set fader to be active
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this.active = true;
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// Initialization done
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this.logger && this.logger('Initialized for', this.media);
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}
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// start by running the update method
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this.updateVolume();
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/**
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* Re(start) the update cycle.
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* (this.active must be truthy for volume updates to take effect)
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*
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* @return {Object} VolumeFader instance for chaining
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*/
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start() {
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// Set fader to be active
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this.active = true;
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// return instance for chaining
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return this;
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}
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// Start by running the update method
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this.updateVolume();
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/**
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* Stop the update cycle.
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* (interrupting any fade)
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*
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* @return {Object} VolumeFader instance for chaining
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*/
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stop() {
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// set fader to be inactive
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this.active = false;
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// Return instance for chaining
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return this;
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}
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// return instance for chaining
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return this;
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}
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/**
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* Stop the update cycle.
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* (interrupting any fade)
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*
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* @return {Object} VolumeFader instance for chaining
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*/
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stop() {
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// Set fader to be inactive
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this.active = false;
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/**
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* Set fade duration.
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* (used for future calls to fadeTo)
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*
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* @param {Number} fadeDuration - fading length in milliseconds
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* @throws {TypeError} if fadeDuration is not a number greater than zero
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* @return {Object} VolumeFader instance for chaining
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*/
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setFadeDuration(fadeDuration) {
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// if duration is a valid number > 0…
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if (!Number.isNaN(fadeDuration) && fadeDuration > 0) {
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// set fade duration
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this.fadeDuration = fadeDuration;
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// Return instance for chaining
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return this;
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}
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// log setting
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this.logger &&
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this.logger("Set fade duration to " + String(fadeDuration) + " ms.");
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} else {
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// abort and throw an exception
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throw new TypeError("Positive number expected as fade duration!");
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}
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/**
|
||||
* Set fade duration.
|
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* (used for future calls to fadeTo)
|
||||
*
|
||||
* @param {Number} fadeDuration - fading length in milliseconds
|
||||
* @throws {TypeError} if fadeDuration is not a number greater than zero
|
||||
* @return {Object} VolumeFader instance for chaining
|
||||
*/
|
||||
setFadeDuration(fadeDuration) {
|
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// If duration is a valid number > 0…
|
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if (!Number.isNaN(fadeDuration) && fadeDuration > 0) {
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// Set fade duration
|
||||
this.fadeDuration = fadeDuration;
|
||||
|
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// return instance for chaining
|
||||
return this;
|
||||
}
|
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// Log setting
|
||||
this.logger
|
||||
&& this.logger('Set fade duration to ' + String(fadeDuration) + ' ms.');
|
||||
} else {
|
||||
// Abort and throw an exception
|
||||
throw new TypeError('Positive number expected as fade duration!');
|
||||
}
|
||||
|
||||
/**
|
||||
* Define a new fade and start fading.
|
||||
*
|
||||
* @param {Number} targetVolume - level to fade to in the range 0…1
|
||||
* @param {Function} callback - (optional) function to be called when fade is complete
|
||||
* @throws {TypeError} if targetVolume is not in the range 0…1
|
||||
* @return {Object} VolumeFader instance for chaining
|
||||
*/
|
||||
fadeTo(targetVolume, callback) {
|
||||
// validate volume and throw if invalid
|
||||
validateVolumeLevel(targetVolume);
|
||||
// Return instance for chaining
|
||||
return this;
|
||||
}
|
||||
|
||||
// define new fade
|
||||
this.fade = {
|
||||
// volume start and end point on internal fading scale
|
||||
volume: {
|
||||
start: this.scale.volumeToInternal(this.media.volume),
|
||||
end: this.scale.volumeToInternal(targetVolume),
|
||||
},
|
||||
// time start and end point
|
||||
time: {
|
||||
start: Date.now(),
|
||||
end: Date.now() + this.fadeDuration,
|
||||
},
|
||||
// optional callback function
|
||||
callback: callback,
|
||||
};
|
||||
/**
|
||||
* Define a new fade and start fading.
|
||||
*
|
||||
* @param {Number} targetVolume - level to fade to in the range 0…1
|
||||
* @param {Function} callback - (optional) function to be called when fade is complete
|
||||
* @throws {TypeError} if targetVolume is not in the range 0…1
|
||||
* @return {Object} VolumeFader instance for chaining
|
||||
*/
|
||||
fadeTo(targetVolume, callback) {
|
||||
// Validate volume and throw if invalid
|
||||
validateVolumeLevel(targetVolume);
|
||||
|
||||
// start fading
|
||||
this.start();
|
||||
// Define new fade
|
||||
this.fade = {
|
||||
// Volume start and end point on internal fading scale
|
||||
volume: {
|
||||
start: this.scale.volumeToInternal(this.media.volume),
|
||||
end: this.scale.volumeToInternal(targetVolume),
|
||||
},
|
||||
// Time start and end point
|
||||
time: {
|
||||
start: Date.now(),
|
||||
end: Date.now() + this.fadeDuration,
|
||||
},
|
||||
// Optional callback function
|
||||
callback,
|
||||
};
|
||||
|
||||
// log new fade
|
||||
this.logger && this.logger("New fade started:", this.fade);
|
||||
// Start fading
|
||||
this.start();
|
||||
|
||||
// return instance for chaining
|
||||
return this;
|
||||
}
|
||||
// Log new fade
|
||||
this.logger && this.logger('New fade started:', this.fade);
|
||||
|
||||
// convenience shorthand methods for common fades
|
||||
fadeIn(callback) {
|
||||
this.fadeTo(1, callback);
|
||||
}
|
||||
fadeOut(callback) {
|
||||
this.fadeTo(0, callback);
|
||||
}
|
||||
// Return instance for chaining
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Internal: Update media volume.
|
||||
* (calls itself through requestAnimationFrame)
|
||||
*
|
||||
* @param {Number} targetVolume - linear level to fade to (0…1)
|
||||
* @param {Function} callback - (optional) function to be called when fade is complete
|
||||
*/
|
||||
updateVolume() {
|
||||
// fader active and fade available to process?
|
||||
if (this.active && this.fade) {
|
||||
// get current time
|
||||
let now = Date.now();
|
||||
// Convenience shorthand methods for common fades
|
||||
fadeIn(callback) {
|
||||
this.fadeTo(1, callback);
|
||||
}
|
||||
|
||||
// time left for fading?
|
||||
if (now < this.fade.time.end) {
|
||||
// compute current fade progress
|
||||
let progress =
|
||||
(now - this.fade.time.start) /
|
||||
(this.fade.time.end - this.fade.time.start);
|
||||
fadeOut(callback) {
|
||||
this.fadeTo(0, callback);
|
||||
}
|
||||
|
||||
// compute current level on internal scale
|
||||
let level =
|
||||
progress * (this.fade.volume.end - this.fade.volume.start) +
|
||||
this.fade.volume.start;
|
||||
/**
|
||||
* Internal: Update media volume.
|
||||
* (calls itself through requestAnimationFrame)
|
||||
*
|
||||
* @param {Number} targetVolume - linear level to fade to (0…1)
|
||||
* @param {Function} callback - (optional) function to be called when fade is complete
|
||||
*/
|
||||
updateVolume() {
|
||||
// Fader active and fade available to process?
|
||||
if (this.active && this.fade) {
|
||||
// Get current time
|
||||
const now = Date.now();
|
||||
|
||||
// map fade level to volume level and apply it to media element
|
||||
this.media.volume = this.scale.internalToVolume(level);
|
||||
// Time left for fading?
|
||||
if (now < this.fade.time.end) {
|
||||
// Compute current fade progress
|
||||
const progress
|
||||
= (now - this.fade.time.start)
|
||||
/ (this.fade.time.end - this.fade.time.start);
|
||||
|
||||
// schedule next update
|
||||
root.requestAnimationFrame(this.updateVolume.bind(this));
|
||||
} else {
|
||||
// log end of fade
|
||||
this.logger &&
|
||||
this.logger(
|
||||
"Fade to " + String(this.fade.volume.end) + " complete."
|
||||
);
|
||||
// Compute current level on internal scale
|
||||
const level
|
||||
= progress * (this.fade.volume.end - this.fade.volume.start)
|
||||
+ this.fade.volume.start;
|
||||
|
||||
// time is up, jump to target volume
|
||||
this.media.volume = this.scale.internalToVolume(this.fade.volume.end);
|
||||
// Map fade level to volume level and apply it to media element
|
||||
this.media.volume = this.scale.internalToVolume(level);
|
||||
|
||||
// set fader to be inactive
|
||||
this.active = false;
|
||||
// Schedule next update
|
||||
root.requestAnimationFrame(this.updateVolume.bind(this));
|
||||
} else {
|
||||
// Log end of fade
|
||||
this.logger
|
||||
&& this.logger(
|
||||
'Fade to ' + String(this.fade.volume.end) + ' complete.',
|
||||
);
|
||||
|
||||
// done, call back (if callable)
|
||||
typeof this.fade.callback == "function" && this.fade.callback();
|
||||
// Time is up, jump to target volume
|
||||
this.media.volume = this.scale.internalToVolume(this.fade.volume.end);
|
||||
|
||||
// clear fade
|
||||
this.fade = undefined;
|
||||
}
|
||||
}
|
||||
}
|
||||
// Set fader to be inactive
|
||||
this.active = false;
|
||||
|
||||
/**
|
||||
* Internal: Exponential scaler with dynamic range limit.
|
||||
*
|
||||
* @param {Number} input - logarithmic input level to be expanded (float, 0…1)
|
||||
* @param {Number} dynamicRange - expanded output range, in multiples of 10 dB (float, 0…∞)
|
||||
* @return {Number} - expanded level (float, 0…1)
|
||||
*/
|
||||
exponentialScaler(input, dynamicRange) {
|
||||
// special case: make zero (or any falsy input) return zero
|
||||
if (input == 0) {
|
||||
// since the dynamic range is limited,
|
||||
// allow a zero to produce a plain zero instead of a small faction
|
||||
// (audio would not be recognized as silent otherwise)
|
||||
return 0;
|
||||
} else {
|
||||
// scale 0…1 to minus something × 10 dB
|
||||
input = (input - 1) * dynamicRange;
|
||||
// Done, call back (if callable)
|
||||
typeof this.fade.callback === 'function' && this.fade.callback();
|
||||
|
||||
// compute power of 10
|
||||
return Math.pow(10, input);
|
||||
}
|
||||
}
|
||||
// Clear fade
|
||||
this.fade = undefined;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Internal: Logarithmic scaler with dynamic range limit.
|
||||
*
|
||||
* @param {Number} input - exponential input level to be compressed (float, 0…1)
|
||||
* @param {Number} dynamicRange - coerced input range, in multiples of 10 dB (float, 0…∞)
|
||||
* @return {Number} - compressed level (float, 0…1)
|
||||
*/
|
||||
logarithmicScaler(input, dynamicRange) {
|
||||
// special case: make zero (or any falsy input) return zero
|
||||
if (input == 0) {
|
||||
// logarithm of zero would be -∞, which would map to zero anyway
|
||||
return 0;
|
||||
} else {
|
||||
// compute base-10 logarithm
|
||||
input = Math.log10(input);
|
||||
/**
|
||||
* Internal: Exponential scaler with dynamic range limit.
|
||||
*
|
||||
* @param {Number} input - logarithmic input level to be expanded (float, 0…1)
|
||||
* @param {Number} dynamicRange - expanded output range, in multiples of 10 dB (float, 0…∞)
|
||||
* @return {Number} - expanded level (float, 0…1)
|
||||
*/
|
||||
exponentialScaler(input, dynamicRange) {
|
||||
// Special case: make zero (or any falsy input) return zero
|
||||
if (input == 0) {
|
||||
// Since the dynamic range is limited,
|
||||
// allow a zero to produce a plain zero instead of a small faction
|
||||
// (audio would not be recognized as silent otherwise)
|
||||
return 0;
|
||||
}
|
||||
|
||||
// scale minus something × 10 dB to 0…1 (clipping at 0)
|
||||
return Math.max(1 + input / dynamicRange, 0);
|
||||
}
|
||||
}
|
||||
}
|
||||
// Scale 0…1 to minus something × 10 dB
|
||||
input = (input - 1) * dynamicRange;
|
||||
|
||||
// export class to root scope
|
||||
root.VolumeFader = VolumeFader;
|
||||
// Compute power of 10
|
||||
return 10 ** input;
|
||||
}
|
||||
|
||||
/**
|
||||
* Internal: Logarithmic scaler with dynamic range limit.
|
||||
*
|
||||
* @param {Number} input - exponential input level to be compressed (float, 0…1)
|
||||
* @param {Number} dynamicRange - coerced input range, in multiples of 10 dB (float, 0…∞)
|
||||
* @return {Number} - compressed level (float, 0…1)
|
||||
*/
|
||||
logarithmicScaler(input, dynamicRange) {
|
||||
// Special case: make zero (or any falsy input) return zero
|
||||
if (input == 0) {
|
||||
// Logarithm of zero would be -∞, which would map to zero anyway
|
||||
return 0;
|
||||
}
|
||||
|
||||
// Compute base-10 logarithm
|
||||
input = Math.log10(input);
|
||||
|
||||
// Scale minus something × 10 dB to 0…1 (clipping at 0)
|
||||
return Math.max(1 + input / dynamicRange, 0);
|
||||
}
|
||||
}
|
||||
|
||||
// Export class to root scope
|
||||
root.VolumeFader = VolumeFader;
|
||||
})(window);
|
||||
|
||||
Reference in New Issue
Block a user