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AudioPlayer.js.html
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<h1 class="page-title">Source: AudioPlayer.js</h1>
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<article>
<pre
class="sunlight-highlight-javascript linenums">import { addSignals } from './Signals.js'
/**
* Class representing an audio player with playback control capabilities.
* Supports playing, pausing, resuming, and stopping audio files with volume control
* and playback speed adjustment.
*/
class AudioPlayer {
/**
* Creates an instance of AudioPlayer.
* Initializes the player with default settings and sets up signal handling for the 'ended' event.
*/
constructor() {
this.audio = null;
this.isPlaying = false;
this.isPaused = false;
this.isMuted = false;
this.previousVolume = 1.0;
this.playStartTime = null;
this.playDuration = 0;
addSignals(AudioPlayer, 'ended');
}
/**
* Plays an audio file with optional playback speed adjustment.
* If audio is paused, it will resume playback instead of starting a new file.
*
* @param {string} audioFile - The path or URL to the audio file.
* @param {number} [speed=1.0] - Playback speed multiplier (1.0 is normal speed).
* @returns {Promise<void>} Resolves when the audio playback completes.
*/
async play(audioFile, speed = 1.0) {
if (!this.isPlaying && !this.isPaused) {
this.audio = new Audio(audioFile);
this.audio.playbackRate = speed;
this.audio.volume = this.previousVolume;
this.isPlaying = true;
this.isPaused = false;
this.playStartTime = Date.now();
this.playDuration = 0;
this.onEndedListener = () => {
this.isPlaying = false;
this.updatePlayDuration();
this.emit('ended');
// Remove the listener
this.audio.removeEventListener('ended', this.onEndedListener);
this.onEndedListener = null;
};
this.audio.addEventListener('ended', this.onEndedListener);
await this.audio.play();
return new Promise((resolve) => {
this.audio.onended = () => {
this.isPlaying = false;
resolve();
};
});
} else if (this.isPaused) {
await this.continue();
}
}
/**
* Pauses the currently playing audio.
* Updates play duration when pausing.
*/
pause() {
if (!this.isPaused && this.audio) {
this.audio.pause();
this.isPaused = true;
this.updatePlayDuration();
}
}
/**
* Resumes playback of a paused audio file.
*
* @returns {Promise<void>} Resolves when the resumed audio playback completes.
*/
async continue() {
if (this.isPaused && this.audio) {
this.isPaused = false;
this.playStartTime = Date.now();
await this.audio.play();
return new Promise((resolve) => {
this.audio.onended = () => {
this.isPlaying = false;
resolve();
};
});
} else {
console.log("No paused audio to continue.");
}
}
/**
* Stops the current audio playback and resets all player states.
* Removes event listeners and updates final play duration.
*/
stop() {
if (this.audio) {
this.audio.pause();
this.audio.currentTime = 0;
if (this.onEndedListener) {
this.audio.removeEventListener('ended', this.onEndedListener);
this.onEndedListener = null;
}
this.isPlaying = false;
this.isPaused = false;
this.isMuted = false;
this.updatePlayDuration();
}
}
/**
* Updates the total play duration based on the current session.
* Called internally when playback is paused, stopped, or ends.
* @private
*/
updatePlayDuration() {
if (this.playStartTime) {
const now = Date.now();
this.playDuration += now - this.playStartTime;
this.playStartTime = null;
}
}
/**
* Returns the total play duration in milliseconds.
*
* @returns {number} Total play duration in milliseconds.
*/
getPlayDuration() {
return this.playDuration;
}
/**
* Sets the audio volume level.
*
* @param {number} volume - Volume level between 0.0 and 1.0.
*/
setVolume(volume) {
if (this.audio) {
if (volume >= 0 && volume <= 1) {
this.audio.volume = volume;
this.previousVolume = volume;
} else {
console.log("Volume must be between 0.0 and 1.0");
}
} else {
console.log("No audio loaded.");
}
}
/**
* Creates a delay in the execution flow.
*
* @param {number} ms - Number of milliseconds to wait.
* @returns {Promise<void>} Resolves after the specified delay.
*/
async silence(ms) {
return new Promise((resolve) => setTimeout(resolve, ms));
}
/**
* Toggles the mute state of the audio player.
* Stores the previous volume level when muting and restores it when unmuting.
*/
toggleMute() {
if (this.audio) {
if (this.isMuted) {
this.audio.volume = this.previousVolume;
this.isMuted = false;
} else {
this.previousVolume = this.audio.volume;
this.audio.volume = 0;
this.isMuted = true;
}
} else {
console.log("No audio loaded.");
}
}
}
export { AudioPlayer }</pre>
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