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236 lines
9.2 KiB
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<title>JSDoc: Source: sound/AudioClipPlayer.js</title>
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<h1 class="page-title">Source: sound/AudioClipPlayer.js</h1>
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<pre class="prettyprint source linenums"><code>/**
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* AudioClip Player.
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*
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* @author Alain Pitiot
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* @version 2021.2.0
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* @copyright (c) 2017-2020 Ilixa Ltd. (http://ilixa.com) (c) 2020-2021 Open Science Tools Ltd. (https://opensciencetools.org)
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* @license Distributed under the terms of the MIT License
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*/
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import { AudioClip } from "./AudioClip.js";
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import { SoundPlayer } from "./SoundPlayer.js";
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/**
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* <p>This class handles the playback of an audio clip, e.g. a microphone recording.</p>
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*
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* @name module:sound.AudioClipPlayer
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* @class
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* @extends SoundPlayer
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* @param {Object} options
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* @param {module:core.PsychoJS} options.psychoJS - the PsychoJS instance
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* @param {Object} options.audioClip - the module:sound.AudioClip
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* @param {number} [options.startTime= 0] - start of playback (in seconds)
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* @param {number} [options.stopTime= -1] - end of playback (in seconds)
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* @param {boolean} [options.stereo= true] whether or not to play the sound or track in stereo
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* @param {number} [options.volume= 1.0] - volume of the sound (must be between 0 and 1.0)
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* @param {number} [options.loops= 0] - how many times to repeat the track or tone after it has played *
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*/
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export class AudioClipPlayer extends SoundPlayer
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{
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constructor({
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psychoJS,
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audioClip,
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startTime = 0,
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stopTime = -1,
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stereo = true,
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volume = 0,
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loops = 0,
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} = {})
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{
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super(psychoJS);
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this._addAttribute("audioClip", audioClip);
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this._addAttribute("startTime", startTime);
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this._addAttribute("stopTime", stopTime);
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this._addAttribute("stereo", stereo);
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this._addAttribute("loops", loops);
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this._addAttribute("volume", volume);
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this._currentLoopIndex = -1;
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}
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/**
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* Determine whether this player can play the given sound.
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*
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* @name module:sound.AudioClipPlayer.accept
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* @function
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* @static
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* @public
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* @param {module:sound.Sound} sound - the sound object, which should be an AudioClip
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* @return {Object|undefined} an instance of AudioClipPlayer if sound is an AudioClip or undefined otherwise
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*/
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static accept(sound)
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{
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if (sound.value instanceof AudioClip)
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{
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// build the player:
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const player = new AudioClipPlayer({
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psychoJS: sound.psychoJS,
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audioClip: sound.value,
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startTime: sound.startTime,
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stopTime: sound.stopTime,
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stereo: sound.stereo,
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loops: sound.loops,
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volume: sound.volume,
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});
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return player;
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}
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// AudioClipPlayer is not an appropriate player for the given sound:
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return undefined;
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}
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/**
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* Get the duration of the AudioClip, in seconds.
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*
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* @name module:sound.AudioClipPlayer#getDuration
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* @function
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* @public
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* @return {number} the duration of the clip, in seconds
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*/
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getDuration()
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{
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return this._audioClip.getDuration();
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}
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/**
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* Set the duration of the audio clip.
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*
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* @name module:sound.AudioClipPlayer#setDuration
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* @function
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* @public
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* @param {number} duration_s - the duration of the clip in seconds
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*/
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setDuration(duration_s)
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{
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// TODO
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throw {
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origin: "AudioClipPlayer.setDuration",
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context: "when setting the duration of the playback for audio clip player: " + this._name,
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error: "not implemented yet",
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};
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}
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/**
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* Set the volume of the playback.
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*
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* @name module:sound.AudioClipPlayer#setVolume
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* @function
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* @public
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* @param {number} volume - the volume of the playback (must be between 0.0 and 1.0)
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* @param {boolean} [mute= false] - whether or not to mute the playback
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*/
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setVolume(volume, mute = false)
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{
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this._volume = volume;
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this._audioClip.setVolume((mute) ? 0.0 : volume);
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}
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/**
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* Set the number of loops.
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*
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* @name module:sound.AudioClipPlayer#setLoops
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* @function
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* @public
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* @param {number} loops - how many times to repeat the clip after it has played once. If loops == -1, the clip will repeat indefinitely until stopped.
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*/
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setLoops(loops)
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{
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this._loops = loops;
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this._currentLoopIndex = -1;
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// TODO
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}
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/**
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* Start playing the sound.
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*
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* @name module:sound.AudioClipPlayer#play
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* @function
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* @public
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* @param {number} loops - how many times to repeat the track after it has played once. If loops == -1, the track will repeat indefinitely until stopped.
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* @param {number} [fadeDuration = 17] - how long should the fading in last in ms
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*/
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play(loops, fadeDuration = 17)
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{
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if (typeof loops !== "undefined")
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{
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this.setLoops(loops);
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}
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// handle repeats:
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if (loops > 0)
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{
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// TODO
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}
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this._audioClip.startPlayback();
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}
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/**
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* Stop playing the sound immediately.
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*
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* @name module:sound.AudioClipPlayer#stop
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* @function
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* @public
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* @param {number} [fadeDuration = 17] - how long the fading out should last, in ms
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*/
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stop(fadeDuration = 17)
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{
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this._audioClip.stopPlayback(fadeDuration);
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}
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}
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</code></pre>
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</article>
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