@pixi/sound/lib/webaudio/WebAudioInstance.mjs.map

WebAudio API playback library with filters

{"version":3,"file":"WebAudioInstance.mjs","sources":["../../src/webaudio/WebAudioInstance.ts"],"sourcesContent":["import { EventEmitter, Ticker } from 'pixi.js';\nimport { Filter } from '../filters/Filter';\nimport { IMediaInstance } from '../interfaces';\nimport { PlayOptions } from '../Sound';\nimport { WebAudioMedia } from './WebAudioMedia';\nimport { WebAudioUtils } from './WebAudioUtils';\n\nlet id = 0;\n\n/**\n * A single play instance that handles the AudioBufferSourceNode.\n * @memberof webaudio\n * @extends PIXI.EventEmitter\n */\nclass WebAudioInstance extends EventEmitter implements IMediaInstance\n{\n    /**\n     * The current unique ID for this instance.\n     * @readonly\n     */\n    public readonly id: number;\n\n    /** The source Sound. */\n    private _media: WebAudioMedia;\n\n    /** true if paused. */\n    private _paused: boolean;\n\n    /** true if muted. */\n    private _muted: boolean;\n\n    /** true if paused. */\n    private _pausedReal: boolean;\n\n    /** The instance volume */\n    private _volume: number;\n\n    /** Last update frame number. */\n    private _lastUpdate: number;\n\n    /** The total number of seconds elapsed in playback. */\n    private _elapsed: number;\n\n    /** Playback rate, where 1 is 100%. */\n    private _speed: number;\n\n    /** Playback rate, where 1 is 100%. */\n    private _end: number;\n\n    /** `true` if should be looping. */\n    private _loop: boolean;\n\n    /** Gain node for controlling volume of instance */\n    private _gain: GainNode;\n\n    /** Length of the sound in seconds. */\n    private _duration: number;\n\n    /** The progress of the sound from 0 to 1. */\n    private _progress: number;\n\n    /** Audio buffer source clone from Sound object. */\n    private _source: AudioBufferSourceNode;\n\n    /** The filters */\n    private _filters: Filter[];\n\n    constructor(media: WebAudioMedia)\n    {\n        super();\n\n        this.id = id++;\n        this._media = null;\n        this._paused = false;\n        this._muted = false;\n        this._elapsed = 0;\n\n        // Initialize\n        this.init(media);\n    }\n\n    /**\n     * Set a property by name, this makes it easy to chain values\n     * @param name - Name of the property to set.\n     * @param value - Value to set property to.\n     */\n    public set(name: 'speed' | 'volume' | 'muted' | 'loop' | 'paused', value: number | boolean): this\n    {\n        if (this[name] === undefined)\n        {\n            throw new Error(`Property with name ${name} does not exist.`);\n        }\n        else\n        {\n            switch (name)\n            {\n                case 'speed': this.speed = value as number; break;\n                case 'volume': this.volume = value as number; break;\n                case 'muted': this.muted = value as boolean; break;\n                case 'loop': this.loop = value as boolean; break;\n                case 'paused': this.paused = value as boolean; break;\n            }\n        }\n\n        return this;\n    }\n\n    /** Stops the instance, don't use after this. */\n    public stop(): void\n    {\n        if (this._source)\n        {\n            this._internalStop();\n            this.emit('stop');\n        }\n    }\n\n    /** Set the instance speed from 0 to 1 */\n    public get speed(): number\n    {\n        return this._speed;\n    }\n    public set speed(speed: number)\n    {\n        this._speed = speed;\n        this.refresh();\n        this._update(true); // update progress\n    }\n\n    /** Get the set the volume for this instance from 0 to 1 */\n    public get volume(): number\n    {\n        return this._volume;\n    }\n    public set volume(volume: number)\n    {\n        this._volume = volume;\n        this.refresh();\n    }\n\n    /** `true` if the sound is muted */\n    public get muted(): boolean\n    {\n        return this._muted;\n    }\n    public set muted(muted: boolean)\n    {\n        this._muted = muted;\n        this.refresh();\n    }\n\n    /** If the sound instance should loop playback */\n    public get loop(): boolean\n    {\n        return this._loop;\n    }\n    public set loop(loop: boolean)\n    {\n        this._loop = loop;\n        this.refresh();\n    }\n\n    /** The collection of filters. */\n    public get filters(): Filter[]\n    {\n        return this._filters;\n    }\n    public set filters(filters: Filter[])\n    {\n        if (this._filters)\n        {\n            this._filters?.filter((filter) => filter).forEach((filter) => filter.disconnect());\n            this._filters = null;\n            // Reconnect direct path\n            this._source.connect(this._gain);\n        }\n        this._filters = filters?.length ? filters.slice(0) : null;\n        this.refresh();\n    }\n\n    /** Refresh loop, volume and speed based on changes to parent */\n    public refresh(): void\n    {\n        // Sound could be paused\n        if (!this._source)\n        {\n            return;\n        }\n        const global = this._media.context;\n        const sound = this._media.parent;\n\n        // Updating looping\n        this._source.loop = this._loop || sound.loop;\n\n        // Update the volume\n        const globalVolume = global.volume * (global.muted ? 0 : 1);\n        const soundVolume = sound.volume * (sound.muted ? 0 : 1);\n        const instanceVolume = this._volume * (this._muted ? 0 : 1);\n\n        WebAudioUtils.setParamValue(this._gain.gain, instanceVolume * soundVolume * globalVolume);\n\n        // Update the speed\n        WebAudioUtils.setParamValue(this._source.playbackRate, this._speed * sound.speed * global.speed);\n\n        this.applyFilters();\n    }\n\n    /** Connect filters nodes to audio context */\n    private applyFilters(): void\n    {\n        if (this._filters?.length)\n        {\n            // Disconnect direct path before inserting filters\n            this._source.disconnect();\n\n            // Connect each filter\n            let source: { connect: (node: AudioNode) => void } = this._source;\n\n            this._filters.forEach((filter: Filter) =>\n            {\n                source.connect(filter.destination);\n                source = filter;\n            });\n            source.connect(this._gain);\n        }\n    }\n\n    /** Handle changes in paused state, either globally or sound or instance */\n    public refreshPaused(): void\n    {\n        const global = this._media.context;\n        const sound = this._media.parent;\n\n        // Consider global and sound paused\n        const pausedReal = this._paused || sound.paused || global.paused;\n\n        if (pausedReal !== this._pausedReal)\n        {\n            this._pausedReal = pausedReal;\n\n            if (pausedReal)\n            {\n                // pause the sounds\n                this._internalStop();\n\n                /**\n                 * The sound is paused.\n                 * @event paused\n                 */\n                this.emit('paused');\n            }\n            else\n            {\n                /**\n                 * The sound is unpaused.\n                 * @event resumed\n                 */\n                this.emit('resumed');\n\n                // resume the playing with offset\n                this.play({\n                    start: this._elapsed % this._duration,\n                    end: this._end,\n                    speed: this._speed,\n                    loop: this._loop,\n                    volume: this._volume,\n                });\n            }\n\n            /**\n             * The sound is paused or unpaused.\n             * @event pause\n             * @property {boolean} paused - If the instance was paused or not.\n             */\n            this.emit('pause', pausedReal);\n        }\n    }\n\n    /**\n     * Plays the sound.\n     * @param options - Play options.\n     */\n    public play(options: PlayOptions): void\n    {\n        const { start, end, speed, loop, volume, muted, filters } = options;\n\n        if (end)\n        {\n            // eslint-disable-next-line no-console\n            console.assert(end > start, 'End time is before start time');\n        }\n        this._paused = false;\n        const { source, gain } = this._media.nodes.cloneBufferSource();\n\n        this._source = source;\n        this._gain = gain;\n        this._speed = speed;\n        this._volume = volume;\n        this._loop = !!loop;\n        this._muted = muted;\n        this._filters = filters;\n        this.refresh();\n\n        const duration: number = this._source.buffer.duration;\n\n        this._duration = duration;\n        this._end = end;\n        this._lastUpdate = this._now();\n        this._elapsed = start;\n        this._source.onended = this._onComplete.bind(this);\n\n        if (this._loop)\n        {\n            this._source.loopEnd = end;\n            this._source.loopStart = start;\n            this._source.start(0, start);\n        }\n        else if (end)\n        {\n            this._source.start(0, start, end - start);\n        }\n        else\n        {\n            this._source.start(0, start);\n        }\n\n        /**\n         * The sound is started.\n         * @event start\n         */\n        this.emit('start');\n\n        // Do an update for the initial progress\n        this._update(true);\n\n        // Start handling internal ticks\n        this.enableTicker(true);\n    }\n\n    /** Start the update progress. */\n    private enableTicker(enabled: boolean): void\n    {\n        Ticker.shared.remove(this._updateListener, this);\n        if (enabled)\n        {\n            Ticker.shared.add(this._updateListener, this);\n        }\n    }\n\n    /** The current playback progress from 0 to 1. */\n    public get progress(): number\n    {\n        return this._progress;\n    }\n\n    /** Pauses the sound. */\n    public get paused(): boolean\n    {\n        return this._paused;\n    }\n\n    public set paused(paused: boolean)\n    {\n        this._paused = paused;\n        this.refreshPaused();\n    }\n\n    /** Don't use after this. */\n    public destroy(): void\n    {\n        this.removeAllListeners();\n        this._internalStop();\n        if (this._gain)\n        {\n            this._gain.disconnect();\n            this._gain = null;\n        }\n        if (this._media)\n        {\n            this._media.context.events.off('refresh', this.refresh, this);\n            this._media.context.events.off('refreshPaused', this.refreshPaused, this);\n            this._media = null;\n        }\n        this._filters?.forEach((filter) => filter.disconnect());\n        this._filters = null;\n        this._end = null;\n        this._speed = 1;\n        this._volume = 1;\n        this._loop = false;\n        this._elapsed = 0;\n        this._duration = 0;\n        this._paused = false;\n        this._muted = false;\n        this._pausedReal = false;\n    }\n\n    /**\n     * To string method for instance.\n     * @return The string representation of instance.\n     */\n    public toString(): string\n    {\n        return `[WebAudioInstance id=${this.id}]`;\n    }\n\n    /**\n     * Get the current time in seconds.\n     * @return Seconds since start of context\n     */\n    private _now(): number\n    {\n        return this._media.context.audioContext.currentTime;\n    }\n\n    /** Callback for update listener */\n    private _updateListener()\n    {\n        this._update();\n    }\n\n    /** Internal update the progress. */\n    private _update(force = false): void\n    {\n        if (this._source)\n        {\n            const now: number = this._now();\n            const delta: number = now - this._lastUpdate;\n\n            if (delta > 0 || force)\n            {\n                const speed: number = this._source.playbackRate.value;\n\n                this._elapsed += delta * speed;\n                this._lastUpdate = now;\n                const duration: number = this._duration;\n                let progress: number;\n\n                if (this._source.loopStart)\n                {\n                    const soundLength = this._source.loopEnd - this._source.loopStart;\n\n                    progress = (this._source.loopStart + (this._elapsed % soundLength)) / duration;\n                }\n                else\n                {\n                    progress = (this._elapsed % duration) / duration;\n                }\n\n                // Update the progress\n                this._progress = progress;\n\n                /**\n                 * The sound progress is updated.\n                 * @event progress\n                 * @property {number} progress - Amount progressed from 0 to 1\n                 * @property {number} duration - The total playback in seconds\n                 */\n                this.emit('progress', this._progress, duration);\n            }\n        }\n    }\n\n    /** Initializes the instance. */\n    public init(media: WebAudioMedia): void\n    {\n        this._media = media;\n        media.context.events.on('refresh', this.refresh, this);\n        media.context.events.on('refreshPaused', this.refreshPaused, this);\n    }\n\n    /** Stops the instance. */\n    private _internalStop(): void\n    {\n        if (this._source)\n        {\n            this.enableTicker(false);\n            this._source.onended = null;\n            this._source.stop(0); // param needed for iOS 8 bug\n            this._source.disconnect();\n            try\n            {\n                this._source.buffer = null;\n            }\n            catch (err)\n            {\n                // try/catch workaround for bug in older Chrome versions\n                console.warn('Failed to set AudioBufferSourceNode.buffer to null:', err);\n            }\n            this._source = null;\n        }\n    }\n\n    /** Callback when completed. */\n    private _onComplete(): void\n    {\n        if (this._source)\n        {\n            this.enableTicker(false);\n            this._source.onended = null;\n            this._source.disconnect();\n            try\n            {\n                this._source.buffer = null;\n            }\n            catch (err)\n            {\n                // try/catch workaround for bug in older Chrome versions\n                console.warn('Failed to set AudioBufferSourceNode.buffer to null:', err);\n            }\n        }\n        this._source = null;\n        this._progress = 1;\n        this.emit('progress', 1, this._duration);\n        /**\n         * The sound ends, don't use after this\n         * @event end\n         */\n        this.emit('end', this);\n    }\n}\n\nexport { WebAudioInstance 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