@pixi/sound/lib/filters/EqualizerFilter.mjs.map

WebAudio API playback library with filters

{"version":3,"file":"EqualizerFilter.mjs","sources":["../../src/filters/EqualizerFilter.ts"],"sourcesContent":["import { getInstance } from '../instance';\nimport { WebAudioUtils } from '../webaudio/WebAudioUtils';\nimport { Filter } from './Filter';\n\ninterface Band\n{\n    f: number;\n    type: string;\n    gain: number;\n}\n\n/**\n * Filter for adding equalizer bands.\n *\n * @memberof filters\n */\nclass EqualizerFilter extends Filter\n{\n    /**\n     * Band at 32 Hz\n     * @readonly\n     */\n    public static readonly F32: number = 32;\n\n    /**\n     * Band at 64 Hz\n     * @readonly\n     */\n    public static readonly F64: number = 64;\n\n    /**\n     * Band at 125 Hz\n     * @readonly\n     */\n    public static readonly F125: number = 125;\n\n    /**\n     * Band at 250 Hz\n     * @readonly\n     */\n    public static readonly F250: number = 250;\n\n    /**\n     * Band at 500 Hz\n     * @readonly\n     */\n    public static readonly F500: number = 500;\n\n    /**\n     * Band at 1000 Hz\n     * @readonly\n     */\n    public static readonly F1K: number = 1000;\n\n    /**\n     * Band at 2000 Hz\n     * @readonly\n     */\n    public static readonly F2K: number = 2000;\n\n    /**\n     * Band at 4000 Hz\n     * @readonly\n     */\n    public static readonly F4K: number = 4000;\n\n    /**\n     * Band at 8000 Hz\n     * @readonly\n     */\n    public static readonly F8K: number = 8000;\n\n    /**\n     * Band at 16000 Hz\n     * @readonly\n     */\n    public static readonly F16K: number = 16000;\n\n    /**\n     * The list of bands\n     * @readonly\n     */\n    public readonly bands: BiquadFilterNode[];\n\n    /**\n     * The map of bands to frequency\n     * @readonly\n     */\n    public readonly bandsMap: Record<number, BiquadFilterNode>;\n\n    /**\n     * @param f32 - Default gain for 32 Hz\n     * @param f64 - Default gain for 64 Hz\n     * @param f125 - Default gain for 125 Hz\n     * @param f250 - Default gain for 250 Hz\n     * @param f500 - Default gain for 500 Hz\n     * @param f1k - Default gain for 1000 Hz\n     * @param f2k - Default gain for 2000 Hz\n     * @param f4k - Default gain for 4000 Hz\n     * @param f8k - Default gain for 8000 Hz\n     * @param f16k - Default gain for 16000 Hz\n     */\n    constructor(f32 = 0, f64 = 0, f125 = 0, f250 = 0, f500 = 0,\n        f1k = 0, f2k = 0, f4k = 0, f8k = 0, f16k = 0)\n    {\n        let bands: BiquadFilterNode[] = [];\n\n        const equalizerBands: Band[] = [\n            {\n                f: EqualizerFilter.F32,\n                type: 'lowshelf',\n                gain: f32,\n            },\n            {\n                f: EqualizerFilter.F64,\n                type: 'peaking',\n                gain: f64,\n            },\n            {\n                f: EqualizerFilter.F125,\n                type: 'peaking',\n                gain: f125,\n            },\n            {\n                f: EqualizerFilter.F250,\n                type: 'peaking',\n                gain: f250,\n            },\n            {\n                f: EqualizerFilter.F500,\n                type: 'peaking',\n                gain: f500,\n            },\n            {\n                f: EqualizerFilter.F1K,\n                type: 'peaking',\n                gain: f1k,\n            },\n            {\n                f: EqualizerFilter.F2K,\n                type: 'peaking',\n                gain: f2k,\n            },\n            {\n                f: EqualizerFilter.F4K,\n                type: 'peaking',\n                gain: f4k,\n            },\n            {\n                f: EqualizerFilter.F8K,\n                type: 'peaking',\n                gain: f8k,\n            },\n            {\n                f: EqualizerFilter.F16K,\n                type: 'highshelf',\n                gain: f16k,\n            },\n        ];\n\n        if (!getInstance().useLegacy)\n        {\n            bands = equalizerBands.map((band: Band) =>\n            {\n                const node: BiquadFilterNode = getInstance().context.audioContext.createBiquadFilter();\n\n                node.type = band.type as BiquadFilterType;\n                WebAudioUtils.setParamValue(node.Q, 1);\n                node.frequency.value = band.f; // WebAudioUtils.setParamValue(filter.frequency, band.f);\n                WebAudioUtils.setParamValue(node.gain, band.gain);\n\n                return node;\n            });\n        }\n\n        // Setup the constructor AudioNode, where first is the input, and last is the output\n        super(bands[0], bands[bands.length - 1]);\n\n        // Manipulate the bands\n        this.bands = bands;\n\n        // Create a map\n        this.bandsMap = {};\n\n        for (let i = 0; i < this.bands.length; i++)\n        {\n            const node: BiquadFilterNode = this.bands[i];\n\n            // Connect the previous band to the current one\n            if (i > 0)\n            {\n                this.bands[i - 1].connect(node);\n            }\n            this.bandsMap[node.frequency.value] = node;\n        }\n    }\n\n    /**\n     * Set gain on a specific frequency.\n     * @param frequency - The frequency, see EqualizerFilter.F* for bands\n     * @param gain - Recommended -40 to 40.\n     */\n    public setGain(frequency: number, gain = 0): void\n    {\n        if (!this.bandsMap[frequency])\n        {\n            throw new Error(`No band found for frequency ${frequency}`);\n        }\n        WebAudioUtils.setParamValue(this.bandsMap[frequency].gain, gain);\n    }\n\n    /**\n     * Get gain amount on a specific frequency.\n     * @return The amount of gain set.\n     */\n    public getGain(frequency: number): number\n    {\n        if (!this.bandsMap[frequency])\n        {\n            throw new Error(`No band found for frequency ${frequency}`);\n        }\n\n        return this.bandsMap[frequency].gain.value;\n    }\n\n    /**\n     * Gain at 32 Hz frequencey.\n     * @default 0\n     */\n    public set f32(value: number)\n    {\n        this.setGain(EqualizerFilter.F32, value);\n    }\n    public get f32(): number\n    {\n        return this.getGain(EqualizerFilter.F32);\n    }\n\n    /**\n     * Gain at 64 Hz frequencey.\n     * @default 0\n     */\n    public set f64(value: number)\n    {\n        this.setGain(EqualizerFilter.F64, value);\n    }\n    public get f64(): number\n    {\n        return this.getGain(EqualizerFilter.F64);\n    }\n\n    /**\n     * Gain at 125 Hz frequencey.\n     * @default 0\n     */\n    public set f125(value: number)\n    {\n        this.setGain(EqualizerFilter.F125, value);\n    }\n    public get f125(): number\n    {\n        return this.getGain(EqualizerFilter.F125);\n    }\n\n    /**\n     * Gain at 250 Hz frequencey.\n     * @default 0\n     */\n    public set f250(value: number)\n    {\n        this.setGain(EqualizerFilter.F250, value);\n    }\n    public get f250(): number\n    {\n        return this.getGain(EqualizerFilter.F250);\n    }\n\n    /**\n     * Gain at 500 Hz frequencey.\n     * @default 0\n     */\n    public set f500(value: number)\n    {\n        this.setGain(EqualizerFilter.F500, value);\n    }\n    public get f500(): number\n    {\n        return this.getGain(EqualizerFilter.F500);\n    }\n\n    /**\n     * Gain at 1 KHz frequencey.\n     * @default 0\n     */\n    public set f1k(value: number)\n    {\n        this.setGain(EqualizerFilter.F1K, value);\n    }\n    public get f1k(): number\n    {\n        return this.getGain(EqualizerFilter.F1K);\n    }\n\n    /**\n     * Gain at 2 KHz frequencey.\n     * @default 0\n     */\n    public set f2k(value: number)\n    {\n        this.setGain(EqualizerFilter.F2K, value);\n    }\n    public get f2k(): number\n    {\n        return this.getGain(EqualizerFilter.F2K);\n    }\n\n    /**\n     * Gain at 4 KHz frequencey.\n     * @default 0\n     */\n    public set f4k(value: number)\n    {\n        this.setGain(EqualizerFilter.F4K, value);\n    }\n    public get f4k(): number\n    {\n        return this.getGain(EqualizerFilter.F4K);\n    }\n\n    /**\n     * Gain at 8 KHz frequencey.\n     * @default 0\n     */\n    public set f8k(value: number)\n    {\n        this.setGain(EqualizerFilter.F8K, value);\n    }\n    public get f8k(): number\n    {\n        return this.getGain(EqualizerFilter.F8K);\n    }\n\n    /**\n     * Gain at 16 KHz frequencey.\n     * @default 0\n     */\n    public set f16k(value: number)\n    {\n        this.setGain(EqualizerFilter.F16K, value);\n    }\n    public get f16k(): number\n    {\n        return this.getGain(EqualizerFilter.F16K);\n    }\n\n    /** Reset all frequency bands to have gain of 0 */\n    public reset(): void\n    {\n        this.bands.forEach((band: BiquadFilterNode) =>\n        {\n            WebAudioUtils.setParamValue(band.gain, 0);\n        });\n    }\n\n    public destroy(): void\n    {\n        this.bands.forEach((band: BiquadFilterNode) =>\n        {\n            band.disconnect();\n        });\n        (this as any).bands = null;\n        (this as any).bandsMap = null;\n    }\n}\n\nexport { EqualizerFilter 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