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/* |
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* Copyright (c) 2017-2019 Rafael da Silva Rocha. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the |
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* "Software"), to deal in the Software without restriction, including |
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* without limitation the rights to use, copy, modify, merge, publish, |
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* distribute, sublicense, and/or sell copies of the Software, and to |
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* permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be |
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* included in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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* |
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*/ |
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/** |
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* @fileoverview The WaveFile class. |
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* @see https://github.com/rochars/wavefile |
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*/ |
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/** @module wavefile */ |
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import {encode, decode} from 'base64-arraybuffer-es6'; |
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import WaveFileConverter from './lib/wavefile-converter'; |
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/** |
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* A class to manipulate wav files. |
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* @extends WaveFileConverter |
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*/ |
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export default class WaveFile extends WaveFileConverter { |
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/** |
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* @param {?Uint8Array=} wavBuffer A wave file buffer. |
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* @throws {Error} If container is not RIFF, RIFX or RF64. |
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* @throws {Error} If format is not WAVE. |
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* @throws {Error} If no 'fmt ' chunk is found. |
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* @throws {Error} If no 'data' chunk is found. |
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*/ |
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constructor(wavBuffer=null) { |
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super(); |
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if (wavBuffer) { |
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this.fromBuffer(wavBuffer); |
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} |
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} |
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/** |
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* Use a .wav file encoded as a base64 string to load the WaveFile object. |
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* @param {string} base64String A .wav file as a base64 string. |
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* @throws {Error} If any property of the object appears invalid. |
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*/ |
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fromBase64(base64String) { |
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this.fromBuffer(new Uint8Array(decode(base64String))); |
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} |
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/** |
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* Return a base64 string representig the WaveFile object as a .wav file. |
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* @return {string} A .wav file as a base64 string. |
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* @throws {Error} If any property of the object appears invalid. |
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*/ |
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toBase64() { |
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/** @type {!Uint8Array} */ |
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let buffer = this.toBuffer(); |
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return encode(buffer, 0, buffer.length); |
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} |
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/** |
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* Return a DataURI string representig the WaveFile object as a .wav file. |
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* The return of this method can be used to load the audio in browsers. |
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* @return {string} A .wav file as a DataURI. |
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* @throws {Error} If any property of the object appears invalid. |
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*/ |
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toDataURI() { |
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return 'data:audio/wav;base64,' + this.toBase64(); |
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} |
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/** |
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* Use a .wav file encoded as a DataURI to load the WaveFile object. |
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* @param {string} dataURI A .wav file as DataURI. |
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* @throws {Error} If any property of the object appears invalid. |
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*/ |
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fromDataURI(dataURI) { |
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this.fromBase64(dataURI.replace('data:audio/wav;base64,', '')); |
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} |
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} |
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rochars /
wavefile
