1f701bd265
This patch adds basic functionality for translating speech to text, using the Google speech API, from audio received over a websocket after a successful negotiation with Asterisk using the Asterisk External Application Protocol.
103 lines
2.2 KiB
JavaScript
103 lines
2.2 KiB
JavaScript
/*
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* Copyright 2022 Sangoma Technologies Corporation
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* Kevin Harwell <kharwell@sangoma.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const utils = require("./utils");
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/**
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* Supported codecs
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*/
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const supported = [
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{
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"name": "ulaw",
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"sampleRate": 8000,
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"attributes" : [],
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},
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{
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"name": "slin16",
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"sampleRate": 16000,
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"attributes" : [],
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},
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{
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"name": "opus",
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"sampleRate": 48000,
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"attributes" : [],
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},
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];
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/**
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* Checks if given codecs match.
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*
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* @param {Object} obj1 - A codec object
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* @param {Object} obj2 - A codec object
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* @return {boolean} true if codecs match otherwise false.
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*/
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function equal(obj1, obj2) {
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return obj1.name === obj2.name;
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}
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/**
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* Converts codecs to a comma separated string of codec names.
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*
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* @param {Object|Object[]} objs - Codecs to convert
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* @return {string} A comma separated string of codec names.
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*/
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function toString(objs) {
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if (!Array.isArray(objs)) {
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objs = [objs];
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}
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return objs.map(o => o.name).join(", ");
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}
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/** @class Codecs. */
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class Codecs {
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/**
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* Creates an instance of Codecs.
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*
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* @param {Object} options - Codec options
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*/
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constructor(options) {
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this.codecs = options.codecs ?
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utils.intersect(supported, options.codecs, equal) : supported;
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this.selected = this.codecs[0]; // Default to first in list
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}
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/**
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* Selects the first matching codec between supported and given codecs
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*
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* @param {Object|Object[]} codecs - Codecs to intersect with supported
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* @return The first selected codec
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*/
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first(codecs) {
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try {
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let res = utils.first(this.codecs, codecs, equal);
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if (res) {
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return res;
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}
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} catch (e) {
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}
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throw new Error("Codec " + toString(codecs) + " not supported");
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}
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};
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module.exports = {
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Codecs,
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}
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