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