ivr-tester-transcriber-google-speech-to-text/dist/GoogleSpeechToText.js

Google Speech-to-Text integration for IVR Tester

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.GoogleSpeechToText = void 0;
const speech_1 = require("@google-cloud/speech");
const ivr_tester_1 = require("ivr-tester");
const Debugger_1 = require("./Debugger");
class GoogleSpeechToText extends ivr_tester_1.TypedEmitter {
    constructor(languageCode, speechPhrases = [], useEnhanced = false, speechClient = new speech_1.SpeechClient()) {
        super();
        this.speechClient = speechClient;
        this.config = GoogleSpeechToText.createConfig(languageCode, speechPhrases, useEnhanced);
        GoogleSpeechToText.debug("Configuration: %O", this.config);
    }
    static createConfig(languageCode, speechPhrases, useEnhanced) {
        return {
            config: {
                encoding: speech_1.protos.google.cloud.speech.v1.RecognitionConfig.AudioEncoding.MULAW,
                sampleRateHertz: 8000,
                languageCode,
                model: "phone_call",
                speechContexts: [{ phrases: speechPhrases }],
                useEnhanced,
            },
            interimResults: true,
            singleUtterance: false,
        };
    }
    transcribe(payload) {
        this.getStream().write(payload.toString("base64"));
    }
    close() {
        if (this.stream) {
            this.stream.removeAllListeners();
            this.stream.write(Buffer.from([]));
            this.stream.destroy();
            this.stream = null;
            GoogleSpeechToText.debug("Stream destroyed");
        }
    }
    createStream() {
        return (this.stream = this.speechClient
            .streamingRecognize(this.config)
            .on("error", (error) => {
            GoogleSpeechToText.debug(error);
            this.stream.removeAllListeners();
            this.stream.destroy();
            this.stream = null;
        })
            .on("data", (data) => {
            GoogleSpeechToText.debug("Data: %O", data);
            const result = data.results[0];
            if ((result === null || result === void 0 ? void 0 : result.alternatives[0]) !== undefined) {
                const event = {
                    transcription: result.alternatives[0].transcript.trim(),
                    isFinal: result.isFinal,
                };
                GoogleSpeechToText.debug("Emitted: %O", event);
                this.emit("transcription", event);
            }
        }));
    }
    getStream() {
        if (!this.stream) {
            this.stream = this.createStream();
        }
        return this.stream;
    }
    transcriptionComplete() {
        this.close();
    }
}
exports.GoogleSpeechToText = GoogleSpeechToText;
GoogleSpeechToText.debug = Debugger_1.Debugger.getPackageDebugger();