@micdrop/gladia
Version:
Gladia implementation for @micdrop/server
225 lines (223 loc) • 8.21 kB
JavaScript
"use strict";
var __create = Object.create;
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __getProtoOf = Object.getPrototypeOf;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
for (var name in all)
__defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
if (from && typeof from === "object" || typeof from === "function") {
for (let key of __getOwnPropNames(from))
if (!__hasOwnProp.call(to, key) && key !== except)
__defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
}
return to;
};
var __toESM = (mod, isNodeMode, target) => (target = mod != null ? __create(__getProtoOf(mod)) : {}, __copyProps(
// If the importer is in node compatibility mode or this is not an ESM
// file that has been converted to a CommonJS file using a Babel-
// compatible transform (i.e. "__esModule" has not been set), then set
// "default" to the CommonJS "module.exports" for node compatibility.
isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target,
mod
));
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
// src/index.ts
var index_exports = {};
__export(index_exports, {
GladiaSTT: () => GladiaSTT
});
module.exports = __toCommonJS(index_exports);
// src/GladiaSTT.ts
var import_server = require("@micdrop/server");
var import_ws = __toESM(require("ws"));
var SAMPLE_RATE = 16e3;
var BIT_DEPTH = 16;
var DEFAULT_CONNECTION_TIMEOUT = 5e3;
var DEFAULT_TRANSCRIPTION_TIMEOUT = 4e3;
var DEFAULT_RETRY_DELAY = 1e3;
var DEFAULT_MAX_RETRY = 3;
var GladiaSTT = class extends import_server.STT {
constructor(options) {
super();
this.options = options;
this.audioChunksPending = [];
// Store audio chunks to send them again if reconnecting
this.retryCount = 0;
// Register real-time transcription to get a WebSocket URL
this.getURL = async () => {
const response = await fetch("https://api.gladia.io/v2/live", {
method: "POST",
headers: {
"Content-Type": "application/json",
"X-Gladia-Key": this.options.apiKey
},
body: JSON.stringify({
encoding: "wav/pcm",
sample_rate: SAMPLE_RATE,
bit_depth: BIT_DEPTH,
channels: 1,
messages_config: {
receive_final_transcripts: true,
receive_speech_events: false,
receive_pre_processing_events: false,
receive_realtime_processing_events: false,
receive_post_processing_events: false,
receive_acknowledgments: false,
receive_errors: true,
receive_lifecycle_events: false
},
...this.options.settings
})
});
if (!response.ok) {
const status = response.status;
if (status >= 400 && status < 500) {
throw new Error(`${status}: ${response.statusText}`);
}
this.log("Error getting URL, retrying...", {
status,
text: response.statusText
});
await new Promise(
(resolve) => setTimeout(resolve, this.options.retryDelay ?? DEFAULT_RETRY_DELAY)
);
return this.getURL();
}
const { url } = await response.json();
return url;
};
// Connect to Gladia
this.initWS = async (url) => {
return new Promise((resolve, reject) => {
const socket = new import_ws.default(url);
this.socket = socket;
const timeout = setTimeout(() => {
this.log("Connection timeout");
socket.removeAllListeners();
socket.close();
this.socket = void 0;
reject(new Error("WebSocket connection timeout"));
}, this.options.connectionTimeout ?? DEFAULT_CONNECTION_TIMEOUT);
socket.addEventListener("open", () => {
clearTimeout(timeout);
this.log("Connection opened");
resolve();
});
socket.addEventListener("error", (error) => {
clearTimeout(timeout);
this.log("WebSocket error:", error);
reject(new Error("WebSocket connection error"));
});
socket.addEventListener("close", ({ code, reason }) => {
clearTimeout(timeout);
this.socket?.removeAllListeners();
this.socket = void 0;
if (code !== 1e3) {
this.reconnect();
} else {
this.log("Connection closed", { code, reason });
}
});
socket.addEventListener("message", (event) => {
const message = JSON.parse(event.data.toString());
if (message.type === "transcript" && message.data.is_final) {
const transcript = message.data.utterance.text;
this.log(`Received transcript: "${transcript}"`);
this.emit("Transcript", transcript);
this.audioChunksPending.length = 0;
if (this.transcriptionTimeout) {
clearTimeout(this.transcriptionTimeout);
this.transcriptionTimeout = void 0;
}
}
});
});
};
this.initPromise = this.getURL().then(this.initWS).catch((error) => {
console.error("[GladiaSTT] Connection error:", error);
this.reconnect();
});
}
transcribe(audioStream) {
audioStream.on("data", async (chunk) => {
this.audioChunksPending.push(chunk);
await this.initPromise;
this.socket?.send(chunk);
this.log(`Sent audio chunk (${chunk.byteLength} bytes)`);
});
audioStream.on("end", async () => {
await this.initPromise;
if (this.audioChunksPending.length === 0) return;
this.sendSilence(2);
this.transcriptionTimeout = setTimeout(() => {
this.transcriptionTimeout = void 0;
this.log(`Transcription timeout`);
this.emit("Transcript", "");
this.audioChunksPending.length = 0;
}, this.options.transcriptionTimeout || DEFAULT_TRANSCRIPTION_TIMEOUT);
});
}
destroy() {
super.destroy();
if (this.reconnectTimeout) {
clearTimeout(this.reconnectTimeout);
this.reconnectTimeout = void 0;
}
if (this.transcriptionTimeout) {
clearTimeout(this.transcriptionTimeout);
this.transcriptionTimeout = void 0;
}
this.socket?.removeAllListeners();
if (this.socket?.readyState === import_ws.default.OPEN) {
this.socket?.close(1e3);
}
this.socket = void 0;
}
reconnect() {
this.retryCount++;
if (this.retryCount > (this.options.maxRetry ?? DEFAULT_MAX_RETRY)) {
this.log("Max retries reached, giving up");
this.emit("Failed", this.audioChunksPending);
return;
}
this.initPromise = new Promise((resolve) => {
this.log("Reconnecting...");
this.reconnectTimeout = setTimeout(() => {
this.reconnectTimeout = void 0;
this.getURL().then(this.initWS).then(() => {
this.retryCount = 0;
if (this.audioChunksPending.length > 0) {
this.log("Sending audio chunks again");
this.audioChunksPending.forEach(
(chunk) => this.socket?.send(chunk)
);
}
}).then(resolve).catch((error) => {
this.log("Reconnection error:", error);
this.reconnect();
});
}, this.options.retryDelay ?? DEFAULT_RETRY_DELAY);
});
}
sendSilence(durationSeconds) {
if (!this.socket) return;
const numSamples = Math.round(SAMPLE_RATE * durationSeconds);
const bytesPerSample = BIT_DEPTH / 8;
const silenceBuffer = Buffer.alloc(numSamples * bytesPerSample);
this.socket.send(silenceBuffer);
this.audioChunksPending.push(silenceBuffer);
this.log(
`Sent ${durationSeconds * 1e3}ms of silence (${silenceBuffer.byteLength} bytes) after stream end`
);
}
};
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
GladiaSTT
});
//# sourceMappingURL=index.js.map