Fonoster MCP Server

/** * Copyright (C) 2025 by Fonoster Inc (https://fonoster.com) * http://github.com/fonoster/fonoster * * This file is part of Fonoster * * Licensed under the MIT License (the "License"); * you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * https://opensource.org/licenses/MIT * * 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. */ import { Readable } from "stream"; import { getLogger } from "@fonoster/logger"; import { WaveFile } from "wavefile"; import { streamToBuffer } from "./streamToBuffer"; const logger = getLogger({ service: "apiserver", filePath: __filename }); /** * Converts a ulaw stream to PCM 16-bit at 8kHz * * @param readableStream - The input ulaw audio stream to convert * @returns A Promise that resolves to a Buffer containing PCM 16-bit audio data at 8kHz */ export async function convertUlawToPCM16( readableStream: Readable ): Promise<Buffer> { try { const inputBuffer = await streamToBuffer(readableStream); const wav = new WaveFile(); wav.fromScratch(1, 8000, "8m", inputBuffer); wav.fromMuLaw(); const waveBuffer = wav.toBuffer(); return Buffer.from( waveBuffer.buffer, waveBuffer.byteOffset + 44, waveBuffer.byteLength - 44 ); } catch (error) { logger.error(`error converting audio format: ${error.message}`, { stack: error.stack }); throw new Error(`Audio conversion failed: ${error.message}`); } }