The code imports necessary modules, sets the HOMEPATH variable, configures a TTS model, and defines a generateSpeech function to synthesize speech from a prompt and save it to a file. The generateSpeech function is then exported as the default export of the module.

Cell 4

import path from 'path'
import process from 'process'
import { HFModelConfig_v1, InterfaceHF } from "outetts";

const HOMEPATH = process.env.HOME || process.env.HOMEPATH || process.env.USERPROFILE

// Configure the model
const model_config = new HFModelConfig_v1({
    model_path: 'OuteAI/OuteTTS-0.3-1B',
    language: "en", // Supported languages in v0.2: en, zh, ja, ko
    dtype: 'fp32', // Supported dtypes: fp32, q8, q4
})

let tts_interface
let speaker
async function generateSpeech(prompt) {
    // Initialize the interface
    if(!tts_interface) {
        tts_interface = await InterfaceHF({ model_version: "0.2", cfg: model_config })

        // Print available default speakers
        tts_interface.print_default_speakers()

        // Load a default speaker
        speaker = tts_interface.load_default_speaker("male_1")
    }

    // Generate speech
    const output = await tts_interface.generate({
        text: prompt,
        temperature: 0.1, // Lower temperature values may result in a more stable tone
        repetition_penalty: 1.1,
        //max_length: 4096,

        // Optional: Use a speaker profile for consistent voice characteristics
        // Without a speaker profile, the model will generate a voice with random characteristics
        speaker,
    })

    // Save the synthesized speech to a file
    output.save("output.wav")
}

export default generateSpeech

// Import required modules
import { createInterface, createSpeaker } from './interface.js';
import { HFModelConfig_v1, InterfaceHF } from './outetts.js';

// Define constants
const HOMEPATH = process.env.HOME || process.env.HOMEPATH || process.env.USERPROFILE;
const DEFAULT_MODEL_PATH = 'OuteAI/OuteTTS-0.3-1B';
const DEFAULT_LANGUAGE = 'en';
const DEFAULT_DTYPE = 'fp32';

// Create a configuration class for the model
class ModelConfig {
  constructor({
    modelPath = DEFAULT_MODEL_PATH,
    language = DEFAULT_LANGUAGE,
    dtype = DEFAULT_DTYPE,
  }) {
    this.modelPath = modelPath;
    this.language = language;
    this.dtype = dtype;
  }
}

// Create an interface to the model
class TTSInterface {
  constructor({ modelVersion = '0.2', cfg, modelPath = DEFAULT_MODEL_PATH }) {
    this.modelVersion = modelVersion;
    this.cfg = cfg;
    this.modelPath = modelPath;
    this.speaker = null;
  }

  async generate(options) {
    if (!this.speaker) {
      await this.loadDefaultSpeaker('male_1');
    }

    const { text, temperature = 0.1, repetitionPenalty = 1.1 } = options;
    const output = await this.interface.generate({
      text,
      temperature,
      repetitionPenalty,
      speaker: this.speaker,
    });

    return output;
  }

  async loadDefaultSpeaker(speakerName) {
    const speaker = await this.interface.loadDefaultSpeaker(speakerName);
    this.speaker = speaker;
  }

  async printDefaultSpeakers() {
    await this.interface.printDefaultSpeakers();
  }
}

// Refactor the generateSpeech function
async function generateSpeech(prompt, {
  modelVersion = '0.2',
  modelPath = DEFAULT_MODEL_PATH,
  language = DEFAULT_LANGUAGE,
  dtype = DEFAULT_DTYPE,
} = {}) {
  // Create a model configuration
  const modelConfig = new ModelConfig({ modelPath, language, dtype });

  // Create an interface to the model
  let interface;
  if (!interface) {
    interface = new TTSInterface({ modelVersion, cfg: modelConfig });
    await interface.printDefaultSpeakers();
    await interface.loadDefaultSpeaker('male_1');
  }

  // Generate speech
  const output = await interface.generate({ text: prompt });

  // Save the synthesized speech to a file
  output.save('output.wav');
}

// Export the generateSpeech function
export default generateSpeech;

// TODO: Refactor the interface.js file to use ES6 classes
// TODO: Add error handling for the outetts module

Code Breakdown

Import Statements

The code imports the following modules:

• path from the path module, which provides utilities for working with file paths.
• process from the process module, which provides information about the current Node.js process.
• HFModelConfig_v1 and InterfaceHF from the outetts module, which are used to configure and interact with a TTS (Text-to-Speech) model.

Environment Variable

The code sets the HOMEPATH variable to the value of the following environment variables in order:

1. HOME
2. HOMEPATH
3. USERPROFILE

This is used to determine the home directory on the user's system.

Model Configuration

The code creates a new instance of HFModelConfig_v1 with the following settings:

• model_path: The path to the TTS model, set to 'OuteAI/OuteTTS-0.3-1B'.
• language: The language of the model, set to "en" (English).
• dtype: The data type of the model, set to "fp32" (Float 32).

Function generateSpeech

This is the main function that generates speech from a given prompt. It:

• Initializes the TTS interface if it hasn't been initialized before.
• Prints the available default speakers.
• Loads a default speaker named "male_1".
• Generates speech using the generate method of the TTS interface, passing in the prompt and other settings.
• Saves the synthesized speech to a file named "output.wav".

Export

The generateSpeech function is exported as the default export of the module.