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# Gladia

Gladia provides speech-to-text (STT) only. The Mastra integration uploads prerecorded audio, waits for Gladia to finish transcribing it, and returns the combined transcript as a string.

## Installation

**npm**:

```bash
npm install @mastra/voice-gladia@latest
```

**pnpm**:

```bash
pnpm add @mastra/voice-gladia@latest
```

**Yarn**:

```bash
yarn add @mastra/voice-gladia@latest
```

**Bun**:

```bash
bun add @mastra/voice-gladia@latest
```

## API key

Set `GLADIA_API_KEY` or pass the key through `listeningModel.apiKey`. The constructor throws `GLADIA_API_KEY is not set.` when neither value is available.

## Usage example

Set `GLADIA_API_KEY` to use the default configuration:

```typescript
import { createReadStream } from 'node:fs'
import { GladiaVoice } from '@mastra/voice-gladia'

const voice = new GladiaVoice()
const audio = createReadStream('./audio.m4a')

const transcript = await voice.listen(audio, {
  fileName: 'audio.m4a',
  mimeType: 'audio/mp4',
  options: {
    diarization: true,
    detect_language: true,
  },
})
```

You can also pass the API key directly:

```typescript
import { GladiaVoice } from '@mastra/voice-gladia'

const voice = new GladiaVoice({
  listeningModel: {
    apiKey: process.env.GLADIA_API_KEY,
  },
})
```

## Constructor parameters

**listeningModel** (`GladiaConfig`): Configuration for speech-to-text.

**listeningModel.apiKey** (`string`): Gladia API key. Falls back to the GLADIA\_API\_KEY environment variable.

## Methods

### `listen()`

Uploads prerecorded audio and returns the full transcript.

**audioStream** (`NodeJS.ReadableStream`): Audio stream to transcribe. The stream is buffered before it is uploaded.

**mimeType** (`string`): MIME type of the audio file. The method throws an error if this value is missing.

**fileName** (`string`): Name of the uploaded audio file. The method throws an error if this value is missing.

**options** (`GladiaListenOptions`): Options for the prerecorded transcription job.

**options.diarization** (`boolean`): Whether to identify different speakers in the recording.

**options.diarization\_config** (`object`): Speaker-count settings for diarization.

**options.diarization\_config.number\_of\_speakers** (`number`): Exact number of speakers in the recording.

**options.diarization\_config.min\_speakers** (`number`): Minimum number of speakers to detect.

**options.diarization\_config.max\_speakers** (`number`): Maximum number of speakers to detect.

**options.translation** (`boolean`): Whether to translate the transcript.

**options.translation\_config** (`object`): Translation model and target languages.

**options.translation\_config.model** (`'base' | 'enhanced'`): Translation model to use.

**options.translation\_config.target\_languages** (`string[]`): Languages to translate the transcript into.

**options.detect\_language** (`boolean`): Whether to detect the spoken language automatically.

**options.enable\_code\_switching** (`boolean`): Whether to detect multiple languages within the recording.

Returns: `Promise<string>` containing the full transcript.

### `speak()`

Gladia doesn't support text-to-speech. Calling this method throws `Gladia does not support text-to-speech.`

## Important notes

- Gladia processes prerecorded audio through an upload and transcription job. It doesn't provide streaming transcription through this package.
- The input stream is fully buffered before upload.
- `listen()` returns only `full_transcript`. It doesn't return per-speaker segments or other response metadata.
- The integration polls once per second until the job finishes or fails. It doesn't set a polling timeout.
- A Gladia API key is required.