text to speech api mp3 wav streaming

If you want a Text-to-Speech API that can return MP3/WAV and support streaming, here are the main options and how to think about them:

Common TTS APIs

• OpenAI TTS
• Google Cloud Text-to-Speech
• Amazon Polly
• Microsoft Azure Speech
• ElevenLabs

Typical audio formats

Most TTS APIs support some combination of:

• MP3 — smaller, good for web/mobile
• WAV — larger, uncompressed, good for editing/processing
• OGG/Opus — efficient streaming-friendly format
• Sometimes PCM for raw audio streams

Streaming support

“Streaming” usually means the API sends audio chunks as it is generated, instead of waiting for the whole file.

Good for streaming

• OpenAI TTS / Realtime-related audio APIs
• ElevenLabs
• Azure Speech SDK
• Amazon Polly can be streamed through SDKs
• Google TTS is often more file-oriented, but can be used efficiently with async handling

Example usage patterns

1) Standard file response

Request TTS, save response as:

• mp3 for playback
• wav for processing

2) Streaming response

Server sends audio as a byte stream:

• browser/client starts playback before full synthesis is complete
• useful for voice assistants and live narration

If you want a quick recommendation

• Need easiest MP3/WAV download: OpenAI, Google, Azure, Polly
• Need best streaming UX: ElevenLabs or Azure Speech SDK
• Need enterprise/cloud integration: Azure / Google / AWS

Example API design

If you’re building your own endpoint, a common pattern is:

POST /tts
Content-Type: application/json

{
  "text": "Hello world",
  "format": "mp3",
  "stream": true
}

Response:

• Content-Type: audio/mpeg for MP3
• Content-Type: audio/wav for WAV

If streaming:

• Transfer-Encoding: chunked
• or a server-sent/streamed audio response

Simple Node.js streaming idea

app.post('/tts', async (req, res) => {
  const { text } = req.body;

  res.setHeader('Content-Type', 'audio/mpeg');

  const audioStream = await ttsService.stream(text);
  audioStream.pipe(res);
});

If you want, I can give you:

1. a working example using OpenAI,
2. an Express/Node streaming endpoint, or
3. a browser client that plays MP3/WAV as it streams.