OpenedAI Speech

An OpenAI API compatible text to speech server.

• Compatible with the OpenAI audio/speech API
• Serves the /v1/audio/speech endpoint
• Not affiliated with OpenAI in any way, does not require an OpenAI API Key
• A free, private, text-to-speech server with custom voice cloning

Full Compatibility:

• tts-1: alloy, echo, fable, onyx, nova, and shimmer (configurable)
• tts-1-hd: alloy, echo, fable, onyx, nova, and shimmer (configurable, uses OpenAI samples by default)
• response_format: mp3, opus, aac, or flac
• speed 0.25-4.0 (and more)

Details:

• Model tts-1 via piper tts (very fast, runs on cpu)
  • You can map your own piper voices via the voice_to_speaker.yaml configuration file
• Model tts-1-hd via coqui-ai/TTS xtts_v2 voice cloning (fast, but requires around 4GB GPU VRAM)
  • Custom cloned voices can be used for tts-1-hd, See: Custom Voices Howto
  • 🌐 Multilingual support with XTTS voices
• Occasionally, certain words or symbols may sound incorrect, you can fix them with regex via pre_process_map.yaml

If you find a better voice match for tts-1 or tts-1-hd, please let me know so I can update the defaults.

Recent Changes

Version 0.11.0, 2024-05-29

• 🌐 Multilingual support (16 languages) with XTTS
• Remove high Unicode filtering from the default config/pre_process_map.yaml
• Update Docker build & app startup. thanks @justinh-rahb
• Fix: "Plan failed with a cudnnException"
• Remove piper cuda support

Version: 0.10.1, 2024-05-05

• Remove runtime: nvidia from docker-compose.yml, this assumes nvidia/cuda compatible runtime is available by default. thanks @jmtatsch

Version: 0.10.0, 2024-04-27

• Pre-built & tested docker images, smaller docker images (8GB or 860MB)
• Better upgrades: reorganize config files under config/, voice models under voices/
• Compatibility! If you customized your voice_to_speaker.yaml or pre_process_map.yaml you need to move them to the config/ folder.
• default listen host to 0.0.0.0

Version: 0.9.0, 2024-04-23

• Fix bug with yaml and loading UTF-8
• New sample text-to-speech application say.py
• Smaller docker base image
• Add beta parler-tts support (you can describe very basic features of the speaker voice), See: (https://www.text-description-to-speech.com/) for some examples of how to describe voices. Voices can be defined in the voice_to_speaker.default.yaml. Two example parler-tts voices are included in the voice_to_speaker.default.yaml file. parler-tts is experimental software and is kind of slow. The exact voice will be slightly different each generation but should be similar to the basic description.

...

Version: 0.7.3, 2024-03-20

• Allow different xtts versions per voice in voice_to_speaker.yaml, ex. xtts_v2.0.2
• Quality: Fix xtts sample rate (24000 vs. 22050 for piper) and pops

Installation instructions

1. Copy the sample.env to speech.env (customize if needed)

cp sample.env speech.env

2. Option: Docker (recommended) (prebuilt images are available)

Run the server:

docker compose up

For a minimal docker image with only piper support (<1GB vs. 8GB), use docker compose -f docker-compose.min.yml up

To install the docker image as a service, edit the docker-compose.yml and uncomment restart: unless-stopped, then start the service with: docker compose up -d

2. Option: Manual installation:

# install curl and ffmpeg
sudo apt install curl ffmpeg
# Create & activate a new virtual environment (optional but recommended)
python -m venv .venv
source .venv/bin/activate
# Install the Python requirements
pip install -r requirements.txt
# run the server
bash startup.sh

Usage

usage: speech.py [-h] [--xtts_device XTTS_DEVICE] [--preload PRELOAD] [-P PORT] [-H HOST]

OpenedAI Speech API Server

options:
  -h, --help            show this help message and exit
  --xtts_device XTTS_DEVICE
                        Set the device for the xtts model. The special value of 'none' will use piper for all models. (default: cuda)
  --preload PRELOAD     Preload a model (Ex. 'xtts' or 'xtts_v2.0.2'). By default it's loaded on first use. (default: None)
  -P PORT, --port PORT  Server tcp port (default: 8000)
  -H HOST, --host HOST  Host to listen on, Ex. 0.0.0.0 (default: 0.0.0.0)

API Documentation

• OpenAI Text to speech guide
• OpenAI API Reference

Sample API Usage

You can use it like this:

curl http://localhost:8000/v1/audio/speech -H "Content-Type: application/json" -d '{
    "model": "tts-1",
    "input": "The quick brown fox jumped over the lazy dog.",
    "voice": "alloy",
    "response_format": "mp3",
    "speed": 1.0
  }' > speech.mp3

Or just like this:

curl http://localhost:8000/v1/audio/speech -H "Content-Type: application/json" -d '{
    "input": "The quick brown fox jumped over the lazy dog."}' > speech.mp3

Or like this example from the OpenAI Text to speech guide:

import openai

client = openai.OpenAI(
  # This part is not needed if you set these environment variables before import openai
  # export OPENAI_API_KEY=sk-11111111111
  # export OPENAI_BASE_URL=http://localhost:8000/v1
  api_key = "sk-111111111",
  base_url = "http://localhost:8000/v1",
)

with client.audio.speech.with_streaming_response.create(
  model="tts-1",
  voice="alloy",
  input="Today is a wonderful day to build something people love!"
) as response:
  response.stream_to_file("speech.mp3")

Also see the say.py sample application for an example of how to use the openai-python API.

python say.py -t "The quick brown fox jumped over the lazy dog." -p # play the audio, requires 'pip install playsound'
python say.py -t "The quick brown fox jumped over the lazy dog." -m tts-1-hd -v onyx -f flac -o fox.flac # save to a file.

usage: say.py [-h] [-m MODEL] [-v VOICE] [-f {mp3,aac,opus,flac}] [-s SPEED] [-t TEXT] [-i INPUT] [-o OUTPUT] [-p]

Text to speech using the OpenAI API

options:
  -h, --help            show this help message and exit
  -m MODEL, --model MODEL
                        The model to use (default: tts-1)
  -v VOICE, --voice VOICE
                        The voice of the speaker (default: alloy)
  -f {mp3,aac,opus,flac}, --format {mp3,aac,opus,flac}
                        The output audio format (default: mp3)
  -s SPEED, --speed SPEED
                        playback speed, 0.25-4.0 (default: 1.0)
  -t TEXT, --text TEXT  Provide text to read on the command line (default: None)
  -i INPUT, --input INPUT
                        Read text from a file (default is to read from stdin) (default: None)
  -o OUTPUT, --output OUTPUT
                        The filename to save the output to (default: None)
  -p, --playsound       Play the audio (default: False)

Custom Voices Howto

Piper

1. Select the piper voice and model from the piper samples
2. Update the config/voice_to_speaker.yaml with a new section for the voice, for example:

...
tts-1:
  ryan:
    model: voices/en_US-ryan-high.onnx
    speaker: # default speaker

3. New models will be downloaded as needed, of you can download them in advance with download_voices_tts-1.sh. For example:

bash download_voices_tts-1.sh en_US-ryan-high

Coqui XTTS v2

Coqui XTTS v2 voice cloning can work with as little as 6 seconds of clear audio. To create a custom voice clone, you must prepare a WAV file sample of the voice.

Guidelines for preparing good sample files for Coqui XTTS v2

• Mono (single channel) 22050 Hz WAV file
• 6-30 seconds long - longer isn't always better (I've had some good results with as little as 4 seconds)
• low noise (no hiss or hum)
• No partial words, breathing, music or backgrounds sounds
• An even speaking pace with a variety of words is best, like in interviews or audiobooks.

You can use FFmpeg to prepare your audio files, here are some examples:

# convert a multi-channel audio file to mono, set sample rate to 22050 hz, trim to 6 seconds, and output as WAV file.
ffmpeg -i input.mp3 -ac 1 -ar 22050 -t 6 -y me.wav
# use a simple noise filter to clean up audio, and select a start time start for sampling.
ffmpeg -i input.wav -af "highpass=f=200, lowpass=f=3000" -ac 1 -ar 22050 -ss 00:13:26.2 -t 6 -y me.wav
# A more complex noise reduction setup, including volume adjustment
ffmpeg -i input.mkv -af "highpass=f=200, lowpass=f=3000, volume=5, afftdn=nf=25" -ac 1 -ar 22050 -ss 00:13:26.2 -t 6 -y me.wav

Once your WAV file is prepared, save it in the /voices/ directory and update the config/voice_to_speaker.yaml file with the new file name.

For example:

...
tts-1-hd:
  me:
    model: xtts_v2.0.2 # you can specify different xtts versions
    speaker: voices/me.wav # this could be you

Multilingual

Multilingual support was added in version 0.11.0 and is available only with the XTTS v2 model.

Coqui XTTSv2 has support for 16 languages: English (en), Spanish (es), French (fr), German (de), Italian (it), Portuguese (pt), Polish (pl), Turkish (tr), Russian (ru), Dutch (nl), Czech (cs), Arabic (ar), Chinese (zh-cn), Japanese (ja), Hungarian (hu) and Korean (ko).

Unfortunately the OpenAI API does not support language, but you can create your own custom speaker voice and set the language for that.

1. Create the WAV file for your speaker, as in Custom Voices Howto
2. Add the voice to config/voice_to_speaker.yaml and include the correct Coqui language code for the speaker. For example:

  xunjiang:
    model: xtts
    speaker: voices/xunjiang.wav
    language: zh-cn

3. Don't remove high unicode characters in your config/pre_process_map.yaml! If you have these lines, you will need to remove them. For example:

Remove:

- - '[\U0001F600-\U0001F64F\U0001F300-\U0001F5FF\U0001F680-\U0001F6FF\U0001F700-\U0001F77F\U0001F780-\U0001F7FF\U0001F800-\U0001F8FF\U0001F900-\U0001F9FF\U0001FA00-\U0001FA6F\U0001FA70-\U0001FAFF\U00002702-\U000027B0\U000024C2-\U0001F251]+'
  - ''

These lines were added to the config/pre_process_map.yaml config file by default before version 0.11.0:

4. Your new multi-lingual speaker voice is ready to use!