This is a small server to deliver whisper speech to text.

Docker must be installed on the system to deploy the server to an image.

In order to test whisper locally on your system, you need to follow the steps on the Whisper Github Page:

• Install Python (at least version 3.7 or higher)

• Install ffmpeg, e.g.

sudo apt update && sudo apt install ffmpeg

• Install Whisper

pip install git+https://github.com/openai/whisper.git 

For the development of the server application, Python and pip are needed. The server is developed with flask. Dependencies can be installed using the requirements.txt file and pip:

pip install -r requirements.txt

See tutorials on developing a flask web server with python:

• https://flask.palletsprojects.com/en/2.2.x/tutorial/deploy/
• https://flask.palletsprojects.com/en/2.2.x/deploying/waitress/

Run the server locally either in development mode or in production (e.g. with waitress):

flask --app server run
waitress-serve --host 0.0.0.0 --port 5002 server:app

There is an experimental node server for which you need to install Node.js and the required dependencies:

npm install express --save
npm install body-parser --save
npm install multer --save

To start the server, use the common command:

npm start

Build and deploy the Python web server version with the provided Docker file using the following commands:

docker build . -t visualengineers/whisper-service
docker run --name=whisper-server -d -p=5002:80 --restart always visualengineers/whisper-service

Alternatively use:

docker compose up --build

Once you have the server running, either locally or as a Docker image, you need to provide POST requests to the route /whisper. Send a binary file as multipart parameter and form parameters to select the language model and language:

• uploaded_file: multipart, mimetype must be audio/mpeg or audio/wav or similar
• model: form parameter to specify the language model, can be {tiny.en,tiny,base.en,base,small.en,small,medium.en,medium,large} – first usage of a model will lead to long waiting times because they need to be downloaded first
• language: form parameter to specify the used language, can by anything from: {af,am,ar,as,az,ba,be,bg,bn,bo,br,bs,ca,cs,cy,da,de,el,en,es,et,eu,fa,fi,fo,fr,gl,gu,ha,haw,hi,hr,ht,hu,hy,id,is,it,iw,ja,jw,ka,kk,km,kn,ko,la,lb,ln,lo,lt,lv,mg,mi,mk,ml,mn,mr,ms,mt,my,ne,nl,nn,no,oc,pa,pl,ps,pt,ro,ru,sa,sd,si,sk,sl,sn,so,sq,sr,su,sv,sw,ta,te,tg,th,tk,tl,tr,tt,uk,ur,uz,vi,yi,yo,zh,Afrikaans,Albanian,Amharic,Arabic,Armenian,Assamese,Azerbaijani,Bashkir,Basque,Belarusian,Bengali,Bosnian,Breton,Bulgarian,Burmese,Castilian,Catalan,Chinese,Croatian,Czech,Danish,Dutch,English,Estonian,Faroese,Finnish,Flemish,French,Galician,Georgian,German,Greek,Gujarati,Haitian,Haitian Creole,Hausa,Hawaiian,Hebrew,Hindi,Hungarian,Icelandic,Indonesian,Italian,Japanese,Javanese,Kannada,Kazakh,Khmer,Korean,Lao,Latin,Latvian,Letzeburgesch,Lingala,Lithuanian,Luxembourgish,Macedonian,Malagasy,Malay,Malayalam,Maltese,Maori,Marathi,Moldavian,Moldovan,Mongolian,Myanmar,Nepali,Norwegian,Nynorsk,Occitan,Panjabi,Pashto,Persian,Polish,Portuguese,Punjabi,Pushto,Romanian,Russian,Sanskrit,Serbian,Shona,Sindhi,Sinhala,Sinhalese,Slovak,Slovenian,Somali,Spanish,Sundanese,Swahili,Swedish,Tagalog,Tajik,Tamil,Tatar,Telugu,Thai,Tibetan,Turkish,Turkmen,Ukrainian,Urdu,Uzbek,Valencian,Vietnamese,Welsh,Yiddish,Yoruba}

Using the MultipartUtility, here is Java code to POST audio data to the service:

String url = "https://127.0.0.1:5002/whisper";
File binaryFile = new File("audio.mp3");
String result = "";

try {
    // See the MultipartUtility class in a seperate file for information
    MultipartUtility utility = new MultipartUtility(url, "UTF-8");
    utility.addHeaderField("Content-Type", "audio/mpeg");
    utility.addFilePart("uploaded_file", binaryFile);
    // We can choose different recognition  models: tiny, base, small, medium, large 
    utility.addFormField("model", "base");
    // We can recognize different languages, English (en) performs best, German (de) worse
    utility.addFormField("language", "de");
    List<String> response = utility.finish();
    for (String s : response)
        result += s;
} catch (IOException e) {
    e.printStackTrace();
}