tts_serve.py

from flask import Flask, request, Response
from shelljob import proc

app = Flask(__name__)

@app.route('/tts/<lang>.mp3')
def text_to_speech(lang):
    text = request.args.get('text')
    g = proc.Group()
    p  = g.run(['bash', '-c', 'espeak-ng -v mb-fr1 -q --pho "'+text+'" | mbrola -t 1.2 -f 1.0 /usr/share/mbrola/fr1/fr1 - -.au' + "|ffmpeg -i 'pipe:0' -vn -ar 16000 -ac 1 -b:a 48k -f mp3 'pipe:1'"])
    def read_process():
    	while g.is_pending():
    		lines = g.readlines()
    		for proc, line in lines:
    			yield line
    return Response(read_process(), mimetype='audio/mpeg')