Precise streaming over sockets example

LICENSE

Copyright 2018 Matthew Scholefield

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

precise_client.py

#!/usr/bin/env python3

import pyaudio
import socket

ADDRESS = ('localhost', 10000)
CHUNK_SIZE = 2048

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(ADDRESS)

audio = pyaudio.PyAudio()
stream = audio.open(
    format=pyaudio.paInt16, channels=1,
    rate=16000, input=True, frames_per_buffer=CHUNK_SIZE
)

try:
    while True:
        sock.sendall(stream.read(CHUNK_SIZE))
finally:
    stream.stop_stream()
    stream.close()
    audio.terminate()
    sock.close()

precise_server.py

#!/usr/bin/env python3

import socket
from threading import Thread

from precise.network_runner import Listener
from precise_runner import PreciseRunner, ReadWriteStream, PreciseEngine
from precise_runner.runner import ListenerEngine

ADDRESS = ('localhost', 10000)
MODEL_NAME = 'my-model.pb.or.net'
CHUNK_SIZE = 2048

stream = ReadWriteStream()
runner = PreciseRunner(
    PreciseEngine('.venv/bin/precise-engine', MODEL_NAME),
    stream=stream, on_activation=lambda: print('Activated!')
)
runner.start()


class PreciseConnection:
    """Represents a socket connection routed to a precise process"""

    def __init__(self, connection, address):
        self.address = address
        self.connection = connection  # type: socket.socket
        self.stream = ReadWriteStream()
        self.runner = PreciseRunner(
            ListenerEngine(Listener(MODEL_NAME, CHUNK_SIZE), CHUNK_SIZE),
            1, stream=self.stream, on_activation=self.on_activation,
            on_prediction=self.on_prediction
        )
        self.runner.start()

    def on_activation(self):
        print(' --- ACTIVATION from:', self.address, '--- ')

    def on_prediction(self, conf):
        print('!' if conf > 0.5 else '.', end='', flush=True)

    def update(self):
        """Return whether connection still alive"""
        data = self.connection.recv(CHUNK_SIZE)
        self.stream.write(data)
        return bool(data)

    def close(self):
        print('Closing connection from', self.address)
        self.runner.stop()
        self.connection.close()


class ConnectionManager:
    def __init__(self):
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.bind(ADDRESS)
        self.sock.listen(1)

        self.connections = []

    def wait_for_connection(self):
        print('Waiting for a connection...')
        connection, client_address = self.sock.accept()

        print('New connection:', client_address)
        self.connections.append(PreciseConnection(connection, client_address))

        Thread(target=self.wait_for_connection, daemon=True).start()

    def update(self):
        for i, conn in enumerate(list(self.connections)):
            if not conn.update():
                conn.close()
                del self.connections[i]

    def close(self):
        for i in self.connections:
            i.close()


def main():
    manager = ConnectionManager()
    manager.wait_for_connection()

    try:
        while True:
            manager.update()
    finally:
        manager.close()


if __name__ == '__main__':
    main()

requirements.txt

mycroft-precise
precise-runner
pyaudio