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streaming.py
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streaming.py
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#!/usr/bin/env python3
"""Interface to easily enable the creation of a streaming mjpg server"""
import io
import logging
import socketserver
from http import server
from threading import Condition
from picamera2 import Picamera2
from picamera2.encoders import MJPEGEncoder
from picamera2.outputs import FileOutput
PAGE = """\
<html>
<head>
<title>Streaming</title>
</head>
<body>
<h1>TinyCam Streaming</h1>
<img src="stream.mjpg" width="640" height="480" />
</body>
</html>
"""
# TODO finish refactor streaming classes here
class StreamingOutput(io.BufferedIOBase):
"""Simple class to create streaming output"""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.frame = None
self.condition = Condition()
def write(self, buf):
with self.condition:
self.frame = buf
self.condition.notify_all()
class StreamingHandler(server.BaseHTTPRequestHandler):
"""Simple class to handle http requests"""
def do_GET(self): # pylint: disable=invalid-name
"""Handle GET requests"""
if self.path == '/':
self.send_response(301)
self.send_header('Location', '/index.html')
self.end_headers()
elif self.path == '/index.html':
content = PAGE.encode('utf-8')
self.send_response(200)
self.send_header('Content-Type', 'text/html')
self.send_header('Content-Length', len(content))
self.end_headers()
self.wfile.write(content)
elif self.path == '/stream.mjpg':
self.send_response(200)
self.send_header('Age', 0)
self.send_header('Cache-Control', 'no-cache, private')
self.send_header('Pragma', 'no-cache')
self.send_header('Content-Type', 'multipart/x-mixed-replace; boundary=FRAME')
self.end_headers()
try:
while True:
with output.condition:
output.condition.wait()
frame = output.frame
self.wfile.write(b'--FRAME\r\n')
self.send_header('Content-Type', 'image/jpeg')
self.send_header('Content-Length', len(frame))
self.end_headers()
self.wfile.write(frame)
self.wfile.write(b'\r\n')
except BrokenPipeError as exception:
logging.warning(
'Removed streaming client %s: %s',
self.client_address, str(exception))
else:
self.send_error(404)
self.end_headers()
class StreamingServer(socketserver.ThreadingMixIn, server.HTTPServer):
"""Configuration for the http server"""
allow_reuse_address = True
daemon_threads = True
def serve(port: int = 3001):
"""Start streaming"""
picam2 = Picamera2() # pylint: disable=not-callable
picam2.configure(picam2.create_video_configuration(main={"size": (640, 480)}))
picam2.start_recording(MJPEGEncoder(), FileOutput(output))
try:
address = ('', port)
streaming_server = StreamingServer(address, StreamingHandler)
streaming_server.serve_forever()
finally:
picam2.stop_recording()
output = StreamingOutput()
if __name__ == "__main__":
serve()