-
Notifications
You must be signed in to change notification settings - Fork 0
/
camera.py
162 lines (138 loc) · 5.1 KB
/
camera.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
# Web streaming example
# Source code from the official PiCamera package
# http://picamera.readthedocs.io/en/latest/recipes2.html#web-streaming
import io
import logging
import socketserver
import threading
from threading import Condition
from http import server
import json
import cgi
import time
from interface import ServerInterface
from picamera import PiCamera
from config import ProjectConfig
from queue import Queue
PAGE = """\
<html>
<head>
<title>Raspberry Pi - Camera</title>
</head>
<body>
<center><h1>Raspberry Pi - Camera</h1></center>
<center><img src="stream.mjpg" width="640" height="480"></center>
</body>
</html>
"""
class StreamingOutput(object):
def __init__(self):
self.frame = None
self.buffer = io.BytesIO()
self.condition = Condition()
def write(self, buf):
if buf.startswith(b'\xff\xd8'):
# New frame, copy the existing buffer's content and notify all
# clients it's available
self.buffer.truncate()
with self.condition:
self.frame = self.buffer.getvalue()
self.condition.notify_all()
self.buffer.seek(0)
return self.buffer.write(buf)
class StreamingHandler(server.BaseHTTPRequestHandler):
def do_POST(self):
if self.path == '/labels':
ctype, pdict = cgi.parse_header(self.headers.get('content-type'))
if ctype != 'application/json':
self.send_response(400)
self.end_headers()
return
length = int(self.headers["Content-Length"])
raw_message = self.rfile.read(length)
message = json.loads(raw_message)
queue.put(message['label'])
self.send_response(200)
self.send_header('Content-type', 'application/json')
self.end_headers()
self.wfile.write(bytes(json.dumps({'status': 0}), 'utf-8'))
else:
self.send_error(404)
self.end_headers()
def do_GET(self):
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', str(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', str(len(frame)))
self.end_headers()
self.wfile.write(frame)
self.wfile.write(b'\r\n')
except Exception as e:
logging.warning(
'Removed streaming client %s: %s',
self.client_address, str(e))
else:
self.send_error(404)
self.end_headers()
class StreamingServer(socketserver.ThreadingMixIn, server.HTTPServer):
allow_reuse_address = True
daemon_threads = True
output = StreamingOutput()
queue = Queue()
class PiHttpStream(ServerInterface):
def get_name(self) -> str:
return format(f'picamera http connection')
def connect(self):
try:
self.server = StreamingServer(self.address, StreamingHandler)
threading.Thread(target=self.server.serve_forever, daemon=True).start()
self._connected = True
print(f'Server started on {self.server.server_address}')
except Exception as e:
print(f'Error with {self.get_name()}: {e}')
self.disconnect()
raise ConnectionError
def disconnect(self):
if self.server:
self.server.server_close()
self._connected = False
def is_connected(self) -> bool:
return self._connected
def write(self, message):
pass
def __init__(self, config: ProjectConfig):
# initialize the camera and stream
self.camera = PiCamera()
self.camera.resolution = (int(config.get('RES_WIDTH')), int(config.get('RES_HEIGHT')))
self.camera.framerate = int(config.get('FRAMERATE'))
self.server = None
self.address = (config.get('IP_ADDRESS'), int(config.get('PICAM_PORT')))
time.sleep(2.0)
self.camera.start_recording(output, format='mjpeg')
self._connected = False
def read(self):
label = queue.get()
print(f'Received from POST request: {label}')
return label