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222 lines
11 KiB
Python
222 lines
11 KiB
Python
# This file is part of the OpenMV project.
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#
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# Copyright (c) 2013-2020 Ibrahim Abdelkader <iabdalkader@openmv.io>
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# Copyright (c) 2013-2020 Kwabena W. Agyeman <kwagyeman@openmv.io>
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#
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# This work is licensed under the MIT license, see the file LICENSE for details.
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import network, pyb, re, socket, struct
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class rtsp_server:
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def __valid_tcp_socket(self): # private
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if self.__tcp__socket is None:
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try:
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.bind(self.__myaddr)
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s.listen(0)
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s.settimeout(5)
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self.__tcp__socket, self.__client_addr = s.accept()
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s.close()
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except OSError: self.__tcp__socket = None
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return self.__tcp__socket is not None
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def __close_tcp_socket(self): # private
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self.__tcp__socket.close()
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self.__tcp__socket = None
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def __valid_udp_socket(self): # private
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if self.__udp__socket is None:
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try:
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self.__udp__socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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self.__udp__socket.bind((self.__myip, self.__client_rtp_port))
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except OSError: self.__udp__socket = None
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return self.__udp__socket is not None
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def __close_udp_socket(self): # private
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self.__udp__socket.close()
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self.__udp__socket = None
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def __init__(self, network_if, port=554): # private
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self.__network = network_if
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self.__myip = self.__network.ifconfig()[0]
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self.__myaddr = (self.__myip, port)
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self.__tcp__socket = None
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self.__udp__socket = None
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self.__setup_cb = None
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self.__play_cb = None
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self.__pause_cb = None
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self.__teardown_cb = None
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self.__pathname = ""
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self.__session = pyb.rng()
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self.__transport_is_tcp = False
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self.__client_rtp_addr = None
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self.__playing = False
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self.__sequence_number = pyb.rng() & 0xFFFF
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self.__ssrc = pyb.rng()
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print("IP Address:Port %s:%d\nRunning..." % self.__myaddr)
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def register_setup_cb(self, cb): # public
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self.__setup_cb = cb
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def register_play_cb(self, cb): # public
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self.__play_cb = cb
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def register_pause_cb(self, cb): # public
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self.__pause_cb = cb
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def register_teardown_cb(self, cb): # public
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self.__teardown_cb = cb
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def __send_rtsp_response(self, code, name, extra=""): # private
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self.__tcp__socket.send("RTSP/1.0 %d %s\r\n%s\r\n" % (code, name, extra))
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def __send_rtsp_response_cseq(self, code, name, seq, extra=""): # private
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self.__send_rtsp_response(code, name, "CSeq: %d\r\n%s" % (seq, extra))
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def __send_rtsp_response_ok(self, seq, extra=""): # private
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self.__send_rtsp_response_cseq(200, "OK", seq, extra)
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def __parse_rtsp_request(self, data): # private
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if data[0] == 0x24: return # Interleaved RTCP Packet
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if data[0] >= 0x80: return # Ressambled TCP
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s = list(filter(lambda x: x and not x.startswith("User-Agent"), data.decode().splitlines()))
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if s and len(s) >= 2:
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line0 = s[0].split(' ')
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request = line0[0]
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self.__pathname = re.sub("rtsp(u)?://[a-zA-Z0-9\-\.]+(:\d+)?(/)?", '/', line0[1])
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if self.__pathname != '/' and self.__pathname.endswith('/'):
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self.__pathname = self.__pathname[:-1]
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if line0[2] == "RTSP/1.0":
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if len(s) >= 3 and s[1].split(' ')[0] != "CSeq:":
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for i in range(2, len(s)):
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if s[i].split(' ')[0] == "CSeq:":
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temp = s[i]
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s[i] = s[1]
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s[1] = temp
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break
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line1 = s[1].split(' ')
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if line1[0] == "CSeq:":
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seq = int(line1[1])
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if request == "OPTIONS":
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if len(s) >= 3:
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m = re.match("(Proxy-)?Require: (\S)+", s[2])
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if m:
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self.__send_rtsp_response_cseq(551, "Option not supported", seq, "Unsupported: %s\r\n" % m.group(2))
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return
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self.__send_rtsp_response_ok(seq, "Public: DESCRIBE, SETUP, PLAY, PAUSE, TEARDOWN\r\n")
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return
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elif request == "DESCRIBE":
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payload = "v=0\r\no=- %d %d IN IP4 %s\r\ns=OpenMV Video\r\nt=0 0\r\nm=video 0 RTP/AVP 26" % (pyb.rng(), pyb.rng(), self.__myip)
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self.__send_rtsp_response_ok(seq, "Content-Type: application/sdp\r\nContent-Length: %d\r\n\r\n%s" % (len(payload) + 2, payload))
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return
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elif request == "SETUP":
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if len(s) >= 3:
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m = re.match("Transport: RTP/AVP(/UDP)?;unicast;client_port=(\d+)-(\d+)", s[2])
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if m:
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self.__transport_is_tcp = False
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self.__client_rtp_port = int(m.group(2))
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self.__client_rtcp_port = int(m.group(3))
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self.__client_rtp_addr = (self.__client_addr[0], self.__client_rtp_port)
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self.__client_rtcp_addr = (self.__client_addr[0], self.__client_rtcp_port)
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self.__session = pyb.rng()
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self.__ssrc = pyb.rng()
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self.__send_rtsp_response_ok(seq, "%s;server_port=%d-%d;ssrc=%d\r\nSession: %d\r\n" % (s[2], self.__client_rtp_port, self.__client_rtcp_port, self.__ssrc, self.__session))
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if self.__setup_cb: self.__setup_cb(self.__pathname, self.__session)
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return
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m = re.match("Transport: RTP/AVP/TCP;unicast;interleaved=(\d+)-(\d+)", s[2])
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if m:
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self.__transport_is_tcp = True
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self.__client_rtp_channel = int(m.group(1))
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self.__client_rtcp_channel = int(m.group(2))
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self.__session = pyb.rng()
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self.__ssrc = pyb.rng()
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self.__send_rtsp_response_ok(seq, "%s\r\nSession: %d\r\n" % (s[2], self.__session))
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if self.__setup_cb: self.__setup_cb(self.__pathname, self.__session)
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return
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elif request == "PLAY":
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s = list(filter(lambda x: x and not x.startswith("Range"), s))
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if len(s) >= 3:
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m = re.match("Session: (\d+)", s[2])
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if m:
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self.__playing = True
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self.__send_rtsp_response_ok(seq, "RTP-Info: url=%s;seq=%d\r\n" % (line0[1], self.__sequence_number))
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if self.__play_cb: self.__play_cb(self.__pathname, int(m.group(1)))
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return
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elif request == "PAUSE":
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if len(s) >= 3:
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m = re.match("Session: (\d+)", s[2])
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if m:
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self.__playing = False
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self.__send_rtsp_response_ok(seq)
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if self.__pause_cb: self.__pause_cb(self.__pathname, int(m.group(1)))
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return
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elif request == "TEARDOWN":
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if len(s) >= 3:
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m = re.match("Session: (\d+)", s[2])
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if m:
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self.__playing = False
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self.__send_rtsp_response_ok(seq)
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if self.__teardown_cb: self.__teardown_cb(self.__pathname, int(m.group(1)))
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return
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else:
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self.__send_rtsp_response_cseq(501, "Not Implemented", seq)
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return
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self.__send_rtsp_response(400, "Bad Request")
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def __valid_socket(self): # private
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if self.__transport_is_tcp: return self.__client_rtp_channel is not None
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else: return self.__valid_udp_socket() and self.__client_rtp_addr is not None
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def __settimeout(self, timeout): # private
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if self.__transport_is_tcp: self.__tcp__socket.settimeout(timeout)
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else: self.__udp__socket.settimeout(timeout)
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def __send(self, data): # private
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if self.__transport_is_tcp: return self.__tcp__socket.send(struct.pack(">BBH", 0x24, self.__client_rtp_channel, len(data)) + data)
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else: return self.__udp__socket.sendto(data, self.__client_rtp_addr)
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def __close_socket(self): # private
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if self.__transport_is_tcp: pass
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else: self.__close_udp_socket()
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def __send_rtp(self, image_callback, quality): # private
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img = image_callback(self.__pathname, self.__session).compress(quality)
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if img.width() >= 2040: raise ValueError("Maximum width is 2040")
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if img.height() >= 2040: raise ValueError("Maximum height is 2040")
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i = 0
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l = img.size()
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rtp_header_size = 12
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jpeg_header_size = 8
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max_packet_size = 1400 - rtp_header_size - jpeg_header_size
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if self.__transport_is_tcp: max_packet_size -= 4
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if self.__valid_socket():
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try:
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self.__settimeout(0.1)
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timestamp = (pyb.millis() * 90) & 0xFFFFFFFF
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while l:
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rtp_header = struct.pack(">BBHII",
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0x80, 0x9A if l <= max_packet_size else 0x1A,
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self.__sequence_number, timestamp, self.__ssrc)
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self.__sequence_number = (self.__sequence_number + 1) & 0xFFFF
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jpeg_header = struct.pack(">IBBBB", i, 0, quality, int(img.width() // 8), int(img.height() // 8))
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img_data = img.bytearray()[i:i+min(l, max_packet_size)]
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img_data_len = len(img_data)
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data_len = self.__send(rtp_header + jpeg_header + img_data)
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if not data_len: break
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i += img_data_len
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l -= img_data_len
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if l: self.__close_socket()
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except OSError: self.__close_socket()
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def stream(self, image_callback, quality=90): # public
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while True:
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if self.__valid_tcp_socket():
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try:
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self.__tcp__socket.settimeout(0.1)
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while True:
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data = self.__tcp__socket.recv(1400)
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if data and len(data): self.__parse_rtsp_request(data)
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if self.__playing: self.__send_rtp(image_callback, quality)
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except OSError: self.__close_tcp_socket()
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