1 # Copyright (c) Twisted Matrix Laboratories.
2 # See LICENSE for details.
5 Chop up shoutcast stream into MP3s and metadata, if available.
8 from twisted.web import http
9 from twisted import copyright
12 class ShoutcastClient(http.HTTPClient):
14 Shoutcast HTTP stream.
16 Modes can be 'length', 'meta' and 'mp3'.
18 See U{http://www.smackfu.com/stuff/programming/shoutcast.html}
19 for details on the protocol.
22 userAgent = "Twisted Shoutcast client " + copyright.version
24 def __init__(self, path="/"):
26 self.got_metadata = False
31 def connectionMade(self):
32 self.sendCommand("GET", self.path)
33 self.sendHeader("User-Agent", self.userAgent)
34 self.sendHeader("Icy-MetaData", "1")
37 def lineReceived(self, line):
38 # fix shoutcast crappiness
39 if not self.firstLine and line:
40 if len(line.split(": ", 1)) == 1:
41 line = line.replace(":", ": ", 1)
42 http.HTTPClient.lineReceived(self, line)
44 def handleHeader(self, key, value):
45 if key.lower() == 'icy-metaint':
46 self.metaint = int(value)
47 self.got_metadata = True
49 def handleEndHeaders(self):
50 # Lets check if we got metadata, and set the
51 # appropriate handleResponsePart method.
53 # if we have metadata, then it has to be parsed out of the data stream
54 self.handleResponsePart = self.handleResponsePart_with_metadata
56 # otherwise, all the data is MP3 data
57 self.handleResponsePart = self.gotMP3Data
59 def handleResponsePart_with_metadata(self, data):
60 self.databuffer += data
61 while self.databuffer:
62 stop = getattr(self, "handle_%s" % self.metamode)()
66 def handle_length(self):
67 self.remaining = ord(self.databuffer[0]) * 16
68 self.databuffer = self.databuffer[1:]
69 self.metamode = "meta"
72 if len(self.databuffer) > self.metaint:
73 self.gotMP3Data(self.databuffer[:self.metaint])
74 self.databuffer = self.databuffer[self.metaint:]
75 self.metamode = "length"
79 def handle_meta(self):
80 if len(self.databuffer) >= self.remaining:
82 data = self.databuffer[:self.remaining]
83 self.gotMetaData(self.parseMetadata(data))
84 self.databuffer = self.databuffer[self.remaining:]
89 def parseMetadata(self, data):
91 for chunk in data.split(';'):
92 chunk = chunk.strip().replace("\x00", "")
95 key, value = chunk.split('=', 1)
96 if value.startswith("'") and value.endswith("'"):
98 meta.append((key, value))
101 def gotMetaData(self, metadata):
102 """Called with a list of (key, value) pairs of metadata,
103 if metadata is available on the server.
105 Will only be called on non-empty metadata.
107 raise NotImplementedError, "implement in subclass"
109 def gotMP3Data(self, data):
110 """Called with chunk of MP3 data."""
111 raise NotImplementedError, "implement in subclass"