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Dir : ~/usr/lib/python3/dist-packages/twisted/protocols/

Edit File: shoutcast.py

# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Chop up shoutcast stream into MP3s and metadata, if available.
"""

from twisted import copyright
from twisted.web import http

class ShoutcastClient(http.HTTPClient):
    """
    Shoutcast HTTP stream.

Modes can be 'length', 'meta' and 'mp3'.

See U{http://www.smackfu.com/stuff/programming/shoutcast.html}
    for details on the protocol.
    """

userAgent = "Twisted Shoutcast client " + copyright.version

def __init__(self, path="/"):
        self.path = path
        self.got_metadata = False
        self.metaint = None
        self.metamode = "mp3"
        self.databuffer = ""

def connectionMade(self):
        self.sendCommand("GET", self.path)
        self.sendHeader("User-Agent", self.userAgent)
        self.sendHeader("Icy-MetaData", "1")
        self.endHeaders()

def lineReceived(self, line):
        # fix shoutcast crappiness
        if not self.firstLine and line:
            if len(line.split(": ", 1)) == 1:
                line = line.replace(":", ": ", 1)
        http.HTTPClient.lineReceived(self, line)

def handleHeader(self, key, value):
        if key.lower() == "icy-metaint":
            self.metaint = int(value)
            self.got_metadata = True

def handleEndHeaders(self):
        # Lets check if we got metadata, and set the
        # appropriate handleResponsePart method.
        if self.got_metadata:
            # if we have metadata, then it has to be parsed out of the data stream
            self.handleResponsePart = self.handleResponsePart_with_metadata
        else:
            # otherwise, all the data is MP3 data
            self.handleResponsePart = self.gotMP3Data

def handleResponsePart_with_metadata(self, data):
        self.databuffer += data
        while self.databuffer:
            stop = getattr(self, "handle_%s" % self.metamode)()
            if stop:
                return

def handle_length(self):
        self.remaining = ord(self.databuffer[0]) * 16
        self.databuffer = self.databuffer[1:]
        self.metamode = "meta"

def handle_mp3(self):
        if len(self.databuffer) > self.metaint:
            self.gotMP3Data(self.databuffer[: self.metaint])
            self.databuffer = self.databuffer[self.metaint :]
            self.metamode = "length"
        else:
            return 1

def handle_meta(self):
        if len(self.databuffer) >= self.remaining:
            if self.remaining:
                data = self.databuffer[: self.remaining]
                self.gotMetaData(self.parseMetadata(data))
            self.databuffer = self.databuffer[self.remaining :]
            self.metamode = "mp3"
        else:
            return 1

def parseMetadata(self, data):
        meta = []
        for chunk in data.split(";"):
            chunk = chunk.strip().replace("\x00", "")
            if not chunk:
                continue
            key, value = chunk.split("=", 1)
            if value.startswith("'") and value.endswith("'"):
                value = value[1:-1]
            meta.append((key, value))
        return meta

def gotMetaData(self, metadata):
        """Called with a list of (key, value) pairs of metadata,
        if metadata is available on the server.

Will only be called on non-empty metadata.
        """
        raise NotImplementedError("implement in subclass")

def gotMP3Data(self, data):
        """Called with chunk of MP3 data."""
        raise NotImplementedError("implement in subclass")