Ices Manual
   __________
   
    A. Introduction
    B. What's it for?
    C. What can it do?
         1. Cue file 
         2. Signal Handling 
         3. Playlist Handling 
         4. Reencoding 
	 5. Vorbis, FLAC and MP4 transcoding
	 6. Crossfading
    D. Configuring 
         1. Command line options 
         2. Configuration file (ices.conf) 
    E. Licensing 
    F. Developers resources 
                                  _______
   
    A. Introduction
       For a very long time, the only good streaming tool for command
       line systems was shout. Shout had a lot of issues, it was a quick
       and dirty hack, it was buggy, it was sending data too fast or too
       slow, and it was just something no one wanted to fix. So we
       rewrote it from scratch, and the next generation streamer, 'ices',
       is here. 'ices' is short for 'icesource', a source for the icecast
       server. 'ices' should be pronounced 'isis' like the egyptian
       godess of fertility. For more information about icecast, I suggest
       you check out the icecast webpage at http://www.icecast.org/.
    B. What's it for?
       ices, armed with a list of mp3 files, sends a continuous stream of
       mp3 data to an icecast server. The server is then responsible for
       accepting client connections and feeding the mp3 stream to them.
       But the stream originates in the streamer, 'ices'. The terms
       'encoder', 'streamer' and 'source' are used equivalently
       throughout this document, and throughout all the documentation in
       the streaming system.
    C. What can it do?
         1. Cue file
            The cue file holds information on the file that ices is
            currently feeding to the server. This is neat for you people
            out there who like running scripts. I myself, use the cue
            file in a tcl script, running from a eggdrop bot, on irc.
            That way I can ask the bot what song is currently playing,
            how long it is, how much of it has been played, and get
            information about the next songs on the playlist.
            The file currently has the following lines, (in this order).
               o filename
               o size (in bytes)
               o bitrate (in kbits/s)
               o minutes:seconds (total song length)
               o percent played (i.e 25, no %-sign)
               o playlist line index (i.e 3, if we're playing the 4:th
                 line in the internal playlist. Logical, huh? ) Also, for
                 you scripting people, when ices starts, it writes its
                 process id to the file ices.pid.
               o ID3 Artist
               o ID3 Title
         2. Signal handling
               o Sending SIGINT to ices will make it exit.
               o Sending SIGHUP to ices will make it close and reopen the
                 logfile.
         3. Reencoding
            If compiled with support for reencoding using libmp3lame, and
            you supply the -R command line option or set the
            Execution/Reencode to 1 in the XML config file, then ices
            will start reencoding your files on the fly to the bitrate
            you specified with the -b option or the Stream/Bitrate tag.
            The sample rate, number of channels, etc, will be chosen on
            the fly by lame itself, unless you specify something using
            the -H and -N options.
            If you want to change it, I suggest you add support for this
            to ices and mail me a patch.
            I think you should be fine with whatever lame chooses though.
            Also, please make sure that your files are ok before you
            start reencoding them with ices. This is because the mpglib
            part of lame (what does the decoding) is rather unstable and
            will call exit(0) when errors are encountered.
            This will make ices exit, which is kinda bad :)
	    You'll need at least lame 3.88beta, and current CVS is a bit
	    better.
         4. Playlist handling
            About 96% of all emails I got about shout was people asking
            me to add small changes to shout playlist handling to suit
            their specific needs. This is course is not how I want to
            spend my life :) Shout had a feature to call an external
            program with a system() call, before each song, and that
            could possibly modify the playlist. This was rather ugly, but
            did the trick. In ices, we take this a step further an
            include scripting support inside the program. You can write
            your own playlist handler in perl or python, whatever you
            prefer. Your script module has to define 5 functions; test,
            init, shutdown, get_next, and get_current_lineno. I suggest
            you take a look in the distributed module files and just
            expand on that.
	 5. Vorbis, FLAC and MP4 transcoding
            If compiled with the appropriate libraries, ices can transcode
            Ogg Vorbis, FLAC and MP4 (AAC) audio files to MP3 on the fly. Keep
	    your sources in whatever format you like best.
	 6. Crossfading
	    If compiled with reencoding support, ices can also crossfade
            between tracks, giving you that pro radio station sound.
    D. Configuring
       ices can do everything shout could do, and more. It can be
       configured through hard coded defaults, a configfile, and command
       line options. The configfile is in XML, but don't get scared and
       run off. Just edit the distributed configfile and change the
       values you need. The command line options should be familiar to
       old shout users, although some options have been renamed.
         1. Command line options
            Options:
               o -B (Background (daemon mode))
               o -b <stream bitrate>
               o -C <crossfade seconds>
               o -c <configfile>
               o -D <base directory>
               o -d <stream description>
               o -f <dumpfile on server>
               o -F <playlist>
               o -g <stream genre>
               o -h <host>
               o -i (use icy headers)
               o -M <interpreter module>
               o -m <mountpoint>
               o -n <stream name>
               o -p <port>
               o -P <password>
               o -r (randomize playlist)
               o -s (private stream)
               o -S <perl|python|builtin>
               o -u <stream url>
               o -N <Reencoded number of channels>
               o -H <Reencoded sample rate>
         2. Configuration file (icec.conf)
            Here's a sample configuration file. It's the same as the
            ices.conf.dist that is included in the ices distribution.

                        <?xml version="1.0"?>
                        <ices:Configuration xmlns:ices="http://www.icecast.org/
projects/ices">
                        <Playlist>
                                <File>apan.txt</File>
                                <Randomize>1</Randomize>
                                <Type>builtin</Type>
                                <Module>ices</Module>
				<Crossfade>0</Crossfade>
                        </Playlist>
                        <Server>
                                <Hostname>localhost</Hostname>
                                <Port>8000</Port>
                                <Password>letmein</Password>
                                <Protocol>http</Protocol>
                        </Server>
                        <Execution>
                                <Background>0</Background>
                                <Verbose>1</Verbose>
                                <BaseDirectory>/tmp</BaseDirectory>
                                <Reencode>0</Reencode>
                                <Samplerate>-1</Samplerate>
                                <Channels>-1</Channels>
                        </Execution>
                        <Stream>
                                <Name>Cool ices default name from XML</ice
s:Name>
                                <Genre>Cool ices genre from XML</Genr
e>
                                <Description>Cool ices description from XM
L</Description>
                                <URL>Cool ices URL from XML</URL>
                                <Bitrate>128</Bitrate>
                                <Public>1</Public>
                        </Stream>
                        </ices:Configuration>
                         3. Configurations options
            This describes all the different options in ices.
               o Server Hostname
                 Command line option: -h <host>
                 Config file tag: Server/Hostname
                 This is the name, or ip, of the host ices should connect
                 to. It has to run a streaming server, capable of the
                 xaudiocast or icy protocol.
                 This value defaults to localhost.
               o Server Port
                 Command line option: -p <port>
                 Config file tag: Server/Port
                 This is the port the server is listening on, by default
                 8000.
               o Server Password
                 Command line option: -P <password>
                 Config file tag: Server/Password
                 The encoder password for the server. If this is not
                 correct, then ices cannot log in on the server, and ices
                 will exit.
               o Server Protocol
                 Command line option: -i for icy-headers
                 Config file tag: Server/Protocol
                 Either xaudiocast or icy. Use xaudiocast if you can, and
                 icy if you must.
               o Execution Background
                 Command line option: -B
                 Config file tag: Execution/Background
                 This will launch ices in the background, as a daemon.
               o Execution Verbose
                 Command line option: -v
                 Config file tag: Execution/Verbose
                 Normally ices outputs what stream is playing and a small
                 amount of extra information. With verbose turned on, you
                 get a whole lot of debugging information and lots of
                 track info.
               o Execution Base Directory
                 Command line option: -D <directory>
                 Config file tag: Execution/BaseDirectory
                 ices uses this directory for cue files, log files and
                 temporary playlist files. You need write permissions in
                 this directory. The default is /tmp
               o Execution Reencode
                 Command line option: -R (turns reencoding on)
                 Config file tag: Execution/Reencode
                 When you turn this option on, ices (if compiled with
                 libmp3lame support) will reencode your mp3 files on the
                 fly to whatever bitrate you specify with the Stream
                 Bitrate option.
                 PLEASE note that if your files are corrupt, this might
                 crash ices because the library used to decode (mpglib)
                 is not very stable. I suggest you check your files with
                 mp3check or some other mp3 verification program before
                 you add them to your playlist. Just popping them into
                 your favourite player and checking the sound is
                 definately not enough.
                 For legal reasons, this option is not available on the
                 binary distributions.
               o Execution Samplerate
                 Command line option: -H <samplerate>
                 Config file tag: Execution/Samplerate
                 Use this to force liblame reencoding to output mp3 data
                 with this samplerate.
               o Execution Channels
                 Command line option: -N <number of channels>
                 Config file tag: Execution/Channels
                 Use this to force liblame reencoding to output mp3 data
                 with this many channels.
               o Stream Mountpoint
                 Command line option: -m <mount point>
		 Config file tag: Stream/Mountpoint
                 This is the name of the mountpoint for this stream on the
                 icecast server. Clients can access this stream at
		 http://host:port/<mount point>.
                 NOTE: This option does nothing if you are running in shoutcast
                 compatibility mode.
               o Stream Name
                 Command line option: -n <stream name>
                 Config file tag: Stream/Name
                 This is the name of the stream, not to be confused with
                 the name of the song playing.
               o Stream Genre
                 Command line option: -g <stream genre>
                 Config file tag: Stream/Genre
                 This is the genre of your stream, e.g Jazz or Static.
               o Stream Description
                 Command line option: -d <stream description>
                 Config file tag: Stream/Description
                 This option is a description of your stream.
               o Stream URL
                 Command line option: -u <URL>
                 Config file tag: Stream/URL
                 This should be a URL describing your stream.
               o Stream Bitrate
                 Command line option: -b <bitrate>
                 Config file tag: Stream/Bitrate
                 If you turn on reencoding then this will be the bitrate
                 of the stream, otherwize the actual bitrate of the
                 stream is the bitrate your files are encoded at, and
                 this value is for displaying purposes only.
                 Read the last 3 lines again, please.
               o Stream Public
                 Command line option: -s (makes stream private)
                 Config file tag: Stream/Public
                 This regulates whether the icecast server will display
                 your stream on a directory server. Default is 1 (yes).
               o Playlist File
                 Command line option: -F <file>
                 Config file tag: Playlist/File
                 This is the file where ices originally looks for files
                 to play.
                 When using playlist modules in perl or python, this
                 argument is passed to the playlist handler.
               o Playlist Randomize
                 Command line option: -r (randomizes file)
                 Config file tag: Playlist/Randomize
                 This option is passed to the playlist handler, and tells
                 it to randomize the playlist.
               o Playlist Type
                 Command line option: -S <perl|python|builtin>
                 Config file tag: Playlist/Type
                 By default, ices using a builtin playlist handler. It
                 handles randomization and not much more. Most people
                 want sophisticated playlist handlers that interface
                 databases and keeps track of god knows what. ices
                 handles embedded python and embedded perl, so now you
                 can write your own modules, without modifying ices, that
                 does just about anything. Use this option to change the
                 playlist handler type from builtin (default), to python
                 or perl.
               o Playlist Module
                 Command line option: -M <module>
                 Config file tag: Playlist/Module
                 Use this option to execute a different python or perl
                 module than the default.
                 Default for python is ices.py and default for perl is
                 ices.pm, although do NOT specify the file extension for
                 the module. Use 'whatever' instead of 'whatever.pm' or
                 'whatever.py'
	       o Playlist Crossfade
                 Command line option: -C <crossfade secs>
                 Config file tag: Playlist/Crossfade
                 If this is greater than zero, and you have reencoding support,
                 ices will crossfade the specified number of seconds between tracks.
    E. Licensing
       ices is licensed under the Gnu General Public License, and for
       more info about that I suggest you read the file named COPYING.
    F. Developers resources
       If you want to write your own streaming software, or perhaps a
       nice streaming mp3 client, go to developer.icecast.org.
                                  _______
   
    This document was originally written by Alexander Haväng [[email protected]].