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<?xml version="1.0" encoding="iso-8859-1"?> <!-- -*-html-helper-*- -->
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>polypaudio: Loadable Modules</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<h1>Loadable Modules</h1>
<p>The following loadable modules are provided with the <tt>polypaudio</tt> distribution:</p>
<h2>Device Drivers</h2>
<p>All device driver modules support the following parameters:</p>
<table>
<tr><td><tt>format=</tt></td><td>The sample format (one of <tt>u8</tt>, <tt>s16</tt>, <tt>s16le</tt>, <tt>s16le</tt>, <tt>float32</tt>, <tt>float32be</tt>, <tt>float32le</tt>, <tt>alaw</tt>, <tt>ulaw</tt>) (defaults to <tt>s16</tt>)</td></tr>
<tr><td><tt>rate=</tt></td><td>The sample rate (defaults to 44100)</td></tr>
<tr><td><tt>channels=</tt></td><td>Audio channels (defaults to 2)</td></tr>
<tr><td><tt>sink_name=</tt>, <tt>source_name=</tt></td><td>Name for the sink (resp. source)</td></tr>
</table>
<h3>module-pipe-sink</h3>
<p>Provides a simple test sink that writes the audio data to a FIFO
special file in the file system. The sink name defaults to <tt>pipe_output</tt>.</p>
<p>The following option is supported:</p>
<table>
<tr><td><tt>file=</tt></td><td>The name of the FIFO special file to use. (defaults to: <tt>/tmp/music.output</tt>)</td></tr>
</table>
<h3>module-pipe-source</h3>
<p>Provides a simple test source that reads the audio data from a FIFO
special file in the file system. The source name defaults to <tt>pipe_input</tt>.</p>
<p>The following option is supported:</p>
<table>
<tr><td><tt>file=</tt></td><td>The name of the FIFO special file to use. (defaults to: <tt>/tmp/music.input</tt>)</td></tr>
</table>
<a name="module-alsa-sink"/>
<h3>module-alsa-sink</h3>
<p>Provides a playback sink for devices supported by the <a href="http://www.alsa-project.org/">Advanced Linux
Sound Architecture</a> (ALSA). The sink name defaults to <tt>alsa_output</tt>.</p>
<p>In addition to the general device driver options described above this module supports:</p>
<table>
<tr><td><tt>device=</tt></td><td>The ALSA device to use. (defaults to "plughw:0,0")</td></tr>
<tr><td><tt>fragments=</tt></td><td>The desired fragments when opening the device. (defaults to 12)</td></tr>
<tr><td><tt>fragment_size=</tt></td><td>The desired fragment size in bytes when opening the device (defaults to 1024)</td></tr>
</table>
<h3>module-alsa-source</h3>
<p>Provides a recording source for devices supported by the Advanced
Linux Sound Architecture (ALSA). The source name defaults to <tt>alsa_input</tt>.</p>
<p>This module supports <tt>device=</tt>, <tt>fragments=</tt> and <tt>fragment_size=</tt> arguments the same way as <a href="#module-alsa-sink"><tt>module-alsa-sink</tt></a>.</p>
<a name="module-oss"/>
<h3>module-oss</h3>
<p>Provides both a sink and a source for playback, resp. recording on
<a href="http://www.opensound.com">Open Sound System</a> (OSS) compatible devices.</p>
<p>This module supports <tt>device=</tt> (which defaults to <tt>/dev/dsp</tt>), <tt>fragments=</tt> and <tt>fragment_size=</tt> arguments the same way as <a href="#module-alsa-sink"><tt>module-alsa-sink</tt></a>.</p>
<p>In addition this module supports the following options:</p>
<table>
<tr><td><tt>record=</tt></td><td>Accepts a binary numerical value for enabling (resp. disabling) the recording on this device. (defaults: to 1)</td></tr>
<tr><td><tt>playback=</tt></td><td>Accepts a binary numerical value for enabling (resp. disabling) the playback on this device. (defaults: to 1)</td></tr>
</table>
<p>The sink name (resp. source name) defaults to <tt>oss_output</tt> (resp. <tt>oss_input</tt>).</p>
<h3>module-oss-mmap</h3>
<p>Similar to <tt>module-oss</tt> but uses memory mapped
(<tt>mmap()</tt>) access to the input/output buffers of the audio
device. This provides better latency behaviour but is not as
compatible as <tt>module-oss</tt>.</p>
<p>This module accepts exactly the same arguments as <a href="#module-oss"><tt>module-oss</tt></a>.</p>
<h3>module-combine</h3>
<p>This combines two or more sinks into one. A new virtual sink is
allocated. All data written to it is forwarded to all connected
sinks. In aequidistant intervals the sample rates of the output sinks
is recalculated: i.e. even when the sink's crystals deviate (which is
normally the case) output appears synchronously to the human ear. The
resampling required for this may be very CPU intensive.</p>
<table>
<tr><td><tt>sink_name=</tt></td><td>The name for the combined sink. (defaults to <tt>combined</tt>)</td></tr>
<tr><td><tt>master=</tt></td><td>The name of the first sink to link into the combined think. The sample rate/type is taken from this sink.</td></tr>
<tr><td><tt>slaves=</tt></td><td>Name of additional sinks to link into the combined think, seperated by commas.</td></tr>
<tr><td><tt>adjust_time=</tt></td><td>Time in seconds when to readjust the sample rate of all sinks. (defaults to 20)</td></tr>
<tr><td><tt>resample_method=</tt></td><td>Resampling algorithm to
use. See <tt>libsamplerate</tt>'s documentation for more
information. Use one of <tt>sinc-best-quality</tt>,
<tt>sinc-medium-quality</tt>, <tt>sinc-fastest</tt>,
<tt>zero-order-hold</tt>, <tt>linear</tt>. If the default happens to
be to slow on your machine try using <tt>zero-order-hold</tt>. This
will decrease output quality however. (defaults to
<tt>sinc-fastest</tt>)</td></tr> </table>
<h2>Protocols</h2>
<a name="module-cli"/>
<h3>module-cli</h3>
<p>Provides the user with a simple command line interface on the
controlling TTY of the daemon. This module may not be loaded more than
once.</p>
<p>For an explanation of the simple command line language used by this
module see <a href="cli.html"><tt>cli.html</tt></a>.
<p>This module doesn't accept any arguments.</p>
<a name="module-cli-protocol-unix"/>
<a name="module-cli-protocol-tcp"/>
<a name="module-cli-protocol"/>
<h3>module-cli-protocol-{unix,tcp}</h3>
<p>An implemenation of a simple command line based protocol for
controlling the <tt>polypaudio</tt> daemon. If loaded, the user may
connect with tools like <tt>netcat</tt>, <tt>telnet</tt> or
<a href="http://0pointer.de/lennart/projects/bidilink/"><tt>bidilink</tt></a> to the listening sockets and execute commands the
same way as with <tt>module-cli</tt>.</p>
<p><b>Beware!</b> Users are not authenticated when connecting to this
service.</p>
<p>This module exists in two versions: with the suffix <tt>-unix</tt>
the service will listen on an UNIX domain socket in the local file
system. With the suffix <tt>-tcp</tt> it will listen on a network
transparent TCP/IP socket.</p>
<p>This module supports the following options:</p>
<table>
<tr><td><tt>port=</tt></td><td>(only for <tt>-tcp</tt>) The port number to listen on (defaults to 4712)</td></tr>
<tr><td><tt>loopback=</tt></td><td>(only for <tt>-tcp</tt>) Accepts
a numerical binary value. If 1 the socket is bound to the loopback
device, i.e. not publicly accessible. (defaults to 1)</td></tr>
<tr><td><tt>socket=</tt></td><td>(only for <tt>-unix</tt>) The UNIX socket name (defaults to <tt>/tmp/polypaudio/cli</tt>)</td></tr>
</table>
<h3>module-simple-protocol-{unix,tcp}</h3>
<p>An implementation of a simple protocol which allows playback by using
simple tools like <tt>netcat</tt>. Just connect to the listening
socket of this module and write the audio data to it, or read it from
it for playback, resp. recording.</p>
<p><b>Beware!</b> Users are not authenticated when connecting to this
service.</p>
<p>See <tt>module-cli-protocol-{unix,tcp}</tt> for more information
about the two possible suffixes of this module.</p>
<p>In addition to the options supported by <a href="module-cli-protocol"><tt>module-cli-protocol-*</tt></a>, this module supports:</p>
<table>
<tr><td><tt>rate=</tt>, <tt>format=</tt>, <tt>channels=</tt></td><td>Sample format for streams connecting to this service.</td></tr>
<tr><td><tt>playback=</tt>, <tt>record=</tt></td><td>Enable/disable playback/recording</td></tr>
<tr><td><tt>sink=</tt>, <tt>source=</tt></td><td>Specify the sink/source this service connects to</td></tr>
</table>
<h3>module-esound-protocol-{unix,tcp}</h3>
<p>An implemenation of a protocol compatible with the <a
href="http://www.tux.org/~ricdude/EsounD.html">Enlightened Sound
Daemon</a> (ESOUND, <tt>esd</tt>). When you load this module you may
access the <tt>polypaudio</tt> daemon with tools like <tt>esdcat</tt>,
<tt>esdrec</tt> or even <tt>esdctl</tt>. Many applications, such as
XMMS, include support for this protocol.</p>
<p>See <tt>module-cli-protocol-{unix,tcp}</tt> for more information
about the two possible suffixes of this module.</p>
<p>In addition to the options supported by <a href="module-cli-protocol"><tt>module-cli-protocol-*</tt></a>, this module supports:</p>
<table>
<tr><td><tt>sink=</tt>, <tt>source=</tt></td><td>Specify the sink/source this service connects to</td></tr>
<tr><td><tt>public=</tt></td><td>If set to 0 not authentication is required to connect to the service</td></tr>
<tr><td><tt>cookie=</tt></td><td>Name of the cookie file for authentication purposes</td></tr>
</table>
<p>This implementation misses some features the original ESOUND has: e.g. there is no sample cache yet. However: XMMS works fine.</p>
<h3>module-native-protocol-{unix,tcp}</h3>
<p>The native protocol of <tt>polypaudio</tt>.</p>
<p>See <tt>module-cli-protocol-{unix,tcp}</tt> for more information
about the two possible suffixes of this module.</p>
<p>In addition to the options supported by <a href="module-cli-protocol"><tt>module-cli-protocol-*</tt></a>, this module supports:</p>
<table>
<tr><td><tt>public=</tt></td><td>If set to 0 not authentication is required to connect to the service</td></tr>
<tr><td><tt>cookie=</tt></td><td>Name of the cookie file for authentication purposes</td></tr>
</table>
<h3>module-native-protocol-fd</h3>
<p>This is used internally when auto spawning a new daemon. Don't use it directly.</p>
<h2>Miscellaneous</h2>
<h3>module-x11-bell</h3>
<p>Intercepts X11 bell events and plays a sample from the sample cache on each occurence.</p>
<table>
<tr><td><tt>display=</tt></td><td>X11 display to connect to. If ommited defaults to the value of <tt>$DISPLAY</tt></td></tr>
<tr><td><tt>sample=</tt></td><td>The sample to play. If ommited defaults to <tt>x11-bell</tt>.</td></tr>
<tr><td><tt>sink=</tt></td><td>Name of the sink to play the sample on. If ommited defaults to the default sink.</td></tr>
</table>
<h3>module-sine</h3>
<p>Creates a sink input and generates a sine waveform stream.</p>
<table>
<tr><td><tt>sink=</tt></td><td>The sink to connect to. If ommited defaults to the default sink.</td></tr>
<tr><td><tt>frequency=</tt></td><td>The frequency to generate in Hertz. Defaults to 440.</td></tr>
</table>
<h3>module-esound-compat-spawnfd</h3>
<p>This is a compatibility module for <tt>libesd</tt> based autospawning of polypaudio. Don't use it directly.</p>
<h3>module-esound-compat-spawnpid</h3>
<p>This is a compatibility module for <tt>libesd</tt> based autospawning of polypaudio. Don't use it directly.</p>
<hr/>
<address class="grey">Lennart Poettering <@PACKAGE_BUGREPORT@>, September 2004</address>
<div class="grey"><i>$Id$</i></div>
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