JACK <--> ALSA PCM plugin

=========================

This plugin converts the ALSA API over JACK (Jack Audio Connection

Kit, http://jackit.sf.net) API.  ALSA native applications can work

transparently together with jackd for both playback and capture.

	ALSA apps (playback) -> ALSA-lib -> JACK plugin -> JACK deamon

	ALSA apps (capture) <- ALSA-lib <- JACK plugin <- JACK daemon

This plugin provides the PCM type "jack".  The typical configuration

looks like below:

	pcm.jack {

		type jack

		playback_ports {

			0 alsa_pcm:playback_1

			1 alsa_pcm:playback_2

		}

		capture_ports {

			0 alsa_pcm:capture_1

			1 alsa_pcm:pcapture_2

		}

	}

Put the above to ~/.asoundrc (or /etc/asound.conf), and use "jack" PCM

with your ALSA apps.  For example,

	% aplay -Djack foo.wav

The jack plugin can have two config options: playback_ports and

capture_ports.  Both are compound type config, including the following

format:

	{

		channel	port-name

		channel port-name

		...

	}

The first argument is the channel number (zero-based) and the second

is the corresponding JACK port name.

The plugin is installed in /usr/lib/alsa-lib directory as default,

which is the default search path of additional plugins for alsa-lib.

On a 64bit system like x86-64, the proper prefix option (typically,

--prefix=/usr/lib64) must be given to configure script.