EES sound chip Sound Driver

Our Goal:
	This patch has some miner problems as below.  We
	hope to fix these and at last we merge to pcm driver.

Contact:
	MIHIRA Yoshiro sanpei@sanpei.org, sanpei@jp.freebsd.org

Latest driver:
	http://www.jp.freebsd.org/~sanpei/snd-ess.tar.gz

Supported NOTE-PCs which use ESS Sound Chip:
	Sotec WinBookPro	ESS688
	Hyperbook 750+		ESS1868
	Compaq DeskPro		ESS1869
        NEC MobioNX		ESS1869
        FM/V Biblo NP/W		ESS1878
        Sony VAIO-505		ESS1878
        FM-V Biblo NC313	ESS1879
        Chandra2	        ESS1879
 	(your report are welcome)

Current Status:
	This driver support up to 44KHz/16bit mode. And
	fixed problem that sound only come out from left
	channel, buggy mixer.

Example:
		mpg123 -v mp3_filename

Old pcm and sb driver:
Audio: 2:1 conversion, rate: 22050, encoding: unsigned 8 bit, channels: 2
                             ~~~~~                     ~~~~~
This driver:
Audio: 1:1 conversion, rate: 44100, encoding: signed 16 bit, channels: 2
                             ~~~~~                   ~~~~~~
Current Problem:
	Some time (CPU was heavy load?), sound change to white
	noise.
	And also with using mpg123 player and selected some files,
	when one file is ended and change to another file,
	also sound change to white noise...

DATA SHEETS:
	http://alsa.jcu.cz/alsa/ftp/manuals/ess/