Matrix:Module-cs4281 - Revision history

Y2kbug: modinfo: "0 = disabled" corrected

2008-01-24T13:24:34Z

modinfo: "0 = disabled" corrected

Y2kbug: Categories: x86, PowerPC; Template:Modinfo

2008-01-24T13:23:46Z

Categories: x86, PowerPC; Template:Modinfo

Y2kbug: created as specified, Modinfo: Ubuntu 7.04, Kernel 2.6.20-16-generic; rest moved to /* User information */

2007-08-13T06:47:26Z

created as specified, Modinfo: Ubuntu 7.04, Kernel 2.6.20-16-generic; rest moved to - ‎User information

EliotBlennerhassett: remove ref to old website

2007-08-12T02:56:42Z

remove ref to old website

Sbjaved: Enabling Software Mixing

2007-07-02T11:44:09Z

Enabling Software Mixing

New page

'''Enabling Software Mixing for Cirrus Logic CS4281'''

(I'm not a Linux Guru so this guide is to be used at own risk. It worked for me. Tested on Ubuntu 7.04)

"http://www.alsa-project.org/alsa-doc/doc-php/asoundrc.php?company=Generic&card=Generic&chip=Generic&module=Generic"

Since this card doesnot support Hardware Mixing under ALSA, you need to allow "Software Mixing". Software Mixing is the ability to play multiple sound files or applications at the same time through the same device.

'''dmix'''

These days we have a native plugin for ALSA called the dmix (direct mixing) plugin. It allows software mixing in an easy to use syntax and without the hassle of installing/understanding a new application first.

A very interesting and potentially extremely useful aspect of this plugin is using it combined with the default plugin name. In theory this means all applications that have native ALSA support will share the sound device. In practice not many applications are able to take advantage of this functionality yet. However if you have time to test and report your findings to the application developers it is worth a try:

But first you need to know a bit about the file where we will store dmix configuration.

'''The .asoundrc file'''

This file allows the you to have more advanced control over your card/device. The .asoundrc file consists of definitions of the various cards available in your system. It also gives you access to the pcm plugins in alsa-lib. These allow you to do tricky things like combine your cards into one or access multiple i/o's on your mulitchannel card.

Neither the .asoundrc nor the asound.conf files are required for ALSA to work properly. Most applications will work without them. They are used to allow extra functionality, such as routing and sample-rate conversion, through the alsa-lib layer.

Where does asoundrc live?

The asoundrc file is typically installed in a user's home directory

$HOME/.asoundrc

and is called from

/usr/share/alsa/alsa.conf

It is also possible to install a system wide configuration file as

/etc/asound.conf

When an alsa application starts both configuration files are read.

'''Enabling Software Mixing:'''

Make a file called .asoundrc in your home and/or root directory.

vi /home/xxx/.asoundrc

copy and paste the following into the file then save it.

<nowiki>pcm.!default {
type plug
slave.pcm "dmixer"
}

pcm.dmixer {
type dmix
ipc_key 1024
slave {
pcm "hw:0,0"
period_time 0
period_size 1024
buffer_size 4096
rate 44100
}
bindings {
0 0
1 1
}
}

ctl.dmixer {
type hw
card 0
}</nowiki>

Now try:

<nowiki>aplay -f cd -D default test.wav</nowiki>

on multiple consoles.

'''Some notes:'''

The dmix PCM name is already defined in the global configuration file /usr/share/alsa/alsa.conf.

- The default sample rate for this device is 48000Hz. If you would like to change it use:

aplay -D"plug:'dmix:RATE=44100'" test.wav

- An example command for dmix plugin to use 44100Hz sample-rate and hw:1,0 output device:

aplay -Dplug:\'dmix:SLAVE=\"hw:1,0\",RATE=44100\' test.wav

- The dmix PCM name is already defined in the global configuration file /usr/share/alsa/alsa.conf.

Defaults are:

SLAVE="hw:0,0",RATE=48000

NB the dmix plugin is not based on client/server architecture, but it writes directly to the soundcard's DMA buffer. There is no limit to the amount of instances that can be run at one time .

'''Saad Bin Javed

Jul 2, 2007'''

@@ Line 13: / Line 13: @@
 |id:ID string for CS4281 soundcard. (array of charp)
 |enable:Enable CS4281 soundcard. (array of bool)
-|dual_codec:Secondary Codec ID (0 = disabled). (array of bool)
+|dual_codec:Secondary Codec ID (0 <nowiki>=</nowiki> disabled). (array of bool)
 }}

@@ Line 1: / Line 1: @@
 {| align="right"
 | __TOC__
 |}
-{{Template:Modinfo
+{{Modinfo
 |module=cs4281
 |description=Cirrus Logic CS4281
@@ Line 14: / Line 17: @@
 {{Matrix:Soundcard|name=Crystal CS4281|module=cs4281}}
 ==User information==

← Older revision		Revision as of 06:47, 13 August 2007
Line 1:		Line 1:
		+	{\| align="right"
		+	\| __TOC__
		+	\|}
		+
		+	{{Template:Modinfo
		+	\|module=cs4281
		+	\|description=Cirrus Logic CS4281
		+	\|author=Jaroslav Kysela
		+	\|index:Index value for CS4281 soundcard. (array of int)
		+	\|id:ID string for CS4281 soundcard. (array of charp)
		+	\|enable:Enable CS4281 soundcard. (array of bool)
		+	\|dual_codec:Secondary Codec ID (0 = disabled). (array of bool)
		+	}}
		+
		+	{{Matrix:Soundcard\|name=Crystal CS4281\|module=cs4281}}
		+	==User information==
		+
	'''Enabling Software Mixing for Cirrus Logic CS4281'''		'''Enabling Software Mixing for Cirrus Logic CS4281'''

← Older revision		Revision as of 02:56, 12 August 2007
Line 2:		Line 2:

	(I'm not a Linux Guru so this guide is to be used at own risk. It worked for me. Tested on Ubuntu 7.04)		(I'm not a Linux Guru so this guide is to be used at own risk. It worked for me. Tested on Ubuntu 7.04)
−
−	~~"http://www.alsa-project.org/alsa-doc/doc-php/asoundrc.php?company=Generic&card=Generic&chip=Generic&module=Generic"~~

	Since this card doesnot support Hardware Mixing under ALSA, you need to allow "Software Mixing". Software Mixing is the ability to play multiple sound files or applications at the same time through the same device.		Since this card doesnot support Hardware Mixing under ALSA, you need to allow "Software Mixing". Software Mixing is the ability to play multiple sound files or applications at the same time through the same device.