Differences between version 8 and revision by previous author of AlsaNotes.
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| Newer page: | version 8 | Last edited on Monday, November 3, 2003 5:45:20 pm | by AlastairPorter | Revert |
| Older page: | version 6 | Last edited on Friday, September 26, 2003 6:43:16 pm | by AristotlePagaltzis | Revert |
@@ -19,13 +19,59 @@
You will need to get your hands dirty a bit. Install the [SRPM]:
rpm -ivh alsa-driver.x.y.z-p.src.rpm
-Now open the __alsa-driver.x.y.z-p.spec__ in the __SPECS/__ directory, locate the __%configure__ and __make__ commands and the following command between them.
+Now open the __alsa-driver.x.y.z-p.spec__ in the __SPECS/__ directory, locate the __%configure__ and __make__ commands and add
the following command between them.
touch include/linux/workqueue.h
Finally, [RPM] needs to be told to build the ''spec file'':
rpmbuild -bb --define 'cards als4000' --target $arch alsa-driver.x.y.z-p.spec
You can now install the [RPM]s built in the __RPMS/$arch/__ directory.
+
+!!! Software Mixing With Alsa
+
+You can get alsa to do software mixing for you without having to resort to something like ESounD. This is done via the dmix plugin and is documented [here|http://alsa.opensrc.org/index.php?page=DmixPlugin]. Basically, all you need to do is get alsa going, then put the following in a .asoundrc file in your home directory.
+
+ # .asoundrc file. Put this in your home directory.
+
+ pcm.mixed {
+ type dmix
+ ipc_key 123456 # Any unique value
+ ipc_key_add_uid true # No idea...
+ slave {
+ pcm "hw:0,0"
+ # Apparently for OSS emulation device, you have to set the period
+ # and the buffer sizes in powers of two.
+ period_time 0
+ period_size 1024 # must be power of 2
+ buffer_size 4096 # ditto
+ rate 44100
+ }
+
+ # bindings are cool. This says, that only the first
+ # two channels are to be used by dmix, which is enough for
+ # (most) oss apps and also lets multichannel chios work
+ # much faster:
+
+ bindings {
+ 0 0 # from 0 => to 0
+ 1 1 # from 1 => to 1
+ }
+ }
+
+ pcm.!default {
+ type plug
+ slave.pcm mixed
+ }
+
+ pcm.dsp0 {
+ type plug
+ slave.pcm mixed
+ }
+
+ pcm.mixer0 {
+ type hw
+ card 0
+ }
