[ltp] T40 and ALSA, but no multi channel mixing

[Luke Yelavich]

On Fri, Aug 20, 2004 at 11:22:52PM EST, Alex Deucher wrote:
> On Fri, 20 Aug 2004 10:53:31 +0200, Roman Joost <roman@bromeco.de> wrote:
> > pcm.amix {
> >     type dmix
> >     ipc_key 50557
> >     slave {
> >         pcm "hw:0,0"
> >         period_time 0
> >         period_size 1024
> >         buffer_size 8192
> >     }
> >     bindings {
> >         0 0
> >         1 1
> >     }
> > }
> > pcm.!default { # route ALSA software through pcm.amix
> >     type plug
> >     slave.pcm "amix"
> > }
> > pcm.dsp0 {  # oss software as well
> >     type plug
> >     slave.pcm "amix"
> > }
> > 
> > ctl.mixer0 {
> >     type hw
> >     card 0
> > }
> > 
> > Unfortunately, same problem; no multi channel mixing (or however you
> > want to call it). Another curiosity is, that if I try to play two mp3's
> > with mplayer and alsa output, it only works for the first one. The
> > second mplayer waits for the device to become free. I thought, that this
> > should work for ALSA?
> 
> I'm not really an expert when it comes to sound, but it's my
> understanding that to mix multiple streams you either need a sound
> daemon like esd or a sound chip that supports multiple streams in
> hardware like the SB live! or audigy cards.

Yes, you could do that, but ALSA has a plugin called dmix, which does this at
a lower level. This means that you don't need anything like esd or artsd to
manage your audio.

Luke