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

[Alex Deucher]

On Fri, 20 Aug 2004 10:53:31 +0200, Roman Joost <roman@bromeco.de> wrote:
> I think, this story is really old, but I didn't get managed to it. I'm
> running Debian unstable on my T40 and can use only one sound output a
> time (eg. playing mp3s in XMMS but no sound for mozilla).
> 
> So, I was browsing the net and found the solution: asoundrc. I created
> one, which looks like this:
> 
> *****************
> 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.

Alex

> 
> Maybe someone of you guys can point me to the right direction. I'll also
> post my loaded modules here:
> 
> *****************
> Module                  Size  Used by
> af_packet              22600  2
> ipv6                  256736  15
> pcmcia_core            57868  0
> parport_pc             34880  1
> lp                     10856  0
> parport                41928  2 parport_pc,lp
> binfmt_misc            10504  1
> thermal                12752  0
> fan                     4044  0
> button                  6360  0
> ac                      4876  0
> battery                 9484  0
> aes                    32704  1
> airo                   73560  0
> slamr                 375844  2
> 8250_pci               18112  0
> 8250                   22112  1 8250_pci
> serial_core            23744  1 8250
> usbhid                 33728  0
> uhci_hcd               32976  0
> shpchp                102572  0
> intel_agp              19932  1
> joydev                  9728  0
> ehci_hcd               31876  0
> usbmouse                5824  0
> pciehp                 99756  0
> ppp_deflate             6400  0
> ppp_async              12416  0
> ppp_synctty             9344  0
> ppp_generic            29908  3 ppp_deflate,ppp_async,ppp_synctty
> slhc                    7552  1 ppp_generic
> snd_rtctimer            3280  0
> snd_seq_oss            34752  0
> snd_seq_midi_event      7744  1 snd_seq_oss
> snd_seq                54288  4 snd_seq_oss,snd_seq_midi_event
> non_fatal               2116  0 [permanent]
> cpufreq_powersave       1792  1
> cpufreq_userspace       7384  0
> firmware_class         10304  0
> pci_hotplug            12292  2 shpchp,pciehp
> ide_cd                 43104  0
> cdrom                  40412  1 ide_cd
> ntfs                  125676  0
> rtc                    12856  1 snd_rtctimer
> nvram                   9352  0
> irda                  197632  0
> wacom                  12928  0
> usbcore               114336  7 usbhid,uhci_hcd,ehci_hcd,usbmouse,wacom
> evdev                   9536  2
> speedstep_centrino      7956  0
> freq_table              4356  1 speedstep_centrino
> processor              18544  2 thermal,speedstep_centrino
> snd_intel8x0           35528  0
> snd_pcm_oss            55144  0
> snd_pcm                98888  2 snd_intel8x0,snd_pcm_oss
> snd_timer              25860  3 snd_rtctimer,snd_seq,snd_pcm
> snd_page_alloc         11848  2 snd_intel8x0,snd_pcm
> snd_mpu401_uart         8064  1 snd_intel8x0
> snd_rawmidi            25252  1 snd_mpu401_uart
> snd_seq_device          8264  3 snd_seq_oss,snd_seq,snd_rawmidi
> snd_ac97_codec         70212  1 snd_intel8x0
> snd_mixer_oss          20224  1 snd_pcm_oss
> snd                    55076  12 snd_seq_oss,snd_seq_midi_event,snd_seq,snd_intel8x0,snd_pcm_oss,snd_pcm,snd_timer,snd_mpu401_uart,snd_rawmidi,snd_seq_device,snd_ac97_codec,snd_mixer_oss
> soundcore              10080  1 snd
> e1000                  85892  0
> msr                     2880  0
> cpuid                   2560  0
> unix                   28916  202
> ************************
> 
> Thanks!
> --
> Roman Joost
> www: http://www.romanofski.de
> email: roman@bromeco.com
> 
> 
>