Re: [Alsa-user] play 2 sounds at the same time

[Georgi Georgiev]

Quentin Saderne wrote:

Do you mean that a simple /etc/init.d/alsa start doesn't make your card
usable?

no, the script is loaded at boot time, but it doesn t work. so i added a
restart in a script at the end of the boot and it works...

Can't help you here. Infinite possibilites for a problem with your configuration. Try debugging the script by hand, see what so different happens when you "restart" that did not happen when you "start" the script. Maybe it doesn't load your modules properly or it could be about anything....

2) i wonder if i could play 2 sounds at the same time without using a
sound server a friend that uses alsa too can play 2 sounds at the
same time, but i can't is there anything to change or to add in the
config files ?

It's all up to your card I think. Creative Live cards can do it for
what I know. I don't know about others.

it works with windows i can play a mp3 and a movie at the same time and i
hear the 2 sounds so my card must be able to do it, or a software mix
the 2 sound before, i don't know what is the procedure to follow to make
alsa play 2 sounds at the same time ?

What makes you think that the windows drivers don't do something
similar to what the sound server does?

i don t know what the windows driver is doing but i have a friend that
uses alsa. he needs to restart it at boot time too, but he can play 2 diffrent sounds at the same time.

>

What kind of sounds card do you have anyway?

i don t know exactly it s a chipset directly on the motherboard ac_97 i
think, or something like that

Does your friend have the same card and can he play a sound at the same time by using direct alsa output? I doubt it. As I said (and I doubt I am talking nonsense) it is all up to the card. I for example have a Creative Live and an onboard cmedia cards. The creative can play up to 32 sounds simultaneously, but the cmedia cannot. It has nothing to do with configurations or anything... as far as I know. The card either supports it or not. You can see how many simultaneous "open"s each device you have supports by doing a quick

# cat /proc/asound/pcm

It should say for each device you have - device id, driver, playback and or capture subdevices (number of simultaneous opens). Mine looks like this, and as you can see the on-board C-Media can only play one sound at a time.

00-00: emu10k1 : EMU10K1 : playback 32 : capture 1
00-01: emu10k1 mic : EMU10K1 MIC : capture 1
00-02: emu10k1 efx : EMU10K1 EFX : capture 1
00-03: emu10k1 : EMU10K1 FX8010 : playback 8
01-00: CMI8738-MC6 : C-Media PCI DAC/ADC : playback 1 : capture 1
01-01: CMI8738-MC6 : C-Media PCI 2nd DAC : playback 1
01-02: CMI8738-MC6 : C-Media PCI IEC958 : playback 1 : capture 1

Check your friend's /proc/asound/pcm and compare.

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