100 lines
3.4 KiB
Text
100 lines
3.4 KiB
Text
|
|
OpenAL setup for general use (Linux)
|
|
-------------------------------------
|
|
As of July 2004 it is best to add at least the following line to your
|
|
~/.fgfsrc file on Linux because it wil find out what audio backend to
|
|
use, starting with the most appropriate:
|
|
|
|
(define devices '(native alsa sdl esd arts null))
|
|
|
|
|
|
|
|
ALSA surround sound (5.1) setup
|
|
-------------------------------------
|
|
(taken from http://floam.ascorbic.com/how-to/alsa5.1)
|
|
|
|
Make a ~/.openalrc, we are telling OpenAL that we want surround sound and
|
|
we want to use ALSA instead of OSS.
|
|
|
|
(define speaker-num 4)
|
|
(define devices '(alsa))
|
|
(define alsa-out-device "surround40:0,0")
|
|
|
|
|
|
|
|
IRIX surround sound (5.1) setup
|
|
-------------------------------------
|
|
To add 4 channel surround sound on IRIX hardware that supports in
|
|
directly you can just add the following line to your ~/.fgfsrc file:
|
|
|
|
(define speaker-num 4)
|
|
|
|
To add 4 channel surround sound to IRIX systems that have more than one
|
|
stereo output you can add the following section to your ~/.fgfsrc file
|
|
(for a typical O2 configuration):
|
|
|
|
(define speaker-num 4)
|
|
(define native-out-device "Analog Out")
|
|
(define native-rear-out-device "Analog Out 2")
|
|
|
|
or alternatively:
|
|
|
|
(define speaker-num 4)
|
|
(define native-out-device "A3.Speaker")
|
|
(define native-rear-out-device "A3.LineOut2")
|
|
|
|
|
|
|
|
(Note the following section is obsolete as of July 2004m since your could
|
|
command OpenAL to use ALSA or Arts directly)
|
|
|
|
ALSA and Arts
|
|
-------------------------------------
|
|
|
|
I'm using kernel 2.6.5 with alsa, my sound module is snd-intel8x0. When I ran
|
|
fgfs, I'd get quite 'choppy' sound (wasn't smooth, there'd be a couple of
|
|
breaks in the sound every second or so). Running arts, and starting fgfs with
|
|
"artsdsp fgfs" (from the artsdsp website: "When an application is run under
|
|
artsdsp all accesses to the /dev/dsp audio device are intercepted and mapped
|
|
into aRts API calls. While the device emulation is not perfect, most
|
|
applications work this way, albeit with some degradation in performance and
|
|
latency.") would improve the situation, but it seemed to still be choppy.
|
|
|
|
This command:
|
|
echo "fgfs 0 0 direct" >/proc/asound/card0/pcm0p/oss
|
|
|
|
(from the alsa kernel OSS emulation website:
|
|
"The direct option is used, as mentioned above, to bypass the automatic
|
|
conversion and useful for MMAP-applications")
|
|
|
|
made my sound work beautifully when fgfs was run with artsdsp. Running without
|
|
artsdsp however (with artsd suspended or killed), would give me no sound at all
|
|
(which I find a bit strange)
|
|
|
|
The following websites might help people with similar troubles:
|
|
http://www.alsa-project.org/~iwai/OSS-Emulation.html
|
|
http://www.arts-project.org/doc/handbook/artsdsp.html
|
|
|
|
Computer info:
|
|
|
|
kernel 2.6.5
|
|
|
|
flightgear 0.9.4
|
|
simgear 0.3.5
|
|
plib 1.8.3
|
|
|
|
soundcard is onboard an asus p4p800-e deluxe mobo (using snd-intel8x0), alsa,
|
|
related modules from lsmod:
|
|
Module Size Used by
|
|
snd_pcm_oss 53252 1
|
|
snd_mixer_oss 19968 1 snd_pcm_oss
|
|
snd_intel8x0 33476 1
|
|
snd_ac97_codec 63492 1 snd_intel8x0
|
|
snd_pcm 97408 2 snd_pcm_oss,snd_intel8x0
|
|
snd_timer 26112 1 snd_pcm
|
|
snd_page_alloc 11396 2 snd_intel8x0,snd_pcm
|
|
snd_mpu401_uart 7936 1 snd_intel8x0
|
|
snd_rawmidi 24832 1 snd_mpu401_uart
|
|
snd_seq_device 8324 1 snd_rawmidi
|
|
snd 53892 9 snd_pcm_oss,snd_mixer_oss,snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer,snd_mpu401_uart,snd_rawmidi,snd_seq_device
|
|
soundcore 10208 2 snd
|