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