Sound: Difference between revisions
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Sound on UNIX has improved tremendously over the last ten years. Especially for Free UNIXes. | Sound on UNIX has improved tremendously over the last ten years. Especially for Free UNIXes. | ||
=== Sound in OpenBSD === | |||
In OpenBSD the interface to the sound card are ''/dev/sound'', ''/dev/audio'', ''/dev/audioctl'', ''/dev/mixer''. | In OpenBSD the interface to the sound card are ''/dev/sound'', ''/dev/audio'', ''/dev/audioctl'', ''/dev/mixer''. | ||
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sox -r 48000 -w -s -c 2 blah.raw blah.wav | sox -r 48000 -w -s -c 2 blah.raw blah.wav | ||
=== Sound in other UBOs === | |||
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Latest revision as of 00:59, 23 October 2006
Sound on UNIX has improved tremendously over the last ten years. Especially for Free UNIXes.
Sound in OpenBSD
In OpenBSD the interface to the sound card are /dev/sound, /dev/audio, /dev/audioctl, /dev/mixer.
Manipulating these are done with the audioctl and mixerctl commands. At kernel configuration time the dmesg may look like this with the auich(4) card.
auich0 at pci0 dev 6 function 0 "NVIDIA nForce3 250 AC97" rev 0xa1: irq 11, nForce3 AC97 audio0 at auich0 auich0: measured ac97 link rate at 47995 Hz, will use 48000 Hz
Playing mp3's can be done with mpg123 or mplayer, with mplayer I usually use the -srate 48000 option to resample the rate to the hardfixed 48000 Hz of this particular card.
Recording is done the following way:
(audioctl record.encoding=slinear_le record.channels=2 \ record.precision=16 ; \ cat /dev/sound ) > blah.raw
This writes a raw file of PCM data but without the headers, I found that sox can attach a header, like so:
sox -r 48000 -w -s -c 2 blah.raw blah.wav
Sound in other UBOs
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