Audiodev.xdd
From SpareMiNT Wiki
Here is a (working) /dev/audio for ALL (well, don't know if it works on falcons -- I don't have one to test it on) Ataris running Mint. It supports:
- Yamaha PSG
- arbitrary speed
- 8 bit signed/unsigned/u-law encoded samples
- STe DMA hardware
- 6/12/25/50 kHz
- mono/stereo
- 8 bit signed/unsigned/u-law encoded samples
- volume/balance/bass/treble setting
To install just copy audiodev.xdd to /multitos/ or /mint/ of your boot drive and reboot.
/usr/local/bin/actrl is a utility program that lets you set the various characteristics of the audio device (speed, mono/stereo, sample format, volume, balance, bass, treble) and is a good source to look at if you plan to write programs that use /dev/audio. If you don't have STe compatible sound hardware, only the speed can be set. /usr/local/bin/actrl should go to /usr/local/bin.
[edit] Examples
Set max. volume, linear treble and bass amplification, mono mode (works only on machines that have STe compatible sound hardware):
/usr/local/bin/actrl volume 100 treble 50 bass 50 mono
Play an unsigned sample at 6 kHz:
/usr/local/bin/actrl format u8 speed 6000 cat sample > /dev/audio
Play a sun .au audio file:
/usr/local/bin/actrl format ulaw speed 8000 cat sample.au > /dev/audio
A note on playing SUN .au files on STe DMA hardware: the old style SUN audio files are 8 bit u-law encoded at 8000 Hz. Since the STe audio hardware is only capable of playing at 6kHz or 12kHz (but not 8kHz) SUN .au's are either played too fast or too slow. One solution to this problem is to convert the sample rate to 12kHz using sox:
sox -U -r 8000 sample.au -U -r 12517 sample-at-12k.au
and then playing the file with:
/usr/local/bin/actrl speed 12517 format ulaw cat sample-at-12k.au > /dev/audio
or as a one-liner:
/usr/local/bin/actrl speed 12517 format ulaw sox -U -r 8000 sample.au -U -r 12517 - > /dev/audio
[edit] Additions
- Up to 8 channel MOD's and Screamtracker 3 files can be played using s3mod.
- Both sox and s3mod are NOT part of this distribution.
- This audiodev is based on audiodev 0.1 by C. Briscoe-Smith which in turn is based on lpdev 0.6 by Theirry Bousch. However, what you are holding in your hands is completely rewritten by me, Kay Roemer.
