Fw: full-duplex

llornkcor (llornkcor@llornkcor.com)
Sun, 8 Nov 1998 11:11:11 -0700


This was forwarded from linux-sound

>I have been working with this off and on for some time now and with the
>release of 2.1.126, there seems to be some light at the end of the
>tunnel:
>
>System:
>Alpha 164LX RH 5.1 2.1.126 sound - 82c931
>
>I can now assign two seperate DMAs to the card and play/record without
>overruns.
>
>But I cannot play and record at the same time. It returns a device busy
>warning.
>
>"sox: Can't open output file '/dev/dsp': Device or resource busy"
>
>To record I use:
>[root@Z speak_freely-6.1c]# dd bs=8k count=128 </dev/audio >sample.au
>128+0 records in
>128+0 records out
>
>to play I am using:
>play -t ul -r 8000 sample.au
>
>Although I can record a sample and play it back correctly in
>soundstudio, "dd" results in loud static being recorded. I assume that
>is a format problem so I am not worried about it. But it is the same
>noise I hear when I try to transmit sound over a network via
>speakfreely.
>
>Any thoughts?
>
>/Mike
>
>info below:
>
>
>[root@Z /proc]# m dma
> 0: MAD16 WSS
> 1: MAD16 WSS
> 4: cascade
>
>[root@Z /proc]# m /dev/sndstat
>at Nov 7 14:17:37 EST 1998 alpha
>Config options: 0
>
>Installed drivers:
>
>Card config:
>
>Audio devices:
>0: MAD16 WSS (82C930) (DUPLEX)
>
>Synth devices:
>
>Midi devices:
>0: Mad16/Mozart
>
>Timers:
>0: System clock
>
>Mixers:
>0: MAD16 WSS (82C930)

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