Baslinux mailing list

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On Fri, 23 Mar 2007 baslinux AT lists.ibiblio.org wrote:

> Sindi wrote:
> > aumix does not have a 'recording source' line.
>
> According to the man page, switching the source is accomplished by
> using the arrow keys to switch to the desired input source (Line) and
> then turn up the volume as with any of the other controls. On some
> cards, it may be necessary to press the Spacebar to activate Line.
>
> > Would it be 'Line' or 'Line1' or 'Mic'?
>
> Line should be connected to the LINE IN port. Line1 is something else
> - if this is a SB-type card, it refers to some "line in" pins on the
> card itself, next to the CD audio-in pins.
>
> > Mic is currently set to 0, as is Igain.
>
> Igain is for adjustments for weak microphones, I think.

Aumix might not be needed because sox can adjust volume.

> > Please give the details of how to record with sox or aumix, from an
> > audio receiver to line in.
>
> Basic operation:
>
> sox -t ossdsp /dev/dsp outputfile.wav
>
> You can use the standard sox flags to change the output format:
>
> sox -t ossdsp -w -r 44100 -c 2 /dev/dsp cdout.wav
>
> (records at CD quality)
>
> David

Thanks.    The man page was not entirely understandable.

-t ossdsp   file type is ossdsp for use with /dev/dsp and OSS
-w          16-bit word  - how would we do 8-bit for SBPro?
-r 44100    rate 44100 Hertz
-c 2        channels 2 (stereo)  - or 1 for mono

They also suggest:

-s          signed linear sample data.  Is this default?
-v volume  .9 is less, 1.1 is more than default (1.0).

Play is a script for using sox, so uses the same options.

play -V filename.wav says a wav file is 11025 byte/sec, 1 channel, 
Microsoft PCM.  (8-bit mono - 16-bit stereo would be 44100).  Can it be 
played on an i810 chip (only works at 48KHz) with play and some option(s)?

play -c 1 -r 11025 *.wav sounds normal.  SB sound card.

I can also play at half-speed (lower pitch)  -r 5500, or faster -r 22050, 
or louder -v 2.

Sindi