9 Jan
2004
9 Jan
'04
2:11 p.m.
Hi,
I've just switched my system to Kernel 2.6 and installed ALSA. I've
perfectly configured everything...
I've a Sound Blaster 16 with CSP (an ISA card ten or more years old!) that
works very fine. I've modprobed snd-sb16 with the option that rise csp
support.
$ cat /proc/asound/card0/cspD1
Creative Signal Processor [v1.0]
State: -x---
I do not know very well what a CSP, Creative Signal Processor, but I think,
reading at ALSA sources, that it's a chip that speedups some
compressions/decompressions using some audio codecs.
I would like to know how can I actively use this gorgeous more-ten-years-old
chip with some applications. Maybe, I'll save a cople of seconds when I
transform a wav to mp3 (or ogg that's better!)?
Thank you very much!,
Pietro
--
+------------------------------------------------+
| "Pietro" <p.alfa(a)email.it> |
+------------------------------------------------+
10 Jan
10 Jan
7:20 a.m.
[About sb16-dsp...]
I've found the package "alsa-tools" that is not present in Debian ad
compiled cspctl, that allows loading some dsp chip microcodes.
From the man page:
wfm0001a.csp QSound decoder
wfm0006a.csp A-law codec
wfm0007a.csp u-law codec
wfm0011a.csp IMA ADPCM codec (distorted output for IMA test files)
wfm0200a.csp Creative ADPCM codec (sounds like Intel/DVI IMA ADPCM compatible)
wfm0202a.csp Fast Speech 8 codec
wfm0203a.csp Fast Speech 10 codec
I've found these files on the very old sb16 DOS installation disks, so if
someone wants them, mail me.
I've installed QSound decoder and magically appeared a alsamixer control
that allows me to do some 3d-stereo sorceries!
But what about A-law codec and u-law codec? I've tried to load them and use
sox to transform a PCM wave to A-law or u-law wave, but sox does not seem to
use my beloved DSP chip!
I know that a chip mounted on a 10-years-old-ISA-card will not be able to
boost my pc to warp speed, but I would like to have the joy of using in the
2004 a piece of industrial antiquity! Eh eh :)
Regards,
Pietro.
--
+------------------------------------------------+
| "Pietro" <p.alfa(a)email.it> |
+------------------------------------------------+
8:34 a.m.
On Sat, Jan 10, 2004 at 12:16:55PM +0100, Pietro wrote:
But what about A-law codec and u-law codec? I've
tried to load them and use
sox to transform a PCM wave to A-law or u-law wave, but sox does not seem to
use my beloved DSP chip!
AFAIK those are only used for recording/playback of sound. If you load
the microcode for u-law for instance, DSP streams that are recorded will
be compressed with u-law, and you can playback raw u-law streams to the
card. This is speculation based on how the DOS drivers worked. I don't
think the chip can be used as a coprocessor.
--
Ryan Underwood, <nemesis(a)icequake.net>
7670
days inactive
7671
days old
linux-audio-user@lists.linuxaudio.org
2 comments
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Pietro -
Ryan Underwood