cspctl(1)cspctl(1)NAMEcspctl - Sound Blaster 16 ASP/CSP control program
SYNOPSIScspctl command [-options] <filename>
DESCRIPTIONcspctl is a simple CSP microcode loader for Crative Sound Blaster 16ASP
and some Sound Blaster AWE32 sound cards with Creative Signal Processor
(CSP) chip (CT1748A) installed. cspctl can also be used as a post-
install function to snd-sb16-csp module to load default codec at module
installation. If CSP chip is succesfully detected and initialized, it
will be installed as a hardware dependant device hwC0D2 into /dev/snd
directory. Currently, following codecs can be loaded to CSP device:
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
These codecs are not yet supported by ALSA:
wfm0201a.csp Text2Speech decoder
Qsound microcode file has four functions, each function is a decoder
for different sample rate. Rates for QSound functions #1, #2, #3 and #4
are 44100, 22050, 11025 and 8000Hz respectively. IMA ADPCM and Fast‐
Speech codecs are formed of two functions, the first one is for capture
and the second one is for playback. A-law and u-law codecs have only
one function. To load for example function #2 from QSound microcode
file (decoder for 22050Hz), run as follows:
% cspctl load -f 2 -d QSound wfm0001a.csp
After successful loading, /proc/asound/SB16/cspD2 will show:
Creative Signal Processor [v1.0]
State: -x--L
Codec: QSound [func #2]
Sample rates: 22050Hz
QSound decoder disabled
With QSound decoder microcode loaded, all simple PCM file formats can
be played with QSound 180 degree positioning applied. QSound element is
dynamically added into mixer structure as 3DEffect1-space element. It
will only show if support for CSP has been compiled into ALSA drivers,
CSP chip has been found, and QSound codec is loaded into CSP. When
enabled, QSound position can be dynamically changed by mixer slider,
and proc interface should follow the state of CSP chip and its current
QSound position:
Creative Signal Processor [v1.0]
State: Qx-RL
Codec: QSound [func #2]
Sample rates: 22050Hz
QSound decoder enabled
Processing 16bit mono PCM samples
Qsound position: left = 0x9, right = 0x9
Driver supports autoloading of u-Law, A-Law and Ima-ADPCM hardware
codecs. Autoloading is active only when there is no microcode loaded to
CSP, and there is no need to preload appropriate *.csp files. To unload
manually loaded microcode, you should run
% cspctl unload
If hardware codec microcode has been manually loaded, then CSP will
support only loaded PCM format and autoloading will be disabled. In
such case, proc interface will show loaded codec properties:
Creative Signal Processor [v1.0]
State: -x--L
Codec: IMA-ADPCM [func #2]
Sample rates: All
PCM format ID: 0x400000 (16bit/-) [mono/stereo] [playback/-]
COMMANDS
load Load microcode from filename to CSP.
unload Unload microcode from CSP.
OPTIONS-h, --help
Display a short help.
-c card
Select a card number. Option defaults to 0.
-f function
Select a function from microcode file. Option defaults to 1.
-d description
Optional microcode description string.
AUTHOR
Uros Bizjak <uros@kss-loka.si>.
April 27, 2000 cspctl(1)
