Jaroslav,
Have tried the script. With given sample a speaker cone moves from a listener rather
toward one. As 0x12345600 hasn't 0x80000000 bit set, I suggest a cone must move toward
a listener. Well, to avoid any mysticism I simply measured DAC output with multimeter :-)
The output is negative, of course.
Andrew
======= On Thursday 05 October 2006 16:32, you wrote: =======
On Thu, 5 Oct 2006, Andrew Gaydenko wrote:
> Jaroslav,
>
> I use (with JACK) 'hw:0,0' for analog output and 'hw:0,1' for SPDIF one.
Could you try a more "lowlevel" tool like aplay with a raw file?
You may try the python script bellow (modify values as you want to measure
level for different samples). Note that hw: devices are signed for
ICE1724, so zero is in the middle of range, minimum value is 0x80000000
and maximum 0x7fffff00.
import struct
import os
FILE="file.raw"
SAMPLE=0x12345600
FORMAT="S32_LE"
fp = open(FILE, "w+")
x = struct.pack("I", SAMPLE)
for i in range(0, 100000):
fp.write(x)
fp.close()
os.system("aplay -D hw:0,0 -f %s -c 2 -r 48000 %s" % (FORMAT, FILE))
os.remove(FILE)
Jaroslav
-----
Jaroslav Kysela <perex@xxxxxxxx>
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