Re: [chuck-users] WvOut sample size (????????? ????????)

24 Jan 2015

      It's likely just overloading and clipping on the output file.  WvOut
and WvOut2 must quantize to 16 bits to write out the file.  So 
numbers that are greater than +/- 1.0 will overload.  If this is
really the problem (likely), then there's an easy fix.  There's a
method called fileGain() that sets an extra gain before the file
is written out.  The default is of course 1.0, but you can change
it to anything.  Example useage:

MyPatch => WvOut bob => blackhole;
"mywavfile.wav" => bob.wavFilename;

0.5 => bob.fileGain;       // This is your friend for writing non-clipped files

while (now < then)  {
    // do whatever;
}

bob.closeFile();

Hope this helps.  If not let us know and we'll dig deeper.

PRC
...
On Jan 24, 2015, at 9:00 AM, chuck-users-request@lists.cs.princeton.edu wrote:
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1. WvOut  sample size (????????? ????????)
----------------------------------------------------------------------
Message: 1
Date: Fri, 23 Jan 2015 20:22:21 +0100
From: ????????? ???????? 	
To: chuck-users@lists.cs.princeton.edu
Subject: [chuck-users] WvOut  sample size
Message-ID: <54C29F6D.8070701@kviziracija.net>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello,
I am a new member of this list.
I have made some ChucK program that sounds good when performed by ChucK 
VM. However, when I record this music through WvOut in to file and later 
play recorded file using system player, I hear some cracks (distortions, 
noise).
It seems to me that it is some conversion taking place during recording. 
In  the documentation of WvOut class it is suggested that MATLAB file 
format will write 64-bit floats. But even with that precision I get the 
same sound in file. I have looked in to the source code and found that 
every method of WvOut class (WvOut_ctrl_<filetype>Filename) opens file 
with the same 16-bit sample-size (Stk::STK_SINT16).
I have tried naively to change that parameter into Stk::STK_SINT32, and 
recompiled successfully ChucK, but the quality of recorded sound was not 
improved. Actually, file was again 16-bit signed encoded.
What can I do to improve quality of recording.
My computer is amd-64 Ubuntu 14.04. I have compiled ChucK with 'make 
linux-alsa' command.
PS: I tried to record sound from system sound-card by using some other 
programs for recording, but with no success. Either ChucK could not 
access sound-card or a recording program could not access sound-card. It 
seems that ChucK insists on having exclusive rights over sound-card and 
doesn't want to share it with other programs. Even if in my browser is 
opened some site that uses sound, ChucK refuses to start.
Vitalije
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Re: [chuck-users] WvOut sample size (????????? ????????)

Perry Cook