[chuck-users] Urgent shot in the dark -- Audible clicks when spawning shreds when SndBuf reads from disk

Szilveszter Tóth silvestre.toth at gmail.com
Sun Nov 8 09:57:34 EST 2009


if you record the audio from ChucK using a WvOut like this:

dac.chan(0) => Gain g => WvOut w => blackhole;
"tmp.wav" =>  w.wavFilename;

do you hear the click in the resulting tmp.wav? If not, then the problem 
is with reading a file between samples. If yes, then the abrupt sample 
change may play a role, too.

Szilveszter (Hillaby)

Szilveszter Tóth escribió:
> Mike,
> Just some thoughts.
> When you kill the "last shred" that was playing, the audio signal 
> drops to 0 (or to the first sample of the next WAV file), which may 
> cause clicks.
> Also, reading an entire file (or part of it) between two samples may 
> not be feasible, which will not only cause a click, but the realtime 
> timing will also be lost (ChucK will wait for the entire file to be 
> read in.)
> I'd use an Envelope for the first problem and I'd try changing chunk 
> size for the second. (Or maybe pre-read the next file to be played, if 
> it can be determined beforehand.)
> I hope I could help a little
> Szilveszter (Hillaby)
> mike clemow escribió:
>> This is a shot-in-the-dark...
>> At the last minute, the person who was responsible for doing the sound
>> with a Kyma system, couldn't get it to trigger sounds with MIDI (for
>> some reason or another) and I'm stepping up and doing the whole show
>> with pre-recorded material in ChucK.  (I know, I know -- I'm crazy.)
>> It's 9:25am here on the East Coast of the U.S.  We're onstage at 2pm
>> and 8pm.  I have a script that receives OSC messages from a Java
>> program.  The messages contain the string name of a file to play.
>> It's a simple stereo file (I'm already working with a very kludgy way
>> of playing stereo files--loading it twice into two buffers).  But
>> every time I spawn a new thread, the file loads from disk and there's
>> an audible click, or drop in audio.
>> Now, I know that one way around this is to pre-load all the files into
>> SndBuf objects and then trigger them to play using Events.  The only
>> trouble is that there are 73 files for this piece and some of them are
>> pretty large.  I'm afraid of eating all my RAM / bringing everything
>> to a grinding halt.
>> I'm posting my entire script at the end of the email.  If anyone has
>> any thoughts, please send them along.  Otherwise, we'll just deal with
>> the way things are.
>> Best,
>> Mike

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