[Etoys] Sound Recording on Mac

Kim Rose kim.rose at squeakland.org
Thu Nov 9 10:35:05 EST 2006

I just tested on my Mac and can confirm the same results as what 
Scott described.

At 6:00 PM -0800 11/8/06, Yoshiki Ohshima wrote:
>   Hello,
>   Has anybody tried sound recording and playback on Mac lately?  Scott
>reported that it is broken in Squeak 3.9 7067 (and OLPC etoys image)
>on 3.8.12beta4U.app VM.  What happens is that if you record your voice
>with a SoundRecorderMorph or EventRecorderMorph (with the voiceControl
>enabled) and play the recorded sound back, you get incorrect sound.
>   Here is what Scott described:
>(a)  The sound-in-event-recorder bug *does* occur [in 3.9 7067]. 
>But it's slightly 
>different:  although the speed of playback is nearly doubled, as in 
>OLPC, the *pitch* does not change.  So it is not a Donald Duck sound.
>(b)  Also, the same bug now (i.e. in 3.9) also occurs in the vanilla 
>SoundRecorderMorph!  (In the OLPC/Mac image, the vanilla 
>SoundRecorderMorph produces good playback on the Mac -- it's only the 
>use of sound within an EventRecorderMorph that's problematical.  In 
>the 3.9/Mac image *every* SoundRecorderMorph use has this problem.  
>But again, the overly-fast playback occurs *without* a pitch rise.)
>So evidently 3.9 went "final" with the SoundRecorder completely 
>broken on the Mac.
>   Can anybody confirm this?  Since the same code works on Windows (and
>presumably on Linux), we kind of suspected a bug in the Mac VM causes
>the 'stereo' value or sampling rate set incorrectly...  Does anybody
>has an idea?
>-- Yoshiki
>Etoys mailing list
>Etoys at laptop.org

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