[MacRuby-devel] [MacRuby] #733: Proc as callback function for CoreAudio(AudioDeviceCreateIOProcID) isn't called

[MacRuby]

#733: Proc as callback function for CoreAudio(AudioDeviceCreateIOProcID) isn't
called
-----------------------------------+----------------------------------------
 Reporter:  nagachika00@…          |       Owner:  lsansonetti@…        
     Type:  defect                 |      Status:  new                  
 Priority:  blocker                |   Milestone:                       
Component:  MacRuby                |    Keywords:                       
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 I'm trying to output arbitrary waveform data to audio device with
 CoreAudio Framework, and confront a callback function problem. I attach
 sample scripts.

 At first, I have to apply a small dirty patch to MacRuby to avoid
 {{{"unrecognized runtime type `?'"}}} exception. The function
 AudioDeviceStart/Stop take an argument has type `"^?"`, but MacRuby
 doesn't allow that type. I attach the patch too.

 In my sample, register Proc as callback function with
 AudioDeviceCreateIOProcID() seems success. Then call AudioDeviceStart() to
 start playback, but the Proc object seems never called.
 The sample script intends play silent waveform, so make no sound is OK,
 but log message to stdout with Kernel#p method isn't available.

 The callback function in CoreAudio is called from CoreAudio internal
 thread. Is that the cause of the problem?

 {{{
 $ macruby -I. coreaudio_sample.rb
 Default Output Device ID = 268
 #<Pointer:0x2002565a0>
 start
 sleep
 macruby(19434,0x103cc7000) malloc: *** auto malloc[19434]: error: GC
 operation on unregistered thread. Thread registered implicitly. Break on
 auto_zone_thread_registration_error() to debug.

 stop
 }}}

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/733>
MacRuby <http://macruby.org/>