WorldViz User Forum - Sound doesn't play from director functions

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- - Sound doesn't play from director functions (https://forum.worldviz.com/showthread.php?t=1577)

roman_suvorov

07-26-2008 02:36 PM

Sound doesn't play from director functions

Hello, when running a sample script like this one:

Code:

import viz

viz.go()



def playSound():

        sound = viz.addAudio("quack.wav")

        sound.play()

        return

        

viz.director(playSound)

.. no sound is played and the following error message is displayed:

Code:



** ERROR: Failed to create graph builder (CoInitialize has not been called. )

** ERROR: Failed to load audio 'quack.wav'

However, this works fine:

Code:

import viz

viz.go()

sound = viz.addAudio("quack.wav")

sound.play()

.. so I figured this must have something to do with Vizard's handling of director functions. Any ideas?

farshizzo

07-29-2008 09:59 AM

You need to add the sound object in the main thread. Once it is added you should be able to play it in other director threads.

If it is necessary for you to add the sound object in the director thread, then you can install the pywin32 library for python and use the following code:

Code:

import viz

import pythoncom

viz.go()



def playSound():



        pythoncom.CoInitialize() #Initialize COM



        sound = viz.addAudio("quack.wav")

        sound.play()



        pythoncom.CoUninitialize() #Uninitialize COM



        return

        

viz.director(playSound)

Gladsomebeast

07-29-2008 12:25 PM

If it takes a while to add the sound, would there be a frame rate blip on the add?

What if you added a 3D model with this method?

farshizzo

07-29-2008 02:28 PM

If the audio takes a while to load, then adding the file during runtime will cause a stall in the framerate. In this case, you would use the modified version of the director function I posted above. This is not the case for 3D models though, they can be added as usual in director functions. The call to pythoncom.CoInitialize() is only necessary for COM/DirectX related objects.

roman_suvorov

07-31-2008 08:31 AM

Thanks farshizzo, very helpful as usual. Works flawlessly now. :)

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