I have a strange bug in some code I'm writing - I'm streaming sound using FMOD, which calls a callback function where the user can write their sample data. (See my callback function below). I had it working, then tried to make some improvements and the sound became broken/choppy - weird thing is I can get rid of the problem by removing a for/next that iterates through a list from the function. The loop causes a problem even if it contains no code or there are no elements in the list. Can anyone shed any light on this?
Function FMOD_Stream_Callback(stream:Byte Ptr, buff:Byte Ptr, length:Int, userdata:Byte Ptr)
'Print "Hello"
Print "callback!"
Print length
Local snd_ptr:Short Ptr=Short Ptr(buff)
'Print "going to loop"
'1942
'2183
DebugLog CountList(l_tone_list)
DebugLog CountList(r_tone_list)
For n=0 To (length/4)-1
l_sound#=0.0
r_sound#=0.0
rem
For l_tone:toneinfo=EachIn l_tone_list
l_sound:+l_tone.amp*Sin(l_tone.phase)
l_tone.phase:+l_tone.dphase
DebugLog l_tone.phase
Next
endrem
'Comment this for/next out and the jitters disappear!
For r_tone:toneinfo=EachIn r_tone_list
r_sound:+r_tone.amp*Sin(r_tone.phase)
r_tone.phase:+r_tone.dphase
Next
'......
l_sound=32767.0*Sin(Float(sample))
r_sound=0.0
sample:+1
snd_ptr[0]=makesignedshort(l_sound) 'Left speaker
snd_ptr[1]=makesignedshort(r_sound) 'Right speaker
snd_ptr:+2
Next
Return 1
End Function
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