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Old 02-07-2020, 11:32 AM   #1
Cedrik0s
Human being with feelings
 
Join Date: Oct 2014
Posts: 62
Default Reascript: GetPeakInfo and GetPeakHoldDB returning dubious values

Using Reascript Python on Windows (but Lua does the same), the 2 functions have a weird behaviour, or at least not the one I'd expect.

Sending a steady signal on a track (be it a tone or a DC), and polling repeatedly the Peak value with GetPeakInfo does not return a constant value as I would expect.

Just try that:
Code:
def Loop():
  tr = RPR_GetTrack(0, 0)
  msg(RPR_Track_GetPeakInfo(tr, 0))
  time.sleep(0.5)
  RPR_defer("Loop()")
    
Loop()
You'll get values like these for an sine at -12dB (so I'd expect peaks at 0.25):
0.25
0.0001699551212368533
0.001268418156541884
0.25
1.0375602869316936e-05
0.001502196304500103
0.0014873228501528502
0.0014873228501528502
0.0017440064111724496
0.0014873228501528502
0.25
0.25
0.25
8.937004167819396e-06
0.25

What are those small values between the 0.25s?


The other function, GetPeakHoldDB is weird too:
If you use this code:
Code:
def Loop():
  tr = RPR_GetTrack(0, 0)
  msg(RPR_Track_GetPeakHoldDB(tr, 0, False))
  RPR_Track_GetPeakHoldDB(tr, 0, True) # clear the peak hold
  time.sleep(0.5)
  RPR_defer("Loop()")
    
Loop()
You get values like these:
-120.0
-0.121
-120.0
-0.121
-0.121
-0.121
-0.121
-0.121
-0.121
-120.0
-0.121
-120.0
-0.121
-120.0
-120.0
-120.0
-0.121
-120.0
-0.121
-120.0

Here the correct value is the -0.121.
The fact that the function has DB in its name but returns cents of DBs seems like a first inconsistency.
The fact that it returns -120 many times doesn't really make sense (that would be -12000dB!!) and this looks like a bug too.
Also by calling RPR_Track_GetPeakHoldDB(tr, 0, True), I would expect it to return the peak value and then clear the hold. Instead it will only return -120, always...

I think both function misbehave (and must be punished).

Thanks.

C

Last edited by Cedrik0s; 02-08-2020 at 08:12 AM. Reason: Make title clearer
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