Intermittent Errors trying to read current volume of an audio clip - using clip.GetData

Hi
I'm using the C# script shown below to get the current volume level of an audio sample. I'm then using the varying sample values to control a crude lipsync system.

It works fine except that every so often I get this error in the console:

C:\buildslave\unity\build\Modules/Audio/Public/sound/SoundManager.cpp(702) : Error executing result = instance->m_Sound->lock(offsetBytes, lengthBytes, &ptr1, &ptr2, &len1, &len2) (An invalid parameter was passed to this function. )
UnityEngine.AudioClip:GetData(Single[], Int32)

Its related to the line: - PMaudioSource.clip.GetData

I have tried trapping the error using try/catch but it doesnt work.

Anyone know what could be causing this or have a better solution to getting the audio volume level samples?

Many thanks!
Alan
==================================================

This is the code that generates the errors

Code (CSharp):

1. void GetAudioVolume()
2.     {
3.         if (PMaudioSource!=null && PMaudioSource.clip !=null)
4.         {
5.             currentUpdateTime += Time.deltaTime;
6.             if (currentUpdateTime >= updateStep)
7.             {
8.                 currentUpdateTime = 0f;
9.                 try
10.                 {
11.                     PMaudioSource.clip.GetData(clipSampleData, PMaudioSource.timeSamples); //I read 1024 samples, which is about 80 ms on a 44khz stereo clip, beginning at the current sample position of the clip.
12.  
13.                 }
14.                 catch
15.                 {
16.  
17.                 }
18.  
19.  
20.                 clipLoudness = 0f;
21.                 foreach (var sample in clipSampleData)
22.                 {
23.                     clipLoudness += Mathf.Abs(sample);
24.                 }
25.                 clipLoudness /= sampleDataLength; //clipLoudness is what you are looking for
26.                 clipLoudness *= AmplifyRatio;
27.             }
28.         }
29.  
30.     }

 

This is one that works pretty nicely to give you info about what's playing:

https://docs.unity3d.com/ScriptReference/AudioListener.GetSpectrumData.html

 

Cheers Kurt, also looking at this

Code (CSharp):

1. GetComponent<AudioSource>().GetOutputData(_samples, 0); // fill array with samples
2.          int i;
3.          float sum = 0;
4.          for (i = 0; i < QSamples; i++)
5.          {
6.              sum += _samples[i] * _samples[i]; // sum squared samples
7.          }
8.          RmsValue = Mathf.Sqrt(sum / QSamples); // rms = square root of average
9.          DbValue = 20 * Mathf.Log10(RmsValue / RefValue); // calculate dB
10.          if (DbValue < -160) DbValue = -160; // clamp it to -160dB min
11.                                              // get sound spectrum

 

I resolved by the following, with less samples also.

Code (CSharp):

1. clipLoudness = GetAveragedVolume() * 2.5f;
2.  
3.                 float GetAveragedVolume()
4.                 {
5.                     float[] data = new float[256];
6.                     float a = 0;
7.                     PMaudioSource.GetOutputData(data, 0);
8.                     foreach (float s in data)
9.                     {
10.                         a += Mathf.Abs(s);
11.                     }
12.                     return a / 256;
13.                 }