Subject:Peak level of .wav file

Posted by: bejj

Date:10/21/2012 1:29:16 PM

Hi,

Do you know a function that computes the peak level (ex: -3dB) of a wav file ?
(in a script )

Thanks a lot in advance,

Subject:RE: Peak level of .wav file

Reply by: bejj

Date:10/21/2012 1:36:01 PM

I've found the function "ISfFileHost.FindAudioPeak", but it returns the position of peak, and not the value. Any idea for the dB value of peak ?

Subject:RE: Peak level of .wav file

Reply by: bejj

Date:10/21/2012 4:15:48 PM

I've found a solution.
This scripts prints the dB peak level of all .wav in each subfolder of "D:\TEMP".



using System;
using System.IO;
using System.Windows.Forms;
using SoundForge;

public class EntryPoint {
public string Begin(IScriptableApp app)
{
string[] dirHolder = Directory.GetDirectories(@"D:\TEMP");

for (int d = 0; d < dirHolder.Length ; d++)
{
string[] fileHolder = Directory.GetFiles(dirHolder[d], "*.wav");

double maxpeak = -1000;

for (int x = 0; x < fileHolder.Length ; x++)
{
ISfFileHost file = app.OpenFile(fileHolder[x], false, true);
Int64 peakpos = file.FindAudioPeak(new SfAudioSelection(0, file.Length));
double peak = Math.Max(Math.Abs(file.GetSample(peakpos,0)),Math.Abs(file.GetSample(peakpos,1)));
maxpeak=Math.Max(maxpeak, 20 * Math.Log(peak,10));
file.Close(CloseOptions.DiscardChanges);
}

DPF("PeakValue {0,20} dB : {1}", maxpeak,dirHolder[d]);
}
return null;
}

public void FromSoundForge(IScriptableApp app)
{
ForgeApp = app; //execution begins here
app.SetStatusText(String.Format("Script '{0}' is running.", Script.Name));
string msg = Begin(app);
app.SetStatusText(msg != null ? msg : String.Format("Script '{0}' is done.", Script.Name));
}
public static IScriptableApp ForgeApp = null;
public static void DPF(string sz) { ForgeApp.OutputText(sz); }
public static void DPF(string fmt, params object[] args) { ForgeApp.OutputText(String.Format(fmt, args)); }
public static string GETARG(string key, string str) { string val = Script.Args.ValueOf(key); if (val == null) val = str; return val; }
} //EntryPoint