public static decimal GetLoudness(string fileName, Action <double, double> updateProgress = null)
{
if (Path.GetExtension(fileName) != ".wav")
{
return(defaultLoadness);
}
try {
WavReader wavReader;
using (FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
wavReader = new WavReader(fileStream, Encoding.Default);
}
WavReader.FmtChunk fmt = (WavReader.FmtChunk)wavReader.Riff.Chunks["fmt "];
double[][] buffer = wavReader.GetSampleData();
R128LufsMeter r128LufsMeter = new R128LufsMeter();
r128LufsMeter.Prepare(fmt.SampleRate, buffer.Length);
r128LufsMeter.StartIntegrated();
r128LufsMeter.ProcessBuffer(buffer,
(double current, double total) => { updateProgress?.Invoke(current, total); });
r128LufsMeter.StopIntegrated();
// Report input loudness
return(-16 - Convert.ToDecimal(r128LufsMeter.IntegratedLoudness));
}
catch (Exception ex) {
return(defaultLoadness);
}
}
private double Loudness(byte[] pcmData)
{
List <double> data = new List <double>();
for (int i = 0; i < pcmData.Length; i += 2)
{
data.Add((double)BitConverter.ToInt16(pcmData, i) / (short.MaxValue + 1));
}
R128LufsMeter r128LufsMeter = new R128LufsMeter();
r128LufsMeter.Prepare(AudioSampleRate, 1);
r128LufsMeter.StartIntegrated();
r128LufsMeter.ProcessBuffer(new double[][] { data.ToArray() }, null);
r128LufsMeter.StopIntegrated();
double loudness = r128LufsMeter.IntegratedLoudness;
if (double.IsNaN(loudness))
{
return(0);
}
if (loudness <= -70.0)
{
return(0);
}
if (loudness >= 0.0)
{
return(100.0);
}
return((loudness + 70.0) * LUFSToPercent);
}
/// <summary>
/// Normalize a buffer
/// </summary>
/// <param name="buffer">The buffer need to be normalize</param>
/// <param name="sampleRate">The sample rate of the sample data</param>
/// <returns>Normalized buffer</returns>
public static double[][] Normalize(double[][] buffer, double sampleRate)
{
// Calc input loudness
R128LufsMeter r128LufsMeter = new R128LufsMeter();
r128LufsMeter.Prepare(sampleRate, buffer.Length);
Console.Write("Calculating input loudness...");
r128LufsMeter.StartIntegrated();
r128LufsMeter.ProcessBuffer(buffer,
(double current, double total) => { AppendConsoleProgressBar($"Calculating input loudness : {current:N0}/{total:N0}", (double)current / total); });
r128LufsMeter.StopIntegrated();
// Report input loudness
double integratedLoudness = r128LufsMeter.IntegratedLoudness;
ConsoleClearLine();
Console.WriteLine("Input integrated loudness : {0:N} LU", integratedLoudness);
// Normalization to -23 LU
double targetLoudness = TargetIntegratedLufs;
double gain = targetLoudness - integratedLoudness;
int count = 0;
double[][] clone = null;
while (Math.Abs(targetLoudness - integratedLoudness) > 0.5)
{
count++;
// Clone buffer
clone = new double[buffer.Length][];
for (int i = 0; i < buffer.Length; i++)
{
clone[i] = (double[])buffer[i].Clone();
}
// Apply gain to normalize
Console.Write("Applying gain...");
Gain.ApplyGain(clone, gain);
ConsoleClearLine();
Console.WriteLine($"Gain applyed : {gain:N} dB");
// Limit the True Peak
StreamWriter streamWriter = new StreamWriter("limiter.csv");
int c = 0;
TruePeakLimiter.ProcessBuffer(clone, MaximumTruePeak, sampleRate, LimiterAttack, LimiterRelease, LimiterAttackCurve, LimiterReleaseCurve,
(double current, double total) => { if (current % 10000 == 0)
{
AppendConsoleProgressBar($"Limiting : {current:N0}/{total:N0}", (double)current / total);
}
});
ConsoleClearLine();
Console.WriteLine("Limiting finished!");
streamWriter.Close();
// Calc output loudness
Console.Write("Verifying output loudness...");
r128LufsMeter.StartIntegrated();
r128LufsMeter.ProcessBuffer(clone,
(double current, double total) => { AppendConsoleProgressBar($"Verifying output loudness : {current:N0}/{total:N0}", (double)current / total); });
r128LufsMeter.StopIntegrated();
// Report output loudness
integratedLoudness = r128LufsMeter.IntegratedLoudness;
ConsoleClearLine();
Console.WriteLine("Output integrated loudness {0} : {1:N} LU", count, integratedLoudness);
gain += targetLoudness - integratedLoudness;
if (!LoopVerify)
{
break;
}
}
if (clone != null)
{
return(clone);
}
return(buffer);
}