private int GetSilenceTime(AudioFileReader fileReader, SilenceLocation location, sbyte silenceThreshold = -20)
{
float[] buffer = new float[fileReader.WaveFormat.SampleRate * 4];
int result = 0;
bool volumeFound = false;
bool eof = false;
long oldPosition = fileReader.Position;
while (!volumeFound && !eof)
{
int samplesRead = fileReader.Read(buffer, 0, buffer.Length);
if (samplesRead == 0)
{
eof = true;
}
for (int i = 0; i < samplesRead; i++)
{
if (!IsSilence(buffer[i], silenceThreshold))
{
result = (int)fileReader.Position - (samplesRead - i) * 4;
if (location == SilenceLocation.Start)
{
volumeFound = true;
break;
}
}
}
}
fileReader.Position = oldPosition;
return(result);
}
public static TimeSpan GetSilenceDuration(AudioFileReader reader,
SilenceLocation location,
sbyte silenceThreshold = -20)
{
int counter = 0;
bool volumeFound = false;
bool eof = false;
long oldPosition = reader.Position;
var buffer = new float[reader.WaveFormat.SampleRate * 4];
while (!volumeFound && !eof)
{
int samplesRead = reader.Read(buffer, 0, buffer.Length);
if (samplesRead == 0)
{
eof = true;
}
for (int n = 0; n < samplesRead; n++)
{
if (IsSilence(buffer[n], silenceThreshold))
{
counter++;
}
else
{
if (location == SilenceLocation.Start)
{
volumeFound = true;
break;
}
else if (location == SilenceLocation.End)
{
counter = 0;
}
}
}
}
// reset position
reader.Position = oldPosition;
double silenceSamples = (double)counter / reader.WaveFormat.Channels;
double silenceDuration = (silenceSamples / reader.WaveFormat.SampleRate) * 1000;
return(TimeSpan.FromMilliseconds(silenceDuration));
}
