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Get decibels per second of an audio file using

I want to calculate decibels per second of any .wav file using naudio. This is my code:

WaveFileReader reader = new WaveFileReader(@"C:\Users\Admin\Desktop\result.wav");
            int bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000;            
            //byte[] buffer = new byte[reader.Length];
            //int read = reader.Read(buffer, 0, (int)reader.Length);
            TimeSpan time = new TimeSpan(0, 0, 1);

            int bytesPerSecond = (int)time.TotalMilliseconds * bytesPerMillisecond;
            byte[] oneSecondBuffer = new byte[bytesPerSecond];
            int read = reader.Read(oneSecondBuffer, 0, bytesPerSecond);

            short sample16Bit = BitConverter.ToInt16(oneSecondBuffer, 1);
            double volume = Math.Abs(sample16Bit / 32768.0);
            double decibels = 20 * Math.Log10(volume);

This line:

short sample16Bit = BitConverter.ToInt16(oneSecondBuffer, 1);

returns 0. What am I doing wrong?

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1 answer


I solved this problem in a different way. This is a piece of code that might help other people:

var silenceDict = new Dictionary<int, bool>();
            using (NAudio.Wave.AudioFileReader wave = new NAudio.Wave.AudioFileReader(filePath))
            {
                var samplesPerSecond = wave.WaveFormat.SampleRate * wave.WaveFormat.Channels;
                var readBuffer = new float[samplesPerSecond];
                int samplesRead;
                int i = 1;
                do
                {
                    samplesRead = wave.Read(readBuffer, 0, samplesPerSecond);
                    if (samplesRead == 0) break;
                    var max = readBuffer.Take(samplesRead).Max();

                    if ((int)(max * 100) != 0)
                        silenceDict.Add(i, false);
                    else
                        silenceDict.Add(i, true);

                    i++;
                } while (samplesRead > 0);


}

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