Question

我想使用naudio计算任何.wav文件的1秒分贝。这是我的代码：

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);

这一行：

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

返回0.我做错了什么？

Answer 1

我以另一种方式解决了这个问题。这是一段代码，可以帮助其他人：

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);

}

使用naudio获取1秒音频文件的分贝

1 个答案: