c# - Naudio - 将 32 位 wav 转换为 16 位 wav

Question

我一直在尝试将 32 位立体声 wav 转换为 16 位单声道 wav。我使用 naudio 来捕捉声音，我认为只使用四个更重要的字节中的两个就可以了。

这是 DataAvailable 的实现:

void _waveIn_DataAvailable(object sender, WaveInEventArgs e)
{
     byte[] newArray = new byte[e.BytesRecorded / 2];
     short two;
     for (int i = 0, j = 0; i < e.BytesRecorded; i = i + 4, j = j + 2)
     {
          two = (short)BitConverter.ToInt16(e.Buffer, i + 2);


          newArray[j] = (byte)(two & 0xFF);
          newArray[j + 1] = (byte)((two >> 8) & 0xFF);
     }
     //do something with the new array:
}

如有任何帮助，我们将不胜感激!

Answer 1

我终于找到了解决方案。我只需要将转换后的值乘以 32767 并将其转换为 short:

void _waveIn_DataAvailable(object sender, WaveInEventArgs e)
{
    byte[] newArray16Bit = new byte[e.BytesRecorded / 2];
    short two;
    float value;
    for (int i = 0, j = 0; i < e.BytesRecorded; i += 4, j += 2)
    {
        value = (BitConverter.ToSingle(e.Buffer, i));
        two = (short)(value * short.MaxValue);

        newArray16Bit[j] = (byte)(two & 0xFF);
        newArray16Bit[j + 1] = (byte)((two >> 8) & 0xFF);
    }
}