Naudio“TrimWavFile”功能没有正确修剪wav [英] Naudio “TrimWavFile” function is not trimming wav correctly

问题描述

我被困在试图修剪wav文件。我的问题是，当我将文件（32 kbps比特率）修剪为10秒剪辑时，它会将其修剪为00:01:18。完整的原始时间是1:37:13。



我已经尝试指定CutFromStart（00：0：0：0）的值并给出CutFromEnd（00： 1:37:03），但如上所述，产生的音频是01:18，因为我预计它将返回前10秒的wav剪辑...请帮助。



这是我正在使用的代码：

I am stuck in trying to trim a wav file. My problem is that when I trim the file (of 32 kbps bit rate) to a 10-second clip, it is trimming it into 00:01:18. The full, original time is 1:37:13.

I have tried specifying value of CutFromStart ( 00 : 0 : 0 : 0 ) and giving CutFromEnd (00:1:37:03), but as stated, the resulting audio is 01:18 where as i was expecting that it would return first 10 seconds of wav clip... Please help.

This is the code I am using:

public static void TrimWavFile(string input, string output, TimeSpan start, TimeSpan end)
 {
 using (WaveFileReader reader = new WaveFileReader(input))
 {
   using (WaveFileWriter writer = new WaveFileWriter(output, reader.WaveFormat))
            {
                int segement = reader.WaveFormat.AverageBytesPerSecond / 1000;
                Console.WriteLine(""+segement);

                int startPosition = (int)start.TotalMilliseconds * segement;

                startPosition = startPosition - startPosition % reader.WaveFormat.BlockAlign;

                int endBytes = (int)end.TotalMilliseconds * segement;
                endBytes = endBytes - endBytes % reader.WaveFormat.BlockAlign;
                int endPosition = (int)reader.Length - endBytes;


                TrimWavFile(reader, writer, startPosition, endPosition);
            }
        }
    }

private static void TrimWavFile(WaveFileReader reader, WaveFileWriter writer, int startPosition, int endPosition)
{
   reader.Position = startPosition;
   byte[] buffer = new byte[1024];
   while (reader.Position < endPosition)
   {
      int segment = (int)(endPosition - reader.Position);
      if (segment > 0)
      {
          int bytesToRead = Math.Min(segment, buffer.Length);
          int bytesRead = reader.Read(buffer, 0, bytesToRead);
          if (bytesRead > 0)
          {
                writer.WriteData(buffer, 0, bytesRead);
          }
      }
   }
 }

不必要代码块已删除

unnecesary code block removed

推荐答案

只需看看这一行：

Just look at this line:

int endPosition = (int)reader.Length - endBytes;

在此计算文件结束前 TimeSpan end 的位置 - 而不是在文件开头之后。

Here you calculate the position of TimeSpan end before the end of the file - not after the beginning of the file.

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