使用 NAudio 分割 Wav 文件会从每个部分中删除 1 秒

Question

我正在使用 NAudio 将 Wav 文件分割成多个等间隔的部分。我正在使用 Mark Heath 的 Sound Code 上提供的代码版本：

public static void TrimWavFile(string inPath, string outPath, TimeSpan cutFromStart, TimeSpan cutFromEnd)
{
    using (WaveFileReader reader = new WaveFileReader(inPath))
    {
        using (WaveFileWriter writer = new WaveFileWriter(outPath, reader.WaveFormat))
        {
            //int bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000;
            float bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000f;
            int startPos = (int)cutFromStart.TotalMilliseconds * (int)bytesPerMillisecond;
            startPos = startPos - startPos % reader.WaveFormat.BlockAlign;

            int endBytes = (int)cutFromEnd.TotalMilliseconds * (int)bytesPerMillisecond;
            endBytes = endBytes - endBytes % reader.WaveFormat.BlockAlign;
            int endPos = (int)reader.Length - endBytes;

            TrimWavFile(reader, writer, startPos, endPos);
        }
    }
}

private static void TrimWavFile(WaveFileReader reader, WaveFileWriter writer, int startPos, int endPos)
{
    reader.Position = startPos;
    byte[] buffer = new byte[reader.WaveFormat.BlockAlign * 100];
    while (reader.Position < endPos)
    {
        int bytesRequired = (int)(endPos - reader.Position);
        if (bytesRequired > 0)
        {
            int bytesToRead = Math.Min(bytesRequired, buffer.Length);
            int bytesRead = reader.Read(buffer, 0, bytesToRead);
            if (bytesRead > 0)
            {
                writer.Write(buffer, 0, bytesRead);
            }
        }
    }
}

这是分割 Wav 文件，但每个部分比指定的间隔短 1 秒。我不知道这是代码还是库本身的问题。有人遇到过同样的问题吗？如果是的话，有人能解决吗？

编辑 这是我发送给函数的内容：

TimeSpan cutFromStart = new TimeSpan(0, 0, 0);
TimeSpan cutFromEnd = new TimeSpan(0, 0, 0);
cutFromEnd = totalTime.Subtract(interval);

for (i = 0; i < numberOfParts; i++)
{
    outPath = inpath + prefix + (i + 1).ToString() + ".wav";
    TrimWavFile(inPath, outPath, cutFromStart, cutFromEnd);
    cutFromStart = cutFromStart.Add(interval);
    cutFromEnd = cutFromEnd.Subtract(interval);
}

Answer 1

我怀疑你的位置计算有错误。

但也许你会发现使用这种技术更容易

using (var reader = new AudioFileReader(inPath))
{
    reader.CurrentTime = startTime; // jump forward to the position we want to start from
    WaveFileWriter.CreateWaveFile16(outPath, reader.Take(duration));
}