NAudio拆分wav文件产生0秒wav文件

Question

我正在使用NAudio将一个完整的专辑分割成几个音频文件。该程序运行流畅，没有异常，但最终，输出的音频文件是不能收听的，它们显示为0秒。

下面是我的代码；albumPath描述存储单个文件的文件夹的路径，filePath是输入文件的路径。

        private void splitWavPrep(string albumPath,string filePath)
    {

        MediaFoundationReader reader = new MediaFoundationReader(filePath);
        int bytesPerMilliSecond = reader.WaveFormat.AverageBytesPerSecond / 1000;
        for (int i = 0; i < tracks.Count; i++)
        {
            string trackName = tracks[i].Name;
            int startMilliSeconds = (int) tracks[i].StartSeconds * 1000;
            int duration;
            if (i< tracks.Count - 1)
            {
                //if there's a next track
                duration = (int)(tracks[i + 1].StartSeconds*1000) - startMilliSeconds;
            }
            else
            {
                //this is the last track
                duration = (int) reader.TotalTime.TotalMilliseconds - startMilliSeconds;
            }
            int startPos = startMilliSeconds * bytesPerMilliSecond;
            startPos = startPos - startPos % reader.WaveFormat.BlockAlign;
            int endMilliSeconds = startMilliSeconds + duration;
            int endBytes = (endMilliSeconds - startMilliSeconds) * bytesPerMilliSecond;
            endBytes = endBytes - endBytes % reader.WaveFormat.BlockAlign;

            int endPos = startPos + endBytes;

            string trackPath = Path.Combine(albumPath, trackName + ".wav");
            splitWav(trackPath, startPos, endPos, reader);

        }
    }

    private async void splitWav(string trackPath, int startPos, int endPos, MediaFoundationReader reader)
    {

        int progress = 0;
        WaveFileWriter writer = new WaveFileWriter(trackPath, reader.WaveFormat); 
        reader.Position = startPos;
        byte[] buffer = new byte[1024];
        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)
                {
                    await writer.WriteAsync(buffer, 0, bytesRead);
                    progress += bytesRead;
                }
            }
        }
    }

我以前从来没有处理过音频文件，我也不知道比特率之类的东西。如果你有什么想法或建议，请告诉我，因为我被困在这里了。

Answer 1

您需要对WAV报头的WaveFileWriter执行Dispose操作才能正确格式化。

更新您的splitWav方法：

using(WaveFileWriter writer = new WaveFileWriter(trackPath, reader.WaveFormat)) 
{
   // your code here
}

此外，您需要使用Write方法而不是WriteAsync方法，因为Write将跟踪写入数据块的字节数