为什么NA​​udio在播放文件后而不是之前读取零来缓冲？

Question

The following code will successfully, load, play, edit audio samples and (almost) write to audio file. I say almost because when I comment out the "Play" code it works, but leaving it in causes the buffer read:

audioFile.Read(buffer, 0, numSamples);

to result in zeros.

Do I need to reset the audioFile somehow? All the examples I've found don't mention any need for this.

using System;
using NAudio.Wave;

namespace NAudioTest
{
class TestPlayer
{
    static void Main(string[] args)
    {
        string infileName = "c:\\temp\\pink.wav";
        string outfileName = "c:\\temp\\pink_out.wav";

        // load the file
        var audioFile = new AudioFileReader(infileName);

        // play the file
        var outputDevice = new WaveOutEvent();
        outputDevice.Init(audioFile);
        outputDevice.Play();
        //Since Play only means "start playing" and isn't blocking, we can wait in a loop until playback finishes....
        while (outputDevice.PlaybackState == PlaybackState.Playing) { System.Threading.Thread.Sleep(1000); }

        // edit the samples in file
        int fs = audioFile.WaveFormat.SampleRate;
        int numSamples = (int)audioFile.Length / sizeof(float); // length is the number of bytes - 4 bytes in a float

        float[] buffer = new float[numSamples];
        audioFile.Read(buffer, 0, numSamples);

        float volume = 0.5f;
        for (int n = 0; n < numSamples; n++) { buffer[n] *= volume; }

        // write edited samples to new file
        var writer = new WaveFileWriter(outfileName,audioFile.WaveFormat);
        writer.WriteSamples(buffer,0,numSamples);
    }
}

}

Answer 1

You must call Dispose on your writer before it is a valid WAV file. I recommend that you put it in a using block.

using(var writer = new WaveFileWriter(outfileName,audioFile.WaveFormat))
{
    writer.WriteSamples(buffer,0,numSamples);
}