Question

When using NAudio to playback an MP3 file [in the console], I can’t figure out how to stop the playback. When I call waveout.Stop() the code just stops running and waveout.Dispose() never gets called.

Has it something to do with the function callback? If it is, how do I fix it?

static string MP3 = @"song.mp3";
static WaveOut waveout;
static WaveStream playback;
static void Main(string[] args)
{
    waveout = new WaveOut(WaveCallbackInfo.FunctionCallback());
    playback = OpenMp3Stream(MP3);
    waveout.Init(playback);
    waveout.Play();
    Console.WriteLine("Started");

    Thread.Sleep(2 * 1000);

    Console.WriteLine("Ending");
    if (waveout.PlaybackState != PlaybackState.Stopped)
        waveout.Stop();
    Console.WriteLine("Stopped");
    waveout.Dispose();
    Console.WriteLine("1st dispose");
    playback.Dispose();
    Console.WriteLine("2nd dispose");
}
private static WaveChannel32 OpenMp3Stream(string fileName)
{
    WaveChannel32 inputStream;
    WaveStream mp3Reader = new Mp3FileReader(fileName);
    WaveStream pcmStream = WaveFormatConversionStream.CreatePcmStream(mp3Reader);
    WaveStream blockAlignedStream = new BlockAlignReductionStream(pcmStream);
    inputStream = new WaveChannel32(blockAlignedStream);
    return inputStream;
}

Answer 1

Are you saying the code hangs in the call to waveOutReset? If so, this is a known issue with function callbacks and certain audio drivers (SoundMAX seems particularly susceptible to this). I checked in a possible fix to the NAudio source code a couple of months ago, so you could try building the latest code and seeing if that fixes the issue.