我使用NAudio有点新鲜,所以我肯定错过了一些重要的东西,因此这个问题。
从示例/演示代码开始,我将一个类放在一起,就像我可以播放MP3或WAV文件一样简单:
public class AudioPlayer : IDisposable
{
WaveStream _waveStream; // sound data stream
WaveChannel32 _waveChannel32; // sound channel ??
IWavePlayer _iWavePlayer; // sound output driver
public bool IsPlaying
{
get { return _iWavePlayer != null
&& _iWavePlayer.PlaybackState
!= Wave.PlaybackState.Stopped; }
}
public PlaybackState PlaybackState
{
get { return _iWavePlayer.PlaybackState; }
}
public void LoadMp3(byte[] mp3Bytes)
{
Load(CreateInputStreamFromMp3Bytes(mp3Bytes));
}
public void LoadFile(string filename)
{
Load(CreateInputStream(filename));
}
void Load(WaveStream waveStream)
{
if (_iWavePlayer != null)
Dispose();
_iWavePlayer = new WaveOut();
_iWavePlayer.PlaybackStopped +=
new EventHandler(_iWavePlayer_PlaybackStopped);
_waveStream = waveStream;
_waveChannel32 = new WaveChannel32(_waveStream);
_waveChannel32.PadWithZeroes = false;
_iWavePlayer.Init(_waveChannel32);
}
void _iWavePlayer_PlaybackStopped(object sender, EventArgs e)
{
Stop();
}
static WaveStream CreateInputStreamFromMp3Bytes(byte[] mp3Bytes)
{
return new Mp3FileReader(new MemoryStream(mp3Bytes), false);
}
static WaveStream CreateInputStream(string fileName)
{
if (fileName.EndsWith(".wav"))
return new WaveFileReader(fileName);
else if (fileName.EndsWith(".mp3"))
return new Mp3FileReader(fileName);
else
throw new InvalidOperationException("Unsupported extension");
}
public void Play()
{
_iWavePlayer.Play();
}
public void Stop()
{
if (_iWavePlayer != null
&& _iWavePlayer.PlaybackState != PlaybackState.Stopped) {
_iWavePlayer.Stop();
_waveStream.Position = 0;
}
}
public void Dispose()
{
Stop();
if (_iWavePlayer != null) {
_iWavePlayer.Dispose();
_iWavePlayer = null;
}
if (_waveChannel32 != null) {
_waveChannel32.Dispose();
_waveChannel32 = null;
}
if (_waveStream != null) {
_waveStream.Dispose();
_waveStream = null;
}
}
}
我使用相关代码来播放MP3文件(而不是WAV)。
它在大多数情况下都可以正常工作,考虑到我能够在我的项目中替换MediaElements,这非常棒。我遇到的问题是PlaybackState
停留在Playing
而不是在PlaybackStopped触发后更改为Stopped
。要解决这个问题,我订阅PlaybackStopped
并从那里致电Stop()
。
我必须像这样打Stop()
这是正常的,还是我在这里缺少什么?
答案 0 :(得分:2)
看起来像个错误。如果您查看NAudio代码,WaveOut
将不会更改PlaybackState
中的RaisePlaybackStoppedEvent
。但DirectSoundOut
会将其更改为已停止。有点疯狂。
答案 1 :(得分:1)
试试这个:
在Load方法中更改此行:
_iWavePlayer = new WaveOut();
由此:
_iWavePlayer = new WaveOut(WaveCallbackInfo.FunctionCallback());