关于重采样的例外
关于重采样的例外
提问于 2012-11-21 06:25:15
当我使用ResamplerDmoStream并选择除WaveOutput (例如WASAPI，DirectSound)以外的任何东西时，我都遇到了以下异常:无法将COM对象NAudio.DMO.ResamplerMediaComObject转换为接口类型Naudio.Dmo.IMediaObject .
异常调用堆栈：
at System.StubHelpers.StubHelpers.GetCOMIPFromRCW(Object objSrc, IntPtr pCPCMD, IntPtr& ppTarget, Boolean& pfNeedsRelease)
at NAudio.Dmo.IMediaObject.GetInputStatus(Int32 inputStreamIndex, DmoInputStatusFlags& flags)
at NAudio.Dmo.MediaObject.IsAcceptingData(Int32 inputStreamIndex) in NAudio\Dmo\MediaObject.cs:line 468
at NAudio.Wave.ResamplerDmoStream.Read(Byte[] buffer, Int32 offset, Int32 count) in NAudio\Wave\WaveStreams\ResamplerDmoStream.cs:line 136
at NAudio.Wave.Wave16ToFloatProvider.Read(Byte[] destBuffer, Int32 offset, Int32 numBytes) in NAudio\Wave\WaveProviders\Wave16toFloatProvider.cs:line 47
at NAudio.Wave.MixingWaveProvider32.Read(Byte[] buffer, Int32 offset, Int32 count) in NAudio\Wave\WaveProviders\MixingWaveProvider32.cs:line 116
at NAudio.Wave.SampleProviders.WaveToSampleProvider.Read(Single[] buffer, Int32 offset, Int32 count) in NAudio\Wave\SampleProviders\WaveToSampleProvider.cs:line 33
at NAudio.Wave.SampleProviders.MeteringSampleProvider.Read(Single[] buffer, Int32 offset, Int32 count) in NAudio\Wave\SampleProviders\MeteringSampleProvider.cs:line 72
at NAudio.Wave.SampleProviders.VolumeSampleProvider.Read(Single[] buffer, Int32 offset, Int32 sampleCount) in NAudio\Wave\SampleProviders\VolumeSampleProvider.cs:line 42
at NAudio.Wave.SampleProviders.SampleChannel.Read(Single[] buffer, Int32 offset, Int32 sampleCount) in NAudio\Wave\SampleProviders\SampleChannel.cs:line 58
at NAudio.Wave.SampleProviders.MeteringSampleProvider.Read(Single[] buffer, Int32 offset, Int32 count) in NAudio\Wave\SampleProviders\MeteringSampleProvider.cs:line 72
at NAudio.Wave.SampleProviders.MultiplexingSampleProvider.Read(Single[] buffer, Int32 offset, Int32 count) in NAudio\Wave\SampleProviders\MultiplexingSampleProvider.cs:line 93
at NAudio.Wave.SampleProviders.SampleToWaveProvider.Read(Byte[] buffer, Int32 offset, Int32 count) in NAudio\Wave\SampleProviders\SampleToWaveProvider.cs:line 35
at NAudio.Wave.DirectSoundOut.Feed(Int32 bytesToCopy) in NAudio\Wave\WaveOutputs\DirectSoundOut.cs:line 516
at NAudio.Wave.DirectSoundOut.PlaybackThreadFunc() in NAudio\Wave\WaveOutputs\DirectSoundOut.cs:line 415回答 1
Stack Overflow用户
回答已采纳
发布于 2012-11-27 09:35:06
这个问题很可能是在STAThread上创建COM对象(在本例中是driver )(如果使用WinForms或WPF，情况就是这样)，然后将它们传递给NAudio输出驱动程序模型，后者将试图在后台线程上访问它们，这是不允许的。
这是一个非常恼人的问题，因为如果您将您的GUI线程设置为MTAThread，其他内容就会中断(例如，打开文件对话框)。您的主要选择如下：
- 坚持使用有窗口回调的WaveOut。您还可以使用WasapiOutGuiThread，这是我最近添加到演示项目中的一个实验班。这是迄今为止最简单的解决办法。你真的需要使用DirectSound吗？
- 音频管道中没有ResamplerDmoStream。使用WaveFormatConversionStream代替，或者简单地让WASAPI插入一个(它会自动地)
- 创建一个后台线程，用于音频播放，并将消息从您的GUI线程发送到它，告诉它您想要启动，停止，重新定位等。不幸的是，这是一个相当复杂的选择。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/13487558
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