Question

我有一系列44 kHz 16位双通道无压缩波形文件（从资源中读取），并希望应用淡出和淡入效果来创建所有WAV序列中的流文件。

资源读取，并使16位波流正确发生。目标格式也显示正确，但我在下面的waveformat coversion步骤中将acmnotpossible作为例外。我做错了什么？

String ResToPlay2 = NameSpaceString + ".Resources." + inWave2 + ".wav";
Stream _audioStream2;
int wavdur2 = 0;
Double fadeDurDbl2 = 0;
int fadeDur2 = 0;
if (!resA.GetManifestResourceStream (ResToPlay2).Equals (Stream.Null))
{
    _audioStream2 = resA.GetManifestResourceStream (ResToPlay2);
    WaveStream wavePCMStream2 = WaveFormatConversionStream.CreatePcmStream (new WaveFileReader (_audioStream2));
    WaveFormat targetFmt2 = new WaveFormat (44100, 32, 2);
    WaveStream waveStream2 = new WaveFormatConversionStream(targetFmt2,wavePCMStream2);
    using (waveStream2)
    {
        wavdur2 = (int) waveStream2.TotalTime.Milliseconds;
        var fader2 = new FadeInOutSampleProvider(new WaveToSampleProvider(waveStream2));
        fadeDurDbl2 = (wavdur2*OverlapPCT) / 100;
        fadeDur2 = (int) Math.Round(fadeDurDbl2, 0);
        fader2.BeginFadeIn (fadeDur2);
        var stwp2 = new NAudio.Wave.SampleProviders.SampleToWaveProvider (fader2);
        WaveFileWriter.CreateWaveFile (Application.StartupPath + "\\" + "fadedIn_?.wav", stwp2);
    }
}

Answer 1

我不确定为什么要使用WaveFormatConversionStream，因为你是从PCM开始的。首先访问示例提供程序，然后您可以使用FadeInOutSampleProvider

var reader = new WaveFileReader (_audioStream2)
var sampleProvider = SampleProviderConverters.ConvertWaveProviderIntoSampleProvider(reader);
var fader = new FadeInOutSampleProvider (sampleProvider);

使用NAudio实现一系列44 kHz 16位双通道波形文件的淡出和淡入

1 个答案: