AcmNotPossible调用acmStreamOpen，naudio [英] AcmNotPossible calling acmStreamOpen, naudio

问题描述

我正在尝试转换

PCM S16 LE (araw)
Mono, Sample rate 22050, Bit pr. sample 16 

到

PCM mulaw (PCM MU-LAW)
Mono, Sample rate 8000hz, Bit pr. sample is 8. 

WaveFormat.CreateMuLawFormat(8000,1)或什至更通用的WaveFormat.CreateCustomFormat，其中我已指定与源流相同的WaveFormatEncoding引发相同的异常.

WaveFormat.CreateMuLawFormat(8000,1) or even a more generic WaveFormat.CreateCustomFormat where I have specified the same WaveFormatEncoding as the source stream is throwing the same exception.

AcmNotPossible calling acmStreamOpen

我在这里想念东西吗?

任何线索都将不胜感激.

Any leads will be greatly appreciated.

推荐答案

ACM mu-law编码器期望其输入为16位.如果您使用mu或a-law，则采样率也可能很低.以下两行代码将创建一个零长度的PCM 16位流，并将其传递到WaveFormatConversionStream中，以将其转换为a-law.除非由于某些原因您没有在计算机上安装G.711编码器，否则它不应引发无法进行转换"错误.

The ACM mu-law encoder expects its input to be 16 bit. If you're working with mu or a-law, the sample rate is likely to be low as well. The following two lines of code will create a zero-length stream of PCM 16 bit and pass it into a WaveFormatConversionStream to convert it to a-law. It should not throw a "conversion not possible" error unless for some reason you don't have the G.711 encoder installed on your machine.

var s = new RawSourceWaveStream(new MemoryStream(), new WaveFormat(8000,16,1));
var c = new WaveFormatConversionStream(WaveFormat.CreateALawFormat(8000,1), s);

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