我试图使用n音讯脱codeμ律恩codeD音频成PCM音频。我服务过帐原料μ律恩codeD音频字节,我发现了一个错误,从n音讯,数据不具有RIFF头。我是否需要添加此不知何故?在code我使用的是:
I'm attempting to use NAudio to decode mu-law encoded audio into pcm audio. My service is POSTed the raw mu-law encoded audio bytes and I'm getting an error from NAudio that the data does not have a RIFF header. Do I need to add this somehow? The code I'm using is:
WaveFileReader reader = new WaveFileReader(tmpMemStream);
using (WaveStream convertedStream = WaveFormatConversionStream.CreatePcmStream(reader))
{
WaveFileWriter.CreateWaveFile(recordingsPath + "/" + outputFileName, convertedStream);
}
我还原始数据保存到磁盘,做这正与没有问题的解码在Matlab。谢谢你。
I'm also saving the raw data to the disk and doing the decoding in Matlab which is working with no problem. Thanks.
推荐答案
由于您只需要原始μ律数据,则不能在其上使用WaveFileReader。相反,创建一个新的类继承自的WaveStream。
Since you just have raw mu-law data, you can't use a WaveFileReader on it. Instead, create a new class that inherits from WaveStream.
在其读
方法,从tmpMemStream返回数据。作为 WAVEFORMAT
返回μ律WAVEFORMAT。
In its Read
method, return data from tmpMemStream. As a WaveFormat
return a mu-law WaveFormat.
下面是你可以使用一个通用助手类:
Here's a generic helper class that you could use:
public class RawSourceWaveStream : WaveStream
{
private Stream sourceStream;
private WaveFormat waveFormat;
public RawSourceWaveStream(Stream sourceStream, WaveFormat waveFormat)
{
this.sourceStream = sourceStream;
this.waveFormat = waveFormat;
}
public override WaveFormat WaveFormat
{
get { return this.waveFormat; }
}
public override long Length
{
get { return this.sourceStream.Length; }
}
public override long Position
{
get
{
return this.sourceStream.Position;
}
set
{
this.sourceStream.Position = value;
}
}
public override int Read(byte[] buffer, int offset, int count)
{
return sourceStream.Read(buffer, offset, count);
}
}
现在你可以继续创建像前面那样转换后的文件,传递RawSourceWaveStream作为输入:
Now you can proceed to create the converted file as you did before, passing in the RawSourceWaveStream as your input:
var waveFormat = WaveFormat.CreateMuLawFormat(8000, 1);
var reader = new RawSourceWaveStream(tmpMemStream, waveFormat);
using (WaveStream convertedStream = WaveFormatConversionStream.CreatePcmStream(reader))
{
WaveFileWriter.CreateWaveFile(recordingsPath + "/" + outputFileName, convertedStream);
}
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