我正在尝试开发一个应用程序,在该应用程序中建立SIP呼叫,然后我捕获rtp音频数据包。因为它们是编码所以我需要解码它们并保存它有.wav文件。尝试使用NAudio但没有奏效。有没有使用NAudio或任何其他来源解决这个问题的解决方案...
我使用的代码如下。 data是rtp数据包数据所在的字节数组。
System.IO.MemoryStream stream = new System.IO.MemoryStream(data);
RawSourceWaveStream rsws = new RawSourceWaveStream(stream, WaveFormat.CreateMuLawFormat(8000,1));
WaveStream conversionStream = WaveFormatConversionStream.CreatePcmStream(rsws);
WaveStream blockAlignedStream = new BlockAlignReductionStream(conversionStream);
byte[] buffer = new byte[udpHeader.Data.Length];
blockAlignedStream.Read(buffer, 0, udpHeader.Data.Length);
writer.WriteData(buffer, 0, buffer.Length);
先谢谢。
答案 0 :(得分:0)
迟到总比没有好!
使用Mark Heath的以下助手类 从 Using NAudio to decode mu-law audio
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);
}
}
获取最新的NAudio.dll和NAudio.WindowsMediaFormat.dll
来自
然后执行以下操作将U-Law或Mu-Law转换为Wav:
Stream tmpMemStream = new FileStream(Server.MapPath("/input/") + "input.voc", FileMode.Open, FileAccess.Read);
var waveFormat = WaveFormat.CreateMuLawFormat(8000, 1); // Feel free to tweak this number
var reader = new RawSourceWaveStream(tmpMemStream, waveFormat);
using (WaveStream convertedStream = WaveFormatConversionStream.CreatePcmStream(reader))
{
WaveFileWriter.CreateWaveFile(Server.MapPath("/output/") + "output.wav", convertedStream);
}
tmpMemStream.Close();
请记住尊重这些音频文件所有者的隐私!