C# 从PCM样本创建波流
我检查了NAudio及其C# 从PCM样本创建波流,c#,audio,naudio,C#,Audio,Naudio,我检查了NAudio及其WaveStream相关类,但找不到基于我提供的PCM样本创建WaveStream的内置方法 理想情况下,我想这样做: byte[] samples = ... WaveFormat waveFormat = new WaveFormat(audioSampleRate, audioBitsPerSample, au
WaveStream
相关类,但找不到基于我提供的PCM样本创建WaveStream
的内置方法
理想情况下,我想这样做:
byte[] samples = ...
WaveFormat waveFormat = new WaveFormat(audioSampleRate,
audioBitsPerSample,
audioChannels);
WaveStream waveStream = CreateWaveStreamfromSamples(waveFormat,
samples);
有没有办法使用NAudio实现这一点?
在Hans,Mark澄清后编辑(感谢反馈):
我需要一个可以传递给SoundPlayer.Play的流,这不适合WaveStream
。在我的项目中,我最终实现了下面的类,该类获取样本和波形格式
,并可由SoundPlayer
播放
public class MemoryWaveStream : Stream
{
public override bool CanSeek { get { return false; } }
public override bool CanWrite { get { return false; } }
public override bool CanRead { get { return true; } }
public override long Length { get { return _waveStream.Length; } }
public override long Position { get { return _waveStream.Position; } set { _waveStream.Position = value; } }
private MemoryStream _waveStream;
public MemoryWaveStream(byte[] sampleData, WaveFormat waveFormat)
{
_waveStream = new MemoryStream();
BinaryWriter bw = new BinaryWriter(_waveStream);
bw.Write(new char[4] { 'R', 'I', 'F', 'F' });
int length = 36 + sampleData.Length;
bw.Write(length);
bw.Write(new char[8] { 'W', 'A', 'V', 'E', 'f', 'm', 't', ' ' });
waveFormat.Serialize(bw);
bw.Write(new char[4] { 'd', 'a', 't', 'a' });
bw.Write(sampleData.Length);
bw.Write(sampleData, 0, sampleData.Length);
_waveStream.Position = 0;
}
public override int Read(byte[] buffer, int offset, int count)
{
return _waveStream.Read(buffer, offset, count);
}
public override void Flush()
{
_waveStream.Flush();
}
public override long Seek(long offset, SeekOrigin origin)
{
return _waveStream.Seek(offset, origin);
}
public override void SetLength(long value)
{
throw new NotImplementedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotImplementedException();
}
}
不,一点也不像。但是,您可以创建自己的。wave\wavestream\waveilereader.cs源代码文件可能是最好的入门文档。您可以从中剥离大量内容,用正确初始化的MemoryStream替换波流。这里有一个类,您可以根据字节数组将MemoryStream
传递到其中。我可能会在NAudio 1.4中包含类似的内容,因为我收到很多关于如何实现这一点的支持请求
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);
}
}
是的,我做了我自己的(在内部使用MemoryStream实现流派生类,只需拍打一个Wave头),但我更喜欢内置的东西,而不是重新发明轮子。我确实提交了一个补丁-我不知道这个类对整个项目是否有用,我们将看到;-)@BrokenGlass-WaveStreams不应从其只读方法音频返回波头。WaveFormat
由waveilewriter
在写入WAV文件时使用。@Mark-我的错误。我需要一个可由SoundPlayer播放的流,因此从WaveStream派生可能不是正确的选择。我将在编辑中发布我的最终结果。感谢您提供自定义类。