与n音讯

  • Z时代
  • 2024-01-10
  • 分类：问答

我一直在使用n音讯过去数天混合两种波形文件用这种格式混合的WaveStream第二：8000与n音讯

我发现从https://naudio.codeplex.com/discussions/251475，首先我应该将它们转换成32位ieeefloatingpoint编码，然后将转换后的流添加到WaveMixerStream32。之后，我应该使用Wave32To16Stream将混合数据转换为16位/采样流，将获得的流转换为单声道并最终将单声道16位/采样转换为单声道8位/采样。

我按照我解释写这些代码行：

WaveFileReader r1 = new WaveFileReader(...); 
    WaveFileReader r2 = new WaveFileReader(...); 
    WaveFormat OutputWaveFormat = WaveFormat.CreateCustomFormat(WaveFormatEncoding.Pcm, 8000, 1, 16000, 2, 16); 
    WaveFormat InputWaveFormat = WaveFormat.CreateALawFormat(8000, 1); 
    WaveFormatConversionStream ConversionStream1 = new WaveFormatConversionStream(OutputWaveFormat, r1); 
    WaveFormatConversionStream ConversionStream2 = new WaveFormatConversionStream(OutputWaveFormat, r2); 
    WaveChannel32 WaveChannel32_1 = new WaveChannel32(ConversionStream1); 
    WaveChannel32 WaveChannel32_2 = new WaveChannel32(ConversionStream2); 
    WaveMixerStream32 mixer32 = new WaveMixerStream32(); 
    mixer32.AddInputStream(WaveChannel32_1); 
    mixer32.AddInputStream(WaveChannel32_2);//(*) 
    Wave32To16Stream stereo16 = new Wave32To16Stream(mixer32); 
    StereoToMonoProvider16 mono16 = new StereoToMonoProvider16(m_Wave32To16Stream);

线（*）后我有一个流，例如：0 0 32 60 0 0 32 60 0 0 59 126 0 0 59 126 ... 但应用Wave32To16Stream后，我有一个在立体声16只有一个序列，因此在mono16！ 这一步应该怎么做？

回答：

答案是非常简单的比我想象的。我只需要将ALaw转换为PCM，然后添加两个波形流，我使用G711 codeproject文章中的ALawDecoder完成。

r1 = new WaveFileReader(...); 
r2 = new WaveFileReader(...); 
r1.Read(arr1, 0, arr1.Length);  
r2.Read(arr2, 0, arr2.Length); 
short[] firstPCM16 = ALawDecoder.ALawDecode(arr1); 
short[] secondPCM16 = ALawDecoder.ALawDecode(arr2); 
byte[] result1 = new byte[firstPCM16.Length * sizeof(short)]; 
byte[] result1 = new byte[secondPCM16.Length * sizeof(short)]; 
Buffer.BlockCopy(firstPCM16, 0, result1, 0, result1.Length); 
Buffer.BlockCopy(secondPCM16, 0, result2, 0, result2.Length); 
for (...) 
{       
    mixed[i] = (byte)(result1[i] + result2[i]);//No need to dividing by 2 because r1 and r2 are 8 bit ALaw and return value of ALawDecoder is 16 bit pcm 
}

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