Question

我必须解码立体声mp4文件并将L和R频道映射到5.1 or 7.1 surround。另外，我必须提供特定的输出格式：16bit pcm 44.1kHz。将音频源转换为44100Hz 16bit没问题。唯一的问题是通道混合。我有以下编码：

const string filename = @"stereo.mp3";
IWaveSource waveSource = CodecFactory.Instance.GetCodec(filename)
    .AppendSource(x => new CSCore.Streams.CachedSoundSource(x))
    .ChangeSampleRate(44100) //44.1kHz
    .ToSampleSource()
    .ToWaveSource(16); //16bit

这里的官方项目页面：http://cscore.codeplex.com/告诉我可以进行频道混音。我找到了CSCore.DSP.ChannelMatrix课程，但很难弄清楚如何使用它。也许有人可以帮助我？

Answer 1

你是绝对正确的，你必须使用CSCore.DSP.ChannelMatrix类。我为你创建了一个小例子并添加了一些评论。它应该是自我解释：

Data1

我强烈建议您使用预定义的通道矩阵。当然，如果您需要一些自定义值，请在上面的示例中定义您自己的值。

顺便说一下。您还可以实时更改频道矩阵：只需对myfun进行更改，然后再调用CommitChannelMatrixChanges（当然您必须存储static void Main(string[] args) { const string filename = @"stereo.mp3"; /* * First of all you need a channel matrix that fits your needs. * There are many ways to get one...: */ //Simply use one of the predefined... ChannelMatrix channelMatrix = ChannelMatrix.StereoToSevenDotOneSurround; //or //use some kind of factory to get one channelMatrix = ChannelMatrix.GetMatrix( ChannelMasks.StereoMask, ChannelMasks.SevenDotOneMask); //or //or create your own one (the matrix below equals the two above but of course you can use custom values) //the rows represent your input channels (the stereo signal) and the columns your output channels. //specify with a value from 0-1 how much percentage of the L (row index 0) or the R (row index 1) channel //you want to apply to the specific column (the columns are getting mapped to the output channel mask // -> the SevenDotOneMask ordered by the values of the certain flags inside of the channel mask). channelMatrix = new ChannelMatrix( ChannelMasks.StereoMask, ChannelMasks.SevenDotOneMask); channelMatrix.SetMatrix( new[,] { {0.222f, 0f, 0.157f, 0.022f, 0.189f, 0.116f, 0.203f, 0.090f}, {0f, 0.222f, 0.157f, 0.022f, 0.116f, 0.189f, 0.090f, 0.203f} }); IWaveSource waveSource = CodecFactory.Instance.GetCodec(filename) .AppendSource(x => new CSCore.Streams.CachedSoundSource(x)) .ChangeSampleRate(44100) //44.1kHz .AppendSource(x => new DmoChannelResampler(x, channelMatrix)) //append a channelresampler with the channelmatrix .ToSampleSource() .ToWaveSource(16); //16bit ... }实例 - ＆gt;使用channelMatrix进行更改DmoChannelResampler方法）。

CSCore - 将立体声转换为环绕声

1 个答案: