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c#naudiopcmwasapi

Convert Audio data in IeeeFloat buffer to PCM in buffer

I use NAudio to capture sound input and the input appears as a buffer containing the sound information in IeeeFloat format.

Now that I have this data in the buffer, I want to translate it to PCM at a different sampling rate.

I have already figured out how to convert from IeeeFloat to PCM, and also convert between mono and stereo. Converting the sampling rate is the tough one.

Any solution, preferable using NAudio, that can convert the IeeeFLoat buffer to a buffer with PCM format of choice (including changing sampling rate)?

Solution

  • If you want to resample while you receive data, then you need to perform input driven resampling. I wrote an article on this a while ago.

    NAudio has some helper classes to go from mono to stereo, and float to PCM, but they tend to operate on IWaveProvider or ISampleProvider inputs. Typically if I just had the samples as a raw block of bytes I'd write by own simple code to go from float to PCM and double up the samples. It's not that hard to do and the WaveBuffer class will allow you to read float samples directly from a byte[].