libsamplerate

Secret Rabbit Code: a Sample Rate Converter for audio

Secret Rabbit Code (aka libsamplerate) is a Sample Rate Converter for audio. SRC is capable of arbitrary and time varying conversions ; from downsampling by a factor of 12 to upsampling by the same factor. Arbitrary in this case means that the ratio of input and output sample rates can be an irrational number. The conversion ratio can also vary with time for speeding up and slowing down effects.