Audio Processing Tools

• ​SRC - Secret Rabbit Code aka libsamplerate - downsampling software
• ​SoX - Sound Exchange

Cross Platform Audio API

• ​portable cross-platform Audio API
  • ​Sphinx 3 sample code using portaudio
  • ​Audio::PortAudio Perl Module - an object oriented interface to the ​PortAudio library

converting to and from different audio formats

(from this ​site) Shell commands to convert audio from one format to other using ​Sox, ​LAME, ​FLAC, and ​madplay:

• flac->wav
  • flac -sd $in -o $out

• flac->mp3
  • flac -sdc $in | lame - $out

• wav->flac
  • flac -s $in -o $out

• wav->mp3
  • lame $in $out

• mp3->flac
  • madplay -q -o wave:- $in | flac -s - -o $out

• mp3->wav
  • sox $in $out