I know that there are libraries ( lame , mpg123 ) that allow you to process mp3 and work with the data of the sound itself, but under the LGPL license, as I understand it, it should be possible to replace it with other versions of such lib in a derived application.
Are there libraries, preferably free ones, for decoding mp3 to pcm format, which can be used without obligatory linking such, for example, for commercial purposes?