X-CUBE-AUDIO spiritMP3 license
I am look into to use X-CUBE-AUDIO spiritMP3 for encode and decode MP3 but reading the documentation I found the following:
There are no differences between the demo and the commercial version except bitrate restrictions. (Same folders structure, same API, same file names, etc). The demo version supports only the highest bit rates, i.e., 320 kbps for Layer-3, 384 kbps for Layer-2, and 448 kbps for Layer-1. As a consequence, the demo version cannot support Variable Bit Rate (VBR) files.
I thought X-CUBE-AUDIO was completely free and looking into the code it seems like it is possible to change bit rate (however I have not tested it yet). Since my application is for speech and datastorage is limited, I need to now if it is possible to change bit rate or it will come with a license cost. If it is license cost, I will need to look for another MP3 library and I prefer to know this before doing the actual implementation.