I ctrl+c, and then ctrl+v decoding is carefully defined in the standard. Most decoders are bit stream compatible, which means that the uncompressed output signal decoded from MP3 files will be exactly the same as the output signal mathematically defined in standard documents (within the specified approximate error range). MP3 files have a standard format, that is, frames with 384, 576 or 1 152 sampling points (depending on the version and layer of MPEG), and all frames have associated header information (32 bits) and auxiliary information (9, 17 or 32 bytes), depending on the MPEG version and stereo or single channel. The header and auxiliary information can help the decoder to correctly decode the related huffman encoding data. Therefore, the comparison of most decoders is almost entirely based on their computational efficiency (for example, the memory or CPU time they need in the decoding process).