The parameter \p method is a string that can be any of:
- - `energy`, `hfc`, `complex`, `phase`, `specdiff`, `kl`, `mkl`, `specflux`
- - `centroid`, `spread`, `skewness`, `kurtosis`, `slope`, `decrease`, `rolloff`
+ - onset novelty functions: `complex`, `energy`, `hfc`, `kl`, `mkl`,
+ `phase`, `specdiff`, `specflux`, `wphase`,
+
+ - spectral descriptors: `centroid`, `decrease`, `kurtosis`, `rolloff`,
+ `skewness`, `slope`, `spread`.
*/
aubio_specdesc_t *new_aubio_specdesc (const char_t * method, uint_t buf_size);