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src/musicutils.h: aubio_level_detection input is a constant

--- a/src/mathutils.c

+++ b/src/mathutils.c

@@ -564,7 +564,7 @@

 }

 smpl_t

-aubio_level_detection (fvec_t * o, smpl_t threshold)

+aubio_level_detection (const fvec_t * o, smpl_t threshold)

 {

   smpl_t db_spl = aubio_db_spl (o);

   if (db_spl < threshold) {

--- a/src/musicutils.h

+++ b/src/musicutils.h

@@ -154,7 +154,7 @@

   \return level in dB SPL if level >= threshold, 1. otherwise

 */

-smpl_t aubio_level_detection (fvec_t * v, smpl_t threshold);

+smpl_t aubio_level_detection (const fvec_t * v, smpl_t threshold);

 #ifdef __cplusplus

 }