diff options
Diffstat (limited to 'apps/misc.h')
| -rw-r--r-- | apps/misc.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/apps/misc.h b/apps/misc.h index 403a8c53ac..72b8735c8a 100644 --- a/apps/misc.h +++ b/apps/misc.h @@ -238,4 +238,12 @@ int core_load_bmp(const char *filename, struct bitmap *bm, const int bmformat, ssize_t *buf_reqd, struct buflib_callbacks *ops); #endif +/* Convert a volume (in tenth dB) in the range [min_vol, max_vol] + * to a normalized linear value in the range [0, max_norm]. */ +long to_normalized_volume(long vol, long min_vol, long max_vol, long max_norm); + +/* Inverse of to_normalized_volume(), returns the volume in tenth dB + * for the given normalized volume. */ +long from_normalized_volume(long norm, long min_vol, long max_vol, long max_norm); + #endif /* MISC_H */ |