diff options
| author | Rosen Penev <rosenp@gmail.com> | 2020-02-03 15:26:50 -0800 |
|---|---|---|
| committer | Rosen Penev <rosenp@gmail.com> | 2020-03-15 20:17:31 -0700 |
| commit | a78841d6a953c4f40e8196e51bdd4aad995b9104 (patch) | |
| tree | 796c697ee336ecfd5da50952dded2899499b161c /src/mixer | |
| parent | 3ec9fcfc443a68c9f57e0314c47e70ca02a32530 (diff) | |
volume_mapping: get rid of exp10 workaround
exp10 is a GNU function, is not part of C++, and is not available
everywhere.
pow(10,x) is an alternative that works just as well. It is used in musl as
the implementation of exp10.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Diffstat (limited to 'src/mixer')
| -rw-r--r-- | src/mixer/plugins/volume_mapping.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/src/mixer/plugins/volume_mapping.c b/src/mixer/plugins/volume_mapping.c index 61a7138af..beecce640 100644 --- a/src/mixer/plugins/volume_mapping.c +++ b/src/mixer/plugins/volume_mapping.c @@ -34,11 +34,6 @@ #include <stdbool.h> #include "volume_mapping.h" -#ifdef __UCLIBC__ -/* 10^x = 10^(log e^x) = (e^x)^log10 = e^(x * log 10) */ -#define exp10(x) (exp((x) * log(10))) -#endif /* __UCLIBC__ */ - #define MAX_LINEAR_DB_SCALE 24 static inline bool use_linear_dB_scale(long dBmin, long dBmax) @@ -111,9 +106,9 @@ static double get_normalized_volume(snd_mixer_elem_t *elem, if (use_linear_dB_scale(min, max)) return (value - min) / (double)(max - min); - normalized = exp10((value - max) / 6000.0); + normalized = pow(10, (value - max) / 6000.0); if (min != SND_CTL_TLV_DB_GAIN_MUTE) { - min_norm = exp10((min - max) / 6000.0); + min_norm = pow(10, (min - max) / 6000.0); normalized = (normalized - min_norm) / (1 - min_norm); } @@ -159,7 +154,7 @@ static int set_normalized_volume(snd_mixer_elem_t *elem, } if (min != SND_CTL_TLV_DB_GAIN_MUTE) { - min_norm = exp10((min - max) / 6000.0); + min_norm = pow(10, (min - max) / 6000.0); volume = volume * (1 - min_norm) + min_norm; } value = lrint_dir(6000.0 * log10(volume), dir) + max; |