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- From b8ed7496963aafdb6ec3415c4efd1ff98a7e8a1d Mon Sep 17 00:00:00 2001
- From: Rosen Penev <rosenp@gmail.com>
- Date: Mon, 3 Feb 2020 15:26:50 -0800
- Subject: [PATCH 2/3] volume_mapping: get rid of exp10 workaround
-
- pow(10,x) is an alternative that works just as well.
-
- Signed-off-by: Rosen Penev <rosenp@gmail.com>
- ---
- src/mixer/plugins/volume_mapping.c | 11 +++--------
- 1 file 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;
- --
- 2.24.1
-
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