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52 lines
1.7 KiB
52 lines
1.7 KiB
From 6b3250a3fb4a854d19980868ed187ca21f0e5ed8 Mon Sep 17 00:00:00 2001
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From: Rosen Penev <rosenp@gmail.com>
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Date: Mon, 3 Feb 2020 15:26:50 -0800
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Subject: [PATCH] volume_mapping: get rid of exp10 workaround
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exp10 is a GNU function, is not part of C++, and is not available
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everywhere.
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pow(10,x) is an alternative that works just as well.
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Signed-off-by: Rosen Penev <rosenp@gmail.com>
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---
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src/mixer/plugins/volume_mapping.c | 11 +++--------
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1 file changed, 3 insertions(+), 8 deletions(-)
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diff --git a/src/mixer/plugins/volume_mapping.c b/src/mixer/plugins/volume_mapping.c
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index 61a7138af..beecce640 100644
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--- a/src/mixer/plugins/volume_mapping.c
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+++ b/src/mixer/plugins/volume_mapping.c
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@@ -34,11 +34,6 @@
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#include <stdbool.h>
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#include "volume_mapping.h"
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-#ifdef __UCLIBC__
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-/* 10^x = 10^(log e^x) = (e^x)^log10 = e^(x * log 10) */
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-#define exp10(x) (exp((x) * log(10)))
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-#endif /* __UCLIBC__ */
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-
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#define MAX_LINEAR_DB_SCALE 24
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static inline bool use_linear_dB_scale(long dBmin, long dBmax)
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@@ -111,9 +106,9 @@ static double get_normalized_volume(snd_mixer_elem_t *elem,
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if (use_linear_dB_scale(min, max))
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return (value - min) / (double)(max - min);
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- normalized = exp10((value - max) / 6000.0);
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+ normalized = pow(10, (value - max) / 6000.0);
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if (min != SND_CTL_TLV_DB_GAIN_MUTE) {
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- min_norm = exp10((min - max) / 6000.0);
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+ min_norm = pow(10, (min - max) / 6000.0);
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normalized = (normalized - min_norm) / (1 - min_norm);
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}
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@@ -159,7 +154,7 @@ static int set_normalized_volume(snd_mixer_elem_t *elem,
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}
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if (min != SND_CTL_TLV_DB_GAIN_MUTE) {
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- min_norm = exp10((min - max) / 6000.0);
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+ min_norm = pow(10, (min - max) / 6000.0);
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volume = volume * (1 - min_norm) + min_norm;
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}
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value = lrint_dir(6000.0 * log10(volume), dir) + max;
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