1 /*
2   This file is part of Deadbeef Player source code
3   http://deadbeef.sourceforge.net
4 
5   pcm volume manipulation routines
6 
7   Copyright (C) 2009-2013 Alexey Yakovenko
8 
9   This software is provided 'as-is', without any express or implied
10   warranty.  In no event will the authors be held liable for any damages
11   arising from the use of this software.
12 
13   Permission is granted to anyone to use this software for any purpose,
14   including commercial applications, and to alter it and redistribute it
15   freely, subject to the following restrictions:
16 
17   1. The origin of this software must not be misrepresented; you must not
18      claim that you wrote the original software. If you use this software
19      in a product, an acknowledgment in the product documentation would be
20      appreciated but is not required.
21   2. Altered source versions must be plainly marked as such, and must not be
22      misrepresented as being the original software.
23   3. This notice may not be removed or altered from any source distribution.
24 
25   Alexey Yakovenko waker@users.sourceforge.net
26 */
27 #include <math.h>
28 #include <stdio.h>
29 #include "volume.h"
30 #include "conf.h"
31 
32 #define VOLUME_MIN (-50.f)
33 
34 static float volume_db = 0; // in dB
35 static float volume_amp = 1; // amplitude [0..1]
36 static int audio_mute = 0;
37 
38 void
volume_set_db(float dB)39 volume_set_db (float dB) {
40     if (dB < VOLUME_MIN) {
41         dB = VOLUME_MIN;
42     }
43     if (dB > 0) {
44         dB = 0;
45     }
46     conf_set_float ("playback.volume", dB);
47     volume_db = dB;
48     volume_amp = dB > VOLUME_MIN ? db_to_amp (dB) : 0;
49     audio_mute = 0;
50 }
51 
52 float
volume_get_db(void)53 volume_get_db (void) {
54     return volume_db;
55 }
56 
57 void
volume_set_amp(float amp)58 volume_set_amp (float amp) {
59     if (amp < 0) {
60         amp = 0;
61     }
62     if (amp > 1) {
63         amp = 1;
64     }
65     volume_amp = amp;
66     volume_db = amp > 0 ? amp_to_db (amp) : VOLUME_MIN;
67     conf_set_float ("playback.volume", volume_db);
68     audio_mute = 0;
69 }
70 
71 float
volume_get_amp(void)72 volume_get_amp (void) {
73     return volume_amp;
74 }
75 
76 float
db_to_amp(float dB)77 db_to_amp (float dB) {
78 //    return pow (10, dB/20.f);
79     // thanks to he for this hack
80     const float ln10=2.3025850929940002f;
81     return exp(ln10*dB/20.f);
82 }
83 
84 float
amp_to_db(float amp)85 amp_to_db (float amp) {
86     return 20*log10 (amp);
87 }
88 
89 float
volume_get_min_db(void)90 volume_get_min_db (void) {
91     return VOLUME_MIN;
92 }
93 
94 void
audio_set_mute(int mute)95 audio_set_mute (int mute) {
96     audio_mute = mute;
97 }
98 
99 int
audio_is_mute(void)100 audio_is_mute (void) {
101     return audio_mute;
102 }
103