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Diffstat (limited to 'sound/oss/gus_vol.c')
-rw-r--r-- | sound/oss/gus_vol.c | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/sound/oss/gus_vol.c b/sound/oss/gus_vol.c deleted file mode 100644 index 6ae6924e1647..000000000000 --- a/sound/oss/gus_vol.c +++ /dev/null | |||
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1 | |||
2 | /* | ||
3 | * gus_vol.c - Compute volume for GUS. | ||
4 | * | ||
5 | * | ||
6 | * Copyright (C) by Hannu Savolainen 1993-1997 | ||
7 | * | ||
8 | * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) | ||
9 | * Version 2 (June 1991). See the "COPYING" file distributed with this software | ||
10 | * for more info. | ||
11 | */ | ||
12 | #include "sound_config.h" | ||
13 | |||
14 | #include "gus.h" | ||
15 | #include "gus_linearvol.h" | ||
16 | |||
17 | #define GUS_VOLUME gus_wave_volume | ||
18 | |||
19 | |||
20 | extern int gus_wave_volume; | ||
21 | |||
22 | /* | ||
23 | * Calculate gus volume from note velocity, main volume, expression, and | ||
24 | * intrinsic patch volume given in patch library. Expression is multiplied | ||
25 | * in, so it emphasizes differences in note velocity, while main volume is | ||
26 | * added in -- I don't know whether this is right, but it seems reasonable to | ||
27 | * me. (In the previous stage, main volume controller messages were changed | ||
28 | * to expression controller messages, if they were found to be used for | ||
29 | * dynamic volume adjustments, so here, main volume can be assumed to be | ||
30 | * constant throughout a song.) | ||
31 | * | ||
32 | * Intrinsic patch volume is added in, but if over 64 is also multiplied in, so | ||
33 | * we can give a big boost to very weak voices like nylon guitar and the | ||
34 | * basses. The normal value is 64. Strings are assigned lower values. | ||
35 | */ | ||
36 | |||
37 | unsigned short gus_adagio_vol(int vel, int mainv, int xpn, int voicev) | ||
38 | { | ||
39 | int i, m, n, x; | ||
40 | |||
41 | |||
42 | /* | ||
43 | * A voice volume of 64 is considered neutral, so adjust the main volume if | ||
44 | * something other than this neutral value was assigned in the patch | ||
45 | * library. | ||
46 | */ | ||
47 | x = 256 + 6 * (voicev - 64); | ||
48 | |||
49 | /* | ||
50 | * Boost expression by voice volume above neutral. | ||
51 | */ | ||
52 | |||
53 | if (voicev > 65) | ||
54 | xpn += voicev - 64; | ||
55 | xpn += (voicev - 64) / 2; | ||
56 | |||
57 | /* | ||
58 | * Combine multiplicative and level components. | ||
59 | */ | ||
60 | x = vel * xpn * 6 + (voicev / 4) * x; | ||
61 | |||
62 | #ifdef GUS_VOLUME | ||
63 | /* | ||
64 | * Further adjustment by installation-specific master volume control | ||
65 | * (default 60). | ||
66 | */ | ||
67 | x = (x * GUS_VOLUME * GUS_VOLUME) / 10000; | ||
68 | #endif | ||
69 | |||
70 | #ifdef GUS_USE_CHN_MAIN_VOLUME | ||
71 | /* | ||
72 | * Experimental support for the channel main volume | ||
73 | */ | ||
74 | |||
75 | mainv = (mainv / 2) + 64; /* Scale to 64 to 127 */ | ||
76 | x = (x * mainv * mainv) / 16384; | ||
77 | #endif | ||
78 | |||
79 | if (x < 2) | ||
80 | return (0); | ||
81 | else if (x >= 65535) | ||
82 | return ((15 << 8) | 255); | ||
83 | |||
84 | /* | ||
85 | * Convert to GUS's logarithmic form with 4 bit exponent i and 8 bit | ||
86 | * mantissa m. | ||
87 | */ | ||
88 | |||
89 | n = x; | ||
90 | i = 7; | ||
91 | if (n < 128) | ||
92 | { | ||
93 | while (i > 0 && n < (1 << i)) | ||
94 | i--; | ||
95 | } | ||
96 | else | ||
97 | { | ||
98 | while (n > 255) | ||
99 | { | ||
100 | n >>= 1; | ||
101 | i++; | ||
102 | } | ||
103 | } | ||
104 | /* | ||
105 | * Mantissa is part of linear volume not expressed in exponent. (This is | ||
106 | * not quite like real logs -- I wonder if it's right.) | ||
107 | */ | ||
108 | m = x - (1 << i); | ||
109 | |||
110 | /* | ||
111 | * Adjust mantissa to 8 bits. | ||
112 | */ | ||
113 | if (m > 0) | ||
114 | { | ||
115 | if (i > 8) | ||
116 | m >>= i - 8; | ||
117 | else if (i < 8) | ||
118 | m <<= 8 - i; | ||
119 | } | ||
120 | return ((i << 8) + m); | ||
121 | } | ||
122 | |||
123 | /* | ||
124 | * Volume-values are interpreted as linear values. Volume is based on the | ||
125 | * value supplied with SEQ_START_NOTE(), channel main volume (if compiled in) | ||
126 | * and the volume set by the mixer-device (default 60%). | ||
127 | */ | ||
128 | |||
129 | unsigned short gus_linear_vol(int vol, int mainvol) | ||
130 | { | ||
131 | int mixer_mainvol; | ||
132 | |||
133 | if (vol <= 0) | ||
134 | vol = 0; | ||
135 | else if (vol >= 127) | ||
136 | vol = 127; | ||
137 | |||
138 | #ifdef GUS_VOLUME | ||
139 | mixer_mainvol = GUS_VOLUME; | ||
140 | #else | ||
141 | mixer_mainvol = 100; | ||
142 | #endif | ||
143 | |||
144 | #ifdef GUS_USE_CHN_MAIN_VOLUME | ||
145 | if (mainvol <= 0) | ||
146 | mainvol = 0; | ||
147 | else if (mainvol >= 127) | ||
148 | mainvol = 127; | ||
149 | #else | ||
150 | mainvol = 127; | ||
151 | #endif | ||
152 | return gus_linearvol[(((vol * mainvol) / 127) * mixer_mainvol) / 100]; | ||
153 | } | ||