1 | //remove.c: |
---|
2 | |
---|
3 | /* |
---|
4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009 |
---|
5 | * |
---|
6 | * This file is part of libroardsp a part of RoarAudio, |
---|
7 | * a cross-platform sound system for both, home and professional use. |
---|
8 | * See README for details. |
---|
9 | * |
---|
10 | * This file is free software; you can redistribute it and/or modify |
---|
11 | * it under the terms of the GNU General Public License version 3 |
---|
12 | * as published by the Free Software Foundation. |
---|
13 | * |
---|
14 | * libroardsp is distributed in the hope that it will be useful, |
---|
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
17 | * GNU General Public License for more details. |
---|
18 | * |
---|
19 | * You should have received a copy of the GNU General Public License |
---|
20 | * along with this software; see the file COPYING. If not, write to |
---|
21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
---|
22 | * |
---|
23 | */ |
---|
24 | |
---|
25 | #include "libroardsp.h" |
---|
26 | |
---|
27 | int roar_remove_init (struct roar_remove_state * state) { |
---|
28 | if ( state == NULL ) |
---|
29 | return -1; |
---|
30 | |
---|
31 | memset(state, 0, sizeof(struct roar_remove_state)); |
---|
32 | |
---|
33 | state->old = 65535; |
---|
34 | |
---|
35 | return 0; |
---|
36 | } |
---|
37 | |
---|
38 | int roar_remove (void * inout, void * subs, int samples, int bits, struct roar_remove_state * state) { |
---|
39 | if ( inout == NULL || subs == NULL || samples < 0 ) |
---|
40 | return -1; |
---|
41 | |
---|
42 | switch (bits) { |
---|
43 | case 8: return roar_remove_8 (inout, subs, samples, state); break; |
---|
44 | case 16: return roar_remove_16(inout, subs, samples, state); break; |
---|
45 | case 32: return roar_remove_32(inout, subs, samples, state); break; |
---|
46 | } |
---|
47 | |
---|
48 | return -1; |
---|
49 | } |
---|
50 | |
---|
51 | int roar_remove_8 (int8_t * inout, int8_t * subs, int samples, struct roar_remove_state * state) { |
---|
52 | return -1; |
---|
53 | } |
---|
54 | int roar_remove_16 (int16_t * inout, int16_t * subs, int samples, struct roar_remove_state * state) { |
---|
55 | int i; |
---|
56 | register int32_t s; |
---|
57 | register int32_t peak; |
---|
58 | |
---|
59 | if ( state == NULL ) { |
---|
60 | for (i = 0; i < samples; i++) { |
---|
61 | s = inout[i]; |
---|
62 | s -= subs[i]; |
---|
63 | inout[i] = s; |
---|
64 | } |
---|
65 | } else { |
---|
66 | peak = 65535; |
---|
67 | for (i = 0; i < samples; i++) { |
---|
68 | s = inout[i]; |
---|
69 | s -= subs[i]; |
---|
70 | s = s < 0 ? -s : s; // we true 32 bit, not int operation here |
---|
71 | if ( s > peak ) |
---|
72 | peak = s; |
---|
73 | } |
---|
74 | |
---|
75 | for (i = 0; i < samples; i++) { |
---|
76 | s = -subs[i]; |
---|
77 | s *= 65535; |
---|
78 | s /= peak; |
---|
79 | s += inout[i]; |
---|
80 | inout[i] = s; |
---|
81 | } |
---|
82 | } |
---|
83 | |
---|
84 | return 0; |
---|
85 | } |
---|
86 | int roar_remove_32 (int32_t * inout, int32_t * subs, int samples, struct roar_remove_state * state) { |
---|
87 | return -1; |
---|
88 | } |
---|
89 | |
---|
90 | int roar_remove_so (void * subout, void * in, int samples, int bits, struct roar_remove_state * state) { |
---|
91 | if ( subout == NULL || in == NULL || samples < 0 ) |
---|
92 | return -1; |
---|
93 | |
---|
94 | switch (bits) { |
---|
95 | case 16: return roar_remove_so16(subout, in, samples, state); break; |
---|
96 | } |
---|
97 | |
---|
98 | return -1; |
---|
99 | } |
---|
100 | |
---|
101 | int roar_remove_so16 (int16_t * subout, int16_t * in, int samples, struct roar_remove_state * state) { |
---|
102 | int i; |
---|
103 | register int32_t s; |
---|
104 | register int32_t peak; |
---|
105 | |
---|
106 | if ( state == NULL ) { |
---|
107 | for (i = 0; i < samples; i++) { |
---|
108 | s = -subout[i]; |
---|
109 | s += in[i]; |
---|
110 | subout[i] = s; |
---|
111 | } |
---|
112 | } else { |
---|
113 | peak = 65535; |
---|
114 | for (i = 0; i < samples; i++) { |
---|
115 | s = -subout[i]; |
---|
116 | s += in[i]; |
---|
117 | s = s < 0 ? -s : s; // we true 32 bit, not int operation here |
---|
118 | if ( s > peak ) |
---|
119 | peak = s; |
---|
120 | } |
---|
121 | |
---|
122 | for (i = 0; i < samples; i++) { |
---|
123 | s = -subout[i]; |
---|
124 | s *= 65535; |
---|
125 | s /= peak; |
---|
126 | s += in[i]; |
---|
127 | subout[i] = s; |
---|
128 | } |
---|
129 | } |
---|
130 | |
---|
131 | return 0; |
---|
132 | } |
---|
133 | |
---|
134 | //ll |
---|