[1626] | 1 | //midside.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009 |
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| 5 | * |
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| 6 | * This file is part of libroardsp a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroardsp is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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| 25 | #include "libroardsp.h" |
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| 26 | |
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[1627] | 27 | int roar_conv_s2ms_8 (void * out, void * in, int samples) { |
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[1628] | 28 | char * ip = in; |
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| 29 | char * op = out; |
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| 30 | register int i; |
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| 31 | register char mid; |
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| 32 | register char side; |
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| 33 | |
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| 34 | for (i = 0; i < samples; i += 2) { |
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| 35 | mid = (ip[i] + ip[i+1])/2; |
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| 36 | side = (ip[i] - ip[i+1])/2; |
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| 37 | op[i ] = mid; |
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| 38 | op[i+1] = side; |
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| 39 | } |
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| 40 | |
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| 41 | return 0; |
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[1627] | 42 | } |
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| 43 | |
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| 44 | int roar_conv_s2ms_16 (void * out, void * in, int samples) { |
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[1628] | 45 | int16_t * ip = in; |
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| 46 | int16_t * op = out; |
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| 47 | register int i; |
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| 48 | register int16_t mid; |
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| 49 | register int16_t side; |
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| 50 | |
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| 51 | for (i = 0; i < samples; i += 2) { |
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| 52 | mid = (ip[i] + ip[i+1])/2; |
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| 53 | side = (ip[i] - ip[i+1])/2; |
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| 54 | op[i ] = mid; |
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| 55 | op[i+1] = side; |
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| 56 | } |
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| 57 | |
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| 58 | return 0; |
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[1627] | 59 | } |
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| 60 | |
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| 61 | int roar_conv_s2ms_32 (void * out, void * in, int samples) { |
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[1628] | 62 | int32_t * ip = in; |
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| 63 | int32_t * op = out; |
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| 64 | register int i; |
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| 65 | register int32_t mid; |
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| 66 | register int32_t side; |
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| 67 | |
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| 68 | for (i = 0; i < samples; i += 2) { |
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| 69 | mid = (ip[i] + ip[i+1])/2; |
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| 70 | side = (ip[i] - ip[i+1])/2; |
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| 71 | op[i ] = mid; |
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| 72 | op[i+1] = side; |
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| 73 | } |
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| 74 | |
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| 75 | return 0; |
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[1627] | 76 | } |
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| 77 | |
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| 78 | int roar_conv_ms2s_8 (void * out, void * in, int samples) { |
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[1628] | 79 | char * ip = in; |
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| 80 | char * op = out; |
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| 81 | register int i; |
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| 82 | register char mid; |
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| 83 | register char side; |
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| 84 | |
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| 85 | for (i = 0; i < samples; i += 2) { |
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| 86 | mid = ip[i]; |
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| 87 | side = ip[i+1]; |
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| 88 | op[i ] = mid + side; |
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| 89 | op[i+1] = mid - side; |
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| 90 | } |
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| 91 | |
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| 92 | return 0; |
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[1627] | 93 | } |
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| 94 | |
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| 95 | int roar_conv_ms2s_16 (void * out, void * in, int samples) { |
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[1628] | 96 | int16_t * ip = in; |
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| 97 | int16_t * op = out; |
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| 98 | register int i; |
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| 99 | register int16_t mid; |
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| 100 | register int16_t side; |
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| 101 | |
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| 102 | for (i = 0; i < samples; i += 2) { |
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| 103 | mid = ip[i]; |
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| 104 | side = ip[i+1]; |
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| 105 | op[i ] = mid + side; |
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| 106 | op[i+1] = mid - side; |
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| 107 | } |
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| 108 | |
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| 109 | return 0; |
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[1627] | 110 | } |
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| 111 | |
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| 112 | int roar_conv_ms2s_32 (void * out, void * in, int samples) { |
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[1628] | 113 | int32_t * ip = in; |
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| 114 | int32_t * op = out; |
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| 115 | register int i; |
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| 116 | register int32_t mid; |
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| 117 | register int32_t side; |
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| 118 | |
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| 119 | for (i = 0; i < samples; i += 2) { |
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| 120 | mid = ip[i]; |
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| 121 | side = ip[i+1]; |
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| 122 | op[i ] = mid + side; |
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| 123 | op[i+1] = mid - side; |
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| 124 | } |
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| 125 | |
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| 126 | return 0; |
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[1627] | 127 | } |
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| 128 | |
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[1626] | 129 | |
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| 130 | //ll |
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