[3034] | 1 | //interleave.c: |
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| 2 | |
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| 3 | /* |
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[5381] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2012 |
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[3034] | 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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[3517] | 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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[3034] | 23 | * |
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| 24 | */ |
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| 25 | |
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| 26 | #include "libroardsp.h" |
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| 27 | |
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| 28 | int roar_interl_init (struct roar_interleave * state, size_t channels, size_t bits) { |
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[5270] | 29 | if ( state == NULL ) { |
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| 30 | roar_err_set(ROAR_ERROR_FAULT); |
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[3034] | 31 | return -1; |
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[5270] | 32 | } |
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[3034] | 33 | |
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| 34 | // we can currently only hanle full bytes: |
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| 35 | if ( bits % 8 ) |
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| 36 | return -1; |
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| 37 | |
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| 38 | // currently we have a channel limit |
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[5270] | 39 | if ( channels > ROAR_INTERLEAVE_MAX_CHANNELS ) { |
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| 40 | roar_err_set(ROAR_ERROR_RANGE); |
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[3034] | 41 | return -1; |
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[5270] | 42 | } |
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[3034] | 43 | |
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| 44 | memset(state, 0, sizeof(struct roar_interleave)); |
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| 45 | |
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| 46 | state->channels = channels; |
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| 47 | state->bits = bits; |
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| 48 | |
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| 49 | return 0; |
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| 50 | } |
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| 51 | |
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| 52 | int roar_interl_uninit(struct roar_interleave * state) { |
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[5270] | 53 | if ( state == NULL ) { |
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| 54 | roar_err_set(ROAR_ERROR_FAULT); |
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[3034] | 55 | return -1; |
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[5270] | 56 | } |
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[3034] | 57 | |
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| 58 | memset(state, 0, sizeof(struct roar_interleave)); |
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| 59 | |
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| 60 | return 0; |
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| 61 | } |
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| 62 | |
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| 63 | int roar_interl_ctl (struct roar_interleave * state, int cmd, void * data) { |
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[5270] | 64 | if ( state == NULL ) { |
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| 65 | roar_err_set(ROAR_ERROR_FAULT); |
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[3034] | 66 | return -1; |
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[5270] | 67 | } |
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[3034] | 68 | |
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[5270] | 69 | (void)state, (void)cmd, (void)data; |
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| 70 | |
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| 71 | roar_err_set(ROAR_ERROR_NOSYS); |
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[3034] | 72 | return -1; |
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| 73 | } |
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| 74 | |
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[3036] | 75 | int roar_interl_encode_ext(struct roar_interleave * state, void ** in, void * out, size_t len) { |
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[3037] | 76 | size_t chan = 0; |
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| 77 | size_t oc; |
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| 78 | size_t bc = 0; // bit counter |
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| 79 | char * ip[ROAR_INTERLEAVE_MAX_CHANNELS]; // output pointer |
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| 80 | |
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[5270] | 81 | if ( state == NULL ) { |
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| 82 | roar_err_set(ROAR_ERROR_FAULT); |
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[3036] | 83 | return -1; |
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[5270] | 84 | } |
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[3036] | 85 | |
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[5270] | 86 | if ( in == NULL || out == NULL ) { |
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| 87 | roar_err_set(ROAR_ERROR_FAULT); |
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[3037] | 88 | return -1; |
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[5270] | 89 | } |
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[3037] | 90 | |
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| 91 | if ( len == 0 ) |
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| 92 | return 0; |
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| 93 | |
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| 94 | memcpy(ip, in, sizeof(void*)*state->channels); |
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| 95 | |
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| 96 | for (oc = 0; oc < len; oc++) { |
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| 97 | ((char*)out)[oc] = *(ip[chan]); |
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| 98 | ip[chan]++; |
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| 99 | |
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| 100 | bc += 8; |
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| 101 | |
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| 102 | if ( bc == state->bits ) { |
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| 103 | bc = 0; |
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| 104 | chan++; |
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| 105 | if ( chan == state->channels ) |
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| 106 | chan = 0; |
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| 107 | } |
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| 108 | } |
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| 109 | |
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[3036] | 110 | return -1; |
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| 111 | } |
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| 112 | |
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[3035] | 113 | int roar_interl_decode_ext(struct roar_interleave * state, void * in, void ** out, size_t len) { |
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[3034] | 114 | size_t chan = 0; |
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| 115 | size_t ic; // input counter |
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| 116 | size_t bc = 0; // bit counter |
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| 117 | char * op[ROAR_INTERLEAVE_MAX_CHANNELS]; // output pointer |
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| 118 | |
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| 119 | if ( state == NULL ) |
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| 120 | return -1; |
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| 121 | |
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| 122 | if ( in == NULL || out == NULL ) |
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| 123 | return -1; |
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| 124 | |
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| 125 | if ( len == 0 ) |
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| 126 | return 0; |
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| 127 | |
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| 128 | memcpy(op, out, sizeof(void*)*state->channels); |
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| 129 | |
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| 130 | for (ic = 0; ic < len; ic++) { |
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| 131 | // get char and copy it |
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| 132 | *(op[chan]) = ((char*)in)[ic]; |
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| 133 | op[chan]++; |
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| 134 | |
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| 135 | bc += 8; |
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| 136 | |
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| 137 | if ( bc == state->bits ) { |
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| 138 | bc = 0; |
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| 139 | chan++; |
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| 140 | if ( chan == state->channels ) |
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| 141 | chan = 0; |
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| 142 | } |
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| 143 | } |
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| 144 | |
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| 145 | return -1; |
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| 146 | } |
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| 147 | |
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| 148 | //ll |
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