[3034] | 1 | //interleave.c: |
---|
| 2 | |
---|
| 3 | /* |
---|
[3811] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2010 |
---|
[3034] | 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 |
---|
[3517] | 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
---|
| 22 | * Boston, MA 02110-1301, USA. |
---|
[3034] | 23 | * |
---|
| 24 | */ |
---|
| 25 | |
---|
| 26 | #include "libroardsp.h" |
---|
| 27 | |
---|
| 28 | int roar_interl_init (struct roar_interleave * state, size_t channels, size_t bits) { |
---|
| 29 | if ( state == NULL ) |
---|
| 30 | return -1; |
---|
| 31 | |
---|
| 32 | // we can currently only hanle full bytes: |
---|
| 33 | if ( bits % 8 ) |
---|
| 34 | return -1; |
---|
| 35 | |
---|
| 36 | // currently we have a channel limit |
---|
| 37 | if ( channels > ROAR_INTERLEAVE_MAX_CHANNELS ) |
---|
| 38 | return -1; |
---|
| 39 | |
---|
| 40 | memset(state, 0, sizeof(struct roar_interleave)); |
---|
| 41 | |
---|
| 42 | state->channels = channels; |
---|
| 43 | state->bits = bits; |
---|
| 44 | |
---|
| 45 | return 0; |
---|
| 46 | } |
---|
| 47 | |
---|
| 48 | int roar_interl_uninit(struct roar_interleave * state) { |
---|
| 49 | if ( state == NULL ) |
---|
| 50 | return -1; |
---|
| 51 | |
---|
| 52 | memset(state, 0, sizeof(struct roar_interleave)); |
---|
| 53 | |
---|
| 54 | return 0; |
---|
| 55 | } |
---|
| 56 | |
---|
| 57 | int roar_interl_ctl (struct roar_interleave * state, int cmd, void * data) { |
---|
| 58 | if ( state == NULL ) |
---|
| 59 | return -1; |
---|
| 60 | |
---|
| 61 | return -1; |
---|
| 62 | } |
---|
| 63 | |
---|
[3036] | 64 | int roar_interl_encode_ext(struct roar_interleave * state, void ** in, void * out, size_t len) { |
---|
[3037] | 65 | size_t chan = 0; |
---|
| 66 | size_t oc; |
---|
| 67 | size_t bc = 0; // bit counter |
---|
| 68 | char * ip[ROAR_INTERLEAVE_MAX_CHANNELS]; // output pointer |
---|
| 69 | |
---|
[3036] | 70 | if ( state == NULL ) |
---|
| 71 | return -1; |
---|
| 72 | |
---|
[3037] | 73 | if ( in == NULL || out == NULL ) |
---|
| 74 | return -1; |
---|
| 75 | |
---|
| 76 | if ( len == 0 ) |
---|
| 77 | return 0; |
---|
| 78 | |
---|
| 79 | memcpy(ip, in, sizeof(void*)*state->channels); |
---|
| 80 | |
---|
| 81 | for (oc = 0; oc < len; oc++) { |
---|
| 82 | ((char*)out)[oc] = *(ip[chan]); |
---|
| 83 | ip[chan]++; |
---|
| 84 | |
---|
| 85 | bc += 8; |
---|
| 86 | |
---|
| 87 | if ( bc == state->bits ) { |
---|
| 88 | bc = 0; |
---|
| 89 | chan++; |
---|
| 90 | if ( chan == state->channels ) |
---|
| 91 | chan = 0; |
---|
| 92 | } |
---|
| 93 | } |
---|
| 94 | |
---|
[3036] | 95 | return -1; |
---|
| 96 | } |
---|
| 97 | |
---|
[3035] | 98 | int roar_interl_decode_ext(struct roar_interleave * state, void * in, void ** out, size_t len) { |
---|
[3034] | 99 | size_t chan = 0; |
---|
| 100 | size_t ic; // input counter |
---|
| 101 | size_t bc = 0; // bit counter |
---|
| 102 | char * op[ROAR_INTERLEAVE_MAX_CHANNELS]; // output pointer |
---|
| 103 | |
---|
| 104 | if ( state == NULL ) |
---|
| 105 | return -1; |
---|
| 106 | |
---|
| 107 | if ( in == NULL || out == NULL ) |
---|
| 108 | return -1; |
---|
| 109 | |
---|
| 110 | if ( len == 0 ) |
---|
| 111 | return 0; |
---|
| 112 | |
---|
| 113 | memcpy(op, out, sizeof(void*)*state->channels); |
---|
| 114 | |
---|
| 115 | for (ic = 0; ic < len; ic++) { |
---|
| 116 | // get char and copy it |
---|
| 117 | *(op[chan]) = ((char*)in)[ic]; |
---|
| 118 | op[chan]++; |
---|
| 119 | |
---|
| 120 | bc += 8; |
---|
| 121 | |
---|
| 122 | if ( bc == state->bits ) { |
---|
| 123 | bc = 0; |
---|
| 124 | chan++; |
---|
| 125 | if ( chan == state->channels ) |
---|
| 126 | chan = 0; |
---|
| 127 | } |
---|
| 128 | } |
---|
| 129 | |
---|
| 130 | return -1; |
---|
| 131 | } |
---|
| 132 | |
---|
| 133 | //ll |
---|