| 1 | //interleave.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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| 27 | int roar_interl_init (struct roar_interleave * state, size_t channels, size_t bits) { |
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| 28 | if ( state == NULL ) |
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| 29 | return -1; |
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| 30 | |
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| 31 | // we can currently only hanle full bytes: |
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| 32 | if ( bits % 8 ) |
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| 33 | return -1; |
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| 34 | |
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| 35 | // currently we have a channel limit |
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| 36 | if ( channels > ROAR_INTERLEAVE_MAX_CHANNELS ) |
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| 37 | return -1; |
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| 38 | |
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| 39 | memset(state, 0, sizeof(struct roar_interleave)); |
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| 40 | |
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| 41 | state->channels = channels; |
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| 42 | state->bits = bits; |
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| 43 | |
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| 44 | return 0; |
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| 45 | } |
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| 46 | |
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| 47 | int roar_interl_uninit(struct roar_interleave * state) { |
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| 48 | if ( state == NULL ) |
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| 49 | return -1; |
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| 50 | |
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| 51 | memset(state, 0, sizeof(struct roar_interleave)); |
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| 52 | |
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| 53 | return 0; |
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| 54 | } |
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| 55 | |
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| 56 | int roar_interl_ctl (struct roar_interleave * state, int cmd, void * data) { |
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| 57 | if ( state == NULL ) |
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| 58 | return -1; |
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| 59 | |
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| 60 | return -1; |
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| 61 | } |
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| 62 | |
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| 63 | int roar_interl_decode_ext(struct roar_interleave * state, void * in, void ** out, size_t len) { |
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| 64 | size_t chan = 0; |
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| 65 | size_t ic; // input counter |
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| 66 | size_t bc = 0; // bit counter |
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| 67 | char * op[ROAR_INTERLEAVE_MAX_CHANNELS]; // output pointer |
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| 68 | |
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| 69 | if ( state == NULL ) |
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| 70 | return -1; |
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| 71 | |
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| 72 | if ( in == NULL || out == NULL ) |
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| 73 | return -1; |
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| 74 | |
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| 75 | if ( len == 0 ) |
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| 76 | return 0; |
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| 77 | |
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| 78 | memcpy(op, out, sizeof(void*)*state->channels); |
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| 79 | |
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| 80 | for (ic = 0; ic < len; ic++) { |
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| 81 | // get char and copy it |
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| 82 | *(op[chan]) = ((char*)in)[ic]; |
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| 83 | op[chan]++; |
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| 84 | |
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| 85 | bc += 8; |
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| 86 | |
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| 87 | if ( bc == state->bits ) { |
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| 88 | bc = 0; |
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| 89 | chan++; |
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| 90 | if ( chan == state->channels ) |
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| 91 | chan = 0; |
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| 92 | } |
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| 93 | } |
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| 94 | |
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| 95 | return -1; |
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| 96 | } |
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| 97 | |
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| 98 | //ll |
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