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 - 2009-2010 |
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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, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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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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29 | if ( state == NULL ) |
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30 | return -1; |
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31 | |
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32 | // we can currently only hanle full bytes: |
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33 | if ( bits % 8 ) |
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34 | return -1; |
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35 | |
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36 | // currently we have a channel limit |
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37 | if ( channels > ROAR_INTERLEAVE_MAX_CHANNELS ) |
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38 | return -1; |
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39 | |
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40 | memset(state, 0, sizeof(struct roar_interleave)); |
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41 | |
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42 | state->channels = channels; |
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43 | state->bits = bits; |
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44 | |
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45 | return 0; |
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46 | } |
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47 | |
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48 | int roar_interl_uninit(struct roar_interleave * state) { |
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49 | if ( state == NULL ) |
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50 | return -1; |
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51 | |
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52 | memset(state, 0, sizeof(struct roar_interleave)); |
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53 | |
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54 | return 0; |
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55 | } |
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56 | |
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57 | int roar_interl_ctl (struct roar_interleave * state, int cmd, void * data) { |
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58 | if ( state == NULL ) |
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59 | return -1; |
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60 | |
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61 | return -1; |
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62 | } |
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63 | |
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64 | int roar_interl_encode_ext(struct roar_interleave * state, void ** in, void * out, size_t len) { |
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65 | size_t chan = 0; |
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66 | size_t oc; |
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67 | size_t bc = 0; // bit counter |
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68 | char * ip[ROAR_INTERLEAVE_MAX_CHANNELS]; // output pointer |
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69 | |
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70 | if ( state == NULL ) |
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71 | return -1; |
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72 | |
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73 | if ( in == NULL || out == NULL ) |
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74 | return -1; |
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75 | |
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76 | if ( len == 0 ) |
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77 | return 0; |
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78 | |
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79 | memcpy(ip, in, sizeof(void*)*state->channels); |
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80 | |
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81 | for (oc = 0; oc < len; oc++) { |
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82 | ((char*)out)[oc] = *(ip[chan]); |
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83 | ip[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 | int roar_interl_decode_ext(struct roar_interleave * state, void * in, void ** out, size_t len) { |
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99 | size_t chan = 0; |
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100 | size_t ic; // input counter |
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101 | size_t bc = 0; // bit counter |
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102 | char * op[ROAR_INTERLEAVE_MAX_CHANNELS]; // output pointer |
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103 | |
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104 | if ( state == NULL ) |
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105 | return -1; |
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106 | |
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107 | if ( in == NULL || out == NULL ) |
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108 | return -1; |
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109 | |
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110 | if ( len == 0 ) |
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111 | return 0; |
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112 | |
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113 | memcpy(op, out, sizeof(void*)*state->channels); |
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114 | |
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115 | for (ic = 0; ic < len; ic++) { |
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116 | // get char and copy it |
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117 | *(op[chan]) = ((char*)in)[ic]; |
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118 | op[chan]++; |
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119 | |
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120 | bc += 8; |
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121 | |
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122 | if ( bc == state->bits ) { |
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123 | bc = 0; |
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124 | chan++; |
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125 | if ( chan == state->channels ) |
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126 | chan = 0; |
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127 | } |
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128 | } |
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129 | |
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130 | return -1; |
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131 | } |
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132 | |
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133 | //ll |
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