1 | //dmx-random.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2011-2013 |
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5 | * |
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6 | * This file is part of roard 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 | * RoarAudio 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 <roard/include/roard.h> |
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27 | |
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28 | #define SAMPLES_PER_TICK 2 |
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29 | |
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30 | struct channel { |
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31 | int32_t endsamp; |
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32 | int32_t cursamp; |
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33 | unsigned char startval, endval; |
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34 | }; |
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35 | |
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36 | struct state { |
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37 | size_t startaddr; |
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38 | size_t len; |
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39 | struct channel * channels; |
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40 | }; |
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41 | |
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42 | static struct state * g_state; |
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43 | static struct state g_state_init = { |
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44 | .startaddr = 0, |
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45 | .len = 4, |
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46 | .channels = NULL |
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47 | }; |
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48 | |
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49 | |
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50 | static void calc_end(size_t index) { |
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51 | if ( g_state->channels[index].cursamp <= g_state->channels[index].endsamp ) |
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52 | return; |
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53 | |
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54 | g_state->channels[index].cursamp = 0; |
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55 | g_state->channels[index].endsamp = (int32_t)1 + (int32_t)roar_random_uint16() * (int32_t)SAMPLES_PER_TICK; |
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56 | |
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57 | g_state->channels[index].startval = g_state->channels[index].endval; |
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58 | |
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59 | if ( roar_random_uint16() < 32768 ) |
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60 | return; |
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61 | |
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62 | g_state->channels[index].endval = roar_random_uint16() & 0xE0; |
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63 | } |
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64 | |
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65 | static void calc_channel(size_t index) { |
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66 | // trel = cursamp/endsamp |
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67 | double trel = (double)g_state->channels[index].cursamp/(double)g_state->channels[index].endsamp; |
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68 | double valdiff = (double)(g_state->channels[index].endval - g_state->channels[index].startval)*trel; |
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69 | valdiff += (double)g_state->channels[index].startval; |
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70 | light_dmxchannel_set(g_state->startaddr + index, (unsigned char)(unsigned int)(int)valdiff); |
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71 | } |
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72 | |
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73 | static int _init (struct roar_dl_librarypara * para) { |
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74 | struct roar_keyval * p; |
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75 | |
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76 | p = roar_keyval_lookup(para->argv, "startaddr", para->argc, 1); |
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77 | if ( p != NULL && p->value != NULL ) |
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78 | g_state->startaddr = atoi(p->value); |
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79 | |
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80 | p = roar_keyval_lookup(para->argv, "len", para->argc, 1); |
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81 | if ( p != NULL && p->value != NULL ) |
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82 | g_state->len = atoi(p->value); |
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83 | |
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84 | g_state->channels = roar_mm_malloc(g_state->len*sizeof(struct channel)); |
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85 | if ( g_state->channels == NULL ) |
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86 | return -1; |
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87 | |
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88 | memset(g_state->channels, 0, g_state->len*sizeof(struct channel)); |
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89 | |
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90 | return 0; |
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91 | } |
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92 | |
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93 | static int _free (struct roar_dl_librarypara * para) { |
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94 | (void)para; |
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95 | |
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96 | if ( g_state->channels != NULL ) |
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97 | roar_mm_free(g_state->channels); |
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98 | g_state->channels = NULL; |
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99 | return 0; |
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100 | } |
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101 | |
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102 | static int _update (struct roar_dl_librarypara * para) { |
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103 | size_t i; |
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104 | |
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105 | (void)para; |
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106 | |
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107 | for (i = 0; i < g_state->len; i++) { |
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108 | calc_end(i); |
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109 | calc_channel(i); |
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110 | g_state->channels[i].cursamp += ROAR_OUTPUT_BUFFER_SAMPLES; |
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111 | } |
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112 | |
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113 | return 0; |
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114 | } |
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115 | |
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116 | static struct roar_dl_appsched sched = { |
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117 | .init = _init, |
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118 | .free = _free, |
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119 | .update = _update, |
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120 | .tick = NULL, |
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121 | .wait = NULL |
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122 | }; |
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123 | |
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124 | ROAR_DL_PLUGIN_START(dmx_random) { |
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125 | ROARD_DL_CHECK_VERSIONS(); |
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126 | |
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127 | ROAR_DL_PLUGIN_META_PRODUCT_NIV("dmx-random", ROAR_VID_ROARAUDIO, ROAR_VNAME_ROARAUDIO); |
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128 | ROAR_DL_PLUGIN_META_VERSION(ROAR_VERSION_STRING); |
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129 | ROAR_DL_PLUGIN_META_LICENSE_TAG(GPLv3_0); |
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130 | ROAR_DL_PLUGIN_META_CONTACT_FLNE("Philipp", "Schafft", "ph3-der-loewe", "lion@lion.leolix.org"); |
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131 | ROAR_DL_PLUGIN_META_DESC("This generates random light effects using roard's DMX interface."); |
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132 | |
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133 | ROAR_DL_PLUGIN_REG_GLOBAL_DATA(g_state, g_state_init); |
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134 | ROAR_DL_PLUGIN_REG_APPSCHED(&sched); |
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135 | } ROAR_DL_PLUGIN_END |
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136 | |
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137 | //ll |
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