1 | /* -*- mode: C; tab-width:8; c-basic-offset:8 -*- |
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2 | * vi:set ts=8: |
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3 | * |
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4 | * al_mixmanager.c |
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5 | * |
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6 | * Definition and manipulated of ALMixManager objects. |
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7 | */ |
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8 | #include "al_siteconfig.h" |
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9 | |
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10 | #include <stdlib.h> |
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11 | #include <stdio.h> |
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12 | #include <string.h> |
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13 | |
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14 | #include "al_debug.h" |
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15 | #include "al_types.h" |
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16 | #include "al_mixmanager.h" |
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17 | |
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18 | #include "mixaudio16.h" |
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19 | |
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20 | /* |
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21 | * _alMixManagerInit( ALMixManager *mixman, ALuint size ) |
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22 | * |
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23 | * Initializes the already allocated ALMixManager object *mixman, to |
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24 | * accomodate at least size entries. |
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25 | */ |
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26 | ALboolean _alMixManagerInit( ALMixManager *mixman, ALuint size ) { |
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27 | void *temp; |
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28 | |
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29 | if(size == 0) { |
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30 | return AL_FALSE; |
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31 | } |
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32 | |
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33 | if(size > MAXMIXSOURCES) { |
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34 | return AL_FALSE; |
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35 | } |
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36 | |
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37 | mixman->size = size; |
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38 | mixman->index = 0; |
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39 | |
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40 | temp = realloc(mixman->pool, size * sizeof *mixman->pool); |
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41 | if(temp == NULL) { |
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42 | perror("malloc"); |
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43 | return AL_FALSE; |
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44 | } |
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45 | mixman->pool = temp; |
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46 | |
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47 | memset(mixman->pool, 0, size * sizeof *mixman->pool); |
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48 | |
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49 | return AL_TRUE; |
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50 | } |
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51 | |
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52 | /* |
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53 | * _alMixManagerDestroy( ALMixManager *mixman ) |
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54 | * |
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55 | * Performs finalization on the ALMixManager object *mixman. |
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56 | */ |
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57 | void _alMixManagerDestroy( ALMixManager *mixman ) { |
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58 | free( mixman->pool ); |
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59 | mixman->pool = NULL; |
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60 | |
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61 | mixman->index = 0; |
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62 | mixman->size = 0; |
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63 | |
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64 | /* let caller free mixman, if needed */ |
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65 | |
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66 | return; |
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67 | } |
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68 | |
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69 | |
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70 | /* |
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71 | * _alMixManagerAdd( ALMixManager *mixman, ALvoid *dataptr, int bytes_to_write ) |
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72 | * |
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73 | * Adds an entry to the ALMixManager object *mixman, with data dataptr of |
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74 | * length bytes_to_write in bytes. |
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75 | * |
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76 | * assumes locked mixer |
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77 | * |
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78 | * FIXME: sort by bytes? |
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79 | */ |
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80 | void _alMixManagerAdd( ALMixManager *mixman, void *dataptr, int bytes_to_write ) { |
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81 | void *temp; |
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82 | |
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83 | if(mixman->index >= mixman->size) { |
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84 | /* time to resize */ |
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85 | int newsize = mixman->size * 2; |
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86 | |
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87 | temp = realloc(mixman->pool, newsize * sizeof *mixman->pool); |
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88 | if(temp == NULL) { |
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89 | /* oh dear */ |
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90 | return; |
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91 | } |
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92 | |
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93 | mixman->pool = temp; |
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94 | mixman->size = newsize; |
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95 | } |
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96 | |
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97 | mixman->pool[mixman->index].data = dataptr; |
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98 | mixman->pool[mixman->index].bytes = bytes_to_write; |
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99 | |
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100 | mixman->index++; |
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101 | |
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102 | return; |
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103 | } |
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104 | |
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105 | |
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106 | /* |
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107 | * _alMixManagerMix( ALMixManager *mixman, ALMixFunc *mf, ALvoid *dataptr ) |
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108 | * |
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109 | * Mixes each entry in ALMixManager *mixman, using mixing functions from |
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110 | * ALMixFunc, populating dataptr. |
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111 | * |
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112 | * assumes locked mixer |
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113 | */ |
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114 | void _alMixManagerMix( ALMixManager *mixman, ALMixFunc *mf, ALvoid *dataptr ) { |
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115 | if( mixman == NULL ) { |
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116 | return; |
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117 | } |
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118 | |
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119 | if( mf == NULL ) { |
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120 | return; |
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121 | } |
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122 | |
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123 | if(mixman->index > mf->max) { |
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124 | /* bite the bullet and do it the long way */ |
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125 | mf->func_n(dataptr, mixman->pool, mixman->index); |
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126 | } else { |
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127 | /* do the mixing */ |
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128 | mf->funcs[mixman->index](dataptr, mixman->pool); |
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129 | } |
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130 | |
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131 | while(mixman->index--) { |
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132 | mixman->pool[mixman->index].data = NULL; |
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133 | } |
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134 | |
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135 | /* reset index */ |
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136 | mixman->index = 0; |
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137 | |
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138 | return; |
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139 | } |
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