1 | //mixer.c: |
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2 | |
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3 | #include "roard.h" |
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4 | |
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5 | int mix_clients (void * output, int bits, void ** input, int samples) { |
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6 | if ( bits == 8 ) { |
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7 | return mix_clients_8bit(output, input, samples); |
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8 | } else if ( bits == 16 ) { |
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9 | return mix_clients_16bit(output, input, samples); |
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10 | } else if ( bits == 24 ) { |
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11 | return mix_clients_24bit(output, input, samples); |
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12 | } else if ( bits == 32 ) { |
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13 | return mix_clients_32bit(output, input, samples); |
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14 | } else { |
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15 | return -1; |
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16 | } |
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17 | } |
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18 | |
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19 | int mix_clients_8bit (void * output, void ** input, int samples) { |
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20 | int i, s; |
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21 | int c; |
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22 | |
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23 | for (s = 0; s < samples; s++) { |
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24 | c = 0; |
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25 | |
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26 | for (i = 0; input[i] != NULL; i++) |
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27 | c += ((char**)input)[i][s]; |
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28 | |
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29 | if ( c > 127 ) |
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30 | c = 127; |
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31 | else if ( c < -128 ) |
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32 | c = -128; |
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33 | ((char*)output)[s] = (char)c; |
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34 | } |
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35 | |
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36 | return 0; |
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37 | } |
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38 | |
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39 | int mix_clients_16bit (void * output, void ** input, int samples) { |
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40 | int i, s; |
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41 | int c; |
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42 | int16_t ** in = (int16_t**) input; |
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43 | int16_t * out = output; |
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44 | |
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45 | #ifdef DEBUG |
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46 | for (i = 0; input[i] != NULL; i++) |
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47 | ROAR_DBG("mix_clients_16bit(*): input[%i] = %p", i, input[i]); |
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48 | #endif |
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49 | |
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50 | /* |
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51 | if ( input[0] != NULL ) |
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52 | write(1, input[0], samples*2); |
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53 | */ |
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54 | |
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55 | /* |
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56 | if ( input[0] != NULL ) { |
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57 | memcpy(output, input[0], samples*2); |
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58 | return -1; |
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59 | } |
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60 | */ |
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61 | |
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62 | for (s = 0; s < samples; s++) { |
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63 | c = 0; |
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64 | for (i = 0; input[i] != NULL; i++) |
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65 | c += in[i][s]; |
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66 | |
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67 | if ( c > 32767 ) |
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68 | c = 32767; |
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69 | else if ( c < -32768 ) |
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70 | c = -32768; |
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71 | |
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72 | out[s] = c; |
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73 | } |
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74 | |
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75 | return 0; |
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76 | } |
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77 | |
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78 | int mix_clients_24bit (void * output, void ** input, int samples) { |
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79 | return -1; |
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80 | } |
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81 | |
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82 | int mix_clients_32bit (void * output, void ** input, int samples) { |
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83 | /* |
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84 | int i, s; |
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85 | int c; |
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86 | |
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87 | for (s = 0; s < samples; s++) { |
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88 | c = 0; |
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89 | |
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90 | for (i = 0; input[i]; i++) |
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91 | c += ((int**)input)[i][s]; |
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92 | |
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93 | if ( c > 127 ) |
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94 | c = 127; |
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95 | else if ( c < -128 ) |
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96 | c = -128; |
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97 | ((int*)output)[s] = (char)c; |
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98 | } |
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99 | |
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100 | return 0; |
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101 | */ |
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102 | return 1; |
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103 | } |
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104 | |
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105 | int change_vol (void * output, int bits, void * input, int samples, int channels, struct roar_mixer_settings * set) { |
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106 | |
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107 | ROAR_DBG("change_vol(*): mixer at %p", set->mixer); |
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108 | |
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109 | if ( bits == 8 ) { |
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110 | return change_vol_8bit(output, input, samples, channels, set); |
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111 | } else if ( bits == 16 ) { |
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112 | return change_vol_16bit(output, input, samples, channels, set); |
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113 | } else if ( bits == 24 ) { |
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114 | return change_vol_24bit(output, input, samples, channels, set); |
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115 | } else if ( bits == 32 ) { |
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116 | return change_vol_32bit(output, input, samples, channels, set); |
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117 | } else { |
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118 | return -1; |
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119 | } |
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120 | } |
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121 | |
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122 | int change_vol_8bit (void * output, void * input, int samples, int channels, struct roar_mixer_settings * set) { |
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123 | char * in = input, * out = output; |
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124 | int i; |
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125 | int s; |
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126 | |
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127 | if ( !(in && out) ) |
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128 | return -1; |
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129 | |
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130 | for (i = 0; i < samples; i++) { |
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131 | s = in[i]; |
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132 | s *= set->mixer[i % channels]; |
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133 | s /= set->scale; |
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134 | out[i] = s; |
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135 | } |
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136 | |
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137 | return 0; |
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138 | } |
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139 | |
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140 | int change_vol_16bit (void * output, void * input, int samples, int channels, struct roar_mixer_settings * set) { |
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141 | int16_t * in = input, * out = output; |
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142 | int i; |
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143 | int s; |
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144 | |
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145 | if ( !(in && out) ) |
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146 | return -1; |
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147 | |
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148 | for (i = 0; i < samples; i++) { |
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149 | s = in[i]; |
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150 | s *= set->mixer[i % channels]; |
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151 | s /= set->scale; |
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152 | out[i] = s; |
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153 | } |
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154 | |
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155 | return 0; |
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156 | } |
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157 | |
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158 | int change_vol_24bit (void * output, void * input, int samples, int channels, struct roar_mixer_settings * set) { |
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159 | return -1; |
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160 | } |
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161 | |
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162 | int change_vol_32bit (void * output, void * input, int samples, int channels, struct roar_mixer_settings * set) { |
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163 | return -1; |
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164 | } |
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165 | |
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166 | |
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167 | //ll |
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