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4 >SDL_MixAudio</TITLE |
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71 ><H1 |
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72 ><A |
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73 NAME="SDLMIXAUDIO" |
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74 ></A |
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75 >SDL_MixAudio</H1 |
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76 ><DIV |
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77 CLASS="REFNAMEDIV" |
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78 ><A |
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79 NAME="AEN7107" |
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80 ></A |
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81 ><H2 |
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82 >Name</H2 |
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83 >SDL_MixAudio -- Mix audio data</DIV |
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85 CLASS="REFSYNOPSISDIV" |
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87 NAME="AEN7110" |
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88 ></A |
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90 >Synopsis</H2 |
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94 NAME="AEN7111" |
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95 ></A |
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96 ><P |
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97 ></P |
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98 ><PRE |
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99 CLASS="FUNCSYNOPSISINFO" |
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100 >#include "SDL.h"</PRE |
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101 ><P |
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102 ><CODE |
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103 ><CODE |
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104 CLASS="FUNCDEF" |
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105 >void <B |
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106 CLASS="FSFUNC" |
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107 >SDL_MixAudio</B |
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108 ></CODE |
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109 >(Uint8 *dst, Uint8 *src, Uint32 len, int volume);</CODE |
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110 ></P |
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111 ><P |
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118 NAME="AEN7117" |
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120 ><H2 |
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121 >Description</H2 |
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122 ><P |
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123 >This function takes two audio buffers of <TT |
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124 CLASS="PARAMETER" |
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125 ><I |
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126 >len</I |
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127 ></TT |
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128 > bytes each |
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129 of the playing audio format and mixes them, performing addition, volume |
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130 adjustment, and overflow clipping. The <TT |
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131 CLASS="PARAMETER" |
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132 ><I |
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133 >volume</I |
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134 ></TT |
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135 > ranges |
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136 from 0 to <TT |
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137 CLASS="LITERAL" |
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138 >SDL_MIX_MAXVOLUME</TT |
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139 > and should be set to the maximum |
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140 value for full audio volume. Note this does not change hardware volume. This is |
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141 provided for convenience -- you can mix your own audio data.</P |
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142 ><DIV |
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143 CLASS="NOTE" |
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144 ><BLOCKQUOTE |
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145 CLASS="NOTE" |
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146 ><P |
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147 ><B |
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148 >Note: </B |
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149 >Do not use this function for mixing together more than two streams of sample |
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150 data. The output from repeated application of this function may be distorted |
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151 by clipping, because there is no accumulator with greater range than the |
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152 input (not to mention this being an inefficient way of doing it). |
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153 Use mixing functions from SDL_mixer, OpenAL, or write your own mixer instead.</P |
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154 ></BLOCKQUOTE |
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160 NAME="AEN7125" |
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161 ></A |
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162 ><H2 |
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163 >See Also</H2 |
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164 ><P |
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165 ><A |
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166 HREF="sdlopenaudio.html" |
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167 ><TT |
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168 CLASS="FUNCTION" |
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169 >SDL_OpenAudio</TT |
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170 ></A |
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