Mercurial > sdl-ios-xcode
annotate docs/html/sdlmixaudio.html @ 392:71fe0b713085
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 04 Jun 2002 22:30:40 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_MixAudio</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Audio" | |
| 14 HREF="audio.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_ConvertAudio" | |
| 17 HREF="sdlconvertaudio.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_LockAudio" | |
| 20 HREF="sdllockaudio.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="REFENTRY" | |
| 23 BGCOLOR="#FFF8DC" | |
| 24 TEXT="#000000" | |
| 25 LINK="#0000ee" | |
| 26 VLINK="#551a8b" | |
| 27 ALINK="#ff0000" | |
| 28 ><DIV | |
| 29 CLASS="NAVHEADER" | |
| 30 ><TABLE | |
| 31 WIDTH="100%" | |
| 32 BORDER="0" | |
| 33 CELLPADDING="0" | |
| 34 CELLSPACING="0" | |
| 35 ><TR | |
| 36 ><TH | |
| 37 COLSPAN="3" | |
| 38 ALIGN="center" | |
| 39 >SDL Library Documentation</TH | |
| 40 ></TR | |
| 41 ><TR | |
| 42 ><TD | |
| 43 WIDTH="10%" | |
| 44 ALIGN="left" | |
| 45 VALIGN="bottom" | |
| 46 ><A | |
| 47 HREF="sdlconvertaudio.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 ></TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="sdllockaudio.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><H1 | |
| 69 ><A | |
| 70 NAME="SDLMIXAUDIO" | |
| 71 >SDL_MixAudio</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
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76 NAME="AEN6719" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_MixAudio -- Mix audio data</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
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84 NAME="AEN6722" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN6723" |
| 0 | 92 ></A |
| 93 ><P | |
| 94 ></P | |
| 95 ><PRE | |
| 96 CLASS="FUNCSYNOPSISINFO" | |
| 97 >#include "SDL.h"</PRE | |
| 98 ><P | |
| 99 ><CODE | |
| 100 ><CODE | |
| 101 CLASS="FUNCDEF" | |
| 102 >void <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_MixAudio</B | |
| 105 ></CODE | |
| 106 >(Uint8 *dst, Uint8 *src, Uint32 len, int volume);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
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115 NAME="AEN6729" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
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120 >This function takes two audio buffers of <TT |
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121 CLASS="PARAMETER" |
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122 ><I |
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123 >len</I |
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124 ></TT |
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125 > bytes each |
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126 of the playing audio format and mixes them, performing addition, volume |
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127 adjustment, and overflow clipping. The <TT |
| 0 | 128 CLASS="PARAMETER" |
| 129 ><I | |
| 130 >volume</I | |
| 131 ></TT | |
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132 > ranges |
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133 from 0 to <TT |
| 0 | 134 CLASS="LITERAL" |
| 135 >SDL_MIX_MAXVOLUME</TT | |
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136 > and should be set to the maximum |
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137 value for full audio volume. Note this does not change hardware volume. This is |
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138 provided for convenience -- you can mix your own audio data.</P |
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139 ><DIV |
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140 CLASS="NOTE" |
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141 ><BLOCKQUOTE |
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142 CLASS="NOTE" |
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143 ><P |
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144 ><B |
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145 >Note: </B |
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146 >Do not use this function for mixing together more than two streams of sample |
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147 data. The output from repeated application of this function may be distorted |
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148 by clipping, because there is no accumulator with greater range than the |
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149 input (not to mention this being an inefficient way of doing it). |
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150 Use mixing functions from SDL_mixer, OpenAL, or write your own mixer instead.</P |
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151 ></BLOCKQUOTE |
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152 ></DIV |
| 0 | 153 ></DIV |
| 154 ><DIV | |
| 155 CLASS="REFSECT1" | |
| 156 ><A | |
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157 NAME="AEN6737" |
| 0 | 158 ></A |
| 159 ><H2 | |
| 160 >See Also</H2 | |
| 161 ><P | |
| 162 ><A | |
| 163 HREF="sdlopenaudio.html" | |
| 164 ><TT | |
| 165 CLASS="FUNCTION" | |
| 166 >SDL_OpenAudio</TT | |
| 167 ></A | |
| 168 ></P | |
| 169 ></DIV | |
| 170 ><DIV | |
| 171 CLASS="NAVFOOTER" | |
| 172 ><HR | |
| 173 ALIGN="LEFT" | |
| 174 WIDTH="100%"><TABLE | |
| 175 WIDTH="100%" | |
| 176 BORDER="0" | |
| 177 CELLPADDING="0" | |
| 178 CELLSPACING="0" | |
| 179 ><TR | |
| 180 ><TD | |
| 181 WIDTH="33%" | |
| 182 ALIGN="left" | |
| 183 VALIGN="top" | |
| 184 ><A | |
| 185 HREF="sdlconvertaudio.html" | |
| 186 >Prev</A | |
| 187 ></TD | |
| 188 ><TD | |
| 189 WIDTH="34%" | |
| 190 ALIGN="center" | |
| 191 VALIGN="top" | |
| 192 ><A | |
| 193 HREF="index.html" | |
| 194 >Home</A | |
| 195 ></TD | |
| 196 ><TD | |
| 197 WIDTH="33%" | |
| 198 ALIGN="right" | |
| 199 VALIGN="top" | |
| 200 ><A | |
| 201 HREF="sdllockaudio.html" | |
| 202 >Next</A | |
| 203 ></TD | |
| 204 ></TR | |
| 205 ><TR | |
| 206 ><TD | |
| 207 WIDTH="33%" | |
| 208 ALIGN="left" | |
| 209 VALIGN="top" | |
| 210 >SDL_ConvertAudio</TD | |
| 211 ><TD | |
| 212 WIDTH="34%" | |
| 213 ALIGN="center" | |
| 214 VALIGN="top" | |
| 215 ><A | |
| 216 HREF="audio.html" | |
| 217 >Up</A | |
| 218 ></TD | |
| 219 ><TD | |
| 220 WIDTH="33%" | |
| 221 ALIGN="right" | |
| 222 VALIGN="top" | |
| 223 >SDL_LockAudio</TD | |
| 224 ></TR | |
| 225 ></TABLE | |
| 226 ></DIV | |
| 227 ></BODY | |
| 228 ></HTML | |
| 229 > |