Mercurial > sdl-ios-xcode
annotate docs/html/sdlmixaudio.html @ 641:df178851293b
Date: 28 Jun 2003 22:42:52 +0100
From: Alan Swanson
Subject: Re: [SDL] New XFree 4.3 Video Mode Patch
I have a wee amendment that moves the qsort in set_best_resolution
to only occur after failing to find an exact match only. This would
make absolutely sure we get a user set mode.
While I've never had any problems for my normal resolutions (1280x1024,
1024x768, 800x600 & 640,480) while closely examining the output from
qsort I've noticed it doesn't seem to sort the modes fully. These is
one definite wrong at 1152x768 and a few that just look wrong to me.
From a program (attached) I made to examine this more easily. X has
sorted its mode list using the same method as ours (plus frequency),
and our user modes get inserted without any other movement.
On the patch I've made I've also changed cmpmodes to sort on vertical
resolution and then horizontal. Ie vertical is now most significant
bit.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 28 Jun 2003 21:52:26 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 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 > |