Mercurial > sdl-ios-xcode
annotate docs/html/sdlcreatethread.html @ 2042:3908e1f808e1
Fixed bug #292
I might be on crack here.
It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and
right channels of a stereo stream together, and clamps the new mono channel if
it would overflow.
Shouldn't it be dividing by 2 to average the two sample points instead of
clamping? Otherwise the mono sample point's volume doubles in the conversion.
This would also make the conversion faster, as it replaces two branches per
sample frame with a bitwise shift.
--ryan.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 24 Sep 2006 15:56:36 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_CreateThread</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Multi-threaded Programming" | |
| 14 HREF="thread.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="Multi-threaded Programming" | |
| 17 HREF="thread.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_ThreadID" | |
| 20 HREF="sdlthreadid.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 | |
|
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31 SUMMARY="Header navigation table" |
| 0 | 32 WIDTH="100%" |
| 33 BORDER="0" | |
| 34 CELLPADDING="0" | |
| 35 CELLSPACING="0" | |
| 36 ><TR | |
| 37 ><TH | |
| 38 COLSPAN="3" | |
| 39 ALIGN="center" | |
| 40 >SDL Library Documentation</TH | |
| 41 ></TR | |
| 42 ><TR | |
| 43 ><TD | |
| 44 WIDTH="10%" | |
| 45 ALIGN="left" | |
| 46 VALIGN="bottom" | |
| 47 ><A | |
| 48 HREF="thread.html" | |
|
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49 ACCESSKEY="P" |
| 0 | 50 >Prev</A |
| 51 ></TD | |
| 52 ><TD | |
| 53 WIDTH="80%" | |
| 54 ALIGN="center" | |
| 55 VALIGN="bottom" | |
| 56 ></TD | |
| 57 ><TD | |
| 58 WIDTH="10%" | |
| 59 ALIGN="right" | |
| 60 VALIGN="bottom" | |
| 61 ><A | |
| 62 HREF="sdlthreadid.html" | |
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63 ACCESSKEY="N" |
| 0 | 64 >Next</A |
| 65 ></TD | |
| 66 ></TR | |
| 67 ></TABLE | |
| 68 ><HR | |
| 69 ALIGN="LEFT" | |
| 70 WIDTH="100%"></DIV | |
| 71 ><H1 | |
| 72 ><A | |
| 73 NAME="SDLCREATETHREAD" | |
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74 ></A |
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75 >SDL_CreateThread</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN7701" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_CreateThread -- Creates a new thread of execution that shares its parent's properties.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN7704" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN7705" |
| 0 | 95 ></A |
| 96 ><P | |
| 97 ></P | |
| 98 ><PRE | |
| 99 CLASS="FUNCSYNOPSISINFO" | |
| 100 >#include "SDL.h" | |
| 101 #include "SDL_thread.h"</PRE | |
| 102 ><P | |
| 103 ><CODE | |
| 104 ><CODE | |
| 105 CLASS="FUNCDEF" | |
| 106 >SDL_Thread *<B | |
| 107 CLASS="FSFUNC" | |
| 108 >SDL_CreateThread</B | |
| 109 ></CODE | |
| 110 >(int (*fn)(void *), void *data);</CODE | |
| 111 ></P | |
| 112 ><P | |
| 113 ></P | |
| 114 ></DIV | |
| 115 ></DIV | |
| 116 ><DIV | |
| 117 CLASS="REFSECT1" | |
| 118 ><A | |
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119 NAME="AEN7711" |
| 0 | 120 ></A |
| 121 ><H2 | |
| 122 >Description</H2 | |
| 123 ><P | |
| 124 ><TT | |
| 125 CLASS="FUNCTION" | |
| 126 >SDL_CreateThread</TT | |
| 127 > creates a new thread of execution | |
| 128 that shares all of its parent's global memory, signal handlers, | |
| 129 file descriptors, etc, and runs the function <TT | |
| 130 CLASS="PARAMETER" | |
| 131 ><I | |
| 132 >fn</I | |
| 133 ></TT | |
| 134 > | |
| 135 passed the void pointer <TT | |
| 136 CLASS="PARAMETER" | |
| 137 ><I | |
| 138 >data</I | |
| 139 ></TT | |
| 140 > | |
| 141 The thread quits when this function returns.</P | |
| 142 ></DIV | |
| 143 ><DIV | |
| 144 CLASS="REFSECT1" | |
| 145 ><A | |
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146 NAME="AEN7717" |
| 0 | 147 ></A |
| 148 ><H2 | |
| 149 >See Also</H2 | |
| 150 ><P | |
| 151 ><A | |
| 152 HREF="sdlkillthread.html" | |
| 153 ><TT | |
| 154 CLASS="FUNCTION" | |
| 155 >SDL_KillThread</TT | |
| 156 ></A | |
| 157 ></P | |
| 158 ></DIV | |
| 159 ><DIV | |
| 160 CLASS="NAVFOOTER" | |
| 161 ><HR | |
| 162 ALIGN="LEFT" | |
| 163 WIDTH="100%"><TABLE | |
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164 SUMMARY="Footer navigation table" |
| 0 | 165 WIDTH="100%" |
| 166 BORDER="0" | |
| 167 CELLPADDING="0" | |
| 168 CELLSPACING="0" | |
| 169 ><TR | |
| 170 ><TD | |
| 171 WIDTH="33%" | |
| 172 ALIGN="left" | |
| 173 VALIGN="top" | |
| 174 ><A | |
| 175 HREF="thread.html" | |
|
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355632dca928
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parents:
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176 ACCESSKEY="P" |
| 0 | 177 >Prev</A |
| 178 ></TD | |
| 179 ><TD | |
| 180 WIDTH="34%" | |
| 181 ALIGN="center" | |
| 182 VALIGN="top" | |
| 183 ><A | |
| 184 HREF="index.html" | |
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parents:
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185 ACCESSKEY="H" |
| 0 | 186 >Home</A |
| 187 ></TD | |
| 188 ><TD | |
| 189 WIDTH="33%" | |
| 190 ALIGN="right" | |
| 191 VALIGN="top" | |
| 192 ><A | |
| 193 HREF="sdlthreadid.html" | |
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355632dca928
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parents:
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194 ACCESSKEY="N" |
| 0 | 195 >Next</A |
| 196 ></TD | |
| 197 ></TR | |
| 198 ><TR | |
| 199 ><TD | |
| 200 WIDTH="33%" | |
| 201 ALIGN="left" | |
| 202 VALIGN="top" | |
| 203 >Multi-threaded Programming</TD | |
| 204 ><TD | |
| 205 WIDTH="34%" | |
| 206 ALIGN="center" | |
| 207 VALIGN="top" | |
| 208 ><A | |
| 209 HREF="thread.html" | |
|
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355632dca928
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parents:
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210 ACCESSKEY="U" |
| 0 | 211 >Up</A |
| 212 ></TD | |
| 213 ><TD | |
| 214 WIDTH="33%" | |
| 215 ALIGN="right" | |
| 216 VALIGN="top" | |
| 217 >SDL_ThreadID</TD | |
| 218 ></TR | |
| 219 ></TABLE | |
| 220 ></DIV | |
| 221 ></BODY | |
| 222 ></HTML | |
| 223 > |