Mercurial > sdl-ios-xcode
annotate docs/html/sdlmutexv.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 (2006-09-24) |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_mutexV</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="SDL_mutexP" | |
| 17 HREF="sdlmutexp.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CreateSemaphore" | |
| 20 HREF="sdlcreatesemaphore.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="sdlmutexp.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="sdlcreatesemaphore.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="SDLMUTEXV" | |
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74 ></A |
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75 >SDL_mutexV</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN7905" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_mutexV -- Unlock a mutex</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN7908" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN7909" |
| 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 >int <B | |
| 107 CLASS="FSFUNC" | |
| 108 >SDL_mutexV</B | |
| 109 ></CODE | |
| 110 >(SDL_mutex *mutex);</CODE | |
| 111 ></P | |
| 112 ><P | |
| 113 ></P | |
| 114 ></DIV | |
| 115 ></DIV | |
| 116 ><DIV | |
| 117 CLASS="REFSECT1" | |
| 118 ><A | |
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119 NAME="AEN7915" |
| 0 | 120 ></A |
| 121 ><H2 | |
| 122 >Description</H2 | |
| 123 ><P | |
| 124 >Unlocks the <TT | |
| 125 CLASS="PARAMETER" | |
| 126 ><I | |
| 127 >mutex</I | |
| 128 ></TT | |
| 129 >, which was previously created with <A | |
| 130 HREF="sdlcreatemutex.html" | |
| 131 ><TT | |
| 132 CLASS="FUNCTION" | |
| 133 >SDL_CreateMutex</TT | |
| 134 ></A | |
| 135 >. Returns <SPAN | |
| 136 CLASS="RETURNVALUE" | |
| 137 >0</SPAN | |
| 138 > on success, or <SPAN | |
| 139 CLASS="RETURNVALUE" | |
| 140 >-1</SPAN | |
| 141 > on an error.</P | |
| 142 ><P | |
| 143 >SDL also defines a macro <TT | |
| 144 CLASS="LITERAL" | |
| 145 >#define SDL_UnlockMutex(m) SDL_mutexV(m)</TT | |
| 146 >.</P | |
| 147 ></DIV | |
| 148 ><DIV | |
| 149 CLASS="REFSECT1" | |
| 150 ><A | |
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151 NAME="AEN7925" |
| 0 | 152 ></A |
| 153 ><H2 | |
| 154 >See Also</H2 | |
| 155 ><P | |
| 156 ><A | |
| 157 HREF="sdlcreatemutex.html" | |
| 158 ><TT | |
| 159 CLASS="FUNCTION" | |
| 160 >SDL_CreateMutex</TT | |
| 161 ></A | |
| 162 >, | |
| 163 <A | |
| 164 HREF="sdlmutexp.html" | |
| 165 ><TT | |
| 166 CLASS="FUNCTION" | |
| 167 >SDL_mutexP</TT | |
| 168 ></A | |
| 169 ></P | |
| 170 ></DIV | |
| 171 ><DIV | |
| 172 CLASS="NAVFOOTER" | |
| 173 ><HR | |
| 174 ALIGN="LEFT" | |
| 175 WIDTH="100%"><TABLE | |
|
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176 SUMMARY="Footer navigation table" |
| 0 | 177 WIDTH="100%" |
| 178 BORDER="0" | |
| 179 CELLPADDING="0" | |
| 180 CELLSPACING="0" | |
| 181 ><TR | |
| 182 ><TD | |
| 183 WIDTH="33%" | |
| 184 ALIGN="left" | |
| 185 VALIGN="top" | |
| 186 ><A | |
| 187 HREF="sdlmutexp.html" | |
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parents:
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188 ACCESSKEY="P" |
| 0 | 189 >Prev</A |
| 190 ></TD | |
| 191 ><TD | |
| 192 WIDTH="34%" | |
| 193 ALIGN="center" | |
| 194 VALIGN="top" | |
| 195 ><A | |
| 196 HREF="index.html" | |
|
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197 ACCESSKEY="H" |
| 0 | 198 >Home</A |
| 199 ></TD | |
| 200 ><TD | |
| 201 WIDTH="33%" | |
| 202 ALIGN="right" | |
| 203 VALIGN="top" | |
| 204 ><A | |
| 205 HREF="sdlcreatesemaphore.html" | |
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355632dca928
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parents:
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changeset
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206 ACCESSKEY="N" |
| 0 | 207 >Next</A |
| 208 ></TD | |
| 209 ></TR | |
| 210 ><TR | |
| 211 ><TD | |
| 212 WIDTH="33%" | |
| 213 ALIGN="left" | |
| 214 VALIGN="top" | |
| 215 >SDL_mutexP</TD | |
| 216 ><TD | |
| 217 WIDTH="34%" | |
| 218 ALIGN="center" | |
| 219 VALIGN="top" | |
| 220 ><A | |
| 221 HREF="thread.html" | |
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parents:
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222 ACCESSKEY="U" |
| 0 | 223 >Up</A |
| 224 ></TD | |
| 225 ><TD | |
| 226 WIDTH="33%" | |
| 227 ALIGN="right" | |
| 228 VALIGN="top" | |
| 229 >SDL_CreateSemaphore</TD | |
| 230 ></TR | |
| 231 ></TABLE | |
| 232 ></DIV | |
| 233 ></BODY | |
| 234 ></HTML | |
| 235 > |