Mercurial > sdl-ios-xcode
annotate docs/html/sdlcondsignal.html @ 3880:74e828c64315 SDL-1.2
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 15:45:37 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_CondSignal</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_DestroyCond" | |
| 17 HREF="sdldestroycond.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CondBroadcast" | |
| 20 HREF="sdlcondbroadcast.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="sdldestroycond.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="sdlcondbroadcast.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="SDLCONDSIGNAL" | |
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74 ></A |
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75 >SDL_CondSignal</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN8310" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_CondSignal -- Restart a thread wait on a condition variable</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN8313" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN8314" |
| 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_CondSignal</B | |
| 109 ></CODE | |
| 110 >(SDL_cond *cond);</CODE | |
| 111 ></P | |
| 112 ><P | |
| 113 ></P | |
| 114 ></DIV | |
| 115 ></DIV | |
| 116 ><DIV | |
| 117 CLASS="REFSECT1" | |
| 118 ><A | |
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119 NAME="AEN8320" |
| 0 | 120 ></A |
| 121 ><H2 | |
| 122 >Description</H2 | |
| 123 ><P | |
| 124 >Restart one of the threads that are waiting on the condition variable, <TT | |
| 125 CLASS="PARAMETER" | |
| 126 ><I | |
| 127 >cond</I | |
| 128 ></TT | |
| 129 >. Returns <SPAN | |
| 130 CLASS="RETURNVALUE" | |
| 131 >0</SPAN | |
| 132 > on success of <SPAN | |
| 133 CLASS="RETURNVALUE" | |
| 134 >-1</SPAN | |
| 135 > on an error.</P | |
| 136 ></DIV | |
| 137 ><DIV | |
| 138 CLASS="REFSECT1" | |
| 139 ><A | |
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140 NAME="AEN8326" |
| 0 | 141 ></A |
| 142 ><H2 | |
| 143 >See Also</H2 | |
| 144 ><P | |
| 145 ><A | |
| 146 HREF="sdlcondwait.html" | |
| 147 ><TT | |
| 148 CLASS="FUNCTION" | |
| 149 >SDL_CondWait</TT | |
| 150 ></A | |
| 151 >, | |
| 152 <A | |
| 153 HREF="sdlcondbroadcast.html" | |
| 154 ><TT | |
| 155 CLASS="FUNCTION" | |
| 156 >SDL_CondBroadcast</TT | |
| 157 ></A | |
| 158 ></P | |
| 159 ></DIV | |
| 160 ><DIV | |
| 161 CLASS="NAVFOOTER" | |
| 162 ><HR | |
| 163 ALIGN="LEFT" | |
| 164 WIDTH="100%"><TABLE | |
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165 SUMMARY="Footer navigation table" |
| 0 | 166 WIDTH="100%" |
| 167 BORDER="0" | |
| 168 CELLPADDING="0" | |
| 169 CELLSPACING="0" | |
| 170 ><TR | |
| 171 ><TD | |
| 172 WIDTH="33%" | |
| 173 ALIGN="left" | |
| 174 VALIGN="top" | |
| 175 ><A | |
| 176 HREF="sdldestroycond.html" | |
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parents:
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177 ACCESSKEY="P" |
| 0 | 178 >Prev</A |
| 179 ></TD | |
| 180 ><TD | |
| 181 WIDTH="34%" | |
| 182 ALIGN="center" | |
| 183 VALIGN="top" | |
| 184 ><A | |
| 185 HREF="index.html" | |
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186 ACCESSKEY="H" |
| 0 | 187 >Home</A |
| 188 ></TD | |
| 189 ><TD | |
| 190 WIDTH="33%" | |
| 191 ALIGN="right" | |
| 192 VALIGN="top" | |
| 193 ><A | |
| 194 HREF="sdlcondbroadcast.html" | |
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195 ACCESSKEY="N" |
| 0 | 196 >Next</A |
| 197 ></TD | |
| 198 ></TR | |
| 199 ><TR | |
| 200 ><TD | |
| 201 WIDTH="33%" | |
| 202 ALIGN="left" | |
| 203 VALIGN="top" | |
| 204 >SDL_DestroyCond</TD | |
| 205 ><TD | |
| 206 WIDTH="34%" | |
| 207 ALIGN="center" | |
| 208 VALIGN="top" | |
| 209 ><A | |
| 210 HREF="thread.html" | |
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211 ACCESSKEY="U" |
| 0 | 212 >Up</A |
| 213 ></TD | |
| 214 ><TD | |
| 215 WIDTH="33%" | |
| 216 ALIGN="right" | |
| 217 VALIGN="top" | |
| 218 >SDL_CondBroadcast</TD | |
| 219 ></TR | |
| 220 ></TABLE | |
| 221 ></DIV | |
| 222 ></BODY | |
| 223 ></HTML | |
| 224 > |