Mercurial > sdl-ios-xcode
annotate docs/html/sdlcdpause.html @ 765:4c2ba6161939
Editors Note: The original patch was modified to use SDL_Delay() instead of
nanosleep because nanosleep may not be portable to all systems
using SDL with the ALSA backend. This may be a moot point with
the switch to blocking writes anyway...
Date: Sat, 27 Dec 2003 21:47:36 +0100
From: Michel Daenzer
To: Debian Bug Tracking System
Subject: [SDL] Bug#225252: [PATCH] ALSA fixes
Package: libsdl1.2debian-all
Version: 1.2.6-2
Severity: normal
Tags: patch
For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with
SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU
usage, interrupted sound and stuttering in some games here. Taking a nanosleep
whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more
efficient to use blocking mode for the actual sound playback. Feedback from the
SDL and ALSA lists appreciated.
The patch also fixes the default ALSA device to be used.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 04 Jan 2004 15:40:50 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_CDPause</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="CD-ROM" | |
| 14 HREF="cdrom.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_CDPlayTracks" | |
| 17 HREF="sdlcdplaytracks.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CDResume" | |
| 20 HREF="sdlcdresume.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="sdlcdplaytracks.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="sdlcdresume.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="SDLCDPAUSE" | |
| 71 >SDL_CDPause</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN7037" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_CDPause -- Pauses a CDROM</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
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84 NAME="AEN7040" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN7041" |
| 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 >int <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_CDPause</B | |
| 105 ></CODE | |
| 106 >(SDL_CD *cdrom);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN7047" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Pauses play on the given <TT | |
| 121 CLASS="PARAMETER" | |
| 122 ><I | |
| 123 >cdrom</I | |
| 124 ></TT | |
| 125 >.</P | |
| 126 ></DIV | |
| 127 ><DIV | |
| 128 CLASS="REFSECT1" | |
| 129 ><A | |
|
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130 NAME="AEN7051" |
| 0 | 131 ></A |
| 132 ><H2 | |
| 133 >Return Value</H2 | |
| 134 ><P | |
| 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 ></DIV | |
| 143 ><DIV | |
| 144 CLASS="REFSECT1" | |
| 145 ><A | |
|
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146 NAME="AEN7056" |
| 0 | 147 ></A |
| 148 ><H2 | |
| 149 >See Also</H2 | |
| 150 ><P | |
| 151 ><A | |
| 152 HREF="sdlcdplay.html" | |
| 153 ><TT | |
| 154 CLASS="FUNCTION" | |
| 155 >SDL_CDPlay</TT | |
| 156 ></A | |
| 157 >, | |
| 158 <A | |
| 159 HREF="sdlcdresume.html" | |
| 160 ><TT | |
| 161 CLASS="FUNCTION" | |
| 162 >SDL_CDResume</TT | |
| 163 ></A | |
| 164 ></P | |
| 165 ></DIV | |
| 166 ><DIV | |
| 167 CLASS="NAVFOOTER" | |
| 168 ><HR | |
| 169 ALIGN="LEFT" | |
| 170 WIDTH="100%"><TABLE | |
| 171 WIDTH="100%" | |
| 172 BORDER="0" | |
| 173 CELLPADDING="0" | |
| 174 CELLSPACING="0" | |
| 175 ><TR | |
| 176 ><TD | |
| 177 WIDTH="33%" | |
| 178 ALIGN="left" | |
| 179 VALIGN="top" | |
| 180 ><A | |
| 181 HREF="sdlcdplaytracks.html" | |
| 182 >Prev</A | |
| 183 ></TD | |
| 184 ><TD | |
| 185 WIDTH="34%" | |
| 186 ALIGN="center" | |
| 187 VALIGN="top" | |
| 188 ><A | |
| 189 HREF="index.html" | |
| 190 >Home</A | |
| 191 ></TD | |
| 192 ><TD | |
| 193 WIDTH="33%" | |
| 194 ALIGN="right" | |
| 195 VALIGN="top" | |
| 196 ><A | |
| 197 HREF="sdlcdresume.html" | |
| 198 >Next</A | |
| 199 ></TD | |
| 200 ></TR | |
| 201 ><TR | |
| 202 ><TD | |
| 203 WIDTH="33%" | |
| 204 ALIGN="left" | |
| 205 VALIGN="top" | |
| 206 >SDL_CDPlayTracks</TD | |
| 207 ><TD | |
| 208 WIDTH="34%" | |
| 209 ALIGN="center" | |
| 210 VALIGN="top" | |
| 211 ><A | |
| 212 HREF="cdrom.html" | |
| 213 >Up</A | |
| 214 ></TD | |
| 215 ><TD | |
| 216 WIDTH="33%" | |
| 217 ALIGN="right" | |
| 218 VALIGN="top" | |
| 219 >SDL_CDResume</TD | |
| 220 ></TR | |
| 221 ></TABLE | |
| 222 ></DIV | |
| 223 ></BODY | |
| 224 ></HTML | |
| 225 > |