Mercurial > sdl-ios-xcode
annotate docs/html/sdlcdplay.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_CDPlay</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_CDStatus" | |
| 17 HREF="sdlcdstatus.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CDPlayTracks" | |
| 20 HREF="sdlcdplaytracks.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="sdlcdstatus.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="sdlcdplaytracks.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="SDLCDPLAY" | |
| 71 >SDL_CDPlay</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN6955" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_CDPlay -- Play a CD</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
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84 NAME="AEN6958" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN6959" |
| 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_CDPlay</B | |
| 105 ></CODE | |
| 106 >(SDL_CD *cdrom, int start, int length);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN6965" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Plays the given <TT | |
| 121 CLASS="PARAMETER" | |
| 122 ><I | |
| 123 >cdrom</I | |
| 124 ></TT | |
| 125 >, starting a frame <TT | |
| 126 CLASS="PARAMETER" | |
| 127 ><I | |
| 128 >start</I | |
| 129 ></TT | |
| 130 > for <TT | |
| 131 CLASS="PARAMETER" | |
| 132 ><I | |
| 133 >length</I | |
| 134 ></TT | |
| 135 > frames.</P | |
| 136 ></DIV | |
| 137 ><DIV | |
| 138 CLASS="REFSECT1" | |
| 139 ><A | |
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140 NAME="AEN6971" |
| 0 | 141 ></A |
| 142 ><H2 | |
| 143 >Return Values</H2 | |
| 144 ><P | |
| 145 >Returns <SPAN | |
| 146 CLASS="RETURNVALUE" | |
| 147 >0</SPAN | |
| 148 > on success, or <SPAN | |
| 149 CLASS="RETURNVALUE" | |
| 150 >-1</SPAN | |
| 151 > on an error.</P | |
| 152 ></DIV | |
| 153 ><DIV | |
| 154 CLASS="REFSECT1" | |
| 155 ><A | |
|
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156 NAME="AEN6976" |
| 0 | 157 ></A |
| 158 ><H2 | |
| 159 >See Also</H2 | |
| 160 ><P | |
| 161 ><A | |
| 162 HREF="sdlcdplaytracks.html" | |
| 163 ><TT | |
| 164 CLASS="FUNCTION" | |
| 165 >SDL_CDPlayTracks</TT | |
| 166 ></A | |
| 167 >, | |
| 168 <A | |
| 169 HREF="sdlcdstop.html" | |
| 170 ><TT | |
| 171 CLASS="FUNCTION" | |
| 172 >SDL_CDStop</TT | |
| 173 ></A | |
| 174 ></P | |
| 175 ></DIV | |
| 176 ><DIV | |
| 177 CLASS="NAVFOOTER" | |
| 178 ><HR | |
| 179 ALIGN="LEFT" | |
| 180 WIDTH="100%"><TABLE | |
| 181 WIDTH="100%" | |
| 182 BORDER="0" | |
| 183 CELLPADDING="0" | |
| 184 CELLSPACING="0" | |
| 185 ><TR | |
| 186 ><TD | |
| 187 WIDTH="33%" | |
| 188 ALIGN="left" | |
| 189 VALIGN="top" | |
| 190 ><A | |
| 191 HREF="sdlcdstatus.html" | |
| 192 >Prev</A | |
| 193 ></TD | |
| 194 ><TD | |
| 195 WIDTH="34%" | |
| 196 ALIGN="center" | |
| 197 VALIGN="top" | |
| 198 ><A | |
| 199 HREF="index.html" | |
| 200 >Home</A | |
| 201 ></TD | |
| 202 ><TD | |
| 203 WIDTH="33%" | |
| 204 ALIGN="right" | |
| 205 VALIGN="top" | |
| 206 ><A | |
| 207 HREF="sdlcdplaytracks.html" | |
| 208 >Next</A | |
| 209 ></TD | |
| 210 ></TR | |
| 211 ><TR | |
| 212 ><TD | |
| 213 WIDTH="33%" | |
| 214 ALIGN="left" | |
| 215 VALIGN="top" | |
| 216 >SDL_CDStatus</TD | |
| 217 ><TD | |
| 218 WIDTH="34%" | |
| 219 ALIGN="center" | |
| 220 VALIGN="top" | |
| 221 ><A | |
| 222 HREF="cdrom.html" | |
| 223 >Up</A | |
| 224 ></TD | |
| 225 ><TD | |
| 226 WIDTH="33%" | |
| 227 ALIGN="right" | |
| 228 VALIGN="top" | |
| 229 >SDL_CDPlayTracks</TD | |
| 230 ></TR | |
| 231 ></TABLE | |
| 232 ></DIV | |
| 233 ></BODY | |
| 234 ></HTML | |
| 235 > |