Mercurial > sdl-ios-xcode
annotate docs/html/sdlunlocksurface.html @ 1260:80f8c94b5199
Date: 10 Jun 2003 15:30:59 -0400
From: Mike Shal
Subject: [SDL] Bug in SDL_wave.c?
Hey everyone, I'm not sure if this is a bug in SDL, or if I just have
incorrect WAV files. The problem I'm having is loading multiple
concatenated WAVs from SDL_LoadWAV_RW. Some WAV files put comments at
the end of the file (which may be bad form), and SDL doesn't skip past
them when reading from the RWops. So the next WAV I try to load will
start at the comment section of the previous WAV, which obviously
doesn't work. If anyone else is having this problem, one quick fix you
can do is run sox on the bad WAVs, which strips out all of the comment
sections.
Eg:
$ sox sound.wav tmp.wav
$ mv -f tmp.wav sound.wav
The other fix is to patch SDL_wave.c, which is included with this email.
(Assuming I made the patch correctly :). All it does is calculate how
much remaining space there is in the WAV file after the data chunk, and
does SDL_RWseek to skip it. I don't think it should interfere with
anything else, but if someone could check it that would be nice :). If
the bug is really with SDL and not with my WAVs, can someone work this
into the next version of SDL? Thanks,
-Mike Shal
author | Sam Lantinga <slouken@libsdl.org> |
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date | Tue, 24 Jan 2006 07:20:18 +0000 |
parents | 355632dca928 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_UnlockSurface</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="Video" | |
14 HREF="video.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_LockSurface" | |
17 HREF="sdllocksurface.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_LoadBMP" | |
20 HREF="sdlloadbmp.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="sdllocksurface.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="sdlloadbmp.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="SDLUNLOCKSURFACE" | |
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74 ></A |
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75 >SDL_UnlockSurface</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN1962" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_UnlockSurface -- Unlocks a previously locked surface.</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN1965" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN1966" |
0 | 95 ></A |
96 ><P | |
97 ></P | |
98 ><PRE | |
99 CLASS="FUNCSYNOPSISINFO" | |
100 >#include "SDL.h"</PRE | |
101 ><P | |
102 ><CODE | |
103 ><CODE | |
104 CLASS="FUNCDEF" | |
105 >void <B | |
106 CLASS="FSFUNC" | |
107 >SDL_UnlockSurface</B | |
108 ></CODE | |
109 >(SDL_Surface *surface);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN1972" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 >Surfaces that were previously locked using <TT | |
124 CLASS="FUNCTION" | |
125 >SDL_LockSurface</TT | |
126 > must be unlocked with <TT | |
127 CLASS="FUNCTION" | |
128 >SDL_UnlockSurface</TT | |
129 >. Surfaces should be unlocked as soon as possible.</P | |
130 ><P | |
131 >It should be noted that since 1.1.8, surface locks are recursive. See <A | |
132 HREF="sdllocksurface.html" | |
133 ><TT | |
134 CLASS="FUNCTION" | |
135 >SDL_LockSurface</TT | |
136 ></A | |
137 >.</P | |
138 ></DIV | |
139 ><DIV | |
140 CLASS="REFSECT1" | |
141 ><A | |
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142 NAME="AEN1980" |
0 | 143 ></A |
144 ><H2 | |
145 >See Also</H2 | |
146 ><P | |
147 ><A | |
148 HREF="sdllocksurface.html" | |
149 ><TT | |
150 CLASS="FUNCTION" | |
151 >SDL_LockSurface</TT | |
152 ></A | |
153 ></P | |
154 ></DIV | |
155 ><DIV | |
156 CLASS="NAVFOOTER" | |
157 ><HR | |
158 ALIGN="LEFT" | |
159 WIDTH="100%"><TABLE | |
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160 SUMMARY="Footer navigation table" |
0 | 161 WIDTH="100%" |
162 BORDER="0" | |
163 CELLPADDING="0" | |
164 CELLSPACING="0" | |
165 ><TR | |
166 ><TD | |
167 WIDTH="33%" | |
168 ALIGN="left" | |
169 VALIGN="top" | |
170 ><A | |
171 HREF="sdllocksurface.html" | |
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172 ACCESSKEY="P" |
0 | 173 >Prev</A |
174 ></TD | |
175 ><TD | |
176 WIDTH="34%" | |
177 ALIGN="center" | |
178 VALIGN="top" | |
179 ><A | |
180 HREF="index.html" | |
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181 ACCESSKEY="H" |
0 | 182 >Home</A |
183 ></TD | |
184 ><TD | |
185 WIDTH="33%" | |
186 ALIGN="right" | |
187 VALIGN="top" | |
188 ><A | |
189 HREF="sdlloadbmp.html" | |
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190 ACCESSKEY="N" |
0 | 191 >Next</A |
192 ></TD | |
193 ></TR | |
194 ><TR | |
195 ><TD | |
196 WIDTH="33%" | |
197 ALIGN="left" | |
198 VALIGN="top" | |
199 >SDL_LockSurface</TD | |
200 ><TD | |
201 WIDTH="34%" | |
202 ALIGN="center" | |
203 VALIGN="top" | |
204 ><A | |
205 HREF="video.html" | |
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206 ACCESSKEY="U" |
0 | 207 >Up</A |
208 ></TD | |
209 ><TD | |
210 WIDTH="33%" | |
211 ALIGN="right" | |
212 VALIGN="top" | |
213 >SDL_LoadBMP</TD | |
214 ></TR | |
215 ></TABLE | |
216 ></DIV | |
217 ></BODY | |
218 ></HTML | |
219 > |