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annotate docs/html/sdlbuildaudiocvt.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 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_BuildAudioCVT</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="Audio" | |
14 HREF="audio.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_AudioCVT" | |
17 HREF="sdlaudiocvt.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_ConvertAudio" | |
20 HREF="sdlconvertaudio.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="sdlaudiocvt.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="sdlconvertaudio.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="SDLBUILDAUDIOCVT" | |
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74 ></A |
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75 >SDL_BuildAudioCVT</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN7002" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_BuildAudioCVT -- Initializes a SDL_AudioCVT structure for conversion</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN7005" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN7006" |
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 >int <B | |
106 CLASS="FSFUNC" | |
107 >SDL_BuildAudioCVT</B | |
108 ></CODE | |
109 >(SDL_AudioCVT *cvt, Uint16 src_format, Uint8 src_channels, int src_rate, Uint16 dst_format, Uint8 dst_channels, int dst_rate);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN7012" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 >Before an <A | |
124 HREF="sdlaudiocvt.html" | |
125 ><SPAN | |
126 CLASS="STRUCTNAME" | |
127 >SDL_AudioCVT</SPAN | |
128 ></A | |
129 > structure can be used to convert audio data it must be initialized with source and destination information. </P | |
130 ><P | |
131 ><TT | |
132 CLASS="PARAMETER" | |
133 ><I | |
134 >src_format</I | |
135 ></TT | |
136 > and <TT | |
137 CLASS="PARAMETER" | |
138 ><I | |
139 >dst_format</I | |
140 ></TT | |
141 > are the source and destination format of the conversion. (For information on audio formats see <A | |
142 HREF="sdlaudiospec.html" | |
143 ><SPAN | |
144 CLASS="STRUCTNAME" | |
145 > SDL_AudioSpec</SPAN | |
146 ></A | |
147 >). <TT | |
148 CLASS="PARAMETER" | |
149 ><I | |
150 >src_channels</I | |
151 ></TT | |
152 > and <TT | |
153 CLASS="PARAMETER" | |
154 ><I | |
155 >dst_channels</I | |
156 ></TT | |
157 > are the number of channels in the source and destination formats. Finally, <TT | |
158 CLASS="PARAMETER" | |
159 ><I | |
160 >src_rate</I | |
161 ></TT | |
162 > and <TT | |
163 CLASS="PARAMETER" | |
164 ><I | |
165 >dst_rate</I | |
166 ></TT | |
167 > are the frequency or samples-per-second of the source and destination formats. Once again, see <A | |
168 HREF="sdlaudiospec.html" | |
169 ><SPAN | |
170 CLASS="STRUCTNAME" | |
171 >SDL_AudioSpec</SPAN | |
172 ></A | |
173 >.</P | |
174 ></DIV | |
175 ><DIV | |
176 CLASS="REFSECT1" | |
177 ><A | |
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178 NAME="AEN7028" |
0 | 179 ></A |
180 ><H2 | |
181 >Return Values</H2 | |
182 ><P | |
183 >Returns <SPAN | |
184 CLASS="RETURNVALUE" | |
185 >-1</SPAN | |
186 > if the filter could not be built or 1 if it could.</P | |
187 ></DIV | |
188 ><DIV | |
189 CLASS="REFSECT1" | |
190 ><A | |
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191 NAME="AEN7032" |
0 | 192 ></A |
193 ><H2 | |
194 >Examples</H2 | |
195 ><P | |
196 >See <A | |
197 HREF="sdlconvertaudio.html" | |
198 ><TT | |
199 CLASS="FUNCTION" | |
200 >SDL_ConvertAudio</TT | |
201 ></A | |
202 >.</P | |
203 ></DIV | |
204 ><DIV | |
205 CLASS="REFSECT1" | |
206 ><A | |
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207 NAME="AEN7037" |
0 | 208 ></A |
209 ><H2 | |
210 >See Also</H2 | |
211 ><P | |
212 ><A | |
213 HREF="sdlconvertaudio.html" | |
214 ><TT | |
215 CLASS="FUNCTION" | |
216 >SDL_ConvertAudio</TT | |
217 ></A | |
218 >, | |
219 <A | |
220 HREF="sdlaudiocvt.html" | |
221 ><TT | |
222 CLASS="FUNCTION" | |
223 >SDL_AudioCVT</TT | |
224 ></A | |
225 ></P | |
226 ></DIV | |
227 ><DIV | |
228 CLASS="NAVFOOTER" | |
229 ><HR | |
230 ALIGN="LEFT" | |
231 WIDTH="100%"><TABLE | |
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232 SUMMARY="Footer navigation table" |
0 | 233 WIDTH="100%" |
234 BORDER="0" | |
235 CELLPADDING="0" | |
236 CELLSPACING="0" | |
237 ><TR | |
238 ><TD | |
239 WIDTH="33%" | |
240 ALIGN="left" | |
241 VALIGN="top" | |
242 ><A | |
243 HREF="sdlaudiocvt.html" | |
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244 ACCESSKEY="P" |
0 | 245 >Prev</A |
246 ></TD | |
247 ><TD | |
248 WIDTH="34%" | |
249 ALIGN="center" | |
250 VALIGN="top" | |
251 ><A | |
252 HREF="index.html" | |
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253 ACCESSKEY="H" |
0 | 254 >Home</A |
255 ></TD | |
256 ><TD | |
257 WIDTH="33%" | |
258 ALIGN="right" | |
259 VALIGN="top" | |
260 ><A | |
261 HREF="sdlconvertaudio.html" | |
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262 ACCESSKEY="N" |
0 | 263 >Next</A |
264 ></TD | |
265 ></TR | |
266 ><TR | |
267 ><TD | |
268 WIDTH="33%" | |
269 ALIGN="left" | |
270 VALIGN="top" | |
271 >SDL_AudioCVT</TD | |
272 ><TD | |
273 WIDTH="34%" | |
274 ALIGN="center" | |
275 VALIGN="top" | |
276 ><A | |
277 HREF="audio.html" | |
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278 ACCESSKEY="U" |
0 | 279 >Up</A |
280 ></TD | |
281 ><TD | |
282 WIDTH="33%" | |
283 ALIGN="right" | |
284 VALIGN="top" | |
285 >SDL_ConvertAudio</TD | |
286 ></TR | |
287 ></TABLE | |
288 ></DIV | |
289 ></BODY | |
290 ></HTML | |
291 > |