Mercurial > sdl-ios-xcode
annotate docs/html/sdlbuildaudiocvt.html @ 3096:ae4e80dbe330
Date: Tue, 17 Feb 2009 14:00:25 +0100
From: Stefan Klug
Subject: [SDL] Possible bug, paused audio playing garbage
On my WinCE device a paused audio device plays random garbage.
This might also be the issue in the thread "sound cracks with SDL_mixer
and AUDIO_S16LSB"
I don't have that much knowledge of the SDL audio part, but the attached
patch fixes it for me, and collapses two redundant ifs.
I'm not sure if this is the correct way to fix this.
Shouldn't the complete stream conversion part of the RunAudio loop be
dependent on the paused property of the device? (not only the call to
(*fill)(udata, istream, istream_len).
Anyways. Would be great if the patch or a fix could find its way to SVN ;-)
Cheers
Stefan
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 23 Mar 2009 05:21:40 +0000 |
| parents | 355632dca928 |
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| rev | line source |
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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 | |
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| 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 > |