Mercurial > sdl-ios-xcode
annotate docs/html/guideaudioexamples.html @ 320:66f815c147ed
Date: Thu, 28 Mar 2002 09:20:03 +0200
From: "Mike Gorchak" <mike@malva.ua>
Subject: New QNX patch.
Hi !
1. Removed warning (possible bug) with invalid type, passing to the function
in ph_WarpedMotion.
2. Rewritten handler of Ph_WM_RESIZE message, now works, but buggy (old
handler doesn't work at all).
3. Added stub handler for Ph_WM_MAX (maximize) message.
4. Added more #ifdef HAVE_OPENGL to disable OpenGL stuff when it not needed.
5. Added support for SDL_NOFRAME and SDL_RESIZABLE flags (in OpenGL windows
too).
6. Added cosmetic changes, if no SDL_RESIZABLE flag defined, disable resize
handlers in window border and maximize button at caption.
7. Fixed my bug with invalid arguments count passed to PtCreateWidget call.
8. Fixed some palette problems.
9. Updated README.QNX file.
And I changed testgl.c test application:
10. Added in testgl.c application support for SDL_NOFRAME flag and
option -noframe.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 28 Mar 2002 16:20:10 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >Audio Examples</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="Examples" | |
| 14 HREF="guideexamples.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="Event Examples" | |
| 17 HREF="guideeventexamples.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="CDROM Examples" | |
| 20 HREF="guidecdromexamples.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="SECT1" | |
| 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="guideeventexamples.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 >Chapter 4. Examples</TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="guidecdromexamples.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><DIV | |
| 69 CLASS="SECT1" | |
| 70 ><H1 | |
| 71 CLASS="SECT1" | |
| 72 ><A | |
| 73 NAME="GUIDEAUDIOEXAMPLES" | |
| 74 >Audio Examples</A | |
| 75 ></H1 | |
| 76 ><P | |
| 77 ></P | |
| 78 ><DIV | |
| 79 CLASS="SECT2" | |
| 80 ><H2 | |
| 81 CLASS="SECT2" | |
| 82 ><A | |
|
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83 NAME="AEN382" |
| 0 | 84 >Opening the audio device</A |
| 85 ></H2 | |
| 86 ><P | |
| 87 ><PRE | |
| 88 CLASS="PROGRAMLISTING" | |
| 89 > SDL_AudioSpec wanted; | |
| 90 extern void fill_audio(void *udata, Uint8 *stream, int len); | |
| 91 | |
| 92 /* Set the audio format */ | |
| 93 wanted.freq = 22050; | |
| 94 wanted.format = AUDIO_S16; | |
| 95 wanted.channels = 2; /* 1 = mono, 2 = stereo */ | |
| 96 wanted.samples = 1024; /* Good low-latency value for callback */ | |
| 97 wanted.callback = fill_audio; | |
| 98 wanted.userdata = NULL; | |
| 99 | |
| 100 /* Open the audio device, forcing the desired format */ | |
| 101 if ( SDL_OpenAudio(&wanted, NULL) < 0 ) { | |
| 102 fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError()); | |
| 103 return(-1); | |
| 104 } | |
| 105 return(0);</PRE | |
| 106 ></P | |
| 107 ></DIV | |
| 108 ><DIV | |
| 109 CLASS="SECT2" | |
| 110 ><H2 | |
| 111 CLASS="SECT2" | |
| 112 ><A | |
|
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parents:
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diff
changeset
|
113 NAME="AEN386" |
| 0 | 114 >Playing audio</A |
| 115 ></H2 | |
| 116 ><P | |
| 117 ><PRE | |
| 118 CLASS="PROGRAMLISTING" | |
| 119 > static Uint8 *audio_chunk; | |
| 120 static Uint32 audio_len; | |
| 121 static Uint8 *audio_pos; | |
| 122 | |
| 123 /* The audio function callback takes the following parameters: | |
| 124 stream: A pointer to the audio buffer to be filled | |
| 125 len: The length (in bytes) of the audio buffer | |
| 126 */ | |
| 127 void fill_audio(void *udata, Uint8 *stream, int len) | |
| 128 { | |
| 129 /* Only play if we have data left */ | |
| 130 if ( audio_len == 0 ) | |
| 131 return; | |
| 132 | |
| 133 /* Mix as much data as possible */ | |
| 134 len = ( len > audio_len ? audio_len : len ); | |
|
181
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|
135 SDL_MixAudio(stream, audio_pos, len, SDL_MIX_MAXVOLUME); |
| 0 | 136 audio_pos += len; |
| 137 audio_len -= len; | |
| 138 } | |
| 139 | |
| 140 /* Load the audio data ... */ | |
| 141 | |
| 142 ;;;;; | |
| 143 | |
| 144 audio_pos = audio_chunk; | |
| 145 | |
| 146 /* Let the callback function play the audio chunk */ | |
| 147 SDL_PauseAudio(0); | |
| 148 | |
| 149 /* Do some processing */ | |
| 150 | |
| 151 ;;;;; | |
| 152 | |
| 153 /* Wait for sound to complete */ | |
| 154 while ( audio_len > 0 ) { | |
| 155 SDL_Delay(100); /* Sleep 1/10 second */ | |
| 156 } | |
| 157 SDL_CloseAudio();</PRE | |
| 158 ></P | |
| 159 ></DIV | |
| 160 ></DIV | |
| 161 ><DIV | |
| 162 CLASS="NAVFOOTER" | |
| 163 ><HR | |
| 164 ALIGN="LEFT" | |
| 165 WIDTH="100%"><TABLE | |
| 166 WIDTH="100%" | |
| 167 BORDER="0" | |
| 168 CELLPADDING="0" | |
| 169 CELLSPACING="0" | |
| 170 ><TR | |
| 171 ><TD | |
| 172 WIDTH="33%" | |
| 173 ALIGN="left" | |
| 174 VALIGN="top" | |
| 175 ><A | |
| 176 HREF="guideeventexamples.html" | |
| 177 >Prev</A | |
| 178 ></TD | |
| 179 ><TD | |
| 180 WIDTH="34%" | |
| 181 ALIGN="center" | |
| 182 VALIGN="top" | |
| 183 ><A | |
| 184 HREF="index.html" | |
| 185 >Home</A | |
| 186 ></TD | |
| 187 ><TD | |
| 188 WIDTH="33%" | |
| 189 ALIGN="right" | |
| 190 VALIGN="top" | |
| 191 ><A | |
| 192 HREF="guidecdromexamples.html" | |
| 193 >Next</A | |
| 194 ></TD | |
| 195 ></TR | |
| 196 ><TR | |
| 197 ><TD | |
| 198 WIDTH="33%" | |
| 199 ALIGN="left" | |
| 200 VALIGN="top" | |
| 201 >Event Examples</TD | |
| 202 ><TD | |
| 203 WIDTH="34%" | |
| 204 ALIGN="center" | |
| 205 VALIGN="top" | |
| 206 ><A | |
| 207 HREF="guideexamples.html" | |
| 208 >Up</A | |
| 209 ></TD | |
| 210 ><TD | |
| 211 WIDTH="33%" | |
| 212 ALIGN="right" | |
| 213 VALIGN="top" | |
| 214 >CDROM Examples</TD | |
| 215 ></TR | |
| 216 ></TABLE | |
| 217 ></DIV | |
| 218 ></BODY | |
| 219 ></HTML | |
| 220 > |