Mercurial > sdl-ios-xcode
annotate docs/html/guideaudioexamples.html @ 693:6c119628180d
Date: Sat, 16 Aug 2003 16:22:56 +0300
From: "Mike Gorchak"
Subject: Package building for QNX6
I'm just completed the package description file for QNX6 - qpg, it is like a\
.spec files for Linux. Please place SDL.qpg.in file in the root of the proj\
ect, where .spec file is placed. And sdl12qpg.diff - just adding the SDL.qpg\
.in. The same for the SDL_image. I'm planning to add .qpg files creation for\
all SDL* projects.
As for shared library building for QNX6. It is very hard to improve the exis\
ting libtool code to support QNX shared libraries. Much easyiest is to remov\
e libtool.m4 code from the acinclude.m4 for those persons, who building shar\
ed libraries for QNX6. I'm described all what they need to do with .so under\
QNX6 in the README.QNX file. And 90% of people used the precompiled librari\
es, so I think it is not big problem :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 23 Aug 2003 23:25:46 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >Audio Examples</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
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 | |
|
55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
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 | |
|
55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
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
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
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 > |