Mercurial > sdl-ios-xcode
annotate docs/html/guideaudioexamples.html @ 641:df178851293b
Date: 28 Jun 2003 22:42:52 +0100
From: Alan Swanson
Subject: Re: [SDL] New XFree 4.3 Video Mode Patch
I have a wee amendment that moves the qsort in set_best_resolution
to only occur after failing to find an exact match only. This would
make absolutely sure we get a user set mode.
While I've never had any problems for my normal resolutions (1280x1024,
1024x768, 800x600 & 640,480) while closely examining the output from
qsort I've noticed it doesn't seem to sort the modes fully. These is
one definite wrong at 1152x768 and a few that just look wrong to me.
From a program (attached) I made to examine this more easily. X has
sorted its mode list using the same method as ours (plus frequency),
and our user modes get inserted without any other movement.
On the patch I've made I've also changed cmpmodes to sort on vertical
resolution and then horizontal. Ie vertical is now most significant
bit.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 28 Jun 2003 21:52:26 +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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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 ); | |
|
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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 > |