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annotate docs/html/guideaudioexamples.html @ 295:54ad1d2f1325
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 06 Mar 2002 05:37:21 +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
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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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parents:
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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 > |