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annotate docs/html/guideaudioexamples.html @ 3052:b7197d7e8566
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| author | Sam Lantinga <slouken@libsdl.org> |
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| date | Fri, 30 Jan 2009 06:38:44 +0000 |
| parents | 355632dca928 |
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| rev | line source |
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| 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 1.76b+ |
| 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 | |
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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="guideeventexamples.html" | |
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49 ACCESSKEY="P" |
| 0 | 50 >Prev</A |
| 51 ></TD | |
| 52 ><TD | |
| 53 WIDTH="80%" | |
| 54 ALIGN="center" | |
| 55 VALIGN="bottom" | |
| 56 >Chapter 4. Examples</TD | |
| 57 ><TD | |
| 58 WIDTH="10%" | |
| 59 ALIGN="right" | |
| 60 VALIGN="bottom" | |
| 61 ><A | |
| 62 HREF="guidecdromexamples.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 ><DIV | |
| 72 CLASS="SECT1" | |
| 73 ><H1 | |
| 74 CLASS="SECT1" | |
| 75 ><A | |
| 76 NAME="GUIDEAUDIOEXAMPLES" | |
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77 ></A |
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78 >Audio Examples</H1 |
| 0 | 79 ><P |
| 80 ></P | |
| 81 ><DIV | |
| 82 CLASS="SECT2" | |
| 83 ><H2 | |
| 84 CLASS="SECT2" | |
| 85 ><A | |
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86 NAME="AEN382" |
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87 ></A |
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88 >Opening the audio device</H2 |
| 0 | 89 ><P |
| 90 ><PRE | |
| 91 CLASS="PROGRAMLISTING" | |
| 92 > SDL_AudioSpec wanted; | |
| 93 extern void fill_audio(void *udata, Uint8 *stream, int len); | |
| 94 | |
| 95 /* Set the audio format */ | |
| 96 wanted.freq = 22050; | |
| 97 wanted.format = AUDIO_S16; | |
| 98 wanted.channels = 2; /* 1 = mono, 2 = stereo */ | |
| 99 wanted.samples = 1024; /* Good low-latency value for callback */ | |
| 100 wanted.callback = fill_audio; | |
| 101 wanted.userdata = NULL; | |
| 102 | |
| 103 /* Open the audio device, forcing the desired format */ | |
| 104 if ( SDL_OpenAudio(&wanted, NULL) < 0 ) { | |
| 105 fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError()); | |
| 106 return(-1); | |
| 107 } | |
| 108 return(0);</PRE | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ><DIV | |
| 112 CLASS="SECT2" | |
| 113 ><H2 | |
| 114 CLASS="SECT2" | |
| 115 ><A | |
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116 NAME="AEN386" |
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117 ></A |
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118 >Playing audio</H2 |
| 0 | 119 ><P |
| 120 ><PRE | |
| 121 CLASS="PROGRAMLISTING" | |
| 122 > static Uint8 *audio_chunk; | |
| 123 static Uint32 audio_len; | |
| 124 static Uint8 *audio_pos; | |
| 125 | |
| 126 /* The audio function callback takes the following parameters: | |
| 127 stream: A pointer to the audio buffer to be filled | |
| 128 len: The length (in bytes) of the audio buffer | |
| 129 */ | |
| 130 void fill_audio(void *udata, Uint8 *stream, int len) | |
| 131 { | |
| 132 /* Only play if we have data left */ | |
| 133 if ( audio_len == 0 ) | |
| 134 return; | |
| 135 | |
| 136 /* Mix as much data as possible */ | |
| 137 len = ( len > audio_len ? audio_len : len ); | |
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138 SDL_MixAudio(stream, audio_pos, len, SDL_MIX_MAXVOLUME); |
| 0 | 139 audio_pos += len; |
| 140 audio_len -= len; | |
| 141 } | |
| 142 | |
| 143 /* Load the audio data ... */ | |
| 144 | |
| 145 ;;;;; | |
| 146 | |
| 147 audio_pos = audio_chunk; | |
| 148 | |
| 149 /* Let the callback function play the audio chunk */ | |
| 150 SDL_PauseAudio(0); | |
| 151 | |
| 152 /* Do some processing */ | |
| 153 | |
| 154 ;;;;; | |
| 155 | |
| 156 /* Wait for sound to complete */ | |
| 157 while ( audio_len > 0 ) { | |
| 158 SDL_Delay(100); /* Sleep 1/10 second */ | |
| 159 } | |
| 160 SDL_CloseAudio();</PRE | |
| 161 ></P | |
| 162 ></DIV | |
| 163 ></DIV | |
| 164 ><DIV | |
| 165 CLASS="NAVFOOTER" | |
| 166 ><HR | |
| 167 ALIGN="LEFT" | |
| 168 WIDTH="100%"><TABLE | |
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169 SUMMARY="Footer navigation table" |
| 0 | 170 WIDTH="100%" |
| 171 BORDER="0" | |
| 172 CELLPADDING="0" | |
| 173 CELLSPACING="0" | |
| 174 ><TR | |
| 175 ><TD | |
| 176 WIDTH="33%" | |
| 177 ALIGN="left" | |
| 178 VALIGN="top" | |
| 179 ><A | |
| 180 HREF="guideeventexamples.html" | |
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181 ACCESSKEY="P" |
| 0 | 182 >Prev</A |
| 183 ></TD | |
| 184 ><TD | |
| 185 WIDTH="34%" | |
| 186 ALIGN="center" | |
| 187 VALIGN="top" | |
| 188 ><A | |
| 189 HREF="index.html" | |
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190 ACCESSKEY="H" |
| 0 | 191 >Home</A |
| 192 ></TD | |
| 193 ><TD | |
| 194 WIDTH="33%" | |
| 195 ALIGN="right" | |
| 196 VALIGN="top" | |
| 197 ><A | |
| 198 HREF="guidecdromexamples.html" | |
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199 ACCESSKEY="N" |
| 0 | 200 >Next</A |
| 201 ></TD | |
| 202 ></TR | |
| 203 ><TR | |
| 204 ><TD | |
| 205 WIDTH="33%" | |
| 206 ALIGN="left" | |
| 207 VALIGN="top" | |
| 208 >Event Examples</TD | |
| 209 ><TD | |
| 210 WIDTH="34%" | |
| 211 ALIGN="center" | |
| 212 VALIGN="top" | |
| 213 ><A | |
| 214 HREF="guideexamples.html" | |
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215 ACCESSKEY="U" |
| 0 | 216 >Up</A |
| 217 ></TD | |
| 218 ><TD | |
| 219 WIDTH="33%" | |
| 220 ALIGN="right" | |
| 221 VALIGN="top" | |
| 222 >CDROM Examples</TD | |
| 223 ></TR | |
| 224 ></TABLE | |
| 225 ></DIV | |
| 226 ></BODY | |
| 227 ></HTML | |
| 228 > |