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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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children 55f1f1b3e27d
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-1:000000000000 0:74212992fb08
1 <HTML
2 ><HEAD
3 ><TITLE
4 >Audio</TITLE
5 ><META
6 NAME="GENERATOR"
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
8 "><LINK
9 REL="HOME"
10 TITLE="SDL Library Documentation"
11 HREF="index.html"><LINK
12 REL="UP"
13 TITLE="SDL Reference"
14 HREF="reference.html"><LINK
15 REL="PREVIOUS"
16 TITLE="SDL_JoystickClose"
17 HREF="sdljoystickclose.html"><LINK
18 REL="NEXT"
19 TITLE="SDL_AudioSpec"
20 HREF="sdlaudiospec.html"><META
21 NAME="KEYWORD"
22 CONTENT="audio"><META
23 NAME="KEYWORD"
24 CONTENT="function"></HEAD
25 ><BODY
26 CLASS="CHAPTER"
27 BGCOLOR="#FFF8DC"
28 TEXT="#000000"
29 LINK="#0000ee"
30 VLINK="#551a8b"
31 ALINK="#ff0000"
32 ><DIV
33 CLASS="NAVHEADER"
34 ><TABLE
35 WIDTH="100%"
36 BORDER="0"
37 CELLPADDING="0"
38 CELLSPACING="0"
39 ><TR
40 ><TH
41 COLSPAN="3"
42 ALIGN="center"
43 >SDL Library Documentation</TH
44 ></TR
45 ><TR
46 ><TD
47 WIDTH="10%"
48 ALIGN="left"
49 VALIGN="bottom"
50 ><A
51 HREF="sdljoystickclose.html"
52 >Prev</A
53 ></TD
54 ><TD
55 WIDTH="80%"
56 ALIGN="center"
57 VALIGN="bottom"
58 ></TD
59 ><TD
60 WIDTH="10%"
61 ALIGN="right"
62 VALIGN="bottom"
63 ><A
64 HREF="sdlaudiospec.html"
65 >Next</A
66 ></TD
67 ></TR
68 ></TABLE
69 ><HR
70 ALIGN="LEFT"
71 WIDTH="100%"></DIV
72 ><DIV
73 CLASS="CHAPTER"
74 ><H1
75 ><A
76 NAME="AUDIO"
77 >Chapter 10. Audio</A
78 ></H1
79 ><DIV
80 CLASS="TOC"
81 ><DL
82 ><DT
83 ><B
84 >Table of Contents</B
85 ></DT
86 ><DT
87 ><A
88 HREF="sdlaudiospec.html"
89 >SDL_AudioSpec</A
90 > &#8212; Audio Specification Structure</DT
91 ><DT
92 ><A
93 HREF="sdlopenaudio.html"
94 >SDL_OpenAudio</A
95 > &#8212; Opens the audio device with the desired parameters.</DT
96 ><DT
97 ><A
98 HREF="sdlpauseaudio.html"
99 >SDL_PauseAudio</A
100 > &#8212; Pauses and unpauses the audio callback processing</DT
101 ><DT
102 ><A
103 HREF="sdlgetaudiostatus.html"
104 >SDL_GetAudioStatus</A
105 > &#8212; Get the current audio state</DT
106 ><DT
107 ><A
108 HREF="sdlloadwav.html"
109 >SDL_LoadWAV</A
110 > &#8212; Load a WAVE file</DT
111 ><DT
112 ><A
113 HREF="sdlfreewav.html"
114 >SDL_FreeWAV</A
115 > &#8212; Frees previously opened WAV data</DT
116 ><DT
117 ><A
118 HREF="sdlaudiocvt.html"
119 >SDL_AudioCVT</A
120 > &#8212; Audio Conversion Structure</DT
121 ><DT
122 ><A
123 HREF="sdlbuildaudiocvt.html"
124 >SDL_BuildAudioCVT</A
125 > &#8212; Initializes a SDL_AudioCVT structure for conversion</DT
126 ><DT
127 ><A
128 HREF="sdlconvertaudio.html"
129 >SDL_ConvertAudio</A
130 > &#8212; Convert audio data to a desired audio format.</DT
131 ><DT
132 ><A
133 HREF="sdlmixaudio.html"
134 >SDL_MixAudio</A
135 > &#8212; Mix audio data</DT
136 ><DT
137 ><A
138 HREF="sdllockaudio.html"
139 >SDL_LockAudio</A
140 > &#8212; Lock out the callback function</DT
141 ><DT
142 ><A
143 HREF="sdlunlockaudio.html"
144 >SDL_UnlockAudio</A
145 > &#8212; Unlock the callback function</DT
146 ><DT
147 ><A
148 HREF="sdlcloseaudio.html"
149 >SDL_CloseAudio</A
150 > &#8212; Shuts down audio processing and closes the audio device.</DT
151 ></DL
152 ></DIV
153 ><P
154 >Sound on the computer is translated from waves that you hear into a series of
155 values, or samples, each representing the amplitude of the wave. When these
156 samples are sent in a stream to a sound card, an approximation of the original
157 wave can be recreated. The more bits used to represent the amplitude, and the
158 greater frequency these samples are gathered, the closer the approximated
159 sound is to the original, and the better the quality of sound.</P
160 ><P
161 >This library supports both 8 and 16 bit signed and unsigned sound samples,
162 at frequencies ranging from 11025 Hz to 44100 Hz, depending on the
163 underlying hardware. If the hardware doesn't support the desired audio
164 format or frequency, it can be emulated if desired (See
165 <A
166 HREF="sdlopenaudio.html"
167 ><TT
168 CLASS="FUNCTION"
169 >SDL_OpenAudio()</TT
170 ></A
171 >)</P
172 ><P
173 >A commonly supported audio format is 16 bits per sample at 22050 Hz.</P
174 ></DIV
175 ><DIV
176 CLASS="NAVFOOTER"
177 ><HR
178 ALIGN="LEFT"
179 WIDTH="100%"><TABLE
180 WIDTH="100%"
181 BORDER="0"
182 CELLPADDING="0"
183 CELLSPACING="0"
184 ><TR
185 ><TD
186 WIDTH="33%"
187 ALIGN="left"
188 VALIGN="top"
189 ><A
190 HREF="sdljoystickclose.html"
191 >Prev</A
192 ></TD
193 ><TD
194 WIDTH="34%"
195 ALIGN="center"
196 VALIGN="top"
197 ><A
198 HREF="index.html"
199 >Home</A
200 ></TD
201 ><TD
202 WIDTH="33%"
203 ALIGN="right"
204 VALIGN="top"
205 ><A
206 HREF="sdlaudiospec.html"
207 >Next</A
208 ></TD
209 ></TR
210 ><TR
211 ><TD
212 WIDTH="33%"
213 ALIGN="left"
214 VALIGN="top"
215 >SDL_JoystickClose</TD
216 ><TD
217 WIDTH="34%"
218 ALIGN="center"
219 VALIGN="top"
220 ><A
221 HREF="reference.html"
222 >Up</A
223 ></TD
224 ><TD
225 WIDTH="33%"
226 ALIGN="right"
227 VALIGN="top"
228 >SDL_AudioSpec</TD
229 ></TR
230 ></TABLE
231 ></DIV
232 ></BODY
233 ></HTML
234 >