Mercurial > sdl-ios-xcode
annotate docs/html/sdlmixaudio.html @ 4928:930614179450 SDL-1.2
Patch from Haiku's Google Code-In student Daniel Marth, fixes an off-by-one issue in bwindow.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 03 Dec 2010 16:55:25 -0800 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_MixAudio</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="Audio" | |
14 HREF="audio.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_ConvertAudio" | |
17 HREF="sdlconvertaudio.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_LockAudio" | |
20 HREF="sdllockaudio.html"></HEAD | |
21 ><BODY | |
22 CLASS="REFENTRY" | |
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="sdlconvertaudio.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 ></TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="sdllockaudio.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 ><H1 | |
72 ><A | |
73 NAME="SDLMIXAUDIO" | |
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74 ></A |
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75 >SDL_MixAudio</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN7107" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_MixAudio -- Mix audio data</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN7110" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN7111" |
0 | 95 ></A |
96 ><P | |
97 ></P | |
98 ><PRE | |
99 CLASS="FUNCSYNOPSISINFO" | |
100 >#include "SDL.h"</PRE | |
101 ><P | |
102 ><CODE | |
103 ><CODE | |
104 CLASS="FUNCDEF" | |
105 >void <B | |
106 CLASS="FSFUNC" | |
107 >SDL_MixAudio</B | |
108 ></CODE | |
109 >(Uint8 *dst, Uint8 *src, Uint32 len, int volume);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN7117" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
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123 >This function takes two audio buffers of <TT |
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124 CLASS="PARAMETER" |
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125 ><I |
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126 >len</I |
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127 ></TT |
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128 > bytes each |
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129 of the playing audio format and mixes them, performing addition, volume |
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130 adjustment, and overflow clipping. The <TT |
0 | 131 CLASS="PARAMETER" |
132 ><I | |
133 >volume</I | |
134 ></TT | |
55
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135 > ranges |
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136 from 0 to <TT |
0 | 137 CLASS="LITERAL" |
138 >SDL_MIX_MAXVOLUME</TT | |
55
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139 > and should be set to the maximum |
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140 value for full audio volume. Note this does not change hardware volume. This is |
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141 provided for convenience -- you can mix your own audio data.</P |
181
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142 ><DIV |
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143 CLASS="NOTE" |
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144 ><BLOCKQUOTE |
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145 CLASS="NOTE" |
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146 ><P |
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147 ><B |
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148 >Note: </B |
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149 >Do not use this function for mixing together more than two streams of sample |
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150 data. The output from repeated application of this function may be distorted |
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151 by clipping, because there is no accumulator with greater range than the |
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152 input (not to mention this being an inefficient way of doing it). |
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153 Use mixing functions from SDL_mixer, OpenAL, or write your own mixer instead.</P |
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154 ></BLOCKQUOTE |
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155 ></DIV |
0 | 156 ></DIV |
157 ><DIV | |
158 CLASS="REFSECT1" | |
159 ><A | |
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160 NAME="AEN7125" |
0 | 161 ></A |
162 ><H2 | |
163 >See Also</H2 | |
164 ><P | |
165 ><A | |
166 HREF="sdlopenaudio.html" | |
167 ><TT | |
168 CLASS="FUNCTION" | |
169 >SDL_OpenAudio</TT | |
170 ></A | |
171 ></P | |
172 ></DIV | |
173 ><DIV | |
174 CLASS="NAVFOOTER" | |
175 ><HR | |
176 ALIGN="LEFT" | |
177 WIDTH="100%"><TABLE | |
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178 SUMMARY="Footer navigation table" |
0 | 179 WIDTH="100%" |
180 BORDER="0" | |
181 CELLPADDING="0" | |
182 CELLSPACING="0" | |
183 ><TR | |
184 ><TD | |
185 WIDTH="33%" | |
186 ALIGN="left" | |
187 VALIGN="top" | |
188 ><A | |
189 HREF="sdlconvertaudio.html" | |
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190 ACCESSKEY="P" |
0 | 191 >Prev</A |
192 ></TD | |
193 ><TD | |
194 WIDTH="34%" | |
195 ALIGN="center" | |
196 VALIGN="top" | |
197 ><A | |
198 HREF="index.html" | |
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199 ACCESSKEY="H" |
0 | 200 >Home</A |
201 ></TD | |
202 ><TD | |
203 WIDTH="33%" | |
204 ALIGN="right" | |
205 VALIGN="top" | |
206 ><A | |
207 HREF="sdllockaudio.html" | |
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208 ACCESSKEY="N" |
0 | 209 >Next</A |
210 ></TD | |
211 ></TR | |
212 ><TR | |
213 ><TD | |
214 WIDTH="33%" | |
215 ALIGN="left" | |
216 VALIGN="top" | |
217 >SDL_ConvertAudio</TD | |
218 ><TD | |
219 WIDTH="34%" | |
220 ALIGN="center" | |
221 VALIGN="top" | |
222 ><A | |
223 HREF="audio.html" | |
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224 ACCESSKEY="U" |
0 | 225 >Up</A |
226 ></TD | |
227 ><TD | |
228 WIDTH="33%" | |
229 ALIGN="right" | |
230 VALIGN="top" | |
231 >SDL_LockAudio</TD | |
232 ></TR | |
233 ></TABLE | |
234 ></DIV | |
235 ></BODY | |
236 ></HTML | |
237 > |