annotate docs/html/sdlconvertaudio.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>
date Fri, 03 Dec 2010 16:55:25 -0800
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_ConvertAudio</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="Audio"
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14 HREF="audio.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_BuildAudioCVT"
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17 HREF="sdlbuildaudiocvt.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_MixAudio"
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20 HREF="sdlmixaudio.html"></HEAD
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21 ><BODY
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22 CLASS="REFENTRY"
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23 BGCOLOR="#FFF8DC"
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24 TEXT="#000000"
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25 LINK="#0000ee"
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26 VLINK="#551a8b"
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="sdlbuildaudiocvt.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 ></TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="sdlmixaudio.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><H1
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72 ><A
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73 NAME="SDLCONVERTAUDIO"
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74 ></A
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75 >SDL_ConvertAudio</H1
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76 ><DIV
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77 CLASS="REFNAMEDIV"
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78 ><A
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79 NAME="AEN7048"
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80 ></A
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81 ><H2
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82 >Name</H2
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83 >SDL_ConvertAudio&nbsp;--&nbsp;Convert audio data to a desired audio format.</DIV
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84 ><DIV
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85 CLASS="REFSYNOPSISDIV"
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86 ><A
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87 NAME="AEN7051"
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88 ></A
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89 ><H2
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90 >Synopsis</H2
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91 ><DIV
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92 CLASS="FUNCSYNOPSIS"
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93 ><A
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94 NAME="AEN7052"
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95 ></A
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96 ><P
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97 ></P
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98 ><PRE
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99 CLASS="FUNCSYNOPSISINFO"
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100 >#include "SDL.h"</PRE
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101 ><P
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102 ><CODE
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103 ><CODE
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104 CLASS="FUNCDEF"
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105 >int <B
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106 CLASS="FSFUNC"
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107 >SDL_ConvertAudio</B
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108 ></CODE
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109 >(SDL_AudioCVT *cvt);</CODE
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110 ></P
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111 ><P
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112 ></P
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113 ></DIV
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114 ></DIV
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115 ><DIV
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116 CLASS="REFSECT1"
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117 ><A
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118 NAME="AEN7058"
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119 ></A
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120 ><H2
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121 >Description</H2
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122 ><P
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123 ><TT
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124 CLASS="FUNCTION"
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125 >SDL_ConvertAudio</TT
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126 > takes one parameter, <TT
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127 CLASS="PARAMETER"
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128 ><I
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129 >cvt</I
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130 ></TT
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131 >, which was previously initilized. Initilizing a <A
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132 HREF="sdlaudiocvt.html"
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133 ><SPAN
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134 CLASS="STRUCTNAME"
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135 >SDL_AudioCVT</SPAN
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136 ></A
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137 > is a two step process. First of all, the structure must be passed to <A
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138 HREF="sdlbuildaudiocvt.html"
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139 ><TT
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140 CLASS="FUNCTION"
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141 >SDL_BuildAudioCVT</TT
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142 ></A
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143 > along with source and destination format parameters. Secondly, the <SPAN
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144 CLASS="STRUCTNAME"
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145 >cvt</SPAN
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146 >-&#62;<TT
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147 CLASS="STRUCTFIELD"
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148 ><I
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149 >buf</I
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150 ></TT
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151 > and <SPAN
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152 CLASS="STRUCTNAME"
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153 >cvt</SPAN
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154 >-&#62;<TT
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155 CLASS="STRUCTFIELD"
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156 ><I
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157 >len</I
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158 ></TT
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159 > fields must be setup. <SPAN
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160 CLASS="STRUCTNAME"
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161 >cvt</SPAN
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162 >-&#62;<TT
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163 CLASS="STRUCTFIELD"
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164 ><I
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165 >buf</I
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166 ></TT
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167 > should point to the audio data and <SPAN
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168 CLASS="STRUCTNAME"
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169 >cvt</SPAN
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170 >-&#62;<TT
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171 CLASS="STRUCTFIELD"
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172 ><I
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173 >len</I
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174 ></TT
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175 > should be set to the length of the audio data in bytes. Remember, the length of the buffer pointed to by <TT
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176 CLASS="STRUCTFIELD"
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177 ><I
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178 >buf</I
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179 ></TT
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180 > show be <TT
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181 CLASS="STRUCTFIELD"
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182 ><I
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183 >len</I
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184 ></TT
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185 >*<TT
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186 CLASS="STRUCTFIELD"
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187 ><I
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188 >len_mult</I
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189 ></TT
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190 > bytes in length.</P
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191 ><P
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192 >Once the <SPAN
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193 CLASS="STRUCTNAME"
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194 >SDL_AudioCVT</SPAN
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195 >structure is initilized then we can pass it to <TT
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196 CLASS="FUNCTION"
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197 >SDL_ConvertAudio</TT
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198 >, which will convert the audio data pointer to by <SPAN
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199 CLASS="STRUCTNAME"
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200 >cvt</SPAN
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201 >-&#62;<TT
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202 CLASS="STRUCTFIELD"
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203 ><I
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204 >buf</I
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205 ></TT
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206 >. If <TT
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207 CLASS="FUNCTION"
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208 >SDL_ConvertAudio</TT
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209 > returned <SPAN
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210 CLASS="RETURNVALUE"
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211 >0</SPAN
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212 > then the conversion was completed successfully, otherwise <SPAN
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213 CLASS="RETURNVALUE"
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214 >-1</SPAN
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215 > is returned.</P
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216 ><P
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217 >If the conversion completed successfully then the converted audio data can be read from <SPAN
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218 CLASS="STRUCTNAME"
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219 >cvt</SPAN
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220 >-&#62;<TT
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221 CLASS="STRUCTFIELD"
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222 ><I
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223 >buf</I
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224 ></TT
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225 >. The amount of valid, converted, audio data in the buffer is equal to <SPAN
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226 CLASS="STRUCTNAME"
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227 >cvt</SPAN
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228 >-&#62;<TT
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229 CLASS="STRUCTFIELD"
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230 ><I
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231 >len</I
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232 ></TT
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233 >*<TT
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234 CLASS="STRUCTFIELD"
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235 ><I
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236 >cvt</I
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237 ></TT
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238 >-&#62;<SPAN
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239 CLASS="STRUCTNAME"
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240 >len_ratio</SPAN
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241 >.</P
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242 ></DIV
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243 ><DIV
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244 CLASS="REFSECT1"
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245 ><A
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246 NAME="AEN7093"
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247 ></A
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248 ><H2
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249 >Examples</H2
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250 ><PRE
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251 CLASS="PROGRAMLISTING"
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252 >/* Converting some WAV data to hardware format */
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253 void my_audio_callback(void *userdata, Uint8 *stream, int len);
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254
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255 SDL_AudioSpec *desired, *obtained;
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256 SDL_AudioSpec wav_spec;
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257 SDL_AudioCVT wav_cvt;
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258 Uint32 wav_len;
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259 Uint8 *wav_buf;
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260 int ret;
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261
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262 /* Allocated audio specs */
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263 desired = malloc(sizeof(SDL_AudioSpec));
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264 obtained = malloc(sizeof(SDL_AudioSpec));
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265
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266 /* Set desired format */
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267 desired-&#62;freq=22050;
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268 desired-&#62;format=AUDIO_S16LSB;
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269 desired-&#62;samples=8192;
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270 desired-&#62;callback=my_audio_callback;
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271 desired-&#62;userdata=NULL;
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272
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273 /* Open the audio device */
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274 if ( SDL_OpenAudio(desired, obtained) &#60; 0 ){
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275 fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
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276 exit(-1);
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277 }
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278
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279 free(desired);
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280
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281 /* Load the test.wav */
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282 if( SDL_LoadWAV("test.wav", &#38;wav_spec, &#38;wav_buf, &#38;wav_len) == NULL ){
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283 fprintf(stderr, "Could not open test.wav: %s\n", SDL_GetError());
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284 SDL_CloseAudio();
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285 free(obtained);
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286 exit(-1);
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287 }
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288
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289 /* Build AudioCVT */
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290 ret = SDL_BuildAudioCVT(&#38;wav_cvt,
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291 wav_spec.format, wav_spec.channels, wav_spec.freq,
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292 obtained-&#62;format, obtained-&#62;channels, obtained-&#62;freq);
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293
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294 /* Check that the convert was built */
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295 if(ret==-1){
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296 fprintf(stderr, "Couldn't build converter!\n");
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297 SDL_CloseAudio();
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298 free(obtained);
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299 SDL_FreeWAV(wav_buf);
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300 }
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301
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302 /* Setup for conversion */
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303 wav_cvt.buf = malloc(wav_len * wav_cvt.len_mult);
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304 wav_cvt.len = wav_len;
0
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305 memcpy(wav_cvt.buf, wav_buf, wav_len);
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306
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307 /* We can delete to original WAV data now */
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308 SDL_FreeWAV(wav_buf);
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309
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310 /* And now we're ready to convert */
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311 SDL_ConvertAudio(&#38;wav_cvt);
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312
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313 /* do whatever */
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314 .
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315 .
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316 .
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317 .
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318 &#13;</PRE
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319 ></DIV
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320 ><DIV
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321 CLASS="REFSECT1"
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322 ><A
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323 NAME="AEN7096"
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324 ></A
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325 ><H2
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326 >See Also</H2
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327 ><P
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328 ><A
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329 HREF="sdlbuildaudiocvt.html"
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330 ><TT
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331 CLASS="FUNCTION"
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332 >SDL_BuildAudioCVT</TT
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333 ></A
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334 >,
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335 <A
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336 HREF="sdlaudiocvt.html"
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337 ><TT
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338 CLASS="FUNCTION"
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339 >SDL_AudioCVT</TT
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340 ></A
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341 ></P
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342 ></DIV
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343 ><DIV
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344 CLASS="NAVFOOTER"
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345 ><HR
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346 ALIGN="LEFT"
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347 WIDTH="100%"><TABLE
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348 SUMMARY="Footer navigation table"
0
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349 WIDTH="100%"
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350 BORDER="0"
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351 CELLPADDING="0"
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352 CELLSPACING="0"
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353 ><TR
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354 ><TD
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355 WIDTH="33%"
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356 ALIGN="left"
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357 VALIGN="top"
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358 ><A
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359 HREF="sdlbuildaudiocvt.html"
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360 ACCESSKEY="P"
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361 >Prev</A
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362 ></TD
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363 ><TD
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364 WIDTH="34%"
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365 ALIGN="center"
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366 VALIGN="top"
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367 ><A
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368 HREF="index.html"
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369 ACCESSKEY="H"
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370 >Home</A
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371 ></TD
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372 ><TD
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373 WIDTH="33%"
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374 ALIGN="right"
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375 VALIGN="top"
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376 ><A
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377 HREF="sdlmixaudio.html"
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378 ACCESSKEY="N"
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379 >Next</A
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380 ></TD
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381 ></TR
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382 ><TR
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383 ><TD
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384 WIDTH="33%"
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385 ALIGN="left"
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386 VALIGN="top"
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387 >SDL_BuildAudioCVT</TD
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388 ><TD
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389 WIDTH="34%"
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390 ALIGN="center"
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391 VALIGN="top"
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392 ><A
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393 HREF="audio.html"
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394 ACCESSKEY="U"
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395 >Up</A
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396 ></TD
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397 ><TD
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398 WIDTH="33%"
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399 ALIGN="right"
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400 VALIGN="top"
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401 >SDL_MixAudio</TD
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402 ></TR
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403 ></TABLE
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404 ></DIV
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405 ></BODY
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406 ></HTML
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407 >