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annotate docs/html/audio.html @ 1239:cbdb2c156aca

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author Patrice Mandin <patmandin@gmail.com>
date Sun, 08 Jan 2006 17:29:19 +0000
parents 355632dca928
children
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >Audio</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="SDL Reference"
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14 HREF="reference.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_JoystickClose"
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17 HREF="sdljoystickclose.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_AudioSpec"
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20 HREF="sdlaudiospec.html"><META
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21 NAME="KEYWORD"
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22 CONTENT="audio"><META
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23 NAME="KEYWORD"
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24 CONTENT="function"></HEAD
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25 ><BODY
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26 CLASS="CHAPTER"
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27 BGCOLOR="#FFF8DC"
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28 TEXT="#000000"
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29 LINK="#0000ee"
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30 VLINK="#551a8b"
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31 ALINK="#ff0000"
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32 ><DIV
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33 CLASS="NAVHEADER"
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34 ><TABLE
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35 SUMMARY="Header navigation table"
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36 WIDTH="100%"
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37 BORDER="0"
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38 CELLPADDING="0"
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39 CELLSPACING="0"
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40 ><TR
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41 ><TH
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42 COLSPAN="3"
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43 ALIGN="center"
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44 >SDL Library Documentation</TH
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45 ></TR
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46 ><TR
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47 ><TD
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48 WIDTH="10%"
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49 ALIGN="left"
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50 VALIGN="bottom"
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51 ><A
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52 HREF="sdljoystickclose.html"
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53 ACCESSKEY="P"
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54 >Prev</A
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55 ></TD
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56 ><TD
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57 WIDTH="80%"
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58 ALIGN="center"
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59 VALIGN="bottom"
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60 ></TD
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61 ><TD
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62 WIDTH="10%"
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63 ALIGN="right"
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64 VALIGN="bottom"
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65 ><A
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66 HREF="sdlaudiospec.html"
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67 ACCESSKEY="N"
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68 >Next</A
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69 ></TD
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70 ></TR
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71 ></TABLE
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72 ><HR
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73 ALIGN="LEFT"
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74 WIDTH="100%"></DIV
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75 ><DIV
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76 CLASS="CHAPTER"
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77 ><H1
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78 ><A
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79 NAME="AUDIO"
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80 ></A
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81 >Chapter 10. Audio</H1
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82 ><DIV
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83 CLASS="TOC"
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84 ><DL
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85 ><DT
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86 ><B
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87 >Table of Contents</B
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88 ></DT
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89 ><DT
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90 ><A
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91 HREF="sdlaudiospec.html"
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92 >SDL_AudioSpec</A
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93 >&nbsp;--&nbsp;Audio Specification Structure</DT
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94 ><DT
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95 ><A
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96 HREF="sdlopenaudio.html"
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97 >SDL_OpenAudio</A
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98 >&nbsp;--&nbsp;Opens the audio device with the desired parameters.</DT
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99 ><DT
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100 ><A
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101 HREF="sdlpauseaudio.html"
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102 >SDL_PauseAudio</A
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103 >&nbsp;--&nbsp;Pauses and unpauses the audio callback processing</DT
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104 ><DT
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105 ><A
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106 HREF="sdlgetaudiostatus.html"
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107 >SDL_GetAudioStatus</A
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108 >&nbsp;--&nbsp;Get the current audio state</DT
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109 ><DT
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110 ><A
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111 HREF="sdlloadwav.html"
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112 >SDL_LoadWAV</A
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113 >&nbsp;--&nbsp;Load a WAVE file</DT
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114 ><DT
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115 ><A
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116 HREF="sdlfreewav.html"
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117 >SDL_FreeWAV</A
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118 >&nbsp;--&nbsp;Frees previously opened WAV data</DT
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119 ><DT
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120 ><A
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121 HREF="sdlaudiocvt.html"
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122 >SDL_AudioCVT</A
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123 >&nbsp;--&nbsp;Audio Conversion Structure</DT
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124 ><DT
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125 ><A
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126 HREF="sdlbuildaudiocvt.html"
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127 >SDL_BuildAudioCVT</A
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128 >&nbsp;--&nbsp;Initializes a SDL_AudioCVT structure for conversion</DT
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129 ><DT
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130 ><A
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131 HREF="sdlconvertaudio.html"
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132 >SDL_ConvertAudio</A
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133 >&nbsp;--&nbsp;Convert audio data to a desired audio format.</DT
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134 ><DT
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135 ><A
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136 HREF="sdlmixaudio.html"
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137 >SDL_MixAudio</A
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138 >&nbsp;--&nbsp;Mix audio data</DT
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139 ><DT
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140 ><A
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141 HREF="sdllockaudio.html"
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142 >SDL_LockAudio</A
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143 >&nbsp;--&nbsp;Lock out the callback function</DT
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144 ><DT
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145 ><A
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146 HREF="sdlunlockaudio.html"
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147 >SDL_UnlockAudio</A
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148 >&nbsp;--&nbsp;Unlock the callback function</DT
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149 ><DT
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150 ><A
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151 HREF="sdlcloseaudio.html"
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152 >SDL_CloseAudio</A
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153 >&nbsp;--&nbsp;Shuts down audio processing and closes the audio device.</DT
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154 ></DL
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155 ></DIV
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156 ><P
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157 >Sound on the computer is translated from waves that you hear into a series of
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158 values, or samples, each representing the amplitude of the wave. When these
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159 samples are sent in a stream to a sound card, an approximation of the original
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160 wave can be recreated. The more bits used to represent the amplitude, and the
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161 greater frequency these samples are gathered, the closer the approximated
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162 sound is to the original, and the better the quality of sound.</P
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163 ><P
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164 >This library supports both 8 and 16 bit signed and unsigned sound samples,
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165 at frequencies ranging from 11025 Hz to 44100 Hz, depending on the
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166 underlying hardware. If the hardware doesn't support the desired audio
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167 format or frequency, it can be emulated if desired (See
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168 <A
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169 HREF="sdlopenaudio.html"
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170 ><TT
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171 CLASS="FUNCTION"
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172 >SDL_OpenAudio()</TT
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173 ></A
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174 >)</P
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175 ><P
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176 >A commonly supported audio format is 16 bits per sample at 22050 Hz.</P
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177 ></DIV
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178 ><DIV
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179 CLASS="NAVFOOTER"
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180 ><HR
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181 ALIGN="LEFT"
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182 WIDTH="100%"><TABLE
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183 SUMMARY="Footer navigation table"
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184 WIDTH="100%"
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185 BORDER="0"
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186 CELLPADDING="0"
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187 CELLSPACING="0"
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188 ><TR
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189 ><TD
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190 WIDTH="33%"
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191 ALIGN="left"
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192 VALIGN="top"
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193 ><A
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194 HREF="sdljoystickclose.html"
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195 ACCESSKEY="P"
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196 >Prev</A
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197 ></TD
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198 ><TD
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199 WIDTH="34%"
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200 ALIGN="center"
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201 VALIGN="top"
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202 ><A
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203 HREF="index.html"
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204 ACCESSKEY="H"
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205 >Home</A
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206 ></TD
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207 ><TD
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208 WIDTH="33%"
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209 ALIGN="right"
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210 VALIGN="top"
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211 ><A
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212 HREF="sdlaudiospec.html"
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213 ACCESSKEY="N"
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214 >Next</A
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215 ></TD
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216 ></TR
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217 ><TR
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218 ><TD
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219 WIDTH="33%"
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220 ALIGN="left"
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221 VALIGN="top"
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222 >SDL_JoystickClose</TD
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223 ><TD
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224 WIDTH="34%"
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225 ALIGN="center"
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226 VALIGN="top"
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227 ><A
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228 HREF="reference.html"
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229 ACCESSKEY="U"
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230 >Up</A
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231 ></TD
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232 ><TD
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233 WIDTH="33%"
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234 ALIGN="right"
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235 VALIGN="top"
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236 >SDL_AudioSpec</TD
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237 ></TR
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238 ></TABLE
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239 ></DIV
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240 ></BODY
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241 ></HTML
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242 >