annotate docs/html/sdlaudiocvt.html @ 0:74212992fb08

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author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_AudioCVT</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 1.61
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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_FreeWAV"
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17 HREF="sdlfreewav.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_BuildAudioCVT"
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20 HREF="sdlbuildaudiocvt.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 WIDTH="100%"
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32 BORDER="0"
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33 CELLPADDING="0"
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34 CELLSPACING="0"
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35 ><TR
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36 ><TH
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37 COLSPAN="3"
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38 ALIGN="center"
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39 >SDL Library Documentation</TH
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40 ></TR
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41 ><TR
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42 ><TD
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43 WIDTH="10%"
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44 ALIGN="left"
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45 VALIGN="bottom"
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46 ><A
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47 HREF="sdlfreewav.html"
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48 >Prev</A
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49 ></TD
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50 ><TD
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51 WIDTH="80%"
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52 ALIGN="center"
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53 VALIGN="bottom"
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54 ></TD
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55 ><TD
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56 WIDTH="10%"
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57 ALIGN="right"
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58 VALIGN="bottom"
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59 ><A
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60 HREF="sdlbuildaudiocvt.html"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><H1
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69 ><A
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70 NAME="SDLAUDIOCVT"
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71 >SDL_AudioCVT</A
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72 ></H1
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73 ><DIV
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74 CLASS="REFNAMEDIV"
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75 ><A
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76 NAME="AEN6262"
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77 ></A
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78 ><H2
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79 >Name</H2
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80 >SDL_AudioCVT&nbsp;--&nbsp;Audio Conversion Structure</DIV
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81 ><DIV
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82 CLASS="REFSECT1"
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83 ><A
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84 NAME="AEN6265"
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85 ></A
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86 ><H2
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87 >Structure Definition</H2
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88 ><PRE
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89 CLASS="PROGRAMLISTING"
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90 >typedef struct{
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91 int needed;
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92 Uint16 src_format;
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93 Uint16 dest_format;
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94 double rate_incr;
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95 Uint8 *buf;
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96 int len;
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97 int len_cvt;
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98 int len_mult;
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99 double len_ratio;
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100 void (*filters[10])(struct SDL_AudioCVT *cvt, Uint16 format);
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101 int filter_index;
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102 } SDL_AudioCVT;</PRE
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103 ></DIV
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104 ><DIV
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105 CLASS="REFSECT1"
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106 ><A
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107 NAME="AEN6268"
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108 ></A
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109 ><H2
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110 >Structure Data</H2
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111 ><DIV
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112 CLASS="INFORMALTABLE"
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113 ><A
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114 NAME="AEN6270"
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115 ></A
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116 ><P
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117 ></P
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118 ><TABLE
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119 BORDER="0"
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120 CLASS="CALSTABLE"
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121 ><TBODY
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122 ><TR
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123 ><TD
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124 ALIGN="LEFT"
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125 VALIGN="TOP"
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126 ><TT
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127 CLASS="STRUCTFIELD"
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128 ><I
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129 >needed</I
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130 ></TT
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131 ></TD
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132 ><TD
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133 ALIGN="LEFT"
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134 VALIGN="TOP"
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135 >Set to one if the conversion is possible</TD
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136 ></TR
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137 ><TR
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138 ><TD
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139 ALIGN="LEFT"
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140 VALIGN="TOP"
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141 ><TT
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142 CLASS="STRUCTFIELD"
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143 ><I
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144 >src_format</I
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145 ></TT
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146 ></TD
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147 ><TD
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148 ALIGN="LEFT"
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149 VALIGN="TOP"
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150 >Audio format of the source</TD
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151 ></TR
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152 ><TR
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153 ><TD
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154 ALIGN="LEFT"
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155 VALIGN="TOP"
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156 ><TT
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157 CLASS="STRUCTFIELD"
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158 ><I
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159 >dest_format</I
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160 ></TT
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161 ></TD
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162 ><TD
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163 ALIGN="LEFT"
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164 VALIGN="TOP"
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165 >Audio format of the destination</TD
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166 ></TR
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167 ><TR
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168 ><TD
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169 ALIGN="LEFT"
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170 VALIGN="TOP"
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171 ><TT
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172 CLASS="STRUCTFIELD"
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173 ><I
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174 >rate_incr</I
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175 ></TT
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176 ></TD
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177 ><TD
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178 ALIGN="LEFT"
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179 VALIGN="TOP"
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180 >Rate conversion increment</TD
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181 ></TR
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182 ><TR
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183 ><TD
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184 ALIGN="LEFT"
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185 VALIGN="TOP"
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186 ><TT
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187 CLASS="STRUCTFIELD"
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188 ><I
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189 >buf</I
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190 ></TT
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191 ></TD
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192 ><TD
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193 ALIGN="LEFT"
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194 VALIGN="TOP"
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195 >Audio buffer</TD
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196 ></TR
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197 ><TR
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198 ><TD
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199 ALIGN="LEFT"
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200 VALIGN="TOP"
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201 ><TT
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202 CLASS="STRUCTFIELD"
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203 ><I
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204 >len</I
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205 ></TT
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206 ></TD
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207 ><TD
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208 ALIGN="LEFT"
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209 VALIGN="TOP"
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210 >Length of the original audio buffer in bytes</TD
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211 ></TR
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212 ><TR
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213 ><TD
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214 ALIGN="LEFT"
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215 VALIGN="TOP"
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216 ><TT
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217 CLASS="STRUCTFIELD"
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218 ><I
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219 >len_cvt</I
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220 ></TT
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221 ></TD
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222 ><TD
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223 ALIGN="LEFT"
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224 VALIGN="TOP"
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225 >Length of converted audio buffer in bytes (calculated)</TD
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226 ></TR
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227 ><TR
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228 ><TD
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229 ALIGN="LEFT"
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230 VALIGN="TOP"
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231 ><TT
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232 CLASS="STRUCTFIELD"
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233 ><I
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234 >len_mult</I
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235 ></TT
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236 ></TD
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237 ><TD
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238 ALIGN="LEFT"
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239 VALIGN="TOP"
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240 ><TT
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241 CLASS="STRUCTFIELD"
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242 ><I
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243 >buf</I
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244 ></TT
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245 > must be <TT
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246 CLASS="STRUCTFIELD"
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247 ><I
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248 >len</I
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249 ></TT
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250 >*<TT
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251 CLASS="STRUCTFIELD"
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252 ><I
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253 >len_mult</I
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254 ></TT
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255 > bytes in size(calculated)</TD
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256 ></TR
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257 ><TR
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258 ><TD
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259 ALIGN="LEFT"
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260 VALIGN="TOP"
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261 ><TT
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262 CLASS="STRUCTFIELD"
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263 ><I
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264 >len_ratio</I
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265 ></TT
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266 ></TD
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267 ><TD
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268 ALIGN="LEFT"
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269 VALIGN="TOP"
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270 >Final audio size is <TT
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271 CLASS="STRUCTFIELD"
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272 ><I
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273 >len</I
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274 ></TT
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275 >*<TT
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276 CLASS="STRUCTFIELD"
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277 ><I
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278 >len_ratio</I
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279 ></TT
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280 ></TD
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281 ></TR
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282 ><TR
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283 ><TD
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284 ALIGN="LEFT"
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285 VALIGN="TOP"
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286 ><TT
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287 CLASS="STRUCTFIELD"
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288 ><I
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289 >filters[10](..)</I
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290 ></TT
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291 ></TD
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292 ><TD
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293 ALIGN="LEFT"
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294 VALIGN="TOP"
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295 >Pointers to functions needed for this conversion</TD
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296 ></TR
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297 ><TR
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298 ><TD
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299 ALIGN="LEFT"
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300 VALIGN="TOP"
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301 ><TT
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302 CLASS="STRUCTFIELD"
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303 ><I
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304 >filter_index</I
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305 ></TT
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306 ></TD
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307 ><TD
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308 ALIGN="LEFT"
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309 VALIGN="TOP"
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310 >Current conversion function</TD
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311 ></TR
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312 ></TBODY
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313 ></TABLE
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314 ><P
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315 ></P
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316 ></DIV
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317 ></DIV
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318 ><DIV
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319 CLASS="REFSECT1"
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320 ><A
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321 NAME="AEN6322"
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322 ></A
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323 ><H2
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324 >Description</H2
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325 ><P
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326 >The <SPAN
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327 CLASS="STRUCTNAME"
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328 >SDL_AudioCVT</SPAN
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329 > is used to convert audio data between different formats. A <SPAN
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330 CLASS="STRUCTNAME"
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331 >SDL_AudioCVT</SPAN
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332 > structure is created with the <A
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333 HREF="sdlbuildaudiocvt.html"
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334 ><TT
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335 CLASS="FUNCTION"
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336 >SDL_BuildAudioCVT</TT
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337 ></A
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338 > function, while the actual conversion is done by the <A
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339 HREF="sdlconvertaudio.html"
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340 ><TT
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341 CLASS="FUNCTION"
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342 >SDL_ConvertAudio</TT
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343 ></A
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344 > function.</P
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345 ><P
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346 >Many of the fields in the <SPAN
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347 CLASS="STRUCTNAME"
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348 >SDL_AudioCVT</SPAN
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349 > structure should be considered private and their function will not be discussed here.</P
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350 ><P
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351 ></P
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352 ><DIV
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353 CLASS="VARIABLELIST"
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354 ><DL
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355 ><DT
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356 ><SPAN
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357 CLASS="TYPE"
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358 >Uint8 *</SPAN
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359 ><TT
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360 CLASS="STRUCTFIELD"
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361 ><I
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362 >buf</I
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363 ></TT
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364 ></DT
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365 ><DD
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366 ><P
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367 >This points to the audio data that will be used in the conversion. It is both the source and the destination, which means the converted audio data overwrites the original data. It also means that the converted data may be larger than the original data (if you were converting from 8-bit to 16-bit, for instance), so you must ensure <TT
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368 CLASS="STRUCTFIELD"
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369 ><I
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370 >buf</I
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371 ></TT
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372 > is large enough. See below.</P
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373 ></DD
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374 ><DT
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parents:
diff changeset
375 ><SPAN
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Sam Lantinga <slouken@lokigames.com>
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376 CLASS="TYPE"
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377 >int</SPAN
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378 > <TT
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parents:
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379 CLASS="STRUCTFIELD"
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380 ><I
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381 >len</I
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382 ></TT
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parents:
diff changeset
383 ></DT
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parents:
diff changeset
384 ><DD
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385 ><P
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386 >This is the length of the original audio data in bytes.</P
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387 ></DD
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parents:
diff changeset
388 ><DT
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
389 ><SPAN
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Sam Lantinga <slouken@lokigames.com>
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390 CLASS="TYPE"
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391 >int</SPAN
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392 > <TT
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393 CLASS="STRUCTFIELD"
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394 ><I
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395 >len_mult</I
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Sam Lantinga <slouken@lokigames.com>
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396 ></TT
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
397 ></DT
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
398 ><DD
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parents:
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399 ><P
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400 >As explained above, the audio buffer needs to be big enough to store the converted data, which may be bigger than the original audio data. The length of <TT
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401 CLASS="STRUCTFIELD"
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402 ><I
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Sam Lantinga <slouken@lokigames.com>
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403 >buf</I
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Sam Lantinga <slouken@lokigames.com>
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404 ></TT
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parents:
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405 > should be <TT
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406 CLASS="STRUCTFIELD"
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407 ><I
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408 >len</I
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Sam Lantinga <slouken@lokigames.com>
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409 ></TT
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Sam Lantinga <slouken@lokigames.com>
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410 >*<TT
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411 CLASS="STRUCTFIELD"
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412 ><I
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diff changeset
413 >len_mult</I
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414 ></TT
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Sam Lantinga <slouken@lokigames.com>
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415 >.</P
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Sam Lantinga <slouken@lokigames.com>
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416 ></DD
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 ><DT
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 ><SPAN
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Sam Lantinga <slouken@lokigames.com>
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419 CLASS="TYPE"
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420 >double</SPAN
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
421 > <TT
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422 CLASS="STRUCTFIELD"
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423 ><I
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Sam Lantinga <slouken@lokigames.com>
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424 >len_ratio</I
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425 ></TT
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 ></DT
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 ><DD
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428 ><P
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429 >When you have finished converting your audio data, you need to know how much of your audio buffer is valid. <TT
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430 CLASS="STRUCTFIELD"
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431 ><I
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432 >len</I
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Sam Lantinga <slouken@lokigames.com>
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433 ></TT
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Sam Lantinga <slouken@lokigames.com>
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434 >*<TT
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Sam Lantinga <slouken@lokigames.com>
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435 CLASS="STRUCTFIELD"
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diff changeset
436 ><I
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
437 >len_ratio</I
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Sam Lantinga <slouken@lokigames.com>
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438 ></TT
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439 > is the size of the converted audio data in bytes. This is very similar to <TT
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440 CLASS="STRUCTFIELD"
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441 ><I
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Sam Lantinga <slouken@lokigames.com>
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442 >len_mult</I
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Sam Lantinga <slouken@lokigames.com>
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443 ></TT
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444 >, however when the convert audio data is shorter than the original <TT
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445 CLASS="STRUCTFIELD"
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Sam Lantinga <slouken@lokigames.com>
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446 ><I
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Sam Lantinga <slouken@lokigames.com>
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447 >len_mult</I
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
448 ></TT
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Sam Lantinga <slouken@lokigames.com>
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449 > would be 1. <TT
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Sam Lantinga <slouken@lokigames.com>
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450 CLASS="STRUCTFIELD"
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451 ><I
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
452 >len_ratio</I
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Sam Lantinga <slouken@lokigames.com>
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453 ></TT
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Sam Lantinga <slouken@lokigames.com>
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454 >, on the other hand, would be a fractional number between 0 and 1.</P
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
455 ></DD
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 ></DL
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457 ></DIV
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 ></DIV
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 ><DIV
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 CLASS="REFSECT1"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 ><A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 NAME="AEN6367"
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Sam Lantinga <slouken@lokigames.com>
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463 ></A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464 ><H2
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Sam Lantinga <slouken@lokigames.com>
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465 >See Also</H2
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466 ><P
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467 ><A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 HREF="sdlbuildaudiocvt.html"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
469 ><TT
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470 CLASS="FUNCTION"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471 >SDL_BuildAudioCVT</TT
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 ></A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473 >,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 <A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 HREF="sdlconvertaudio.html"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 ><TT
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477 CLASS="FUNCTION"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478 >SDL_ConvertAudio</TT
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
479 ></A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480 >,
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 <A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482 HREF="sdlaudiospec.html"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 ><SPAN
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484 CLASS="STRUCTNAME"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 >SDL_AudioSpec</SPAN
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486 ></A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 ></P
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488 ></DIV
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 ><DIV
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
490 CLASS="NAVFOOTER"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
491 ><HR
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492 ALIGN="LEFT"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
493 WIDTH="100%"><TABLE
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
494 WIDTH="100%"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 BORDER="0"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 CELLPADDING="0"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497 CELLSPACING="0"
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Sam Lantinga <slouken@lokigames.com>
parents:
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498 ><TR
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499 ><TD
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500 WIDTH="33%"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 ALIGN="left"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502 VALIGN="top"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 ><A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
504 HREF="sdlfreewav.html"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 >Prev</A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506 ></TD
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 ><TD
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 WIDTH="34%"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509 ALIGN="center"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510 VALIGN="top"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
511 ><A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512 HREF="index.html"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513 >Home</A
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
514 ></TD
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
515 ><TD
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
516 WIDTH="33%"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
517 ALIGN="right"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
518 VALIGN="top"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
519 ><A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
520 HREF="sdlbuildaudiocvt.html"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
521 >Next</A
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
522 ></TD
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
523 ></TR
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
524 ><TR
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
525 ><TD
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
526 WIDTH="33%"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527 ALIGN="left"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528 VALIGN="top"
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529 >SDL_FreeWAV</TD
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
530 ><TD
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
531 WIDTH="34%"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
532 ALIGN="center"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
533 VALIGN="top"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
534 ><A
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
535 HREF="audio.html"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536 >Up</A
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
537 ></TD
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
538 ><TD
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
539 WIDTH="33%"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540 ALIGN="right"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
541 VALIGN="top"
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
542 >SDL_BuildAudioCVT</TD
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
543 ></TR
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Sam Lantinga <slouken@lokigames.com>
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544 ></TABLE
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545 ></DIV
74212992fb08 Initial revision
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546 ></BODY
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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547 ></HTML
74212992fb08 Initial revision
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548 >