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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>audio/G726.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.4 --><div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="annotated.html">Class List</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Class Members</a> | <a class="qindex" href="globals.html">File Members</a></div><div class="nav"><a class="el" href="dir_000000.html">audio</a></div><h1>G726.cpp</h1><a href="G726_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="common_8h.html">common.h</a>"</span><a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="G726_8h.html">G726.h</a>"</span><a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="G711_8h.html">G711.h</a>"</span><a name="l00028"></a>00028 <a name="l00049"></a><a class="code" href="group__g726__section4m.html#ga0">00049</a> <span class="preprocessor">#define CHECK_SM(x,bits) ASSERT_DEBUG(((x)>>bits)==0)</span><a name="l00050"></a>00050 <span class="preprocessor"></span><a name="l00056"></a><a class="code" href="group__g726__section4m.html#ga1">00056</a> <span class="preprocessor">#define CHECK_UM(x,bits) ASSERT_DEBUG(((x)>>bits)==0)</span><a name="l00057"></a>00057 <span class="preprocessor"></span><a name="l00063"></a><a class="code" href="group__g726__section4m.html#ga2">00063</a> <span class="preprocessor">#define CHECK_TC(x,bits) ASSERT_DEBUG(((x)>>(bits-1))==((x)<0?-1:0))</span><a name="l00064"></a>00064 <span class="preprocessor"></span><a name="l00070"></a><a class="code" href="group__g726__section4m.html#ga3">00070</a> <span class="preprocessor">#define CHECK_FL(x,bits) ASSERT_DEBUG(((x)>>bits)==0)</span><a name="l00071"></a>00071 <span class="preprocessor"></span><a name="l00077"></a><a class="code" href="group__g726__section4m.html#ga4">00077</a> <span class="preprocessor">#define CHECK_UNSIGNED(x,bits) ASSERT_DEBUG(((x)>>bits)==0)</span><a name="l00078"></a>00078 <span class="preprocessor"></span> <span class="comment">// End of group</span><a name="l00080"></a>00080 <a name="l00081"></a>00081 <a name="l00085"></a><a class="code" href="G726_8cpp.html#a5">00085</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="G726_8cpp.html#a5">EXPAND</a>(<a class="code" href="group__integers.html#ga6">uint</a> S,<a class="code" href="group__integers.html#ga6">uint</a> LAW,<span class="keywordtype">int</span>& SL)<a name="l00086"></a>00086 {<a name="l00087"></a>00087 <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(S,8);<a name="l00088"></a>00088 <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(LAW,1);<a name="l00089"></a>00089 <span class="keywordtype">int</span> linear;<a name="l00090"></a>00090 <span class="keywordflow">if</span>(LAW)<a name="l00091"></a>00091 linear = <a class="code" href="classG711.html#e1">G711::ALawDecode</a>(S);<a name="l00092"></a>00092 <span class="keywordflow">else</span><a name="l00093"></a>00093 linear = <a class="code" href="classG711.html#e3">G711::ULawDecode</a>(S);<a name="l00094"></a>00094 SL = linear>>2;<a name="l00095"></a>00095 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(SL,14);<a name="l00096"></a>00096 }<a name="l00097"></a>00097 <a name="l00098"></a>00098 <a name="l00102"></a><a class="code" href="group__g726__section4.html#ga0">00102</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga0">SUBTA</a>(<span class="keywordtype">int</span> SL,<span class="keywordtype">int</span> SE,<span class="keywordtype">int</span>& D)<a name="l00103"></a>00103 {<a name="l00104"></a>00104 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(SL,14);<a name="l00105"></a>00105 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(SE,15);<a name="l00106"></a>00106 D = SL-SE;<a name="l00107"></a>00107 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(D,16);<a name="l00108"></a>00108 }<a name="l00109"></a>00109 <a name="l00110"></a>00110 <a name="l00114"></a><a class="code" href="group__g726__section4.html#ga1">00114</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga1">LOG</a>(<span class="keywordtype">int</span> D,<a class="code" href="group__integers.html#ga6">uint</a>& DL,<span class="keywordtype">int</span>& DS)<a name="l00115"></a>00115 {<a name="l00116"></a>00116 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(D,16);<a name="l00117"></a>00117 <a name="l00118"></a>00118 DS = D>>15;<a name="l00119"></a>00119 <a name="l00120"></a>00120 <a class="code" href="group__integers.html#ga6">uint</a> DQM = (D<0) ? -D : D;<a name="l00121"></a>00121 DQM &= 0x7fff;<a name="l00122"></a>00122 <a name="l00123"></a>00123 <a class="code" href="group__integers.html#ga6">uint</a> EXP = 0;<a name="l00124"></a>00124 <a class="code" href="group__integers.html#ga6">uint</a> x = DQM;<a name="l00125"></a>00125 <span class="keywordflow">if</span>(x>=(1<<8))<a name="l00126"></a>00126 {<a name="l00127"></a>00127 EXP |= 8;<a name="l00128"></a>00128 x >>= 8;<a name="l00129"></a>00129 }<a name="l00130"></a>00130 <span class="keywordflow">if</span>(x>=(1<<4))<a name="l00131"></a>00131 {<a name="l00132"></a>00132 EXP |= 4;<a name="l00133"></a>00133 x >>= 4;<a name="l00134"></a>00134 }<a name="l00135"></a>00135 <span class="keywordflow">if</span>(x>=(1<<2))<a name="l00136"></a>00136 {<a name="l00137"></a>00137 EXP |= 2;<a name="l00138"></a>00138 x >>= 2;<a name="l00139"></a>00139 }<a name="l00140"></a>00140 EXP |= x>>1;<a name="l00141"></a>00141 <a name="l00142"></a>00142 <a class="code" href="group__integers.html#ga6">uint</a> MANT = ((DQM<<7)>>EXP)&0x7f;<a name="l00143"></a>00143 DL = (EXP<<7) + MANT;<a name="l00144"></a>00144 <a name="l00145"></a>00145 <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(DL,11);<a name="l00146"></a>00146 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DS,1);<a name="l00147"></a>00147 }<a name="l00148"></a>00148 <a name="l00149"></a>00149 <a name="l00153"></a><a class="code" href="group__g726__section4.html#ga2">00153</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga2">QUAN</a>(<a class="code" href="group__integers.html#ga6">uint</a> RATE,<span class="keywordtype">int</span> DLN,<span class="keywordtype">int</span> DS,<a class="code" href="group__integers.html#ga6">uint</a>& I)<a name="l00154"></a>00154 {<a name="l00155"></a>00155 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DLN,12);<a name="l00156"></a>00156 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DS,1);<a name="l00157"></a>00157 <a name="l00158"></a>00158 <span class="keywordtype">int</span> x;<a name="l00159"></a>00159 <a name="l00160"></a>00160 <span class="keywordflow">if</span>(RATE==2)<a name="l00161"></a>00161 x = (DLN>=261);<a name="l00162"></a>00162 <span class="keywordflow">else</span><a name="l00163"></a>00163 {<a name="l00164"></a>00164 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> quan3[4] = {8,218,331,0x7fff};<a name="l00165"></a>00165 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> quan4[8] = {3972-0x1000,80,178,246,300,349,400,0x7fff};<a name="l00166"></a>00166 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> quan5[16] = {3974-0x1000,4080-0x1000,68,139,198,250,298,339,378,413,445,475,502,528,553,0x7fff};<a name="l00167"></a>00167 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a>* <span class="keyword">const</span> quan[3] = {quan3,quan4,quan5};<a name="l00168"></a>00168 <a name="l00169"></a>00169 <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a>* levels = quan[RATE-3];<a name="l00170"></a>00170 <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a>* levels0 = levels;<a name="l00171"></a>00171 <a name="l00172"></a>00172 <span class="keywordflow">while</span>(DLN>=*levels++) {}<a name="l00173"></a>00173 <a name="l00174"></a>00174 x = levels-levels0-1;<a name="l00175"></a>00175 <span class="keywordflow">if</span>(!x)<a name="l00176"></a>00176 x = ~DS;<a name="l00177"></a>00177 }<a name="l00178"></a>00178 <span class="keywordtype">int</span> mask = (1<<RATE)-1;<a name="l00179"></a>00179 I = (x^DS)&mask;<a name="l00180"></a>00180 <a name="l00181"></a>00181 <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(I,RATE);<a name="l00182"></a>00182 }<a name="l00183"></a>00183 <a name="l00184"></a>00184 <a name="l00188"></a><a class="code" href="group__g726__section4.html#ga3">00188</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga3">SUBTB</a>(<a class="code" href="group__integers.html#ga6">uint</a> DL,<a class="code" href="group__integers.html#ga6">uint</a> Y,<span class="keywordtype">int</span>& DLN)<a name="l00189"></a>00189 {<a name="l00190"></a>00190 <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(DL,11);<a name="l00191"></a>00191 <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(Y,13);<a name="l00192"></a>00192 DLN = DL-(Y>>2);<a name="l00193"></a>00193 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DLN,12);<a name="l00194"></a>00194 }<a name="l00195"></a>00195 <a name="l00196"></a>00196 <a name="l00200"></a><a class="code" href="group__g726__section4.html#ga4">00200</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga4">ADDA</a>(<span class="keywordtype">int</span> DQLN,<a class="code" href="group__integers.html#ga6">uint</a> Y,<span class="keywordtype">int</span>& DQL)<a name="l00201"></a>00201 {<a name="l00202"></a>00202 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQLN,12);<a name="l00203"></a>00203 <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(Y,13);<a name="l00204"></a>00204 DQL = DQLN+(Y>>2);<a name="l00205"></a>00205 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQL,12);<a name="l00206"></a>00206 }<a name="l00207"></a>00207 <a name="l00208"></a>00208 <a name="l00212"></a><a class="code" href="group__g726__section4.html#ga5">00212</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga5">ANTILOG</a>(<span class="keywordtype">int</span> DQL,<span class="keywordtype">int</span> DQS,<a class="code" href="group__integers.html#ga6">uint</a>& DQ)<a name="l00213"></a>00213 {<a name="l00214"></a>00214 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQL,12);⌨️ 快捷键说明
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