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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 1.4.1 --><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">00001 00025 <span class="preprocessor">#include "<a class="code" href="common_8h.html">common.h</a>"</span>00026 <span class="preprocessor">#include "<a class="code" href="G726_8h.html">G726.h</a>"</span>00027 <span class="preprocessor">#include "<a class="code" href="G711_8h.html">G711.h</a>"</span>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>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>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>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>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>00078 <span class="preprocessor"></span> <span class="comment">// End of group</span>00080 00081 <a name="l00085"></a><a class="code" href="group__g726__section4.html#ga0">00085</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga0">EXPAND</a>(uint S,uint LAW,<span class="keywordtype">int</span>& SL)00086 {00087 <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(S,8);00088 <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(LAW,1);00089 <span class="keywordtype">int</span> linear;00090 <span class="keywordflow">if</span>(LAW)00091 linear = <a class="code" href="classG711.html#e1">G711::ALawDecode</a>(S);00092 <span class="keywordflow">else</span>00093 linear = <a class="code" href="classG711.html#e3">G711::ULawDecode</a>(S);00094 SL = linear>>2;00095 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(SL,14);00096 }00097 00098 <a name="l00102"></a><a class="code" href="group__g726__section4.html#ga1">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#ga1">SUBTA</a>(<span class="keywordtype">int</span> SL,<span class="keywordtype">int</span> SE,<span class="keywordtype">int</span>& D)00103 {00104 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(SL,14);00105 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(SE,15);00106 D = SL-SE;00107 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(D,16);00108 }00109 00110 <a name="l00114"></a><a class="code" href="group__g726__section4.html#ga2">00114</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga2">LOG</a>(<span class="keywordtype">int</span> D,uint& DL,<span class="keywordtype">int</span>& DS)00115 {00116 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(D,16);00117 00118 DS = D>>15;00119 00120 <a class="code" href="group__integers.html#ga6">uint</a> DQM = (D<0) ? -D : D;00121 DQM &= 0x7fff;00122 00123 <a class="code" href="group__integers.html#ga6">uint</a> EXP = 0;00124 <a class="code" href="group__integers.html#ga6">uint</a> x = DQM;00125 <span class="keywordflow">if</span>(x>=(1<<8))00126 {00127 EXP |= 8;00128 x >>= 8;00129 }00130 <span class="keywordflow">if</span>(x>=(1<<4))00131 {00132 EXP |= 4;00133 x >>= 4;00134 }00135 <span class="keywordflow">if</span>(x>=(1<<2))00136 {00137 EXP |= 2;00138 x >>= 2;00139 }00140 EXP |= x>>1;00141 00142 <a class="code" href="group__integers.html#ga6">uint</a> MANT = ((DQM<<7)>>EXP)&0x7f;00143 DL = (EXP<<7) + MANT;00144 00145 <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(DL,11);00146 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DS,1);00147 }00148 00149 <a name="l00153"></a><a class="code" href="group__g726__section4.html#ga3">00153</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga3">QUAN</a>(uint RATE,<span class="keywordtype">int</span> DLN,<span class="keywordtype">int</span> DS,uint& I)00154 {00155 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DLN,12);00156 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DS,1);00157 00158 <span class="keywordtype">int</span> x;00159 00160 <span class="keywordflow">if</span>(RATE==2)00161 x = (DLN>=261);00162 <span class="keywordflow">else</span>00163 {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};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};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};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};00168 00169 <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a>* levels = quan[RATE-3];00170 <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a>* levels0 = levels;00171 00172 <span class="keywordflow">while</span>(DLN>=*levels++) {}00173 00174 x = levels-levels0-1;00175 <span class="keywordflow">if</span>(!x)00176 x = ~DS;00177 }00178 <span class="keywordtype">int</span> mask = (1<<RATE)-1;00179 I = (x^DS)&mask;00180 00181 <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(I,RATE);00182 }00183 00184 <a name="l00188"></a><a class="code" href="group__g726__section4.html#ga4">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#ga4">SUBTB</a>(uint DL,uint Y,<span class="keywordtype">int</span>& DLN)00189 {00190 <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(DL,11);00191 <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(Y,13);00192 DLN = DL-(Y>>2);00193 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DLN,12);00194 }00195 00196 <a name="l00200"></a><a class="code" href="group__g726__section4.html#ga5">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#ga5">ADDA</a>(<span class="keywordtype">int</span> DQLN,uint Y,<span class="keywordtype">int</span>& DQL)00201 {00202 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQLN,12);00203 <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(Y,13);00204 DQL = DQLN+(Y>>2);00205 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQL,12);00206 }00207 00208 <a name="l00212"></a><a class="code" href="group__g726__section4.html#ga6">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#ga6">ANTILOG</a>(<span class="keywordtype">int</span> DQL,<span class="keywordtype">int</span> DQS,uint& DQ)00213 {00214 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQL,12);00215 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQS,1);00216 <a class="code" href="group__integers.html#ga6">uint</a> DEX = (DQL >> 7) & 15;00217 <a class="code" href="group__integers.html#ga6">uint</a> DMN = DQL & 127;00218 <a class="code" href="group__integers.html#ga6">uint</a> DQT = (1 << 7) + DMN;00219 00220 <a class="code" href="group__integers.html#ga6">uint</a> DQMAG;00221 <span class="keywordflow">if</span>(DQL>=0)00222 DQMAG = (DQT << 7) >> (14 - DEX);00223 <span class="keywordflow">else</span>00224 DQMAG = 0;00225 00226 DQ = DQS ? DQMAG+(1<<15) : DQMAG;00227 00228 <a class="code" href="group__g726__section4m.html#ga0">CHECK_SM</a>(DQ,16);00229 }00230 00231 <a name="l00235"></a><a class="code" href="group__g726__section4.html#ga7">00235</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga7">RECONST</a>(uint RATE,uint I,<span class="keywordtype">int</span>& DQLN,<span class="keywordtype">int</span>& DQS)00236 {00237 <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(I,RATE);00238 00239 <span class="comment">// Tables 11-14</span>00240 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> reconst2[2] = {116,365};00241 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> reconst3[4] = {2048-4096,135,273,373};00242 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> reconst4[8] = {2048-4096,4,135,213,273,323,373,425};00243 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> reconst5[16] = {2048-4096,4030-4096,28,104,169,224,274,318,358,395,429,459,488,514,539,566};00244 <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> reconst[4] = {reconst2,reconst3,reconst4,reconst5};00245 00246 <span class="keywordtype">int</span> x = I;00247 <span class="keywordtype">int</span> m = 1<<(RATE-1);00248 <span class="keywordflow">if</span>(x&m)00249 {00250 DQS = -1;00251 x = ~x;00252 }00253 <span class="keywordflow">else</span>00254 DQS = 0;00255 DQLN = reconst[RATE-2][x&(m-1)];00256 00257 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQLN,12);00258 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQS,1);00259 }00260 00261 <a name="l00265"></a><a class="code" href="group__g726__section4.html#ga8">00265</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga8">FILTD</a>(<span class="keywordtype">int</span> WI,uint Y,uint& YUT)00266 {00267 <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(WI,12);00268 <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(Y,13);00269 <span class="keywordtype">int</span> DIF = (WI<<5)-Y;00270 <span class="keywordtype">int</span> DIFSX = DIF>>5;⌨️ 快捷键说明
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