g726_8cpp-source.html

这个是关于G.726算法的源程序

<a name="l00215"></a>00215     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQS,1);
<a name="l00216"></a>00216     <a class="code" href="group__integers.html#ga6">uint</a> DEX = (DQL &gt;&gt; 7) &amp; 15;
<a name="l00217"></a>00217     <a class="code" href="group__integers.html#ga6">uint</a> DMN = DQL &amp; 127;
<a name="l00218"></a>00218     <a class="code" href="group__integers.html#ga6">uint</a> DQT = (1 &lt;&lt; 7) + DMN;
<a name="l00219"></a>00219 
<a name="l00220"></a>00220     <a class="code" href="group__integers.html#ga6">uint</a> DQMAG;
<a name="l00221"></a>00221     <span class="keywordflow">if</span>(DQL&gt;=0)
<a name="l00222"></a>00222         DQMAG = (DQT &lt;&lt; 7) &gt;&gt; (14 - DEX);
<a name="l00223"></a>00223     <span class="keywordflow">else</span>
<a name="l00224"></a>00224         DQMAG = 0;
<a name="l00225"></a>00225 
<a name="l00226"></a>00226     DQ = DQS ? DQMAG+(1&lt;&lt;15) : DQMAG;
<a name="l00227"></a>00227 
<a name="l00228"></a>00228     <a class="code" href="group__g726__section4m.html#ga0">CHECK_SM</a>(DQ,16);
<a name="l00229"></a>00229     }
<a name="l00230"></a>00230 
<a name="l00231"></a>00231 
<a name="l00235"></a><a class="code" href="group__g726__section4.html#ga6">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#ga6">RECONST</a>(<a class="code" href="group__integers.html#ga6">uint</a> RATE,<a class="code" href="group__integers.html#ga6">uint</a> I,<span class="keywordtype">int</span>&amp; DQLN,<span class="keywordtype">int</span>&amp; DQS)
<a name="l00236"></a>00236     {
<a name="l00237"></a>00237     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(I,RATE);
<a name="l00238"></a>00238 
<a name="l00239"></a>00239     <span class="comment">// Tables 11-14</span>
<a name="l00240"></a>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};
<a name="l00241"></a>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};
<a name="l00242"></a>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};
<a name="l00243"></a>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};
<a name="l00244"></a>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};
<a name="l00245"></a>00245 
<a name="l00246"></a>00246     <span class="keywordtype">int</span> x = I;
<a name="l00247"></a>00247     <span class="keywordtype">int</span> m = 1&lt;&lt;(RATE-1);
<a name="l00248"></a>00248     <span class="keywordflow">if</span>(x&amp;m)
<a name="l00249"></a>00249         {
<a name="l00250"></a>00250         DQS = -1;
<a name="l00251"></a>00251         x = ~x;
<a name="l00252"></a>00252         }
<a name="l00253"></a>00253     <span class="keywordflow">else</span>
<a name="l00254"></a>00254         DQS = 0;
<a name="l00255"></a>00255     DQLN = reconst[RATE-2][x&amp;(m-1)];
<a name="l00256"></a>00256 
<a name="l00257"></a>00257     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQLN,12);
<a name="l00258"></a>00258     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DQS,1);
<a name="l00259"></a>00259     }
<a name="l00260"></a>00260 
<a name="l00261"></a>00261 
<a name="l00265"></a><a class="code" href="group__g726__section4.html#ga7">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#ga7">FILTD</a>(<span class="keywordtype">int</span> WI,<a class="code" href="group__integers.html#ga6">uint</a> Y,<a class="code" href="group__integers.html#ga6">uint</a>&amp; YUT)
<a name="l00266"></a>00266     {
<a name="l00267"></a>00267     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(WI,12);
<a name="l00268"></a>00268     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(Y,13);
<a name="l00269"></a>00269     <span class="keywordtype">int</span> DIF = (WI&lt;&lt;5)-Y;
<a name="l00270"></a>00270     <span class="keywordtype">int</span> DIFSX = DIF&gt;&gt;5;
<a name="l00271"></a>00271     YUT = (Y+DIFSX); <span class="comment">// &amp; 8191</span>
<a name="l00272"></a>00272     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(YUT,13);
<a name="l00273"></a>00273     }
<a name="l00274"></a>00274 
<a name="l00275"></a>00275 
<a name="l00279"></a><a class="code" href="group__g726__section4.html#ga8">00279</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">FILTE</a>(<a class="code" href="group__integers.html#ga6">uint</a> YUP,<a class="code" href="group__integers.html#ga6">uint</a> YL,<a class="code" href="group__integers.html#ga6">uint</a>&amp; YLP)
<a name="l00280"></a>00280     {
<a name="l00281"></a>00281     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(YUP,13);
<a name="l00282"></a>00282     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(YL,19);
<a name="l00283"></a>00283     <span class="keywordtype">int</span> DIF = (YUP&lt;&lt;6)-YL;
<a name="l00284"></a>00284     <span class="keywordtype">int</span> DIFSX = DIF&gt;&gt;6;
<a name="l00285"></a>00285     YLP = (YL+DIFSX); <span class="comment">// &amp; 524287</span>
<a name="l00286"></a>00286     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(YLP,19);
<a name="l00287"></a>00287     }
<a name="l00288"></a>00288 
<a name="l00289"></a>00289 
<a name="l00293"></a><a class="code" href="group__g726__section4.html#ga9">00293</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga9">FUNCTW</a>(<a class="code" href="group__integers.html#ga6">uint</a> RATE,<a class="code" href="group__integers.html#ga6">uint</a> I,<span class="keywordtype">int</span>&amp; WI)
<a name="l00294"></a>00294     {
<a name="l00295"></a>00295     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(I,RATE);
<a name="l00296"></a>00296 
<a name="l00297"></a>00297     <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> functw2[2] = {4074-4096,439};
<a name="l00298"></a>00298     <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> functw3[4] = {4092-4096,30,137,582};
<a name="l00299"></a>00299     <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> functw4[8] = {4084-4096,18,41,64,112,198,355,1122};
<a name="l00300"></a>00300     <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="group__integers.html#ga4">int16</a> functw5[16] = {14,14,24,39,40,41,58,100,141,179,219,280,358,440,529,696};
<a name="l00301"></a>00301     <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> functw[4] = {functw2,functw3,functw4,functw5};
<a name="l00302"></a>00302 
<a name="l00303"></a>00303     <a class="code" href="group__integers.html#ga6">uint</a> signMask = 1&lt;&lt;(RATE-1);
<a name="l00304"></a>00304     <a class="code" href="group__integers.html#ga6">uint</a> n = (I&amp;signMask) ? (2*signMask-1)-I : I;
<a name="l00305"></a>00305     WI = functw[RATE-2][n];
<a name="l00306"></a>00306 
<a name="l00307"></a>00307     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(WI,12);
<a name="l00308"></a>00308     }
<a name="l00309"></a>00309 
<a name="l00310"></a>00310 
<a name="l00314"></a><a class="code" href="group__g726__section4.html#ga10">00314</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga10">LIMB</a>(<a class="code" href="group__integers.html#ga6">uint</a> YUT,<a class="code" href="group__integers.html#ga6">uint</a>&amp; YUP)
<a name="l00315"></a>00315     {
<a name="l00316"></a>00316     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(YUT,13);
<a name="l00317"></a>00317     <a class="code" href="group__integers.html#ga6">uint</a> GEUL = (YUT+11264)&amp;(1&lt;&lt;13);
<a name="l00318"></a>00318     <a class="code" href="group__integers.html#ga6">uint</a> GELL = (YUT+15840)&amp;(1&lt;&lt;13);
<a name="l00319"></a>00319     <span class="keywordflow">if</span>(GELL)
<a name="l00320"></a>00320         YUP = 544;
<a name="l00321"></a>00321     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!GEUL)
<a name="l00322"></a>00322         YUP = 5120;
<a name="l00323"></a>00323     <span class="keywordflow">else</span>
<a name="l00324"></a>00324         YUP = YUT;
<a name="l00325"></a>00325     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(YUP,13);
<a name="l00326"></a>00326     }
<a name="l00327"></a>00327 
<a name="l00328"></a>00328 
<a name="l00332"></a><a class="code" href="group__g726__section4.html#ga11">00332</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga11">MIX</a>(<a class="code" href="group__integers.html#ga6">uint</a> AL,<a class="code" href="group__integers.html#ga6">uint</a> YU,<a class="code" href="group__integers.html#ga6">uint</a> YL,<a class="code" href="group__integers.html#ga6">uint</a>&amp; Y)
<a name="l00333"></a>00333     {
<a name="l00334"></a>00334     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(AL,7);
<a name="l00335"></a>00335     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(YU,13);
<a name="l00336"></a>00336     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(YL,19);
<a name="l00337"></a>00337     <span class="keywordtype">int</span> DIF = YU-(YL&gt;&gt;6);
<a name="l00338"></a>00338     <span class="keywordtype">int</span> PROD = DIF*AL;
<a name="l00339"></a>00339     <span class="keywordflow">if</span>(DIF&lt;0) PROD += (1&lt;&lt;6)-1; <span class="comment">// Force round towards zero for following shift</span>
<a name="l00340"></a>00340     PROD &gt;&gt;= 6;
<a name="l00341"></a>00341     Y = ((YL&gt;&gt;6)+PROD); <span class="comment">// &amp; 8191;</span>
<a name="l00342"></a>00342     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(Y,13);
<a name="l00343"></a>00343     }
<a name="l00344"></a>00344 
<a name="l00345"></a>00345 
<a name="l00349"></a><a class="code" href="group__g726__section4.html#ga12">00349</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga12">FILTA</a>(<a class="code" href="group__integers.html#ga6">uint</a> FI,<a class="code" href="group__integers.html#ga6">uint</a> DMS,<a class="code" href="group__integers.html#ga6">uint</a>&amp; DMSP)
<a name="l00350"></a>00350     {
<a name="l00351"></a>00351     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(FI,3);
<a name="l00352"></a>00352     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(DMS,12);
<a name="l00353"></a>00353     <span class="keywordtype">int</span> DIF = (FI&lt;&lt;9)-DMS;
<a name="l00354"></a>00354     <span class="keywordtype">int</span> DIFSX = (DIF&gt;&gt;5);
<a name="l00355"></a>00355     DMSP = (DIFSX+DMS); <span class="comment">// &amp; 4095;</span>
<a name="l00356"></a>00356     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(DMSP,12);
<a name="l00357"></a>00357     }
<a name="l00358"></a>00358 
<a name="l00359"></a>00359 
<a name="l00363"></a><a class="code" href="group__g726__section4.html#ga13">00363</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga13">FILTB</a>(<a class="code" href="group__integers.html#ga6">uint</a> FI,<a class="code" href="group__integers.html#ga6">uint</a> DML,<a class="code" href="group__integers.html#ga6">uint</a>&amp; DMLP)
<a name="l00364"></a>00364     {
<a name="l00365"></a>00365     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(FI,3);
<a name="l00366"></a>00366     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(DML,14);
<a name="l00367"></a>00367     <span class="keywordtype">int</span> DIF = (FI&lt;&lt;11)-DML;
<a name="l00368"></a>00368     <span class="keywordtype">int</span> DIFSX = (DIF&gt;&gt;7);
<a name="l00369"></a>00369     DMLP = (DIFSX+DML); <span class="comment">// &amp; 16383;</span>
<a name="l00370"></a>00370     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(DMLP,14);
<a name="l00371"></a>00371     }
<a name="l00372"></a>00372 
<a name="l00373"></a>00373 
<a name="l00377"></a><a class="code" href="group__g726__section4.html#ga14">00377</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga14">FILTC</a>(<a class="code" href="group__integers.html#ga6">uint</a> AX,<a class="code" href="group__integers.html#ga6">uint</a> AP,<a class="code" href="group__integers.html#ga6">uint</a>&amp; APP)
<a name="l00378"></a>00378     {
<a name="l00379"></a>00379     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(AX,1);