g726_8cpp-source.html

来自「Tixys source code, include G.711, G.726,」· HTML 代码 · 共 937 行 · 第 1/5 页

00716     <a class="code" href="group__g726__section4m.html#ga0">CHECK_SM</a>(DQ,16);
00717     <span class="keywordtype">int</span> UGBn;
00718     <span class="keywordflow">if</span>(DQ&amp;32767)
00719         UGBn = Un ? -128 : 128;
00720     <span class="keywordflow">else</span>
00721         UGBn = 0;
00722     <span class="keywordtype">int</span> ULBn = (RATE==5) ? Bn&gt;&gt;9 : Bn&gt;&gt;8;
00723     BnP = (<a class="code" href="group__integers.html#ga4">int16</a>)(Bn+UGBn-ULBn);
00724     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(BnP,16);
00725     }
00726 
00727 
<a name="l00731"></a><a class="code" href="group__g726__section4.html#ga33">00731</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga33">XOR</a>(uint DQn,uint DQ,<span class="keywordtype">int</span>&amp; Un)
00732     {
00733     <a class="code" href="group__g726__section4m.html#ga3">CHECK_FL</a>(DQn,11);
00734     <a class="code" href="group__g726__section4m.html#ga0">CHECK_SM</a>(DQ,16);
00735     Un = -(int)((DQn&gt;&gt;10)^(DQ&gt;&gt;15));
00736     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(Un,1);
00737     }
00738 
00739 
<a name="l00743"></a><a class="code" href="group__g726__section4.html#ga34">00743</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga34">TONE</a>(<span class="keywordtype">int</span> A2P,uint&amp; TDP)
00744     {
00745     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(A2P,16);
00746     TDP = A2P&lt;(53760-65536);
00747     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(TDP,1);
00748     }
00749 
00750 
<a name="l00754"></a><a class="code" href="group__g726__section4.html#ga35">00754</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga35">TRANS</a>(uint TD,uint YL,uint DQ,uint&amp; TR)
00755     {
00756     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(TD,1);
00757     <a class="code" href="group__g726__section4m.html#ga1">CHECK_UM</a>(YL,19);
00758     <a class="code" href="group__g726__section4m.html#ga0">CHECK_SM</a>(DQ,16);
00759     <a class="code" href="group__integers.html#ga6">uint</a> DQMAG = DQ&amp;32767;
00760     <a class="code" href="group__integers.html#ga6">uint</a> YLINT = YL&gt;&gt;15;
00761     <a class="code" href="group__integers.html#ga6">uint</a> YLFRAC = (YL&gt;&gt;10) &amp; 31;
00762     <a class="code" href="group__integers.html#ga6">uint</a> THR1 = (32+YLFRAC)&lt;&lt;YLINT;
00763     <a class="code" href="group__integers.html#ga6">uint</a> THR2;
00764     <span class="keywordflow">if</span>(YLINT&gt;9)
00765         THR2 = 31&lt;&lt;10;
00766     <span class="keywordflow">else</span>
00767         THR2 = THR1;
00768     <a class="code" href="group__integers.html#ga6">uint</a> DQTHR = (THR2+(THR2&gt;&gt;1)) &gt;&gt; 1;
00769     TR = DQMAG&gt;DQTHR &amp;&amp; TD;
00770     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(TR,1);
00771     }
00772 
00773 
<a name="l00777"></a><a class="code" href="group__g726__section4.html#ga36">00777</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga36">COMPRESS</a>(<span class="keywordtype">int</span> SR,uint LAW,uint&amp; SP)
00778     {
00779     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(SR,16);
00780     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(LAW,1);
00781     <span class="keywordtype">int</span> x = SR;
00782 
00783 <span class="preprocessor">#ifdef IMPLEMENT_G191_BUGS</span>
00784 <span class="preprocessor"></span>    <span class="comment">// reproduce bugs in G191 reference implementation...</span>
00785     <span class="keywordflow">if</span>(x==-0x8000)
00786         x=-1; 
00787     <span class="keywordflow">else</span>
00788         <span class="keywordflow">if</span>(!LAW &amp;&amp; x&lt;0) x--;
00789 <span class="preprocessor">#endif</span>
00790 <span class="preprocessor"></span>
00791     <span class="comment">// Clamp to 14 bits...</span>
00792     <span class="keywordflow">if</span>(x&gt;=(1&lt;&lt;13))
00793         x = (1&lt;&lt;13)-1;
00794     <span class="keywordflow">else</span> <span class="keywordflow">if</span>(x&lt;-(1&lt;&lt;13))
00795         x = -(1&lt;&lt;13);
00796 
00797     <span class="keywordflow">if</span>(LAW)
00798         SP = <a class="code" href="classG711.html#e0">G711::ALawEncode</a>(x&lt;&lt;2);
00799     <span class="keywordflow">else</span>
00800         SP = <a class="code" href="classG711.html#e2">G711::ULawEncode</a>(x&lt;&lt;2);
00801 
00802     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(SP,8);
00803     }
00804 
00805 
<a name="l00809"></a><a class="code" href="group__g726__section4.html#ga37">00809</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga37">SYNC</a>(uint RATE,uint I,uint SP,<span class="keywordtype">int</span> DLNX,<span class="keywordtype">int</span> DSX,uint LAW,uint&amp; SD)
00810     {
00811     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(SP,8);
00812     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DLNX,12);
00813     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(DSX,1);
00814     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(LAW,1);
00815 
00816     <a class="code" href="group__integers.html#ga6">uint</a> ID;
00817     <a class="code" href="group__integers.html#ga6">uint</a> IM;
00818     <a class="code" href="group__g726__section4.html#ga3">QUAN</a>(RATE,DLNX,DSX,ID);
00819     <a class="code" href="group__integers.html#ga6">uint</a> signMask = 1&lt;&lt;(RATE-1);
00820     ID = ID^signMask;
00821     IM = I^signMask;
00822 
00823     <a class="code" href="group__integers.html#ga6">uint</a> s;
00824     <span class="keywordflow">if</span>(LAW)
00825         {
00826         s = SP^0x55;
00827         <span class="keywordflow">if</span>(!(s&amp;0x80))
00828             s = s^0x7f;
00829         }
00830     <span class="keywordflow">else</span>
00831         {
00832         s = SP;
00833         <span class="keywordflow">if</span>(s&amp;0x80)
00834             s = s^0x7f;
00835         }
00836     <span class="comment">// s = ALAW/uLAW code converted to range 0x00..0xff</span>
00837     <span class="comment">// where 0x00 is most-negative and 0xff is most-positive</span>
00838 
00839     <span class="keywordflow">if</span>(ID&lt;IM)
00840         {
00841         <span class="keywordflow">if</span>(s&lt;0xff)
00842             ++s;
00843         }
00844     <span class="keywordflow">else</span> <span class="keywordflow">if</span>(ID&gt;IM)
00845         {
00846         <span class="keywordflow">if</span>(s&gt;0x00)
00847             {
00848             --s;
00849             <span class="keywordflow">if</span>(s==0x7f &amp;&amp; !LAW) --s; <span class="comment">// TABLE 20/G.726 says uLaw 0xFF decrements to 0x7e and not 0x7f (!?)</span>
00850             }
00851         }
00852 
00853     <span class="comment">// convert s back to ALAW/uLAW code</span>
00854     <span class="keywordflow">if</span>(LAW)
00855         {
00856         <span class="keywordflow">if</span>(!(s&amp;0x80))
00857             s = s^0x7f;
00858         s = s^0x55;
00859         }
00860     <span class="keywordflow">else</span>
00861         {
00862         <span class="keywordflow">if</span>(s&amp;0x80)
00863             s = s^0x7f;
00864         }
00865     SD = s;
00866     <a class="code" href="group__g726__section4m.html#ga4">CHECK_UNSIGNED</a>(SD,8);
00867     }
00868 
00869 
<a name="l00873"></a><a class="code" href="group__g726__section4.html#ga38">00873</a> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4.html#ga38">LIMO</a>(<span class="keywordtype">int</span> SR,<span class="keywordtype">int</span>&amp; SO)
00874     {
00875     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(SR,16);
00876     <span class="keywordflow">if</span>(SR&gt;=(1&lt;&lt;13))
00877         SO = (1&lt;&lt;13)-1;
00878     <span class="keywordflow">else</span> <span class="keywordflow">if</span>(SR&lt;-(1&lt;&lt;13))
00879         SO = -(1&lt;&lt;13);
00880     <span class="keywordflow">else</span>
00881         SO = SR;
00882     <a class="code" href="group__g726__section4m.html#ga2">CHECK_TC</a>(SO,14);
00883     }
00884 
00885  <span class="comment">// End of group</span>
00887 
00888 
<a name="l00901"></a><a class="code" href="group__g726__section4B.html#ga0">00901</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4B.html#ga0">G726::InputPCMFormatConversionAndDifferenceSignalComputation</a>(uint S,<span class="keywordtype">int</span> SE,<span class="keywordtype">int</span>&amp; D)
00902     {
00903     <span class="keywordtype">int</span> SL;
00904     <a class="code" href="group__g726__section4.html#ga0">EXPAND</a>(S,LAW,SL);
00905     <a class="code" href="group__g726__section4.html#ga1">SUBTA</a>(SL,SE,D);
00906     }
00907 
00908 
<a name="l00912"></a><a class="code" href="group__g726__section4B.html#ga1">00912</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4B.html#ga1">G726::AdaptiveQuantizer</a>(<span class="keywordtype">int</span> D,uint Y,uint&amp; I)
00913     {
00914     <a class="code" href="group__integers.html#ga6">uint</a> DL;
00915     <span class="keywordtype">int</span> DS;
00916     <a class="code" href="group__g726__section4.html#ga2">LOG</a>(D,DL,DS);
00917 
00918     <span class="keywordtype">int</span> DLN;
00919     <a class="code" href="group__g726__section4.html#ga4">SUBTB</a>(DL,Y,DLN);
00920 
00921     <a class="code" href="group__g726__section4.html#ga3">QUAN</a>(RATE,DLN,DS,I);
00922     }
00923 
00924 
<a name="l00928"></a><a class="code" href="group__g726__section4B.html#ga2">00928</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="group__g726__section4B.html#ga2">G726::InverseAdaptiveQuantizer</a>(uint I,uint Y,uint&amp; DQ)
00929     {
00930     <span class="keywordtype">int</span> DQLN;
00931     <span class="keywordtype">int</span> DQS;
00932     <a class="code" href="group__g726__section4.html#ga7">RECONST</a>(RATE,I,DQLN,DQS);
00933 
00934     <span class="keywordtype">int</span> DQL;
00935     <a class="code" href="group__g726__section4.html#ga5">ADDA</a>(DQLN,Y,DQL);
00936 
00937     <a class="code" href="group__g726__section4.html#ga6">ANTILOG</a>(DQL,DQS,DQ);
00938     }
00939 
00940