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<h1>synth_filter.c</h1><a href="synth__filter_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright (c) 2005, The Musepack Development Team</span>
<a name="l00003"></a>00003 <span class="comment"> All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> Redistribution and use in source and binary forms, with or without</span>
<a name="l00006"></a>00006 <span class="comment"> modification, are permitted provided that the following conditions are</span>
<a name="l00007"></a>00007 <span class="comment"> met:</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment"> * Redistributions of source code must retain the above copyright</span>
<a name="l00010"></a>00010 <span class="comment"> notice, this list of conditions and the following disclaimer.</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment"> * Redistributions in binary form must reproduce the above</span>
<a name="l00013"></a>00013 <span class="comment"> copyright notice, this list of conditions and the following</span>
<a name="l00014"></a>00014 <span class="comment"> disclaimer in the documentation and/or other materials provided</span>
<a name="l00015"></a>00015 <span class="comment"> with the distribution.</span>
<a name="l00016"></a>00016 <span class="comment"></span>
<a name="l00017"></a>00017 <span class="comment"> * Neither the name of the The Musepack Development Team nor the</span>
<a name="l00018"></a>00018 <span class="comment"> names of its contributors may be used to endorse or promote</span>
<a name="l00019"></a>00019 <span class="comment"> products derived from this software without specific prior</span>
<a name="l00020"></a>00020 <span class="comment"> written permission.</span>
<a name="l00021"></a>00021 <span class="comment"></span>
<a name="l00022"></a>00022 <span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00023"></a>00023 <span class="comment"> "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00024"></a>00024 <span class="comment"> LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00025"></a>00025 <span class="comment"> A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00026"></a>00026 <span class="comment"> OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00027"></a>00027 <span class="comment"> SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00028"></a>00028 <span class="comment"> LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<a name="l00029"></a>00029 <span class="comment"> DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<a name="l00030"></a>00030 <span class="comment"> THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00031"></a>00031 <span class="comment"> (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00032"></a>00032 <span class="comment"> OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00033"></a>00033 <span class="comment">*/</span>
<a name="l00034"></a>00034
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="preprocessor">#include <<a class="code" href="mpcdec_8h.html">mpcdec/mpcdec.h</a>></span>
<a name="l00040"></a>00040 <span class="preprocessor">#include <<a class="code" href="internal_8h.html">mpcdec/internal.h</a>></span>
<a name="l00041"></a>00041
<a name="l00042"></a><a class="code" href="synth__filter_8c.html#a2">00042</a> <span class="keyword">typedef</span> mpc_int32_t <a class="code" href="synth__filter_8c.html#a2">ptrdiff_t</a>;
<a name="l00043"></a>00043
<a name="l00044"></a>00044 <span class="comment">/* C O N S T A N T S */</span>
<a name="l00045"></a>00045 <span class="preprocessor">#undef _</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span>
<a name="l00047"></a><a class="code" href="synth__filter_8c.html#a0">00047</a> <span class="preprocessor">#define MPC_FIXED_POINT_SYNTH_FIX 2</span>
<a name="l00048"></a>00048 <span class="preprocessor"></span>
<a name="l00049"></a>00049 <span class="preprocessor">#ifdef MPC_FIXED_POINT</span>
<a name="l00050"></a>00050 <span class="preprocessor"></span><span class="preprocessor">#define _(value) MPC_MAKE_FRACT_CONST((double)value/(double)(0x40000))</span>
<a name="l00051"></a>00051 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00052"></a><a class="code" href="synth__filter_8c.html#a1">00052</a> <span class="preprocessor"></span><span class="preprocessor">#define _(value) MAKE_MPC_SAMPLE((double)value/(double)(0x10000))</span>
<a name="l00053"></a>00053 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00054"></a>00054 <span class="preprocessor"></span>
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> Di_opt [32] [16] = {
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<a name="l00089"></a>00089 };
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="preprocessor">#undef _</span>
<a name="l00092"></a>00092 <span class="preprocessor"></span>
<a name="l00093"></a>00093 <span class="keyword">static</span> <span class="keywordtype">void</span> Calculate_New_V ( <span class="keyword">const</span> <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> * Sample, <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> * V )
<a name="l00094"></a>00094 {
<a name="l00095"></a>00095 <span class="comment">// Calculating new V-buffer values for left channel</span>
<a name="l00096"></a>00096 <span class="comment">// calculate new V-values (ISO-11172-3, p. 39)</span>
<a name="l00097"></a>00097 <span class="comment">// based upon fast-MDCT algorithm by Byeong Gi Lee</span>
<a name="l00098"></a>00098 <span class="comment">/*static*/</span> <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> A00, A01, A02, A03, A04, A05, A06, A07, A08, A09, A10, A11, A12, A13, A14, A15;
<a name="l00099"></a>00099 <span class="comment">/*static*/</span> <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> B00, B01, B02, B03, B04, B05, B06, B07, B08, B09, B10, B11, B12, B13, B14, B15;
<a name="l00100"></a>00100 <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> tmp;
<a name="l00101"></a>00101
<a name="l00102"></a>00102 A00 = Sample[ 0] + Sample[31];
<a name="l00103"></a>00103 A01 = Sample[ 1] + Sample[30];
<a name="l00104"></a>00104 A02 = Sample[ 2] + Sample[29];
<a name="l00105"></a>00105 A03 = Sample[ 3] + Sample[28];
<a name="l00106"></a>00106 A04 = Sample[ 4] + Sample[27];
<a name="l00107"></a>00107 A05 = Sample[ 5] + Sample[26];
<a name="l00108"></a>00108 A06 = Sample[ 6] + Sample[25];
<a name="l00109"></a>00109 A07 = Sample[ 7] + Sample[24];
<a name="l00110"></a>00110 A08 = Sample[ 8] + Sample[23];
<a name="l00111"></a>00111 A09 = Sample[ 9] + Sample[22];
<a name="l00112"></a>00112 A10 = Sample[10] + Sample[21];
<a name="l00113"></a>00113 A11 = Sample[11] + Sample[20];
<a name="l00114"></a>00114 A12 = Sample[12] + Sample[19];
<a name="l00115"></a>00115 A13 = Sample[13] + Sample[18];
<a name="l00116"></a>00116 A14 = Sample[14] + Sample[17];
<a name="l00117"></a>00117 A15 = Sample[15] + Sample[16];
<a name="l00118"></a>00118
<a name="l00119"></a>00119 B00 = A00 + A15;
<a name="l00120"></a>00120 B01 = A01 + A14;
<a name="l00121"></a>00121 B02 = A02 + A13;
<a name="l00122"></a>00122 B03 = A03 + A12;
<a name="l00123"></a>00123 B04 = A04 + A11;
<a name="l00124"></a>00124 B05 = A05 + A10;
<a name="l00125"></a>00125 B06 = A06 + A09;
<a name="l00126"></a>00126 B07 = A07 + A08;;
<a name="l00127"></a>00127 B08 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A00 - A15) , 0.5024192929f , 31);
<a name="l00128"></a>00128 B09 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A01 - A14) , 0.5224986076f , 31);
<a name="l00129"></a>00129 B10 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A02 - A13) , 0.5669440627f , 31);
<a name="l00130"></a>00130 B11 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A03 - A12) , 0.6468217969f , 31);
<a name="l00131"></a>00131 B12 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A04 - A11) , 0.7881546021f , 31);
<a name="l00132"></a>00132 B13 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A05 - A10) , 1.0606776476f , 30);
<a name="l00133"></a>00133 B14 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A06 - A09) , 1.7224471569f , 30);
<a name="l00134"></a>00134 B15 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A07 - A08) , 5.1011486053f , 28);
<a name="l00135"></a>00135
<a name="l00136"></a>00136 A00 = B00 + B07;
<a name="l00137"></a>00137 A01 = B01 + B06;
<a name="l00138"></a>00138 A02 = B02 + B05;
<a name="l00139"></a>00139 A03 = B03 + B04;
<a name="l00140"></a>00140 A04 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B00 - B07) , 0.5097956061f , 31);
<a name="l00141"></a>00141 A05 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B01 - B06) , 0.6013448834f , 31);
<a name="l00142"></a>00142 A06 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B02 - B05) , 0.8999761939f , 31);
<a name="l00143"></a>00143 A07 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B03 - B04) , 2.5629155636f , 29);
<a name="l00144"></a>00144 A08 = B08 + B15;
<a name="l00145"></a>00145 A09 = B09 + B14;
<a name="l00146"></a>00146 A10 = B10 + B13;
<a name="l00147"></a>00147 A11 = B11 + B12;
<a name="l00148"></a>00148 A12 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B08 - B15) , 0.5097956061f , 31);
<a name="l00149"></a>00149 A13 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B09 - B14) , 0.6013448834f , 31);
<a name="l00150"></a>00150 A14 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B10 - B13) , 0.8999761939f , 31);
<a name="l00151"></a>00151 A15 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B11 - B12) , 2.5629155636f , 29);
<a name="l00152"></a>00152
<a name="l00153"></a>00153 B00 = A00 + A03;
<a name="l00154"></a>00154 B01 = A01 + A02;
<a name="l00155"></a>00155 B02 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((A00 - A03) , 0.5411961079f , 1);
<a name="l00156"></a>00156 B03 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((A01 - A02) , 1.3065630198f , 2);
<a name="l00157"></a>00157 B04 = A04 + A07;
<a name="l00158"></a>00158 B05 = A05 + A06;
<a name="l00159"></a>00159 B06 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((A04 - A07) , 0.5411961079f , 1);
<a name="l00160"></a>00160 B07 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((A05 - A06) , 1.3065630198f , 2);
<a name="l00161"></a>00161 B08 = A08 + A11;
<a name="l00162"></a>00162 B09 = A09 + A10;
<a name="l00163"></a>00163 B10 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((A08 - A11) , 0.5411961079f , 1);
<a name="l00164"></a>00164 B11 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((A09 - A10) , 1.3065630198f , 2);
<a name="l00165"></a>00165 B12 = A12 + A15;
<a name="l00166"></a>00166 B13 = A13 + A14;
<a name="l00167"></a>00167 B14 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((A12 - A15) , 0.5411961079f , 1);
<a name="l00168"></a>00168 B15 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((A13 - A14) , 1.3065630198f , 2);
<a name="l00169"></a>00169
<a name="l00170"></a>00170 A00 = B00 + B01;
<a name="l00171"></a>00171 A01 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((B00 - B01) , 0.7071067691f , 1);
<a name="l00172"></a>00172 A02 = B02 + B03;
<a name="l00173"></a>00173 A03 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((B02 - B03) , 0.7071067691f , 1);
<a name="l00174"></a>00174 A04 = B04 + B05;
<a name="l00175"></a>00175 A05 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((B04 - B05) , 0.7071067691f , 1);
<a name="l00176"></a>00176 A06 = B06 + B07;
<a name="l00177"></a>00177 A07 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((B06 - B07) , 0.7071067691f , 1);
<a name="l00178"></a>00178 A08 = B08 + B09;
<a name="l00179"></a>00179 A09 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((B08 - B09) , 0.7071067691f , 1);
<a name="l00180"></a>00180 A10 = B10 + B11;
<a name="l00181"></a>00181 A11 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((B10 - B11) , 0.7071067691f , 1);
<a name="l00182"></a>00182 A12 = B12 + B13;
<a name="l00183"></a>00183 A13 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((B12 - B13) , 0.7071067691f , 1);
<a name="l00184"></a>00184 A14 = B14 + B15;
<a name="l00185"></a>00185 A15 = <a class="code" href="math_8h.html#a7">MPC_MULTIPLY_FRACT_CONST_FIX</a>((B14 - B15) , 0.7071067691f , 1);
<a name="l00186"></a>00186
<a name="l00187"></a>00187 V[48] = -A00;
<a name="l00188"></a>00188 V[ 0] = A01;
<a name="l00189"></a>00189 V[40] = -A02 - (V[ 8] = A03);
<a name="l00190"></a>00190 V[36] = -((V[ 4] = A05 + (V[12] = A07)) + A06);
<a name="l00191"></a>00191 V[44] = - A04 - A06 - A07;
<a name="l00192"></a>00192 V[ 6] = (V[10] = A11 + (V[14] = A15)) + A13;
<a name="l00193"></a>00193 V[38] = (V[34] = -(V[ 2] = A09 + A13 + A15) - A14) + A09 - A10 - A11;
<a name="l00194"></a>00194 V[46] = (tmp = -(A12 + A14 + A15)) - A08;
<a name="l00195"></a>00195 V[42] = tmp - A10 - A11;
<a name="l00196"></a>00196
<a name="l00197"></a>00197 A00 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 0] - Sample[31]) , 0.5006030202f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00198"></a>00198 A01 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 1] - Sample[30]) , 0.5054709315f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00199"></a>00199 A02 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 2] - Sample[29]) , 0.5154473186f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00200"></a>00200 A03 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 3] - Sample[28]) , 0.5310425758f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00201"></a>00201 A04 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 4] - Sample[27]) , 0.5531039238f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00202"></a>00202 A05 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 5] - Sample[26]) , 0.5829349756f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00203"></a>00203 A06 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 6] - Sample[25]) , 0.6225041151f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00204"></a>00204 A07 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 7] - Sample[24]) , 0.6748083234f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00205"></a>00205 A08 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 8] - Sample[23]) , 0.7445362806f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00206"></a>00206 A09 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[ 9] - Sample[22]) , 0.8393496275f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00207"></a>00207 A10 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[10] - Sample[21]) , 0.9725682139f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00208"></a>00208 <span class="preprocessor">#if MPC_FIXED_POINT_SYNTH_FIX>=2</span>
<a name="l00209"></a>00209 <span class="preprocessor"></span> A11 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[11] - Sample[20]) , 1.1694399118f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00210"></a>00210 A12 = <a class="code" href="math_8h.html#a6">MPC_MULTIPLY_FRACT_CONST_SHR</a>((Sample[12] - Sample[19]) , 1.4841645956f , <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00211"></a>00211 <span class="preprocessor">#else</span>
<a name="l00212"></a>00212 <span class="preprocessor"></span> A11 = <a class="code" href="math_8h.html#a13">MPC_SCALE_CONST_SHR</a> ((Sample[11] - Sample[20]) , 1.1694399118f , 30, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00213"></a>00213 A12 = <a class="code" href="math_8h.html#a13">MPC_SCALE_CONST_SHR</a> ((Sample[12] - Sample[19]) , 1.4841645956f , 30, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00214"></a>00214 <span class="preprocessor">#endif</span>
<a name="l00215"></a>00215 <span class="preprocessor"></span> A13 = <a class="code" href="math_8h.html#a13">MPC_SCALE_CONST_SHR</a> ((Sample[13] - Sample[18]) , 2.0577809811f , 29, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00216"></a>00216 A14 = <a class="code" href="math_8h.html#a13">MPC_SCALE_CONST_SHR</a> ((Sample[14] - Sample[17]) , 3.4076085091f , 29, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00217"></a>00217 A15 = <a class="code" href="math_8h.html#a13">MPC_SCALE_CONST_SHR</a> ((Sample[15] - Sample[16]) , 10.1900081635f, 27 ,<a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00218"></a>00218
<a name="l00219"></a>00219 B00 = A00 + A15;
<a name="l00220"></a>00220 B01 = A01 + A14;
<a name="l00221"></a>00221 B02 = A02 + A13;
<a name="l00222"></a>00222 B03 = A03 + A12;
<a name="l00223"></a>00223 B04 = A04 + A11;
<a name="l00224"></a>00224 B05 = A05 + A10;
<a name="l00225"></a>00225 B06 = A06 + A09;
<a name="l00226"></a>00226 B07 = A07 + A08;
<a name="l00227"></a>00227 B08 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A00 - A15) , 0.5024192929f , 31);
<a name="l00228"></a>00228 B09 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A01 - A14) , 0.5224986076f , 31);
<a name="l00229"></a>00229 B10 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A02 - A13) , 0.5669440627f , 31);
<a name="l00230"></a>00230 B11 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A03 - A12) , 0.6468217969f , 31);
<a name="l00231"></a>00231 B12 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A04 - A11) , 0.7881546021f , 31);
<a name="l00232"></a>00232 B13 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A05 - A10) , 1.0606776476f , 30);
<a name="l00233"></a>00233 B14 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A06 - A09) , 1.7224471569f , 30);
<a name="l00234"></a>00234 B15 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A07 - A08) , 5.1011486053f , 28);
<a name="l00235"></a>00235
<a name="l00236"></a>00236 A00 = B00 + B07;
<a name="l00237"></a>00237 A01 = B01 + B06;
<a name="l00238"></a>00238 A02 = B02 + B05;
<a name="l00239"></a>00239 A03 = B03 + B04;
<a name="l00240"></a>00240 A04 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B00 - B07) , 0.5097956061f , 31);
<a name="l00241"></a>00241 A05 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B01 - B06) , 0.6013448834f , 31);
<a name="l00242"></a>00242 A06 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B02 - B05) , 0.8999761939f , 31);
<a name="l00243"></a>00243 A07 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B03 - B04) , 2.5629155636f , 29);
<a name="l00244"></a>00244 A08 = B08 + B15;
<a name="l00245"></a>00245 A09 = B09 + B14;
<a name="l00246"></a>00246 A10 = B10 + B13;
<a name="l00247"></a>00247 A11 = B11 + B12;
<a name="l00248"></a>00248 A12 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B08 - B15) , 0.5097956061f , 31);
<a name="l00249"></a>00249 A13 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B09 - B14) , 0.6013448834f , 31);
<a name="l00250"></a>00250 A14 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B10 - B13) , 0.8999761939f , 31);
<a name="l00251"></a>00251 A15 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((B11 - B12) , 2.5629155636f , 29);
<a name="l00252"></a>00252
<a name="l00253"></a>00253 B00 = A00 + A03;
<a name="l00254"></a>00254 B01 = A01 + A02;
<a name="l00255"></a>00255 B02 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A00 - A03) , 0.5411961079f , 31);
<a name="l00256"></a>00256 B03 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A01 - A02) , 1.3065630198f , 30);
<a name="l00257"></a>00257 B04 = A04 + A07;
<a name="l00258"></a>00258 B05 = A05 + A06;
<a name="l00259"></a>00259 B06 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A04 - A07) , 0.5411961079f , 31);
<a name="l00260"></a>00260 B07 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A05 - A06) , 1.3065630198f , 30);
<a name="l00261"></a>00261 B08 = A08 + A11;
<a name="l00262"></a>00262 B09 = A09 + A10;
<a name="l00263"></a>00263 B10 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A08 - A11) , 0.5411961079f , 31);
<a name="l00264"></a>00264 B11 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A09 - A10) , 1.3065630198f , 30);
<a name="l00265"></a>00265 B12 = A12 + A15;
<a name="l00266"></a>00266 B13 = A13 + A14;
<a name="l00267"></a>00267 B14 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A12 - A15) , 0.5411961079f , 31);
<a name="l00268"></a>00268 B15 = <a class="code" href="math_8h.html#a11">MPC_SCALE_CONST</a>((A13 - A14) , 1.3065630198f , 30);
<a name="l00269"></a>00269
<a name="l00270"></a>00270 A00 = <a class="code" href="math_8h.html#a15">MPC_SHL</a>(B00 + B01, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00271"></a>00271 A01 = <a class="code" href="math_8h.html#a12">MPC_SCALE_CONST_SHL</a>((B00 - B01) , 0.7071067691f , 31, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00272"></a>00272 A02 = <a class="code" href="math_8h.html#a15">MPC_SHL</a>(B02 + B03, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00273"></a>00273 A03 = <a class="code" href="math_8h.html#a12">MPC_SCALE_CONST_SHL</a>((B02 - B03) , 0.7071067691f , 31, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00274"></a>00274 A04 = <a class="code" href="math_8h.html#a15">MPC_SHL</a>(B04 + B05, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00275"></a>00275 A05 = <a class="code" href="math_8h.html#a12">MPC_SCALE_CONST_SHL</a>((B04 - B05) , 0.7071067691f , 31, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00276"></a>00276 A06 = <a class="code" href="math_8h.html#a15">MPC_SHL</a>(B06 + B07, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00277"></a>00277 A07 = <a class="code" href="math_8h.html#a12">MPC_SCALE_CONST_SHL</a>((B06 - B07) , 0.7071067691f , 31, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00278"></a>00278 A08 = <a class="code" href="math_8h.html#a15">MPC_SHL</a>(B08 + B09, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00279"></a>00279 A09 = <a class="code" href="math_8h.html#a12">MPC_SCALE_CONST_SHL</a>((B08 - B09) , 0.7071067691f , 31, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00280"></a>00280 A10 = <a class="code" href="math_8h.html#a15">MPC_SHL</a>(B10 + B11, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00281"></a>00281 A11 = <a class="code" href="math_8h.html#a12">MPC_SCALE_CONST_SHL</a>((B10 - B11) , 0.7071067691f , 31, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00282"></a>00282 A12 = <a class="code" href="math_8h.html#a15">MPC_SHL</a>(B12 + B13, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00283"></a>00283 A13 = <a class="code" href="math_8h.html#a12">MPC_SCALE_CONST_SHL</a>((B12 - B13) , 0.7071067691f , 31, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00284"></a>00284 A14 = <a class="code" href="math_8h.html#a15">MPC_SHL</a>(B14 + B15, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00285"></a>00285 A15 = <a class="code" href="math_8h.html#a12">MPC_SCALE_CONST_SHL</a>((B14 - B15) , 0.7071067691f , 31, <a class="code" href="synth__filter_8c.html#a0">MPC_FIXED_POINT_SYNTH_FIX</a>);
<a name="l00286"></a>00286
<a name="l00287"></a>00287 <span class="comment">// mehrfach verwendete Ausdrcke: A04+A06+A07, A09+A13+A15</span>
<a name="l00288"></a>00288 V[ 5] = (V[11] = (V[13] = A07 + (V[15] = A15)) + A11) + A05 + A13;
<a name="l00289"></a>00289 V[ 7] = (V[ 9] = A03 + A11 + A15) + A13;
<a name="l00290"></a>00290 V[33] = -(V[ 1] = A01 + A09 + A13 + A15) - A14;
<a name="l00291"></a>00291 V[35] = -(V[ 3] = A05 + A07 + A09 + A13 + A15) - A06 - A14;
<a name="l00292"></a>00292 V[37] = (tmp = -(A10 + A11 + A13 + A14 + A15)) - A05 - A06 - A07;
<a name="l00293"></a>00293 V[39] = tmp - A02 - A03; <span class="comment">// abhngig vom Befehl drber</span>
<a name="l00294"></a>00294 V[41] = (tmp += A13 - A12) - A02 - A03; <span class="comment">// abhngig vom Befehl 2 drber</span>
<a name="l00295"></a>00295 V[43] = tmp - A04 - A06 - A07; <span class="comment">// abhngig von Befehlen 1 und 3 drber</span>
<a name="l00296"></a>00296 V[47] = (tmp = -(A08 + A12 + A14 + A15)) - A00;
<a name="l00297"></a>00297 V[45] = tmp - A04 - A06 - A07; <span class="comment">// abhngig vom Befehl drber</span>
<a name="l00298"></a>00298
<a name="l00299"></a>00299 V[32] = -V[ 0];
<a name="l00300"></a>00300 V[31] = -V[ 1];
<a name="l00301"></a>00301 V[30] = -V[ 2];
<a name="l00302"></a>00302 V[29] = -V[ 3];
<a name="l00303"></a>00303 V[28] = -V[ 4];
<a name="l00304"></a>00304 V[27] = -V[ 5];
<a name="l00305"></a>00305 V[26] = -V[ 6];
<a name="l00306"></a>00306 V[25] = -V[ 7];
<a name="l00307"></a>00307 V[24] = -V[ 8];
<a name="l00308"></a>00308 V[23] = -V[ 9];
<a name="l00309"></a>00309 V[22] = -V[10];
<a name="l00310"></a>00310 V[21] = -V[11];
<a name="l00311"></a>00311 V[20] = -V[12];
<a name="l00312"></a>00312 V[19] = -V[13];
<a name="l00313"></a>00313 V[18] = -V[14];
<a name="l00314"></a>00314 V[17] = -V[15];
<a name="l00315"></a>00315
<a name="l00316"></a>00316 V[63] = V[33];
<a name="l00317"></a>00317 V[62] = V[34];
<a name="l00318"></a>00318 V[61] = V[35];
<a name="l00319"></a>00319 V[60] = V[36];
<a name="l00320"></a>00320 V[59] = V[37];
<a name="l00321"></a>00321 V[58] = V[38];
<a name="l00322"></a>00322 V[57] = V[39];
<a name="l00323"></a>00323 V[56] = V[40];
<a name="l00324"></a>00324 V[55] = V[41];
<a name="l00325"></a>00325 V[54] = V[42];
<a name="l00326"></a>00326 V[53] = V[43];
<a name="l00327"></a>00327 V[52] = V[44];
<a name="l00328"></a>00328 V[51] = V[45];
<a name="l00329"></a>00329 V[50] = V[46];
<a name="l00330"></a>00330 V[49] = V[47];
<a name="l00331"></a>00331 }
<a name="l00332"></a>00332
<a name="l00333"></a>00333 <span class="keyword">static</span> <span class="keywordtype">void</span> Synthese_Filter_float_internal(<a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> * OutData,<a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> * V,<span class="keyword">const</span> <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> * Y)
<a name="l00334"></a>00334 {
<a name="l00335"></a>00335 mpc_uint32_t n;
<a name="l00336"></a>00336 <span class="keywordflow">for</span> ( n = 0; n < 36; n++, Y += 32 ) {
<a name="l00337"></a>00337 V -= 64;
<a name="l00338"></a>00338 Calculate_New_V ( Y, V );
<a name="l00339"></a>00339 {
<a name="l00340"></a>00340 <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> * Data = OutData;
<a name="l00341"></a>00341 <span class="keyword">const</span> <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> * D = (<span class="keyword">const</span> <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a> *) &Di_opt;
<a name="l00342"></a>00342 mpc_int32_t k;
<a name="l00343"></a>00343 <span class="comment">//mpc_int32_t tmp;</span>
<a name="l00344"></a>00344
<a name="l00345"></a>00345
<a name="l00346"></a>00346
<a name="l00347"></a>00347 <span class="keywordflow">for</span> ( k = 0; k < 32; k++, D += 16, V++ ) {
<a name="l00348"></a>00348 *Data = <a class="code" href="math_8h.html#a15">MPC_SHL</a>(
<a name="l00349"></a>00349 <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[ 0],D[ 0]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[ 96],D[ 1]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[128],D[ 2]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[224],D[ 3])
<a name="l00350"></a>00350 + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[256],D[ 4]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[352],D[ 5]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[384],D[ 6]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[480],D[ 7])
<a name="l00351"></a>00351 + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[512],D[ 8]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[608],D[ 9]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[640],D[10]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[736],D[11])
<a name="l00352"></a>00352 + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[768],D[12]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[864],D[13]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[896],D[14]) + <a class="code" href="math_8h.html#a3">MPC_MULTIPLY_FRACT</a>(V[992],D[15])
<a name="l00353"></a>00353 , 2);
<a name="l00354"></a>00354
<a name="l00355"></a>00355 Data += 2;
<a name="l00356"></a>00356 }
<a name="l00357"></a>00357 V -= 32;<span class="comment">//bleh</span>
<a name="l00358"></a>00358 OutData+=64;
<a name="l00359"></a>00359 }
<a name="l00360"></a>00360 }
<a name="l00361"></a>00361 }
<a name="l00362"></a>00362
<a name="l00363"></a>00363 <span class="keywordtype">void</span>
<a name="l00364"></a><a class="code" href="synth__filter_8c.html#a7">00364</a> <a class="code" href="internal_8h.html#a5">mpc_decoder_synthese_filter_float</a>(<a class="code" href="structmpc__decoder__t.html">mpc_decoder</a> *d, <a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a>* OutData)
<a name="l00365"></a>00365 {
<a name="l00366"></a>00366 <span class="comment">/********* left channel ********/</span>
<a name="l00367"></a>00367 memmove(d-><a class="code" href="structmpc__decoder__t.html#z0_59">V_L</a> + MPC_V_MEM, d-><a class="code" href="structmpc__decoder__t.html#z0_59">V_L</a>, 960 * <span class="keyword">sizeof</span>(<a class="code" href="math_8h.html#a16">MPC_SAMPLE_FORMAT</a>) );
<a name="l00368"></a>00368
<a name="l00369"></a>00369 Synthese_Filter_float_internal(
<a name="l00370"></a>00370 OutData,
<a name="l00371"></a>00371 (MPC_SAMPLE_FORMAT *)(d-><a class="code" href="structmpc__decoder__t.html#z0_59">V_L</a> + MPC_V_MEM),
<a name="l00372"></a>00372 (MPC_SAMPLE_FORMAT *)(d-><a class="code" href="structmpc__decoder__t.html#z0_61">Y_L</a> [0]));
<a name="l00373"></a>00373
<a name="l00374"></a>00374 <span class="comment">/******** right channel ********/</span>
<a name="l00375"></a>00375 memmove(d-><a class="code" href="structmpc__decoder__t.html#z0_60">V_R</a> + MPC_V_MEM, d-><a class="code" href="structmpc__decoder__t.html#z0_60">V_R</a>, 960 * <span class="keyword">sizeof</span>(MPC_SAMPLE_FORMAT) );
<a name="l00376"></a>00376
<a name="l00377"></a>00377 Synthese_Filter_float_internal(
<a name="l00378"></a>00378 OutData + 1,
<a name="l00379"></a>00379 (MPC_SAMPLE_FORMAT *)(d-><a class="code" href="structmpc__decoder__t.html#z0_60">V_R</a> + MPC_V_MEM),
<a name="l00380"></a>00380 (MPC_SAMPLE_FORMAT *)(d-><a class="code" href="structmpc__decoder__t.html#z0_62">Y_R</a> [0]));
<a name="l00381"></a>00381 }
<a name="l00382"></a>00382
<a name="l00383"></a>00383 <span class="comment">/*******************************************/</span>
<a name="l00384"></a>00384 <span class="comment">/* */</span>
<a name="l00385"></a>00385 <span class="comment">/* dithered synthesis */</span>
<a name="l00386"></a>00386 <span class="comment">/* */</span>
<a name="l00387"></a>00387 <span class="comment">/*******************************************/</span>
<a name="l00388"></a>00388
<a name="l00389"></a>00389 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> Parity [256] = { <span class="comment">// parity</span>
<a name="l00390"></a>00390 0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,
<a name="l00391"></a>00391 1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,
<a name="l00392"></a>00392 1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,
<a name="l00393"></a>00393 0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,
<a name="l00394"></a>00394 1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,
<a name="l00395"></a>00395 0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,
<a name="l00396"></a>00396 0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,
<a name="l00397"></a>00397 1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0
<a name="l00398"></a>00398 };
<a name="l00399"></a>00399
<a name="l00400"></a>00400 <span class="comment">/*</span>
<a name="l00401"></a>00401 <span class="comment"> * This is a simple random number generator with good quality for audio purposes.</span>
<a name="l00402"></a>00402 <span class="comment"> * It consists of two polycounters with opposite rotation direction and different</span>
<a name="l00403"></a>00403 <span class="comment"> * periods. The periods are coprime, so the total period is the product of both.</span>
<a name="l00404"></a>00404 <span class="comment"> *</span>
<a name="l00405"></a>00405 <span class="comment"> * -------------------------------------------------------------------------------------------------</span>
<a name="l00406"></a>00406 <span class="comment"> * +-> |31:30:29:28:27:26:25:24:23:22:21:20:19:18:17:16:15:14:13:12:11:10: 9: 8: 7: 6: 5: 4: 3: 2: 1: 0|</span>
<a name="l00407"></a>00407 <span class="comment"> * | -------------------------------------------------------------------------------------------------</span>
<a name="l00408"></a>00408 <span class="comment"> * | | | | | | |</span>
<a name="l00409"></a>00409 <span class="comment"> * | +--+--+--+-XOR-+--------+</span>
<a name="l00410"></a>00410 <span class="comment"> * | |</span>
<a name="l00411"></a>00411 <span class="comment"> * +--------------------------------------------------------------------------------------+</span>
<a name="l00412"></a>00412 <span class="comment"> *</span>
<a name="l00413"></a>00413 <span class="comment"> * -------------------------------------------------------------------------------------------------</span>
<a name="l00414"></a>00414 <span class="comment"> * |31:30:29:28:27:26:25:24:23:22:21:20:19:18:17:16:15:14:13:12:11:10: 9: 8: 7: 6: 5: 4: 3: 2: 1: 0| <-+</span>
<a name="l00415"></a>00415 <span class="comment"> * ------------------------------------------------------------------------------------------------- |</span>
<a name="l00416"></a>00416 <span class="comment"> * | | | | |</span>
<a name="l00417"></a>00417 <span class="comment"> * +--+----XOR----+--+ |</span>
<a name="l00418"></a>00418 <span class="comment"> * | |</span>
<a name="l00419"></a>00419 <span class="comment"> * +----------------------------------------------------------------------------------------+</span>
<a name="l00420"></a>00420 <span class="comment"> *</span>
<a name="l00421"></a>00421 <span class="comment"> *</span>
<a name="l00422"></a>00422 <span class="comment"> * The first has an period of 3*5*17*257*65537, the second of 7*47*73*178481,</span>
<a name="l00423"></a>00423 <span class="comment"> * which gives a period of 18.410.713.077.675.721.215. The result is the</span>
<a name="l00424"></a>00424 <span class="comment"> * XORed values of both generators.</span>
<a name="l00425"></a>00425 <span class="comment"> */</span>
<a name="l00426"></a>00426 mpc_uint32_t
<a name="l00427"></a><a class="code" href="synth__filter_8c.html#a8">00427</a> <a class="code" href="internal_8h.html#a3">mpc_random_int</a>(<a class="code" href="structmpc__decoder__t.html">mpc_decoder</a> *d)
<a name="l00428"></a>00428 {
<a name="l00429"></a>00429 <span class="preprocessor">#if 1</span>
<a name="l00430"></a>00430 <span class="preprocessor"></span> mpc_uint32_t t1, t2, t3, t4;
<a name="l00431"></a>00431
<a name="l00432"></a>00432 t3 = t1 = d-><a class="code" href="structmpc__decoder__t.html#z0_19">__r1</a>; t4 = t2 = d-><a class="code" href="structmpc__decoder__t.html#z0_20">__r2</a>; <span class="comment">// Parity calculation is done via table lookup, this is also available</span>
<a name="l00433"></a>00433 t1 &= 0xF5; t2 >>= 25; <span class="comment">// on CPUs without parity, can be implemented in C and avoid unpredictable</span>
<a name="l00434"></a>00434 t1 = Parity [t1]; t2 &= 0x63; <span class="comment">// jumps and slow rotate through the carry flag operations.</span>
<a name="l00435"></a>00435 t1 <<= 31; t2 = Parity [t2];
<a name="l00436"></a>00436
<a name="l00437"></a>00437 <span class="keywordflow">return</span> (d-><a class="code" href="structmpc__decoder__t.html#z0_19">__r1</a> = (t3 >> 1) | t1 ) ^ (d-><a class="code" href="structmpc__decoder__t.html#z0_20">__r2</a> = (t4 + t4) | t2 );
<a name="l00438"></a>00438 <span class="preprocessor">#else</span>
<a name="l00439"></a>00439 <span class="preprocessor"></span> <span class="keywordflow">return</span> (d-><a class="code" href="structmpc__decoder__t.html#z0_19">__r1</a> = (d-><a class="code" href="structmpc__decoder__t.html#z0_19">__r1</a> >> 1) | ((mpc_uint32_t)Parity [d-><a class="code" href="structmpc__decoder__t.html#z0_19">__r1</a> & 0xF5] << 31) ) ^
<a name="l00440"></a>00440 (d-><a class="code" href="structmpc__decoder__t.html#z0_20">__r2</a> = (d-><a class="code" href="structmpc__decoder__t.html#z0_20">__r2</a> << 1) | (mpc_uint32_t)Parity [(d-><a class="code" href="structmpc__decoder__t.html#z0_20">__r2</a> >> 25) & 0x63] );
<a name="l00441"></a>00441 <span class="preprocessor">#endif</span>
<a name="l00442"></a>00442 <span class="preprocessor"></span>}
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