Libav 0.7.1
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00001 /* 00002 * Floating point AAN DCT 00003 * this implementation is based upon the IJG integer AAN DCT (see jfdctfst.c) 00004 * 00005 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> 00006 * Copyright (c) 2003 Roman Shaposhnik 00007 * 00008 * Permission to use, copy, modify, and/or distribute this software for any 00009 * purpose with or without fee is hereby granted, provided that the above 00010 * copyright notice and this permission notice appear in all copies. 00011 * 00012 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 00013 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 00014 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 00015 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 00016 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 00017 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 00018 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 00019 */ 00020 00028 #include "dsputil.h" 00029 #include "faandct.h" 00030 00031 #define FLOAT float 00032 #ifdef FAAN_POSTSCALE 00033 # define SCALE(x) postscale[x] 00034 #else 00035 # define SCALE(x) 1 00036 #endif 00037 00038 //numbers generated by simple c code (not as accurate as they could be) 00039 /* 00040 for(i=0; i<8; i++){ 00041 printf("#define B%d %1.20llf\n", i, (long double)1.0/(cosl(i*acosl(-1.0)/(long double)16.0)*sqrtl(2))); 00042 } 00043 */ 00044 #define B0 1.00000000000000000000 00045 #define B1 0.72095982200694791383 // (cos(pi*1/16)sqrt(2))^-1 00046 #define B2 0.76536686473017954350 // (cos(pi*2/16)sqrt(2))^-1 00047 #define B3 0.85043009476725644878 // (cos(pi*3/16)sqrt(2))^-1 00048 #define B4 1.00000000000000000000 // (cos(pi*4/16)sqrt(2))^-1 00049 #define B5 1.27275858057283393842 // (cos(pi*5/16)sqrt(2))^-1 00050 #define B6 1.84775906502257351242 // (cos(pi*6/16)sqrt(2))^-1 00051 #define B7 3.62450978541155137218 // (cos(pi*7/16)sqrt(2))^-1 00052 00053 00054 #define A1 0.70710678118654752438 // cos(pi*4/16) 00055 #define A2 0.54119610014619698435 // cos(pi*6/16)sqrt(2) 00056 #define A5 0.38268343236508977170 // cos(pi*6/16) 00057 #define A4 1.30656296487637652774 // cos(pi*2/16)sqrt(2) 00058 00059 static const FLOAT postscale[64]={ 00060 B0*B0, B0*B1, B0*B2, B0*B3, B0*B4, B0*B5, B0*B6, B0*B7, 00061 B1*B0, B1*B1, B1*B2, B1*B3, B1*B4, B1*B5, B1*B6, B1*B7, 00062 B2*B0, B2*B1, B2*B2, B2*B3, B2*B4, B2*B5, B2*B6, B2*B7, 00063 B3*B0, B3*B1, B3*B2, B3*B3, B3*B4, B3*B5, B3*B6, B3*B7, 00064 B4*B0, B4*B1, B4*B2, B4*B3, B4*B4, B4*B5, B4*B6, B4*B7, 00065 B5*B0, B5*B1, B5*B2, B5*B3, B5*B4, B5*B5, B5*B6, B5*B7, 00066 B6*B0, B6*B1, B6*B2, B6*B3, B6*B4, B6*B5, B6*B6, B6*B7, 00067 B7*B0, B7*B1, B7*B2, B7*B3, B7*B4, B7*B5, B7*B6, B7*B7, 00068 }; 00069 00070 static av_always_inline void row_fdct(FLOAT temp[64], DCTELEM * data) 00071 { 00072 FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; 00073 FLOAT tmp10, tmp11, tmp12, tmp13; 00074 FLOAT z2, z4, z11, z13; 00075 FLOAT av_unused z5; 00076 int i; 00077 00078 for (i=0; i<8*8; i+=8) { 00079 tmp0= data[0 + i] + data[7 + i]; 00080 tmp7= data[0 + i] - data[7 + i]; 00081 tmp1= data[1 + i] + data[6 + i]; 00082 tmp6= data[1 + i] - data[6 + i]; 00083 tmp2= data[2 + i] + data[5 + i]; 00084 tmp5= data[2 + i] - data[5 + i]; 00085 tmp3= data[3 + i] + data[4 + i]; 00086 tmp4= data[3 + i] - data[4 + i]; 00087 00088 tmp10= tmp0 + tmp3; 00089 tmp13= tmp0 - tmp3; 00090 tmp11= tmp1 + tmp2; 00091 tmp12= tmp1 - tmp2; 00092 00093 temp[0 + i]= tmp10 + tmp11; 00094 temp[4 + i]= tmp10 - tmp11; 00095 00096 tmp12 += tmp13; 00097 tmp12 *= A1; 00098 temp[2 + i]= tmp13 + tmp12; 00099 temp[6 + i]= tmp13 - tmp12; 00100 00101 tmp4 += tmp5; 00102 tmp5 += tmp6; 00103 tmp6 += tmp7; 00104 00105 #if 0 00106 z5= (tmp4 - tmp6) * A5; 00107 z2= tmp4*A2 + z5; 00108 z4= tmp6*A4 + z5; 00109 #else 00110 z2= tmp4*(A2+A5) - tmp6*A5; 00111 z4= tmp6*(A4-A5) + tmp4*A5; 00112 #endif 00113 tmp5*=A1; 00114 00115 z11= tmp7 + tmp5; 00116 z13= tmp7 - tmp5; 00117 00118 temp[5 + i]= z13 + z2; 00119 temp[3 + i]= z13 - z2; 00120 temp[1 + i]= z11 + z4; 00121 temp[7 + i]= z11 - z4; 00122 } 00123 } 00124 00125 void ff_faandct(DCTELEM * data) 00126 { 00127 FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; 00128 FLOAT tmp10, tmp11, tmp12, tmp13; 00129 FLOAT z2, z4, z11, z13; 00130 FLOAT av_unused z5; 00131 FLOAT temp[64]; 00132 int i; 00133 00134 emms_c(); 00135 00136 row_fdct(temp, data); 00137 00138 for (i=0; i<8; i++) { 00139 tmp0= temp[8*0 + i] + temp[8*7 + i]; 00140 tmp7= temp[8*0 + i] - temp[8*7 + i]; 00141 tmp1= temp[8*1 + i] + temp[8*6 + i]; 00142 tmp6= temp[8*1 + i] - temp[8*6 + i]; 00143 tmp2= temp[8*2 + i] + temp[8*5 + i]; 00144 tmp5= temp[8*2 + i] - temp[8*5 + i]; 00145 tmp3= temp[8*3 + i] + temp[8*4 + i]; 00146 tmp4= temp[8*3 + i] - temp[8*4 + i]; 00147 00148 tmp10= tmp0 + tmp3; 00149 tmp13= tmp0 - tmp3; 00150 tmp11= tmp1 + tmp2; 00151 tmp12= tmp1 - tmp2; 00152 00153 data[8*0 + i]= lrintf(SCALE(8*0 + i) * (tmp10 + tmp11)); 00154 data[8*4 + i]= lrintf(SCALE(8*4 + i) * (tmp10 - tmp11)); 00155 00156 tmp12 += tmp13; 00157 tmp12 *= A1; 00158 data[8*2 + i]= lrintf(SCALE(8*2 + i) * (tmp13 + tmp12)); 00159 data[8*6 + i]= lrintf(SCALE(8*6 + i) * (tmp13 - tmp12)); 00160 00161 tmp4 += tmp5; 00162 tmp5 += tmp6; 00163 tmp6 += tmp7; 00164 00165 #if 0 00166 z5= (tmp4 - tmp6) * A5; 00167 z2= tmp4*A2 + z5; 00168 z4= tmp6*A4 + z5; 00169 #else 00170 z2= tmp4*(A2+A5) - tmp6*A5; 00171 z4= tmp6*(A4-A5) + tmp4*A5; 00172 #endif 00173 tmp5*=A1; 00174 00175 z11= tmp7 + tmp5; 00176 z13= tmp7 - tmp5; 00177 00178 data[8*5 + i]= lrintf(SCALE(8*5 + i) * (z13 + z2)); 00179 data[8*3 + i]= lrintf(SCALE(8*3 + i) * (z13 - z2)); 00180 data[8*1 + i]= lrintf(SCALE(8*1 + i) * (z11 + z4)); 00181 data[8*7 + i]= lrintf(SCALE(8*7 + i) * (z11 - z4)); 00182 } 00183 } 00184 00185 void ff_faandct248(DCTELEM * data) 00186 { 00187 FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; 00188 FLOAT tmp10, tmp11, tmp12, tmp13; 00189 FLOAT temp[64]; 00190 int i; 00191 00192 emms_c(); 00193 00194 row_fdct(temp, data); 00195 00196 for (i=0; i<8; i++) { 00197 tmp0 = temp[8*0 + i] + temp[8*1 + i]; 00198 tmp1 = temp[8*2 + i] + temp[8*3 + i]; 00199 tmp2 = temp[8*4 + i] + temp[8*5 + i]; 00200 tmp3 = temp[8*6 + i] + temp[8*7 + i]; 00201 tmp4 = temp[8*0 + i] - temp[8*1 + i]; 00202 tmp5 = temp[8*2 + i] - temp[8*3 + i]; 00203 tmp6 = temp[8*4 + i] - temp[8*5 + i]; 00204 tmp7 = temp[8*6 + i] - temp[8*7 + i]; 00205 00206 tmp10 = tmp0 + tmp3; 00207 tmp11 = tmp1 + tmp2; 00208 tmp12 = tmp1 - tmp2; 00209 tmp13 = tmp0 - tmp3; 00210 00211 data[8*0 + i] = lrintf(SCALE(8*0 + i) * (tmp10 + tmp11)); 00212 data[8*4 + i] = lrintf(SCALE(8*4 + i) * (tmp10 - tmp11)); 00213 00214 tmp12 += tmp13; 00215 tmp12 *= A1; 00216 data[8*2 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + tmp12)); 00217 data[8*6 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - tmp12)); 00218 00219 tmp10 = tmp4 + tmp7; 00220 tmp11 = tmp5 + tmp6; 00221 tmp12 = tmp5 - tmp6; 00222 tmp13 = tmp4 - tmp7; 00223 00224 data[8*1 + i] = lrintf(SCALE(8*0 + i) * (tmp10 + tmp11)); 00225 data[8*5 + i] = lrintf(SCALE(8*4 + i) * (tmp10 - tmp11)); 00226 00227 tmp12 += tmp13; 00228 tmp12 *= A1; 00229 data[8*3 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + tmp12)); 00230 data[8*7 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - tmp12)); 00231 } 00232 }