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| 4349 | Serge | 1 | /* |
| 2 | * Floating point AAN DCT |
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| 3 | * this implementation is based upon the IJG integer AAN DCT (see jfdctfst.c) |
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| 4 | * |
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| 5 | * Copyright (c) 2003 Michael Niedermayer |
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| 6 | * Copyright (c) 2003 Roman Shaposhnik |
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| 7 | * |
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| 8 | * Permission to use, copy, modify, and/or distribute this software for any |
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| 9 | * purpose with or without fee is hereby granted, provided that the above |
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| 10 | * copyright notice and this permission notice appear in all copies. |
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| 11 | * |
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| 12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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| 13 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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| 14 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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| 15 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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| 16 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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| 17 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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| 18 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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| 19 | */ |
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| 20 | |||
| 21 | /** |
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| 22 | * @file |
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| 23 | * @brief |
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| 24 | * Floating point AAN DCT |
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| 25 | * @author Michael Niedermayer |
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| 26 | */ |
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| 27 | |||
| 28 | #include "faandct.h" |
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| 29 | #include "libavutil/internal.h" |
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| 30 | #include "libavutil/libm.h" |
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| 31 | |||
| 32 | #define FLOAT float |
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| 33 | |||
| 34 | //numbers generated by simple c code (not as accurate as they could be) |
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| 35 | /* |
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| 36 | for(i=0; i<8; i++){ |
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| 37 | printf("#define B%d %1.20llf\n", i, (long double)1.0/(cosl(i*acosl(-1.0)/(long double)16.0)*sqrtl(2))); |
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| 38 | } |
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| 39 | */ |
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| 40 | #define B0 1.00000000000000000000 |
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| 41 | #define B1 0.72095982200694791383 // (cos(pi*1/16)sqrt(2))^-1 |
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| 42 | #define B2 0.76536686473017954350 // (cos(pi*2/16)sqrt(2))^-1 |
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| 43 | #define B3 0.85043009476725644878 // (cos(pi*3/16)sqrt(2))^-1 |
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| 44 | #define B4 1.00000000000000000000 // (cos(pi*4/16)sqrt(2))^-1 |
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| 45 | #define B5 1.27275858057283393842 // (cos(pi*5/16)sqrt(2))^-1 |
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| 46 | #define B6 1.84775906502257351242 // (cos(pi*6/16)sqrt(2))^-1 |
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| 47 | #define B7 3.62450978541155137218 // (cos(pi*7/16)sqrt(2))^-1 |
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| 48 | |||
| 49 | |||
| 50 | #define A1 0.70710678118654752438 // cos(pi*4/16) |
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| 51 | #define A2 0.54119610014619698435 // cos(pi*6/16)sqrt(2) |
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| 52 | #define A5 0.38268343236508977170 // cos(pi*6/16) |
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| 53 | #define A4 1.30656296487637652774 // cos(pi*2/16)sqrt(2) |
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| 54 | |||
| 55 | static const FLOAT postscale[64]={ |
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| 56 | B0*B0, B0*B1, B0*B2, B0*B3, B0*B4, B0*B5, B0*B6, B0*B7, |
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| 57 | B1*B0, B1*B1, B1*B2, B1*B3, B1*B4, B1*B5, B1*B6, B1*B7, |
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| 58 | B2*B0, B2*B1, B2*B2, B2*B3, B2*B4, B2*B5, B2*B6, B2*B7, |
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| 59 | B3*B0, B3*B1, B3*B2, B3*B3, B3*B4, B3*B5, B3*B6, B3*B7, |
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| 60 | B4*B0, B4*B1, B4*B2, B4*B3, B4*B4, B4*B5, B4*B6, B4*B7, |
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| 61 | B5*B0, B5*B1, B5*B2, B5*B3, B5*B4, B5*B5, B5*B6, B5*B7, |
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| 62 | B6*B0, B6*B1, B6*B2, B6*B3, B6*B4, B6*B5, B6*B6, B6*B7, |
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| 63 | B7*B0, B7*B1, B7*B2, B7*B3, B7*B4, B7*B5, B7*B6, B7*B7, |
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| 64 | }; |
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| 65 | |||
| 66 | static av_always_inline void row_fdct(FLOAT temp[64], int16_t *data) |
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| 67 | { |
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| 68 | FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
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| 69 | FLOAT tmp10, tmp11, tmp12, tmp13; |
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| 70 | FLOAT z2, z4, z11, z13; |
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| 71 | FLOAT av_unused z5; |
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| 72 | int i; |
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| 73 | |||
| 74 | for (i=0; i<8*8; i+=8) { |
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| 75 | tmp0= data[0 + i] + data[7 + i]; |
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| 76 | tmp7= data[0 + i] - data[7 + i]; |
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| 77 | tmp1= data[1 + i] + data[6 + i]; |
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| 78 | tmp6= data[1 + i] - data[6 + i]; |
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| 79 | tmp2= data[2 + i] + data[5 + i]; |
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| 80 | tmp5= data[2 + i] - data[5 + i]; |
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| 81 | tmp3= data[3 + i] + data[4 + i]; |
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| 82 | tmp4= data[3 + i] - data[4 + i]; |
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| 83 | |||
| 84 | tmp10= tmp0 + tmp3; |
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| 85 | tmp13= tmp0 - tmp3; |
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| 86 | tmp11= tmp1 + tmp2; |
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| 87 | tmp12= tmp1 - tmp2; |
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| 88 | |||
| 89 | temp[0 + i]= tmp10 + tmp11; |
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| 90 | temp[4 + i]= tmp10 - tmp11; |
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| 91 | |||
| 92 | tmp12 += tmp13; |
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| 93 | tmp12 *= A1; |
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| 94 | temp[2 + i]= tmp13 + tmp12; |
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| 95 | temp[6 + i]= tmp13 - tmp12; |
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| 96 | |||
| 97 | tmp4 += tmp5; |
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| 98 | tmp5 += tmp6; |
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| 99 | tmp6 += tmp7; |
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| 100 | |||
| 101 | #if 0 |
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| 102 | z5= (tmp4 - tmp6) * A5; |
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| 103 | z2= tmp4*A2 + z5; |
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| 104 | z4= tmp6*A4 + z5; |
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| 105 | #else |
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| 106 | z2= tmp4*(A2+A5) - tmp6*A5; |
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| 107 | z4= tmp6*(A4-A5) + tmp4*A5; |
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| 108 | #endif |
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| 109 | tmp5*=A1; |
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| 110 | |||
| 111 | z11= tmp7 + tmp5; |
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| 112 | z13= tmp7 - tmp5; |
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| 113 | |||
| 114 | temp[5 + i]= z13 + z2; |
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| 115 | temp[3 + i]= z13 - z2; |
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| 116 | temp[1 + i]= z11 + z4; |
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| 117 | temp[7 + i]= z11 - z4; |
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| 118 | } |
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| 119 | } |
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| 120 | |||
| 121 | void ff_faandct(int16_t *data) |
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| 122 | { |
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| 123 | FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
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| 124 | FLOAT tmp10, tmp11, tmp12, tmp13; |
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| 125 | FLOAT z2, z4, z11, z13; |
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| 126 | FLOAT av_unused z5; |
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| 127 | FLOAT temp[64]; |
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| 128 | int i; |
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| 129 | |||
| 130 | emms_c(); |
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| 131 | |||
| 132 | row_fdct(temp, data); |
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| 133 | |||
| 134 | for (i=0; i<8; i++) { |
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| 135 | tmp0= temp[8*0 + i] + temp[8*7 + i]; |
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| 136 | tmp7= temp[8*0 + i] - temp[8*7 + i]; |
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| 137 | tmp1= temp[8*1 + i] + temp[8*6 + i]; |
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| 138 | tmp6= temp[8*1 + i] - temp[8*6 + i]; |
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| 139 | tmp2= temp[8*2 + i] + temp[8*5 + i]; |
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| 140 | tmp5= temp[8*2 + i] - temp[8*5 + i]; |
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| 141 | tmp3= temp[8*3 + i] + temp[8*4 + i]; |
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| 142 | tmp4= temp[8*3 + i] - temp[8*4 + i]; |
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| 143 | |||
| 144 | tmp10= tmp0 + tmp3; |
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| 145 | tmp13= tmp0 - tmp3; |
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| 146 | tmp11= tmp1 + tmp2; |
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| 147 | tmp12= tmp1 - tmp2; |
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| 148 | |||
| 149 | data[8*0 + i]= lrintf(postscale[8*0 + i] * (tmp10 + tmp11)); |
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| 150 | data[8*4 + i]= lrintf(postscale[8*4 + i] * (tmp10 - tmp11)); |
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| 151 | |||
| 152 | tmp12 += tmp13; |
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| 153 | tmp12 *= A1; |
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| 154 | data[8*2 + i]= lrintf(postscale[8*2 + i] * (tmp13 + tmp12)); |
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| 155 | data[8*6 + i]= lrintf(postscale[8*6 + i] * (tmp13 - tmp12)); |
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| 156 | |||
| 157 | tmp4 += tmp5; |
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| 158 | tmp5 += tmp6; |
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| 159 | tmp6 += tmp7; |
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| 160 | |||
| 161 | #if 0 |
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| 162 | z5= (tmp4 - tmp6) * A5; |
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| 163 | z2= tmp4*A2 + z5; |
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| 164 | z4= tmp6*A4 + z5; |
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| 165 | #else |
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| 166 | z2= tmp4*(A2+A5) - tmp6*A5; |
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| 167 | z4= tmp6*(A4-A5) + tmp4*A5; |
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| 168 | #endif |
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| 169 | tmp5*=A1; |
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| 170 | |||
| 171 | z11= tmp7 + tmp5; |
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| 172 | z13= tmp7 - tmp5; |
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| 173 | |||
| 174 | data[8*5 + i]= lrintf(postscale[8*5 + i] * (z13 + z2)); |
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| 175 | data[8*3 + i]= lrintf(postscale[8*3 + i] * (z13 - z2)); |
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| 176 | data[8*1 + i]= lrintf(postscale[8*1 + i] * (z11 + z4)); |
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| 177 | data[8*7 + i]= lrintf(postscale[8*7 + i] * (z11 - z4)); |
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| 178 | } |
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| 179 | } |
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| 180 | |||
| 181 | void ff_faandct248(int16_t *data) |
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| 182 | { |
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| 183 | FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
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| 184 | FLOAT tmp10, tmp11, tmp12, tmp13; |
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| 185 | FLOAT temp[64]; |
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| 186 | int i; |
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| 187 | |||
| 188 | emms_c(); |
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| 189 | |||
| 190 | row_fdct(temp, data); |
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| 191 | |||
| 192 | for (i=0; i<8; i++) { |
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| 193 | tmp0 = temp[8*0 + i] + temp[8*1 + i]; |
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| 194 | tmp1 = temp[8*2 + i] + temp[8*3 + i]; |
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| 195 | tmp2 = temp[8*4 + i] + temp[8*5 + i]; |
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| 196 | tmp3 = temp[8*6 + i] + temp[8*7 + i]; |
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| 197 | tmp4 = temp[8*0 + i] - temp[8*1 + i]; |
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| 198 | tmp5 = temp[8*2 + i] - temp[8*3 + i]; |
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| 199 | tmp6 = temp[8*4 + i] - temp[8*5 + i]; |
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| 200 | tmp7 = temp[8*6 + i] - temp[8*7 + i]; |
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| 201 | |||
| 202 | tmp10 = tmp0 + tmp3; |
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| 203 | tmp11 = tmp1 + tmp2; |
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| 204 | tmp12 = tmp1 - tmp2; |
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| 205 | tmp13 = tmp0 - tmp3; |
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| 206 | |||
| 207 | data[8*0 + i] = lrintf(postscale[8*0 + i] * (tmp10 + tmp11)); |
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| 208 | data[8*4 + i] = lrintf(postscale[8*4 + i] * (tmp10 - tmp11)); |
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| 209 | |||
| 210 | tmp12 += tmp13; |
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| 211 | tmp12 *= A1; |
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| 212 | data[8*2 + i] = lrintf(postscale[8*2 + i] * (tmp13 + tmp12)); |
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| 213 | data[8*6 + i] = lrintf(postscale[8*6 + i] * (tmp13 - tmp12)); |
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| 214 | |||
| 215 | tmp10 = tmp4 + tmp7; |
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| 216 | tmp11 = tmp5 + tmp6; |
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| 217 | tmp12 = tmp5 - tmp6; |
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| 218 | tmp13 = tmp4 - tmp7; |
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| 219 | |||
| 220 | data[8*1 + i] = lrintf(postscale[8*0 + i] * (tmp10 + tmp11)); |
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| 221 | data[8*5 + i] = lrintf(postscale[8*4 + i] * (tmp10 - tmp11)); |
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| 222 | |||
| 223 | tmp12 += tmp13; |
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| 224 | tmp12 *= A1; |
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| 225 | data[8*3 + i] = lrintf(postscale[8*2 + i] * (tmp13 + tmp12)); |
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| 226 | data[8*7 + i] = lrintf(postscale[8*6 + i] * (tmp13 - tmp12)); |
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| 227 | } |
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| 228 | } |