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| 1 : | edgomez | 1.9 | /************************************************************************** |
| 2 : | Isibaar | 1.1 | * |
| 3 : | edgomez | 1.9 | * XVID MPEG-4 VIDEO CODEC |
| 4 : | * mpeg-4 quantization/dequantization | ||
| 5 : | Isibaar | 1.1 | * |
| 6 : | edgomez | 1.9 | * This program is an implementation of a part of one or more MPEG-4 |
| 7 : | * Video tools as specified in ISO/IEC 14496-2 standard. Those intending | ||
| 8 : | * to use this software module in hardware or software products are | ||
| 9 : | * advised that its use may infringe existing patents or copyrights, and | ||
| 10 : | * any such use would be at such party's own risk. The original | ||
| 11 : | * developer of this software module and his/her company, and subsequent | ||
| 12 : | * editors and their companies, will have no liability for use of this | ||
| 13 : | * software or modifications or derivatives thereof. | ||
| 14 : | Isibaar | 1.1 | * |
| 15 : | edgomez | 1.9 | * This program is free software; you can redistribute it and/or modify |
| 16 : | * it under the terms of the GNU General Public License as published by | ||
| 17 : | * the Free Software Foundation; either version 2 of the License, or | ||
| 18 : | * (at your option) any later version. | ||
| 19 : | edgomez | 1.6 | * |
| 20 : | edgomez | 1.9 | * This program is distributed in the hope that it will be useful, |
| 21 : | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 22 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 23 : | * GNU General Public License for more details. | ||
| 24 : | edgomez | 1.4 | * |
| 25 : | edgomez | 1.9 | * You should have received a copy of the GNU General Public License |
| 26 : | * along with this program; if not, write to the Free Software | ||
| 27 : | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| 28 : | edgomez | 1.4 | * |
| 29 : | edgomez | 1.9 | *************************************************************************/ |
| 30 : | |||
| 31 : | /************************************************************************** | ||
| 32 : | edgomez | 1.6 | * |
| 33 : | edgomez | 1.9 | * History: |
| 34 : | edgomez | 1.6 | * |
| 35 : | edgomez | 1.9 | * 26.01.2002 fixed quant4_intra dcscalar signed/unsigned error |
| 36 : | * 20.01.2002 increased accuracy of >> divide | ||
| 37 : | * 26.12.2001 divide-by-multiplication optimization | ||
| 38 : | * 22.12.2001 [-127,127] clamping removed; minor tweaks | ||
| 39 : | * 19.11.2001 inital version <pross@cs.rmit.edu.au> | ||
| 40 : | edgomez | 1.6 | * |
| 41 : | edgomez | 1.9 | *************************************************************************/ |
| 42 : | Isibaar | 1.1 | |
| 43 : | edgomez | 1.9 | #include "../global.h" |
| 44 : | Isibaar | 1.1 | #include "quant_mpeg4.h" |
| 45 : | Isibaar | 1.2 | #include "quant_matrix.h" |
| 46 : | Isibaar | 1.1 | |
| 47 : | edgomez | 1.9 | // function pointers |
| 48 : | Isibaar | 1.1 | quant_intraFuncPtr quant4_intra; |
| 49 : | quant_intraFuncPtr dequant4_intra; | ||
| 50 : | dequant_interFuncPtr dequant4_inter; | ||
| 51 : | quant_interFuncPtr quant4_inter; | ||
| 52 : | |||
| 53 : | |||
| 54 : | #define VM18P 3 | ||
| 55 : | #define VM18Q 4 | ||
| 56 : | |||
| 57 : | |||
| 58 : | edgomez | 1.9 | // divide-by-multiply table |
| 59 : | // need 17 bit shift (16 causes slight errors when q > 19) | ||
| 60 : | Isibaar | 1.1 | |
| 61 : | #define SCALEBITS 17 | ||
| 62 : | #define FIX(X) ((1UL << SCALEBITS) / (X) + 1) | ||
| 63 : | |||
| 64 : | edgomez | 1.3 | static const uint32_t multipliers[32] = { |
| 65 : | 0, FIX(2), FIX(4), FIX(6), | ||
| 66 : | FIX(8), FIX(10), FIX(12), FIX(14), | ||
| 67 : | FIX(16), FIX(18), FIX(20), FIX(22), | ||
| 68 : | FIX(24), FIX(26), FIX(28), FIX(30), | ||
| 69 : | FIX(32), FIX(34), FIX(36), FIX(38), | ||
| 70 : | FIX(40), FIX(42), FIX(44), FIX(46), | ||
| 71 : | FIX(48), FIX(50), FIX(52), FIX(54), | ||
| 72 : | FIX(56), FIX(58), FIX(60), FIX(62) | ||
| 73 : | }; | ||
| 74 : | edgomez | 1.4 | |
| 75 : | edgomez | 1.9 | /* quantize intra-block |
| 76 : | Isibaar | 1.1 | |
| 77 : | // const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q); | ||
| 78 : | // | ||
| 79 : | // level = DIV_DIV(16 * data[i], default_intra_matrix[i]); | ||
| 80 : | // coeff[i] = (level + quantd) / quant2; | ||
| 81 : | edgomez | 1.9 | */ |
| 82 : | Isibaar | 1.1 | |
| 83 : | edgomez | 1.3 | void |
| 84 : | quant4_intra_c(int16_t * coeff, | ||
| 85 : | const int16_t * data, | ||
| 86 : | const uint32_t quant, | ||
| 87 : | const uint32_t dcscalar) | ||
| 88 : | Isibaar | 1.1 | { |
| 89 : | edgomez | 1.3 | const uint32_t quantd = ((VM18P * quant) + (VM18Q / 2)) / VM18Q; |
| 90 : | const uint32_t mult = multipliers[quant]; | ||
| 91 : | uint32_t i; | ||
| 92 : | Isibaar | 1.2 | int16_t *intra_matrix; |
| 93 : | |||
| 94 : | intra_matrix = get_intra_matrix(); | ||
| 95 : | Isibaar | 1.1 | |
| 96 : | edgomez | 1.9 | coeff[0] = DIV_DIV(data[0], (int32_t) dcscalar); |
| 97 : | Isibaar | 1.1 | |
| 98 : | edgomez | 1.3 | for (i = 1; i < 64; i++) { |
| 99 : | if (data[i] < 0) { | ||
| 100 : | uint32_t level = -data[i]; | ||
| 101 : | |||
| 102 : | level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i]; | ||
| 103 : | level = ((level + quantd) * mult) >> 17; | ||
| 104 : | coeff[i] = -(int16_t) level; | ||
| 105 : | } else if (data[i] > 0) { | ||
| 106 : | uint32_t level = data[i]; | ||
| 107 : | |||
| 108 : | level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i]; | ||
| 109 : | level = ((level + quantd) * mult) >> 17; | ||
| 110 : | edgomez | 1.9 | coeff[i] = level; |
| 111 : | edgomez | 1.3 | } else { |
| 112 : | coeff[i] = 0; | ||
| 113 : | } | ||
| 114 : | } | ||
| 115 : | Isibaar | 1.1 | } |
| 116 : | |||
| 117 : | |||
| 118 : | |||
| 119 : | edgomez | 1.9 | /* dequantize intra-block & clamp to [-2048,2047] |
| 120 : | // data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; | ||
| 121 : | */ | ||
| 122 : | Isibaar | 1.1 | |
| 123 : | edgomez | 1.3 | void |
| 124 : | dequant4_intra_c(int16_t * data, | ||
| 125 : | const int16_t * coeff, | ||
| 126 : | const uint32_t quant, | ||
| 127 : | const uint32_t dcscalar) | ||
| 128 : | Isibaar | 1.1 | { |
| 129 : | edgomez | 1.3 | uint32_t i; |
| 130 : | Isibaar | 1.2 | int16_t *intra_matrix; |
| 131 : | |||
| 132 : | intra_matrix = get_intra_matrix(); | ||
| 133 : | edgomez | 1.3 | |
| 134 : | edgomez | 1.9 | data[0] = coeff[0] * dcscalar; |
| 135 : | edgomez | 1.3 | if (data[0] < -2048) { |
| 136 : | data[0] = -2048; | ||
| 137 : | } else if (data[0] > 2047) { | ||
| 138 : | data[0] = 2047; | ||
| 139 : | } | ||
| 140 : | |||
| 141 : | for (i = 1; i < 64; i++) { | ||
| 142 : | if (coeff[i] == 0) { | ||
| 143 : | data[i] = 0; | ||
| 144 : | } else if (coeff[i] < 0) { | ||
| 145 : | uint32_t level = -coeff[i]; | ||
| 146 : | |||
| 147 : | level = (level * intra_matrix[i] * quant) >> 3; | ||
| 148 : | data[i] = (level <= 2048 ? -(int16_t) level : -2048); | ||
| 149 : | edgomez | 1.9 | } else // if (coeff[i] > 0) |
| 150 : | edgomez | 1.3 | { |
| 151 : | uint32_t level = coeff[i]; | ||
| 152 : | |||
| 153 : | level = (level * intra_matrix[i] * quant) >> 3; | ||
| 154 : | edgomez | 1.9 | data[i] = (level <= 2047 ? level : 2047); |
| 155 : | edgomez | 1.3 | } |
| 156 : | } | ||
| 157 : | Isibaar | 1.1 | } |
| 158 : | |||
| 159 : | |||
| 160 : | |||
| 161 : | edgomez | 1.9 | /* quantize inter-block |
| 162 : | Isibaar | 1.1 | |
| 163 : | // level = DIV_DIV(16 * data[i], default_intra_matrix[i]); | ||
| 164 : | // coeff[i] = (level + quantd) / quant2; | ||
| 165 : | // sum += abs(level); | ||
| 166 : | edgomez | 1.9 | */ |
| 167 : | Isibaar | 1.1 | |
| 168 : | edgomez | 1.3 | uint32_t |
| 169 : | quant4_inter_c(int16_t * coeff, | ||
| 170 : | const int16_t * data, | ||
| 171 : | const uint32_t quant) | ||
| 172 : | Isibaar | 1.1 | { |
| 173 : | edgomez | 1.3 | const uint32_t mult = multipliers[quant]; |
| 174 : | uint32_t sum = 0; | ||
| 175 : | uint32_t i; | ||
| 176 : | Isibaar | 1.2 | int16_t *inter_matrix; |
| 177 : | |||
| 178 : | inter_matrix = get_inter_matrix(); | ||
| 179 : | edgomez | 1.3 | |
| 180 : | for (i = 0; i < 64; i++) { | ||
| 181 : | if (data[i] < 0) { | ||
| 182 : | uint32_t level = -data[i]; | ||
| 183 : | |||
| 184 : | level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; | ||
| 185 : | level = (level * mult) >> 17; | ||
| 186 : | sum += level; | ||
| 187 : | coeff[i] = -(int16_t) level; | ||
| 188 : | } else if (data[i] > 0) { | ||
| 189 : | uint32_t level = data[i]; | ||
| 190 : | |||
| 191 : | level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; | ||
| 192 : | level = (level * mult) >> 17; | ||
| 193 : | sum += level; | ||
| 194 : | edgomez | 1.9 | coeff[i] = level; |
| 195 : | edgomez | 1.3 | } else { |
| 196 : | coeff[i] = 0; | ||
| 197 : | } | ||
| 198 : | } | ||
| 199 : | return sum; | ||
| 200 : | Isibaar | 1.1 | } |
| 201 : | |||
| 202 : | |||
| 203 : | |||
| 204 : | /* dequantize inter-block & clamp to [-2048,2047] | ||
| 205 : | data = ((2 * coeff + SIGN(coeff)) * inter_matrix[i] * quant) / 16 | ||
| 206 : | */ | ||
| 207 : | |||
| 208 : | edgomez | 1.3 | void |
| 209 : | dequant4_inter_c(int16_t * data, | ||
| 210 : | const int16_t * coeff, | ||
| 211 : | const uint32_t quant) | ||
| 212 : | Isibaar | 1.1 | { |
| 213 : | edgomez | 1.3 | uint32_t sum = 0; |
| 214 : | uint32_t i; | ||
| 215 : | Isibaar | 1.2 | int16_t *inter_matrix; |
| 216 : | |||
| 217 : | inter_matrix = get_inter_matrix(); | ||
| 218 : | edgomez | 1.3 | |
| 219 : | for (i = 0; i < 64; i++) { | ||
| 220 : | if (coeff[i] == 0) { | ||
| 221 : | data[i] = 0; | ||
| 222 : | } else if (coeff[i] < 0) { | ||
| 223 : | int32_t level = -coeff[i]; | ||
| 224 : | |||
| 225 : | level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; | ||
| 226 : | data[i] = (level <= 2048 ? -level : -2048); | ||
| 227 : | edgomez | 1.9 | } else // if (coeff[i] > 0) |
| 228 : | edgomez | 1.3 | { |
| 229 : | uint32_t level = coeff[i]; | ||
| 230 : | |||
| 231 : | level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; | ||
| 232 : | edgomez | 1.9 | data[i] = (level <= 2047 ? level : 2047); |
| 233 : | edgomez | 1.3 | } |
| 234 : | |||
| 235 : | sum ^= data[i]; | ||
| 236 : | } | ||
| 237 : | |||
| 238 : | edgomez | 1.9 | // mismatch control |
| 239 : | edgomez | 1.3 | |
| 240 : | if ((sum & 1) == 0) { | ||
| 241 : | data[63] ^= 1; | ||
| 242 : | } | ||
| 243 : | Isibaar | 1.1 | } |
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