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| 1 : | edgomez | 1.4 | /***************************************************************************** |
| 2 : | Isibaar | 1.1 | * |
| 3 : | edgomez | 1.4 | * XVID MPEG-4 VIDEO CODEC |
| 4 : | * - Mpeg4 quantization/dequantization functions - | ||
| 5 : | Isibaar | 1.1 | * |
| 6 : | suxen_drol | 1.5 | * Copyright(C) 2002 Peter Ross <pross@xvid.org> |
| 7 : | Isibaar | 1.1 | * |
| 8 : | edgomez | 1.6 | * This file is part of XviD, a free MPEG-4 video encoder/decoder |
| 9 : | * | ||
| 10 : | * XviD is free software; you can redistribute it and/or modify it | ||
| 11 : | * under the terms of the GNU General Public License as published by | ||
| 12 : | * the Free Software Foundation; either version 2 of the License, or | ||
| 13 : | edgomez | 1.4 | * (at your option) any later version. |
| 14 : | * | ||
| 15 : | * This program is distributed in the hope that it will be useful, | ||
| 16 : | edgomez | 1.6 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 : | edgomez | 1.4 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 : | * GNU General Public License for more details. | ||
| 19 : | * | ||
| 20 : | * You should have received a copy of the GNU General Public License | ||
| 21 : | edgomez | 1.6 | * along with this program; if not, write to the Free Software |
| 22 : | edgomez | 1.4 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 : | * | ||
| 24 : | edgomez | 1.6 | * Under section 8 of the GNU General Public License, the copyright |
| 25 : | * holders of XVID explicitly forbid distribution in the following | ||
| 26 : | * countries: | ||
| 27 : | * | ||
| 28 : | * - Japan | ||
| 29 : | * - United States of America | ||
| 30 : | * | ||
| 31 : | * Linking XviD statically or dynamically with other modules is making a | ||
| 32 : | * combined work based on XviD. Thus, the terms and conditions of the | ||
| 33 : | * GNU General Public License cover the whole combination. | ||
| 34 : | * | ||
| 35 : | * As a special exception, the copyright holders of XviD give you | ||
| 36 : | * permission to link XviD with independent modules that communicate with | ||
| 37 : | * XviD solely through the VFW1.1 and DShow interfaces, regardless of the | ||
| 38 : | * license terms of these independent modules, and to copy and distribute | ||
| 39 : | * the resulting combined work under terms of your choice, provided that | ||
| 40 : | * every copy of the combined work is accompanied by a complete copy of | ||
| 41 : | * the source code of XviD (the version of XviD used to produce the | ||
| 42 : | * combined work), being distributed under the terms of the GNU General | ||
| 43 : | * Public License plus this exception. An independent module is a module | ||
| 44 : | * which is not derived from or based on XviD. | ||
| 45 : | * | ||
| 46 : | * Note that people who make modified versions of XviD are not obligated | ||
| 47 : | * to grant this special exception for their modified versions; it is | ||
| 48 : | * their choice whether to do so. The GNU General Public License gives | ||
| 49 : | * permission to release a modified version without this exception; this | ||
| 50 : | * exception also makes it possible to release a modified version which | ||
| 51 : | * carries forward this exception. | ||
| 52 : | * | ||
| 53 : | edgomez | 1.8 | * $Id: quant_mpeg4.c,v 1.7 2002/11/26 23:44:11 edgomez Exp $ |
| 54 : | edgomez | 1.4 | * |
| 55 : | ****************************************************************************/ | ||
| 56 : | Isibaar | 1.1 | |
| 57 : | #include "quant_mpeg4.h" | ||
| 58 : | Isibaar | 1.2 | #include "quant_matrix.h" |
| 59 : | Isibaar | 1.1 | |
| 60 : | edgomez | 1.4 | /***************************************************************************** |
| 61 : | * Function pointers | ||
| 62 : | ****************************************************************************/ | ||
| 63 : | |||
| 64 : | Isibaar | 1.1 | quant_intraFuncPtr quant4_intra; |
| 65 : | quant_intraFuncPtr dequant4_intra; | ||
| 66 : | dequant_interFuncPtr dequant4_inter; | ||
| 67 : | quant_interFuncPtr quant4_inter; | ||
| 68 : | |||
| 69 : | |||
| 70 : | edgomez | 1.4 | /***************************************************************************** |
| 71 : | * Local data | ||
| 72 : | ****************************************************************************/ | ||
| 73 : | |||
| 74 : | Isibaar | 1.1 | #define DIV_DIV(A,B) ( (A) > 0 ? ((A)+((B)>>1))/(B) : ((A)-((B)>>1))/(B) ) |
| 75 : | #define SIGN(A) ((A)>0?1:-1) | ||
| 76 : | #define VM18P 3 | ||
| 77 : | #define VM18Q 4 | ||
| 78 : | |||
| 79 : | |||
| 80 : | edgomez | 1.4 | /* |
| 81 : | * divide-by-multiply table | ||
| 82 : | * need 17 bit shift (16 causes slight errors when q > 19) | ||
| 83 : | */ | ||
| 84 : | Isibaar | 1.1 | |
| 85 : | #define SCALEBITS 17 | ||
| 86 : | #define FIX(X) ((1UL << SCALEBITS) / (X) + 1) | ||
| 87 : | |||
| 88 : | edgomez | 1.3 | static const uint32_t multipliers[32] = { |
| 89 : | 0, FIX(2), FIX(4), FIX(6), | ||
| 90 : | FIX(8), FIX(10), FIX(12), FIX(14), | ||
| 91 : | FIX(16), FIX(18), FIX(20), FIX(22), | ||
| 92 : | FIX(24), FIX(26), FIX(28), FIX(30), | ||
| 93 : | FIX(32), FIX(34), FIX(36), FIX(38), | ||
| 94 : | FIX(40), FIX(42), FIX(44), FIX(46), | ||
| 95 : | FIX(48), FIX(50), FIX(52), FIX(54), | ||
| 96 : | FIX(56), FIX(58), FIX(60), FIX(62) | ||
| 97 : | }; | ||
| 98 : | edgomez | 1.4 | |
| 99 : | /***************************************************************************** | ||
| 100 : | * Functions | ||
| 101 : | ****************************************************************************/ | ||
| 102 : | Isibaar | 1.1 | |
| 103 : | edgomez | 1.7 | #if 0 |
| 104 : | /* quantize intra-block */ | ||
| 105 : | Isibaar | 1.1 | |
| 106 : | // const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q); | ||
| 107 : | // | ||
| 108 : | // level = DIV_DIV(16 * data[i], default_intra_matrix[i]); | ||
| 109 : | // coeff[i] = (level + quantd) / quant2; | ||
| 110 : | edgomez | 1.7 | #endif |
| 111 : | Isibaar | 1.1 | |
| 112 : | edgomez | 1.3 | void |
| 113 : | quant4_intra_c(int16_t * coeff, | ||
| 114 : | const int16_t * data, | ||
| 115 : | const uint32_t quant, | ||
| 116 : | const uint32_t dcscalar) | ||
| 117 : | Isibaar | 1.1 | { |
| 118 : | edgomez | 1.3 | const uint32_t quantd = ((VM18P * quant) + (VM18Q / 2)) / VM18Q; |
| 119 : | const uint32_t mult = multipliers[quant]; | ||
| 120 : | uint32_t i; | ||
| 121 : | Isibaar | 1.2 | int16_t *intra_matrix; |
| 122 : | |||
| 123 : | intra_matrix = get_intra_matrix(); | ||
| 124 : | Isibaar | 1.1 | |
| 125 : | edgomez | 1.8 | coeff[0] = (int16_t)(DIV_DIV(data[0], (int32_t) dcscalar)); |
| 126 : | Isibaar | 1.1 | |
| 127 : | edgomez | 1.3 | for (i = 1; i < 64; i++) { |
| 128 : | if (data[i] < 0) { | ||
| 129 : | uint32_t level = -data[i]; | ||
| 130 : | |||
| 131 : | level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i]; | ||
| 132 : | level = ((level + quantd) * mult) >> 17; | ||
| 133 : | coeff[i] = -(int16_t) level; | ||
| 134 : | } else if (data[i] > 0) { | ||
| 135 : | uint32_t level = data[i]; | ||
| 136 : | |||
| 137 : | level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i]; | ||
| 138 : | level = ((level + quantd) * mult) >> 17; | ||
| 139 : | edgomez | 1.8 | coeff[i] = (int16_t)level; |
| 140 : | edgomez | 1.3 | } else { |
| 141 : | coeff[i] = 0; | ||
| 142 : | } | ||
| 143 : | } | ||
| 144 : | Isibaar | 1.1 | } |
| 145 : | |||
| 146 : | |||
| 147 : | |||
| 148 : | edgomez | 1.7 | /* dequantize intra-block & clamp to [-2048,2047] */ |
| 149 : | /* data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; */ | ||
| 150 : | |||
| 151 : | Isibaar | 1.1 | |
| 152 : | edgomez | 1.3 | void |
| 153 : | dequant4_intra_c(int16_t * data, | ||
| 154 : | const int16_t * coeff, | ||
| 155 : | const uint32_t quant, | ||
| 156 : | const uint32_t dcscalar) | ||
| 157 : | Isibaar | 1.1 | { |
| 158 : | edgomez | 1.3 | uint32_t i; |
| 159 : | Isibaar | 1.2 | int16_t *intra_matrix; |
| 160 : | |||
| 161 : | intra_matrix = get_intra_matrix(); | ||
| 162 : | edgomez | 1.3 | |
| 163 : | edgomez | 1.8 | data[0] = (int16_t)(coeff[0] * dcscalar); |
| 164 : | edgomez | 1.3 | if (data[0] < -2048) { |
| 165 : | data[0] = -2048; | ||
| 166 : | } else if (data[0] > 2047) { | ||
| 167 : | data[0] = 2047; | ||
| 168 : | } | ||
| 169 : | |||
| 170 : | for (i = 1; i < 64; i++) { | ||
| 171 : | if (coeff[i] == 0) { | ||
| 172 : | data[i] = 0; | ||
| 173 : | } else if (coeff[i] < 0) { | ||
| 174 : | uint32_t level = -coeff[i]; | ||
| 175 : | |||
| 176 : | level = (level * intra_matrix[i] * quant) >> 3; | ||
| 177 : | data[i] = (level <= 2048 ? -(int16_t) level : -2048); | ||
| 178 : | edgomez | 1.7 | } else /* if (coeff[i] > 0) */ |
| 179 : | edgomez | 1.3 | { |
| 180 : | uint32_t level = coeff[i]; | ||
| 181 : | |||
| 182 : | level = (level * intra_matrix[i] * quant) >> 3; | ||
| 183 : | edgomez | 1.8 | data[i] = (int16_t)(level <= 2047 ? level : 2047); |
| 184 : | edgomez | 1.3 | } |
| 185 : | } | ||
| 186 : | Isibaar | 1.1 | } |
| 187 : | |||
| 188 : | |||
| 189 : | |||
| 190 : | edgomez | 1.7 | #if 0 |
| 191 : | /* quantize inter-block */ | ||
| 192 : | Isibaar | 1.1 | |
| 193 : | // level = DIV_DIV(16 * data[i], default_intra_matrix[i]); | ||
| 194 : | // coeff[i] = (level + quantd) / quant2; | ||
| 195 : | // sum += abs(level); | ||
| 196 : | edgomez | 1.7 | #endif |
| 197 : | Isibaar | 1.1 | |
| 198 : | edgomez | 1.3 | uint32_t |
| 199 : | quant4_inter_c(int16_t * coeff, | ||
| 200 : | const int16_t * data, | ||
| 201 : | const uint32_t quant) | ||
| 202 : | Isibaar | 1.1 | { |
| 203 : | edgomez | 1.3 | const uint32_t mult = multipliers[quant]; |
| 204 : | uint32_t sum = 0; | ||
| 205 : | uint32_t i; | ||
| 206 : | Isibaar | 1.2 | int16_t *inter_matrix; |
| 207 : | |||
| 208 : | inter_matrix = get_inter_matrix(); | ||
| 209 : | edgomez | 1.3 | |
| 210 : | for (i = 0; i < 64; i++) { | ||
| 211 : | if (data[i] < 0) { | ||
| 212 : | uint32_t level = -data[i]; | ||
| 213 : | |||
| 214 : | level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; | ||
| 215 : | level = (level * mult) >> 17; | ||
| 216 : | sum += level; | ||
| 217 : | coeff[i] = -(int16_t) level; | ||
| 218 : | } else if (data[i] > 0) { | ||
| 219 : | uint32_t level = data[i]; | ||
| 220 : | |||
| 221 : | level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; | ||
| 222 : | level = (level * mult) >> 17; | ||
| 223 : | sum += level; | ||
| 224 : | edgomez | 1.8 | coeff[i] = (int16_t)level; |
| 225 : | edgomez | 1.3 | } else { |
| 226 : | coeff[i] = 0; | ||
| 227 : | } | ||
| 228 : | } | ||
| 229 : | return sum; | ||
| 230 : | Isibaar | 1.1 | } |
| 231 : | |||
| 232 : | |||
| 233 : | |||
| 234 : | /* dequantize inter-block & clamp to [-2048,2047] | ||
| 235 : | data = ((2 * coeff + SIGN(coeff)) * inter_matrix[i] * quant) / 16 | ||
| 236 : | */ | ||
| 237 : | |||
| 238 : | edgomez | 1.3 | void |
| 239 : | dequant4_inter_c(int16_t * data, | ||
| 240 : | const int16_t * coeff, | ||
| 241 : | const uint32_t quant) | ||
| 242 : | Isibaar | 1.1 | { |
| 243 : | edgomez | 1.3 | uint32_t sum = 0; |
| 244 : | uint32_t i; | ||
| 245 : | Isibaar | 1.2 | int16_t *inter_matrix; |
| 246 : | |||
| 247 : | inter_matrix = get_inter_matrix(); | ||
| 248 : | edgomez | 1.3 | |
| 249 : | for (i = 0; i < 64; i++) { | ||
| 250 : | if (coeff[i] == 0) { | ||
| 251 : | data[i] = 0; | ||
| 252 : | } else if (coeff[i] < 0) { | ||
| 253 : | int32_t level = -coeff[i]; | ||
| 254 : | |||
| 255 : | level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; | ||
| 256 : | data[i] = (level <= 2048 ? -level : -2048); | ||
| 257 : | edgomez | 1.7 | } else /* if (coeff[i] > 0) */ |
| 258 : | edgomez | 1.3 | { |
| 259 : | uint32_t level = coeff[i]; | ||
| 260 : | |||
| 261 : | level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; | ||
| 262 : | edgomez | 1.8 | data[i] = (int16_t)(level <= 2047 ? level : 2047); |
| 263 : | edgomez | 1.3 | } |
| 264 : | |||
| 265 : | sum ^= data[i]; | ||
| 266 : | } | ||
| 267 : | |||
| 268 : | edgomez | 1.7 | /* mismatch control */ |
| 269 : | edgomez | 1.3 | |
| 270 : | if ((sum & 1) == 0) { | ||
| 271 : | data[63] ^= 1; | ||
| 272 : | } | ||
| 273 : | Isibaar | 1.1 | } |
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