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Revision 1.9.2.2 - (view) (download)
| 1 : | edgomez | 1.9.2.2 | /***************************************************************************** |
| 2 : | Isibaar | 1.1 | * |
| 3 : | edgomez | 1.9.2.2 | * XVID MPEG-4 VIDEO CODEC |
| 4 : | * - MPEG4 Quantization related header - | ||
| 5 : | Isibaar | 1.1 | * |
| 6 : | edgomez | 1.9.2.2 | * Copyright(C) 2001-2003 Peter Ross <pross@xvid.org> |
| 7 : | edgomez | 1.6 | * |
| 8 : | edgomez | 1.9.2.2 | * This program is free software ; you can redistribute it and/or modify |
| 9 : | * it under the terms of the GNU General Public License as published by | ||
| 10 : | * the Free Software Foundation ; either version 2 of the License, or | ||
| 11 : | * (at your option) any later version. | ||
| 12 : | * | ||
| 13 : | * This program is distributed in the hope that it will be useful, | ||
| 14 : | * but WITHOUT ANY WARRANTY ; without even the implied warranty of | ||
| 15 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 16 : | * GNU General Public License for more details. | ||
| 17 : | * | ||
| 18 : | * You should have received a copy of the GNU General Public License | ||
| 19 : | * along with this program ; if not, write to the Free Software | ||
| 20 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| 21 : | * | ||
| 22 : | * $Id$ | ||
| 23 : | * | ||
| 24 : | ****************************************************************************/ | ||
| 25 : | Isibaar | 1.1 | |
| 26 : | edgomez | 1.9 | #include "../global.h" |
| 27 : | Isibaar | 1.1 | #include "quant_mpeg4.h" |
| 28 : | Isibaar | 1.2 | #include "quant_matrix.h" |
| 29 : | Isibaar | 1.1 | |
| 30 : | edgomez | 1.9.2.1 | /* function pointers */ |
| 31 : | Isibaar | 1.1 | quant_intraFuncPtr quant4_intra; |
| 32 : | quant_intraFuncPtr dequant4_intra; | ||
| 33 : | dequant_interFuncPtr dequant4_inter; | ||
| 34 : | quant_interFuncPtr quant4_inter; | ||
| 35 : | |||
| 36 : | |||
| 37 : | #define VM18P 3 | ||
| 38 : | #define VM18Q 4 | ||
| 39 : | |||
| 40 : | |||
| 41 : | edgomez | 1.9.2.1 | /* |
| 42 : | * divide-by-multiply table | ||
| 43 : | * need 17 bit shift (16 causes slight errors when q > 19) | ||
| 44 : | */ | ||
| 45 : | Isibaar | 1.1 | |
| 46 : | #define SCALEBITS 17 | ||
| 47 : | #define FIX(X) ((1UL << SCALEBITS) / (X) + 1) | ||
| 48 : | |||
| 49 : | edgomez | 1.3 | static const uint32_t multipliers[32] = { |
| 50 : | 0, FIX(2), FIX(4), FIX(6), | ||
| 51 : | FIX(8), FIX(10), FIX(12), FIX(14), | ||
| 52 : | FIX(16), FIX(18), FIX(20), FIX(22), | ||
| 53 : | FIX(24), FIX(26), FIX(28), FIX(30), | ||
| 54 : | FIX(32), FIX(34), FIX(36), FIX(38), | ||
| 55 : | FIX(40), FIX(42), FIX(44), FIX(46), | ||
| 56 : | FIX(48), FIX(50), FIX(52), FIX(54), | ||
| 57 : | FIX(56), FIX(58), FIX(60), FIX(62) | ||
| 58 : | }; | ||
| 59 : | edgomez | 1.4 | |
| 60 : | edgomez | 1.9.2.1 | /* quantize intra-block |
| 61 : | * | ||
| 62 : | * const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q); | ||
| 63 : | * level = DIV_DIV(16 * data[i], default_intra_matrix[i]); | ||
| 64 : | * coeff[i] = (level + quantd) / quant2; | ||
| 65 : | */ | ||
| 66 : | Isibaar | 1.1 | |
| 67 : | edgomez | 1.3 | void |
| 68 : | quant4_intra_c(int16_t * coeff, | ||
| 69 : | const int16_t * data, | ||
| 70 : | const uint32_t quant, | ||
| 71 : | const uint32_t dcscalar) | ||
| 72 : | Isibaar | 1.1 | { |
| 73 : | edgomez | 1.3 | const uint32_t quantd = ((VM18P * quant) + (VM18Q / 2)) / VM18Q; |
| 74 : | const uint32_t mult = multipliers[quant]; | ||
| 75 : | uint32_t i; | ||
| 76 : | Isibaar | 1.2 | int16_t *intra_matrix; |
| 77 : | |||
| 78 : | intra_matrix = get_intra_matrix(); | ||
| 79 : | Isibaar | 1.1 | |
| 80 : | edgomez | 1.9 | coeff[0] = DIV_DIV(data[0], (int32_t) dcscalar); |
| 81 : | Isibaar | 1.1 | |
| 82 : | edgomez | 1.3 | for (i = 1; i < 64; i++) { |
| 83 : | if (data[i] < 0) { | ||
| 84 : | uint32_t level = -data[i]; | ||
| 85 : | |||
| 86 : | level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i]; | ||
| 87 : | level = ((level + quantd) * mult) >> 17; | ||
| 88 : | coeff[i] = -(int16_t) level; | ||
| 89 : | } else if (data[i] > 0) { | ||
| 90 : | uint32_t level = data[i]; | ||
| 91 : | |||
| 92 : | level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i]; | ||
| 93 : | level = ((level + quantd) * mult) >> 17; | ||
| 94 : | edgomez | 1.9 | coeff[i] = level; |
| 95 : | edgomez | 1.3 | } else { |
| 96 : | coeff[i] = 0; | ||
| 97 : | } | ||
| 98 : | } | ||
| 99 : | Isibaar | 1.1 | } |
| 100 : | |||
| 101 : | |||
| 102 : | |||
| 103 : | edgomez | 1.9.2.1 | /* |
| 104 : | * dequantize intra-block & clamp to [-2048,2047] | ||
| 105 : | * | ||
| 106 : | * data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; | ||
| 107 : | */ | ||
| 108 : | Isibaar | 1.1 | |
| 109 : | edgomez | 1.3 | void |
| 110 : | dequant4_intra_c(int16_t * data, | ||
| 111 : | const int16_t * coeff, | ||
| 112 : | const uint32_t quant, | ||
| 113 : | const uint32_t dcscalar) | ||
| 114 : | Isibaar | 1.1 | { |
| 115 : | edgomez | 1.3 | uint32_t i; |
| 116 : | Isibaar | 1.2 | int16_t *intra_matrix; |
| 117 : | |||
| 118 : | intra_matrix = get_intra_matrix(); | ||
| 119 : | edgomez | 1.3 | |
| 120 : | edgomez | 1.9 | data[0] = coeff[0] * dcscalar; |
| 121 : | edgomez | 1.3 | if (data[0] < -2048) { |
| 122 : | data[0] = -2048; | ||
| 123 : | } else if (data[0] > 2047) { | ||
| 124 : | data[0] = 2047; | ||
| 125 : | } | ||
| 126 : | |||
| 127 : | for (i = 1; i < 64; i++) { | ||
| 128 : | if (coeff[i] == 0) { | ||
| 129 : | data[i] = 0; | ||
| 130 : | } else if (coeff[i] < 0) { | ||
| 131 : | uint32_t level = -coeff[i]; | ||
| 132 : | |||
| 133 : | level = (level * intra_matrix[i] * quant) >> 3; | ||
| 134 : | data[i] = (level <= 2048 ? -(int16_t) level : -2048); | ||
| 135 : | edgomez | 1.9.2.1 | } else /* if (coeff[i] > 0) */ |
| 136 : | edgomez | 1.3 | { |
| 137 : | uint32_t level = coeff[i]; | ||
| 138 : | |||
| 139 : | level = (level * intra_matrix[i] * quant) >> 3; | ||
| 140 : | edgomez | 1.9 | data[i] = (level <= 2047 ? level : 2047); |
| 141 : | edgomez | 1.3 | } |
| 142 : | } | ||
| 143 : | Isibaar | 1.1 | } |
| 144 : | |||
| 145 : | |||
| 146 : | |||
| 147 : | edgomez | 1.9.2.1 | /* quantize inter-block |
| 148 : | * | ||
| 149 : | * level = DIV_DIV(16 * data[i], default_intra_matrix[i]); | ||
| 150 : | * coeff[i] = (level + quantd) / quant2; | ||
| 151 : | * sum += abs(level); | ||
| 152 : | edgomez | 1.9 | */ |
| 153 : | Isibaar | 1.1 | |
| 154 : | edgomez | 1.3 | uint32_t |
| 155 : | quant4_inter_c(int16_t * coeff, | ||
| 156 : | const int16_t * data, | ||
| 157 : | const uint32_t quant) | ||
| 158 : | Isibaar | 1.1 | { |
| 159 : | edgomez | 1.3 | const uint32_t mult = multipliers[quant]; |
| 160 : | uint32_t sum = 0; | ||
| 161 : | uint32_t i; | ||
| 162 : | Isibaar | 1.2 | int16_t *inter_matrix; |
| 163 : | |||
| 164 : | inter_matrix = get_inter_matrix(); | ||
| 165 : | edgomez | 1.3 | |
| 166 : | for (i = 0; i < 64; i++) { | ||
| 167 : | if (data[i] < 0) { | ||
| 168 : | uint32_t level = -data[i]; | ||
| 169 : | |||
| 170 : | level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; | ||
| 171 : | level = (level * mult) >> 17; | ||
| 172 : | sum += level; | ||
| 173 : | coeff[i] = -(int16_t) level; | ||
| 174 : | } else if (data[i] > 0) { | ||
| 175 : | uint32_t level = data[i]; | ||
| 176 : | |||
| 177 : | level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; | ||
| 178 : | level = (level * mult) >> 17; | ||
| 179 : | sum += level; | ||
| 180 : | edgomez | 1.9 | coeff[i] = level; |
| 181 : | edgomez | 1.3 | } else { |
| 182 : | coeff[i] = 0; | ||
| 183 : | } | ||
| 184 : | } | ||
| 185 : | return sum; | ||
| 186 : | Isibaar | 1.1 | } |
| 187 : | |||
| 188 : | |||
| 189 : | |||
| 190 : | /* dequantize inter-block & clamp to [-2048,2047] | ||
| 191 : | data = ((2 * coeff + SIGN(coeff)) * inter_matrix[i] * quant) / 16 | ||
| 192 : | */ | ||
| 193 : | |||
| 194 : | edgomez | 1.3 | void |
| 195 : | dequant4_inter_c(int16_t * data, | ||
| 196 : | const int16_t * coeff, | ||
| 197 : | const uint32_t quant) | ||
| 198 : | Isibaar | 1.1 | { |
| 199 : | edgomez | 1.3 | uint32_t sum = 0; |
| 200 : | uint32_t i; | ||
| 201 : | Isibaar | 1.2 | int16_t *inter_matrix; |
| 202 : | |||
| 203 : | inter_matrix = get_inter_matrix(); | ||
| 204 : | edgomez | 1.3 | |
| 205 : | for (i = 0; i < 64; i++) { | ||
| 206 : | if (coeff[i] == 0) { | ||
| 207 : | data[i] = 0; | ||
| 208 : | } else if (coeff[i] < 0) { | ||
| 209 : | int32_t level = -coeff[i]; | ||
| 210 : | |||
| 211 : | level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; | ||
| 212 : | data[i] = (level <= 2048 ? -level : -2048); | ||
| 213 : | edgomez | 1.9.2.1 | } else /* if (coeff[i] > 0) */ |
| 214 : | edgomez | 1.3 | { |
| 215 : | uint32_t level = coeff[i]; | ||
| 216 : | |||
| 217 : | level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; | ||
| 218 : | edgomez | 1.9 | data[i] = (level <= 2047 ? level : 2047); |
| 219 : | edgomez | 1.3 | } |
| 220 : | |||
| 221 : | sum ^= data[i]; | ||
| 222 : | } | ||
| 223 : | |||
| 224 : | edgomez | 1.9.2.1 | /* mismatch control */ |
| 225 : | edgomez | 1.3 | |
| 226 : | if ((sum & 1) == 0) { | ||
| 227 : | data[63] ^= 1; | ||
| 228 : | } | ||
| 229 : | Isibaar | 1.1 | } |
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