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| 1 : | edgomez | 1382 | /***************************************************************************** |
| 2 : | Isibaar | 3 | * |
| 3 : | edgomez | 1382 | * XVID MPEG-4 VIDEO CODEC |
| 4 : | * - MPEG4 Quantization H263 implementation - | ||
| 5 : | Isibaar | 3 | * |
| 6 : | edgomez | 1382 | * Copyright(C) 2001-2003 Peter Ross <pross@xvid.org> |
| 7 : | Isibaar | 3 | * |
| 8 : | edgomez | 1382 | * 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 : | Isibaar | 3 | * |
| 13 : | edgomez | 1382 | * 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 : | Isibaar | 3 | * |
| 18 : | edgomez | 1382 | * 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 : | Isibaar | 3 | * |
| 22 : | Isibaar | 1988 | * $Id$ |
| 23 : | Isibaar | 3 | * |
| 24 : | edgomez | 1382 | ****************************************************************************/ |
| 25 : | Isibaar | 3 | |
| 26 : | edgomez | 851 | #include "../global.h" |
| 27 : | edgomez | 1382 | #include "quant.h" |
| 28 : | Isibaar | 3 | |
| 29 : | edgomez | 1382 | /***************************************************************************** |
| 30 : | * Global function pointers | ||
| 31 : | ****************************************************************************/ | ||
| 32 : | Isibaar | 3 | |
| 33 : | edgomez | 1382 | /* Quant */ |
| 34 : | quant_intraFuncPtr quant_h263_intra; | ||
| 35 : | quant_interFuncPtr quant_h263_inter; | ||
| 36 : | |||
| 37 : | /* DeQuant */ | ||
| 38 : | quant_intraFuncPtr dequant_h263_intra; | ||
| 39 : | quant_interFuncPtr dequant_h263_inter; | ||
| 40 : | |||
| 41 : | /***************************************************************************** | ||
| 42 : | * Local data | ||
| 43 : | ****************************************************************************/ | ||
| 44 : | |||
| 45 : | /* divide-by-multiply table | ||
| 46 : | * a 16 bit shiting is enough in this case */ | ||
| 47 : | |||
| 48 : | Isibaar | 3 | #define SCALEBITS 16 |
| 49 : | #define FIX(X) ((1L << SCALEBITS) / (X) + 1) | ||
| 50 : | |||
| 51 : | edgomez | 1382 | static const uint32_t multipliers[32] = |
| 52 : | { | ||
| 53 : | 0, FIX(2), FIX(4), FIX(6), | ||
| 54 : | FIX(8), FIX(10), FIX(12), FIX(14), | ||
| 55 : | edgomez | 195 | FIX(16), FIX(18), FIX(20), FIX(22), |
| 56 : | FIX(24), FIX(26), FIX(28), FIX(30), | ||
| 57 : | FIX(32), FIX(34), FIX(36), FIX(38), | ||
| 58 : | FIX(40), FIX(42), FIX(44), FIX(46), | ||
| 59 : | FIX(48), FIX(50), FIX(52), FIX(54), | ||
| 60 : | FIX(56), FIX(58), FIX(60), FIX(62) | ||
| 61 : | }; | ||
| 62 : | Isibaar | 3 | |
| 63 : | edgomez | 1382 | /***************************************************************************** |
| 64 : | * Function definitions | ||
| 65 : | ****************************************************************************/ | ||
| 66 : | Isibaar | 3 | |
| 67 : | /* quantize intra-block | ||
| 68 : | edgomez | 1382 | */ |
| 69 : | Isibaar | 3 | |
| 70 : | edgomez | 1382 | uint32_t |
| 71 : | quant_h263_intra_c(int16_t * coeff, | ||
| 72 : | const int16_t * data, | ||
| 73 : | const uint32_t quant, | ||
| 74 : | const uint32_t dcscalar, | ||
| 75 : | const uint16_t * mpeg_quant_matrices) | ||
| 76 : | Isibaar | 3 | { |
| 77 : | const uint32_t mult = multipliers[quant]; | ||
| 78 : | edgomez | 851 | const uint16_t quant_m_2 = quant << 1; |
| 79 : | edgomez | 1382 | int i; |
| 80 : | Isibaar | 3 | |
| 81 : | edgomez | 851 | coeff[0] = DIV_DIV(data[0], (int32_t) dcscalar); |
| 82 : | Isibaar | 3 | |
| 83 : | for (i = 1; i < 64; i++) { | ||
| 84 : | int16_t acLevel = data[i]; | ||
| 85 : | |||
| 86 : | if (acLevel < 0) { | ||
| 87 : | acLevel = -acLevel; | ||
| 88 : | if (acLevel < quant_m_2) { | ||
| 89 : | coeff[i] = 0; | ||
| 90 : | continue; | ||
| 91 : | } | ||
| 92 : | edgomez | 851 | acLevel = (acLevel * mult) >> SCALEBITS; |
| 93 : | Isibaar | 3 | coeff[i] = -acLevel; |
| 94 : | } else { | ||
| 95 : | if (acLevel < quant_m_2) { | ||
| 96 : | coeff[i] = 0; | ||
| 97 : | continue; | ||
| 98 : | } | ||
| 99 : | edgomez | 851 | acLevel = (acLevel * mult) >> SCALEBITS; |
| 100 : | Isibaar | 3 | coeff[i] = acLevel; |
| 101 : | } | ||
| 102 : | } | ||
| 103 : | edgomez | 1382 | |
| 104 : | return(0); | ||
| 105 : | Isibaar | 3 | } |
| 106 : | |||
| 107 : | |||
| 108 : | /* quantize inter-block | ||
| 109 : | edgomez | 1382 | */ |
| 110 : | Isibaar | 3 | |
| 111 : | edgomez | 195 | uint32_t |
| 112 : | edgomez | 1382 | quant_h263_inter_c(int16_t * coeff, |
| 113 : | const int16_t * data, | ||
| 114 : | const uint32_t quant, | ||
| 115 : | const uint16_t * mpeg_quant_matrices) | ||
| 116 : | Isibaar | 3 | { |
| 117 : | const uint32_t mult = multipliers[quant]; | ||
| 118 : | edgomez | 851 | const uint16_t quant_m_2 = quant << 1; |
| 119 : | const uint16_t quant_d_2 = quant >> 1; | ||
| 120 : | edgomez | 1382 | uint32_t sum = 0; |
| 121 : | Isibaar | 3 | uint32_t i; |
| 122 : | |||
| 123 : | for (i = 0; i < 64; i++) { | ||
| 124 : | int16_t acLevel = data[i]; | ||
| 125 : | edgomez | 195 | |
| 126 : | Isibaar | 3 | if (acLevel < 0) { |
| 127 : | acLevel = (-acLevel) - quant_d_2; | ||
| 128 : | if (acLevel < quant_m_2) { | ||
| 129 : | coeff[i] = 0; | ||
| 130 : | continue; | ||
| 131 : | } | ||
| 132 : | |||
| 133 : | edgomez | 851 | acLevel = (acLevel * mult) >> SCALEBITS; |
| 134 : | edgomez | 1382 | sum += acLevel; /* sum += |acLevel| */ |
| 135 : | Isibaar | 3 | coeff[i] = -acLevel; |
| 136 : | } else { | ||
| 137 : | acLevel -= quant_d_2; | ||
| 138 : | if (acLevel < quant_m_2) { | ||
| 139 : | coeff[i] = 0; | ||
| 140 : | continue; | ||
| 141 : | } | ||
| 142 : | edgomez | 851 | acLevel = (acLevel * mult) >> SCALEBITS; |
| 143 : | Isibaar | 3 | sum += acLevel; |
| 144 : | coeff[i] = acLevel; | ||
| 145 : | } | ||
| 146 : | } | ||
| 147 : | |||
| 148 : | edgomez | 1382 | return(sum); |
| 149 : | Isibaar | 3 | } |
| 150 : | |||
| 151 : | |||
| 152 : | /* dequantize intra-block & clamp to [-2048,2047] | ||
| 153 : | edgomez | 1382 | */ |
| 154 : | Isibaar | 3 | |
| 155 : | edgomez | 1382 | uint32_t |
| 156 : | dequant_h263_intra_c(int16_t * data, | ||
| 157 : | const int16_t * coeff, | ||
| 158 : | const uint32_t quant, | ||
| 159 : | const uint32_t dcscalar, | ||
| 160 : | const uint16_t * mpeg_quant_matrices) | ||
| 161 : | Isibaar | 3 | { |
| 162 : | const int32_t quant_m_2 = quant << 1; | ||
| 163 : | const int32_t quant_add = (quant & 1 ? quant : quant - 1); | ||
| 164 : | edgomez | 1382 | int i; |
| 165 : | Isibaar | 3 | |
| 166 : | edgomez | 851 | data[0] = coeff[0] * dcscalar; |
| 167 : | edgomez | 195 | if (data[0] < -2048) { |
| 168 : | Isibaar | 3 | data[0] = -2048; |
| 169 : | edgomez | 195 | } else if (data[0] > 2047) { |
| 170 : | Isibaar | 3 | data[0] = 2047; |
| 171 : | } | ||
| 172 : | |||
| 173 : | for (i = 1; i < 64; i++) { | ||
| 174 : | int32_t acLevel = coeff[i]; | ||
| 175 : | edgomez | 195 | |
| 176 : | if (acLevel == 0) { | ||
| 177 : | Isibaar | 3 | data[i] = 0; |
| 178 : | edgomez | 195 | } else if (acLevel < 0) { |
| 179 : | Isibaar | 3 | acLevel = quant_m_2 * -acLevel + quant_add; |
| 180 : | data[i] = (acLevel <= 2048 ? -acLevel : -2048); | ||
| 181 : | edgomez | 1382 | } else { |
| 182 : | Isibaar | 3 | acLevel = quant_m_2 * acLevel + quant_add; |
| 183 : | data[i] = (acLevel <= 2047 ? acLevel : 2047); | ||
| 184 : | } | ||
| 185 : | } | ||
| 186 : | edgomez | 1382 | |
| 187 : | return(0); | ||
| 188 : | Isibaar | 3 | } |
| 189 : | |||
| 190 : | |||
| 191 : | |||
| 192 : | /* dequantize inter-block & clamp to [-2048,2047] | ||
| 193 : | edgomez | 1382 | */ |
| 194 : | Isibaar | 3 | |
| 195 : | edgomez | 1382 | uint32_t |
| 196 : | dequant_h263_inter_c(int16_t * data, | ||
| 197 : | const int16_t * coeff, | ||
| 198 : | const uint32_t quant, | ||
| 199 : | const uint16_t * mpeg_quant_matrices) | ||
| 200 : | Isibaar | 3 | { |
| 201 : | edgomez | 851 | const uint16_t quant_m_2 = quant << 1; |
| 202 : | const uint16_t quant_add = (quant & 1 ? quant : quant - 1); | ||
| 203 : | edgomez | 1382 | int i; |
| 204 : | Isibaar | 3 | |
| 205 : | for (i = 0; i < 64; i++) { | ||
| 206 : | int16_t acLevel = coeff[i]; | ||
| 207 : | edgomez | 195 | |
| 208 : | if (acLevel == 0) { | ||
| 209 : | Isibaar | 3 | data[i] = 0; |
| 210 : | edgomez | 195 | } else if (acLevel < 0) { |
| 211 : | Isibaar | 3 | acLevel = acLevel * quant_m_2 - quant_add; |
| 212 : | data[i] = (acLevel >= -2048 ? acLevel : -2048); | ||
| 213 : | edgomez | 1382 | } else { |
| 214 : | Isibaar | 3 | acLevel = acLevel * quant_m_2 + quant_add; |
| 215 : | data[i] = (acLevel <= 2047 ? acLevel : 2047); | ||
| 216 : | } | ||
| 217 : | } | ||
| 218 : | edgomez | 1382 | |
| 219 : | return(0); | ||
| 220 : | Isibaar | 3 | } |
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