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Revision 1.5 - (view) (download)
| 1 : | edgomez | 1.2 | /***************************************************************************** |
| 2 : | * | ||
| 3 : | * XVID MPEG-4 VIDEO CODEC | ||
| 4 : | * - MPEG4 Quantization related header - | ||
| 5 : | * | ||
| 6 : | * Copyright(C) 2001-2003 Peter Ross <pross@xvid.org> | ||
| 7 : | * | ||
| 8 : | * 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 : | Isibaar | 1.5 | * $Id: quant_mpeg.c,v 1.4 2008/11/26 01:04:34 Isibaar Exp $ |
| 23 : | edgomez | 1.2 | * |
| 24 : | ****************************************************************************/ | ||
| 25 : | |||
| 26 : | #include "../global.h" | ||
| 27 : | #include "quant.h" | ||
| 28 : | #include "quant_matrix.h" | ||
| 29 : | |||
| 30 : | /***************************************************************************** | ||
| 31 : | * Global function pointers | ||
| 32 : | ****************************************************************************/ | ||
| 33 : | |||
| 34 : | /* Quant */ | ||
| 35 : | quant_intraFuncPtr quant_mpeg_intra; | ||
| 36 : | quant_interFuncPtr quant_mpeg_inter; | ||
| 37 : | |||
| 38 : | /* DeQuant */ | ||
| 39 : | quant_intraFuncPtr dequant_mpeg_intra; | ||
| 40 : | quant_interFuncPtr dequant_mpeg_inter; | ||
| 41 : | |||
| 42 : | /***************************************************************************** | ||
| 43 : | * Local data | ||
| 44 : | ****************************************************************************/ | ||
| 45 : | |||
| 46 : | /* divide-by-multiply table | ||
| 47 : | * needs 17 bit shift (16 causes slight errors when q > 19) */ | ||
| 48 : | |||
| 49 : | #define FIX(X) ((1UL << SCALEBITS) / (X) + 1) | ||
| 50 : | |||
| 51 : | 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 : | 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 : | |||
| 63 : | /***************************************************************************** | ||
| 64 : | * Function definitions | ||
| 65 : | ****************************************************************************/ | ||
| 66 : | |||
| 67 : | /* quantize intra-block | ||
| 68 : | */ | ||
| 69 : | |||
| 70 : | uint32_t | ||
| 71 : | quant_mpeg_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 : | { | ||
| 77 : | syskin | 1.3 | const uint16_t * intra_matrix_rec = mpeg_quant_matrices + 1*64; |
| 78 : | edgomez | 1.2 | int i; |
| 79 : | syskin | 1.3 | int rounding = 1<<(SCALEBITS-1-3); |
| 80 : | edgomez | 1.2 | |
| 81 : | coeff[0] = DIV_DIV(data[0], (int32_t) dcscalar); | ||
| 82 : | Isibaar | 1.4 | |
| 83 : | Isibaar | 1.5 | for (i = 1; i < 64; i++) { |
| 84 : | Isibaar | 1.4 | int32_t level = data[i]; |
| 85 : | syskin | 1.3 | level *= intra_matrix_rec[i]; |
| 86 : | level = (level + rounding)>>(SCALEBITS-3); | ||
| 87 : | coeff[i] = level; | ||
| 88 : | edgomez | 1.2 | } |
| 89 : | |||
| 90 : | return(0); | ||
| 91 : | } | ||
| 92 : | |||
| 93 : | /* quantize inter-block | ||
| 94 : | * | ||
| 95 : | * level = DIV_DIV(16 * data[i], default_intra_matrix[i]); | ||
| 96 : | * coeff[i] = (level + quantd) / quant2; | ||
| 97 : | * sum += abs(level); | ||
| 98 : | */ | ||
| 99 : | |||
| 100 : | uint32_t | ||
| 101 : | quant_mpeg_inter_c(int16_t * coeff, | ||
| 102 : | const int16_t * data, | ||
| 103 : | const uint32_t quant, | ||
| 104 : | const uint16_t * mpeg_quant_matrices) | ||
| 105 : | { | ||
| 106 : | const uint32_t mult = multipliers[quant]; | ||
| 107 : | const uint16_t *inter_matrix = get_inter_matrix(mpeg_quant_matrices); | ||
| 108 : | uint32_t sum = 0; | ||
| 109 : | int i; | ||
| 110 : | |||
| 111 : | for (i = 0; i < 64; i++) { | ||
| 112 : | if (data[i] < 0) { | ||
| 113 : | uint32_t level = -data[i]; | ||
| 114 : | |||
| 115 : | level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; | ||
| 116 : | level = (level * mult) >> 17; | ||
| 117 : | sum += level; | ||
| 118 : | coeff[i] = -(int16_t) level; | ||
| 119 : | } else if (data[i] > 0) { | ||
| 120 : | uint32_t level = data[i]; | ||
| 121 : | |||
| 122 : | level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; | ||
| 123 : | level = (level * mult) >> 17; | ||
| 124 : | sum += level; | ||
| 125 : | coeff[i] = level; | ||
| 126 : | } else { | ||
| 127 : | coeff[i] = 0; | ||
| 128 : | } | ||
| 129 : | } | ||
| 130 : | |||
| 131 : | return(sum); | ||
| 132 : | } | ||
| 133 : | |||
| 134 : | /* dequantize intra-block & clamp to [-2048,2047] | ||
| 135 : | * | ||
| 136 : | * data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; | ||
| 137 : | */ | ||
| 138 : | |||
| 139 : | uint32_t | ||
| 140 : | dequant_mpeg_intra_c(int16_t * data, | ||
| 141 : | const int16_t * coeff, | ||
| 142 : | const uint32_t quant, | ||
| 143 : | const uint32_t dcscalar, | ||
| 144 : | const uint16_t * mpeg_quant_matrices) | ||
| 145 : | { | ||
| 146 : | const uint16_t *intra_matrix = get_intra_matrix(mpeg_quant_matrices); | ||
| 147 : | int i; | ||
| 148 : | |||
| 149 : | data[0] = coeff[0] * dcscalar; | ||
| 150 : | if (data[0] < -2048) { | ||
| 151 : | data[0] = -2048; | ||
| 152 : | } else if (data[0] > 2047) { | ||
| 153 : | data[0] = 2047; | ||
| 154 : | } | ||
| 155 : | |||
| 156 : | for (i = 1; i < 64; i++) { | ||
| 157 : | if (coeff[i] == 0) { | ||
| 158 : | data[i] = 0; | ||
| 159 : | } else if (coeff[i] < 0) { | ||
| 160 : | uint32_t level = -coeff[i]; | ||
| 161 : | |||
| 162 : | level = (level * intra_matrix[i] * quant) >> 3; | ||
| 163 : | data[i] = (level <= 2048 ? -(int16_t) level : -2048); | ||
| 164 : | } else { | ||
| 165 : | uint32_t level = coeff[i]; | ||
| 166 : | |||
| 167 : | level = (level * intra_matrix[i] * quant) >> 3; | ||
| 168 : | data[i] = (level <= 2047 ? level : 2047); | ||
| 169 : | } | ||
| 170 : | } | ||
| 171 : | |||
| 172 : | return(0); | ||
| 173 : | } | ||
| 174 : | |||
| 175 : | |||
| 176 : | /* dequantize inter-block & clamp to [-2048,2047] | ||
| 177 : | * data = ((2 * coeff + SIGN(coeff)) * inter_matrix[i] * quant) / 16 | ||
| 178 : | */ | ||
| 179 : | |||
| 180 : | uint32_t | ||
| 181 : | dequant_mpeg_inter_c(int16_t * data, | ||
| 182 : | const int16_t * coeff, | ||
| 183 : | const uint32_t quant, | ||
| 184 : | const uint16_t * mpeg_quant_matrices) | ||
| 185 : | { | ||
| 186 : | uint32_t sum = 0; | ||
| 187 : | const uint16_t *inter_matrix = get_inter_matrix(mpeg_quant_matrices); | ||
| 188 : | int i; | ||
| 189 : | |||
| 190 : | for (i = 0; i < 64; i++) { | ||
| 191 : | if (coeff[i] == 0) { | ||
| 192 : | data[i] = 0; | ||
| 193 : | } else if (coeff[i] < 0) { | ||
| 194 : | int32_t level = -coeff[i]; | ||
| 195 : | |||
| 196 : | level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; | ||
| 197 : | data[i] = (level <= 2048 ? -level : -2048); | ||
| 198 : | } else { | ||
| 199 : | uint32_t level = coeff[i]; | ||
| 200 : | |||
| 201 : | level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; | ||
| 202 : | data[i] = (level <= 2047 ? level : 2047); | ||
| 203 : | } | ||
| 204 : | |||
| 205 : | sum ^= data[i]; | ||
| 206 : | } | ||
| 207 : | |||
| 208 : | /* mismatch control */ | ||
| 209 : | if ((sum & 1) == 0) { | ||
| 210 : | data[63] ^= 1; | ||
| 211 : | } | ||
| 212 : | |||
| 213 : | return(0); | ||
| 214 : | } |
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