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Revision 1.11 - (view) (download)
| 1 : | edgomez | 1.7 | /***************************************************************************** |
| 2 : | * | ||
| 3 : | * XVID MPEG-4 VIDEO CODEC | ||
| 4 : | * - Adaptive quantization functions - | ||
| 5 : | * | ||
| 6 : | suxen_drol | 1.10 | * Copyright(C) 2002 Peter Ross <pross@xvid.org> |
| 7 : | edgomez | 1.11 | * 2002 Christoph Lampert <gruel@web.de> |
| 8 : | edgomez | 1.7 | * |
| 9 : | * This program is an implementation of a part of one or more MPEG-4 | ||
| 10 : | * Video tools as specified in ISO/IEC 14496-2 standard. Those intending | ||
| 11 : | * to use this software module in hardware or software products are | ||
| 12 : | * advised that its use may infringe existing patents or copyrights, and | ||
| 13 : | * any such use would be at such party's own risk. The original | ||
| 14 : | * developer of this software module and his/her company, and subsequent | ||
| 15 : | * editors and their companies, will have no liability for use of this | ||
| 16 : | * software or modifications or derivatives thereof. | ||
| 17 : | * | ||
| 18 : | * This program is free software ; you can redistribute it and/or modify | ||
| 19 : | * it under the terms of the GNU General Public License as published by | ||
| 20 : | * the Free Software Foundation ; either version 2 of the License, or | ||
| 21 : | * (at your option) any later version. | ||
| 22 : | * | ||
| 23 : | * This program is distributed in the hope that it will be useful, | ||
| 24 : | * but WITHOUT ANY WARRANTY ; without even the implied warranty of | ||
| 25 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 26 : | * GNU General Public License for more details. | ||
| 27 : | * | ||
| 28 : | * You should have received a copy of the GNU General Public License | ||
| 29 : | * along with this program ; if not, write to the Free Software | ||
| 30 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| 31 : | * | ||
| 32 : | edgomez | 1.11 | * $Id: adapt_quant.c,v 1.10 2002/09/21 03:07:56 suxen_drol Exp $ |
| 33 : | edgomez | 1.7 | * |
| 34 : | ****************************************************************************/ | ||
| 35 : | |||
| 36 : | Isibaar | 1.1 | #include "../portab.h" |
| 37 : | #include "adapt_quant.h" | ||
| 38 : | |||
| 39 : | edgomez | 1.3 | #include <stdlib.h> /* free, malloc */ |
| 40 : | edgomez | 1.2 | |
| 41 : | Isibaar | 1.1 | #define MAX(a,b) (((a) > (b)) ? (a) : (b)) |
| 42 : | #define RDIFF(a,b) ((int)(a+0.5)-(int)(b+0.5)) | ||
| 43 : | edgomez | 1.7 | |
| 44 : | /***************************************************************************** | ||
| 45 : | * Functions | ||
| 46 : | ****************************************************************************/ | ||
| 47 : | Isibaar | 1.1 | |
| 48 : | edgomez | 1.3 | int |
| 49 : | normalize_quantizer_field(float *in, | ||
| 50 : | int *out, | ||
| 51 : | int num, | ||
| 52 : | int min_quant, | ||
| 53 : | int max_quant) | ||
| 54 : | Isibaar | 1.1 | { |
| 55 : | int i; | ||
| 56 : | int finished; | ||
| 57 : | edgomez | 1.3 | |
| 58 : | do { | ||
| 59 : | Isibaar | 1.1 | finished = 1; |
| 60 : | edgomez | 1.3 | for (i = 1; i < num; i++) { |
| 61 : | if (RDIFF(in[i], in[i - 1]) > 2) { | ||
| 62 : | Isibaar | 1.1 | in[i] -= (float) 0.5; |
| 63 : | finished = 0; | ||
| 64 : | edgomez | 1.3 | } else if (RDIFF(in[i], in[i - 1]) < -2) { |
| 65 : | in[i - 1] -= (float) 0.5; | ||
| 66 : | Isibaar | 1.1 | finished = 0; |
| 67 : | } | ||
| 68 : | edgomez | 1.3 | |
| 69 : | if (in[i] > max_quant) { | ||
| 70 : | edgomez | 1.2 | in[i] = (float) max_quant; |
| 71 : | finished = 0; | ||
| 72 : | } | ||
| 73 : | edgomez | 1.3 | if (in[i] < min_quant) { |
| 74 : | edgomez | 1.2 | in[i] = (float) min_quant; |
| 75 : | finished = 0; | ||
| 76 : | } | ||
| 77 : | edgomez | 1.3 | if (in[i - 1] > max_quant) { |
| 78 : | in[i - 1] = (float) max_quant; | ||
| 79 : | edgomez | 1.2 | finished = 0; |
| 80 : | } | ||
| 81 : | edgomez | 1.3 | if (in[i - 1] < min_quant) { |
| 82 : | in[i - 1] = (float) min_quant; | ||
| 83 : | edgomez | 1.2 | finished = 0; |
| 84 : | } | ||
| 85 : | Isibaar | 1.1 | } |
| 86 : | edgomez | 1.3 | } while (!finished); |
| 87 : | |||
| 88 : | Isibaar | 1.1 | out[0] = 0; |
| 89 : | for (i = 1; i < num; i++) | ||
| 90 : | edgomez | 1.3 | out[i] = RDIFF(in[i], in[i - 1]); |
| 91 : | |||
| 92 : | Isibaar | 1.1 | return (int) (in[0] + 0.5); |
| 93 : | } | ||
| 94 : | |||
| 95 : | edgomez | 1.3 | int |
| 96 : | adaptive_quantization(unsigned char *buf, | ||
| 97 : | int stride, | ||
| 98 : | int *intquant, | ||
| 99 : | int framequant, | ||
| 100 : | int min_quant, | ||
| 101 : | int max_quant, | ||
| 102 : | int mb_width, | ||
| 103 : | int mb_height) // no qstride because normalization | ||
| 104 : | Isibaar | 1.1 | { |
| 105 : | edgomez | 1.3 | int i, j, k, l; |
| 106 : | |||
| 107 : | edgomez | 1.6 | float *quant; |
| 108 : | Isibaar | 1.1 | unsigned char *ptr; |
| 109 : | float *val; | ||
| 110 : | Isibaar | 1.5 | float global = 0.; |
| 111 : | uint32_t mid_range = 0; | ||
| 112 : | |||
| 113 : | const float DarkAmpl = 14 / 2; | ||
| 114 : | const float BrightAmpl = 10 / 2; | ||
| 115 : | const float DarkThres = 70; | ||
| 116 : | const float BrightThres = 200; | ||
| 117 : | |||
| 118 : | const float GlobalDarkThres = 60; | ||
| 119 : | const float GlobalBrightThres = 170; | ||
| 120 : | |||
| 121 : | const float MidRangeThres = 20; | ||
| 122 : | const float UpperLimit = 200; | ||
| 123 : | const float LowerLimit = 25; | ||
| 124 : | Isibaar | 1.1 | |
| 125 : | edgomez | 1.3 | |
| 126 : | edgomez | 1.6 | if (!(quant = (float *) malloc(mb_width * mb_height * sizeof(float)))) |
| 127 : | return(-1); | ||
| 128 : | Isibaar | 1.1 | |
| 129 : | edgomez | 1.9 | if(!(val = (float *) malloc(mb_width * mb_height * sizeof(float)))) { |
| 130 : | free(quant); | ||
| 131 : | edgomez | 1.6 | return(-1); |
| 132 : | edgomez | 1.9 | } |
| 133 : | Isibaar | 1.1 | |
| 134 : | edgomez | 1.3 | for (k = 0; k < mb_height; k++) { |
| 135 : | for (l = 0; l < mb_width; l++) // do this for all macroblocks individually | ||
| 136 : | Isibaar | 1.1 | { |
| 137 : | edgomez | 1.3 | quant[k * mb_width + l] = (float) framequant; |
| 138 : | |||
| 139 : | Isibaar | 1.1 | // calculate luminance-masking |
| 140 : | edgomez | 1.3 | ptr = &buf[16 * k * stride + 16 * l]; // address of MB |
| 141 : | Isibaar | 1.1 | |
| 142 : | edgomez | 1.3 | val[k * mb_width + l] = 0.; |
| 143 : | |||
| 144 : | for (i = 0; i < 16; i++) | ||
| 145 : | for (j = 0; j < 16; j++) | ||
| 146 : | val[k * mb_width + l] += ptr[i * stride + j]; | ||
| 147 : | val[k * mb_width + l] /= 256.; | ||
| 148 : | Isibaar | 1.5 | global +=val[k * mb_width + l]; |
| 149 : | |||
| 150 : | if ((val[k * mb_width + l] > LowerLimit) && | ||
| 151 : | (val[k * mb_width + l] < UpperLimit)) | ||
| 152 : | mid_range++; | ||
| 153 : | Isibaar | 1.1 | } |
| 154 : | } | ||
| 155 : | |||
| 156 : | Isibaar | 1.5 | global /=mb_width * mb_height; |
| 157 : | Isibaar | 1.1 | |
| 158 : | Isibaar | 1.5 | if (((global <GlobalBrightThres) &&(global >GlobalDarkThres)) |
| 159 : | || (mid_range < MidRangeThres)) { | ||
| 160 : | for (k = 0; k < mb_height; k++) { | ||
| 161 : | for (l = 0; l < mb_width; l++) // do this for all macroblocks individually | ||
| 162 : | { | ||
| 163 : | if (val[k * mb_width + l] < DarkThres) | ||
| 164 : | quant[k * mb_width + l] += | ||
| 165 : | DarkAmpl * (DarkThres - | ||
| 166 : | val[k * mb_width + l]) / DarkThres; | ||
| 167 : | else if (val[k * mb_width + l] > BrightThres) | ||
| 168 : | quant[k * mb_width + l] += | ||
| 169 : | BrightAmpl * (val[k * mb_width + l] - | ||
| 170 : | BrightThres) / (255 - BrightThres); | ||
| 171 : | } | ||
| 172 : | Isibaar | 1.1 | } |
| 173 : | } | ||
| 174 : | edgomez | 1.8 | |
| 175 : | i = normalize_quantizer_field(quant, intquant, | ||
| 176 : | mb_width * mb_height, | ||
| 177 : | min_quant, max_quant); | ||
| 178 : | |||
| 179 : | Isibaar | 1.1 | free(val); |
| 180 : | edgomez | 1.6 | free(quant); |
| 181 : | edgomez | 1.8 | |
| 182 : | return(i); | ||
| 183 : | |||
| 184 : | edgomez | 1.2 | } |
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