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| 1 : | edgomez | 1382 | /***************************************************************************** |
| 2 : | * | ||
| 3 : | * XVID MPEG-4 VIDEO CODEC | ||
| 4 : | * - XviD plugin: performs a lumimasking algorithm on encoded frame - | ||
| 5 : | * | ||
| 6 : | * Copyright(C) 2002-2003 Peter Ross <pross@xvid.org> | ||
| 7 : | * 2002 Christoph Lampert <gruel@web.de> | ||
| 8 : | * | ||
| 9 : | * This program is free software ; you can redistribute it and/or modify | ||
| 10 : | * it under the terms of the GNU General Public License as published by | ||
| 11 : | * the Free Software Foundation ; either version 2 of the License, or | ||
| 12 : | * (at your option) any later version. | ||
| 13 : | * | ||
| 14 : | * This program is distributed in the hope that it will be useful, | ||
| 15 : | * but WITHOUT ANY WARRANTY ; without even the implied warranty of | ||
| 16 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 17 : | * GNU General Public License for more details. | ||
| 18 : | * | ||
| 19 : | * You should have received a copy of the GNU General Public License | ||
| 20 : | * along with this program ; if not, write to the Free Software | ||
| 21 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| 22 : | * | ||
| 23 : | suxen_drol | 1399 | * $Id: plugin_lumimasking.c,v 1.3 2004-04-02 22:20:31 suxen_drol Exp $ |
| 24 : | edgomez | 1382 | * |
| 25 : | ****************************************************************************/ | ||
| 26 : | |||
| 27 : | #include <stdlib.h> | ||
| 28 : | |||
| 29 : | #include "../xvid.h" | ||
| 30 : | #include "../portab.h" | ||
| 31 : | #include "../utils/emms.h" | ||
| 32 : | |||
| 33 : | /***************************************************************************** | ||
| 34 : | * Private data type | ||
| 35 : | ****************************************************************************/ | ||
| 36 : | |||
| 37 : | typedef struct | ||
| 38 : | { | ||
| 39 : | float *quant; | ||
| 40 : | float *val; | ||
| 41 : | } lumi_data_t; | ||
| 42 : | |||
| 43 : | /***************************************************************************** | ||
| 44 : | * Sub plugin functions | ||
| 45 : | ****************************************************************************/ | ||
| 46 : | |||
| 47 : | static int lumi_plg_info(xvid_plg_info_t *info); | ||
| 48 : | static int lumi_plg_create(xvid_plg_create_t *create, lumi_data_t **handle); | ||
| 49 : | static int lumi_plg_destroy(lumi_data_t *handle, xvid_plg_destroy_t * destroy); | ||
| 50 : | static int lumi_plg_frame(lumi_data_t *handle, xvid_plg_data_t *data); | ||
| 51 : | static int lumi_plg_after(lumi_data_t *handle, xvid_plg_data_t *data); | ||
| 52 : | |||
| 53 : | /***************************************************************************** | ||
| 54 : | * The plugin entry function | ||
| 55 : | ****************************************************************************/ | ||
| 56 : | |||
| 57 : | int | ||
| 58 : | xvid_plugin_lumimasking(void * handle, int opt, void * param1, void * param2) | ||
| 59 : | { | ||
| 60 : | switch(opt) { | ||
| 61 : | case XVID_PLG_INFO: | ||
| 62 : | return(lumi_plg_info((xvid_plg_info_t*)param1)); | ||
| 63 : | case XVID_PLG_CREATE: | ||
| 64 : | return(lumi_plg_create((xvid_plg_create_t *)param1, (lumi_data_t **)param2)); | ||
| 65 : | case XVID_PLG_DESTROY: | ||
| 66 : | return(lumi_plg_destroy((lumi_data_t *)handle, (xvid_plg_destroy_t*)param1)); | ||
| 67 : | case XVID_PLG_BEFORE : | ||
| 68 : | return 0; | ||
| 69 : | case XVID_PLG_FRAME : | ||
| 70 : | return(lumi_plg_frame((lumi_data_t *)handle, (xvid_plg_data_t *)param1)); | ||
| 71 : | case XVID_PLG_AFTER : | ||
| 72 : | return(lumi_plg_after((lumi_data_t *)handle, (xvid_plg_data_t *)param1)); | ||
| 73 : | } | ||
| 74 : | |||
| 75 : | return(XVID_ERR_FAIL); | ||
| 76 : | } | ||
| 77 : | |||
| 78 : | /*---------------------------------------------------------------------------- | ||
| 79 : | * Info plugin function | ||
| 80 : | *--------------------------------------------------------------------------*/ | ||
| 81 : | |||
| 82 : | static int | ||
| 83 : | lumi_plg_info(xvid_plg_info_t *info) | ||
| 84 : | { | ||
| 85 : | /* We just require a diff quant array access */ | ||
| 86 : | info->flags = XVID_REQDQUANTS; | ||
| 87 : | return(0); | ||
| 88 : | } | ||
| 89 : | |||
| 90 : | /*---------------------------------------------------------------------------- | ||
| 91 : | * Create plugin function | ||
| 92 : | * | ||
| 93 : | * Allocates the private plugin data arrays | ||
| 94 : | *--------------------------------------------------------------------------*/ | ||
| 95 : | |||
| 96 : | static int | ||
| 97 : | lumi_plg_create(xvid_plg_create_t *create, lumi_data_t **handle) | ||
| 98 : | { | ||
| 99 : | lumi_data_t *lumi; | ||
| 100 : | |||
| 101 : | if ((lumi = (lumi_data_t*)malloc(sizeof(lumi_data_t))) == NULL) | ||
| 102 : | return(XVID_ERR_MEMORY); | ||
| 103 : | |||
| 104 : | lumi->quant = (float*)malloc(create->mb_width*create->mb_height*sizeof(float)); | ||
| 105 : | if (lumi->quant == NULL) { | ||
| 106 : | free(lumi); | ||
| 107 : | return(XVID_ERR_MEMORY); | ||
| 108 : | } | ||
| 109 : | |||
| 110 : | lumi->val = (float*)malloc(create->mb_width*create->mb_height*sizeof(float)); | ||
| 111 : | if (lumi->val == NULL) { | ||
| 112 : | free(lumi->quant); | ||
| 113 : | free(lumi); | ||
| 114 : | return(XVID_ERR_MEMORY); | ||
| 115 : | } | ||
| 116 : | |||
| 117 : | /* Bind the data structure to the handle */ | ||
| 118 : | *handle = lumi; | ||
| 119 : | |||
| 120 : | return(0); | ||
| 121 : | } | ||
| 122 : | |||
| 123 : | /*---------------------------------------------------------------------------- | ||
| 124 : | * Destroy plugin function | ||
| 125 : | * | ||
| 126 : | * Free the private plugin data arrays | ||
| 127 : | *--------------------------------------------------------------------------*/ | ||
| 128 : | |||
| 129 : | static int | ||
| 130 : | lumi_plg_destroy(lumi_data_t *handle, xvid_plg_destroy_t *destroy) | ||
| 131 : | { | ||
| 132 : | if (handle) { | ||
| 133 : | if (handle->quant) { | ||
| 134 : | free(handle->quant); | ||
| 135 : | handle->quant = NULL; | ||
| 136 : | } | ||
| 137 : | if (handle->val) { | ||
| 138 : | free(handle->val); | ||
| 139 : | handle->val = NULL; | ||
| 140 : | } | ||
| 141 : | free(handle); | ||
| 142 : | } | ||
| 143 : | return(0); | ||
| 144 : | } | ||
| 145 : | |||
| 146 : | /*---------------------------------------------------------------------------- | ||
| 147 : | * Before plugin function | ||
| 148 : | * | ||
| 149 : | * Here is all the magic about lumimasking. | ||
| 150 : | *--------------------------------------------------------------------------*/ | ||
| 151 : | |||
| 152 : | /* Helper function defined later */ | ||
| 153 : | static int normalize_quantizer_field(float *in, | ||
| 154 : | int *out, | ||
| 155 : | int num, | ||
| 156 : | int min_quant, | ||
| 157 : | int max_quant); | ||
| 158 : | |||
| 159 : | static int | ||
| 160 : | lumi_plg_frame(lumi_data_t *handle, xvid_plg_data_t *data) | ||
| 161 : | { | ||
| 162 : | int i, j; | ||
| 163 : | |||
| 164 : | float global = 0.0f; | ||
| 165 : | |||
| 166 : | const float DarkAmpl = 14 / 4; | ||
| 167 : | const float BrightAmpl = 10 / 3; | ||
| 168 : | float DarkThres = 90; | ||
| 169 : | float BrightThres = 200; | ||
| 170 : | |||
| 171 : | const float GlobalDarkThres = 60; | ||
| 172 : | const float GlobalBrightThres = 170; | ||
| 173 : | |||
| 174 : | if (data->type == XVID_TYPE_BVOP) return 0; | ||
| 175 : | |||
| 176 : | /* Do this for all macroblocks individually */ | ||
| 177 : | for (j = 0; j < data->mb_height; j++) { | ||
| 178 : | for (i = 0; i < data->mb_width; i++) { | ||
| 179 : | int k, l, sum = 0; | ||
| 180 : | unsigned char *ptr; | ||
| 181 : | |||
| 182 : | /* Initialize the current quant value to the frame quant */ | ||
| 183 : | handle->quant[j*data->mb_width + i] = (float)data->quant; | ||
| 184 : | |||
| 185 : | /* Next steps compute the luminance-masking */ | ||
| 186 : | |||
| 187 : | /* Get the MB address */ | ||
| 188 : | ptr = data->current.plane[0]; | ||
| 189 : | ptr += 16*j*data->current.stride[0] + 16*i; | ||
| 190 : | |||
| 191 : | /* Accumulate luminance */ | ||
| 192 : | for (k = 0; k < 16; k++) | ||
| 193 : | for (l = 0; l < 16; l++) | ||
| 194 : | sum += ptr[k*data->current.stride[0] + l]; | ||
| 195 : | |||
| 196 : | handle->val[j*data->mb_width + i] = (float)sum/256.0f; | ||
| 197 : | |||
| 198 : | /* Accumulate the global frame luminance */ | ||
| 199 : | global += (float)sum/256.0f; | ||
| 200 : | } | ||
| 201 : | } | ||
| 202 : | |||
| 203 : | /* Normalize the global luminance accumulator */ | ||
| 204 : | global /= data->mb_width*data->mb_height; | ||
| 205 : | |||
| 206 : | suxen_drol | 1399 | DarkThres = DarkThres*global/127.0f; |
| 207 : | BrightThres = BrightThres*global/127.0f; | ||
| 208 : | edgomez | 1382 | |
| 209 : | |||
| 210 : | /* Apply luminance masking only to frames where the global luminance is | ||
| 211 : | * higher than DarkThreshold and lower than Bright Threshold */ | ||
| 212 : | if ((global < GlobalBrightThres) && (global > GlobalDarkThres)) { | ||
| 213 : | |||
| 214 : | /* Apply the luminance masking formulas to all MBs */ | ||
| 215 : | for (i = 0; i < data->mb_height; i++) { | ||
| 216 : | for (j = 0; j < data->mb_width; j++) { | ||
| 217 : | if (handle->val[i*data->mb_width + j] < DarkThres) | ||
| 218 : | handle->quant[i*data->mb_width + j] *= 1 + DarkAmpl * (DarkThres - handle->val[i*data->mb_width + j]) / DarkThres; | ||
| 219 : | else if (handle->val[i*data->mb_width + j] > BrightThres) | ||
| 220 : | handle->quant[i*data->mb_width + j] *= 1 + BrightAmpl * (handle->val[i*data->mb_width + j] - BrightThres) / (255 - BrightThres); | ||
| 221 : | } | ||
| 222 : | } | ||
| 223 : | } | ||
| 224 : | |||
| 225 : | /* Normalize the quantizer field */ | ||
| 226 : | data->quant = normalize_quantizer_field(handle->quant, | ||
| 227 : | data->dquant, | ||
| 228 : | data->mb_width*data->mb_height, | ||
| 229 : | data->quant, | ||
| 230 : | data->quant + data->quant/2); | ||
| 231 : | |||
| 232 : | /* Plugin job finished */ | ||
| 233 : | return(0); | ||
| 234 : | } | ||
| 235 : | |||
| 236 : | /*---------------------------------------------------------------------------- | ||
| 237 : | * After plugin function (dummy function) | ||
| 238 : | *--------------------------------------------------------------------------*/ | ||
| 239 : | |||
| 240 : | static int | ||
| 241 : | lumi_plg_after(lumi_data_t *handle, xvid_plg_data_t *data) | ||
| 242 : | { | ||
| 243 : | return(0); | ||
| 244 : | } | ||
| 245 : | |||
| 246 : | /***************************************************************************** | ||
| 247 : | * Helper functions | ||
| 248 : | ****************************************************************************/ | ||
| 249 : | |||
| 250 : | #define RDIFF(a, b) ((int)(a+0.5)-(int)(b+0.5)) | ||
| 251 : | |||
| 252 : | static int | ||
| 253 : | normalize_quantizer_field(float *in, | ||
| 254 : | int *out, | ||
| 255 : | int num, | ||
| 256 : | int min_quant, | ||
| 257 : | int max_quant) | ||
| 258 : | { | ||
| 259 : | int i; | ||
| 260 : | int finished; | ||
| 261 : | |||
| 262 : | do { | ||
| 263 : | finished = 1; | ||
| 264 : | for (i = 1; i < num; i++) { | ||
| 265 : | if (RDIFF(in[i], in[i - 1]) > 2) { | ||
| 266 : | in[i] -= (float) 0.5; | ||
| 267 : | finished = 0; | ||
| 268 : | } else if (RDIFF(in[i], in[i - 1]) < -2) { | ||
| 269 : | in[i - 1] -= (float) 0.5; | ||
| 270 : | finished = 0; | ||
| 271 : | } | ||
| 272 : | |||
| 273 : | if (in[i] > max_quant) { | ||
| 274 : | in[i] = (float) max_quant; | ||
| 275 : | finished = 0; | ||
| 276 : | } | ||
| 277 : | if (in[i] < min_quant) { | ||
| 278 : | in[i] = (float) min_quant; | ||
| 279 : | finished = 0; | ||
| 280 : | } | ||
| 281 : | if (in[i - 1] > max_quant) { | ||
| 282 : | in[i - 1] = (float) max_quant; | ||
| 283 : | finished = 0; | ||
| 284 : | } | ||
| 285 : | if (in[i - 1] < min_quant) { | ||
| 286 : | in[i - 1] = (float) min_quant; | ||
| 287 : | finished = 0; | ||
| 288 : | } | ||
| 289 : | } | ||
| 290 : | } while (!finished); | ||
| 291 : | |||
| 292 : | out[0] = 0; | ||
| 293 : | for (i = 1; i < num; i++) | ||
| 294 : | out[i] = RDIFF(in[i], in[i - 1]); | ||
| 295 : | |||
| 296 : | return (int) (in[0] + 0.5); | ||
| 297 : | } |
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