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1 : | edgomez | 1054 | /***************************************************************************** |
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 : | edgomez | 1162 | * $Id: plugin_lumimasking.c,v 1.1.2.5 2003-10-02 13:54:27 edgomez Exp $ |
24 : | edgomez | 1054 | * |
25 : | ****************************************************************************/ | ||
26 : | |||
27 : | edgomez | 1144 | #include <stdlib.h> |
28 : | edgomez | 1056 | |
29 : | suxen_drol | 926 | #include "../xvid.h" |
30 : | edgomez | 1056 | #include "../portab.h" |
31 : | suxen_drol | 926 | |
32 : | edgomez | 1162 | /***************************************************************************** |
33 : | * Private data type | ||
34 : | ****************************************************************************/ | ||
35 : | edgomez | 1056 | |
36 : | edgomez | 1162 | typedef struct |
37 : | { | ||
38 : | float *quant; | ||
39 : | float *val; | ||
40 : | } lumi_data_t; | ||
41 : | edgomez | 1056 | |
42 : | /***************************************************************************** | ||
43 : | edgomez | 1162 | * Sub plugin functions |
44 : | edgomez | 1056 | ****************************************************************************/ |
45 : | |||
46 : | edgomez | 1162 | static int lumi_plg_info(xvid_plg_info_t *info); |
47 : | static int lumi_plg_create(xvid_plg_create_t *create, lumi_data_t **handle); | ||
48 : | static int lumi_plg_destroy(lumi_data_t *handle, xvid_plg_destroy_t * destroy); | ||
49 : | static int lumi_plg_before(lumi_data_t *handle, xvid_plg_data_t *data); | ||
50 : | static int lumi_plg_after(lumi_data_t *handle, xvid_plg_data_t *data); | ||
51 : | edgomez | 1056 | |
52 : | /***************************************************************************** | ||
53 : | edgomez | 1162 | * The plugin entry function |
54 : | edgomez | 1056 | ****************************************************************************/ |
55 : | |||
56 : | int | ||
57 : | xvid_plugin_lumimasking(void * handle, int opt, void * param1, void * param2) | ||
58 : | suxen_drol | 926 | { |
59 : | edgomez | 1162 | switch(opt) { |
60 : | case XVID_PLG_INFO: | ||
61 : | return(lumi_plg_info((xvid_plg_info_t*)param1)); | ||
62 : | case XVID_PLG_CREATE: | ||
63 : | return(lumi_plg_create((xvid_plg_create_t *)param1, (lumi_data_t **)param2)); | ||
64 : | case XVID_PLG_DESTROY: | ||
65 : | return(lumi_plg_destroy((lumi_data_t *)handle, (xvid_plg_destroy_t*)param1)); | ||
66 : | case XVID_PLG_BEFORE : | ||
67 : | return(lumi_plg_before((lumi_data_t *)handle, (xvid_plg_data_t *)param1)); | ||
68 : | case XVID_PLG_AFTER : | ||
69 : | return(lumi_plg_after((lumi_data_t *)handle, (xvid_plg_data_t *)param1)); | ||
70 : | edgomez | 1056 | } |
71 : | suxen_drol | 926 | |
72 : | edgomez | 1162 | return(XVID_ERR_FAIL); |
73 : | } | ||
74 : | suxen_drol | 926 | |
75 : | edgomez | 1162 | /*---------------------------------------------------------------------------- |
76 : | * Info plugin function | ||
77 : | *--------------------------------------------------------------------------*/ | ||
78 : | suxen_drol | 926 | |
79 : | edgomez | 1162 | static int |
80 : | lumi_plg_info(xvid_plg_info_t *info) | ||
81 : | { | ||
82 : | /* We just require a diff quant array access */ | ||
83 : | info->flags = XVID_REQDQUANTS; | ||
84 : | return(0); | ||
85 : | } | ||
86 : | suxen_drol | 926 | |
87 : | edgomez | 1162 | /*---------------------------------------------------------------------------- |
88 : | * Create plugin function | ||
89 : | * | ||
90 : | * Allocates the private plugin data arrays | ||
91 : | *--------------------------------------------------------------------------*/ | ||
92 : | |||
93 : | static int | ||
94 : | lumi_plg_create(xvid_plg_create_t *create, lumi_data_t **handle) | ||
95 : | { | ||
96 : | lumi_data_t *lumi; | ||
97 : | |||
98 : | if ((lumi = (lumi_data_t*)malloc(sizeof(lumi_data_t))) == NULL) | ||
99 : | return(XVID_ERR_MEMORY); | ||
100 : | |||
101 : | lumi->quant = (float*)malloc(create->mb_width*create->mb_height*sizeof(float)); | ||
102 : | if (lumi->quant == NULL) { | ||
103 : | free(lumi); | ||
104 : | return(XVID_ERR_MEMORY); | ||
105 : | edgomez | 1056 | } |
106 : | suxen_drol | 926 | |
107 : | edgomez | 1162 | lumi->val = (float*)malloc(create->mb_width*create->mb_height*sizeof(float)); |
108 : | if (lumi->val == NULL) { | ||
109 : | free(lumi->quant); | ||
110 : | free(lumi); | ||
111 : | return(XVID_ERR_MEMORY); | ||
112 : | edgomez | 1056 | } |
113 : | suxen_drol | 926 | |
114 : | edgomez | 1162 | /* Bind the data structure to the handle */ |
115 : | *handle = lumi; | ||
116 : | |||
117 : | return(0); | ||
118 : | suxen_drol | 926 | } |
119 : | edgomez | 1056 | |
120 : | edgomez | 1162 | /*---------------------------------------------------------------------------- |
121 : | * Destroy plugin function | ||
122 : | * | ||
123 : | * Free the private plugin data arrays | ||
124 : | *--------------------------------------------------------------------------*/ | ||
125 : | |||
126 : | static int | ||
127 : | lumi_plg_destroy(lumi_data_t *handle, xvid_plg_destroy_t *destroy) | ||
128 : | { | ||
129 : | if (handle) { | ||
130 : | if (handle->quant) { | ||
131 : | free(handle->quant); | ||
132 : | handle->quant = NULL; | ||
133 : | } | ||
134 : | if (handle->val) { | ||
135 : | free(handle->val); | ||
136 : | handle->val = NULL; | ||
137 : | } | ||
138 : | free(handle); | ||
139 : | } | ||
140 : | return(0); | ||
141 : | } | ||
142 : | |||
143 : | /*---------------------------------------------------------------------------- | ||
144 : | * Before plugin function | ||
145 : | * | ||
146 : | * Here is all the magic about lumimasking. | ||
147 : | *--------------------------------------------------------------------------*/ | ||
148 : | |||
149 : | /* Helper function defined later */ | ||
150 : | static int normalize_quantizer_field(float *in, | ||
151 : | int *out, | ||
152 : | int num, | ||
153 : | int min_quant, | ||
154 : | int max_quant); | ||
155 : | |||
156 : | static int | ||
157 : | lumi_plg_before(lumi_data_t *handle, xvid_plg_data_t *data) | ||
158 : | { | ||
159 : | int i, j; | ||
160 : | |||
161 : | float global = 0.0f; | ||
162 : | uint32_t mid_range = 0; | ||
163 : | |||
164 : | const float DarkAmpl = 14 / 2; | ||
165 : | const float BrightAmpl = 10 / 2; | ||
166 : | const float DarkThres = 70; | ||
167 : | const float BrightThres = 200; | ||
168 : | |||
169 : | const float GlobalDarkThres = 60; | ||
170 : | const float GlobalBrightThres = 170; | ||
171 : | |||
172 : | const float MidRangeThres = 20; | ||
173 : | const float UpperLimit = 200; | ||
174 : | const float LowerLimit = 25; | ||
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; | ||
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 : | /* Reset the val value */ | ||
186 : | handle->val[j*data->mb_width + i] = 0.0f; | ||
187 : | |||
188 : | /* Next steps compute the luminance-masking */ | ||
189 : | |||
190 : | /* Get the MB address */ | ||
191 : | ptr = data->current.plane[0]; | ||
192 : | ptr += 16*j*data->current.stride[0] + 16*i; | ||
193 : | |||
194 : | /* Accumulate luminance */ | ||
195 : | for (k = 0; k < 16; k++) | ||
196 : | for (l = 0; l < 16; l++) | ||
197 : | handle->val[j*data->mb_width + i] += ptr[k*data->current.stride[0] + l]; | ||
198 : | |||
199 : | /* Normalize its value */ | ||
200 : | handle->val[j*data->mb_width + i] /= 256.0f; | ||
201 : | |||
202 : | /* Accumulate the global frame luminance */ | ||
203 : | global += handle->val[j*data->mb_width + i]; | ||
204 : | |||
205 : | /* Count the number of middle luminance blocks */ | ||
206 : | if ((handle->val[j*data->mb_width + i] > LowerLimit) && | ||
207 : | (handle->val[j*data->mb_width + i] < UpperLimit)) | ||
208 : | mid_range++; | ||
209 : | } | ||
210 : | } | ||
211 : | |||
212 : | /* Normalize the global luminance accumulator */ | ||
213 : | global /= data->mb_width*data->mb_height; | ||
214 : | |||
215 : | /* Apply luminance masking only to frames where the global luminance is | ||
216 : | * higher than DarkThreshold and lower than Bright Threshold, or where | ||
217 : | * "middle" luminance blocks are lower than its corresponding threshold */ | ||
218 : | if (((global < GlobalBrightThres) && (global > GlobalDarkThres)) || | ||
219 : | (mid_range < MidRangeThres)) { | ||
220 : | |||
221 : | /* Apply the luminance masking formulas to all MBs */ | ||
222 : | for (i = 0; i < data->mb_height; i++) { | ||
223 : | for (j = 0; j < data->mb_width; j++) { | ||
224 : | if (handle->val[i*data->mb_width + j] < DarkThres) | ||
225 : | handle->quant[i*data->mb_width + j] += DarkAmpl * (DarkThres - handle->val[i*data->mb_width + j]) / DarkThres; | ||
226 : | else if (handle->val[i*data->mb_width + j] > BrightThres) | ||
227 : | handle->quant[i*data->mb_width + j] += BrightAmpl * (handle->val[i*data->mb_width + j] - BrightThres) / (255 - BrightThres); | ||
228 : | } | ||
229 : | } | ||
230 : | } | ||
231 : | |||
232 : | /* Normalize the quantizer field */ | ||
233 : | data->quant = normalize_quantizer_field(handle->quant, | ||
234 : | data->dquant, | ||
235 : | data->mb_width*data->mb_height, | ||
236 : | data->quant, | ||
237 : | data->quant*2); | ||
238 : | |||
239 : | /* Plugin job finished */ | ||
240 : | return(0); | ||
241 : | } | ||
242 : | |||
243 : | /*---------------------------------------------------------------------------- | ||
244 : | * After plugin function (dummy function) | ||
245 : | *--------------------------------------------------------------------------*/ | ||
246 : | |||
247 : | static int | ||
248 : | lumi_plg_after(lumi_data_t *handle, xvid_plg_data_t *data) | ||
249 : | { | ||
250 : | return(0); | ||
251 : | } | ||
252 : | |||
253 : | edgomez | 1056 | /***************************************************************************** |
254 : | * Helper functions | ||
255 : | ****************************************************************************/ | ||
256 : | |||
257 : | edgomez | 1162 | #define RDIFF(a, b) ((int)(a+0.5)-(int)(b+0.5)) |
258 : | edgomez | 1056 | |
259 : | static int | ||
260 : | normalize_quantizer_field(float *in, | ||
261 : | int *out, | ||
262 : | int num, | ||
263 : | int min_quant, | ||
264 : | int max_quant) | ||
265 : | { | ||
266 : | int i; | ||
267 : | int finished; | ||
268 : | |||
269 : | do { | ||
270 : | finished = 1; | ||
271 : | for (i = 1; i < num; i++) { | ||
272 : | if (RDIFF(in[i], in[i - 1]) > 2) { | ||
273 : | in[i] -= (float) 0.5; | ||
274 : | finished = 0; | ||
275 : | } else if (RDIFF(in[i], in[i - 1]) < -2) { | ||
276 : | in[i - 1] -= (float) 0.5; | ||
277 : | finished = 0; | ||
278 : | } | ||
279 : | |||
280 : | if (in[i] > max_quant) { | ||
281 : | in[i] = (float) max_quant; | ||
282 : | finished = 0; | ||
283 : | } | ||
284 : | if (in[i] < min_quant) { | ||
285 : | in[i] = (float) min_quant; | ||
286 : | finished = 0; | ||
287 : | } | ||
288 : | if (in[i - 1] > max_quant) { | ||
289 : | in[i - 1] = (float) max_quant; | ||
290 : | finished = 0; | ||
291 : | } | ||
292 : | if (in[i - 1] < min_quant) { | ||
293 : | in[i - 1] = (float) min_quant; | ||
294 : | finished = 0; | ||
295 : | } | ||
296 : | } | ||
297 : | } while (!finished); | ||
298 : | |||
299 : | out[0] = 0; | ||
300 : | for (i = 1; i < num; i++) | ||
301 : | out[i] = RDIFF(in[i], in[i - 1]); | ||
302 : | |||
303 : | return (int) (in[0] + 0.5); | ||
304 : | } |
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