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Revision 1.1.2.4 - (view) (download)
1 : | edgomez | 1.1.2.2 | /***************************************************************************** |
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 | 1.1.2.4 | * $Id$ |
24 : | edgomez | 1.1.2.2 | * |
25 : | ****************************************************************************/ | ||
26 : | |||
27 : | edgomez | 1.1.2.4 | #include <stdlib.h> |
28 : | edgomez | 1.1.2.3 | |
29 : | suxen_drol | 1.1.2.1 | #include "../xvid.h" |
30 : | edgomez | 1.1.2.3 | #include "../portab.h" |
31 : | |||
32 : | |||
33 : | |||
34 : | /***************************************************************************** | ||
35 : | * Prototypes | ||
36 : | ****************************************************************************/ | ||
37 : | |||
38 : | static int | ||
39 : | adaptive_quantization(unsigned char *buf, | ||
40 : | int stride, | ||
41 : | int *intquant, | ||
42 : | int framequant, | ||
43 : | int min_quant, | ||
44 : | int max_quant, | ||
45 : | int mb_width, | ||
46 : | int mb_height); | ||
47 : | |||
48 : | |||
49 : | /***************************************************************************** | ||
50 : | * The plugin entry | ||
51 : | ****************************************************************************/ | ||
52 : | |||
53 : | int | ||
54 : | xvid_plugin_lumimasking(void * handle, int opt, void * param1, void * param2) | ||
55 : | { | ||
56 : | switch(opt) | ||
57 : | { | ||
58 : | case XVID_PLG_INFO : | ||
59 : | { | ||
60 : | xvid_plg_info_t * info = (xvid_plg_info_t*)param1; | ||
61 : | info->flags = XVID_REQDQUANTS; | ||
62 : | return 0; | ||
63 : | } | ||
64 : | |||
65 : | case XVID_PLG_CREATE : | ||
66 : | case XVID_PLG_DESTROY : | ||
67 : | return 0; | ||
68 : | |||
69 : | |||
70 : | case XVID_PLG_BEFORE : | ||
71 : | { | ||
72 : | xvid_plg_data_t * data = (xvid_plg_data_t*)param1; | ||
73 : | data->quant = | ||
74 : | adaptive_quantization(data->current.plane[0], | ||
75 : | data->current.stride[0], | ||
76 : | data->dquant, | ||
77 : | data->quant /* framequant*/, | ||
78 : | data->quant /* min_quant */, | ||
79 : | data->quant*2 /* max_quant */, | ||
80 : | data->mb_width, | ||
81 : | data->mb_height); | ||
82 : | |||
83 : | return 0; | ||
84 : | } | ||
85 : | |||
86 : | case XVID_PLG_AFTER : | ||
87 : | return 0; | ||
88 : | } | ||
89 : | |||
90 : | return XVID_ERR_FAIL; | ||
91 : | } | ||
92 : | |||
93 : | /***************************************************************************** | ||
94 : | * Helper functions | ||
95 : | ****************************************************************************/ | ||
96 : | |||
97 : | #define RDIFF(a,b) ((int)(a+0.5)-(int)(b+0.5)) | ||
98 : | suxen_drol | 1.1.2.1 | |
99 : | edgomez | 1.1.2.3 | static int |
100 : | normalize_quantizer_field(float *in, | ||
101 : | int *out, | ||
102 : | int num, | ||
103 : | int min_quant, | ||
104 : | int max_quant) | ||
105 : | suxen_drol | 1.1.2.1 | { |
106 : | edgomez | 1.1.2.3 | int i; |
107 : | int finished; | ||
108 : | |||
109 : | do { | ||
110 : | finished = 1; | ||
111 : | for (i = 1; i < num; i++) { | ||
112 : | if (RDIFF(in[i], in[i - 1]) > 2) { | ||
113 : | in[i] -= (float) 0.5; | ||
114 : | finished = 0; | ||
115 : | } else if (RDIFF(in[i], in[i - 1]) < -2) { | ||
116 : | in[i - 1] -= (float) 0.5; | ||
117 : | finished = 0; | ||
118 : | } | ||
119 : | |||
120 : | if (in[i] > max_quant) { | ||
121 : | in[i] = (float) max_quant; | ||
122 : | finished = 0; | ||
123 : | } | ||
124 : | if (in[i] < min_quant) { | ||
125 : | in[i] = (float) min_quant; | ||
126 : | finished = 0; | ||
127 : | } | ||
128 : | if (in[i - 1] > max_quant) { | ||
129 : | in[i - 1] = (float) max_quant; | ||
130 : | finished = 0; | ||
131 : | } | ||
132 : | if (in[i - 1] < min_quant) { | ||
133 : | in[i - 1] = (float) min_quant; | ||
134 : | finished = 0; | ||
135 : | } | ||
136 : | } | ||
137 : | } while (!finished); | ||
138 : | |||
139 : | out[0] = 0; | ||
140 : | for (i = 1; i < num; i++) | ||
141 : | out[i] = RDIFF(in[i], in[i - 1]); | ||
142 : | |||
143 : | return (int) (in[0] + 0.5); | ||
144 : | } | ||
145 : | |||
146 : | static int | ||
147 : | adaptive_quantization(unsigned char *buf, | ||
148 : | int stride, | ||
149 : | int *intquant, | ||
150 : | int framequant, | ||
151 : | int min_quant, | ||
152 : | int max_quant, | ||
153 : | int mb_width, | ||
154 : | int mb_height) /* no qstride because normalization */ | ||
155 : | { | ||
156 : | int i, j, k, l; | ||
157 : | |||
158 : | float *quant; | ||
159 : | unsigned char *ptr; | ||
160 : | float *val; | ||
161 : | float global = 0.; | ||
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 : | |||
177 : | if (!(quant = (float *) malloc(mb_width * mb_height * sizeof(float)))) | ||
178 : | return(-1); | ||
179 : | |||
180 : | if(!(val = (float *) malloc(mb_width * mb_height * sizeof(float)))) | ||
181 : | return(-1); | ||
182 : | |||
183 : | for (k = 0; k < mb_height; k++) { | ||
184 : | for (l = 0; l < mb_width; l++) /* do this for all macroblocks individually */ | ||
185 : | { | ||
186 : | quant[k * mb_width + l] = (float) framequant; | ||
187 : | |||
188 : | /* calculate luminance-masking */ | ||
189 : | ptr = &buf[16 * k * stride + 16 * l]; /* address of MB */ | ||
190 : | |||
191 : | val[k * mb_width + l] = 0.; | ||
192 : | |||
193 : | for (i = 0; i < 16; i++) | ||
194 : | for (j = 0; j < 16; j++) | ||
195 : | val[k * mb_width + l] += ptr[i * stride + j]; | ||
196 : | val[k * mb_width + l] /= 256.; | ||
197 : | global +=val[k * mb_width + l]; | ||
198 : | |||
199 : | if ((val[k * mb_width + l] > LowerLimit) && | ||
200 : | (val[k * mb_width + l] < UpperLimit)) | ||
201 : | mid_range++; | ||
202 : | } | ||
203 : | } | ||
204 : | |||
205 : | global /=mb_width * mb_height; | ||
206 : | |||
207 : | if (((global <GlobalBrightThres) &&(global >GlobalDarkThres)) | ||
208 : | || (mid_range < MidRangeThres)) { | ||
209 : | for (k = 0; k < mb_height; k++) { | ||
210 : | for (l = 0; l < mb_width; l++) /* do this for all macroblocks individually */ | ||
211 : | { | ||
212 : | if (val[k * mb_width + l] < DarkThres) | ||
213 : | quant[k * mb_width + l] += | ||
214 : | DarkAmpl * (DarkThres - | ||
215 : | val[k * mb_width + l]) / DarkThres; | ||
216 : | else if (val[k * mb_width + l] > BrightThres) | ||
217 : | quant[k * mb_width + l] += | ||
218 : | BrightAmpl * (val[k * mb_width + l] - | ||
219 : | BrightThres) / (255 - BrightThres); | ||
220 : | } | ||
221 : | } | ||
222 : | } | ||
223 : | |||
224 : | i = normalize_quantizer_field(quant, intquant, | ||
225 : | mb_width * mb_height, | ||
226 : | min_quant, max_quant); | ||
227 : | |||
228 : | free(val); | ||
229 : | free(quant); | ||
230 : | |||
231 : | return(i); | ||
232 : | suxen_drol | 1.1.2.1 | |
233 : | } |
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