FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_xbr.c
Date: 2026-04-19 20:43:40
Exec Total Coverage
Lines: 128 130 98.5%
Functions: 8 8 100.0%
Branches: 601 604 99.5%
Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * Copyright (c) 2011, 2012 Hyllian/Jararaca <sergiogdb@gmail.com>
5 * Copyright (c) 2014 Arwa Arif <arwaarif1994@gmail.com>
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * XBR Filter is used for depixelization of image.
25 * This is based on Hyllian's xBR shader.
26 *
27 * @see https://forums.libretro.com/t/xbr-algorithm-tutorial/123
28 * @see https://github.com/yoyofr/iFBA/blob/master/fba_src/src/intf/video/scalers/xbr.cpp
29 */
30
31 #include "libavutil/opt.h"
32 #include "libavutil/pixdesc.h"
33
34 #include "filters.h"
35 #include "video.h"
36
37 #define LB_MASK 0x00FEFEFE
38 #define RED_BLUE_MASK 0x00FF00FF
39 #define GREEN_MASK 0x0000FF00
40
41 #ifdef PI
42 #undef PI
43 #endif
44
45 typedef int (*xbrfunc_t)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
46
47 typedef struct XBRContext {
48 const AVClass *class;
49 int n;
50 xbrfunc_t func;
51 uint32_t rgbtoyuv[1<<24];
52 } XBRContext;
53
54 typedef struct ThreadData {
55 AVFrame *in, *out;
56 const uint32_t *rgbtoyuv;
57 } ThreadData;
58
59 #define OFFSET(x) offsetof(XBRContext, x)
60 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
61 static const AVOption xbr_options[] = {
62 { "n", "set scale factor", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 4, .flags = FLAGS },
63 { NULL }
64 };
65
66 AVFILTER_DEFINE_CLASS(xbr);
67
68 2704426 static uint32_t pixel_diff(uint32_t x, uint32_t y, const uint32_t *r2y)
69 {
70 #define YMASK 0xff0000
71 #define UMASK 0x00ff00
72 #define VMASK 0x0000ff
73 #define ABSDIFF(a,b) (abs((int)(a)-(int)(b)))
74
75 2704426 uint32_t yuv1 = r2y[x & 0xffffff];
76 2704426 uint32_t yuv2 = r2y[y & 0xffffff];
77
78 2704426 return (ABSDIFF(yuv1 & YMASK, yuv2 & YMASK) >> 16) +
79 5408852 (ABSDIFF(yuv1 & UMASK, yuv2 & UMASK) >> 8) +
80 2704426 ABSDIFF(yuv1 & VMASK, yuv2 & VMASK);
81 }
82
83 #define ALPHA_BLEND_128_W(a, b) ((((a) & LB_MASK) >> 1) + (((b) & LB_MASK) >> 1))
84 #define ALPHA_BLEND_BASE(a, b, m, s) ( (RED_BLUE_MASK & (((a) & RED_BLUE_MASK) + (((((b) & RED_BLUE_MASK) - ((a) & RED_BLUE_MASK)) * (m)) >> (s)))) \
85 | (GREEN_MASK & (((a) & GREEN_MASK) + (((((b) & GREEN_MASK) - ((a) & GREEN_MASK)) * (m)) >> (s)))))
86 #define ALPHA_BLEND_32_W(a, b) ALPHA_BLEND_BASE(a, b, 1, 3)
87 #define ALPHA_BLEND_64_W(a, b) ALPHA_BLEND_BASE(a, b, 1, 2)
88 #define ALPHA_BLEND_192_W(a, b) ALPHA_BLEND_BASE(a, b, 3, 2)
89 #define ALPHA_BLEND_224_W(a, b) ALPHA_BLEND_BASE(a, b, 7, 3)
90
91 #define df(A, B) pixel_diff(A, B, r2y)
92 #define eq(A, B) (df(A, B) < 155)
93
94 #define FILT2(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, \
95 N0, N1, N2, N3) do { \
96 if (PE != PH && PE != PF) { \
97 const unsigned e = df(PE,PC) + df(PE,PG) + df(PI,H5) + df(PI,F4) + (df(PH,PF)<<2); \
98 const unsigned i = df(PH,PD) + df(PH,I5) + df(PF,I4) + df(PF,PB) + (df(PE,PI)<<2); \
99 if (e <= i) { \
100 const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH; \
101 if (e < i && (!eq(PF,PB) && !eq(PH,PD) || eq(PE,PI) \
102 && (!eq(PF,I4) && !eq(PH,I5)) \
103 || eq(PE,PG) || eq(PE,PC))) { \
104 const unsigned ke = df(PF,PG); \
105 const unsigned ki = df(PH,PC); \
106 const int left = ke<<1 <= ki && PE != PG && PD != PG; \
107 const int up = ke >= ki<<1 && PE != PC && PB != PC; \
108 if (left && up) { \
109 E[N3] = ALPHA_BLEND_224_W(E[N3], px); \
110 E[N2] = ALPHA_BLEND_64_W( E[N2], px); \
111 E[N1] = E[N2]; \
112 } else if (left) { \
113 E[N3] = ALPHA_BLEND_192_W(E[N3], px); \
114 E[N2] = ALPHA_BLEND_64_W( E[N2], px); \
115 } else if (up) { \
116 E[N3] = ALPHA_BLEND_192_W(E[N3], px); \
117 E[N1] = ALPHA_BLEND_64_W( E[N1], px); \
118 } else { /* diagonal */ \
119 E[N3] = ALPHA_BLEND_128_W(E[N3], px); \
120 } \
121 } else { \
122 E[N3] = ALPHA_BLEND_128_W(E[N3], px); \
123 } \
124 } \
125 } \
126 } while (0)
127
128 #define FILT3(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, \
129 N0, N1, N2, N3, N4, N5, N6, N7, N8) do { \
130 if (PE != PH && PE != PF) { \
131 const unsigned e = df(PE,PC) + df(PE,PG) + df(PI,H5) + df(PI,F4) + (df(PH,PF)<<2); \
132 const unsigned i = df(PH,PD) + df(PH,I5) + df(PF,I4) + df(PF,PB) + (df(PE,PI)<<2); \
133 if (e <= i) { \
134 const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH; \
135 if (e < i && (!eq(PF,PB) && !eq(PF,PC) || !eq(PH,PD) && !eq(PH,PG) || eq(PE,PI) \
136 && (!eq(PF,F4) && !eq(PF,I4) || !eq(PH,H5) && !eq(PH,I5)) \
137 || eq(PE,PG) || eq(PE,PC))) { \
138 const unsigned ke = df(PF,PG); \
139 const unsigned ki = df(PH,PC); \
140 const int left = ke<<1 <= ki && PE != PG && PD != PG; \
141 const int up = ke >= ki<<1 && PE != PC && PB != PC; \
142 if (left && up) { \
143 E[N7] = ALPHA_BLEND_192_W(E[N7], px); \
144 E[N6] = ALPHA_BLEND_64_W( E[N6], px); \
145 E[N5] = E[N7]; \
146 E[N2] = E[N6]; \
147 E[N8] = px; \
148 } else if (left) { \
149 E[N7] = ALPHA_BLEND_192_W(E[N7], px); \
150 E[N5] = ALPHA_BLEND_64_W( E[N5], px); \
151 E[N6] = ALPHA_BLEND_64_W( E[N6], px); \
152 E[N8] = px; \
153 } else if (up) { \
154 E[N5] = ALPHA_BLEND_192_W(E[N5], px); \
155 E[N7] = ALPHA_BLEND_64_W( E[N7], px); \
156 E[N2] = ALPHA_BLEND_64_W( E[N2], px); \
157 E[N8] = px; \
158 } else { /* diagonal */ \
159 E[N8] = ALPHA_BLEND_224_W(E[N8], px); \
160 E[N5] = ALPHA_BLEND_32_W( E[N5], px); \
161 E[N7] = ALPHA_BLEND_32_W( E[N7], px); \
162 } \
163 } else { \
164 E[N8] = ALPHA_BLEND_128_W(E[N8], px); \
165 } \
166 } \
167 } \
168 } while (0)
169
170 #define FILT4(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, \
171 N15, N14, N11, N3, N7, N10, N13, N12, N9, N6, N2, N1, N5, N8, N4, N0) do { \
172 if (PE != PH && PE != PF) { \
173 const unsigned e = df(PE,PC) + df(PE,PG) + df(PI,H5) + df(PI,F4) + (df(PH,PF)<<2); \
174 const unsigned i = df(PH,PD) + df(PH,I5) + df(PF,I4) + df(PF,PB) + (df(PE,PI)<<2); \
175 if (e <= i) { \
176 const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH; \
177 if (e < i && (!eq(PF,PB) && !eq(PH,PD) || eq(PE,PI) \
178 && (!eq(PF,I4) && !eq(PH,I5)) \
179 || eq(PE,PG) || eq(PE,PC))) { \
180 const unsigned ke = df(PF,PG); \
181 const unsigned ki = df(PH,PC); \
182 const int left = ke<<1 <= ki && PE != PG && PD != PG; \
183 const int up = ke >= ki<<1 && PE != PC && PB != PC; \
184 if (left && up) { \
185 E[N13] = ALPHA_BLEND_192_W(E[N13], px); \
186 E[N12] = ALPHA_BLEND_64_W( E[N12], px); \
187 E[N15] = E[N14] = E[N11] = px; \
188 E[N10] = E[N3] = E[N12]; \
189 E[N7] = E[N13]; \
190 } else if (left) { \
191 E[N11] = ALPHA_BLEND_192_W(E[N11], px); \
192 E[N13] = ALPHA_BLEND_192_W(E[N13], px); \
193 E[N10] = ALPHA_BLEND_64_W( E[N10], px); \
194 E[N12] = ALPHA_BLEND_64_W( E[N12], px); \
195 E[N14] = px; \
196 E[N15] = px; \
197 } else if (up) { \
198 E[N14] = ALPHA_BLEND_192_W(E[N14], px); \
199 E[N7 ] = ALPHA_BLEND_192_W(E[N7 ], px); \
200 E[N10] = ALPHA_BLEND_64_W( E[N10], px); \
201 E[N3 ] = ALPHA_BLEND_64_W( E[N3 ], px); \
202 E[N11] = px; \
203 E[N15] = px; \
204 } else { /* diagonal */ \
205 E[N11] = ALPHA_BLEND_128_W(E[N11], px); \
206 E[N14] = ALPHA_BLEND_128_W(E[N14], px); \
207 E[N15] = px; \
208 } \
209 } else { \
210 E[N15] = ALPHA_BLEND_128_W(E[N15], px); \
211 } \
212 } \
213 } \
214 } while (0)
215
216 54 static av_always_inline void xbr_filter(const ThreadData *td, int jobnr, int nb_jobs, int n)
217 {
218 int x, y;
219 54 const AVFrame *input = td->in;
220 54 AVFrame *output = td->out;
221 54 const uint32_t *r2y = td->rgbtoyuv;
222 54 const int slice_start = (input->height * jobnr ) / nb_jobs;
223 54 const int slice_end = (input->height * (jobnr+1)) / nb_jobs;
224 54 const int nl = output->linesize[0] >> 2;
225 54 const int nl1 = nl + nl;
226 54 const int nl2 = nl1 + nl;
227
228
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 1608 for (y = slice_start; y < slice_end; y++) {
229
230 1554 uint32_t *E = (uint32_t *)(output->data[0] + y * output->linesize[0] * n);
231 1554 const uint32_t *sa2 = (uint32_t *)(input->data[0] + y * input->linesize[0] - 8); /* center */
232 1554 const uint32_t *sa1 = sa2 - (input->linesize[0]>>2); /* up x1 */
233 1554 const uint32_t *sa0 = sa1 - (input->linesize[0]>>2); /* up x2 */
234 1554 const uint32_t *sa3 = sa2 + (input->linesize[0]>>2); /* down x1 */
235 1554 const uint32_t *sa4 = sa3 + (input->linesize[0]>>2); /* down x2 */
236
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 1554 if (y <= 1) {
238 12 sa0 = sa1;
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 12 if (y == 0) {
240 6 sa0 = sa1 = sa2;
241 }
242 }
243
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 1554 if (y >= input->height - 2) {
245 12 sa4 = sa3;
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 12 if (y == input->height - 1) {
247 6 sa4 = sa3 = sa2;
248 }
249 }
250
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 298368 for (x = 0; x < input->width; x++) {
252 296814 const uint32_t B1 = sa0[2];
253 296814 const uint32_t PB = sa1[2];
254 296814 const uint32_t PE = sa2[2];
255 296814 const uint32_t PH = sa3[2];
256 296814 const uint32_t H5 = sa4[2];
257
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 296814 const int pprev = 2 - (x > 0);
259 296814 const uint32_t A1 = sa0[pprev];
260 296814 const uint32_t PA = sa1[pprev];
261 296814 const uint32_t PD = sa2[pprev];
262 296814 const uint32_t PG = sa3[pprev];
263 296814 const uint32_t G5 = sa4[pprev];
264
265 296814 const int pprev2 = pprev - (x > 1);
266 296814 const uint32_t A0 = sa1[pprev2];
267 296814 const uint32_t D0 = sa2[pprev2];
268 296814 const uint32_t G0 = sa3[pprev2];
269
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 296814 const int pnext = 3 - (x == input->width - 1);
271 296814 const uint32_t C1 = sa0[pnext];
272 296814 const uint32_t PC = sa1[pnext];
273 296814 const uint32_t PF = sa2[pnext];
274 296814 const uint32_t PI = sa3[pnext];
275 296814 const uint32_t I5 = sa4[pnext];
276
277 296814 const int pnext2 = pnext + 1 - (x >= input->width - 2);
278 296814 const uint32_t C4 = sa1[pnext2];
279 296814 const uint32_t F4 = sa2[pnext2];
280 296814 const uint32_t I4 = sa3[pnext2];
281
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 296814 if (n == 2) {
283 98938 E[0] = E[1] = // 0, 1
284 98938 E[nl] = E[nl + 1] = PE; // 2, 3
285
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 98938 FILT2(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, 0, 1, nl, nl+1);
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 98938 FILT2(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, nl, 0, nl+1, 1);
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 98938 FILT2(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, nl+1, nl, 1, 0);
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 98938 FILT2(PE, PG, PD, PH, PA, PI, PB, PF, PC, A0, I5, A1, B1, I4, F4, H5, G5, D0, G0, C1, C4, 1, nl+1, 0, nl);
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 197876 } else if (n == 3) {
291 98938 E[0] = E[1] = E[2] = // 0, 1, 2
292 98938 E[nl] = E[nl+1] = E[nl+2] = // 3, 4, 5
293 98938 E[nl1] = E[nl1+1] = E[nl1+2] = PE; // 6, 7, 8
294
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 98938 FILT3(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, 0, 1, 2, nl, nl+1, nl+2, nl1, nl1+1, nl1+2);
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 98938 FILT3(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, nl1, nl, 0, nl1+1, nl+1, 1, nl1+2, nl+2, 2);
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 98938 FILT3(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, nl1+2, nl1+1, nl1, nl+2, nl+1, nl, 2, 1, 0);
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 98938 FILT3(PE, PG, PD, PH, PA, PI, PB, PF, PC, A0, I5, A1, B1, I4, F4, H5, G5, D0, G0, C1, C4, 2, nl+2, nl1+2, 1, nl+1, nl1+1, 0, nl, nl1);
299
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 98938 } else if (n == 4) {
300 98938 E[0] = E[1] = E[2] = E[3] = // 0, 1, 2, 3
301 98938 E[nl] = E[nl+1] = E[nl+2] = E[nl+3] = // 4, 5, 6, 7
302 98938 E[nl1] = E[nl1+1] = E[nl1+2] = E[nl1+3] = // 8, 9, 10, 11
303 98938 E[nl2] = E[nl2+1] = E[nl2+2] = E[nl2+3] = PE; // 12, 13, 14, 15
304
305
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 98938 FILT4(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, nl2+3, nl2+2, nl1+3, 3, nl+3, nl1+2, nl2+1, nl2, nl1+1, nl+2, 2, 1, nl+1, nl1, nl, 0);
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 98938 FILT4(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, 3, nl+3, 2, 0, 1, nl+2, nl1+3, nl2+3, nl1+2, nl+1, nl, nl1, nl1+1, nl2+2, nl2+1, nl2);
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 98938 FILT4(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, 0, 1, nl, nl2, nl1, nl+1, 2, 3, nl+2, nl1+1, nl2+1, nl2+2, nl1+2, nl+3, nl1+3, nl2+3);
308
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 98938 FILT4(PE, PG, PD, PH, PA, PI, PB, PF, PC, A0, I5, A1, B1, I4, F4, H5, G5, D0, G0, C1, C4, nl2, nl1, nl2+1, nl2+3, nl2+2, nl1+1, nl, 0, nl+1, nl1+2, nl1+3, nl+3, nl+2, 1, 2, 3);
309 }
310
311 296814 sa0 += 1;
312 296814 sa1 += 1;
313 296814 sa2 += 1;
314 296814 sa3 += 1;
315 296814 sa4 += 1;
316
317 296814 E += n;
318 }
319 }
320 54 }
321
322 #define XBR_FUNC(size) \
323 static int xbr##size##x(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
324 { \
325 xbr_filter(arg, jobnr, nb_jobs, size); \
326 return 0; \
327 }
328
329 18 XBR_FUNC(2)
330 18 XBR_FUNC(3)
331 18 XBR_FUNC(4)
332
333
334 6 static int config_output(AVFilterLink *outlink)
335 {
336 6 AVFilterContext *ctx = outlink->src;
337 6 XBRContext *s = ctx->priv;
338 6 AVFilterLink *inlink = ctx->inputs[0];
339
340 6 outlink->w = inlink->w * s->n;
341 6 outlink->h = inlink->h * s->n;
342 6 return 0;
343 }
344
345 6 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
346 {
347 6 AVFilterContext *ctx = inlink->dst;
348 6 AVFilterLink *outlink = ctx->outputs[0];
349 6 XBRContext *s = ctx->priv;
350 ThreadData td;
351
352 6 AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
353
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 6 if (!out) {
354 ✗ av_frame_free(&in);
355 ✗ return AVERROR(ENOMEM);
356 }
357
358 6 av_frame_copy_props(out, in);
359
360 6 td.in = in;
361 6 td.out = out;
362 6 td.rgbtoyuv = s->rgbtoyuv;
363 6 ff_filter_execute(ctx, s->func, &td, NULL,
364
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 6 FFMIN(inlink->h, ff_filter_get_nb_threads(ctx)));
365
366 6 out->width = outlink->w;
367 6 out->height = outlink->h;
368
369 6 av_frame_free(&in);
370 6 return ff_filter_frame(outlink, out);
371 }
372
373 9 static av_cold int init(AVFilterContext *ctx)
374 {
375 9 XBRContext *s = ctx->priv;
376 static const xbrfunc_t xbrfuncs[] = {xbr2x, xbr3x, xbr4x};
377
378 uint32_t c;
379 int bg, rg, g;
380
381
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 4608 for (bg = -255; bg < 256; bg++) {
382
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 2354688 for (rg = -255; rg < 256; rg++) {
383 2350089 const uint32_t u = (uint32_t)((-169*rg + 500*bg)/1000) + 128;
384 2350089 const uint32_t v = (uint32_t)(( 500*rg - 81*bg)/1000) + 128;
385
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 2350089 int startg = FFMAX3(-bg, -rg, 0);
386
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 2350089 int endg = FFMIN3(255-bg, 255-rg, 255);
387 2350089 uint32_t y = (uint32_t)(( 299*rg + 1000*startg + 114*bg)/1000);
388 2350089 c = bg + rg * (1 << 16) + 0x010101 * startg;
389
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 153345033 for (g = startg; g <= endg; g++) {
390 150994944 s->rgbtoyuv[c] = ((y++) << 16) + (u << 8) + v;
391 150994944 c+= 0x010101;
392 }
393 }
394 }
395
396 9 s->func = xbrfuncs[s->n - 2];
397 9 return 0;
398 }
399
400 static const AVFilterPad xbr_inputs[] = {
401 {
402 .name = "default",
403 .type = AVMEDIA_TYPE_VIDEO,
404 .filter_frame = filter_frame,
405 },
406 };
407
408 static const AVFilterPad xbr_outputs[] = {
409 {
410 .name = "default",
411 .type = AVMEDIA_TYPE_VIDEO,
412 .config_props = config_output,
413 },
414 };
415
416 const FFFilter ff_vf_xbr = {
417 .p.name = "xbr",
418 .p.description = NULL_IF_CONFIG_SMALL("Scale the input using xBR algorithm."),
419 .p.priv_class = &xbr_class,
420 .p.flags = AVFILTER_FLAG_SLICE_THREADS,
421 FILTER_INPUTS(xbr_inputs),
422 FILTER_OUTPUTS(xbr_outputs),
423 FILTER_SINGLE_PIXFMT(AV_PIX_FMT_0RGB32),
424 .priv_size = sizeof(XBRContext),
425 .init = init,
426 };
427