FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_super2xsai.c
Date: 2025-06-30 14:39:11
Exec Total Coverage
Lines: 181 185 97.8%
Functions: 4 4 100.0%
Branches: 151 177 85.3%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2010 Niel van der Westhuizen <nielkie@gmail.com>
3 * Copyright (c) 2002 A'rpi
4 * Copyright (c) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 /**
24 * @file
25 * Super 2xSaI video filter
26 * Ported from MPlayer libmpcodecs/vf_2xsai.c.
27 */
28
29 #include "libavutil/pixdesc.h"
30 #include "libavutil/intreadwrite.h"
31 #include "avfilter.h"
32 #include "filters.h"
33 #include "video.h"
34
35 typedef struct Super2xSaIContext {
36 /* masks used for two pixels interpolation */
37 uint32_t hi_pixel_mask;
38 uint32_t lo_pixel_mask;
39
40 /* masks used for four pixels interpolation */
41 uint32_t q_hi_pixel_mask;
42 uint32_t q_lo_pixel_mask;
43
44 int bpp; ///< bytes per pixel, pixel stride for each (packed) pixel
45 int is_be;
46 } Super2xSaIContext;
47
48 typedef struct ThreadData {
49 AVFrame *in, *out;
50 } ThreadData;
51
52 #define GET_RESULT(A, B, C, D) ((A != C || A != D) - (B != C || B != D))
53
54 #define INTERPOLATE(A, B) (((A & hi_pixel_mask) >> 1) + ((B & hi_pixel_mask) >> 1) + (A & B & lo_pixel_mask))
55
56 #define Q_INTERPOLATE(A, B, C, D) ((A & q_hi_pixel_mask) >> 2) + ((B & q_hi_pixel_mask) >> 2) + ((C & q_hi_pixel_mask) >> 2) + ((D & q_hi_pixel_mask) >> 2) \
57 + ((((A & q_lo_pixel_mask) + (B & q_lo_pixel_mask) + (C & q_lo_pixel_mask) + (D & q_lo_pixel_mask)) >> 2) & q_lo_pixel_mask)
58
59 14 static int super2xsai(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
60 {
61 14 Super2xSaIContext *s = ctx->priv;
62 14 ThreadData *td = arg;
63 14 AVFrame *in = td->in;
64 14 AVFrame *out = td->out;
65 14 const uint8_t *src = in->data[0];
66 14 uint8_t *dst = out->data[0];
67 14 const int src_linesize = in->linesize[0];
68 14 const int dst_linesize = out->linesize[0];
69 14 const int width = in->width;
70 14 const int height = in->height;
71 unsigned int x, y;
72 uint32_t color[4][4];
73 const uint8_t *src_line[4];
74 14 const int bpp = s->bpp;
75 14 const uint32_t hi_pixel_mask = s->hi_pixel_mask;
76 14 const uint32_t lo_pixel_mask = s->lo_pixel_mask;
77 14 const uint32_t q_hi_pixel_mask = s->q_hi_pixel_mask;
78 14 const uint32_t q_lo_pixel_mask = s->q_lo_pixel_mask;
79 14 const int slice_start = (height * jobnr) / nb_jobs;
80 14 const int slice_end = (height * (jobnr+1)) / nb_jobs;
81
82 /* Point to the first 4 lines, first line is duplicated */
83 14 src_line[0] = src + src_linesize*FFMAX(slice_start - 1, 0);
84 14 src_line[1] = src + src_linesize*slice_start;
85
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 14 src_line[2] = src + src_linesize*FFMIN(slice_start + 1, height-1);
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 14 src_line[3] = src + src_linesize*FFMIN(slice_start + 2, height-1);
87
88 #define READ_COLOR4(dst, src_line, off) dst = *((const uint32_t *)src_line + off)
89 #define READ_COLOR3(dst, src_line, off) dst = AV_RL24 (src_line + 3*off)
90 #define READ_COLOR2(dst, src_line, off) dst = s->is_be ? AV_RB16(src_line + 2 * off) : AV_RL16(src_line + 2 * off)
91
92
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 4046 for (y = slice_start; y < slice_end; y++) {
93 uint8_t *dst_line[2];
94
95 4032 dst_line[0] = dst + dst_linesize*2*y;
96 4032 dst_line[1] = dst + dst_linesize*(2*y+1);
97
98
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 4032 switch (bpp) {
99 1152 case 4:
100 1152 READ_COLOR4(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR4(color[0][2], src_line[0], 1); READ_COLOR4(color[0][3], src_line[0], 2);
101 1152 READ_COLOR4(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR4(color[1][2], src_line[1], 1); READ_COLOR4(color[1][3], src_line[1], 2);
102 1152 READ_COLOR4(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR4(color[2][2], src_line[2], 1); READ_COLOR4(color[2][3], src_line[2], 2);
103 1152 READ_COLOR4(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR4(color[3][2], src_line[3], 1); READ_COLOR4(color[3][3], src_line[3], 2);
104 1152 break;
105 576 case 3:
106 576 READ_COLOR3(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR3(color[0][2], src_line[0], 1); READ_COLOR3(color[0][3], src_line[0], 2);
107 576 READ_COLOR3(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR3(color[1][2], src_line[1], 1); READ_COLOR3(color[1][3], src_line[1], 2);
108 576 READ_COLOR3(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR3(color[2][2], src_line[2], 1); READ_COLOR3(color[2][3], src_line[2], 2);
109 576 READ_COLOR3(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR3(color[3][2], src_line[3], 1); READ_COLOR3(color[3][3], src_line[3], 2);
110 576 break;
111 2304 default:
112
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 2304 READ_COLOR2(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR2(color[0][2], src_line[0], 1); READ_COLOR2(color[0][3], src_line[0], 2);
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 2304 READ_COLOR2(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR2(color[1][2], src_line[1], 1); READ_COLOR2(color[1][3], src_line[1], 2);
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 2304 READ_COLOR2(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR2(color[2][2], src_line[2], 1); READ_COLOR2(color[2][3], src_line[2], 2);
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 2304 READ_COLOR2(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR2(color[3][2], src_line[3], 1); READ_COLOR2(color[3][3], src_line[3], 2);
116 }
117
118
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 1423296 for (x = 0; x < width; x++) {
119 uint32_t product1a, product1b, product2a, product2b;
120
121 //--------------------------------------- B0 B1 B2 B3 0 1 2 3
122 // 4 5* 6 S2 -> 4 5* 6 7
123 // 1 2 3 S1 8 9 10 11
124 // A0 A1 A2 A3 12 13 14 15
125 //--------------------------------------
126
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 1419264 if (color[2][1] == color[1][2] && color[1][1] != color[2][2]) {
127 33756 product2b = color[2][1];
128 33756 product1b = product2b;
129
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 1385508 } else if (color[1][1] == color[2][2] && color[2][1] != color[1][2]) {
130 1754 product2b = color[1][1];
131 1754 product1b = product2b;
132
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 1383754 } else if (color[1][1] == color[2][2] && color[2][1] == color[1][2]) {
133 146 int r = 0;
134
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 146 r += GET_RESULT(color[1][2], color[1][1], color[1][0], color[3][1]);
136
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 146 r += GET_RESULT(color[1][2], color[1][1], color[2][0], color[0][1]);
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 146 r += GET_RESULT(color[1][2], color[1][1], color[3][2], color[2][3]);
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 146 r += GET_RESULT(color[1][2], color[1][1], color[0][2], color[1][3]);
139
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 146 if (r > 0)
141 ✗ product1b = color[1][2];
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 146 else if (r < 0)
143 ✗ product1b = color[1][1];
144 else
145 146 product1b = INTERPOLATE(color[1][1], color[1][2]);
146
147 146 product2b = product1b;
148 } else {
149
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 1383608 if (color[1][2] == color[2][2] && color[2][2] == color[3][1] && color[2][1] != color[3][2] && color[2][2] != color[3][0])
150 104 product2b = Q_INTERPOLATE(color[2][2], color[2][2], color[2][2], color[2][1]);
151
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 1383504 else if (color[1][1] == color[2][1] && color[2][1] == color[3][2] && color[3][1] != color[2][2] && color[2][1] != color[3][3])
152 24 product2b = Q_INTERPOLATE(color[2][1], color[2][1], color[2][1], color[2][2]);
153 else
154 1383480 product2b = INTERPOLATE(color[2][1], color[2][2]);
155
156
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 1383608 if (color[1][2] == color[2][2] && color[1][2] == color[0][1] && color[1][1] != color[0][2] && color[1][2] != color[0][0])
157 28 product1b = Q_INTERPOLATE(color[1][2], color[1][2], color[1][2], color[1][1]);
158
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 1383580 else if (color[1][1] == color[2][1] && color[1][1] == color[0][2] && color[0][1] != color[1][2] && color[1][1] != color[0][3])
159 618 product1b = Q_INTERPOLATE(color[1][2], color[1][1], color[1][1], color[1][1]);
160 else
161 1382962 product1b = INTERPOLATE(color[1][1], color[1][2]);
162 }
163
164
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 1419264 if (color[1][1] == color[2][2] && color[2][1] != color[1][2] && color[1][0] == color[1][1] && color[1][1] != color[3][2])
165 12 product2a = INTERPOLATE(color[2][1], color[1][1]);
166
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 1419252 else if (color[1][1] == color[2][0] && color[1][2] == color[1][1] && color[1][0] != color[2][1] && color[1][1] != color[3][0])
167 216 product2a = INTERPOLATE(color[2][1], color[1][1]);
168 else
169 1419036 product2a = color[2][1];
170
171
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 1419264 if (color[2][1] == color[1][2] && color[1][1] != color[2][2] && color[2][0] == color[2][1] && color[2][1] != color[0][2])
172 128 product1a = INTERPOLATE(color[2][1], color[1][1]);
173
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 1419136 else if (color[1][0] == color[2][1] && color[2][2] == color[2][1] && color[2][0] != color[1][1] && color[2][1] != color[0][0])
174 40 product1a = INTERPOLATE(color[2][1], color[1][1]);
175 else
176 1419096 product1a = color[1][1];
177
178 /* Set the calculated pixels */
179
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 1419264 switch (bpp) {
180 405504 case 4:
181 405504 AV_WN32A(dst_line[0] + x * 8, product1a);
182 405504 AV_WN32A(dst_line[0] + x * 8 + 4, product1b);
183 405504 AV_WN32A(dst_line[1] + x * 8, product2a);
184 405504 AV_WN32A(dst_line[1] + x * 8 + 4, product2b);
185 405504 break;
186 202752 case 3:
187 202752 AV_WL24(dst_line[0] + x * 6, product1a);
188 202752 AV_WL24(dst_line[0] + x * 6 + 3, product1b);
189 202752 AV_WL24(dst_line[1] + x * 6, product2a);
190 202752 AV_WL24(dst_line[1] + x * 6 + 3, product2b);
191 202752 break;
192 811008 default: // bpp = 2
193
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 811008 if (s->is_be) {
194 405504 AV_WB32(dst_line[0] + x * 4, product1a | (product1b << 16));
195 405504 AV_WB32(dst_line[1] + x * 4, product2a | (product2b << 16));
196 } else {
197 405504 AV_WL32(dst_line[0] + x * 4, product1a | (product1b << 16));
198 405504 AV_WL32(dst_line[1] + x * 4, product2a | (product2b << 16));
199 }
200 }
201
202 /* Move color matrix forward */
203 1419264 color[0][0] = color[0][1]; color[0][1] = color[0][2]; color[0][2] = color[0][3];
204 1419264 color[1][0] = color[1][1]; color[1][1] = color[1][2]; color[1][2] = color[1][3];
205 1419264 color[2][0] = color[2][1]; color[2][1] = color[2][2]; color[2][2] = color[2][3];
206 1419264 color[3][0] = color[3][1]; color[3][1] = color[3][2]; color[3][2] = color[3][3];
207
208
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 1419264 if (x < width - 3) {
209 1407168 x += 3;
210
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 1407168 switch (bpp) {
211 402048 case 4:
212 402048 READ_COLOR4(color[0][3], src_line[0], x);
213 402048 READ_COLOR4(color[1][3], src_line[1], x);
214 402048 READ_COLOR4(color[2][3], src_line[2], x);
215 402048 READ_COLOR4(color[3][3], src_line[3], x);
216 402048 break;
217 201024 case 3:
218 201024 READ_COLOR3(color[0][3], src_line[0], x);
219 201024 READ_COLOR3(color[1][3], src_line[1], x);
220 201024 READ_COLOR3(color[2][3], src_line[2], x);
221 201024 READ_COLOR3(color[3][3], src_line[3], x);
222 201024 break;
223 804096 default: /* case 2 */
224
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 804096 READ_COLOR2(color[0][3], src_line[0], x);
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 804096 READ_COLOR2(color[1][3], src_line[1], x);
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 804096 READ_COLOR2(color[2][3], src_line[2], x);
227
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 804096 READ_COLOR2(color[3][3], src_line[3], x);
228 }
229 1407168 x -= 3;
230 }
231 }
232
233 /* We're done with one line, so we shift the source lines up */
234 4032 src_line[0] = src_line[1];
235 4032 src_line[1] = src_line[2];
236 4032 src_line[2] = src_line[3];
237
238 /* Read next line */
239 4032 src_line[3] = src_line[2];
240
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 4032 if (y < height - 3)
241 3990 src_line[3] += src_linesize;
242 } // y loop
243
244 14 return 0;
245 }
246
247 static const enum AVPixelFormat pix_fmts[] = {
248 AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
249 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
250 AV_PIX_FMT_RGB565BE, AV_PIX_FMT_BGR565BE, AV_PIX_FMT_RGB555BE, AV_PIX_FMT_BGR555BE,
251 AV_PIX_FMT_RGB565LE, AV_PIX_FMT_BGR565LE, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_BGR555LE,
252 AV_PIX_FMT_NONE
253 };
254
255 14 static int config_input(AVFilterLink *inlink)
256 {
257 14 Super2xSaIContext *s = inlink->dst->priv;
258
259 14 s->hi_pixel_mask = 0xFEFEFEFE;
260 14 s->lo_pixel_mask = 0x01010101;
261 14 s->q_hi_pixel_mask = 0xFCFCFCFC;
262 14 s->q_lo_pixel_mask = 0x03030303;
263 14 s->bpp = 4;
264
265
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 14 switch (inlink->format) {
266 2 case AV_PIX_FMT_RGB24:
267 case AV_PIX_FMT_BGR24:
268 2 s->bpp = 3;
269 2 break;
270
271 2 case AV_PIX_FMT_RGB565BE:
272 case AV_PIX_FMT_BGR565BE:
273 2 s->is_be = 1;
274 4 case AV_PIX_FMT_RGB565LE:
275 case AV_PIX_FMT_BGR565LE:
276 4 s->hi_pixel_mask = 0xF7DEF7DE;
277 4 s->lo_pixel_mask = 0x08210821;
278 4 s->q_hi_pixel_mask = 0xE79CE79C;
279 4 s->q_lo_pixel_mask = 0x18631863;
280 4 s->bpp = 2;
281 4 break;
282
283 2 case AV_PIX_FMT_BGR555BE:
284 case AV_PIX_FMT_RGB555BE:
285 2 s->is_be = 1;
286 4 case AV_PIX_FMT_BGR555LE:
287 case AV_PIX_FMT_RGB555LE:
288 4 s->hi_pixel_mask = 0x7BDE7BDE;
289 4 s->lo_pixel_mask = 0x04210421;
290 4 s->q_hi_pixel_mask = 0x739C739C;
291 4 s->q_lo_pixel_mask = 0x0C630C63;
292 4 s->bpp = 2;
293 4 break;
294 }
295
296 14 return 0;
297 }
298
299 14 static int config_output(AVFilterLink *outlink)
300 {
301 14 AVFilterLink *inlink = outlink->src->inputs[0];
302
303 14 outlink->w = inlink->w*2;
304 14 outlink->h = inlink->h*2;
305
306 14 av_log(inlink->dst, AV_LOG_VERBOSE, "fmt:%s size:%dx%d -> size:%dx%d\n",
307 14 av_get_pix_fmt_name(inlink->format),
308 inlink->w, inlink->h, outlink->w, outlink->h);
309
310 14 return 0;
311 }
312
313 14 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
314 {
315 14 AVFilterContext *ctx = inlink->dst;
316 14 AVFilterLink *outlink = ctx->outputs[0];
317 ThreadData td;
318 14 AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
319
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 14 if (!out) {
320 ✗ av_frame_free(&in);
321 ✗ return AVERROR(ENOMEM);
322 }
323 14 av_frame_copy_props(out, in);
324 14 out->width = outlink->w;
325 14 out->height = outlink->h;
326
327 14 td.in = in, td.out = out;
328 14 ff_filter_execute(ctx, super2xsai, &td, NULL,
329
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 14 FFMIN(in->height, ff_filter_get_nb_threads(ctx)));
330
331 14 av_frame_free(&in);
332 14 return ff_filter_frame(outlink, out);
333 }
334
335 static const AVFilterPad super2xsai_inputs[] = {
336 {
337 .name = "default",
338 .type = AVMEDIA_TYPE_VIDEO,
339 .config_props = config_input,
340 .filter_frame = filter_frame,
341 },
342 };
343
344 static const AVFilterPad super2xsai_outputs[] = {
345 {
346 .name = "default",
347 .type = AVMEDIA_TYPE_VIDEO,
348 .config_props = config_output,
349 },
350 };
351
352 const FFFilter ff_vf_super2xsai = {
353 .p.name = "super2xsai",
354 .p.description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),
355 .p.flags = AVFILTER_FLAG_SLICE_THREADS,
356 .priv_size = sizeof(Super2xSaIContext),
357 FILTER_INPUTS(super2xsai_inputs),
358 FILTER_OUTPUTS(super2xsai_outputs),
359 FILTER_PIXFMTS_ARRAY(pix_fmts),
360 };
361