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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 "formats.h" | |
33 | #include "internal.h" | |
34 | #include "video.h" | |
35 | ||
36 | typedef struct { | |
37 | /* masks used for two pixels interpolation */ | |
38 | uint32_t hi_pixel_mask; | |
39 | uint32_t lo_pixel_mask; | |
40 | ||
41 | /* masks used for four pixels interpolation */ | |
42 | uint32_t q_hi_pixel_mask; | |
43 | uint32_t q_lo_pixel_mask; | |
44 | ||
45 | int bpp; ///< bytes per pixel, pixel stride for each (packed) pixel | |
46 | int is_be; | |
47 | } Super2xSaIContext; | |
48 | ||
49 | #define GET_RESULT(A, B, C, D) ((A != C || A != D) - (B != C || B != D)) | |
50 | ||
51 | #define INTERPOLATE(A, B) (((A & hi_pixel_mask) >> 1) + ((B & hi_pixel_mask) >> 1) + (A & B & lo_pixel_mask)) | |
52 | ||
53 | #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) \ | |
54 | + ((((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) | |
55 | ||
56 | static void super2xsai(AVFilterContext *ctx, | |
57 | uint8_t *src, int src_linesize, | |
58 | uint8_t *dst, int dst_linesize, | |
59 | int width, int height) | |
60 | { | |
61 | Super2xSaIContext *sai = ctx->priv; | |
62 | unsigned int x, y; | |
63 | uint32_t color[4][4]; | |
64 | unsigned char *src_line[4]; | |
65 | const int bpp = sai->bpp; | |
66 | const uint32_t hi_pixel_mask = sai->hi_pixel_mask; | |
67 | const uint32_t lo_pixel_mask = sai->lo_pixel_mask; | |
68 | const uint32_t q_hi_pixel_mask = sai->q_hi_pixel_mask; | |
69 | const uint32_t q_lo_pixel_mask = sai->q_lo_pixel_mask; | |
70 | ||
71 | /* Point to the first 4 lines, first line is duplicated */ | |
72 | src_line[0] = src; | |
73 | src_line[1] = src; | |
74 | src_line[2] = src + src_linesize*FFMIN(1, height-1); | |
75 | src_line[3] = src + src_linesize*FFMIN(2, height-1); | |
76 | ||
77 | #define READ_COLOR4(dst, src_line, off) dst = *((const uint32_t *)src_line + off) | |
78 | #define READ_COLOR3(dst, src_line, off) dst = AV_RL24 (src_line + 3*off) | |
79 | #define READ_COLOR2(dst, src_line, off) dst = sai->is_be ? AV_RB16(src_line + 2 * off) : AV_RL16(src_line + 2 * off) | |
80 | ||
81 | for (y = 0; y < height; y++) { | |
82 | uint8_t *dst_line[2]; | |
83 | ||
84 | dst_line[0] = dst + dst_linesize*2*y; | |
85 | dst_line[1] = dst + dst_linesize*(2*y+1); | |
86 | ||
87 | switch (bpp) { | |
88 | case 4: | |
89 | 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); | |
90 | 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); | |
91 | 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); | |
92 | 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); | |
93 | break; | |
94 | case 3: | |
95 | 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); | |
96 | 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); | |
97 | 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); | |
98 | 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); | |
99 | break; | |
100 | default: | |
101 | 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); | |
102 | 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); | |
103 | 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); | |
104 | 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); | |
105 | } | |
106 | ||
107 | for (x = 0; x < width; x++) { | |
108 | uint32_t product1a, product1b, product2a, product2b; | |
109 | ||
110 | //--------------------------------------- B0 B1 B2 B3 0 1 2 3 | |
111 | // 4 5* 6 S2 -> 4 5* 6 7 | |
112 | // 1 2 3 S1 8 9 10 11 | |
113 | // A0 A1 A2 A3 12 13 14 15 | |
114 | //-------------------------------------- | |
115 | if (color[2][1] == color[1][2] && color[1][1] != color[2][2]) { | |
116 | product2b = color[2][1]; | |
117 | product1b = product2b; | |
118 | } else if (color[1][1] == color[2][2] && color[2][1] != color[1][2]) { | |
119 | product2b = color[1][1]; | |
120 | product1b = product2b; | |
121 | } else if (color[1][1] == color[2][2] && color[2][1] == color[1][2]) { | |
122 | int r = 0; | |
123 | ||
124 | r += GET_RESULT(color[1][2], color[1][1], color[1][0], color[3][1]); | |
125 | r += GET_RESULT(color[1][2], color[1][1], color[2][0], color[0][1]); | |
126 | r += GET_RESULT(color[1][2], color[1][1], color[3][2], color[2][3]); | |
127 | r += GET_RESULT(color[1][2], color[1][1], color[0][2], color[1][3]); | |
128 | ||
129 | if (r > 0) | |
130 | product1b = color[1][2]; | |
131 | else if (r < 0) | |
132 | product1b = color[1][1]; | |
133 | else | |
134 | product1b = INTERPOLATE(color[1][1], color[1][2]); | |
135 | ||
136 | product2b = product1b; | |
137 | } else { | |
138 | 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]) | |
139 | product2b = Q_INTERPOLATE(color[2][2], color[2][2], color[2][2], color[2][1]); | |
140 | 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]) | |
141 | product2b = Q_INTERPOLATE(color[2][1], color[2][1], color[2][1], color[2][2]); | |
142 | else | |
143 | product2b = INTERPOLATE(color[2][1], color[2][2]); | |
144 | ||
145 | 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]) | |
146 | product1b = Q_INTERPOLATE(color[1][2], color[1][2], color[1][2], color[1][1]); | |
147 | 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]) | |
148 | product1b = Q_INTERPOLATE(color[1][2], color[1][1], color[1][1], color[1][1]); | |
149 | else | |
150 | product1b = INTERPOLATE(color[1][1], color[1][2]); | |
151 | } | |
152 | ||
153 | 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]) | |
154 | product2a = INTERPOLATE(color[2][1], color[1][1]); | |
155 | 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]) | |
156 | product2a = INTERPOLATE(color[2][1], color[1][1]); | |
157 | else | |
158 | product2a = color[2][1]; | |
159 | ||
160 | 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]) | |
161 | product1a = INTERPOLATE(color[2][1], color[1][1]); | |
162 | 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]) | |
163 | product1a = INTERPOLATE(color[2][1], color[1][1]); | |
164 | else | |
165 | product1a = color[1][1]; | |
166 | ||
167 | /* Set the calculated pixels */ | |
168 | switch (bpp) { | |
169 | case 4: | |
170 | AV_WN32A(dst_line[0] + x * 8, product1a); | |
171 | AV_WN32A(dst_line[0] + x * 8 + 4, product1b); | |
172 | AV_WN32A(dst_line[1] + x * 8, product2a); | |
173 | AV_WN32A(dst_line[1] + x * 8 + 4, product2b); | |
174 | break; | |
175 | case 3: | |
176 | AV_WL24(dst_line[0] + x * 6, product1a); | |
177 | AV_WL24(dst_line[0] + x * 6 + 3, product1b); | |
178 | AV_WL24(dst_line[1] + x * 6, product2a); | |
179 | AV_WL24(dst_line[1] + x * 6 + 3, product2b); | |
180 | break; | |
181 | default: // bpp = 2 | |
182 | if (sai->is_be) { | |
183 | AV_WB32(dst_line[0] + x * 4, product1a | (product1b << 16)); | |
184 | AV_WB32(dst_line[1] + x * 4, product2a | (product2b << 16)); | |
185 | } else { | |
186 | AV_WL32(dst_line[0] + x * 4, product1a | (product1b << 16)); | |
187 | AV_WL32(dst_line[1] + x * 4, product2a | (product2b << 16)); | |
188 | } | |
189 | } | |
190 | ||
191 | /* Move color matrix forward */ | |
192 | color[0][0] = color[0][1]; color[0][1] = color[0][2]; color[0][2] = color[0][3]; | |
193 | color[1][0] = color[1][1]; color[1][1] = color[1][2]; color[1][2] = color[1][3]; | |
194 | color[2][0] = color[2][1]; color[2][1] = color[2][2]; color[2][2] = color[2][3]; | |
195 | color[3][0] = color[3][1]; color[3][1] = color[3][2]; color[3][2] = color[3][3]; | |
196 | ||
197 | if (x < width - 3) { | |
198 | x += 3; | |
199 | switch (bpp) { | |
200 | case 4: | |
201 | READ_COLOR4(color[0][3], src_line[0], x); | |
202 | READ_COLOR4(color[1][3], src_line[1], x); | |
203 | READ_COLOR4(color[2][3], src_line[2], x); | |
204 | READ_COLOR4(color[3][3], src_line[3], x); | |
205 | break; | |
206 | case 3: | |
207 | READ_COLOR3(color[0][3], src_line[0], x); | |
208 | READ_COLOR3(color[1][3], src_line[1], x); | |
209 | READ_COLOR3(color[2][3], src_line[2], x); | |
210 | READ_COLOR3(color[3][3], src_line[3], x); | |
211 | break; | |
212 | default: /* case 2 */ | |
213 | READ_COLOR2(color[0][3], src_line[0], x); | |
214 | READ_COLOR2(color[1][3], src_line[1], x); | |
215 | READ_COLOR2(color[2][3], src_line[2], x); | |
216 | READ_COLOR2(color[3][3], src_line[3], x); | |
217 | } | |
218 | x -= 3; | |
219 | } | |
220 | } | |
221 | ||
222 | /* We're done with one line, so we shift the source lines up */ | |
223 | src_line[0] = src_line[1]; | |
224 | src_line[1] = src_line[2]; | |
225 | src_line[2] = src_line[3]; | |
226 | ||
227 | /* Read next line */ | |
228 | src_line[3] = src_line[2]; | |
229 | if (y < height - 3) | |
230 | src_line[3] += src_linesize; | |
231 | } // y loop | |
232 | } | |
233 | ||
234 | static int query_formats(AVFilterContext *ctx) | |
235 | { | |
236 | static const enum AVPixelFormat pix_fmts[] = { | |
237 | AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, | |
238 | AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, | |
239 | AV_PIX_FMT_RGB565BE, AV_PIX_FMT_BGR565BE, AV_PIX_FMT_RGB555BE, AV_PIX_FMT_BGR555BE, | |
240 | AV_PIX_FMT_RGB565LE, AV_PIX_FMT_BGR565LE, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_BGR555LE, | |
241 | AV_PIX_FMT_NONE | |
242 | }; | |
243 | ||
244 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int config_input(AVFilterLink *inlink) | |
249 | { | |
250 | Super2xSaIContext *sai = inlink->dst->priv; | |
251 | ||
252 | sai->hi_pixel_mask = 0xFEFEFEFE; | |
253 | sai->lo_pixel_mask = 0x01010101; | |
254 | sai->q_hi_pixel_mask = 0xFCFCFCFC; | |
255 | sai->q_lo_pixel_mask = 0x03030303; | |
256 | sai->bpp = 4; | |
257 | ||
258 | switch (inlink->format) { | |
259 | case AV_PIX_FMT_RGB24: | |
260 | case AV_PIX_FMT_BGR24: | |
261 | sai->bpp = 3; | |
262 | break; | |
263 | ||
264 | case AV_PIX_FMT_RGB565BE: | |
265 | case AV_PIX_FMT_BGR565BE: | |
266 | sai->is_be = 1; | |
267 | case AV_PIX_FMT_RGB565LE: | |
268 | case AV_PIX_FMT_BGR565LE: | |
269 | sai->hi_pixel_mask = 0xF7DEF7DE; | |
270 | sai->lo_pixel_mask = 0x08210821; | |
271 | sai->q_hi_pixel_mask = 0xE79CE79C; | |
272 | sai->q_lo_pixel_mask = 0x18631863; | |
273 | sai->bpp = 2; | |
274 | break; | |
275 | ||
276 | case AV_PIX_FMT_BGR555BE: | |
277 | case AV_PIX_FMT_RGB555BE: | |
278 | sai->is_be = 1; | |
279 | case AV_PIX_FMT_BGR555LE: | |
280 | case AV_PIX_FMT_RGB555LE: | |
281 | sai->hi_pixel_mask = 0x7BDE7BDE; | |
282 | sai->lo_pixel_mask = 0x04210421; | |
283 | sai->q_hi_pixel_mask = 0x739C739C; | |
284 | sai->q_lo_pixel_mask = 0x0C630C63; | |
285 | sai->bpp = 2; | |
286 | break; | |
287 | } | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | static int config_output(AVFilterLink *outlink) | |
293 | { | |
294 | AVFilterLink *inlink = outlink->src->inputs[0]; | |
295 | ||
296 | outlink->w = inlink->w*2; | |
297 | outlink->h = inlink->h*2; | |
298 | ||
299 | av_log(inlink->dst, AV_LOG_VERBOSE, "fmt:%s size:%dx%d -> size:%dx%d\n", | |
300 | av_get_pix_fmt_name(inlink->format), | |
301 | inlink->w, inlink->h, outlink->w, outlink->h); | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) | |
307 | { | |
308 | AVFilterLink *outlink = inlink->dst->outputs[0]; | |
309 | AVFrame *outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h); | |
310 | if (!outpicref) { | |
311 | av_frame_free(&inpicref); | |
312 | return AVERROR(ENOMEM); | |
313 | } | |
314 | av_frame_copy_props(outpicref, inpicref); | |
315 | outpicref->width = outlink->w; | |
316 | outpicref->height = outlink->h; | |
317 | ||
318 | super2xsai(inlink->dst, inpicref->data[0], inpicref->linesize[0], | |
319 | outpicref->data[0], outpicref->linesize[0], | |
320 | inlink->w, inlink->h); | |
321 | ||
322 | av_frame_free(&inpicref); | |
323 | return ff_filter_frame(outlink, outpicref); | |
324 | } | |
325 | ||
326 | static const AVFilterPad super2xsai_inputs[] = { | |
327 | { | |
328 | .name = "default", | |
329 | .type = AVMEDIA_TYPE_VIDEO, | |
330 | .config_props = config_input, | |
331 | .filter_frame = filter_frame, | |
332 | }, | |
333 | { NULL } | |
334 | }; | |
335 | ||
336 | static const AVFilterPad super2xsai_outputs[] = { | |
337 | { | |
338 | .name = "default", | |
339 | .type = AVMEDIA_TYPE_VIDEO, | |
340 | .config_props = config_output, | |
341 | }, | |
342 | { NULL } | |
343 | }; | |
344 | ||
345 | AVFilter ff_vf_super2xsai = { | |
346 | .name = "super2xsai", | |
347 | .description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."), | |
348 | .priv_size = sizeof(Super2xSaIContext), | |
349 | .query_formats = query_formats, | |
350 | .inputs = super2xsai_inputs, | |
351 | .outputs = super2xsai_outputs, | |
352 | }; |