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 )
6 * This file is part of FFmpeg.
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.
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.
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.
25 * Super 2xSaI video filter
26 * Ported from MPlayer libmpcodecs/vf_2xsai.c.
29 #include "libavutil/pixdesc.h"
30 #include "libavutil/intreadwrite.h"
36 typedef struct Super2xSaIContext {
37 /* masks used for two pixels interpolation */
38 uint32_t hi_pixel_mask;
39 uint32_t lo_pixel_mask;
41 /* masks used for four pixels interpolation */
42 uint32_t q_hi_pixel_mask;
43 uint32_t q_lo_pixel_mask;
45 int bpp; ///< bytes per pixel, pixel stride for each (packed) pixel
49 #define GET_RESULT(A, B, C, D) ((A != C || A != D) - (B != C || B != D))
51 #define INTERPOLATE(A, B) (((A & hi_pixel_mask) >> 1) + ((B & hi_pixel_mask) >> 1) + (A & B & lo_pixel_mask))
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)
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)
61 Super2xSaIContext *s = ctx->priv;
64 unsigned char *src_line[4];
65 const int bpp = s->bpp;
66 const uint32_t hi_pixel_mask = s->hi_pixel_mask;
67 const uint32_t lo_pixel_mask = s->lo_pixel_mask;
68 const uint32_t q_hi_pixel_mask = s->q_hi_pixel_mask;
69 const uint32_t q_lo_pixel_mask = s->q_lo_pixel_mask;
71 /* Point to the first 4 lines, first line is duplicated */
74 src_line[2] = src + src_linesize*FFMIN(1, height-1);
75 src_line[3] = src + src_linesize*FFMIN(2, height-1);
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 = s->is_be ? AV_RB16(src_line + 2 * off) : AV_RL16(src_line + 2 * off)
81 for (y = 0; y < height; y++) {
84 dst_line[0] = dst + dst_linesize*2*y;
85 dst_line[1] = dst + dst_linesize*(2*y+1);
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);
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);
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);
107 for (x = 0; x < width; x++) {
108 uint32_t product1a, product1b, product2a, product2b;
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]) {
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]);
130 product1b = color[1][2];
132 product1b = color[1][1];
134 product1b = INTERPOLATE(color[1][1], color[1][2]);
136 product2b = product1b;
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]);
143 product2b = INTERPOLATE(color[2][1], color[2][2]);
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]);
150 product1b = INTERPOLATE(color[1][1], color[1][2]);
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]);
158 product2a = color[2][1];
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]);
165 product1a = color[1][1];
167 /* Set the calculated pixels */
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);
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);
183 AV_WB32(dst_line[0] + x * 4, product1a | (product1b << 16));
184 AV_WB32(dst_line[1] + x * 4, product2a | (product2b << 16));
186 AV_WL32(dst_line[0] + x * 4, product1a | (product1b << 16));
187 AV_WL32(dst_line[1] + x * 4, product2a | (product2b << 16));
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];
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);
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);
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);
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];
228 src_line[3] = src_line[2];
230 src_line[3] += src_linesize;
234 static int query_formats(AVFilterContext *ctx)
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,
244 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
246 return AVERROR(ENOMEM);
247 return ff_set_common_formats(ctx, fmts_list);
250 static int config_input(AVFilterLink *inlink)
252 Super2xSaIContext *s = inlink->dst->priv;
254 s->hi_pixel_mask = 0xFEFEFEFE;
255 s->lo_pixel_mask = 0x01010101;
256 s->q_hi_pixel_mask = 0xFCFCFCFC;
257 s->q_lo_pixel_mask = 0x03030303;
260 switch (inlink->format) {
261 case AV_PIX_FMT_RGB24:
262 case AV_PIX_FMT_BGR24:
266 case AV_PIX_FMT_RGB565BE:
267 case AV_PIX_FMT_BGR565BE:
269 case AV_PIX_FMT_RGB565LE:
270 case AV_PIX_FMT_BGR565LE:
271 s->hi_pixel_mask = 0xF7DEF7DE;
272 s->lo_pixel_mask = 0x08210821;
273 s->q_hi_pixel_mask = 0xE79CE79C;
274 s->q_lo_pixel_mask = 0x18631863;
278 case AV_PIX_FMT_BGR555BE:
279 case AV_PIX_FMT_RGB555BE:
281 case AV_PIX_FMT_BGR555LE:
282 case AV_PIX_FMT_RGB555LE:
283 s->hi_pixel_mask = 0x7BDE7BDE;
284 s->lo_pixel_mask = 0x04210421;
285 s->q_hi_pixel_mask = 0x739C739C;
286 s->q_lo_pixel_mask = 0x0C630C63;
294 static int config_output(AVFilterLink *outlink)
296 AVFilterLink *inlink = outlink->src->inputs[0];
298 outlink->w = inlink->w*2;
299 outlink->h = inlink->h*2;
301 av_log(inlink->dst, AV_LOG_VERBOSE, "fmt:%s size:%dx%d -> size:%dx%d\n",
302 av_get_pix_fmt_name(inlink->format),
303 inlink->w, inlink->h, outlink->w, outlink->h);
308 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
310 AVFilterLink *outlink = inlink->dst->outputs[0];
311 AVFrame *outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
313 av_frame_free(&inpicref);
314 return AVERROR(ENOMEM);
316 av_frame_copy_props(outpicref, inpicref);
317 outpicref->width = outlink->w;
318 outpicref->height = outlink->h;
320 super2xsai(inlink->dst, inpicref->data[0], inpicref->linesize[0],
321 outpicref->data[0], outpicref->linesize[0],
322 inlink->w, inlink->h);
324 av_frame_free(&inpicref);
325 return ff_filter_frame(outlink, outpicref);
328 static const AVFilterPad super2xsai_inputs[] = {
331 .type = AVMEDIA_TYPE_VIDEO,
332 .config_props = config_input,
333 .filter_frame = filter_frame,
338 static const AVFilterPad super2xsai_outputs[] = {
341 .type = AVMEDIA_TYPE_VIDEO,
342 .config_props = config_output,
347 AVFilter ff_vf_super2xsai = {
348 .name = "super2xsai",
349 .description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),
350 .priv_size = sizeof(Super2xSaIContext),
351 .query_formats = query_formats,
352 .inputs = super2xsai_inputs,
353 .outputs = super2xsai_outputs,