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vf_super2xsai.c
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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, AVFilterBufferRef *inpicref)
307 {
308  AVFilterLink *outlink = inlink->dst->outputs[0];
309  AVFilterBufferRef *outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
310  if (!outpicref) {
311  avfilter_unref_bufferp(&inpicref);
312  return AVERROR(ENOMEM);
313  }
314  avfilter_copy_buffer_ref_props(outpicref, inpicref);
315  outpicref->video->w = outlink->w;
316  outpicref->video->h = 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  avfilter_unref_bufferp(&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  .min_perms = AV_PERM_READ,
333  },
334  { NULL }
335 };
336 
337 static const AVFilterPad super2xsai_outputs[] = {
338  {
339  .name = "default",
340  .type = AVMEDIA_TYPE_VIDEO,
341  .config_props = config_output,
342  },
343  { NULL }
344 };
345 
346 AVFilter avfilter_vf_super2xsai = {
347  .name = "super2xsai",
348  .description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),
349  .priv_size = sizeof(Super2xSaIContext),
350  .query_formats = query_formats,
351  .inputs = super2xsai_inputs,
352  .outputs = super2xsai_outputs,
353 };
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