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vf_fieldmatch.c
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1 /*
2  * Copyright (c) 2012 Fredrik Mellbin
3  * Copyright (c) 2013 Clément Bœsch
4  *
5  * This file is part of FFmpeg.
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  * Fieldmatching filter, ported from VFM filter (VapourSynth) by Clément.
25  * Fredrik Mellbin is the author of the VIVTC/VFM filter, which is itself a
26  * light clone of the TIVTC/TFM (AviSynth) filter written by Kevin Stone
27  * (tritical), the original author.
28  *
29  * @see http://bengal.missouri.edu/~kes25c/
30  * @see http://www.vapoursynth.com/about/
31  */
32 
33 #include <inttypes.h>
34 
35 #include "libavutil/avassert.h"
36 #include "libavutil/imgutils.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/timestamp.h"
39 #include "avfilter.h"
40 #include "internal.h"
41 
42 #define INPUT_MAIN 0
43 #define INPUT_CLEANSRC 1
44 
49 };
50 
59 };
60 
66 };
67 
68 enum comb_dbg {
73 };
74 
75 typedef struct {
76  const AVClass *class;
77 
78  AVFrame *prv, *src, *nxt; ///< main sliding window of 3 frames
79  AVFrame *prv2, *src2, *nxt2; ///< sliding window of the optional second stream
80  int got_frame[2]; ///< frame request flag for each input stream
81  int hsub, vsub; ///< chroma subsampling values
82  uint32_t eof; ///< bitmask for end of stream
83  int64_t lastscdiff;
84  int64_t lastn;
85 
86  /* options */
87  int order;
88  int ppsrc;
90  int field;
91  int mchroma;
92  int y0, y1;
93  int64_t scthresh;
94  double scthresh_flt;
96  int combdbg;
97  int cthresh;
98  int chroma;
99  int blockx, blocky;
100  int combpel;
101 
102  /* misc buffers */
103  uint8_t *map_data[4];
104  int map_linesize[4];
105  uint8_t *cmask_data[4];
106  int cmask_linesize[4];
107  int *c_array;
108  int tpitchy, tpitchuv;
111 
112 #define OFFSET(x) offsetof(FieldMatchContext, x)
113 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
114 
115 static const AVOption fieldmatch_options[] = {
116  { "order", "specify the assumed field order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=FM_PARITY_AUTO}, -1, 1, FLAGS, "order" },
117  { "auto", "auto detect parity", 0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_AUTO}, INT_MIN, INT_MAX, FLAGS, "order" },
118  { "bff", "assume bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "order" },
119  { "tff", "assume top field first", 0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_TOP}, INT_MIN, INT_MAX, FLAGS, "order" },
120  { "mode", "set the matching mode or strategy to use", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_PC_N}, MODE_PC, NB_MODE-1, FLAGS, "mode" },
121  { "pc", "2-way match (p/c)", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PC}, INT_MIN, INT_MAX, FLAGS, "mode" },
122  { "pc_n", "2-way match + 3rd match on combed (p/c + u)", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PC_N}, INT_MIN, INT_MAX, FLAGS, "mode" },
123  { "pc_u", "2-way match + 3rd match (same order) on combed (p/c + u)", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PC_U}, INT_MIN, INT_MAX, FLAGS, "mode" },
124  { "pc_n_ub", "2-way match + 3rd match on combed + 4th/5th matches if still combed (p/c + u + u/b)", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PC_N_UB}, INT_MIN, INT_MAX, FLAGS, "mode" },
125  { "pcn", "3-way match (p/c/n)", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PCN}, INT_MIN, INT_MAX, FLAGS, "mode" },
126  { "pcn_ub", "3-way match + 4th/5th matches on combed (p/c/n + u/b)", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PCN_UB}, INT_MIN, INT_MAX, FLAGS, "mode" },
127  { "ppsrc", "mark main input as a pre-processed input and activate clean source input stream", OFFSET(ppsrc), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
128  { "field", "set the field to match from", OFFSET(field), AV_OPT_TYPE_INT, {.i64=FM_PARITY_AUTO}, -1, 1, FLAGS, "field" },
129  { "auto", "automatic (same value as 'order')", 0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_AUTO}, INT_MIN, INT_MAX, FLAGS, "field" },
130  { "bottom", "bottom field", 0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "field" },
131  { "top", "top field", 0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_TOP}, INT_MIN, INT_MAX, FLAGS, "field" },
132  { "mchroma", "set whether or not chroma is included during the match comparisons", OFFSET(mchroma), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
133  { "y0", "define an exclusion band which excludes the lines between y0 and y1 from the field matching decision", OFFSET(y0), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
134  { "y1", "define an exclusion band which excludes the lines between y0 and y1 from the field matching decision", OFFSET(y1), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
135  { "scthresh", "set scene change detection threshold", OFFSET(scthresh_flt), AV_OPT_TYPE_DOUBLE, {.dbl=12}, 0, 100, FLAGS },
136  { "combmatch", "set combmatching mode", OFFSET(combmatch), AV_OPT_TYPE_INT, {.i64=COMBMATCH_SC}, COMBMATCH_NONE, NB_COMBMATCH-1, FLAGS, "combmatching" },
137  { "none", "disable combmatching", 0, AV_OPT_TYPE_CONST, {.i64=COMBMATCH_NONE}, INT_MIN, INT_MAX, FLAGS, "combmatching" },
138  { "sc", "enable combmatching only on scene change", 0, AV_OPT_TYPE_CONST, {.i64=COMBMATCH_SC}, INT_MIN, INT_MAX, FLAGS, "combmatching" },
139  { "full", "enable combmatching all the time", 0, AV_OPT_TYPE_CONST, {.i64=COMBMATCH_FULL}, INT_MIN, INT_MAX, FLAGS, "combmatching" },
140  { "combdbg", "enable comb debug", OFFSET(combdbg), AV_OPT_TYPE_INT, {.i64=COMBDBG_NONE}, COMBDBG_NONE, NB_COMBDBG-1, FLAGS, "dbglvl" },
141  { "none", "no forced calculation", 0, AV_OPT_TYPE_CONST, {.i64=COMBDBG_NONE}, INT_MIN, INT_MAX, FLAGS, "dbglvl" },
142  { "pcn", "calculate p/c/n", 0, AV_OPT_TYPE_CONST, {.i64=COMBDBG_PCN}, INT_MIN, INT_MAX, FLAGS, "dbglvl" },
143  { "pcnub", "calculate p/c/n/u/b", 0, AV_OPT_TYPE_CONST, {.i64=COMBDBG_PCNUB}, INT_MIN, INT_MAX, FLAGS, "dbglvl" },
144  { "cthresh", "set the area combing threshold used for combed frame detection", OFFSET(cthresh), AV_OPT_TYPE_INT, {.i64= 9}, -1, 0xff, FLAGS },
145  { "chroma", "set whether or not chroma is considered in the combed frame decision", OFFSET(chroma), AV_OPT_TYPE_INT, {.i64= 0}, 0, 1, FLAGS },
146  { "blockx", "set the x-axis size of the window used during combed frame detection", OFFSET(blockx), AV_OPT_TYPE_INT, {.i64=16}, 4, 1<<9, FLAGS },
147  { "blocky", "set the y-axis size of the window used during combed frame detection", OFFSET(blocky), AV_OPT_TYPE_INT, {.i64=16}, 4, 1<<9, FLAGS },
148  { "combpel", "set the number of combed pixels inside any of the blocky by blockx size blocks on the frame for the frame to be detected as combed", OFFSET(combpel), AV_OPT_TYPE_INT, {.i64=80}, 0, INT_MAX, FLAGS },
149  { NULL }
150 };
151 
152 AVFILTER_DEFINE_CLASS(fieldmatch);
153 
154 static int get_width(const FieldMatchContext *fm, const AVFrame *f, int plane)
155 {
156  return plane ? FF_CEIL_RSHIFT(f->width, fm->hsub) : f->width;
157 }
158 
159 static int get_height(const FieldMatchContext *fm, const AVFrame *f, int plane)
160 {
161  return plane ? FF_CEIL_RSHIFT(f->height, fm->vsub) : f->height;
162 }
163 
164 static int64_t luma_abs_diff(const AVFrame *f1, const AVFrame *f2)
165 {
166  int x, y;
167  const uint8_t *srcp1 = f1->data[0];
168  const uint8_t *srcp2 = f2->data[0];
169  const int src1_linesize = f1->linesize[0];
170  const int src2_linesize = f2->linesize[0];
171  const int width = f1->width;
172  const int height = f1->height;
173  int64_t acc = 0;
174 
175  for (y = 0; y < height; y++) {
176  for (x = 0; x < width; x++)
177  acc += abs(srcp1[x] - srcp2[x]);
178  srcp1 += src1_linesize;
179  srcp2 += src2_linesize;
180  }
181  return acc;
182 }
183 
184 static void fill_buf(uint8_t *data, int w, int h, int linesize, uint8_t v)
185 {
186  int y;
187 
188  for (y = 0; y < h; y++) {
189  memset(data, v, w);
190  data += linesize;
191  }
192 }
193 
194 static int calc_combed_score(const FieldMatchContext *fm, const AVFrame *src)
195 {
196  int x, y, plane, max_v = 0;
197  const int cthresh = fm->cthresh;
198  const int cthresh6 = cthresh * 6;
199 
200  for (plane = 0; plane < (fm->chroma ? 3 : 1); plane++) {
201  const uint8_t *srcp = src->data[plane];
202  const int src_linesize = src->linesize[plane];
203  const int width = get_width (fm, src, plane);
204  const int height = get_height(fm, src, plane);
205  uint8_t *cmkp = fm->cmask_data[plane];
206  const int cmk_linesize = fm->cmask_linesize[plane];
207 
208  if (cthresh < 0) {
209  fill_buf(cmkp, width, height, cmk_linesize, 0xff);
210  continue;
211  }
212  fill_buf(cmkp, width, height, cmk_linesize, 0);
213 
214  /* [1 -3 4 -3 1] vertical filter */
215 #define FILTER(xm2, xm1, xp1, xp2) \
216  abs( 4 * srcp[x] \
217  -3 * (srcp[x + (xm1)*src_linesize] + srcp[x + (xp1)*src_linesize]) \
218  + (srcp[x + (xm2)*src_linesize] + srcp[x + (xp2)*src_linesize])) > cthresh6
219 
220  /* first line */
221  for (x = 0; x < width; x++) {
222  const int s1 = abs(srcp[x] - srcp[x + src_linesize]);
223  if (s1 > cthresh && FILTER(2, 1, 1, 2))
224  cmkp[x] = 0xff;
225  }
226  srcp += src_linesize;
227  cmkp += cmk_linesize;
228 
229  /* second line */
230  for (x = 0; x < width; x++) {
231  const int s1 = abs(srcp[x] - srcp[x - src_linesize]);
232  const int s2 = abs(srcp[x] - srcp[x + src_linesize]);
233  if (s1 > cthresh && s2 > cthresh && FILTER(2, -1, 1, 2))
234  cmkp[x] = 0xff;
235  }
236  srcp += src_linesize;
237  cmkp += cmk_linesize;
238 
239  /* all lines minus first two and last two */
240  for (y = 2; y < height-2; y++) {
241  for (x = 0; x < width; x++) {
242  const int s1 = abs(srcp[x] - srcp[x - src_linesize]);
243  const int s2 = abs(srcp[x] - srcp[x + src_linesize]);
244  if (s1 > cthresh && s2 > cthresh && FILTER(-2, -1, 1, 2))
245  cmkp[x] = 0xff;
246  }
247  srcp += src_linesize;
248  cmkp += cmk_linesize;
249  }
250 
251  /* before-last line */
252  for (x = 0; x < width; x++) {
253  const int s1 = abs(srcp[x] - srcp[x - src_linesize]);
254  const int s2 = abs(srcp[x] - srcp[x + src_linesize]);
255  if (s1 > cthresh && s2 > cthresh && FILTER(-2, -1, 1, -2))
256  cmkp[x] = 0xff;
257  }
258  srcp += src_linesize;
259  cmkp += cmk_linesize;
260 
261  /* last line */
262  for (x = 0; x < width; x++) {
263  const int s1 = abs(srcp[x] - srcp[x - src_linesize]);
264  if (s1 > cthresh && FILTER(-2, -1, -1, -2))
265  cmkp[x] = 0xff;
266  }
267  }
268 
269  if (fm->chroma) {
270  uint8_t *cmkp = fm->cmask_data[0];
271  uint8_t *cmkpU = fm->cmask_data[1];
272  uint8_t *cmkpV = fm->cmask_data[2];
273  const int width = FF_CEIL_RSHIFT(src->width, fm->hsub);
274  const int height = FF_CEIL_RSHIFT(src->height, fm->vsub);
275  const int cmk_linesize = fm->cmask_linesize[0] << 1;
276  const int cmk_linesizeUV = fm->cmask_linesize[2];
277  uint8_t *cmkpp = cmkp - (cmk_linesize>>1);
278  uint8_t *cmkpn = cmkp + (cmk_linesize>>1);
279  uint8_t *cmkpnn = cmkp + cmk_linesize;
280  for (y = 1; y < height - 1; y++) {
281  cmkpp += cmk_linesize;
282  cmkp += cmk_linesize;
283  cmkpn += cmk_linesize;
284  cmkpnn += cmk_linesize;
285  cmkpV += cmk_linesizeUV;
286  cmkpU += cmk_linesizeUV;
287  for (x = 1; x < width - 1; x++) {
288 #define HAS_FF_AROUND(p, lz) (p[x-1 - lz] == 0xff || p[x - lz] == 0xff || p[x+1 - lz] == 0xff || \
289  p[x-1 ] == 0xff || p[x+1 ] == 0xff || \
290  p[x-1 + lz] == 0xff || p[x + lz] == 0xff || p[x+1 + lz] == 0xff)
291  if ((cmkpV[x] == 0xff && HAS_FF_AROUND(cmkpV, cmk_linesizeUV)) ||
292  (cmkpU[x] == 0xff && HAS_FF_AROUND(cmkpU, cmk_linesizeUV))) {
293  ((uint16_t*)cmkp)[x] = 0xffff;
294  ((uint16_t*)cmkpn)[x] = 0xffff;
295  if (y&1) ((uint16_t*)cmkpp)[x] = 0xffff;
296  else ((uint16_t*)cmkpnn)[x] = 0xffff;
297  }
298  }
299  }
300  }
301 
302  {
303  const int blockx = fm->blockx;
304  const int blocky = fm->blocky;
305  const int xhalf = blockx/2;
306  const int yhalf = blocky/2;
307  const int cmk_linesize = fm->cmask_linesize[0];
308  const uint8_t *cmkp = fm->cmask_data[0] + cmk_linesize;
309  const int width = src->width;
310  const int height = src->height;
311  const int xblocks = ((width+xhalf)/blockx) + 1;
312  const int xblocks4 = xblocks<<2;
313  const int yblocks = ((height+yhalf)/blocky) + 1;
314  int *c_array = fm->c_array;
315  const int arraysize = (xblocks*yblocks)<<2;
316  int heighta = (height/(blocky/2))*(blocky/2);
317  const int widtha = (width /(blockx/2))*(blockx/2);
318  if (heighta == height)
319  heighta = height - yhalf;
320  memset(c_array, 0, arraysize * sizeof(*c_array));
321 
322 #define C_ARRAY_ADD(v) do { \
323  const int box1 = (x / blockx) * 4; \
324  const int box2 = ((x + xhalf) / blockx) * 4; \
325  c_array[temp1 + box1 ] += v; \
326  c_array[temp1 + box2 + 1] += v; \
327  c_array[temp2 + box1 + 2] += v; \
328  c_array[temp2 + box2 + 3] += v; \
329 } while (0)
330 
331 #define VERTICAL_HALF(y_start, y_end) do { \
332  for (y = y_start; y < y_end; y++) { \
333  const int temp1 = (y / blocky) * xblocks4; \
334  const int temp2 = ((y + yhalf) / blocky) * xblocks4; \
335  for (x = 0; x < width; x++) \
336  if (cmkp[x - cmk_linesize] == 0xff && \
337  cmkp[x ] == 0xff && \
338  cmkp[x + cmk_linesize] == 0xff) \
339  C_ARRAY_ADD(1); \
340  cmkp += cmk_linesize; \
341  } \
342 } while (0)
343 
344  VERTICAL_HALF(1, yhalf);
345 
346  for (y = yhalf; y < heighta; y += yhalf) {
347  const int temp1 = (y / blocky) * xblocks4;
348  const int temp2 = ((y + yhalf) / blocky) * xblocks4;
349 
350  for (x = 0; x < widtha; x += xhalf) {
351  const uint8_t *cmkp_tmp = cmkp + x;
352  int u, v, sum = 0;
353  for (u = 0; u < yhalf; u++) {
354  for (v = 0; v < xhalf; v++)
355  if (cmkp_tmp[v - cmk_linesize] == 0xff &&
356  cmkp_tmp[v ] == 0xff &&
357  cmkp_tmp[v + cmk_linesize] == 0xff)
358  sum++;
359  cmkp_tmp += cmk_linesize;
360  }
361  if (sum)
362  C_ARRAY_ADD(sum);
363  }
364 
365  for (x = widtha; x < width; x++) {
366  const uint8_t *cmkp_tmp = cmkp + x;
367  int u, sum = 0;
368  for (u = 0; u < yhalf; u++) {
369  if (cmkp_tmp[-cmk_linesize] == 0xff &&
370  cmkp_tmp[ 0] == 0xff &&
371  cmkp_tmp[ cmk_linesize] == 0xff)
372  sum++;
373  cmkp_tmp += cmk_linesize;
374  }
375  if (sum)
376  C_ARRAY_ADD(sum);
377  }
378 
379  cmkp += cmk_linesize * yhalf;
380  }
381 
382  VERTICAL_HALF(heighta, height - 1);
383 
384  for (x = 0; x < arraysize; x++)
385  if (c_array[x] > max_v)
386  max_v = c_array[x];
387  }
388  return max_v;
389 }
390 
391 // the secret is that tbuffer is an interlaced, offset subset of all the lines
392 static void build_abs_diff_mask(const uint8_t *prvp, int prv_linesize,
393  const uint8_t *nxtp, int nxt_linesize,
394  uint8_t *tbuffer, int tbuf_linesize,
395  int width, int height)
396 {
397  int y, x;
398 
399  prvp -= prv_linesize;
400  nxtp -= nxt_linesize;
401  for (y = 0; y < height; y++) {
402  for (x = 0; x < width; x++)
403  tbuffer[x] = FFABS(prvp[x] - nxtp[x]);
404  prvp += prv_linesize;
405  nxtp += nxt_linesize;
406  tbuffer += tbuf_linesize;
407  }
408 }
409 
410 /**
411  * Build a map over which pixels differ a lot/a little
412  */
414  const uint8_t *prvp, int prv_linesize,
415  const uint8_t *nxtp, int nxt_linesize,
416  uint8_t *dstp, int dst_linesize, int height,
417  int width, int plane)
418 {
419  int x, y, u, diff, count;
420  int tpitch = plane ? fm->tpitchuv : fm->tpitchy;
421  const uint8_t *dp = fm->tbuffer + tpitch;
422 
423  build_abs_diff_mask(prvp, prv_linesize, nxtp, nxt_linesize,
424  fm->tbuffer, tpitch, width, height>>1);
425 
426  for (y = 2; y < height - 2; y += 2) {
427  for (x = 1; x < width - 1; x++) {
428  diff = dp[x];
429  if (diff > 3) {
430  for (count = 0, u = x-1; u < x+2 && count < 2; u++) {
431  count += dp[u-tpitch] > 3;
432  count += dp[u ] > 3;
433  count += dp[u+tpitch] > 3;
434  }
435  if (count > 1) {
436  dstp[x] = 1;
437  if (diff > 19) {
438  int upper = 0, lower = 0;
439  for (count = 0, u = x-1; u < x+2 && count < 6; u++) {
440  if (dp[u-tpitch] > 19) { count++; upper = 1; }
441  if (dp[u ] > 19) count++;
442  if (dp[u+tpitch] > 19) { count++; lower = 1; }
443  }
444  if (count > 3) {
445  if (upper && lower) {
446  dstp[x] |= 1<<1;
447  } else {
448  int upper2 = 0, lower2 = 0;
449  for (u = FFMAX(x-4,0); u < FFMIN(x+5,width); u++) {
450  if (y != 2 && dp[u-2*tpitch] > 19) upper2 = 1;
451  if ( dp[u- tpitch] > 19) upper = 1;
452  if ( dp[u+ tpitch] > 19) lower = 1;
453  if (y != height-4 && dp[u+2*tpitch] > 19) lower2 = 1;
454  }
455  if ((upper && (lower || upper2)) ||
456  (lower && (upper || lower2)))
457  dstp[x] |= 1<<1;
458  else if (count > 5)
459  dstp[x] |= 1<<2;
460  }
461  }
462  }
463  }
464  }
465  }
466  dp += tpitch;
467  dstp += dst_linesize;
468  }
469 }
470 
471 enum { mP, mC, mN, mB, mU };
472 
473 static int get_field_base(int match, int field)
474 {
475  return match < 3 ? 2 - field : 1 + field;
476 }
477 
478 static AVFrame *select_frame(FieldMatchContext *fm, int match)
479 {
480  if (match == mP || match == mB) return fm->prv;
481  else if (match == mN || match == mU) return fm->nxt;
482  else /* match == mC */ return fm->src;
483 }
484 
485 static int compare_fields(FieldMatchContext *fm, int match1, int match2, int field)
486 {
487  int plane, ret;
488  uint64_t accumPc = 0, accumPm = 0, accumPml = 0;
489  uint64_t accumNc = 0, accumNm = 0, accumNml = 0;
490  int norm1, norm2, mtn1, mtn2;
491  float c1, c2, mr;
492  const AVFrame *src = fm->src;
493 
494  for (plane = 0; plane < (fm->mchroma ? 3 : 1); plane++) {
495  int x, y, temp1, temp2, fbase;
496  const AVFrame *prev, *next;
497  uint8_t *mapp = fm->map_data[plane];
498  int map_linesize = fm->map_linesize[plane];
499  const uint8_t *srcp = src->data[plane];
500  const int src_linesize = src->linesize[plane];
501  const int srcf_linesize = src_linesize << 1;
502  int prv_linesize, nxt_linesize;
503  int prvf_linesize, nxtf_linesize;
504  const int width = get_width (fm, src, plane);
505  const int height = get_height(fm, src, plane);
506  const int y0a = fm->y0 >> (plane != 0);
507  const int y1a = fm->y1 >> (plane != 0);
508  const int startx = (plane == 0 ? 8 : 4);
509  const int stopx = width - startx;
510  const uint8_t *srcpf, *srcf, *srcnf;
511  const uint8_t *prvpf, *prvnf, *nxtpf, *nxtnf;
512 
513  fill_buf(mapp, width, height, map_linesize, 0);
514 
515  /* match1 */
516  fbase = get_field_base(match1, field);
517  srcf = srcp + (fbase + 1) * src_linesize;
518  srcpf = srcf - srcf_linesize;
519  srcnf = srcf + srcf_linesize;
520  mapp = mapp + fbase * map_linesize;
521  prev = select_frame(fm, match1);
522  prv_linesize = prev->linesize[plane];
523  prvf_linesize = prv_linesize << 1;
524  prvpf = prev->data[plane] + fbase * prv_linesize; // previous frame, previous field
525  prvnf = prvpf + prvf_linesize; // previous frame, next field
526 
527  /* match2 */
528  fbase = get_field_base(match2, field);
529  next = select_frame(fm, match2);
530  nxt_linesize = next->linesize[plane];
531  nxtf_linesize = nxt_linesize << 1;
532  nxtpf = next->data[plane] + fbase * nxt_linesize; // next frame, previous field
533  nxtnf = nxtpf + nxtf_linesize; // next frame, next field
534 
535  map_linesize <<= 1;
536  if ((match1 >= 3 && field == 1) || (match1 < 3 && field != 1))
537  build_diff_map(fm, prvpf, prvf_linesize, nxtpf, nxtf_linesize,
538  mapp, map_linesize, height, width, plane);
539  else
540  build_diff_map(fm, prvnf, prvf_linesize, nxtnf, nxtf_linesize,
541  mapp + map_linesize, map_linesize, height, width, plane);
542 
543  for (y = 2; y < height - 2; y += 2) {
544  if (y0a == y1a || y < y0a || y > y1a) {
545  for (x = startx; x < stopx; x++) {
546  if (mapp[x] > 0 || mapp[x + map_linesize] > 0) {
547  temp1 = srcpf[x] + (srcf[x] << 2) + srcnf[x]; // [1 4 1]
548 
549  temp2 = abs(3 * (prvpf[x] + prvnf[x]) - temp1);
550  if (temp2 > 23 && ((mapp[x]&1) || (mapp[x + map_linesize]&1)))
551  accumPc += temp2;
552  if (temp2 > 42) {
553  if ((mapp[x]&2) || (mapp[x + map_linesize]&2))
554  accumPm += temp2;
555  if ((mapp[x]&4) || (mapp[x + map_linesize]&4))
556  accumPml += temp2;
557  }
558 
559  temp2 = abs(3 * (nxtpf[x] + nxtnf[x]) - temp1);
560  if (temp2 > 23 && ((mapp[x]&1) || (mapp[x + map_linesize]&1)))
561  accumNc += temp2;
562  if (temp2 > 42) {
563  if ((mapp[x]&2) || (mapp[x + map_linesize]&2))
564  accumNm += temp2;
565  if ((mapp[x]&4) || (mapp[x + map_linesize]&4))
566  accumNml += temp2;
567  }
568  }
569  }
570  }
571  prvpf += prvf_linesize;
572  prvnf += prvf_linesize;
573  srcpf += srcf_linesize;
574  srcf += srcf_linesize;
575  srcnf += srcf_linesize;
576  nxtpf += nxtf_linesize;
577  nxtnf += nxtf_linesize;
578  mapp += map_linesize;
579  }
580  }
581 
582  if (accumPm < 500 && accumNm < 500 && (accumPml >= 500 || accumNml >= 500) &&
583  FFMAX(accumPml,accumNml) > 3*FFMIN(accumPml,accumNml)) {
584  accumPm = accumPml;
585  accumNm = accumNml;
586  }
587 
588  norm1 = (int)((accumPc / 6.0f) + 0.5f);
589  norm2 = (int)((accumNc / 6.0f) + 0.5f);
590  mtn1 = (int)((accumPm / 6.0f) + 0.5f);
591  mtn2 = (int)((accumNm / 6.0f) + 0.5f);
592  c1 = ((float)FFMAX(norm1,norm2)) / ((float)FFMAX(FFMIN(norm1,norm2),1));
593  c2 = ((float)FFMAX(mtn1, mtn2)) / ((float)FFMAX(FFMIN(mtn1, mtn2), 1));
594  mr = ((float)FFMAX(mtn1, mtn2)) / ((float)FFMAX(FFMAX(norm1,norm2),1));
595  if (((mtn1 >= 500 || mtn2 >= 500) && (mtn1*2 < mtn2*1 || mtn2*2 < mtn1*1)) ||
596  ((mtn1 >= 1000 || mtn2 >= 1000) && (mtn1*3 < mtn2*2 || mtn2*3 < mtn1*2)) ||
597  ((mtn1 >= 2000 || mtn2 >= 2000) && (mtn1*5 < mtn2*4 || mtn2*5 < mtn1*4)) ||
598  ((mtn1 >= 4000 || mtn2 >= 4000) && c2 > c1))
599  ret = mtn1 > mtn2 ? match2 : match1;
600  else if (mr > 0.005 && FFMAX(mtn1, mtn2) > 150 && (mtn1*2 < mtn2*1 || mtn2*2 < mtn1*1))
601  ret = mtn1 > mtn2 ? match2 : match1;
602  else
603  ret = norm1 > norm2 ? match2 : match1;
604  return ret;
605 }
606 
607 static void copy_fields(const FieldMatchContext *fm, AVFrame *dst,
608  const AVFrame *src, int field)
609 {
610  int plane;
611  for (plane = 0; plane < 4 && src->data[plane] && src->linesize[plane]; plane++)
612  av_image_copy_plane(dst->data[plane] + field*dst->linesize[plane], dst->linesize[plane] << 1,
613  src->data[plane] + field*src->linesize[plane], src->linesize[plane] << 1,
614  get_width(fm, src, plane), get_height(fm, src, plane) / 2);
615 }
616 
617 static AVFrame *create_weave_frame(AVFilterContext *ctx, int match, int field,
618  const AVFrame *prv, AVFrame *src, const AVFrame *nxt)
619 {
620  AVFrame *dst;
621  FieldMatchContext *fm = ctx->priv;
622 
623  if (match == mC) {
624  dst = av_frame_clone(src);
625  } else {
626  AVFilterLink *outlink = ctx->outputs[0];
627 
628  dst = ff_get_video_buffer(outlink, outlink->w, outlink->h);
629  if (!dst)
630  return NULL;
631  av_frame_copy_props(dst, src);
632 
633  switch (match) {
634  case mP: copy_fields(fm, dst, src, 1-field); copy_fields(fm, dst, prv, field); break;
635  case mN: copy_fields(fm, dst, src, 1-field); copy_fields(fm, dst, nxt, field); break;
636  case mB: copy_fields(fm, dst, src, field); copy_fields(fm, dst, prv, 1-field); break;
637  case mU: copy_fields(fm, dst, src, field); copy_fields(fm, dst, nxt, 1-field); break;
638  default: av_assert0(0);
639  }
640  }
641  return dst;
642 }
643 
644 static int checkmm(AVFilterContext *ctx, int *combs, int m1, int m2,
645  AVFrame **gen_frames, int field)
646 {
647  const FieldMatchContext *fm = ctx->priv;
648 
649 #define LOAD_COMB(mid) do { \
650  if (combs[mid] < 0) { \
651  if (!gen_frames[mid]) \
652  gen_frames[mid] = create_weave_frame(ctx, mid, field, \
653  fm->prv, fm->src, fm->nxt); \
654  combs[mid] = calc_combed_score(fm, gen_frames[mid]); \
655  } \
656 } while (0)
657 
658  LOAD_COMB(m1);
659  LOAD_COMB(m2);
660 
661  if ((combs[m2] * 3 < combs[m1] || (combs[m2] * 2 < combs[m1] && combs[m1] > fm->combpel)) &&
662  abs(combs[m2] - combs[m1]) >= 30 && combs[m2] < fm->combpel)
663  return m2;
664  else
665  return m1;
666 }
667 
668 static const int fxo0m[] = { mP, mC, mN, mB, mU };
669 static const int fxo1m[] = { mN, mC, mP, mU, mB };
670 
671 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
672 {
673  AVFilterContext *ctx = inlink->dst;
674  AVFilterLink *outlink = ctx->outputs[0];
675  FieldMatchContext *fm = ctx->priv;
676  int combs[] = { -1, -1, -1, -1, -1 };
677  int order, field, i, match, sc = 0;
678  const int *fxo;
679  AVFrame *gen_frames[] = { NULL, NULL, NULL, NULL, NULL };
680  AVFrame *dst;
681 
682  /* update frames queue(s) */
683 #define SLIDING_FRAME_WINDOW(prv, src, nxt) do { \
684  if (prv != src) /* 2nd loop exception (1st has prv==src and we don't want to loose src) */ \
685  av_frame_free(&prv); \
686  prv = src; \
687  src = nxt; \
688  if (in) \
689  nxt = in; \
690  if (!prv) \
691  prv = src; \
692  if (!prv) /* received only one frame at that point */ \
693  return 0; \
694  av_assert0(prv && src && nxt); \
695 } while (0)
696  if (FF_INLINK_IDX(inlink) == INPUT_MAIN) {
697  SLIDING_FRAME_WINDOW(fm->prv, fm->src, fm->nxt);
698  fm->got_frame[INPUT_MAIN] = 1;
699  } else {
700  SLIDING_FRAME_WINDOW(fm->prv2, fm->src2, fm->nxt2);
701  fm->got_frame[INPUT_CLEANSRC] = 1;
702  }
703  if (!fm->got_frame[INPUT_MAIN] || (fm->ppsrc && !fm->got_frame[INPUT_CLEANSRC]))
704  return 0;
706  in = fm->src;
707 
708  /* parity */
709  order = fm->order != FM_PARITY_AUTO ? fm->order : (in->interlaced_frame ? in->top_field_first : 1);
710  field = fm->field != FM_PARITY_AUTO ? fm->field : order;
711  av_assert0(order == 0 || order == 1 || field == 0 || field == 1);
712  fxo = field ^ order ? fxo1m : fxo0m;
713 
714  /* debug mode: we generate all the fields combinations and their associated
715  * combed score. XXX: inject as frame metadata? */
716  if (fm->combdbg) {
717  for (i = 0; i < FF_ARRAY_ELEMS(combs); i++) {
718  if (i > mN && fm->combdbg == COMBDBG_PCN)
719  break;
720  gen_frames[i] = create_weave_frame(ctx, i, field, fm->prv, fm->src, fm->nxt);
721  if (!gen_frames[i])
722  return AVERROR(ENOMEM);
723  combs[i] = calc_combed_score(fm, gen_frames[i]);
724  }
725  av_log(ctx, AV_LOG_INFO, "COMBS: %3d %3d %3d %3d %3d\n",
726  combs[0], combs[1], combs[2], combs[3], combs[4]);
727  } else {
728  gen_frames[mC] = av_frame_clone(fm->src);
729  if (!gen_frames[mC])
730  return AVERROR(ENOMEM);
731  }
732 
733  /* p/c selection and optional 3-way p/c/n matches */
734  match = compare_fields(fm, fxo[mC], fxo[mP], field);
735  if (fm->mode == MODE_PCN || fm->mode == MODE_PCN_UB)
736  match = compare_fields(fm, match, fxo[mN], field);
737 
738  /* scene change check */
739  if (fm->combmatch == COMBMATCH_SC) {
740  if (fm->lastn == outlink->frame_count - 1) {
741  if (fm->lastscdiff > fm->scthresh)
742  sc = 1;
743  } else if (luma_abs_diff(fm->prv, fm->src) > fm->scthresh) {
744  sc = 1;
745  }
746 
747  if (!sc) {
748  fm->lastn = outlink->frame_count;
749  fm->lastscdiff = luma_abs_diff(fm->src, fm->nxt);
750  sc = fm->lastscdiff > fm->scthresh;
751  }
752  }
753 
754  if (fm->combmatch == COMBMATCH_FULL || (fm->combmatch == COMBMATCH_SC && sc)) {
755  switch (fm->mode) {
756  /* 2-way p/c matches */
757  case MODE_PC:
758  match = checkmm(ctx, combs, match, match == fxo[mP] ? fxo[mC] : fxo[mP], gen_frames, field);
759  break;
760  case MODE_PC_N:
761  match = checkmm(ctx, combs, match, fxo[mN], gen_frames, field);
762  break;
763  case MODE_PC_U:
764  match = checkmm(ctx, combs, match, fxo[mU], gen_frames, field);
765  break;
766  case MODE_PC_N_UB:
767  match = checkmm(ctx, combs, match, fxo[mN], gen_frames, field);
768  match = checkmm(ctx, combs, match, fxo[mU], gen_frames, field);
769  match = checkmm(ctx, combs, match, fxo[mB], gen_frames, field);
770  break;
771  /* 3-way p/c/n matches */
772  case MODE_PCN:
773  match = checkmm(ctx, combs, match, match == fxo[mP] ? fxo[mC] : fxo[mP], gen_frames, field);
774  break;
775  case MODE_PCN_UB:
776  match = checkmm(ctx, combs, match, fxo[mU], gen_frames, field);
777  match = checkmm(ctx, combs, match, fxo[mB], gen_frames, field);
778  break;
779  default:
780  av_assert0(0);
781  }
782  }
783 
784  /* get output frame and drop the others */
785  if (fm->ppsrc) {
786  /* field matching was based on a filtered/post-processed input, we now
787  * pick the untouched fields from the clean source */
788  dst = create_weave_frame(ctx, match, field, fm->prv2, fm->src2, fm->nxt2);
789  } else {
790  if (!gen_frames[match]) { // XXX: is that possible?
791  dst = create_weave_frame(ctx, match, field, fm->prv, fm->src, fm->nxt);
792  } else {
793  dst = gen_frames[match];
794  gen_frames[match] = NULL;
795  }
796  }
797  if (!dst)
798  return AVERROR(ENOMEM);
799  for (i = 0; i < FF_ARRAY_ELEMS(gen_frames); i++)
800  av_frame_free(&gen_frames[i]);
801 
802  /* mark the frame we are unable to match properly as interlaced so a proper
803  * de-interlacer can take the relay */
804  dst->interlaced_frame = combs[match] >= fm->combpel;
805  if (dst->interlaced_frame) {
806  av_log(ctx, AV_LOG_WARNING, "Frame #%"PRId64" at %s is still interlaced\n",
807  outlink->frame_count, av_ts2timestr(in->pts, &inlink->time_base));
808  dst->top_field_first = field;
809  }
810 
811  av_log(ctx, AV_LOG_DEBUG, "SC:%d | COMBS: %3d %3d %3d %3d %3d (combpel=%d)"
812  " match=%d combed=%s\n", sc, combs[0], combs[1], combs[2], combs[3], combs[4],
813  fm->combpel, match, dst->interlaced_frame ? "YES" : "NO");
814 
815  return ff_filter_frame(outlink, dst);
816 }
817 
818 static int request_inlink(AVFilterContext *ctx, int lid)
819 {
820  int ret = 0;
821  FieldMatchContext *fm = ctx->priv;
822 
823  if (!fm->got_frame[lid]) {
824  AVFilterLink *inlink = ctx->inputs[lid];
825  ret = ff_request_frame(inlink);
826  if (ret == AVERROR_EOF) { // flushing
827  fm->eof |= 1 << lid;
828  ret = filter_frame(inlink, NULL);
829  }
830  }
831  return ret;
832 }
833 
834 static int request_frame(AVFilterLink *outlink)
835 {
836  int ret;
837  AVFilterContext *ctx = outlink->src;
838  FieldMatchContext *fm = ctx->priv;
839  const uint32_t eof_mask = 1<<INPUT_MAIN | fm->ppsrc<<INPUT_CLEANSRC;
840 
841  if ((fm->eof & eof_mask) == eof_mask) // flush done?
842  return AVERROR_EOF;
843  if ((ret = request_inlink(ctx, INPUT_MAIN)) < 0)
844  return ret;
845  if (fm->ppsrc && (ret = request_inlink(ctx, INPUT_CLEANSRC)) < 0)
846  return ret;
847  return 0;
848 }
849 
851 {
852  // TODO: second input source can support >8bit depth
853  static const enum AVPixelFormat pix_fmts[] = {
857  };
859  return 0;
860 }
861 
862 static int config_input(AVFilterLink *inlink)
863 {
864  int ret;
865  AVFilterContext *ctx = inlink->dst;
866  FieldMatchContext *fm = ctx->priv;
867  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
868  const int w = inlink->w;
869  const int h = inlink->h;
870 
871  fm->scthresh = (int64_t)((w * h * 255.0 * fm->scthresh_flt) / 100.0);
872 
873  if ((ret = av_image_alloc(fm->map_data, fm->map_linesize, w, h, inlink->format, 32)) < 0 ||
874  (ret = av_image_alloc(fm->cmask_data, fm->cmask_linesize, w, h, inlink->format, 32)) < 0)
875  return ret;
876 
877  fm->hsub = pix_desc->log2_chroma_w;
878  fm->vsub = pix_desc->log2_chroma_h;
879 
880  fm->tpitchy = FFALIGN(w, 16);
881  fm->tpitchuv = FFALIGN(w >> 1, 16);
882 
883  fm->tbuffer = av_malloc(h/2 * fm->tpitchy);
884  fm->c_array = av_malloc((((w + fm->blockx/2)/fm->blockx)+1) *
885  (((h + fm->blocky/2)/fm->blocky)+1) *
886  4 * sizeof(*fm->c_array));
887  if (!fm->tbuffer || !fm->c_array)
888  return AVERROR(ENOMEM);
889 
890  return 0;
891 }
892 
894 {
895  const FieldMatchContext *fm = ctx->priv;
896  AVFilterPad pad = {
897  .name = av_strdup("main"),
898  .type = AVMEDIA_TYPE_VIDEO,
899  .filter_frame = filter_frame,
900  .config_props = config_input,
901  };
902 
903  if (!pad.name)
904  return AVERROR(ENOMEM);
905  ff_insert_inpad(ctx, INPUT_MAIN, &pad);
906 
907  if (fm->ppsrc) {
908  pad.name = av_strdup("clean_src");
909  pad.config_props = NULL;
910  if (!pad.name)
911  return AVERROR(ENOMEM);
912  ff_insert_inpad(ctx, INPUT_CLEANSRC, &pad);
913  }
914 
915  if ((fm->blockx & (fm->blockx - 1)) ||
916  (fm->blocky & (fm->blocky - 1))) {
917  av_log(ctx, AV_LOG_ERROR, "blockx and blocky settings must be power of two\n");
918  return AVERROR(EINVAL);
919  }
920 
921  if (fm->combpel > fm->blockx * fm->blocky) {
922  av_log(ctx, AV_LOG_ERROR, "Combed pixel should not be larger than blockx x blocky\n");
923  return AVERROR(EINVAL);
924  }
925 
926  return 0;
927 }
928 
930 {
931  int i;
932  FieldMatchContext *fm = ctx->priv;
933 
934  if (fm->prv != fm->src)
935  av_frame_free(&fm->prv);
936  if (fm->nxt != fm->src)
937  av_frame_free(&fm->nxt);
938  av_frame_free(&fm->src);
939  av_freep(&fm->map_data[0]);
940  av_freep(&fm->cmask_data[0]);
941  av_freep(&fm->tbuffer);
942  av_freep(&fm->c_array);
943  for (i = 0; i < ctx->nb_inputs; i++)
944  av_freep(&ctx->input_pads[i].name);
945 }
946 
947 static int config_output(AVFilterLink *outlink)
948 {
949  AVFilterContext *ctx = outlink->src;
950  const FieldMatchContext *fm = ctx->priv;
951  const AVFilterLink *inlink =
952  ctx->inputs[fm->ppsrc ? INPUT_CLEANSRC : INPUT_MAIN];
953 
954  outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
955  outlink->time_base = inlink->time_base;
956  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
957  outlink->frame_rate = inlink->frame_rate;
958  outlink->w = inlink->w;
959  outlink->h = inlink->h;
960  return 0;
961 }
962 
963 static const AVFilterPad fieldmatch_outputs[] = {
964  {
965  .name = "default",
966  .type = AVMEDIA_TYPE_VIDEO,
967  .request_frame = request_frame,
968  .config_props = config_output,
969  },
970  { NULL }
971 };
972 
974  .name = "fieldmatch",
975  .description = NULL_IF_CONFIG_SMALL("Field matching for inverse telecine."),
976  .query_formats = query_formats,
977  .priv_size = sizeof(FieldMatchContext),
980  .inputs = NULL,
981  .outputs = fieldmatch_outputs,
982  .priv_class = &fieldmatch_class,
984 };