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vf_detc.c
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17  */
18 
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 
23 #include "config.h"
24 #include "mp_msg.h"
25 
26 #include "img_format.h"
27 #include "mp_image.h"
28 #include "vf.h"
29 
30 #include "libvo/fastmemcpy.h"
31 
32 struct metrics {
33  int even;
34  int odd;
35  int noise;
36  int temp;
37 };
38 
39 struct vf_priv_s {
40  int frame;
41  int drop, lastdrop;
42  struct metrics pm;
43  int thres[5];
44  int inframes, outframes;
45  int mode;
46  int (*analyze)(struct vf_priv_s *, mp_image_t *, mp_image_t *);
47  int needread;
48 };
49 
50 #define COMPE(a,b,e) (abs((a)-(b)) < (((a)+(b))>>(e)))
51 #define COMPARABLE(a,b) COMPE((a),(b),2)
52 #define VERYCLOSE(a,b) COMPE((a),(b),3)
53 
54 #define OUTER_TC_NBHD(s) ( \
55  COMPARABLE((s)[-1].m.even,(s)[-1].m.odd) && \
56  COMPARABLE((s)[1].m.even,(s)[0].m.odd) && \
57  COMPARABLE((s)[2].m.even,(s)[1].m.odd) && \
58  COMPARABLE((s)[-1].m.noise,(s)[0].m.temp) && \
59  COMPARABLE((s)[2].m.noise,(s)[2].m.temp) )
60 
61 #define INNER_TC_NBHD(s,l,h) ( \
62  COMPARABLE((s)[0].m.even,(l)) && \
63  COMPARABLE((s)[2].m.odd,(l)) && ( \
64  COMPARABLE((s)[0].m.noise,(h)) || \
65  COMPARABLE((s)[1].m.noise,(h)) ) )
66 
67 enum {
68  TC_DROP,
69  TC_PROG,
70  TC_IL1,
71  TC_IL2
72 };
73 
74 static void block_diffs(struct metrics *m, unsigned char *old, unsigned char *new, int os, int ns)
75 {
76  int x, y, even=0, odd=0, noise, temp;
77  unsigned char *oldp, *newp;
78  m->noise = m->temp = 0;
79  for (x = 8; x; x--) {
80  oldp = old++;
81  newp = new++;
82  noise = temp = 0;
83  for (y = 4; y; y--) {
84  even += abs(newp[0]-oldp[0]);
85  odd += abs(newp[ns]-oldp[os]);
86  noise += newp[ns]-newp[0];
87  temp += oldp[os]-newp[0];
88  oldp += os<<1;
89  newp += ns<<1;
90  }
91  m->noise += abs(noise);
92  m->temp += abs(temp);
93  }
94  m->even = even;
95  m->odd = odd;
96 }
97 
98 static void diff_planes(struct metrics *m, unsigned char *old, unsigned char *new, int w, int h, int os, int ns)
99 {
100  int x, y, me=0, mo=0, mn=0, mt=0;
101  struct metrics l;
102  for (y = 0; y < h-7; y += 8) {
103  for (x = 0; x < w-7; x += 8) {
104  block_diffs(&l, old+x+y*os, new+x+y*ns, os, ns);
105  if (l.even > me) me = l.even;
106  if (l.odd > mo) mo = l.odd;
107  if (l.noise > mn) mn = l.noise;
108  if (l.temp > mt) mt = l.temp;
109  }
110  }
111  m->even = me;
112  m->odd = mo;
113  m->noise = mn;
114  m->temp = mt;
115 }
116 
117 static void diff_fields(struct metrics *metr, mp_image_t *old, mp_image_t *new)
118 {
119  struct metrics m, mu, mv;
120  diff_planes(&m, old->planes[0], new->planes[0],
121  new->w, new->h, old->stride[0], new->stride[0]);
122  if (new->flags & MP_IMGFLAG_PLANAR) {
123  diff_planes(&mu, old->planes[1], new->planes[1],
124  new->chroma_width, new->chroma_height,
125  old->stride[1], new->stride[1]);
126  diff_planes(&mv, old->planes[2], new->planes[2],
127  new->chroma_width, new->chroma_height,
128  old->stride[2], new->stride[2]);
129  if (mu.even > m.even) m.even = mu.even;
130  if (mu.odd > m.odd) m.odd = mu.odd;
131  if (mu.noise > m.noise) m.noise = mu.noise;
132  if (mu.temp > m.temp) m.temp = mu.temp;
133  if (mv.even > m.even) m.even = mv.even;
134  if (mv.odd > m.odd) m.odd = mv.odd;
135  if (mv.noise > m.noise) m.noise = mv.noise;
136  if (mv.temp > m.temp) m.temp = mv.temp;
137  }
138  *metr = m;
139 }
140 
141 static void status(int f, struct metrics *m)
142 {
143  ff_mp_msg(MSGT_VFILTER, MSGL_V, "frame %d: e=%d o=%d n=%d t=%d\n",
144  f, m->even, m->odd, m->noise, m->temp);
145 }
146 
147 static int analyze_fixed_pattern(struct vf_priv_s *p, mp_image_t *new, mp_image_t *old)
148 {
149  if (p->frame >= 0) p->frame = (p->frame+1)%5;
150  ff_mp_msg(MSGT_VFILTER, MSGL_V, "frame %d\n", p->frame);
151  switch (p->frame) {
152  case -1: case 0: case 1: case 2:
153  return TC_PROG;
154  case 3:
155  return TC_IL1;
156  case 4:
157  return TC_IL2;
158  }
159  return 0;
160 }
161 
162 static int analyze_aggressive(struct vf_priv_s *p, mp_image_t *new, mp_image_t *old)
163 {
164  struct metrics m, pm;
165 
166  if (p->frame >= 0) p->frame = (p->frame+1)%5;
167 
168  diff_fields(&m, old, new);
169 
170  status(p->frame, &m);
171 
172  pm = p->pm;
173  p->pm = m;
174 
175  if (p->frame == 4) {
176  /* We need to break at scene changes, but is this a valid test? */
177  if ((m.even > p->thres[2]) && (m.odd > p->thres[2]) && (m.temp > p->thres[3])
178  && (m.temp > 5*pm.temp) && (m.temp*2 > m.noise)) {
179  ff_mp_msg(MSGT_VFILTER, MSGL_V, "scene change breaking telecine!\n");
180  p->frame = -1;
181  return TC_DROP;
182  }
183  /* Thres. is to compensate for quantization errors when noise is low */
184  if (m.noise - m.temp > -p->thres[4]) {
185  if (COMPARABLE(m.even, pm.odd)) {
186  //ff_mp_msg(MSGT_VFILTER, MSGL_V, "confirmed field match!\n");
187  return TC_IL2;
188  } else if ((m.even < p->thres[0]) && (m.odd < p->thres[0]) && VERYCLOSE(m.even, m.odd)
189  && VERYCLOSE(m.noise,m.temp) && VERYCLOSE(m.noise,pm.noise)) {
190  ff_mp_msg(MSGT_VFILTER, MSGL_V, "interlaced frame appears in duplicate!!!\n");
191  p->pm = pm; /* hack :) */
192  p->frame = 3;
193  return TC_IL1;
194  }
195  } else {
196  ff_mp_msg(MSGT_VFILTER, MSGL_V, "mismatched telecine fields!\n");
197  p->frame = -1;
198  }
199  }
200 
201  if (2*m.even*m.temp < m.odd*m.noise) {
202  ff_mp_msg(MSGT_VFILTER, MSGL_V, "caught telecine sync!\n");
203  p->frame = 3;
204  return TC_IL1;
205  }
206 
207  if (p->frame < 3) {
208  if (m.noise > p->thres[3]) {
209  if (m.noise > 2*m.temp) {
210  ff_mp_msg(MSGT_VFILTER, MSGL_V, "merging fields out of sequence!\n");
211  return TC_IL2;
212  }
213  if ((m.noise > 2*pm.noise) && (m.even > p->thres[2]) && (m.odd > p->thres[2])) {
214  ff_mp_msg(MSGT_VFILTER, MSGL_V, "dropping horrible interlaced frame!\n");
215  return TC_DROP;
216  }
217  }
218  }
219 
220  switch (p->frame) {
221  case -1:
222  if (4*m.noise > 5*m.temp) {
223  ff_mp_msg(MSGT_VFILTER, MSGL_V, "merging fields out of sequence!\n");
224  return TC_IL2;
225  }
226  case 0:
227  case 1:
228  case 2:
229  return TC_PROG;
230  case 3:
231  if ((m.even > p->thres[1]) && (m.even > m.odd) && (m.temp > m.noise)) {
232  ff_mp_msg(MSGT_VFILTER, MSGL_V, "lost telecine tracking!\n");
233  p->frame = -1;
234  return TC_PROG;
235  }
236  return TC_IL1;
237  case 4:
238  return TC_IL2;
239  }
240  return 0;
241 }
242 
243 static void copy_image(mp_image_t *dmpi, mp_image_t *mpi, int field)
244 {
245  switch (field) {
246  case 0:
247  my_memcpy_pic(dmpi->planes[0], mpi->planes[0], mpi->w, mpi->h/2,
248  dmpi->stride[0]*2, mpi->stride[0]*2);
249  if (mpi->flags & MP_IMGFLAG_PLANAR) {
250  my_memcpy_pic(dmpi->planes[1], mpi->planes[1],
251  mpi->chroma_width, mpi->chroma_height/2,
252  dmpi->stride[1]*2, mpi->stride[1]*2);
253  my_memcpy_pic(dmpi->planes[2], mpi->planes[2],
254  mpi->chroma_width, mpi->chroma_height/2,
255  dmpi->stride[2]*2, mpi->stride[2]*2);
256  }
257  break;
258  case 1:
259  my_memcpy_pic(dmpi->planes[0]+dmpi->stride[0],
260  mpi->planes[0]+mpi->stride[0], mpi->w, mpi->h/2,
261  dmpi->stride[0]*2, mpi->stride[0]*2);
262  if (mpi->flags & MP_IMGFLAG_PLANAR) {
263  my_memcpy_pic(dmpi->planes[1]+dmpi->stride[1],
264  mpi->planes[1]+mpi->stride[1],
265  mpi->chroma_width, mpi->chroma_height/2,
266  dmpi->stride[1]*2, mpi->stride[1]*2);
267  my_memcpy_pic(dmpi->planes[2]+dmpi->stride[2],
268  mpi->planes[2]+mpi->stride[2],
269  mpi->chroma_width, mpi->chroma_height/2,
270  dmpi->stride[2]*2, mpi->stride[2]*2);
271  }
272  break;
273  case 2:
274  memcpy_pic(dmpi->planes[0], mpi->planes[0], mpi->w, mpi->h,
275  dmpi->stride[0], mpi->stride[0]);
276  if (mpi->flags & MP_IMGFLAG_PLANAR) {
277  memcpy_pic(dmpi->planes[1], mpi->planes[1],
278  mpi->chroma_width, mpi->chroma_height,
279  dmpi->stride[1], mpi->stride[1]);
280  memcpy_pic(dmpi->planes[2], mpi->planes[2],
281  mpi->chroma_width, mpi->chroma_height,
282  dmpi->stride[2], mpi->stride[2]);
283  }
284  break;
285  }
286 }
287 
288 static int do_put_image(struct vf_instance *vf, mp_image_t *dmpi)
289 {
290  struct vf_priv_s *p = vf->priv;
291  int dropflag;
292 
293  switch (p->drop) {
294  default:
295  dropflag = 0;
296  break;
297  case 1:
298  dropflag = (++p->lastdrop >= 5);
299  break;
300  case 2:
301  dropflag = (++p->lastdrop >= 5) && (4*p->inframes <= 5*p->outframes);
302  break;
303  }
304 
305  if (dropflag) {
306  ff_mp_msg(MSGT_VFILTER, MSGL_V, "drop! [%d/%d=%g]\n",
307  p->outframes, p->inframes, (float)p->outframes/p->inframes);
308  p->lastdrop = 0;
309  return 0;
310  }
311 
312  p->outframes++;
313  return ff_vf_next_put_image(vf, dmpi, MP_NOPTS_VALUE);
314 }
315 
316 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts)
317 {
318  int ret=0;
319  mp_image_t *dmpi;
320  struct vf_priv_s *p = vf->priv;
321 
322  p->inframes++;
323 
324  if (p->needread) dmpi = ff_vf_get_image(vf->next, mpi->imgfmt,
325  MP_IMGTYPE_STATIC, MP_IMGFLAG_ACCEPT_STRIDE |
326  MP_IMGFLAG_PRESERVE | MP_IMGFLAG_READABLE,
327  mpi->width, mpi->height);
328  /* FIXME: is there a good way to get rid of static type? */
329  else dmpi = ff_vf_get_image(vf->next, mpi->imgfmt,
330  MP_IMGTYPE_STATIC, MP_IMGFLAG_ACCEPT_STRIDE |
331  MP_IMGFLAG_PRESERVE, mpi->width, mpi->height);
332 
333  switch (p->analyze(p, mpi, dmpi)) {
334  case TC_DROP:
335  /* Don't copy anything unless we'll need to read it. */
336  if (p->needread) copy_image(dmpi, mpi, 2);
337  p->lastdrop = 0;
338  break;
339  case TC_PROG:
340  /* Copy and display the whole frame. */
341  copy_image(dmpi, mpi, 2);
342  ret = do_put_image(vf, dmpi);
343  break;
344  case TC_IL1:
345  /* Only copy bottom field unless we need to read. */
346  if (p->needread) copy_image(dmpi, mpi, 2);
347  else copy_image(dmpi, mpi, 1);
348  p->lastdrop = 0;
349  break;
350  case TC_IL2:
351  /* Copy top field and show frame, then copy bottom if needed. */
352  copy_image(dmpi, mpi, 0);
353  ret = do_put_image(vf, dmpi);
354  if (p->needread) copy_image(dmpi, mpi, 1);
355  break;
356  }
357  return ret;
358 }
359 
360 static int query_format(struct vf_instance *vf, unsigned int fmt)
361 {
362  /* FIXME - figure out which other formats work */
363  switch (fmt) {
364  case IMGFMT_YV12:
365  case IMGFMT_IYUV:
366  case IMGFMT_I420:
367  return ff_vf_next_query_format(vf, fmt);
368  }
369  return 0;
370 }
371 
372 static int config(struct vf_instance *vf,
373  int width, int height, int d_width, int d_height,
374  unsigned int flags, unsigned int outfmt)
375 {
376  return ff_vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
377 }
378 
379 static void uninit(struct vf_instance *vf)
380 {
381  free(vf->priv);
382 }
383 
384 static struct {
385  const char *name;
386  int (*func)(struct vf_priv_s *p, mp_image_t *new, mp_image_t *old);
387  int needread;
388 } anal_funcs[] = {
389  { "fixed", analyze_fixed_pattern, 0 },
390  { "aggressive", analyze_aggressive, 1 },
391  { NULL, NULL, 0 }
392 };
393 
394 #define STARTVARS if (0)
395 #define GETVAR(str, name, out, func) \
396  else if (!strncmp((str), name "=", sizeof(name))) \
397  (out) = (func)((str) + sizeof(name))
398 
399 static void parse_var(struct vf_priv_s *p, char *var)
400 {
401  STARTVARS;
402  GETVAR(var, "dr", p->drop, atoi);
403  GETVAR(var, "t0", p->thres[0], atoi);
404  GETVAR(var, "t1", p->thres[1], atoi);
405  GETVAR(var, "t2", p->thres[2], atoi);
406  GETVAR(var, "t3", p->thres[3], atoi);
407  GETVAR(var, "t4", p->thres[4], atoi);
408  GETVAR(var, "fr", p->frame, atoi);
409  GETVAR(var, "am", p->mode, atoi);
410 }
411 
412 static void parse_args(struct vf_priv_s *p, char *args)
413 {
414  char *next, *orig;
415  for (args=orig=strdup(args); args; args=next) {
416  next = strchr(args, ':');
417  if (next) *next++ = 0;
418  parse_var(p, args);
419  }
420  free(orig);
421 }
422 
423 static int vf_open(vf_instance_t *vf, char *args)
424 {
425  struct vf_priv_s *p;
426  vf->config = config;
427  vf->put_image = put_image;
428  vf->query_format = query_format;
429  vf->uninit = uninit;
430  vf->default_reqs = VFCAP_ACCEPT_STRIDE;
431  vf->priv = p = calloc(1, sizeof(struct vf_priv_s));
432  p->frame = -1;
433  p->thres[0] = 440;
434  p->thres[1] = 720;
435  p->thres[2] = 2500;
436  p->thres[3] = 2500;
437  p->thres[4] = 800;
438  p->drop = 0;
439  p->mode = 1;
440  if (args) parse_args(p, args);
441  p->analyze = anal_funcs[p->mode].func;
442  p->needread = anal_funcs[p->mode].needread;
443  return 1;
444 }
445 
446 const vf_info_t ff_vf_info_detc = {
447  "de-telecine filter",
448  "detc",
449  "Rich Felker",
450  "",
451  vf_open,
452  NULL
453 };
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