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vf_yadif.c
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1 /*
2  * Copyright (C) 2006-2011 Michael Niedermayer <michaelni@gmx.at>
3  * 2010 James Darnley <james.darnley@gmail.com>
4  *
5  * FFmpeg is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * FFmpeg is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */
19 
20 #include "libavutil/avassert.h"
21 #include "libavutil/cpu.h"
22 #include "libavutil/common.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/pixdesc.h"
25 #include "avfilter.h"
26 #include "formats.h"
27 #include "internal.h"
28 #include "video.h"
29 #include "yadif.h"
30 
31 #undef NDEBUG
32 #include <assert.h>
33 
34 #define PERM_RWP AV_PERM_WRITE | AV_PERM_PRESERVE | AV_PERM_REUSE
35 
36 #define CHECK(j)\
37  { int score = FFABS(cur[mrefs-1+(j)] - cur[prefs-1-(j)])\
38  + FFABS(cur[mrefs +(j)] - cur[prefs -(j)])\
39  + FFABS(cur[mrefs+1+(j)] - cur[prefs+1-(j)]);\
40  if (score < spatial_score) {\
41  spatial_score= score;\
42  spatial_pred= (cur[mrefs +(j)] + cur[prefs -(j)])>>1;\
43 
44 #define FILTER \
45  for (x = 0; x < w; x++) { \
46  int c = cur[mrefs]; \
47  int d = (prev2[0] + next2[0])>>1; \
48  int e = cur[prefs]; \
49  int temporal_diff0 = FFABS(prev2[0] - next2[0]); \
50  int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e) )>>1; \
51  int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e) )>>1; \
52  int diff = FFMAX3(temporal_diff0 >> 1, temporal_diff1, temporal_diff2); \
53  int spatial_pred = (c+e) >> 1; \
54  int spatial_score = FFABS(cur[mrefs - 1] - cur[prefs - 1]) + FFABS(c-e) \
55  + FFABS(cur[mrefs + 1] - cur[prefs + 1]) - 1; \
56  \
57  CHECK(-1) CHECK(-2) }} }} \
58  CHECK( 1) CHECK( 2) }} }} \
59  \
60  if (mode < 2) { \
61  int b = (prev2[2 * mrefs] + next2[2 * mrefs])>>1; \
62  int f = (prev2[2 * prefs] + next2[2 * prefs])>>1; \
63  int max = FFMAX3(d - e, d - c, FFMIN(b - c, f - e)); \
64  int min = FFMIN3(d - e, d - c, FFMAX(b - c, f - e)); \
65  \
66  diff = FFMAX3(diff, min, -max); \
67  } \
68  \
69  if (spatial_pred > d + diff) \
70  spatial_pred = d + diff; \
71  else if (spatial_pred < d - diff) \
72  spatial_pred = d - diff; \
73  \
74  dst[0] = spatial_pred; \
75  \
76  dst++; \
77  cur++; \
78  prev++; \
79  next++; \
80  prev2++; \
81  next2++; \
82  }
83 
84 static void filter_line_c(uint8_t *dst,
85  uint8_t *prev, uint8_t *cur, uint8_t *next,
86  int w, int prefs, int mrefs, int parity, int mode)
87 {
88  int x;
89  uint8_t *prev2 = parity ? prev : cur ;
90  uint8_t *next2 = parity ? cur : next;
91 
92  FILTER
93 }
94 
95 static void filter_line_c_16bit(uint16_t *dst,
96  uint16_t *prev, uint16_t *cur, uint16_t *next,
97  int w, int prefs, int mrefs, int parity,
98  int mode)
99 {
100  int x;
101  uint16_t *prev2 = parity ? prev : cur ;
102  uint16_t *next2 = parity ? cur : next;
103  mrefs /= 2;
104  prefs /= 2;
105 
106  FILTER
107 }
108 
109 static void filter(AVFilterContext *ctx, AVFilterBufferRef *dstpic,
110  int parity, int tff)
111 {
112  YADIFContext *yadif = ctx->priv;
113  int y, i;
114 
115  for (i = 0; i < yadif->csp->nb_components; i++) {
116  int w = dstpic->video->w;
117  int h = dstpic->video->h;
118  int refs = yadif->cur->linesize[i];
119  int absrefs = FFABS(refs);
120  int df = (yadif->csp->comp[i].depth_minus1 + 8) / 8;
121 
122  if (i == 1 || i == 2) {
123  /* Why is this not part of the per-plane description thing? */
124  w >>= yadif->csp->log2_chroma_w;
125  h >>= yadif->csp->log2_chroma_h;
126  }
127 
128  if(yadif->temp_line_size < absrefs) {
129  av_free(yadif->temp_line);
130  yadif->temp_line = av_mallocz(2*64 + 5*absrefs);
131  yadif->temp_line_size = absrefs;
132  }
133 
134  for (y = 0; y < h; y++) {
135  if ((y ^ parity) & 1) {
136  uint8_t *prev = &yadif->prev->data[i][y * refs];
137  uint8_t *cur = &yadif->cur ->data[i][y * refs];
138  uint8_t *next = &yadif->next->data[i][y * refs];
139  uint8_t *dst = &dstpic->data[i][y * dstpic->linesize[i]];
140  int mode = y == 1 || y + 2 == h ? 2 : yadif->mode;
141  int prefs = y+1<h ? refs : -refs;
142  int mrefs = y ?-refs : refs;
143 
144  if(y<=1 || y+2>=h) {
145  uint8_t *tmp = yadif->temp_line + 64 + 2*absrefs;
146  if(mode<2)
147  memcpy(tmp+2*mrefs, cur+2*mrefs, w*df);
148  memcpy(tmp+mrefs, cur+mrefs, w*df);
149  memcpy(tmp , cur , w*df);
150  if(prefs != mrefs) {
151  memcpy(tmp+prefs, cur+prefs, w*df);
152  if(mode<2)
153  memcpy(tmp+2*prefs, cur+2*prefs, w*df);
154  }
155  cur = tmp;
156  }
157 
158  yadif->filter_line(dst, prev, cur, next, w,
159  prefs, mrefs,
160  parity ^ tff, mode);
161  } else {
162  memcpy(&dstpic->data[i][y * dstpic->linesize[i]],
163  &yadif->cur->data[i][y * refs], w * df);
164  }
165  }
166  }
167 
168  emms_c();
169 }
170 
171 static int return_frame(AVFilterContext *ctx, int is_second)
172 {
173  YADIFContext *yadif = ctx->priv;
174  AVFilterLink *link = ctx->outputs[0];
175  int tff, ret;
176 
177  if (yadif->parity == -1) {
178  tff = yadif->cur->video->interlaced ?
179  yadif->cur->video->top_field_first : 1;
180  } else {
181  tff = yadif->parity ^ 1;
182  }
183 
184  if (is_second) {
185  yadif->out = ff_get_video_buffer(link, PERM_RWP, link->w, link->h);
186  if (!yadif->out)
187  return AVERROR(ENOMEM);
188 
189  avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
190  yadif->out->video->interlaced = 0;
191  }
192 
193  if (!yadif->csp)
194  yadif->csp = av_pix_fmt_desc_get(link->format);
195  if (yadif->csp->comp[0].depth_minus1 / 8 == 1)
196  yadif->filter_line = (void*)filter_line_c_16bit;
197 
198  filter(ctx, yadif->out, tff ^ !is_second, tff);
199 
200  if (is_second) {
201  int64_t cur_pts = yadif->cur->pts;
202  int64_t next_pts = yadif->next->pts;
203 
204  if (next_pts != AV_NOPTS_VALUE && cur_pts != AV_NOPTS_VALUE) {
205  yadif->out->pts = cur_pts + next_pts;
206  } else {
207  yadif->out->pts = AV_NOPTS_VALUE;
208  }
209  }
210  ret = ff_filter_frame(ctx->outputs[0], yadif->out);
211 
212  yadif->frame_pending = (yadif->mode&1) && !is_second;
213  return ret;
214 }
215 
216 static int filter_frame(AVFilterLink *link, AVFilterBufferRef *picref)
217 {
218  AVFilterContext *ctx = link->dst;
219  YADIFContext *yadif = ctx->priv;
220 
221  av_assert0(picref);
222 
223  if (yadif->frame_pending)
224  return_frame(ctx, 1);
225 
226  if (yadif->prev)
227  avfilter_unref_buffer(yadif->prev);
228  yadif->prev = yadif->cur;
229  yadif->cur = yadif->next;
230  yadif->next = picref;
231 
232  if (!yadif->cur)
233  return 0;
234 
235  if (yadif->deint && !yadif->cur->video->interlaced) {
236  yadif->out = avfilter_ref_buffer(yadif->cur, ~AV_PERM_WRITE);
237  if (!yadif->out)
238  return AVERROR(ENOMEM);
239 
240  avfilter_unref_bufferp(&yadif->prev);
241  if (yadif->out->pts != AV_NOPTS_VALUE)
242  yadif->out->pts *= 2;
243  return ff_filter_frame(ctx->outputs[0], yadif->out);
244  }
245 
246  if (!yadif->prev &&
247  !(yadif->prev = avfilter_ref_buffer(yadif->cur, ~AV_PERM_WRITE)))
248  return AVERROR(ENOMEM);
249 
250  yadif->out = ff_get_video_buffer(ctx->outputs[0], PERM_RWP,
251  link->w, link->h);
252  if (!yadif->out)
253  return AVERROR(ENOMEM);
254 
255  avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
256  yadif->out->video->interlaced = 0;
257 
258  if (yadif->out->pts != AV_NOPTS_VALUE)
259  yadif->out->pts *= 2;
260 
261  return return_frame(ctx, 0);
262 }
263 
264 static int request_frame(AVFilterLink *link)
265 {
266  AVFilterContext *ctx = link->src;
267  YADIFContext *yadif = ctx->priv;
268 
269  if (yadif->frame_pending) {
270  return_frame(ctx, 1);
271  return 0;
272  }
273 
274  do {
275  int ret;
276 
277  if (yadif->eof)
278  return AVERROR_EOF;
279 
280  ret = ff_request_frame(link->src->inputs[0]);
281 
282  if (ret == AVERROR_EOF && yadif->cur) {
284 
285  if (!next)
286  return AVERROR(ENOMEM);
287 
288  next->pts = yadif->next->pts * 2 - yadif->cur->pts;
289 
290  filter_frame(link->src->inputs[0], next);
291  yadif->eof = 1;
292  } else if (ret < 0) {
293  return ret;
294  }
295  } while (!yadif->cur);
296 
297  return 0;
298 }
299 
300 #define OFFSET(x) offsetof(YADIFContext, x)
301 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
302 
303 #define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, INT_MIN, INT_MAX, FLAGS, unit }
304 
305 static const AVOption yadif_options[] = {
306  { "mode", "specify the interlacing mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=YADIF_MODE_SEND_FRAME}, 0, 3, FLAGS, "mode"},
307  CONST("send_frame", "send one frame for each frame", YADIF_MODE_SEND_FRAME, "mode"),
308  CONST("send_field", "send one frame for each field", YADIF_MODE_SEND_FIELD, "mode"),
309  CONST("send_frame_nospatial", "send one frame for each frame, but skip spatial interlacing check", YADIF_MODE_SEND_FRAME_NOSPATIAL, "mode"),
310  CONST("send_field_nospatial", "send one frame for each field, but skip spatial interlacing check", YADIF_MODE_SEND_FIELD_NOSPATIAL, "mode"),
311 
312  { "parity", "specify the assumed picture field parity", OFFSET(parity), AV_OPT_TYPE_INT, {.i64=YADIF_PARITY_AUTO}, -1, 1, FLAGS, "parity" },
313  CONST("tff", "assume top field first", YADIF_PARITY_TFF, "parity"),
314  CONST("bff", "assume bottom field first", YADIF_PARITY_BFF, "parity"),
315  CONST("auto", "auto detect parity", YADIF_PARITY_AUTO, "parity"),
316 
317  { "deint", "specify which frames to deinterlace", OFFSET(deint), AV_OPT_TYPE_INT, {.i64=YADIF_DEINT_ALL}, 0, 1, FLAGS, "deint" },
318  CONST("all", "deinterlace all frames", YADIF_DEINT_ALL, "deint"),
319  CONST("interlaced", "only deinterlace frames marked as interlaced", YADIF_DEINT_INTERLACED, "deint"),
320 
321  {NULL},
322 };
323 
324 AVFILTER_DEFINE_CLASS(yadif);
325 
326 static av_cold void uninit(AVFilterContext *ctx)
327 {
328  YADIFContext *yadif = ctx->priv;
329 
330  avfilter_unref_bufferp(&yadif->prev);
331  avfilter_unref_bufferp(&yadif->cur );
332  avfilter_unref_bufferp(&yadif->next);
333  av_freep(&yadif->temp_line); yadif->temp_line_size = 0;
334  av_opt_free(yadif);
335 }
336 
338 {
339  static const enum AVPixelFormat pix_fmts[] = {
362  };
363 
365 
366  return 0;
367 }
368 
369 static av_cold int init(AVFilterContext *ctx, const char *args)
370 {
371  YADIFContext *yadif = ctx->priv;
372  static const char *shorthand[] = { "mode", "parity", "deint", NULL };
373  int ret;
374 
375  yadif->csp = NULL;
376 
377  yadif->class = &yadif_class;
378  av_opt_set_defaults(yadif);
379 
380  if ((ret = av_opt_set_from_string(yadif, args, shorthand, "=", ":")) < 0)
381  return ret;
382 
383  yadif->filter_line = filter_line_c;
384 
385  if (ARCH_X86)
386  ff_yadif_init_x86(yadif);
387 
388  av_log(ctx, AV_LOG_VERBOSE, "mode:%d parity:%d deint:%d\n",
389  yadif->mode, yadif->parity, yadif->deint);
390 
391  return 0;
392 }
393 
394 static int config_props(AVFilterLink *link)
395 {
396  AVFilterContext *ctx = link->src;
397  YADIFContext *yadif = ctx->priv;
398 
399  link->time_base.num = link->src->inputs[0]->time_base.num;
400  link->time_base.den = link->src->inputs[0]->time_base.den * 2;
401  link->w = link->src->inputs[0]->w;
402  link->h = link->src->inputs[0]->h;
403 
404  if(yadif->mode&1)
405  link->frame_rate = av_mul_q(link->src->inputs[0]->frame_rate, (AVRational){2,1});
406 
407  if (link->w < 3 || link->h < 3) {
408  av_log(ctx, AV_LOG_ERROR, "Video of less than 3 columns or lines is not supported\n");
409  return AVERROR(EINVAL);
410  }
411 
412  return 0;
413 }
414 
416  {
417  .name = "default",
418  .type = AVMEDIA_TYPE_VIDEO,
419  .filter_frame = filter_frame,
420  .min_perms = AV_PERM_PRESERVE,
421  },
422  { NULL }
423 };
424 
426  {
427  .name = "default",
428  .type = AVMEDIA_TYPE_VIDEO,
429  .request_frame = request_frame,
430  .config_props = config_props,
431  },
432  { NULL }
433 };
434 
436  .name = "yadif",
437  .description = NULL_IF_CONFIG_SMALL("Deinterlace the input image."),
438 
439  .priv_size = sizeof(YADIFContext),
440  .init = init,
441  .uninit = uninit,
443 
444  .inputs = avfilter_vf_yadif_inputs,
445  .outputs = avfilter_vf_yadif_outputs,
446 
447  .priv_class = &yadif_class,
448 };