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vf_idet.c
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1 /*
2  * Copyright (C) 2012 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <float.h> /* FLT_MAX */
22 
23 #include "libavutil/cpu.h"
24 #include "libavutil/common.h"
25 #include "libavutil/opt.h"
26 #include "internal.h"
27 #include "vf_idet.h"
28 
29 #define OFFSET(x) offsetof(IDETContext, x)
30 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
31 
32 static const AVOption idet_options[] = {
33  { "intl_thres", "set interlacing threshold", OFFSET(interlace_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.04}, -1, FLT_MAX, FLAGS },
34  { "prog_thres", "set progressive threshold", OFFSET(progressive_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.5}, -1, FLT_MAX, FLAGS },
35  { "rep_thres", "set repeat threshold", OFFSET(repeat_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 3.0}, -1, FLT_MAX, FLAGS },
36  { "half_life", "half life of cumulative statistics", OFFSET(half_life), AV_OPT_TYPE_FLOAT, {.dbl = 0.0}, -1, INT_MAX, FLAGS },
37  { NULL }
38 };
39 
41 
42 static const char *type2str(Type type)
43 {
44  switch(type) {
45  case TFF : return "tff";
46  case BFF : return "bff";
47  case PROGRESSIVE : return "progressive";
48  case UNDETERMINED : return "undetermined";
49  }
50  return NULL;
51 }
52 
53 #define PRECISION 1048576
54 
55 static uint64_t uintpow(uint64_t b,unsigned int e)
56 {
57  uint64_t r=1;
58  while(e--) r*=b;
59  return r;
60 }
61 
62 static int av_dict_set_fxp(AVDictionary **pm, const char *key, uint64_t value, unsigned int digits,
63  int flags)
64 {
65  char valuestr[44];
66  uint64_t print_precision = uintpow(10, digits);
67 
68  value = av_rescale(value, print_precision, PRECISION);
69 
70  snprintf(valuestr, sizeof(valuestr), "%"PRId64".%0*"PRId64,
71  value / print_precision, digits, value % print_precision);
72 
73  return av_dict_set(pm, key, valuestr, flags);
74 }
75 
76 static const char *rep2str(RepeatedField repeated_field)
77 {
78  switch(repeated_field) {
79  case REPEAT_NONE : return "neither";
80  case REPEAT_TOP : return "top";
81  case REPEAT_BOTTOM : return "bottom";
82  }
83  return NULL;
84 }
85 
86 int ff_idet_filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w)
87 {
88  int x;
89  int ret=0;
90 
91  for(x=0; x<w; x++){
92  int v = (*a++ + *c++) - 2 * *b++;
93  ret += FFABS(v);
94  }
95 
96  return ret;
97 }
98 
99 int ff_idet_filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w)
100 {
101  int x;
102  int ret=0;
103 
104  for(x=0; x<w; x++){
105  int v = (*a++ + *c++) - 2 * *b++;
106  ret += FFABS(v);
107  }
108 
109  return ret;
110 }
111 
112 static void filter(AVFilterContext *ctx)
113 {
114  IDETContext *idet = ctx->priv;
115  int y, i;
116  int64_t alpha[2]={0};
117  int64_t delta=0;
118  int64_t gamma[2]={0};
119  Type type, best_type;
120  RepeatedField repeat;
121  int match = 0;
122  AVDictionary **metadata = avpriv_frame_get_metadatap(idet->cur);
123 
124  for (i = 0; i < idet->csp->nb_components; i++) {
125  int w = idet->cur->width;
126  int h = idet->cur->height;
127  int refs = idet->cur->linesize[i];
128 
129  if (i && i<3) {
130  w = FF_CEIL_RSHIFT(w, idet->csp->log2_chroma_w);
131  h = FF_CEIL_RSHIFT(h, idet->csp->log2_chroma_h);
132  }
133 
134  for (y = 2; y < h - 2; y++) {
135  uint8_t *prev = &idet->prev->data[i][y*refs];
136  uint8_t *cur = &idet->cur ->data[i][y*refs];
137  uint8_t *next = &idet->next->data[i][y*refs];
138  alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w);
139  alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w);
140  delta += idet->filter_line(cur-refs, cur, cur+refs, w);
141  gamma[(y^1)&1] += idet->filter_line(cur , prev, cur , w);
142  }
143  }
144 
145  if (alpha[0] > idet->interlace_threshold * alpha[1]){
146  type = TFF;
147  }else if(alpha[1] > idet->interlace_threshold * alpha[0]){
148  type = BFF;
149  }else if(alpha[1] > idet->progressive_threshold * delta){
150  type = PROGRESSIVE;
151  }else{
152  type = UNDETERMINED;
153  }
154 
155  if ( gamma[0] > idet->repeat_threshold * gamma[1] ){
156  repeat = REPEAT_TOP;
157  } else if ( gamma[1] > idet->repeat_threshold * gamma[0] ){
158  repeat = REPEAT_BOTTOM;
159  } else {
160  repeat = REPEAT_NONE;
161  }
162 
163  memmove(idet->history+1, idet->history, HIST_SIZE-1);
164  idet->history[0] = type;
165  best_type = UNDETERMINED;
166  for(i=0; i<HIST_SIZE; i++){
167  if(idet->history[i] != UNDETERMINED){
168  if(best_type == UNDETERMINED)
169  best_type = idet->history[i];
170 
171  if(idet->history[i] == best_type) {
172  match++;
173  }else{
174  match=0;
175  break;
176  }
177  }
178  }
179  if(idet->last_type == UNDETERMINED){
180  if(match ) idet->last_type = best_type;
181  }else{
182  if(match>2) idet->last_type = best_type;
183  }
184 
185  if (idet->last_type == TFF){
186  idet->cur->top_field_first = 1;
187  idet->cur->interlaced_frame = 1;
188  }else if(idet->last_type == BFF){
189  idet->cur->top_field_first = 0;
190  idet->cur->interlaced_frame = 1;
191  }else if(idet->last_type == PROGRESSIVE){
192  idet->cur->interlaced_frame = 0;
193  }
194 
195  for(i=0; i<3; i++)
196  idet->repeats[i] = av_rescale(idet->repeats [i], idet->decay_coefficient, PRECISION);
197 
198  for(i=0; i<4; i++){
199  idet->prestat [i] = av_rescale(idet->prestat [i], idet->decay_coefficient, PRECISION);
200  idet->poststat[i] = av_rescale(idet->poststat[i], idet->decay_coefficient, PRECISION);
201  }
202 
203  idet->total_repeats [ repeat] ++;
204  idet->repeats [ repeat] += PRECISION;
205 
206  idet->total_prestat [ type] ++;
207  idet->prestat [ type] += PRECISION;
208 
209  idet->total_poststat[idet->last_type] ++;
210  idet->poststat [idet->last_type] += PRECISION;
211 
212  av_log(ctx, AV_LOG_DEBUG, "Repeated Field:%12s, Single frame:%12s, Multi frame:%12s\n",
213  rep2str(repeat), type2str(type), type2str(idet->last_type));
214 
215  av_dict_set (metadata, "lavfi.idet.repeated.current_frame", rep2str(repeat), 0);
216  av_dict_set_fxp(metadata, "lavfi.idet.repeated.neither", idet->repeats[REPEAT_NONE], 2, 0);
217  av_dict_set_fxp(metadata, "lavfi.idet.repeated.top", idet->repeats[REPEAT_TOP], 2, 0);
218  av_dict_set_fxp(metadata, "lavfi.idet.repeated.bottom", idet->repeats[REPEAT_BOTTOM], 2, 0);
219 
220  av_dict_set (metadata, "lavfi.idet.single.current_frame", type2str(type), 0);
221  av_dict_set_fxp(metadata, "lavfi.idet.single.tff", idet->prestat[TFF], 2 , 0);
222  av_dict_set_fxp(metadata, "lavfi.idet.single.bff", idet->prestat[BFF], 2, 0);
223  av_dict_set_fxp(metadata, "lavfi.idet.single.progressive", idet->prestat[PROGRESSIVE], 2, 0);
224  av_dict_set_fxp(metadata, "lavfi.idet.single.undetermined", idet->prestat[UNDETERMINED], 2, 0);
225 
226  av_dict_set (metadata, "lavfi.idet.multiple.current_frame", type2str(idet->last_type), 0);
227  av_dict_set_fxp(metadata, "lavfi.idet.multiple.tff", idet->poststat[TFF], 2, 0);
228  av_dict_set_fxp(metadata, "lavfi.idet.multiple.bff", idet->poststat[BFF], 2, 0);
229  av_dict_set_fxp(metadata, "lavfi.idet.multiple.progressive", idet->poststat[PROGRESSIVE], 2, 0);
230  av_dict_set_fxp(metadata, "lavfi.idet.multiple.undetermined", idet->poststat[UNDETERMINED], 2, 0);
231 }
232 
233 static int filter_frame(AVFilterLink *link, AVFrame *picref)
234 {
235  AVFilterContext *ctx = link->dst;
236  IDETContext *idet = ctx->priv;
237 
238  if (idet->prev)
239  av_frame_free(&idet->prev);
240  idet->prev = idet->cur;
241  idet->cur = idet->next;
242  idet->next = picref;
243 
244  if (!idet->cur)
245  return 0;
246 
247  if (!idet->prev)
248  idet->prev = av_frame_clone(idet->cur);
249 
250  if (!idet->csp)
251  idet->csp = av_pix_fmt_desc_get(link->format);
252  if (idet->csp->comp[0].depth_minus1 / 8 == 1){
254  if (ARCH_X86)
255  ff_idet_init_x86(idet, 1);
256  }
257 
258  filter(ctx);
259 
260  return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));
261 }
262 
263 static int request_frame(AVFilterLink *link)
264 {
265  AVFilterContext *ctx = link->src;
266  IDETContext *idet = ctx->priv;
267 
268  do {
269  int ret;
270 
271  if (idet->eof)
272  return AVERROR_EOF;
273 
274  ret = ff_request_frame(link->src->inputs[0]);
275 
276  if (ret == AVERROR_EOF && idet->cur) {
277  AVFrame *next = av_frame_clone(idet->next);
278 
279  if (!next)
280  return AVERROR(ENOMEM);
281 
282  filter_frame(link->src->inputs[0], next);
283  idet->eof = 1;
284  } else if (ret < 0) {
285  return ret;
286  }
287  } while (!idet->cur);
288 
289  return 0;
290 }
291 
292 static av_cold void uninit(AVFilterContext *ctx)
293 {
294  IDETContext *idet = ctx->priv;
295 
296  av_log(ctx, AV_LOG_INFO, "Repeated Fields: Neither:%6"PRId64" Top:%6"PRId64" Bottom:%6"PRId64"\n",
297  idet->total_repeats[REPEAT_NONE],
298  idet->total_repeats[REPEAT_TOP],
300  );
301  av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
302  idet->total_prestat[TFF],
303  idet->total_prestat[BFF],
304  idet->total_prestat[PROGRESSIVE],
306  );
307  av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
308  idet->total_poststat[TFF],
309  idet->total_poststat[BFF],
312  );
313 
314  av_frame_free(&idet->prev);
315  av_frame_free(&idet->cur );
316  av_frame_free(&idet->next);
317 }
318 
320 {
321  static const enum AVPixelFormat pix_fmts[] = {
342  };
343 
345 
346  return 0;
347 }
348 
349 static int config_output(AVFilterLink *outlink)
350 {
351  outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
352  return 0;
353 }
354 
355 static av_cold int init(AVFilterContext *ctx)
356 {
357  IDETContext *idet = ctx->priv;
358 
359  idet->eof = 0;
360  idet->last_type = UNDETERMINED;
361  memset(idet->history, UNDETERMINED, HIST_SIZE);
362 
363  if( idet->half_life > 0 )
364  idet->decay_coefficient = (uint64_t) round( PRECISION * exp2(-1.0 / idet->half_life) );
365  else
367 
369 
370  if (ARCH_X86)
371  ff_idet_init_x86(idet, 0);
372 
373  return 0;
374 }
375 
376 static const AVFilterPad idet_inputs[] = {
377  {
378  .name = "default",
379  .type = AVMEDIA_TYPE_VIDEO,
380  .filter_frame = filter_frame,
381  },
382  { NULL }
383 };
384 
385 static const AVFilterPad idet_outputs[] = {
386  {
387  .name = "default",
388  .type = AVMEDIA_TYPE_VIDEO,
389  .config_props = config_output,
390  .request_frame = request_frame
391  },
392  { NULL }
393 };
394 
396  .name = "idet",
397  .description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
398  .priv_size = sizeof(IDETContext),
399  .init = init,
400  .uninit = uninit,
402  .inputs = idet_inputs,
403  .outputs = idet_outputs,
404  .priv_class = &idet_class,
405 };