FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_idet.c
Date: 2025-04-25 22:50:00
Exec Total Coverage
Lines: 141 201 70.1%
Functions: 10 11 90.9%
Branches: 54 111 48.6%
Line Branch Exec Source
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/common.h"
24 #include "libavutil/opt.h"
25 #include "filters.h"
26 #include "vf_idet.h"
27
28 #define OFFSET(x) offsetof(IDETContext, x)
29 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
30
31 static const AVOption idet_options[] = {
32 { "intl_thres", "set interlacing threshold", OFFSET(interlace_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.04}, -1, FLT_MAX, FLAGS },
33 { "prog_thres", "set progressive threshold", OFFSET(progressive_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.5}, -1, FLT_MAX, FLAGS },
34 { "rep_thres", "set repeat threshold", OFFSET(repeat_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 3.0}, -1, FLT_MAX, FLAGS },
35 { "half_life", "half life of cumulative statistics", OFFSET(half_life), AV_OPT_TYPE_FLOAT, {.dbl = 0.0}, -1, INT_MAX, FLAGS },
36 { "analyze_interlaced_flag", "set number of frames to use to determine if the interlace flag is accurate", OFFSET(analyze_interlaced_flag), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, FLAGS },
37 { NULL }
38 };
39
40 AVFILTER_DEFINE_CLASS(idet);
41
42 100 static const char *type2str(Type type)
43 {
44
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 100 switch(type) {
45 ✗ case TFF : return "tff";
46 ✗ case BFF : return "bff";
47 98 case PROGRESSIVE : return "progressive";
48 2 case UNDETERMINED : return "undetermined";
49 }
50 ✗ return NULL;
51 }
52
53 #define PRECISION 1048576
54
55 275 static uint64_t uintpow(uint64_t b,unsigned int e)
56 {
57 275 uint64_t r=1;
58
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 825 while(e--) r*=b;
59 275 return r;
60 }
61
62 275 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];
66 275 uint64_t print_precision = uintpow(10, digits);
67
68 275 value = av_rescale(value, print_precision, PRECISION);
69
70 275 snprintf(valuestr, sizeof(valuestr), "%"PRId64".%0*"PRId64,
71 value / print_precision, digits, value % print_precision);
72
73 275 return av_dict_set(pm, key, valuestr, flags);
74 }
75
76 50 static const char *rep2str(RepeatedField repeated_field)
77 {
78
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 50 switch(repeated_field) {
79 50 case REPEAT_NONE : return "neither";
80 ✗ case REPEAT_TOP : return "top";
81 ✗ case REPEAT_BOTTOM : return "bottom";
82 }
83 ✗ return NULL;
84 }
85
86 42800 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 42800 int ret=0;
90
91
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 15108400 for(x=0; x<w; x++){
92 15065600 int v = (*a++ + *c++) - 2 * *b++;
93 15065600 ret += FFABS(v);
94 }
95
96 42800 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 25 static void filter(AVFilterContext *ctx)
113 {
114 25 IDETContext *idet = ctx->priv;
115 int y, i;
116 25 int64_t alpha[2]={0};
117 25 int64_t delta=0;
118 25 int64_t gamma[2]={0};
119 Type type, best_type;
120 RepeatedField repeat;
121 25 int match = 0;
122 25 AVDictionary **metadata = &idet->cur->metadata;
123
124
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 50 for (i = 0; i < idet->csp->nb_components; i++) {
125 25 int w = idet->cur->width;
126 25 int h = idet->cur->height;
127 25 int refs = idet->cur->linesize[i];
128
129
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 25 if (i && i<3) {
130 ✗ w = AV_CEIL_RSHIFT(w, idet->csp->log2_chroma_w);
131 ✗ h = AV_CEIL_RSHIFT(h, idet->csp->log2_chroma_h);
132 }
133
134
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 10725 for (y = 2; y < h - 2; y++) {
135 10700 uint8_t *prev = &idet->prev->data[i][y*refs];
136 10700 uint8_t *cur = &idet->cur ->data[i][y*refs];
137 10700 uint8_t *next = &idet->next->data[i][y*refs];
138 10700 alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w);
139 10700 alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w);
140 10700 delta += idet->filter_line(cur-refs, cur, cur+refs, w);
141 10700 gamma[(y^1)&1] += idet->filter_line(cur , prev, cur , w);
142 }
143 }
144
145
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 25 if (alpha[0] > idet->interlace_threshold * alpha[1]){
146 ✗ type = TFF;
147
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 25 }else if(alpha[1] > idet->interlace_threshold * alpha[0]){
148 ✗ type = BFF;
149
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 25 }else if(alpha[1] > idet->progressive_threshold * delta){
150 24 type = PROGRESSIVE;
151 }else{
152 1 type = UNDETERMINED;
153 }
154
155
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 25 if ( gamma[0] > idet->repeat_threshold * gamma[1] ){
156 ✗ repeat = REPEAT_TOP;
157
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 25 } else if ( gamma[1] > idet->repeat_threshold * gamma[0] ){
158 ✗ repeat = REPEAT_BOTTOM;
159 } else {
160 25 repeat = REPEAT_NONE;
161 }
162
163 25 memmove(idet->history+1, idet->history, HIST_SIZE-1);
164 25 idet->history[0] = type;
165 25 best_type = UNDETERMINED;
166
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 125 for(i=0; i<HIST_SIZE; i++){
167
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 100 if(idet->history[i] != UNDETERMINED){
168
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 92 if(best_type == UNDETERMINED)
169 25 best_type = idet->history[i];
170
171
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 92 if(idet->history[i] == best_type) {
172 92 match++;
173 }else{
174 ✗ match=0;
175 ✗ break;
176 }
177 }
178 }
179
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 25 if(idet->last_type == UNDETERMINED){
180
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 1 if(match ) idet->last_type = best_type;
181 }else{
182
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 24 if(match>2) idet->last_type = best_type;
183 }
184
185
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 25 if (idet->last_type == TFF){
186 ✗ idet->cur->flags |= (AV_FRAME_FLAG_INTERLACED | AV_FRAME_FLAG_TOP_FIELD_FIRST);
187
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 25 }else if(idet->last_type == BFF){
188 ✗ idet->cur->flags &= ~AV_FRAME_FLAG_TOP_FIELD_FIRST;
189 ✗ idet->cur->flags |= AV_FRAME_FLAG_INTERLACED;
190
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 25 }else if(idet->last_type == PROGRESSIVE){
191 25 idet->cur->flags &= ~AV_FRAME_FLAG_INTERLACED;
192 }
193
194
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 100 for(i=0; i<3; i++)
195 75 idet->repeats[i] = av_rescale(idet->repeats [i], idet->decay_coefficient, PRECISION);
196
197
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 125 for(i=0; i<4; i++){
198 100 idet->prestat [i] = av_rescale(idet->prestat [i], idet->decay_coefficient, PRECISION);
199 100 idet->poststat[i] = av_rescale(idet->poststat[i], idet->decay_coefficient, PRECISION);
200 }
201
202 25 idet->total_repeats [ repeat] ++;
203 25 idet->repeats [ repeat] += PRECISION;
204
205 25 idet->total_prestat [ type] ++;
206 25 idet->prestat [ type] += PRECISION;
207
208 25 idet->total_poststat[idet->last_type] ++;
209 25 idet->poststat [idet->last_type] += PRECISION;
210
211 25 av_log(ctx, AV_LOG_DEBUG, "Repeated Field:%12s, Single frame:%12s, Multi frame:%12s\n",
212 rep2str(repeat), type2str(type), type2str(idet->last_type));
213
214 25 av_dict_set (metadata, "lavfi.idet.repeated.current_frame", rep2str(repeat), 0);
215 25 av_dict_set_fxp(metadata, "lavfi.idet.repeated.neither", idet->repeats[REPEAT_NONE], 2, 0);
216 25 av_dict_set_fxp(metadata, "lavfi.idet.repeated.top", idet->repeats[REPEAT_TOP], 2, 0);
217 25 av_dict_set_fxp(metadata, "lavfi.idet.repeated.bottom", idet->repeats[REPEAT_BOTTOM], 2, 0);
218
219 25 av_dict_set (metadata, "lavfi.idet.single.current_frame", type2str(type), 0);
220 25 av_dict_set_fxp(metadata, "lavfi.idet.single.tff", idet->prestat[TFF], 2 , 0);
221 25 av_dict_set_fxp(metadata, "lavfi.idet.single.bff", idet->prestat[BFF], 2, 0);
222 25 av_dict_set_fxp(metadata, "lavfi.idet.single.progressive", idet->prestat[PROGRESSIVE], 2, 0);
223 25 av_dict_set_fxp(metadata, "lavfi.idet.single.undetermined", idet->prestat[UNDETERMINED], 2, 0);
224
225 25 av_dict_set (metadata, "lavfi.idet.multiple.current_frame", type2str(idet->last_type), 0);
226 25 av_dict_set_fxp(metadata, "lavfi.idet.multiple.tff", idet->poststat[TFF], 2, 0);
227 25 av_dict_set_fxp(metadata, "lavfi.idet.multiple.bff", idet->poststat[BFF], 2, 0);
228 25 av_dict_set_fxp(metadata, "lavfi.idet.multiple.progressive", idet->poststat[PROGRESSIVE], 2, 0);
229 25 av_dict_set_fxp(metadata, "lavfi.idet.multiple.undetermined", idet->poststat[UNDETERMINED], 2, 0);
230 25 }
231
232 26 static int filter_frame(AVFilterLink *link, AVFrame *picref)
233 {
234 26 AVFilterContext *ctx = link->dst;
235 26 IDETContext *idet = ctx->priv;
236
237 // initial frame(s) and not interlaced, just pass through for
238 // the analyze_interlaced_flag mode
239
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 26 if (idet->analyze_interlaced_flag &&
240 ✗ !(picref->flags & AV_FRAME_FLAG_INTERLACED) &&
241 ✗ !idet->next) {
242 ✗ return ff_filter_frame(ctx->outputs[0], picref);
243 }
244
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 26 if (idet->analyze_interlaced_flag_done) {
245 ✗ if ((picref->flags & AV_FRAME_FLAG_INTERLACED) && idet->interlaced_flag_accuracy < 0) {
246 ✗ picref->flags &= ~AV_FRAME_FLAG_INTERLACED;
247 }
248 ✗ return ff_filter_frame(ctx->outputs[0], picref);
249 }
250
251 26 av_frame_free(&idet->prev);
252
253
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 26 if( picref->width != link->w
254
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 26 || picref->height != link->h
255
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 26 || picref->format != link->format) {
256 ✗ link->dst->inputs[0]->format = picref->format;
257 ✗ link->dst->inputs[0]->w = picref->width;
258 ✗ link->dst->inputs[0]->h = picref->height;
259
260 ✗ av_frame_free(&idet->cur );
261 ✗ av_frame_free(&idet->next);
262 }
263
264 26 idet->prev = idet->cur;
265 26 idet->cur = idet->next;
266 26 idet->next = picref;
267
268
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 26 if (!idet->cur &&
269
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 1 !(idet->cur = av_frame_clone(idet->next)))
270 ✗ return AVERROR(ENOMEM);
271
272
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 26 if (!idet->prev)
273 1 return 0;
274
275
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 25 if (!idet->csp)
276 1 idet->csp = av_pix_fmt_desc_get(link->format);
277
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 25 if (idet->csp->comp[0].depth > 8){
278 ✗ idet->filter_line = (ff_idet_filter_func)ff_idet_filter_line_c_16bit;
279 #if ARCH_X86
280 ✗ ff_idet_init_x86(idet, 1);
281 #endif
282 }
283
284
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 25 if (idet->analyze_interlaced_flag) {
285 ✗ if (idet->cur->flags & AV_FRAME_FLAG_INTERLACED) {
286 ✗ idet->cur->flags &= ~AV_FRAME_FLAG_INTERLACED;
287 ✗ filter(ctx);
288 ✗ if (idet->last_type == PROGRESSIVE) {
289 ✗ idet->interlaced_flag_accuracy --;
290 ✗ idet->analyze_interlaced_flag --;
291 ✗ } else if (idet->last_type != UNDETERMINED) {
292 ✗ idet->interlaced_flag_accuracy ++;
293 ✗ idet->analyze_interlaced_flag --;
294 }
295 ✗ if (idet->analyze_interlaced_flag == 1) {
296 ✗ ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));
297
298 ✗ if ((idet->next->flags & AV_FRAME_FLAG_INTERLACED) && idet->interlaced_flag_accuracy < 0) {
299 ✗ idet->next->flags &= ~AV_FRAME_FLAG_INTERLACED;
300 }
301 ✗ idet->analyze_interlaced_flag_done = 1;
302 ✗ av_log(ctx, AV_LOG_INFO, "Final flag accuracy %d\n", idet->interlaced_flag_accuracy);
303 ✗ return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->next));
304 }
305 }
306 } else {
307 25 filter(ctx);
308 }
309
310 25 return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));
311 }
312
313 25 static int request_frame(AVFilterLink *link)
314 {
315 25 AVFilterContext *ctx = link->src;
316 25 IDETContext *idet = ctx->priv;
317 int ret;
318
319
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 25 if (idet->eof)
320 ✗ return AVERROR_EOF;
321
322 25 ret = ff_request_frame(link->src->inputs[0]);
323
324
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 25 if (ret == AVERROR_EOF && idet->cur && !idet->analyze_interlaced_flag_done) {
325 ✗ AVFrame *next = av_frame_clone(idet->next);
326
327 ✗ if (!next)
328 ✗ return AVERROR(ENOMEM);
329
330 ✗ ret = filter_frame(link->src->inputs[0], next);
331 ✗ idet->eof = 1;
332 }
333
334 25 return ret;
335 }
336
337 2 static av_cold void uninit(AVFilterContext *ctx)
338 {
339 2 IDETContext *idet = ctx->priv;
340
341 2 av_log(ctx, AV_LOG_INFO, "Repeated Fields: Neither:%6"PRId64" Top:%6"PRId64" Bottom:%6"PRId64"\n",
342 idet->total_repeats[REPEAT_NONE],
343 idet->total_repeats[REPEAT_TOP],
344 idet->total_repeats[REPEAT_BOTTOM]
345 );
346 2 av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
347 idet->total_prestat[TFF],
348 idet->total_prestat[BFF],
349 idet->total_prestat[PROGRESSIVE],
350 idet->total_prestat[UNDETERMINED]
351 );
352 2 av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
353 idet->total_poststat[TFF],
354 idet->total_poststat[BFF],
355 idet->total_poststat[PROGRESSIVE],
356 idet->total_poststat[UNDETERMINED]
357 );
358
359 2 av_frame_free(&idet->prev);
360 2 av_frame_free(&idet->cur );
361 2 av_frame_free(&idet->next);
362 2 }
363
364 static const enum AVPixelFormat pix_fmts[] = {
365 AV_PIX_FMT_YUV420P,
366 AV_PIX_FMT_YUV422P,
367 AV_PIX_FMT_YUV444P,
368 AV_PIX_FMT_YUV410P,
369 AV_PIX_FMT_YUV411P,
370 AV_PIX_FMT_GRAY8,
371 AV_PIX_FMT_YUVJ420P,
372 AV_PIX_FMT_YUVJ422P,
373 AV_PIX_FMT_YUVJ444P,
374 AV_PIX_FMT_GRAY16,
375 AV_PIX_FMT_YUV440P,
376 AV_PIX_FMT_YUVJ440P,
377 AV_PIX_FMT_YUV420P9,
378 AV_PIX_FMT_YUV422P9,
379 AV_PIX_FMT_YUV444P9,
380 AV_PIX_FMT_YUV420P10,
381 AV_PIX_FMT_YUV422P10,
382 AV_PIX_FMT_YUV444P10,
383 AV_PIX_FMT_YUV420P12,
384 AV_PIX_FMT_YUV422P12,
385 AV_PIX_FMT_YUV444P12,
386 AV_PIX_FMT_YUV420P14,
387 AV_PIX_FMT_YUV422P14,
388 AV_PIX_FMT_YUV444P14,
389 AV_PIX_FMT_YUV420P16,
390 AV_PIX_FMT_YUV422P16,
391 AV_PIX_FMT_YUV444P16,
392 AV_PIX_FMT_YUVA420P,
393 AV_PIX_FMT_YUVA422P,
394 AV_PIX_FMT_YUVA444P,
395 AV_PIX_FMT_NONE
396 };
397
398 2 static av_cold int init(AVFilterContext *ctx)
399 {
400 2 IDETContext *idet = ctx->priv;
401
402 2 idet->eof = 0;
403 2 idet->last_type = UNDETERMINED;
404 2 memset(idet->history, UNDETERMINED, HIST_SIZE);
405
406
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 2 if( idet->half_life > 0 )
407 ✗ idet->decay_coefficient = lrint( PRECISION * exp2(-1.0 / idet->half_life) );
408 else
409 2 idet->decay_coefficient = PRECISION;
410
411 2 idet->filter_line = ff_idet_filter_line_c;
412
413 #if ARCH_X86
414 2 ff_idet_init_x86(idet, 0);
415 #endif
416
417 2 return 0;
418 }
419
420 static const AVFilterPad idet_inputs[] = {
421 {
422 .name = "default",
423 .type = AVMEDIA_TYPE_VIDEO,
424 .filter_frame = filter_frame,
425 },
426 };
427
428 static const AVFilterPad idet_outputs[] = {
429 {
430 .name = "default",
431 .type = AVMEDIA_TYPE_VIDEO,
432 .request_frame = request_frame
433 },
434 };
435
436 const FFFilter ff_vf_idet = {
437 .p.name = "idet",
438 .p.description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
439 .p.flags = AVFILTER_FLAG_METADATA_ONLY,
440 .p.priv_class = &idet_class,
441 .priv_size = sizeof(IDETContext),
442 .init = init,
443 .uninit = uninit,
444 FILTER_INPUTS(idet_inputs),
445 FILTER_OUTPUTS(idet_outputs),
446 FILTER_PIXFMTS_ARRAY(pix_fmts),
447 };
448