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path: root/libavfilter/vf_idet.c (plain)
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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
32static 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 { "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 },
38 { NULL }
39};
40
41AVFILTER_DEFINE_CLASS(idet);
42
43static const char *type2str(Type type)
44{
45 switch(type) {
46 case TFF : return "tff";
47 case BFF : return "bff";
48 case PROGRESSIVE : return "progressive";
49 case UNDETERMINED : return "undetermined";
50 }
51 return NULL;
52}
53
54#define PRECISION 1048576
55
56static uint64_t uintpow(uint64_t b,unsigned int e)
57{
58 uint64_t r=1;
59 while(e--) r*=b;
60 return r;
61}
62
63static int av_dict_set_fxp(AVDictionary **pm, const char *key, uint64_t value, unsigned int digits,
64 int flags)
65{
66 char valuestr[44];
67 uint64_t print_precision = uintpow(10, digits);
68
69 value = av_rescale(value, print_precision, PRECISION);
70
71 snprintf(valuestr, sizeof(valuestr), "%"PRId64".%0*"PRId64,
72 value / print_precision, digits, value % print_precision);
73
74 return av_dict_set(pm, key, valuestr, flags);
75}
76
77static const char *rep2str(RepeatedField repeated_field)
78{
79 switch(repeated_field) {
80 case REPEAT_NONE : return "neither";
81 case REPEAT_TOP : return "top";
82 case REPEAT_BOTTOM : return "bottom";
83 }
84 return NULL;
85}
86
87int ff_idet_filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w)
88{
89 int x;
90 int ret=0;
91
92 for(x=0; x<w; x++){
93 int v = (*a++ + *c++) - 2 * *b++;
94 ret += FFABS(v);
95 }
96
97 return ret;
98}
99
100int ff_idet_filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w)
101{
102 int x;
103 int ret=0;
104
105 for(x=0; x<w; x++){
106 int v = (*a++ + *c++) - 2 * *b++;
107 ret += FFABS(v);
108 }
109
110 return ret;
111}
112
113static void filter(AVFilterContext *ctx)
114{
115 IDETContext *idet = ctx->priv;
116 int y, i;
117 int64_t alpha[2]={0};
118 int64_t delta=0;
119 int64_t gamma[2]={0};
120 Type type, best_type;
121 RepeatedField repeat;
122 int match = 0;
123 AVDictionary **metadata = avpriv_frame_get_metadatap(idet->cur);
124
125 for (i = 0; i < idet->csp->nb_components; i++) {
126 int w = idet->cur->width;
127 int h = idet->cur->height;
128 int refs = idet->cur->linesize[i];
129
130 if (i && i<3) {
131 w = AV_CEIL_RSHIFT(w, idet->csp->log2_chroma_w);
132 h = AV_CEIL_RSHIFT(h, idet->csp->log2_chroma_h);
133 }
134
135 for (y = 2; y < h - 2; y++) {
136 uint8_t *prev = &idet->prev->data[i][y*refs];
137 uint8_t *cur = &idet->cur ->data[i][y*refs];
138 uint8_t *next = &idet->next->data[i][y*refs];
139 alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w);
140 alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w);
141 delta += idet->filter_line(cur-refs, cur, cur+refs, w);
142 gamma[(y^1)&1] += idet->filter_line(cur , prev, cur , w);
143 }
144 }
145
146 if (alpha[0] > idet->interlace_threshold * alpha[1]){
147 type = TFF;
148 }else if(alpha[1] > idet->interlace_threshold * alpha[0]){
149 type = BFF;
150 }else if(alpha[1] > idet->progressive_threshold * delta){
151 type = PROGRESSIVE;
152 }else{
153 type = UNDETERMINED;
154 }
155
156 if ( gamma[0] > idet->repeat_threshold * gamma[1] ){
157 repeat = REPEAT_TOP;
158 } else if ( gamma[1] > idet->repeat_threshold * gamma[0] ){
159 repeat = REPEAT_BOTTOM;
160 } else {
161 repeat = REPEAT_NONE;
162 }
163
164 memmove(idet->history+1, idet->history, HIST_SIZE-1);
165 idet->history[0] = type;
166 best_type = UNDETERMINED;
167 for(i=0; i<HIST_SIZE; i++){
168 if(idet->history[i] != UNDETERMINED){
169 if(best_type == UNDETERMINED)
170 best_type = idet->history[i];
171
172 if(idet->history[i] == best_type) {
173 match++;
174 }else{
175 match=0;
176 break;
177 }
178 }
179 }
180 if(idet->last_type == UNDETERMINED){
181 if(match ) idet->last_type = best_type;
182 }else{
183 if(match>2) idet->last_type = best_type;
184 }
185
186 if (idet->last_type == TFF){
187 idet->cur->top_field_first = 1;
188 idet->cur->interlaced_frame = 1;
189 }else if(idet->last_type == BFF){
190 idet->cur->top_field_first = 0;
191 idet->cur->interlaced_frame = 1;
192 }else if(idet->last_type == PROGRESSIVE){
193 idet->cur->interlaced_frame = 0;
194 }
195
196 for(i=0; i<3; i++)
197 idet->repeats[i] = av_rescale(idet->repeats [i], idet->decay_coefficient, PRECISION);
198
199 for(i=0; i<4; i++){
200 idet->prestat [i] = av_rescale(idet->prestat [i], idet->decay_coefficient, PRECISION);
201 idet->poststat[i] = av_rescale(idet->poststat[i], idet->decay_coefficient, PRECISION);
202 }
203
204 idet->total_repeats [ repeat] ++;
205 idet->repeats [ repeat] += PRECISION;
206
207 idet->total_prestat [ type] ++;
208 idet->prestat [ type] += PRECISION;
209
210 idet->total_poststat[idet->last_type] ++;
211 idet->poststat [idet->last_type] += PRECISION;
212
213 av_log(ctx, AV_LOG_DEBUG, "Repeated Field:%12s, Single frame:%12s, Multi frame:%12s\n",
214 rep2str(repeat), type2str(type), type2str(idet->last_type));
215
216 av_dict_set (metadata, "lavfi.idet.repeated.current_frame", rep2str(repeat), 0);
217 av_dict_set_fxp(metadata, "lavfi.idet.repeated.neither", idet->repeats[REPEAT_NONE], 2, 0);
218 av_dict_set_fxp(metadata, "lavfi.idet.repeated.top", idet->repeats[REPEAT_TOP], 2, 0);
219 av_dict_set_fxp(metadata, "lavfi.idet.repeated.bottom", idet->repeats[REPEAT_BOTTOM], 2, 0);
220
221 av_dict_set (metadata, "lavfi.idet.single.current_frame", type2str(type), 0);
222 av_dict_set_fxp(metadata, "lavfi.idet.single.tff", idet->prestat[TFF], 2 , 0);
223 av_dict_set_fxp(metadata, "lavfi.idet.single.bff", idet->prestat[BFF], 2, 0);
224 av_dict_set_fxp(metadata, "lavfi.idet.single.progressive", idet->prestat[PROGRESSIVE], 2, 0);
225 av_dict_set_fxp(metadata, "lavfi.idet.single.undetermined", idet->prestat[UNDETERMINED], 2, 0);
226
227 av_dict_set (metadata, "lavfi.idet.multiple.current_frame", type2str(idet->last_type), 0);
228 av_dict_set_fxp(metadata, "lavfi.idet.multiple.tff", idet->poststat[TFF], 2, 0);
229 av_dict_set_fxp(metadata, "lavfi.idet.multiple.bff", idet->poststat[BFF], 2, 0);
230 av_dict_set_fxp(metadata, "lavfi.idet.multiple.progressive", idet->poststat[PROGRESSIVE], 2, 0);
231 av_dict_set_fxp(metadata, "lavfi.idet.multiple.undetermined", idet->poststat[UNDETERMINED], 2, 0);
232}
233
234static int filter_frame(AVFilterLink *link, AVFrame *picref)
235{
236 AVFilterContext *ctx = link->dst;
237 IDETContext *idet = ctx->priv;
238
239 // initial frame(s) and not interlaced, just pass through for
240 // the analyze_interlaced_flag mode
241 if (idet->analyze_interlaced_flag &&
242 !picref->interlaced_frame &&
243 !idet->next) {
244 return ff_filter_frame(ctx->outputs[0], picref);
245 }
246 if (idet->analyze_interlaced_flag_done) {
247 if (picref->interlaced_frame && idet->interlaced_flag_accuracy < 0)
248 picref->interlaced_frame = 0;
249 return ff_filter_frame(ctx->outputs[0], picref);
250 }
251
252 av_frame_free(&idet->prev);
253
254 if( picref->width != link->w
255 || picref->height != link->h
256 || picref->format != link->format) {
257 link->dst->inputs[0]->format = picref->format;
258 link->dst->inputs[0]->w = picref->width;
259 link->dst->inputs[0]->h = picref->height;
260
261 av_frame_free(&idet->cur );
262 av_frame_free(&idet->next);
263 }
264
265 idet->prev = idet->cur;
266 idet->cur = idet->next;
267 idet->next = picref;
268
269 if (!idet->cur &&
270 !(idet->cur = av_frame_clone(idet->next)))
271 return AVERROR(ENOMEM);
272
273 if (!idet->prev)
274 return 0;
275
276 if (!idet->csp)
277 idet->csp = av_pix_fmt_desc_get(link->format);
278 if (idet->csp->comp[0].depth > 8){
279 idet->filter_line = (ff_idet_filter_func)ff_idet_filter_line_c_16bit;
280 if (ARCH_X86)
281 ff_idet_init_x86(idet, 1);
282 }
283
284 if (idet->analyze_interlaced_flag) {
285 if (idet->cur->interlaced_frame) {
286 idet->cur->interlaced_frame = 0;
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->interlaced_frame && idet->interlaced_flag_accuracy < 0)
299 idet->next->interlaced_frame = 0;
300 idet->analyze_interlaced_flag_done = 1;
301 av_log(ctx, AV_LOG_INFO, "Final flag accuracy %d\n", idet->interlaced_flag_accuracy);
302 return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->next));
303 }
304 }
305 } else {
306 filter(ctx);
307 }
308
309 return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));
310}
311
312static int request_frame(AVFilterLink *link)
313{
314 AVFilterContext *ctx = link->src;
315 IDETContext *idet = ctx->priv;
316 int ret;
317
318 if (idet->eof)
319 return AVERROR_EOF;
320
321 ret = ff_request_frame(link->src->inputs[0]);
322
323 if (ret == AVERROR_EOF && idet->cur && !idet->analyze_interlaced_flag_done) {
324 AVFrame *next = av_frame_clone(idet->next);
325
326 if (!next)
327 return AVERROR(ENOMEM);
328
329 ret = filter_frame(link->src->inputs[0], next);
330 idet->eof = 1;
331 }
332
333 return ret;
334}
335
336static av_cold void uninit(AVFilterContext *ctx)
337{
338 IDETContext *idet = ctx->priv;
339 int level = strncmp(ctx->name, "auto-inserted", 13) ? AV_LOG_INFO : AV_LOG_DEBUG;
340
341 av_log(ctx, level, "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 av_log(ctx, level, "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 av_log(ctx, level, "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 av_frame_free(&idet->prev);
360 av_frame_free(&idet->cur );
361 av_frame_free(&idet->next);
362}
363
364static int query_formats(AVFilterContext *ctx)
365{
366 static const enum AVPixelFormat pix_fmts[] = {
367 AV_PIX_FMT_YUV420P,
368 AV_PIX_FMT_YUV422P,
369 AV_PIX_FMT_YUV444P,
370 AV_PIX_FMT_YUV410P,
371 AV_PIX_FMT_YUV411P,
372 AV_PIX_FMT_GRAY8,
373 AV_PIX_FMT_YUVJ420P,
374 AV_PIX_FMT_YUVJ422P,
375 AV_PIX_FMT_YUVJ444P,
376 AV_PIX_FMT_GRAY16,
377 AV_PIX_FMT_YUV440P,
378 AV_PIX_FMT_YUVJ440P,
379 AV_PIX_FMT_YUV420P9,
380 AV_PIX_FMT_YUV422P9,
381 AV_PIX_FMT_YUV444P9,
382 AV_PIX_FMT_YUV420P10,
383 AV_PIX_FMT_YUV422P10,
384 AV_PIX_FMT_YUV444P10,
385 AV_PIX_FMT_YUV420P12,
386 AV_PIX_FMT_YUV422P12,
387 AV_PIX_FMT_YUV444P12,
388 AV_PIX_FMT_YUV420P14,
389 AV_PIX_FMT_YUV422P14,
390 AV_PIX_FMT_YUV444P14,
391 AV_PIX_FMT_YUV420P16,
392 AV_PIX_FMT_YUV422P16,
393 AV_PIX_FMT_YUV444P16,
394 AV_PIX_FMT_YUVA420P,
395 AV_PIX_FMT_NONE
396 };
397 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
398 if (!fmts_list)
399 return AVERROR(ENOMEM);
400 return ff_set_common_formats(ctx, fmts_list);
401}
402
403static av_cold int init(AVFilterContext *ctx)
404{
405 IDETContext *idet = ctx->priv;
406
407 idet->eof = 0;
408 idet->last_type = UNDETERMINED;
409 memset(idet->history, UNDETERMINED, HIST_SIZE);
410
411 if( idet->half_life > 0 )
412 idet->decay_coefficient = lrint( PRECISION * exp2(-1.0 / idet->half_life) );
413 else
414 idet->decay_coefficient = PRECISION;
415
416 idet->filter_line = ff_idet_filter_line_c;
417
418 if (ARCH_X86)
419 ff_idet_init_x86(idet, 0);
420
421 return 0;
422}
423
424static const AVFilterPad idet_inputs[] = {
425 {
426 .name = "default",
427 .type = AVMEDIA_TYPE_VIDEO,
428 .filter_frame = filter_frame,
429 },
430 { NULL }
431};
432
433static const AVFilterPad idet_outputs[] = {
434 {
435 .name = "default",
436 .type = AVMEDIA_TYPE_VIDEO,
437 .request_frame = request_frame
438 },
439 { NULL }
440};
441
442AVFilter ff_vf_idet = {
443 .name = "idet",
444 .description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
445 .priv_size = sizeof(IDETContext),
446 .init = init,
447 .uninit = uninit,
448 .query_formats = query_formats,
449 .inputs = idet_inputs,
450 .outputs = idet_outputs,
451 .priv_class = &idet_class,
452};
453
generated by cgit at 2024-05-17 06:09:51 (GMT)