aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/vf_idet.c
blob: abd375230aaea46d4d96c0fcc990e58837f97db8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
/*
 * Copyright (C) 2012 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <float.h> /* FLT_MAX */

#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "vf_idet.h"

#define OFFSET(x) offsetof(IDETContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

static const AVOption idet_options[] = {
    { "intl_thres", "set interlacing threshold", OFFSET(interlace_threshold),   AV_OPT_TYPE_FLOAT, {.dbl = 1.04}, -1, FLT_MAX, FLAGS },
    { "prog_thres", "set progressive threshold", OFFSET(progressive_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.5},  -1, FLT_MAX, FLAGS },
    { "rep_thres",  "set repeat threshold",      OFFSET(repeat_threshold),      AV_OPT_TYPE_FLOAT, {.dbl = 3.0},  -1, FLT_MAX, FLAGS },
    { "half_life", "half life of cumulative statistics", OFFSET(half_life),     AV_OPT_TYPE_FLOAT, {.dbl = 0.0},  -1, INT_MAX, FLAGS },
    { "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 },
    { NULL }
};

AVFILTER_DEFINE_CLASS(idet);

static const char *type2str(Type type)
{
    switch(type) {
        case TFF          : return "tff";
        case BFF          : return "bff";
        case PROGRESSIVE  : return "progressive";
        case UNDETERMINED : return "undetermined";
    }
    return NULL;
}

#define PRECISION 1048576

static uint64_t uintpow(uint64_t b,unsigned int e)
{
    uint64_t r=1;
    while(e--) r*=b;
    return r;
}

static int av_dict_set_fxp(AVDictionary **pm, const char *key, uint64_t value, unsigned int digits,
                int flags)
{
    char valuestr[44];
    uint64_t print_precision = uintpow(10, digits);

    value = av_rescale(value, print_precision, PRECISION);

    snprintf(valuestr, sizeof(valuestr), "%"PRId64".%0*"PRId64,
             value / print_precision, digits, value % print_precision);

    return av_dict_set(pm, key, valuestr, flags);
}

static const char *rep2str(RepeatedField repeated_field)
{
    switch(repeated_field) {
        case REPEAT_NONE    : return "neither";
        case REPEAT_TOP     : return "top";
        case REPEAT_BOTTOM  : return "bottom";
    }
    return NULL;
}

int ff_idet_filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w)
{
    int x;
    int ret=0;

    for(x=0; x<w; x++){
        int v = (*a++ + *c++) - 2 * *b++;
        ret += FFABS(v);
    }

    return ret;
}

int ff_idet_filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w)
{
    int x;
    int ret=0;

    for(x=0; x<w; x++){
        int v = (*a++ + *c++) - 2 * *b++;
        ret += FFABS(v);
    }

    return ret;
}

static void filter(AVFilterContext *ctx)
{
    IDETContext *idet = ctx->priv;
    int y, i;
    int64_t alpha[2]={0};
    int64_t delta=0;
    int64_t gamma[2]={0};
    Type type, best_type;
    RepeatedField repeat;
    int match = 0;
    AVDictionary **metadata = &idet->cur->metadata;

    for (i = 0; i < idet->csp->nb_components; i++) {
        int w = idet->cur->width;
        int h = idet->cur->height;
        int refs = idet->cur->linesize[i];

        if (i && i<3) {
            w = AV_CEIL_RSHIFT(w, idet->csp->log2_chroma_w);
            h = AV_CEIL_RSHIFT(h, idet->csp->log2_chroma_h);
        }

        for (y = 2; y < h - 2; y++) {
            uint8_t *prev = &idet->prev->data[i][y*refs];
            uint8_t *cur  = &idet->cur ->data[i][y*refs];
            uint8_t *next = &idet->next->data[i][y*refs];
            alpha[ y   &1] += idet->filter_line(cur-refs, prev, cur+refs, w);
            alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w);
            delta          += idet->filter_line(cur-refs,  cur, cur+refs, w);
            gamma[(y^1)&1] += idet->filter_line(cur     , prev, cur     , w);
        }
    }

    if      (alpha[0] > idet->interlace_threshold * alpha[1]){
        type = TFF;
    }else if(alpha[1] > idet->interlace_threshold * alpha[0]){
        type = BFF;
    }else if(alpha[1] > idet->progressive_threshold * delta){
        type = PROGRESSIVE;
    }else{
        type = UNDETERMINED;
    }

    if ( gamma[0] > idet->repeat_threshold * gamma[1] ){
        repeat = REPEAT_TOP;
    } else if ( gamma[1] > idet->repeat_threshold * gamma[0] ){
        repeat = REPEAT_BOTTOM;
    } else {
        repeat = REPEAT_NONE;
    }

    memmove(idet->history+1, idet->history, HIST_SIZE-1);
    idet->history[0] = type;
    best_type = UNDETERMINED;
    for(i=0; i<HIST_SIZE; i++){
        if(idet->history[i] != UNDETERMINED){
            if(best_type == UNDETERMINED)
                best_type = idet->history[i];

            if(idet->history[i] == best_type) {
                match++;
            }else{
                match=0;
                break;
            }
        }
    }
    if(idet->last_type == UNDETERMINED){
        if(match  ) idet->last_type = best_type;
    }else{
        if(match>2) idet->last_type = best_type;
    }

    if      (idet->last_type == TFF){
#if FF_API_INTERLACED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
        idet->cur->top_field_first = 1;
        idet->cur->interlaced_frame = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
        idet->cur->flags |= (AV_FRAME_FLAG_INTERLACED | AV_FRAME_FLAG_TOP_FIELD_FIRST);
    }else if(idet->last_type == BFF){
#if FF_API_INTERLACED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
        idet->cur->top_field_first = 0;
        idet->cur->interlaced_frame = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
        idet->cur->flags &= ~AV_FRAME_FLAG_TOP_FIELD_FIRST;
        idet->cur->flags |= AV_FRAME_FLAG_INTERLACED;
    }else if(idet->last_type == PROGRESSIVE){
#if FF_API_INTERLACED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
        idet->cur->interlaced_frame = 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
        idet->cur->flags &= ~AV_FRAME_FLAG_INTERLACED;
    }

    for(i=0; i<3; i++)
        idet->repeats[i]  = av_rescale(idet->repeats [i], idet->decay_coefficient, PRECISION);

    for(i=0; i<4; i++){
        idet->prestat [i] = av_rescale(idet->prestat [i], idet->decay_coefficient, PRECISION);
        idet->poststat[i] = av_rescale(idet->poststat[i], idet->decay_coefficient, PRECISION);
    }

    idet->total_repeats [         repeat] ++;
    idet->repeats       [         repeat] += PRECISION;

    idet->total_prestat [           type] ++;
    idet->prestat       [           type] += PRECISION;

    idet->total_poststat[idet->last_type] ++;
    idet->poststat      [idet->last_type] += PRECISION;

    av_log(ctx, AV_LOG_DEBUG, "Repeated Field:%12s, Single frame:%12s, Multi frame:%12s\n",
           rep2str(repeat), type2str(type), type2str(idet->last_type));

    av_dict_set    (metadata, "lavfi.idet.repeated.current_frame", rep2str(repeat), 0);
    av_dict_set_fxp(metadata, "lavfi.idet.repeated.neither",       idet->repeats[REPEAT_NONE], 2, 0);
    av_dict_set_fxp(metadata, "lavfi.idet.repeated.top",           idet->repeats[REPEAT_TOP], 2, 0);
    av_dict_set_fxp(metadata, "lavfi.idet.repeated.bottom",        idet->repeats[REPEAT_BOTTOM], 2, 0);

    av_dict_set    (metadata, "lavfi.idet.single.current_frame",   type2str(type), 0);
    av_dict_set_fxp(metadata, "lavfi.idet.single.tff",             idet->prestat[TFF], 2 , 0);
    av_dict_set_fxp(metadata, "lavfi.idet.single.bff",             idet->prestat[BFF], 2, 0);
    av_dict_set_fxp(metadata, "lavfi.idet.single.progressive",     idet->prestat[PROGRESSIVE], 2, 0);
    av_dict_set_fxp(metadata, "lavfi.idet.single.undetermined",    idet->prestat[UNDETERMINED], 2, 0);

    av_dict_set    (metadata, "lavfi.idet.multiple.current_frame", type2str(idet->last_type), 0);
    av_dict_set_fxp(metadata, "lavfi.idet.multiple.tff",           idet->poststat[TFF], 2, 0);
    av_dict_set_fxp(metadata, "lavfi.idet.multiple.bff",           idet->poststat[BFF], 2, 0);
    av_dict_set_fxp(metadata, "lavfi.idet.multiple.progressive",   idet->poststat[PROGRESSIVE], 2, 0);
    av_dict_set_fxp(metadata, "lavfi.idet.multiple.undetermined",  idet->poststat[UNDETERMINED], 2, 0);
}

static int filter_frame(AVFilterLink *link, AVFrame *picref)
{
    AVFilterContext *ctx = link->dst;
    IDETContext *idet = ctx->priv;

    // initial frame(s) and not interlaced, just pass through for
    // the analyze_interlaced_flag mode
    if (idet->analyze_interlaced_flag &&
        !(picref->flags & AV_FRAME_FLAG_INTERLACED) &&
        !idet->next) {
        return ff_filter_frame(ctx->outputs[0], picref);
    }
    if (idet->analyze_interlaced_flag_done) {
        if ((picref->flags & AV_FRAME_FLAG_INTERLACED) && idet->interlaced_flag_accuracy < 0) {
#if FF_API_INTERLACED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
            picref->interlaced_frame = 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
            picref->flags &= ~AV_FRAME_FLAG_INTERLACED;
        }
        return ff_filter_frame(ctx->outputs[0], picref);
    }

    av_frame_free(&idet->prev);

    if(   picref->width  != link->w
       || picref->height != link->h
       || picref->format != link->format) {
        link->dst->inputs[0]->format = picref->format;
        link->dst->inputs[0]->w      = picref->width;
        link->dst->inputs[0]->h      = picref->height;

        av_frame_free(&idet->cur );
        av_frame_free(&idet->next);
    }

    idet->prev = idet->cur;
    idet->cur  = idet->next;
    idet->next = picref;

    if (!idet->cur &&
        !(idet->cur = av_frame_clone(idet->next)))
        return AVERROR(ENOMEM);

    if (!idet->prev)
        return 0;

    if (!idet->csp)
        idet->csp = av_pix_fmt_desc_get(link->format);
    if (idet->csp->comp[0].depth > 8){
        idet->filter_line = (ff_idet_filter_func)ff_idet_filter_line_c_16bit;
#if ARCH_X86
        ff_idet_init_x86(idet, 1);
#endif
    }

    if (idet->analyze_interlaced_flag) {
        if (idet->cur->flags & AV_FRAME_FLAG_INTERLACED) {
#if FF_API_INTERLACED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
            idet->cur->interlaced_frame = 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
            idet->cur->flags &= ~AV_FRAME_FLAG_INTERLACED;
            filter(ctx);
            if (idet->last_type == PROGRESSIVE) {
                idet->interlaced_flag_accuracy --;
                idet->analyze_interlaced_flag --;
            } else if (idet->last_type != UNDETERMINED) {
                idet->interlaced_flag_accuracy ++;
                idet->analyze_interlaced_flag --;
            }
            if (idet->analyze_interlaced_flag == 1) {
                ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));

                if ((idet->next->flags & AV_FRAME_FLAG_INTERLACED) && idet->interlaced_flag_accuracy < 0) {
#if FF_API_INTERLACED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
                    idet->next->interlaced_frame = 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
                    idet->next->flags &= ~AV_FRAME_FLAG_INTERLACED;
                }
                idet->analyze_interlaced_flag_done = 1;
                av_log(ctx, AV_LOG_INFO, "Final flag accuracy %d\n", idet->interlaced_flag_accuracy);
                return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->next));
            }
        }
    } else {
        filter(ctx);
    }

    return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));
}

static int request_frame(AVFilterLink *link)
{
    AVFilterContext *ctx = link->src;
    IDETContext *idet = ctx->priv;
    int ret;

    if (idet->eof)
        return AVERROR_EOF;

    ret = ff_request_frame(link->src->inputs[0]);

    if (ret == AVERROR_EOF && idet->cur && !idet->analyze_interlaced_flag_done) {
        AVFrame *next = av_frame_clone(idet->next);

        if (!next)
            return AVERROR(ENOMEM);

        ret = filter_frame(link->src->inputs[0], next);
        idet->eof = 1;
    }

    return ret;
}

static av_cold void uninit(AVFilterContext *ctx)
{
    IDETContext *idet = ctx->priv;

    av_log(ctx, AV_LOG_INFO, "Repeated Fields: Neither:%6"PRId64" Top:%6"PRId64" Bottom:%6"PRId64"\n",
           idet->total_repeats[REPEAT_NONE],
           idet->total_repeats[REPEAT_TOP],
           idet->total_repeats[REPEAT_BOTTOM]
        );
    av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
           idet->total_prestat[TFF],
           idet->total_prestat[BFF],
           idet->total_prestat[PROGRESSIVE],
           idet->total_prestat[UNDETERMINED]
        );
    av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
           idet->total_poststat[TFF],
           idet->total_poststat[BFF],
           idet->total_poststat[PROGRESSIVE],
           idet->total_poststat[UNDETERMINED]
        );

    av_frame_free(&idet->prev);
    av_frame_free(&idet->cur );
    av_frame_free(&idet->next);
}

static const enum AVPixelFormat pix_fmts[] = {
    AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_YUV422P,
    AV_PIX_FMT_YUV444P,
    AV_PIX_FMT_YUV410P,
    AV_PIX_FMT_YUV411P,
    AV_PIX_FMT_GRAY8,
    AV_PIX_FMT_YUVJ420P,
    AV_PIX_FMT_YUVJ422P,
    AV_PIX_FMT_YUVJ444P,
    AV_PIX_FMT_GRAY16,
    AV_PIX_FMT_YUV440P,
    AV_PIX_FMT_YUVJ440P,
    AV_PIX_FMT_YUV420P9,
    AV_PIX_FMT_YUV422P9,
    AV_PIX_FMT_YUV444P9,
    AV_PIX_FMT_YUV420P10,
    AV_PIX_FMT_YUV422P10,
    AV_PIX_FMT_YUV444P10,
    AV_PIX_FMT_YUV420P12,
    AV_PIX_FMT_YUV422P12,
    AV_PIX_FMT_YUV444P12,
    AV_PIX_FMT_YUV420P14,
    AV_PIX_FMT_YUV422P14,
    AV_PIX_FMT_YUV444P14,
    AV_PIX_FMT_YUV420P16,
    AV_PIX_FMT_YUV422P16,
    AV_PIX_FMT_YUV444P16,
    AV_PIX_FMT_YUVA420P,
    AV_PIX_FMT_YUVA422P,
    AV_PIX_FMT_YUVA444P,
    AV_PIX_FMT_NONE
};

static av_cold int init(AVFilterContext *ctx)
{
    IDETContext *idet = ctx->priv;

    idet->eof = 0;
    idet->last_type = UNDETERMINED;
    memset(idet->history, UNDETERMINED, HIST_SIZE);

    if( idet->half_life > 0 )
        idet->decay_coefficient = lrint( PRECISION * exp2(-1.0 / idet->half_life) );
    else
        idet->decay_coefficient = PRECISION;

    idet->filter_line = ff_idet_filter_line_c;

#if ARCH_X86
    ff_idet_init_x86(idet, 0);
#endif

    return 0;
}

static const AVFilterPad idet_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
    },
};

static const AVFilterPad idet_outputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .request_frame = request_frame
    },
};

const AVFilter ff_vf_idet = {
    .name          = "idet",
    .description   = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
    .priv_size     = sizeof(IDETContext),
    .init          = init,
    .uninit        = uninit,
    .flags         = AVFILTER_FLAG_METADATA_ONLY,
    FILTER_INPUTS(idet_inputs),
    FILTER_OUTPUTS(idet_outputs),
    FILTER_PIXFMTS_ARRAY(pix_fmts),
    .priv_class    = &idet_class,
};