git.sesse.net Git - ffmpeg/blob - libavfilter/vf_idet.c

   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
  40 AVFILTER_DEFINE_CLASS(idet);
  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         !(idet->cur = av_frame_clone(idet->next)))
 246         return AVERROR(ENOMEM);
 247
 248     if (!idet->prev)
 249         return 0;
 250
 251     if (!idet->csp)
 252         idet->csp = av_pix_fmt_desc_get(link->format);
 253     if (idet->csp->comp[0].depth_minus1 / 8 == 1){
 254         idet->filter_line = (ff_idet_filter_func)ff_idet_filter_line_c_16bit;
 255         if (ARCH_X86)
 256             ff_idet_init_x86(idet, 1);
 257     }
 258
 259     filter(ctx);
 260
 261     return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));
 262 }
 263
 264 static int request_frame(AVFilterLink *link)
 265 {
 266     AVFilterContext *ctx = link->src;
 267     IDETContext *idet = ctx->priv;
 268
 269     do {
 270         int ret;
 271
 272         if (idet->eof)
 273             return AVERROR_EOF;
 274
 275         ret = ff_request_frame(link->src->inputs[0]);
 276
 277         if (ret == AVERROR_EOF && idet->cur) {
 278             AVFrame *next = av_frame_clone(idet->next);
 279
 280             if (!next)
 281                 return AVERROR(ENOMEM);
 282
 283             filter_frame(link->src->inputs[0], next);
 284             idet->eof = 1;
 285         } else if (ret < 0) {
 286             return ret;
 287         }
 288     } while (link->frame_requested);
 289
 290     return 0;
 291 }
 292
 293 static av_cold void uninit(AVFilterContext *ctx)
 294 {
 295     IDETContext *idet = ctx->priv;
 296
 297     av_log(ctx, AV_LOG_INFO, "Repeated Fields: Neither:%6"PRId64" Top:%6"PRId64" Bottom:%6"PRId64"\n",
 298            idet->total_repeats[REPEAT_NONE],
 299            idet->total_repeats[REPEAT_TOP],
 300            idet->total_repeats[REPEAT_BOTTOM]
 301         );
 302     av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
 303            idet->total_prestat[TFF],
 304            idet->total_prestat[BFF],
 305            idet->total_prestat[PROGRESSIVE],
 306            idet->total_prestat[UNDETERMINED]
 307         );
 308     av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
 309            idet->total_poststat[TFF],
 310            idet->total_poststat[BFF],
 311            idet->total_poststat[PROGRESSIVE],
 312            idet->total_poststat[UNDETERMINED]
 313         );
 314
 315     av_frame_free(&idet->prev);
 316     av_frame_free(&idet->cur );
 317     av_frame_free(&idet->next);
 318 }
 319
 320 static int query_formats(AVFilterContext *ctx)
 321 {
 322     static const enum AVPixelFormat pix_fmts[] = {
 323         AV_PIX_FMT_YUV420P,
 324         AV_PIX_FMT_YUV422P,
 325         AV_PIX_FMT_YUV444P,
 326         AV_PIX_FMT_YUV410P,
 327         AV_PIX_FMT_YUV411P,
 328         AV_PIX_FMT_GRAY8,
 329         AV_PIX_FMT_YUVJ420P,
 330         AV_PIX_FMT_YUVJ422P,
 331         AV_PIX_FMT_YUVJ444P,
 332         AV_PIX_FMT_GRAY16,
 333         AV_PIX_FMT_YUV440P,
 334         AV_PIX_FMT_YUVJ440P,
 335         AV_PIX_FMT_YUV420P9,
 336         AV_PIX_FMT_YUV422P9,
 337         AV_PIX_FMT_YUV444P9,
 338         AV_PIX_FMT_YUV420P10,
 339         AV_PIX_FMT_YUV422P10,
 340         AV_PIX_FMT_YUV444P10,
 341         AV_PIX_FMT_YUV420P12,
 342         AV_PIX_FMT_YUV422P12,
 343         AV_PIX_FMT_YUV444P12,
 344         AV_PIX_FMT_YUV420P14,
 345         AV_PIX_FMT_YUV422P14,
 346         AV_PIX_FMT_YUV444P14,
 347         AV_PIX_FMT_YUV420P16,
 348         AV_PIX_FMT_YUV422P16,
 349         AV_PIX_FMT_YUV444P16,
 350         AV_PIX_FMT_YUVA420P,
 351         AV_PIX_FMT_NONE
 352     };
 353
 354     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
 355
 356     return 0;
 357 }
 358
 359 static int config_output(AVFilterLink *outlink)
 360 {
 361     outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
 362     return 0;
 363 }
 364
 365 static av_cold int init(AVFilterContext *ctx)
 366 {
 367     IDETContext *idet = ctx->priv;
 368
 369     idet->eof = 0;
 370     idet->last_type = UNDETERMINED;
 371     memset(idet->history, UNDETERMINED, HIST_SIZE);
 372
 373     if( idet->half_life > 0 )
 374         idet->decay_coefficient = (uint64_t) round( PRECISION * exp2(-1.0 / idet->half_life) );
 375     else
 376         idet->decay_coefficient = PRECISION;
 377
 378     idet->filter_line = ff_idet_filter_line_c;
 379
 380     if (ARCH_X86)
 381         ff_idet_init_x86(idet, 0);
 382
 383     return 0;
 384 }
 385
 386 static const AVFilterPad idet_inputs[] = {
 387     {
 388         .name         = "default",
 389         .type         = AVMEDIA_TYPE_VIDEO,
 390         .filter_frame = filter_frame,
 391     },
 392     { NULL }
 393 };
 394
 395 static const AVFilterPad idet_outputs[] = {
 396     {
 397         .name         = "default",
 398         .type         = AVMEDIA_TYPE_VIDEO,
 399         .config_props = config_output,
 400         .request_frame = request_frame
 401     },
 402     { NULL }
 403 };
 404
 405 AVFilter ff_vf_idet = {
 406     .name          = "idet",
 407     .description   = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
 408     .priv_size     = sizeof(IDETContext),
 409     .init          = init,
 410     .uninit        = uninit,
 411     .query_formats = query_formats,
 412     .inputs        = idet_inputs,
 413     .outputs       = idet_outputs,
 414     .priv_class    = &idet_class,
 415 };