libavfilter/vf_w3fdif.c

   1 /*
   2  * Copyright (C) 2012 British Broadcasting Corporation, All Rights Reserved
   3  * Author of de-interlace algorithm: Jim Easterbrook for BBC R&D
   4  * Based on the process described by Martin Weston for BBC R&D
   5  * Author of FFmpeg filter: Mark Himsley for BBC Broadcast Systems Development
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * FFmpeg is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include "libavutil/common.h"
  25 #include "libavutil/imgutils.h"
  26 #include "libavutil/mem.h"
  27 #include "libavutil/opt.h"
  28 #include "libavutil/pixdesc.h"
  29 #include "avfilter.h"
  30 #include "filters.h"
  31 #include "video.h"
  32 #include "w3fdif.h"
  33
  34 typedef struct W3FDIFContext {
  35     const AVClass *class;
  36     int filter;           ///< 0 is simple, 1 is more complex
  37     int mode;             ///< 0 is frame, 1 is field
  38     int parity;           ///< frame field parity
  39     int deint;            ///< which frames to deinterlace
  40     int linesize[4];      ///< bytes of pixel data per line for each plane
  41     int planeheight[4];   ///< height of each plane
  42     int field;            ///< which field are we on, 0 or 1
  43     int eof;
  44     int nb_planes;
  45     AVFrame *prev, *cur, *next;  ///< previous, current, next frames
  46     int32_t **work_line;  ///< lines we are calculating
  47     int nb_threads;
  48     int max;
  49
  50     W3FDIFDSPContext dsp;
  51 } W3FDIFContext;
  52
  53 #define OFFSET(x) offsetof(W3FDIFContext, x)
  54 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
  55 #define CONST(name, help, val, u) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, .unit = u }
  56
  57 static const AVOption w3fdif_options[] = {
  58     { "filter", "specify the filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, .unit = "filter" },
  59     CONST("simple",  NULL, 0, "filter"),
  60     CONST("complex", NULL, 1, "filter"),
  61     { "mode",   "specify the interlacing mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, .unit = "mode"},
  62     CONST("frame", "send one frame for each frame", 0, "mode"),
  63     CONST("field", "send one frame for each field", 1, "mode"),
  64     { "parity", "specify the assumed picture field parity", OFFSET(parity), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, FLAGS, .unit = "parity" },
  65     CONST("tff",  "assume top field first",     0, "parity"),
  66     CONST("bff",  "assume bottom field first",  1, "parity"),
  67     CONST("auto", "auto detect parity",        -1, "parity"),
  68     { "deint",  "specify which frames to deinterlace", OFFSET(deint), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, .unit = "deint" },
  69     CONST("all",        "deinterlace all frames",                       0, "deint"),
  70     CONST("interlaced", "only deinterlace frames marked as interlaced", 1, "deint"),
  71     { NULL }
  72 };
  73
  74 AVFILTER_DEFINE_CLASS(w3fdif);
  75
  76 static const enum AVPixelFormat pix_fmts[] = {
  77     AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
  78     AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
  79     AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
  80     AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
  81     AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
  82     AV_PIX_FMT_YUVJ411P,
  83     AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
  84     AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
  85     AV_PIX_FMT_GRAY8,
  86     AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
  87     AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
  88     AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
  89     AV_PIX_FMT_YUV440P10,
  90     AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
  91     AV_PIX_FMT_YUV440P12,
  92     AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
  93     AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
  94     AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
  95     AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
  96     AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
  97     AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
  98     AV_PIX_FMT_GBRAP10,   AV_PIX_FMT_GBRAP12,    AV_PIX_FMT_GBRAP16,
  99     AV_PIX_FMT_NONE
 100 };
 101
 102 static void filter_simple_low(int32_t *work_line,
 103                               uint8_t *in_lines_cur[2],
 104                               const int16_t *coef, int linesize)
 105 {
 106     int i;
 107
 108     for (i = 0; i < linesize; i++) {
 109         *work_line    = *in_lines_cur[0]++ * coef[0];
 110         *work_line++ += *in_lines_cur[1]++ * coef[1];
 111     }
 112 }
 113
 114 static void filter_complex_low(int32_t *work_line,
 115                                uint8_t *in_lines_cur[4],
 116                                const int16_t *coef, int linesize)
 117 {
 118     int i;
 119
 120     for (i = 0; i < linesize; i++) {
 121         *work_line    = *in_lines_cur[0]++ * coef[0];
 122         *work_line   += *in_lines_cur[1]++ * coef[1];
 123         *work_line   += *in_lines_cur[2]++ * coef[2];
 124         *work_line++ += *in_lines_cur[3]++ * coef[3];
 125     }
 126 }
 127
 128 static void filter_simple_high(int32_t *work_line,
 129                                uint8_t *in_lines_cur[3],
 130                                uint8_t *in_lines_adj[3],
 131                                const int16_t *coef, int linesize)
 132 {
 133     int i;
 134
 135     for (i = 0; i < linesize; i++) {
 136         *work_line   += *in_lines_cur[0]++ * coef[0];
 137         *work_line   += *in_lines_adj[0]++ * coef[0];
 138         *work_line   += *in_lines_cur[1]++ * coef[1];
 139         *work_line   += *in_lines_adj[1]++ * coef[1];
 140         *work_line   += *in_lines_cur[2]++ * coef[2];
 141         *work_line++ += *in_lines_adj[2]++ * coef[2];
 142     }
 143 }
 144
 145 static void filter_complex_high(int32_t *work_line,
 146                                 uint8_t *in_lines_cur[5],
 147                                 uint8_t *in_lines_adj[5],
 148                                 const int16_t *coef, int linesize)
 149 {
 150     int i;
 151
 152     for (i = 0; i < linesize; i++) {
 153         *work_line   += *in_lines_cur[0]++ * coef[0];
 154         *work_line   += *in_lines_adj[0]++ * coef[0];
 155         *work_line   += *in_lines_cur[1]++ * coef[1];
 156         *work_line   += *in_lines_adj[1]++ * coef[1];
 157         *work_line   += *in_lines_cur[2]++ * coef[2];
 158         *work_line   += *in_lines_adj[2]++ * coef[2];
 159         *work_line   += *in_lines_cur[3]++ * coef[3];
 160         *work_line   += *in_lines_adj[3]++ * coef[3];
 161         *work_line   += *in_lines_cur[4]++ * coef[4];
 162         *work_line++ += *in_lines_adj[4]++ * coef[4];
 163     }
 164 }
 165
 166 static void filter_scale(uint8_t *out_pixel, const int32_t *work_pixel, int linesize, int max)
 167 {
 168     int j;
 169
 170     for (j = 0; j < linesize; j++, out_pixel++, work_pixel++)
 171         *out_pixel = av_clip(*work_pixel, 0, 255 * 256 * 128) >> 15;
 172 }
 173
 174 static void filter16_simple_low(int32_t *work_line,
 175                                 uint8_t *in_lines_cur8[2],
 176                                 const int16_t *coef, int linesize)
 177 {
 178     uint16_t *in_lines_cur[2] = { (uint16_t *)in_lines_cur8[0], (uint16_t *)in_lines_cur8[1] };
 179     int i;
 180
 181     linesize /= 2;
 182     for (i = 0; i < linesize; i++) {
 183         *work_line    = *in_lines_cur[0]++ * coef[0];
 184         *work_line++ += *in_lines_cur[1]++ * coef[1];
 185     }
 186 }
 187
 188 static void filter16_complex_low(int32_t *work_line,
 189                                  uint8_t *in_lines_cur8[4],
 190                                  const int16_t *coef, int linesize)
 191 {
 192     uint16_t *in_lines_cur[4] = { (uint16_t *)in_lines_cur8[0],
 193                                   (uint16_t *)in_lines_cur8[1],
 194                                   (uint16_t *)in_lines_cur8[2],
 195                                   (uint16_t *)in_lines_cur8[3] };
 196     int i;
 197
 198     linesize /= 2;
 199     for (i = 0; i < linesize; i++) {
 200         *work_line    = *in_lines_cur[0]++ * coef[0];
 201         *work_line   += *in_lines_cur[1]++ * coef[1];
 202         *work_line   += *in_lines_cur[2]++ * coef[2];
 203         *work_line++ += *in_lines_cur[3]++ * coef[3];
 204     }
 205 }
 206
 207 static void filter16_simple_high(int32_t *work_line,
 208                                  uint8_t *in_lines_cur8[3],
 209                                  uint8_t *in_lines_adj8[3],
 210                                  const int16_t *coef, int linesize)
 211 {
 212     uint16_t *in_lines_cur[3] = { (uint16_t *)in_lines_cur8[0],
 213                                   (uint16_t *)in_lines_cur8[1],
 214                                   (uint16_t *)in_lines_cur8[2] };
 215     uint16_t *in_lines_adj[3] = { (uint16_t *)in_lines_adj8[0],
 216                                   (uint16_t *)in_lines_adj8[1],
 217                                   (uint16_t *)in_lines_adj8[2] };
 218     int i;
 219
 220     linesize /= 2;
 221     for (i = 0; i < linesize; i++) {
 222         *work_line   += *in_lines_cur[0]++ * coef[0];
 223         *work_line   += *in_lines_adj[0]++ * coef[0];
 224         *work_line   += *in_lines_cur[1]++ * coef[1];
 225         *work_line   += *in_lines_adj[1]++ * coef[1];
 226         *work_line   += *in_lines_cur[2]++ * coef[2];
 227         *work_line++ += *in_lines_adj[2]++ * coef[2];
 228     }
 229 }
 230
 231 static void filter16_complex_high(int32_t *work_line,
 232                                   uint8_t *in_lines_cur8[5],
 233                                   uint8_t *in_lines_adj8[5],
 234                                   const int16_t *coef, int linesize)
 235 {
 236     uint16_t *in_lines_cur[5] = { (uint16_t *)in_lines_cur8[0],
 237                                   (uint16_t *)in_lines_cur8[1],
 238                                   (uint16_t *)in_lines_cur8[2],
 239                                   (uint16_t *)in_lines_cur8[3],
 240                                   (uint16_t *)in_lines_cur8[4] };
 241     uint16_t *in_lines_adj[5] = { (uint16_t *)in_lines_adj8[0],
 242                                   (uint16_t *)in_lines_adj8[1],
 243                                   (uint16_t *)in_lines_adj8[2],
 244                                   (uint16_t *)in_lines_adj8[3],
 245                                   (uint16_t *)in_lines_adj8[4] };
 246     int i;
 247
 248     linesize /= 2;
 249     for (i = 0; i < linesize; i++) {
 250         *work_line   += *in_lines_cur[0]++ * coef[0];
 251         *work_line   += *in_lines_adj[0]++ * coef[0];
 252         *work_line   += *in_lines_cur[1]++ * coef[1];
 253         *work_line   += *in_lines_adj[1]++ * coef[1];
 254         *work_line   += *in_lines_cur[2]++ * coef[2];
 255         *work_line   += *in_lines_adj[2]++ * coef[2];
 256         *work_line   += *in_lines_cur[3]++ * coef[3];
 257         *work_line   += *in_lines_adj[3]++ * coef[3];
 258         *work_line   += *in_lines_cur[4]++ * coef[4];
 259         *work_line++ += *in_lines_adj[4]++ * coef[4];
 260     }
 261 }
 262
 263 static void filter16_scale(uint8_t *out_pixel8, const int32_t *work_pixel, int linesize, int max)
 264 {
 265     uint16_t *out_pixel = (uint16_t *)out_pixel8;
 266     int j;
 267
 268     linesize /= 2;
 269     for (j = 0; j < linesize; j++, out_pixel++, work_pixel++)
 270         *out_pixel = av_clip(*work_pixel, 0, max) >> 15;
 271 }
 272
 273 static int config_input(AVFilterLink *inlink)
 274 {
 275     AVFilterContext *ctx = inlink->dst;
 276     W3FDIFContext *s = ctx->priv;
 277     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
 278     int ret, i, depth, nb_threads;
 279
 280     if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
 281         return ret;
 282
 283     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
 284     s->planeheight[0] = s->planeheight[3] = inlink->h;
 285
 286     if (inlink->h < 3) {
 287         av_log(ctx, AV_LOG_ERROR, "Video of less than 3 lines is not supported\n");
 288         return AVERROR(EINVAL);
 289     }
 290
 291     s->nb_planes = av_pix_fmt_count_planes(inlink->format);
 292     nb_threads = ff_filter_get_nb_threads(ctx);
 293     s->work_line = av_calloc(nb_threads, sizeof(*s->work_line));
 294     if (!s->work_line)
 295         return AVERROR(ENOMEM);
 296     s->nb_threads = nb_threads;
 297
 298     for (i = 0; i < s->nb_threads; i++) {
 299         s->work_line[i] = av_calloc(FFALIGN(s->linesize[0], 32), sizeof(*s->work_line[0]));
 300         if (!s->work_line[i])
 301             return AVERROR(ENOMEM);
 302     }
 303
 304     depth = desc->comp[0].depth;
 305     s->max = ((1 << depth) - 1) * 256 * 128;
 306     if (depth <= 8) {
 307         s->dsp.filter_simple_low   = filter_simple_low;
 308         s->dsp.filter_complex_low  = filter_complex_low;
 309         s->dsp.filter_simple_high  = filter_simple_high;
 310         s->dsp.filter_complex_high = filter_complex_high;
 311         s->dsp.filter_scale        = filter_scale;
 312     } else {
 313         s->dsp.filter_simple_low   = filter16_simple_low;
 314         s->dsp.filter_complex_low  = filter16_complex_low;
 315         s->dsp.filter_simple_high  = filter16_simple_high;
 316         s->dsp.filter_complex_high = filter16_complex_high;
 317         s->dsp.filter_scale        = filter16_scale;
 318     }
 319
 320 #if ARCH_X86
 321     ff_w3fdif_init_x86(&s->dsp, depth);
 322 #endif
 323
 324     return 0;
 325 }
 326
 327 static int config_output(AVFilterLink *outlink)
 328 {
 329     AVFilterContext *ctx = outlink->src;
 330     AVFilterLink *inlink = ctx->inputs[0];
 331     FilterLink *il = ff_filter_link(inlink);
 332     FilterLink *ol = ff_filter_link(outlink);
 333     W3FDIFContext *s = ctx->priv;
 334
 335     outlink->time_base = av_mul_q(inlink->time_base, (AVRational){1, 2});
 336     if (s->mode)
 337         ol->frame_rate = av_mul_q(il->frame_rate, (AVRational){2, 1});
 338
 339     return 0;
 340 }
 341
 342 /*
 343  * Filter coefficients from PH-2071, scaled by 256 * 128.
 344  * Each set of coefficients has a set for low-frequencies and high-frequencies.
 345  * n_coef_lf[] and n_coef_hf[] are the number of coefs for simple and more-complex.
 346  * It is important for later that n_coef_lf[] is even and n_coef_hf[] is odd.
 347  * coef_lf[][] and coef_hf[][] are the coefficients for low-frequencies
 348  * and high-frequencies for simple and more-complex mode.
 349  */
 350 static const int8_t   n_coef_lf[2] = { 2, 4 };
 351 static const int16_t coef_lf[2][4] = {{ 16384, 16384,     0,    0},
 352                                       {  -852, 17236, 17236, -852}};
 353 static const int8_t   n_coef_hf[2] = { 3, 5 };
 354 static const int16_t coef_hf[2][5] = {{ -2048,  4096, -2048,     0,    0},
 355                                       {  1016, -3801,  5570, -3801, 1016}};
 356
 357 typedef struct ThreadData {
 358     AVFrame *out, *cur, *adj;
 359 } ThreadData;
 360
 361 static int deinterlace_plane_slice(AVFilterContext *ctx, void *arg,
 362                                    int jobnr, int nb_jobs, int plane)
 363 {
 364     W3FDIFContext *s = ctx->priv;
 365     ThreadData *td = arg;
 366     AVFrame *out = td->out;
 367     AVFrame *cur = td->cur;
 368     AVFrame *adj = td->adj;
 369     const int filter = s->filter;
 370     uint8_t *in_line, *in_lines_cur[5], *in_lines_adj[5];
 371     uint8_t *out_line, *out_pixel;
 372     int32_t *work_line, *work_pixel;
 373     uint8_t *cur_data = cur->data[plane];
 374     uint8_t *adj_data = adj->data[plane];
 375     uint8_t *dst_data = out->data[plane];
 376     const int linesize = s->linesize[plane];
 377     const int height   = s->planeheight[plane];
 378     const int cur_line_stride = cur->linesize[plane];
 379     const int adj_line_stride = adj->linesize[plane];
 380     const int dst_line_stride = out->linesize[plane];
 381     const int start = (height * jobnr) / nb_jobs;
 382     const int end = (height * (jobnr+1)) / nb_jobs;
 383     const int max = s->max;
 384     const int interlaced = !!(cur->flags & AV_FRAME_FLAG_INTERLACED);
 385     const int tff = s->field == (s->parity == -1 ? interlaced ? !!(cur->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) : 1 :
 386                                  s->parity ^ 1);
 387     int j, y_in, y_out;
 388
 389     /* copy unchanged the lines of the field */
 390     y_out = start + (tff ^ (start & 1));
 391
 392     in_line  = cur_data + (y_out * cur_line_stride);
 393     out_line = dst_data + (y_out * dst_line_stride);
 394
 395     while (y_out < end) {
 396         memcpy(out_line, in_line, linesize);
 397         y_out += 2;
 398         in_line  += cur_line_stride * 2;
 399         out_line += dst_line_stride * 2;
 400     }
 401
 402     /* interpolate other lines of the field */
 403     y_out = start + ((!tff) ^ (start & 1));
 404
 405     out_line = dst_data + (y_out * dst_line_stride);
 406
 407     while (y_out < end) {
 408         /* get low vertical frequencies from current field */
 409         for (j = 0; j < n_coef_lf[filter]; j++) {
 410             y_in = (y_out + 1) + (j * 2) - n_coef_lf[filter];
 411
 412             while (y_in < 0)
 413                 y_in += 2;
 414             while (y_in >= height)
 415                 y_in -= 2;
 416
 417             in_lines_cur[j] = cur_data + (y_in * cur_line_stride);
 418         }
 419
 420         work_line = s->work_line[jobnr];
 421         switch (n_coef_lf[filter]) {
 422         case 2:
 423             s->dsp.filter_simple_low(work_line, in_lines_cur,
 424                                      coef_lf[filter], linesize);
 425             break;
 426         case 4:
 427             s->dsp.filter_complex_low(work_line, in_lines_cur,
 428                                       coef_lf[filter], linesize);
 429         }
 430
 431         /* get high vertical frequencies from adjacent fields */
 432         for (j = 0; j < n_coef_hf[filter]; j++) {
 433             y_in = (y_out + 1) + (j * 2) - n_coef_hf[filter];
 434
 435             while (y_in < 0)
 436                 y_in += 2;
 437             while (y_in >= height)
 438                 y_in -= 2;
 439
 440             in_lines_cur[j] = cur_data + (y_in * cur_line_stride);
 441             in_lines_adj[j] = adj_data + (y_in * adj_line_stride);
 442         }
 443
 444         work_line = s->work_line[jobnr];
 445         switch (n_coef_hf[filter]) {
 446         case 3:
 447             s->dsp.filter_simple_high(work_line, in_lines_cur, in_lines_adj,
 448                                       coef_hf[filter], linesize);
 449             break;
 450         case 5:
 451             s->dsp.filter_complex_high(work_line, in_lines_cur, in_lines_adj,
 452                                        coef_hf[filter], linesize);
 453         }
 454
 455         /* save scaled result to the output frame, scaling down by 256 * 128 */
 456         work_pixel = s->work_line[jobnr];
 457         out_pixel = out_line;
 458
 459         s->dsp.filter_scale(out_pixel, work_pixel, linesize, max);
 460
 461         /* move on to next line */
 462         y_out += 2;
 463         out_line += dst_line_stride * 2;
 464     }
 465
 466     return 0;
 467 }
 468
 469 static int deinterlace_slice(AVFilterContext *ctx, void *arg,
 470                              int jobnr, int nb_jobs)
 471 {
 472     W3FDIFContext *s = ctx->priv;
 473
 474     for (int p = 0; p < s->nb_planes; p++)
 475         deinterlace_plane_slice(ctx, arg, jobnr, nb_jobs, p);
 476
 477     return 0;
 478 }
 479
 480 static int filter(AVFilterContext *ctx, int is_second)
 481 {
 482     W3FDIFContext *s = ctx->priv;
 483     AVFilterLink *outlink = ctx->outputs[0];
 484     AVFrame *out, *adj;
 485     ThreadData td;
 486
 487     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
 488     if (!out)
 489         return AVERROR(ENOMEM);
 490     av_frame_copy_props(out, s->cur);
 491 #if FF_API_INTERLACED_FRAME
 492 FF_DISABLE_DEPRECATION_WARNINGS
 493     out->interlaced_frame = 0;
 494 FF_ENABLE_DEPRECATION_WARNINGS
 495 #endif
 496     out->flags &= ~AV_FRAME_FLAG_INTERLACED;
 497
 498     if (!is_second) {
 499         if (out->pts != AV_NOPTS_VALUE)
 500             out->pts *= 2;
 501     } else {
 502         int64_t cur_pts  = s->cur->pts;
 503         int64_t next_pts = s->next->pts;
 504
 505         if (next_pts != AV_NOPTS_VALUE && cur_pts != AV_NOPTS_VALUE) {
 506             out->pts = cur_pts + next_pts;
 507         } else {
 508             out->pts = AV_NOPTS_VALUE;
 509         }
 510     }
 511
 512     adj = s->field ? s->next : s->prev;
 513     td.out = out; td.cur = s->cur; td.adj = adj;
 514     ff_filter_execute(ctx, deinterlace_slice, &td, NULL,
 515                       FFMIN(s->planeheight[1], s->nb_threads));
 516
 517     if (s->mode)
 518         s->field = !s->field;
 519
 520     return ff_filter_frame(outlink, out);
 521 }
 522
 523 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 524 {
 525     AVFilterContext *ctx = inlink->dst;
 526     W3FDIFContext *s = ctx->priv;
 527     int ret;
 528
 529     av_frame_free(&s->prev);
 530     s->prev = s->cur;
 531     s->cur  = s->next;
 532     s->next = frame;
 533
 534     if (!s->cur) {
 535         s->cur = av_frame_clone(s->next);
 536         if (!s->cur)
 537             return AVERROR(ENOMEM);
 538     }
 539
 540     if (!s->prev)
 541         return 0;
 542
 543     if ((s->deint && !(s->cur->flags & AV_FRAME_FLAG_INTERLACED)) || ctx->is_disabled) {
 544         AVFrame *out = av_frame_clone(s->cur);
 545         if (!out)
 546             return AVERROR(ENOMEM);
 547
 548         av_frame_free(&s->prev);
 549         if (out->pts != AV_NOPTS_VALUE)
 550             out->pts *= 2;
 551         return ff_filter_frame(ctx->outputs[0], out);
 552     }
 553
 554     ret = filter(ctx, 0);
 555     if (ret < 0 || s->mode == 0)
 556         return ret;
 557
 558     return filter(ctx, 1);
 559 }
 560
 561 static int request_frame(AVFilterLink *outlink)
 562 {
 563     AVFilterContext *ctx = outlink->src;
 564     W3FDIFContext *s = ctx->priv;
 565     int ret;
 566
 567     if (s->eof)
 568         return AVERROR_EOF;
 569
 570     ret = ff_request_frame(ctx->inputs[0]);
 571
 572     if (ret == AVERROR_EOF && s->cur) {
 573         AVFrame *next = av_frame_clone(s->next);
 574         if (!next)
 575             return AVERROR(ENOMEM);
 576         next->pts = s->next->pts * 2 - s->cur->pts;
 577         filter_frame(ctx->inputs[0], next);
 578         s->eof = 1;
 579     } else if (ret < 0) {
 580         return ret;
 581     }
 582
 583     return 0;
 584 }
 585
 586 static av_cold void uninit(AVFilterContext *ctx)
 587 {
 588     W3FDIFContext *s = ctx->priv;
 589     int i;
 590
 591     av_frame_free(&s->prev);
 592     av_frame_free(&s->cur );
 593     av_frame_free(&s->next);
 594
 595     for (i = 0; i < s->nb_threads; i++)
 596         av_freep(&s->work_line[i]);
 597
 598     av_freep(&s->work_line);
 599 }
 600
 601 static const AVFilterPad w3fdif_inputs[] = {
 602     {
 603         .name          = "default",
 604         .type          = AVMEDIA_TYPE_VIDEO,
 605         .filter_frame  = filter_frame,
 606         .config_props  = config_input,
 607     },
 608 };
 609
 610 static const AVFilterPad w3fdif_outputs[] = {
 611     {
 612         .name          = "default",
 613         .type          = AVMEDIA_TYPE_VIDEO,
 614         .config_props  = config_output,
 615         .request_frame = request_frame,
 616     },
 617 };
 618
 619 const FFFilter ff_vf_w3fdif = {
 620     .p.name        = "w3fdif",
 621     .p.description = NULL_IF_CONFIG_SMALL("Apply Martin Weston three field deinterlace."),
 622     .p.priv_class  = &w3fdif_class,
 623     .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
 624     .priv_size     = sizeof(W3FDIFContext),
 625     .uninit        = uninit,
 626     FILTER_INPUTS(w3fdif_inputs),
 627     FILTER_OUTPUTS(w3fdif_outputs),
 628     FILTER_PIXFMTS_ARRAY(pix_fmts),
 629     .process_command = ff_filter_process_command,
 630 };