LCOV - code coverage report
Current view: top level - libavfilter - vf_fieldmatch.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 395 500 79.0 %
Date: 2017-12-13 10:57:33 Functions: 21 21 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012 Fredrik Mellbin
       3             :  * Copyright (c) 2013 Clément Bœsch
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * Fieldmatching filter, ported from VFM filter (VapourSynth) by Clément.
      25             :  * Fredrik Mellbin is the author of the VIVTC/VFM filter, which is itself a
      26             :  * light clone of the TIVTC/TFM (AviSynth) filter written by Kevin Stone
      27             :  * (tritical), the original author.
      28             :  *
      29             :  * @see http://bengal.missouri.edu/~kes25c/
      30             :  * @see http://www.vapoursynth.com/about/
      31             :  */
      32             : 
      33             : #include <inttypes.h>
      34             : 
      35             : #include "libavutil/avassert.h"
      36             : #include "libavutil/imgutils.h"
      37             : #include "libavutil/opt.h"
      38             : #include "libavutil/timestamp.h"
      39             : #include "avfilter.h"
      40             : #include "internal.h"
      41             : 
      42             : #define INPUT_MAIN     0
      43             : #define INPUT_CLEANSRC 1
      44             : 
      45             : enum fieldmatch_parity {
      46             :     FM_PARITY_AUTO   = -1,
      47             :     FM_PARITY_BOTTOM =  0,
      48             :     FM_PARITY_TOP    =  1,
      49             : };
      50             : 
      51             : enum matching_mode {
      52             :     MODE_PC,
      53             :     MODE_PC_N,
      54             :     MODE_PC_U,
      55             :     MODE_PC_N_UB,
      56             :     MODE_PCN,
      57             :     MODE_PCN_UB,
      58             :     NB_MODE
      59             : };
      60             : 
      61             : enum comb_matching_mode {
      62             :     COMBMATCH_NONE,
      63             :     COMBMATCH_SC,
      64             :     COMBMATCH_FULL,
      65             :     NB_COMBMATCH
      66             : };
      67             : 
      68             : enum comb_dbg {
      69             :     COMBDBG_NONE,
      70             :     COMBDBG_PCN,
      71             :     COMBDBG_PCNUB,
      72             :     NB_COMBDBG
      73             : };
      74             : 
      75             : typedef struct FieldMatchContext {
      76             :     const AVClass *class;
      77             : 
      78             :     AVFrame *prv,  *src,  *nxt;     ///< main sliding window of 3 frames
      79             :     AVFrame *prv2, *src2, *nxt2;    ///< sliding window of the optional second stream
      80             :     int got_frame[2];               ///< frame request flag for each input stream
      81             :     int hsub, vsub;                 ///< chroma subsampling values
      82             :     uint32_t eof;                   ///< bitmask for end of stream
      83             :     int64_t lastscdiff;
      84             :     int64_t lastn;
      85             : 
      86             :     /* options */
      87             :     int order;
      88             :     int ppsrc;
      89             :     int mode;                       ///< matching_mode
      90             :     int field;
      91             :     int mchroma;
      92             :     int y0, y1;
      93             :     int64_t scthresh;
      94             :     double scthresh_flt;
      95             :     int combmatch;                  ///< comb_matching_mode
      96             :     int combdbg;
      97             :     int cthresh;
      98             :     int chroma;
      99             :     int blockx, blocky;
     100             :     int combpel;
     101             : 
     102             :     /* misc buffers */
     103             :     uint8_t *map_data[4];
     104             :     int map_linesize[4];
     105             :     uint8_t *cmask_data[4];
     106             :     int cmask_linesize[4];
     107             :     int *c_array;
     108             :     int tpitchy, tpitchuv;
     109             :     uint8_t *tbuffer;
     110             : } FieldMatchContext;
     111             : 
     112             : #define OFFSET(x) offsetof(FieldMatchContext, x)
     113             : #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
     114             : 
     115             : static const AVOption fieldmatch_options[] = {
     116             :     { "order", "specify the assumed field order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=FM_PARITY_AUTO}, -1, 1, FLAGS, "order" },
     117             :         { "auto", "auto detect parity",        0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_AUTO},    INT_MIN, INT_MAX, FLAGS, "order" },
     118             :         { "bff",  "assume bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_BOTTOM},  INT_MIN, INT_MAX, FLAGS, "order" },
     119             :         { "tff",  "assume top field first",    0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_TOP},     INT_MIN, INT_MAX, FLAGS, "order" },
     120             :     { "mode", "set the matching mode or strategy to use", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_PC_N}, MODE_PC, NB_MODE-1, FLAGS, "mode" },
     121             :         { "pc",      "2-way match (p/c)",                                                                    0, AV_OPT_TYPE_CONST, {.i64=MODE_PC},      INT_MIN, INT_MAX, FLAGS, "mode" },
     122             :         { "pc_n",    "2-way match + 3rd match on combed (p/c + u)",                                          0, AV_OPT_TYPE_CONST, {.i64=MODE_PC_N},    INT_MIN, INT_MAX, FLAGS, "mode" },
     123             :         { "pc_u",    "2-way match + 3rd match (same order) on combed (p/c + u)",                             0, AV_OPT_TYPE_CONST, {.i64=MODE_PC_U},    INT_MIN, INT_MAX, FLAGS, "mode" },
     124             :         { "pc_n_ub", "2-way match + 3rd match on combed + 4th/5th matches if still combed (p/c + u + u/b)",  0, AV_OPT_TYPE_CONST, {.i64=MODE_PC_N_UB}, INT_MIN, INT_MAX, FLAGS, "mode" },
     125             :         { "pcn",     "3-way match (p/c/n)",                                                                  0, AV_OPT_TYPE_CONST, {.i64=MODE_PCN},     INT_MIN, INT_MAX, FLAGS, "mode" },
     126             :         { "pcn_ub",  "3-way match + 4th/5th matches on combed (p/c/n + u/b)",                                0, AV_OPT_TYPE_CONST, {.i64=MODE_PCN_UB},  INT_MIN, INT_MAX, FLAGS, "mode" },
     127             :     { "ppsrc", "mark main input as a pre-processed input and activate clean source input stream", OFFSET(ppsrc), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
     128             :     { "field", "set the field to match from", OFFSET(field), AV_OPT_TYPE_INT, {.i64=FM_PARITY_AUTO}, -1, 1, FLAGS, "field" },
     129             :         { "auto",   "automatic (same value as 'order')",    0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_AUTO},    INT_MIN, INT_MAX, FLAGS, "field" },
     130             :         { "bottom", "bottom field",                         0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_BOTTOM},  INT_MIN, INT_MAX, FLAGS, "field" },
     131             :         { "top",    "top field",                            0, AV_OPT_TYPE_CONST, {.i64=FM_PARITY_TOP},     INT_MIN, INT_MAX, FLAGS, "field" },
     132             :     { "mchroma", "set whether or not chroma is included during the match comparisons", OFFSET(mchroma), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1,  FLAGS },
     133             :     { "y0", "define an exclusion band which excludes the lines between y0 and y1 from the field matching decision", OFFSET(y0), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
     134             :     { "y1", "define an exclusion band which excludes the lines between y0 and y1 from the field matching decision", OFFSET(y1), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
     135             :     { "scthresh", "set scene change detection threshold", OFFSET(scthresh_flt), AV_OPT_TYPE_DOUBLE, {.dbl=12}, 0, 100, FLAGS },
     136             :     { "combmatch", "set combmatching mode", OFFSET(combmatch), AV_OPT_TYPE_INT, {.i64=COMBMATCH_SC}, COMBMATCH_NONE, NB_COMBMATCH-1, FLAGS, "combmatching" },
     137             :         { "none", "disable combmatching",                     0, AV_OPT_TYPE_CONST, {.i64=COMBMATCH_NONE}, INT_MIN, INT_MAX, FLAGS, "combmatching" },
     138             :         { "sc",   "enable combmatching only on scene change", 0, AV_OPT_TYPE_CONST, {.i64=COMBMATCH_SC},   INT_MIN, INT_MAX, FLAGS, "combmatching" },
     139             :         { "full", "enable combmatching all the time",         0, AV_OPT_TYPE_CONST, {.i64=COMBMATCH_FULL}, INT_MIN, INT_MAX, FLAGS, "combmatching" },
     140             :     { "combdbg",   "enable comb debug", OFFSET(combdbg), AV_OPT_TYPE_INT, {.i64=COMBDBG_NONE}, COMBDBG_NONE, NB_COMBDBG-1, FLAGS, "dbglvl" },
     141             :         { "none",  "no forced calculation", 0, AV_OPT_TYPE_CONST, {.i64=COMBDBG_NONE},  INT_MIN, INT_MAX, FLAGS, "dbglvl" },
     142             :         { "pcn",   "calculate p/c/n",       0, AV_OPT_TYPE_CONST, {.i64=COMBDBG_PCN},   INT_MIN, INT_MAX, FLAGS, "dbglvl" },
     143             :         { "pcnub", "calculate p/c/n/u/b",   0, AV_OPT_TYPE_CONST, {.i64=COMBDBG_PCNUB}, INT_MIN, INT_MAX, FLAGS, "dbglvl" },
     144             :     { "cthresh", "set the area combing threshold used for combed frame detection",       OFFSET(cthresh), AV_OPT_TYPE_INT, {.i64= 9}, -1, 0xff, FLAGS },
     145             :     { "chroma",  "set whether or not chroma is considered in the combed frame decision", OFFSET(chroma),  AV_OPT_TYPE_BOOL,{.i64= 0},  0,    1, FLAGS },
     146             :     { "blockx",  "set the x-axis size of the window used during combed frame detection", OFFSET(blockx),  AV_OPT_TYPE_INT, {.i64=16},  4, 1<<9, FLAGS },
     147             :     { "blocky",  "set the y-axis size of the window used during combed frame detection", OFFSET(blocky),  AV_OPT_TYPE_INT, {.i64=16},  4, 1<<9, FLAGS },
     148             :     { "combpel", "set the number of combed pixels inside any of the blocky by blockx size blocks on the frame for the frame to be detected as combed", OFFSET(combpel), AV_OPT_TYPE_INT, {.i64=80}, 0, INT_MAX, FLAGS },
     149             :     { NULL }
     150             : };
     151             : 
     152             : AVFILTER_DEFINE_CLASS(fieldmatch);
     153             : 
     154        1552 : static int get_width(const FieldMatchContext *fm, const AVFrame *f, int plane)
     155             : {
     156        1552 :     return plane ? AV_CEIL_RSHIFT(f->width, fm->hsub) : f->width;
     157             : }
     158             : 
     159        1552 : static int get_height(const FieldMatchContext *fm, const AVFrame *f, int plane)
     160             : {
     161        1552 :     return plane ? AV_CEIL_RSHIFT(f->height, fm->vsub) : f->height;
     162             : }
     163             : 
     164         135 : static int64_t luma_abs_diff(const AVFrame *f1, const AVFrame *f2)
     165             : {
     166             :     int x, y;
     167         135 :     const uint8_t *srcp1 = f1->data[0];
     168         135 :     const uint8_t *srcp2 = f2->data[0];
     169         135 :     const int src1_linesize = f1->linesize[0];
     170         135 :     const int src2_linesize = f2->linesize[0];
     171         135 :     const int width  = f1->width;
     172         135 :     const int height = f1->height;
     173         135 :     int64_t acc = 0;
     174             : 
     175       39015 :     for (y = 0; y < height; y++) {
     176    13724640 :         for (x = 0; x < width; x++)
     177    13685760 :             acc += abs(srcp1[x] - srcp2[x]);
     178       38880 :         srcp1 += src1_linesize;
     179       38880 :         srcp2 += src2_linesize;
     180             :     }
     181         135 :     return acc;
     182             : }
     183             : 
     184         610 : static void fill_buf(uint8_t *data, int w, int h, int linesize, uint8_t v)
     185             : {
     186             :     int y;
     187             : 
     188      157570 :     for (y = 0; y < h; y++) {
     189      156960 :         memset(data, v, w);
     190      156960 :         data += linesize;
     191             :     }
     192         610 : }
     193             : 
     194         220 : static int calc_combed_score(const FieldMatchContext *fm, const AVFrame *src)
     195             : {
     196         220 :     int x, y, plane, max_v = 0;
     197         220 :     const int cthresh = fm->cthresh;
     198         220 :     const int cthresh6 = cthresh * 6;
     199             : 
     200         440 :     for (plane = 0; plane < (fm->chroma ? 3 : 1); plane++) {
     201         220 :         const uint8_t *srcp = src->data[plane];
     202         220 :         const int src_linesize = src->linesize[plane];
     203         220 :         const int width  = get_width (fm, src, plane);
     204         220 :         const int height = get_height(fm, src, plane);
     205         220 :         uint8_t *cmkp = fm->cmask_data[plane];
     206         220 :         const int cmk_linesize = fm->cmask_linesize[plane];
     207             : 
     208         220 :         if (cthresh < 0) {
     209           0 :             fill_buf(cmkp, width, height, cmk_linesize, 0xff);
     210           0 :             continue;
     211             :         }
     212         220 :         fill_buf(cmkp, width, height, cmk_linesize, 0);
     213             : 
     214             :         /* [1 -3 4 -3 1] vertical filter */
     215             : #define FILTER(xm2, xm1, xp1, xp2) \
     216             :         abs(  4 * srcp[x] \
     217             :              -3 * (srcp[x + (xm1)*src_linesize] + srcp[x + (xp1)*src_linesize]) \
     218             :              +    (srcp[x + (xm2)*src_linesize] + srcp[x + (xp2)*src_linesize])) > cthresh6
     219             : 
     220             :         /* first line */
     221       77660 :         for (x = 0; x < width; x++) {
     222       77440 :             const int s1 = abs(srcp[x] - srcp[x + src_linesize]);
     223       77440 :             if (s1 > cthresh && FILTER(2, 1, 1, 2))
     224       40805 :                 cmkp[x] = 0xff;
     225             :         }
     226         220 :         srcp += src_linesize;
     227         220 :         cmkp += cmk_linesize;
     228             : 
     229             :         /* second line */
     230       77660 :         for (x = 0; x < width; x++) {
     231       77440 :             const int s1 = abs(srcp[x] - srcp[x - src_linesize]);
     232       77440 :             const int s2 = abs(srcp[x] - srcp[x + src_linesize]);
     233       77440 :             if (s1 > cthresh && s2 > cthresh && FILTER(2, -1, 1, 2))
     234       37775 :                 cmkp[x] = 0xff;
     235             :         }
     236         220 :         srcp += src_linesize;
     237         220 :         cmkp += cmk_linesize;
     238             : 
     239             :         /* all lines minus first two and last two */
     240       62700 :         for (y = 2; y < height-2; y++) {
     241    22055440 :             for (x = 0; x < width; x++) {
     242    21992960 :                 const int s1 = abs(srcp[x] - srcp[x - src_linesize]);
     243    21992960 :                 const int s2 = abs(srcp[x] - srcp[x + src_linesize]);
     244    21992960 :                 if (s1 > cthresh && s2 > cthresh && FILTER(-2, -1, 1, 2))
     245     9913570 :                     cmkp[x] = 0xff;
     246             :             }
     247       62480 :             srcp += src_linesize;
     248       62480 :             cmkp += cmk_linesize;
     249             :         }
     250             : 
     251             :         /* before-last line */
     252       77660 :         for (x = 0; x < width; x++) {
     253       77440 :             const int s1 = abs(srcp[x] - srcp[x - src_linesize]);
     254       77440 :             const int s2 = abs(srcp[x] - srcp[x + src_linesize]);
     255       77440 :             if (s1 > cthresh && s2 > cthresh && FILTER(-2, -1, 1, -2))
     256       31250 :                 cmkp[x] = 0xff;
     257             :         }
     258         220 :         srcp += src_linesize;
     259         220 :         cmkp += cmk_linesize;
     260             : 
     261             :         /* last line */
     262       77660 :         for (x = 0; x < width; x++) {
     263       77440 :             const int s1 = abs(srcp[x] - srcp[x - src_linesize]);
     264       77440 :             if (s1 > cthresh && FILTER(-2, -1, -1, -2))
     265       35810 :                 cmkp[x] = 0xff;
     266             :         }
     267             :     }
     268             : 
     269         220 :     if (fm->chroma) {
     270           0 :         uint8_t *cmkp  = fm->cmask_data[0];
     271           0 :         uint8_t *cmkpU = fm->cmask_data[1];
     272           0 :         uint8_t *cmkpV = fm->cmask_data[2];
     273           0 :         const int width  = AV_CEIL_RSHIFT(src->width,  fm->hsub);
     274           0 :         const int height = AV_CEIL_RSHIFT(src->height, fm->vsub);
     275           0 :         const int cmk_linesize   = fm->cmask_linesize[0] << 1;
     276           0 :         const int cmk_linesizeUV = fm->cmask_linesize[2];
     277           0 :         uint8_t *cmkpp  = cmkp - (cmk_linesize>>1);
     278           0 :         uint8_t *cmkpn  = cmkp + (cmk_linesize>>1);
     279           0 :         uint8_t *cmkpnn = cmkp +  cmk_linesize;
     280           0 :         for (y = 1; y < height - 1; y++) {
     281           0 :             cmkpp  += cmk_linesize;
     282           0 :             cmkp   += cmk_linesize;
     283           0 :             cmkpn  += cmk_linesize;
     284           0 :             cmkpnn += cmk_linesize;
     285           0 :             cmkpV  += cmk_linesizeUV;
     286           0 :             cmkpU  += cmk_linesizeUV;
     287           0 :             for (x = 1; x < width - 1; x++) {
     288             : #define HAS_FF_AROUND(p, lz) (p[(x)-1 - (lz)] == 0xff || p[(x) - (lz)] == 0xff || p[(x)+1 - (lz)] == 0xff || \
     289             :                               p[(x)-1       ] == 0xff ||                          p[(x)+1       ] == 0xff || \
     290             :                               p[(x)-1 + (lz)] == 0xff || p[(x) + (lz)] == 0xff || p[(x)+1 + (lz)] == 0xff)
     291           0 :                 if ((cmkpV[x] == 0xff && HAS_FF_AROUND(cmkpV, cmk_linesizeUV)) ||
     292           0 :                     (cmkpU[x] == 0xff && HAS_FF_AROUND(cmkpU, cmk_linesizeUV))) {
     293           0 :                     ((uint16_t*)cmkp)[x]  = 0xffff;
     294           0 :                     ((uint16_t*)cmkpn)[x] = 0xffff;
     295           0 :                     if (y&1) ((uint16_t*)cmkpp)[x]  = 0xffff;
     296           0 :                     else     ((uint16_t*)cmkpnn)[x] = 0xffff;
     297             :                 }
     298             :             }
     299             :         }
     300             :     }
     301             : 
     302             :     {
     303         220 :         const int blockx = fm->blockx;
     304         220 :         const int blocky = fm->blocky;
     305         220 :         const int xhalf = blockx/2;
     306         220 :         const int yhalf = blocky/2;
     307         220 :         const int cmk_linesize = fm->cmask_linesize[0];
     308         220 :         const uint8_t *cmkp    = fm->cmask_data[0] + cmk_linesize;
     309         220 :         const int width  = src->width;
     310         220 :         const int height = src->height;
     311         220 :         const int xblocks = ((width+xhalf)/blockx) + 1;
     312         220 :         const int xblocks4 = xblocks<<2;
     313         220 :         const int yblocks = ((height+yhalf)/blocky) + 1;
     314         220 :         int *c_array = fm->c_array;
     315         220 :         const int arraysize = (xblocks*yblocks)<<2;
     316         220 :         int      heighta = (height/(blocky/2))*(blocky/2);
     317         220 :         const int widtha = (width /(blockx/2))*(blockx/2);
     318         220 :         if (heighta == height)
     319         220 :             heighta = height - yhalf;
     320         220 :         memset(c_array, 0, arraysize * sizeof(*c_array));
     321             : 
     322             : #define C_ARRAY_ADD(v) do {                         \
     323             :     const int box1 = (x / blockx) * 4;              \
     324             :     const int box2 = ((x + xhalf) / blockx) * 4;    \
     325             :     c_array[temp1 + box1    ] += v;                 \
     326             :     c_array[temp1 + box2 + 1] += v;                 \
     327             :     c_array[temp2 + box1 + 2] += v;                 \
     328             :     c_array[temp2 + box2 + 3] += v;                 \
     329             : } while (0)
     330             : 
     331             : #define VERTICAL_HALF(y_start, y_end) do {                                  \
     332             :     for (y = y_start; y < y_end; y++) {                                     \
     333             :         const int temp1 = (y / blocky) * xblocks4;                          \
     334             :         const int temp2 = ((y + yhalf) / blocky) * xblocks4;                \
     335             :         for (x = 0; x < width; x++)                                         \
     336             :             if (cmkp[x - cmk_linesize] == 0xff &&                           \
     337             :                 cmkp[x               ] == 0xff &&                           \
     338             :                 cmkp[x + cmk_linesize] == 0xff)                             \
     339             :                 C_ARRAY_ADD(1);                                             \
     340             :         cmkp += cmk_linesize;                                               \
     341             :     }                                                                       \
     342             : } while (0)
     343             : 
     344         220 :         VERTICAL_HALF(1, yhalf);
     345             : 
     346        7700 :         for (y = yhalf; y < heighta; y += yhalf) {
     347        7480 :             const int temp1 = (y / blocky) * xblocks4;
     348        7480 :             const int temp2 = ((y + yhalf) / blocky) * xblocks4;
     349             : 
     350      336600 :             for (x = 0; x < widtha; x += xhalf) {
     351      329120 :                 const uint8_t *cmkp_tmp = cmkp + x;
     352      329120 :                 int u, v, sum = 0;
     353     2962080 :                 for (u = 0; u < yhalf; u++) {
     354    23696640 :                     for (v = 0; v < xhalf; v++)
     355    30567633 :                         if (cmkp_tmp[v - cmk_linesize] == 0xff &&
     356    18089480 :                             cmkp_tmp[v               ] == 0xff &&
     357     8585527 :                             cmkp_tmp[v + cmk_linesize] == 0xff)
     358     7943831 :                             sum++;
     359     2632960 :                     cmkp_tmp += cmk_linesize;
     360             :                 }
     361      329120 :                 if (sum)
     362      203097 :                     C_ARRAY_ADD(sum);
     363             :             }
     364             : 
     365        7480 :             for (x = widtha; x < width; x++) {
     366           0 :                 const uint8_t *cmkp_tmp = cmkp + x;
     367           0 :                 int u, sum = 0;
     368           0 :                 for (u = 0; u < yhalf; u++) {
     369           0 :                     if (cmkp_tmp[-cmk_linesize] == 0xff &&
     370           0 :                         cmkp_tmp[            0] == 0xff &&
     371           0 :                         cmkp_tmp[ cmk_linesize] == 0xff)
     372           0 :                         sum++;
     373           0 :                     cmkp_tmp += cmk_linesize;
     374             :                 }
     375           0 :                 if (sum)
     376           0 :                     C_ARRAY_ADD(sum);
     377             :             }
     378             : 
     379        7480 :             cmkp += cmk_linesize * yhalf;
     380             :         }
     381             : 
     382         220 :         VERTICAL_HALF(heighta, height - 1);
     383             : 
     384      384780 :         for (x = 0; x < arraysize; x++)
     385      384560 :             if (c_array[x] > max_v)
     386         973 :                 max_v = c_array[x];
     387             :     }
     388         220 :     return max_v;
     389             : }
     390             : 
     391             : // the secret is that tbuffer is an interlaced, offset subset of all the lines
     392         390 : static void build_abs_diff_mask(const uint8_t *prvp, int prv_linesize,
     393             :                                 const uint8_t *nxtp, int nxt_linesize,
     394             :                                 uint8_t *tbuffer,    int tbuf_linesize,
     395             :                                 int width, int height)
     396             : {
     397             :     int y, x;
     398             : 
     399         390 :     prvp -= prv_linesize;
     400         390 :     nxtp -= nxt_linesize;
     401       47190 :     for (y = 0; y < height; y++) {
     402    12072528 :         for (x = 0; x < width; x++)
     403    12025728 :             tbuffer[x] = FFABS(prvp[x] - nxtp[x]);
     404       46800 :         prvp += prv_linesize;
     405       46800 :         nxtp += nxt_linesize;
     406       46800 :         tbuffer += tbuf_linesize;
     407             :     }
     408         390 : }
     409             : 
     410             : /**
     411             :  * Build a map over which pixels differ a lot/a little
     412             :  */
     413         390 : static void build_diff_map(FieldMatchContext *fm,
     414             :                            const uint8_t *prvp, int prv_linesize,
     415             :                            const uint8_t *nxtp, int nxt_linesize,
     416             :                            uint8_t *dstp, int dst_linesize, int height,
     417             :                            int width, int plane)
     418             : {
     419             :     int x, y, u, diff, count;
     420         390 :     int tpitch = plane ? fm->tpitchuv : fm->tpitchy;
     421         390 :     const uint8_t *dp = fm->tbuffer + tpitch;
     422             : 
     423         390 :     build_abs_diff_mask(prvp, prv_linesize, nxtp, nxt_linesize,
     424             :                         fm->tbuffer, tpitch, width, height>>1);
     425             : 
     426       46410 :     for (y = 2; y < height - 2; y += 2) {
     427    11796668 :         for (x = 1; x < width - 1; x++) {
     428    11750648 :             diff = dp[x];
     429    11750648 :             if (diff > 3) {
     430    17981804 :                 for (count = 0, u = x-1; u < x+2 && count < 2; u++) {
     431     9251794 :                     count += dp[u-tpitch] > 3;
     432     9251794 :                     count += dp[u       ] > 3;
     433     9251794 :                     count += dp[u+tpitch] > 3;
     434             :                 }
     435     8730010 :                 if (count > 1) {
     436     8722083 :                     dstp[x] = 1;
     437     8722083 :                     if (diff > 19) {
     438     5460375 :                         int upper = 0, lower = 0;
     439    18209862 :                         for (count = 0, u = x-1; u < x+2 && count < 6; u++) {
     440    12749487 :                             if (dp[u-tpitch] > 19) { count++; upper = 1; }
     441    12749487 :                             if (dp[u       ] > 19)   count++;
     442    12749487 :                             if (dp[u+tpitch] > 19) { count++; lower = 1; }
     443             :                         }
     444     5460375 :                         if (count > 3) {
     445     5022758 :                             if (upper && lower) {
     446     4554450 :                                 dstp[x] |= 1<<1;
     447             :                             } else {
     448      468308 :                                 int upper2 = 0, lower2 = 0;
     449     4659994 :                                 for (u = FFMAX(x-4,0); u < FFMIN(x+5,width); u++) {
     450     4191686 :                                     if (y != 2 &&        dp[u-2*tpitch] > 19) upper2 = 1;
     451     4191686 :                                     if (                 dp[u-  tpitch] > 19) upper  = 1;
     452     4191686 :                                     if (                 dp[u+  tpitch] > 19) lower  = 1;
     453     4191686 :                                     if (y != height-4 && dp[u+2*tpitch] > 19) lower2 = 1;
     454             :                                 }
     455      468308 :                                 if ((upper && (lower || upper2)) ||
     456       57479 :                                     (lower && (upper || lower2)))
     457      455472 :                                     dstp[x] |= 1<<1;
     458       12836 :                                 else if (count > 5)
     459        9145 :                                     dstp[x] |= 1<<2;
     460             :                             }
     461             :                         }
     462             :                     }
     463             :                 }
     464             :             }
     465             :         }
     466       46020 :         dp += tpitch;
     467       46020 :         dstp += dst_linesize;
     468             :     }
     469         390 : }
     470             : 
     471             : enum { mP, mC, mN, mB, mU };
     472             : 
     473         780 : static int get_field_base(int match, int field)
     474             : {
     475         780 :     return match < 3 ? 2 - field : 1 + field;
     476             : }
     477             : 
     478         780 : static AVFrame *select_frame(FieldMatchContext *fm, int match)
     479             : {
     480         780 :     if      (match == mP || match == mB) return fm->prv;
     481         390 :     else if (match == mN || match == mU) return fm->nxt;
     482         390 :     else  /* match == mC */              return fm->src;
     483             : }
     484             : 
     485         130 : static int compare_fields(FieldMatchContext *fm, int match1, int match2, int field)
     486             : {
     487             :     int plane, ret;
     488         130 :     uint64_t accumPc = 0, accumPm = 0, accumPml = 0;
     489         130 :     uint64_t accumNc = 0, accumNm = 0, accumNml = 0;
     490             :     int norm1, norm2, mtn1, mtn2;
     491             :     float c1, c2, mr;
     492         130 :     const AVFrame *src = fm->src;
     493             : 
     494         520 :     for (plane = 0; plane < (fm->mchroma ? 3 : 1); plane++) {
     495             :         int x, y, temp1, temp2, fbase;
     496             :         const AVFrame *prev, *next;
     497         390 :         uint8_t *mapp    = fm->map_data[plane];
     498         390 :         int map_linesize = fm->map_linesize[plane];
     499         390 :         const uint8_t *srcp = src->data[plane];
     500         390 :         const int src_linesize  = src->linesize[plane];
     501         390 :         const int srcf_linesize = src_linesize << 1;
     502             :         int prv_linesize,  nxt_linesize;
     503             :         int prvf_linesize, nxtf_linesize;
     504         390 :         const int width  = get_width (fm, src, plane);
     505         390 :         const int height = get_height(fm, src, plane);
     506         390 :         const int y0a = fm->y0 >> (plane != 0);
     507         390 :         const int y1a = fm->y1 >> (plane != 0);
     508         390 :         const int startx = (plane == 0 ? 8 : 4);
     509         390 :         const int stopx  = width - startx;
     510             :         const uint8_t *srcpf, *srcf, *srcnf;
     511             :         const uint8_t *prvpf, *prvnf, *nxtpf, *nxtnf;
     512             : 
     513         390 :         fill_buf(mapp, width, height, map_linesize, 0);
     514             : 
     515             :         /* match1 */
     516         390 :         fbase = get_field_base(match1, field);
     517         390 :         srcf  = srcp + (fbase + 1) * src_linesize;
     518         390 :         srcpf = srcf - srcf_linesize;
     519         390 :         srcnf = srcf + srcf_linesize;
     520         390 :         mapp  = mapp + fbase * map_linesize;
     521         390 :         prev = select_frame(fm, match1);
     522         390 :         prv_linesize  = prev->linesize[plane];
     523         390 :         prvf_linesize = prv_linesize << 1;
     524         390 :         prvpf = prev->data[plane] + fbase * prv_linesize;   // previous frame, previous field
     525         390 :         prvnf = prvpf + prvf_linesize;                      // previous frame, next     field
     526             : 
     527             :         /* match2 */
     528         390 :         fbase = get_field_base(match2, field);
     529         390 :         next = select_frame(fm, match2);
     530         390 :         nxt_linesize  = next->linesize[plane];
     531         390 :         nxtf_linesize = nxt_linesize << 1;
     532         390 :         nxtpf = next->data[plane] + fbase * nxt_linesize;   // next frame, previous field
     533         390 :         nxtnf = nxtpf + nxtf_linesize;                      // next frame, next     field
     534             : 
     535         390 :         map_linesize <<= 1;
     536         390 :         if ((match1 >= 3 && field == 1) || (match1 < 3 && field != 1))
     537           0 :             build_diff_map(fm, prvpf, prvf_linesize, nxtpf, nxtf_linesize,
     538             :                            mapp, map_linesize, height, width, plane);
     539             :         else
     540         390 :             build_diff_map(fm, prvnf, prvf_linesize, nxtnf, nxtf_linesize,
     541             :                            mapp + map_linesize, map_linesize, height, width, plane);
     542             : 
     543       46410 :         for (y = 2; y < height - 2; y += 2) {
     544       46020 :             if (y0a == y1a || y < y0a || y > y1a) {
     545    11372868 :                 for (x = startx; x < stopx; x++) {
     546    11326848 :                     if (mapp[x] > 0 || mapp[x + map_linesize] > 0) {
     547     9146821 :                         temp1 = srcpf[x] + (srcf[x] << 2) + srcnf[x]; // [1 4 1]
     548             : 
     549     9146821 :                         temp2 = abs(3 * (prvpf[x] + prvnf[x]) - temp1);
     550     9146821 :                         if (temp2 > 23 && ((mapp[x]&1) || (mapp[x + map_linesize]&1)))
     551     3925692 :                             accumPc += temp2;
     552     9146821 :                         if (temp2 > 42) {
     553     3357000 :                             if ((mapp[x]&2) || (mapp[x + map_linesize]&2))
     554     2693077 :                                 accumPm += temp2;
     555     3357000 :                             if ((mapp[x]&4) || (mapp[x + map_linesize]&4))
     556        1556 :                                 accumPml += temp2;
     557             :                         }
     558             : 
     559     9146821 :                         temp2 = abs(3 * (nxtpf[x] + nxtnf[x]) - temp1);
     560     9146821 :                         if (temp2 > 23 && ((mapp[x]&1) || (mapp[x + map_linesize]&1)))
     561     6727389 :                             accumNc += temp2;
     562     9146821 :                         if (temp2 > 42) {
     563     5916246 :                             if ((mapp[x]&2) || (mapp[x + map_linesize]&2))
     564     3666067 :                                 accumNm += temp2;
     565     5916246 :                             if ((mapp[x]&4) || (mapp[x + map_linesize]&4))
     566       10835 :                                 accumNml += temp2;
     567             :                         }
     568             :                     }
     569             :                 }
     570             :             }
     571       46020 :             prvpf += prvf_linesize;
     572       46020 :             prvnf += prvf_linesize;
     573       46020 :             srcpf += srcf_linesize;
     574       46020 :             srcf  += srcf_linesize;
     575       46020 :             srcnf += srcf_linesize;
     576       46020 :             nxtpf += nxtf_linesize;
     577       46020 :             nxtnf += nxtf_linesize;
     578       46020 :             mapp  += map_linesize;
     579             :         }
     580             :     }
     581             : 
     582         130 :     if (accumPm < 500 && accumNm < 500 && (accumPml >= 500 || accumNml >= 500) &&
     583           0 :         FFMAX(accumPml,accumNml) > 3*FFMIN(accumPml,accumNml)) {
     584           0 :         accumPm = accumPml;
     585           0 :         accumNm = accumNml;
     586             :     }
     587             : 
     588         130 :     norm1 = (int)((accumPc / 6.0f) + 0.5f);
     589         130 :     norm2 = (int)((accumNc / 6.0f) + 0.5f);
     590         130 :     mtn1  = (int)((accumPm / 6.0f) + 0.5f);
     591         130 :     mtn2  = (int)((accumNm / 6.0f) + 0.5f);
     592         130 :     c1 = ((float)FFMAX(norm1,norm2)) / ((float)FFMAX(FFMIN(norm1,norm2),1));
     593         130 :     c2 = ((float)FFMAX(mtn1, mtn2))  / ((float)FFMAX(FFMIN(mtn1, mtn2), 1));
     594         130 :     mr = ((float)FFMAX(mtn1, mtn2))  / ((float)FFMAX(FFMAX(norm1,norm2),1));
     595         130 :     if (((mtn1 >=  500 || mtn2 >=  500) && (mtn1*2 < mtn2*1 || mtn2*2 < mtn1*1)) ||
     596          10 :         ((mtn1 >= 1000 || mtn2 >= 1000) && (mtn1*3 < mtn2*2 || mtn2*3 < mtn1*2)) ||
     597          10 :         ((mtn1 >= 2000 || mtn2 >= 2000) && (mtn1*5 < mtn2*4 || mtn2*5 < mtn1*4)) ||
     598          10 :         ((mtn1 >= 4000 || mtn2 >= 4000) && c2 > c1))
     599         117 :         ret = mtn1 > mtn2 ? match2 : match1;
     600          13 :     else if (mr > 0.005 && FFMAX(mtn1, mtn2) > 150 && (mtn1*2 < mtn2*1 || mtn2*2 < mtn1*1))
     601           0 :         ret = mtn1 > mtn2 ? match2 : match1;
     602             :     else
     603          13 :         ret = norm1 > norm2 ? match2 : match1;
     604         130 :     return ret;
     605             : }
     606             : 
     607         314 : static void copy_fields(const FieldMatchContext *fm, AVFrame *dst,
     608             :                         const AVFrame *src, int field)
     609             : {
     610             :     int plane;
     611        1256 :     for (plane = 0; plane < 4 && src->data[plane] && src->linesize[plane]; plane++) {
     612         942 :         const int plane_h = get_height(fm, src, plane);
     613         942 :         const int nb_copy_fields = (plane_h >> 1) + (field ? 0 : (plane_h & 1));
     614        2826 :         av_image_copy_plane(dst->data[plane] + field*dst->linesize[plane], dst->linesize[plane] << 1,
     615        1884 :                             src->data[plane] + field*src->linesize[plane], src->linesize[plane] << 1,
     616             :                             get_width(fm, src, plane), nb_copy_fields);
     617             :     }
     618         314 : }
     619             : 
     620         157 : static AVFrame *create_weave_frame(AVFilterContext *ctx, int match, int field,
     621             :                                    const AVFrame *prv, AVFrame *src, const AVFrame *nxt)
     622             : {
     623             :     AVFrame *dst;
     624         157 :     FieldMatchContext *fm = ctx->priv;
     625             : 
     626         157 :     if (match == mC) {
     627           0 :         dst = av_frame_clone(src);
     628             :     } else {
     629         157 :         AVFilterLink *outlink = ctx->outputs[0];
     630             : 
     631         157 :         dst = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     632         157 :         if (!dst)
     633           0 :             return NULL;
     634         157 :         av_frame_copy_props(dst, src);
     635             : 
     636         157 :         switch (match) {
     637          47 :         case mP: copy_fields(fm, dst, src, 1-field); copy_fields(fm, dst, prv,   field); break;
     638         110 :         case mN: copy_fields(fm, dst, src, 1-field); copy_fields(fm, dst, nxt,   field); break;
     639           0 :         case mB: copy_fields(fm, dst, src,   field); copy_fields(fm, dst, prv, 1-field); break;
     640           0 :         case mU: copy_fields(fm, dst, src,   field); copy_fields(fm, dst, nxt, 1-field); break;
     641           0 :         default: av_assert0(0);
     642             :         }
     643             :     }
     644         157 :     return dst;
     645             : }
     646             : 
     647         110 : static int checkmm(AVFilterContext *ctx, int *combs, int m1, int m2,
     648             :                    AVFrame **gen_frames, int field)
     649             : {
     650         110 :     const FieldMatchContext *fm = ctx->priv;
     651             : 
     652             : #define LOAD_COMB(mid) do {                                                     \
     653             :     if (combs[mid] < 0) {                                                       \
     654             :         if (!gen_frames[mid])                                                   \
     655             :             gen_frames[mid] = create_weave_frame(ctx, mid, field,               \
     656             :                                                  fm->prv, fm->src, fm->nxt);    \
     657             :         combs[mid] = calc_combed_score(fm, gen_frames[mid]);                    \
     658             :     }                                                                           \
     659             : } while (0)
     660             : 
     661         110 :     LOAD_COMB(m1);
     662         110 :     LOAD_COMB(m2);
     663             : 
     664         110 :     if ((combs[m2] * 3 < combs[m1] || (combs[m2] * 2 < combs[m1] && combs[m1] > fm->combpel)) &&
     665           0 :         abs(combs[m2] - combs[m1]) >= 30 && combs[m2] < fm->combpel)
     666           0 :         return m2;
     667             :     else
     668         110 :         return m1;
     669             : }
     670             : 
     671             : static const int fxo0m[] = { mP, mC, mN, mB, mU };
     672             : static const int fxo1m[] = { mN, mC, mP, mU, mB };
     673             : 
     674         135 : static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     675             : {
     676         135 :     AVFilterContext *ctx  = inlink->dst;
     677         135 :     AVFilterLink *outlink = ctx->outputs[0];
     678         135 :     FieldMatchContext *fm = ctx->priv;
     679         135 :     int combs[] = { -1, -1, -1, -1, -1 };
     680         135 :     int order, field, i, match, sc = 0;
     681             :     const int *fxo;
     682         135 :     AVFrame *gen_frames[] = { NULL, NULL, NULL, NULL, NULL };
     683             :     AVFrame *dst;
     684             : 
     685             :     /* update frames queue(s) */
     686             : #define SLIDING_FRAME_WINDOW(prv, src, nxt) do {                \
     687             :         if (prv != src) /* 2nd loop exception (1st has prv==src and we don't want to loose src) */ \
     688             :             av_frame_free(&prv);                                \
     689             :         prv = src;                                              \
     690             :         src = nxt;                                              \
     691             :         if (in)                                                 \
     692             :             nxt = in;                                           \
     693             :         if (!prv)                                               \
     694             :             prv = src;                                          \
     695             :         if (!prv) /* received only one frame at that point */   \
     696             :             return 0;                                           \
     697             :         av_assert0(prv && src && nxt);                          \
     698             : } while (0)
     699         135 :     if (FF_INLINK_IDX(inlink) == INPUT_MAIN) {
     700         135 :         SLIDING_FRAME_WINDOW(fm->prv, fm->src, fm->nxt);
     701         130 :         fm->got_frame[INPUT_MAIN] = 1;
     702             :     } else {
     703           0 :         SLIDING_FRAME_WINDOW(fm->prv2, fm->src2, fm->nxt2);
     704           0 :         fm->got_frame[INPUT_CLEANSRC] = 1;
     705             :     }
     706         130 :     if (!fm->got_frame[INPUT_MAIN] || (fm->ppsrc && !fm->got_frame[INPUT_CLEANSRC]))
     707           0 :         return 0;
     708         130 :     fm->got_frame[INPUT_MAIN] = fm->got_frame[INPUT_CLEANSRC] = 0;
     709         130 :     in = fm->src;
     710             : 
     711             :     /* parity */
     712         130 :     order = fm->order != FM_PARITY_AUTO ? fm->order : (in->interlaced_frame ? in->top_field_first : 1);
     713         130 :     field = fm->field != FM_PARITY_AUTO ? fm->field : order;
     714         130 :     av_assert0(order == 0 || order == 1 || field == 0 || field == 1);
     715         130 :     fxo = field ^ order ? fxo1m : fxo0m;
     716             : 
     717             :     /* debug mode: we generate all the fields combinations and their associated
     718             :      * combed score. XXX: inject as frame metadata? */
     719         130 :     if (fm->combdbg) {
     720           0 :         for (i = 0; i < FF_ARRAY_ELEMS(combs); i++) {
     721           0 :             if (i > mN && fm->combdbg == COMBDBG_PCN)
     722           0 :                 break;
     723           0 :             gen_frames[i] = create_weave_frame(ctx, i, field, fm->prv, fm->src, fm->nxt);
     724           0 :             if (!gen_frames[i])
     725           0 :                 return AVERROR(ENOMEM);
     726           0 :             combs[i] = calc_combed_score(fm, gen_frames[i]);
     727             :         }
     728           0 :         av_log(ctx, AV_LOG_INFO, "COMBS: %3d %3d %3d %3d %3d\n",
     729             :                combs[0], combs[1], combs[2], combs[3], combs[4]);
     730             :     } else {
     731         130 :         gen_frames[mC] = av_frame_clone(fm->src);
     732         130 :         if (!gen_frames[mC])
     733           0 :             return AVERROR(ENOMEM);
     734             :     }
     735             : 
     736             :     /* p/c selection and optional 3-way p/c/n matches */
     737         130 :     match = compare_fields(fm, fxo[mC], fxo[mP], field);
     738         130 :     if (fm->mode == MODE_PCN || fm->mode == MODE_PCN_UB)
     739           0 :         match = compare_fields(fm, match, fxo[mN], field);
     740             : 
     741             :     /* scene change check */
     742         130 :     if (fm->combmatch == COMBMATCH_SC) {
     743         130 :         if (fm->lastn == outlink->frame_count_in - 1) {
     744          60 :             if (fm->lastscdiff > fm->scthresh)
     745          45 :                 sc = 1;
     746          70 :         } else if (luma_abs_diff(fm->prv, fm->src) > fm->scthresh) {
     747          20 :             sc = 1;
     748             :         }
     749             : 
     750         130 :         if (!sc) {
     751          65 :             fm->lastn = outlink->frame_count_in;
     752          65 :             fm->lastscdiff = luma_abs_diff(fm->src, fm->nxt);
     753          65 :             sc = fm->lastscdiff > fm->scthresh;
     754             :         }
     755             :     }
     756             : 
     757         130 :     if (fm->combmatch == COMBMATCH_FULL || (fm->combmatch == COMBMATCH_SC && sc)) {
     758         110 :         switch (fm->mode) {
     759             :         /* 2-way p/c matches */
     760           0 :         case MODE_PC:
     761           0 :             match = checkmm(ctx, combs, match, match == fxo[mP] ? fxo[mC] : fxo[mP], gen_frames, field);
     762           0 :             break;
     763         110 :         case MODE_PC_N:
     764         110 :             match = checkmm(ctx, combs, match, fxo[mN], gen_frames, field);
     765         110 :             break;
     766           0 :         case MODE_PC_U:
     767           0 :             match = checkmm(ctx, combs, match, fxo[mU], gen_frames, field);
     768           0 :             break;
     769           0 :         case MODE_PC_N_UB:
     770           0 :             match = checkmm(ctx, combs, match, fxo[mN], gen_frames, field);
     771           0 :             match = checkmm(ctx, combs, match, fxo[mU], gen_frames, field);
     772           0 :             match = checkmm(ctx, combs, match, fxo[mB], gen_frames, field);
     773           0 :             break;
     774             :         /* 3-way p/c/n matches */
     775           0 :         case MODE_PCN:
     776           0 :             match = checkmm(ctx, combs, match, match == fxo[mP] ? fxo[mC] : fxo[mP], gen_frames, field);
     777           0 :             break;
     778           0 :         case MODE_PCN_UB:
     779           0 :             match = checkmm(ctx, combs, match, fxo[mU], gen_frames, field);
     780           0 :             match = checkmm(ctx, combs, match, fxo[mB], gen_frames, field);
     781           0 :             break;
     782           0 :         default:
     783           0 :             av_assert0(0);
     784             :         }
     785             :     }
     786             : 
     787             :     /* get output frame and drop the others */
     788         130 :     if (fm->ppsrc) {
     789             :         /* field matching was based on a filtered/post-processed input, we now
     790             :          * pick the untouched fields from the clean source */
     791           0 :         dst = create_weave_frame(ctx, match, field, fm->prv2, fm->src2, fm->nxt2);
     792             :     } else {
     793         130 :         if (!gen_frames[match]) { // XXX: is that possible?
     794           0 :             dst = create_weave_frame(ctx, match, field, fm->prv, fm->src, fm->nxt);
     795             :         } else {
     796         130 :             dst = gen_frames[match];
     797         130 :             gen_frames[match] = NULL;
     798             :         }
     799             :     }
     800         130 :     if (!dst)
     801           0 :         return AVERROR(ENOMEM);
     802         780 :     for (i = 0; i < FF_ARRAY_ELEMS(gen_frames); i++)
     803         650 :         av_frame_free(&gen_frames[i]);
     804             : 
     805             :     /* mark the frame we are unable to match properly as interlaced so a proper
     806             :      * de-interlacer can take the relay */
     807         130 :     dst->interlaced_frame = combs[match] >= fm->combpel;
     808         130 :     if (dst->interlaced_frame) {
     809         220 :         av_log(ctx, AV_LOG_WARNING, "Frame #%"PRId64" at %s is still interlaced\n",
     810         110 :                outlink->frame_count_in, av_ts2timestr(in->pts, &inlink->time_base));
     811         110 :         dst->top_field_first = field;
     812             :     }
     813             : 
     814         130 :     av_log(ctx, AV_LOG_DEBUG, "SC:%d | COMBS: %3d %3d %3d %3d %3d (combpel=%d)"
     815             :            " match=%d combed=%s\n", sc, combs[0], combs[1], combs[2], combs[3], combs[4],
     816         130 :            fm->combpel, match, dst->interlaced_frame ? "YES" : "NO");
     817             : 
     818         130 :     return ff_filter_frame(outlink, dst);
     819             : }
     820             : 
     821         105 : static int request_inlink(AVFilterContext *ctx, int lid)
     822             : {
     823         105 :     int ret = 0;
     824         105 :     FieldMatchContext *fm = ctx->priv;
     825             : 
     826         105 :     if (!fm->got_frame[lid]) {
     827         105 :         AVFilterLink *inlink = ctx->inputs[lid];
     828         105 :         ret = ff_request_frame(inlink);
     829         105 :         if (ret == AVERROR_EOF) { // flushing
     830           5 :             fm->eof |= 1 << lid;
     831           5 :             ret = filter_frame(inlink, NULL);
     832             :         }
     833             :     }
     834         105 :     return ret;
     835             : }
     836             : 
     837         105 : static int request_frame(AVFilterLink *outlink)
     838             : {
     839             :     int ret;
     840         105 :     AVFilterContext *ctx = outlink->src;
     841         105 :     FieldMatchContext *fm = ctx->priv;
     842         105 :     const uint32_t eof_mask = 1<<INPUT_MAIN | fm->ppsrc<<INPUT_CLEANSRC;
     843             : 
     844         105 :     if ((fm->eof & eof_mask) == eof_mask) // flush done?
     845           0 :         return AVERROR_EOF;
     846         105 :     if ((ret = request_inlink(ctx, INPUT_MAIN)) < 0)
     847           0 :         return ret;
     848         105 :     if (fm->ppsrc && (ret = request_inlink(ctx, INPUT_CLEANSRC)) < 0)
     849           0 :         return ret;
     850         105 :     return 0;
     851             : }
     852             : 
     853           6 : static int query_formats(AVFilterContext *ctx)
     854             : {
     855             :     // TODO: second input source can support >8bit depth
     856             :     static const enum AVPixelFormat pix_fmts[] = {
     857             :         AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,
     858             :         AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,
     859             :         AV_PIX_FMT_NONE
     860             :     };
     861           6 :     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
     862           6 :     if (!fmts_list)
     863           0 :         return AVERROR(ENOMEM);
     864           6 :     return ff_set_common_formats(ctx, fmts_list);
     865             : }
     866             : 
     867           5 : static int config_input(AVFilterLink *inlink)
     868             : {
     869             :     int ret;
     870           5 :     AVFilterContext *ctx = inlink->dst;
     871           5 :     FieldMatchContext *fm = ctx->priv;
     872           5 :     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
     873           5 :     const int w = inlink->w;
     874           5 :     const int h = inlink->h;
     875             : 
     876           5 :     fm->scthresh = (int64_t)((w * h * 255.0 * fm->scthresh_flt) / 100.0);
     877             : 
     878          10 :     if ((ret = av_image_alloc(fm->map_data,   fm->map_linesize,   w, h, inlink->format, 32)) < 0 ||
     879           5 :         (ret = av_image_alloc(fm->cmask_data, fm->cmask_linesize, w, h, inlink->format, 32)) < 0)
     880           0 :         return ret;
     881             : 
     882           5 :     fm->hsub = pix_desc->log2_chroma_w;
     883           5 :     fm->vsub = pix_desc->log2_chroma_h;
     884             : 
     885           5 :     fm->tpitchy  = FFALIGN(w,      16);
     886           5 :     fm->tpitchuv = FFALIGN(w >> 1, 16);
     887             : 
     888           5 :     fm->tbuffer = av_malloc(h/2 * fm->tpitchy);
     889          10 :     fm->c_array = av_malloc((((w + fm->blockx/2)/fm->blockx)+1) *
     890           5 :                             (((h + fm->blocky/2)/fm->blocky)+1) *
     891             :                             4 * sizeof(*fm->c_array));
     892           5 :     if (!fm->tbuffer || !fm->c_array)
     893           0 :         return AVERROR(ENOMEM);
     894             : 
     895           5 :     return 0;
     896             : }
     897             : 
     898           6 : static av_cold int fieldmatch_init(AVFilterContext *ctx)
     899             : {
     900           6 :     const FieldMatchContext *fm = ctx->priv;
     901          12 :     AVFilterPad pad = {
     902           6 :         .name         = av_strdup("main"),
     903             :         .type         = AVMEDIA_TYPE_VIDEO,
     904             :         .filter_frame = filter_frame,
     905             :         .config_props = config_input,
     906             :     };
     907             :     int ret;
     908             : 
     909           6 :     if (!pad.name)
     910           0 :         return AVERROR(ENOMEM);
     911           6 :     if ((ret = ff_insert_inpad(ctx, INPUT_MAIN, &pad)) < 0) {
     912           0 :         av_freep(&pad.name);
     913           0 :         return ret;
     914             :     }
     915             : 
     916           6 :     if (fm->ppsrc) {
     917           0 :         pad.name = av_strdup("clean_src");
     918           0 :         pad.config_props = NULL;
     919           0 :         if (!pad.name)
     920           0 :             return AVERROR(ENOMEM);
     921           0 :         if ((ret = ff_insert_inpad(ctx, INPUT_CLEANSRC, &pad)) < 0) {
     922           0 :             av_freep(&pad.name);
     923           0 :             return ret;
     924             :         }
     925             :     }
     926             : 
     927          12 :     if ((fm->blockx & (fm->blockx - 1)) ||
     928           6 :         (fm->blocky & (fm->blocky - 1))) {
     929           0 :         av_log(ctx, AV_LOG_ERROR, "blockx and blocky settings must be power of two\n");
     930           0 :         return AVERROR(EINVAL);
     931             :     }
     932             : 
     933           6 :     if (fm->combpel > fm->blockx * fm->blocky) {
     934           0 :         av_log(ctx, AV_LOG_ERROR, "Combed pixel should not be larger than blockx x blocky\n");
     935           0 :         return AVERROR(EINVAL);
     936             :     }
     937             : 
     938           6 :     return 0;
     939             : }
     940             : 
     941           6 : static av_cold void fieldmatch_uninit(AVFilterContext *ctx)
     942             : {
     943             :     int i;
     944           6 :     FieldMatchContext *fm = ctx->priv;
     945             : 
     946           6 :     if (fm->prv != fm->src)
     947           5 :         av_frame_free(&fm->prv);
     948           6 :     if (fm->nxt != fm->src)
     949           0 :         av_frame_free(&fm->nxt);
     950           6 :     av_frame_free(&fm->src);
     951           6 :     av_freep(&fm->map_data[0]);
     952           6 :     av_freep(&fm->cmask_data[0]);
     953           6 :     av_freep(&fm->tbuffer);
     954           6 :     av_freep(&fm->c_array);
     955          12 :     for (i = 0; i < ctx->nb_inputs; i++)
     956           6 :         av_freep(&ctx->input_pads[i].name);
     957           6 : }
     958             : 
     959           5 : static int config_output(AVFilterLink *outlink)
     960             : {
     961           5 :     AVFilterContext *ctx  = outlink->src;
     962           5 :     const FieldMatchContext *fm = ctx->priv;
     963           5 :     const AVFilterLink *inlink =
     964           5 :         ctx->inputs[fm->ppsrc ? INPUT_CLEANSRC : INPUT_MAIN];
     965             : 
     966           5 :     outlink->time_base = inlink->time_base;
     967           5 :     outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
     968           5 :     outlink->frame_rate = inlink->frame_rate;
     969           5 :     outlink->w = inlink->w;
     970           5 :     outlink->h = inlink->h;
     971           5 :     return 0;
     972             : }
     973             : 
     974             : static const AVFilterPad fieldmatch_outputs[] = {
     975             :     {
     976             :         .name          = "default",
     977             :         .type          = AVMEDIA_TYPE_VIDEO,
     978             :         .request_frame = request_frame,
     979             :         .config_props  = config_output,
     980             :     },
     981             :     { NULL }
     982             : };
     983             : 
     984             : AVFilter ff_vf_fieldmatch = {
     985             :     .name           = "fieldmatch",
     986             :     .description    = NULL_IF_CONFIG_SMALL("Field matching for inverse telecine."),
     987             :     .query_formats  = query_formats,
     988             :     .priv_size      = sizeof(FieldMatchContext),
     989             :     .init           = fieldmatch_init,
     990             :     .uninit         = fieldmatch_uninit,
     991             :     .inputs         = NULL,
     992             :     .outputs        = fieldmatch_outputs,
     993             :     .priv_class     = &fieldmatch_class,
     994             :     .flags          = AVFILTER_FLAG_DYNAMIC_INPUTS,
     995             : };

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