LCOV - code coverage report
Current view: top level - libavcodec - vp6.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 394 421 93.6 %
Date: 2017-12-18 06:23:41 Functions: 19 19 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
       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             : /**
      22             :  * @file
      23             :  * VP6 compatible video decoder
      24             :  *
      25             :  * The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
      26             :  *  - upper 4 bits: difference between encoded width and visible width
      27             :  *  - lower 4 bits: difference between encoded height and visible height
      28             :  */
      29             : 
      30             : #include <stdlib.h>
      31             : 
      32             : #include "avcodec.h"
      33             : #include "get_bits.h"
      34             : #include "huffman.h"
      35             : #include "internal.h"
      36             : 
      37             : #include "vp56.h"
      38             : #include "vp56data.h"
      39             : #include "vp6data.h"
      40             : 
      41             : #define VP6_MAX_HUFF_SIZE 12
      42             : 
      43             : static int vp6_parse_coeff(VP56Context *s);
      44             : static int vp6_parse_coeff_huffman(VP56Context *s);
      45             : 
      46         713 : static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
      47             : {
      48         713 :     VP56RangeCoder *c = &s->c;
      49         713 :     int parse_filter_info = 0;
      50         713 :     int coeff_offset = 0;
      51         713 :     int vrt_shift = 0;
      52             :     int sub_version;
      53             :     int rows, cols;
      54         713 :     int res = 0;
      55             :     int ret;
      56         713 :     int separated_coeff = buf[0] & 1;
      57             : 
      58         713 :     s->frames[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
      59         713 :     ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
      60             : 
      61         713 :     if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
      62          39 :         sub_version = buf[1] >> 3;
      63          39 :         if (sub_version > 8)
      64           0 :             return AVERROR_INVALIDDATA;
      65          39 :         s->filter_header = buf[1] & 0x06;
      66          39 :         if (buf[1] & 1) {
      67           0 :             avpriv_report_missing_feature(s->avctx, "Interlacing");
      68           0 :             return AVERROR_PATCHWELCOME;
      69             :         }
      70          39 :         if (separated_coeff || !s->filter_header) {
      71          11 :             coeff_offset = AV_RB16(buf+2) - 2;
      72          11 :             buf += 2;
      73          11 :             buf_size -= 2;
      74             :         }
      75             : 
      76          39 :         rows = buf[2];  /* number of stored macroblock rows */
      77          39 :         cols = buf[3];  /* number of stored macroblock cols */
      78             :         /* buf[4] is number of displayed macroblock rows */
      79             :         /* buf[5] is number of displayed macroblock cols */
      80          39 :         if (!rows || !cols) {
      81           0 :             av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", cols << 4, rows << 4);
      82           0 :             return AVERROR_INVALIDDATA;
      83             :         }
      84             : 
      85          67 :         if (!s->macroblocks || /* first frame */
      86          56 :             16*cols != s->avctx->coded_width ||
      87          28 :             16*rows != s->avctx->coded_height) {
      88          20 :             if (s->avctx->extradata_size == 0 &&
      89          13 :                 FFALIGN(s->avctx->width,  16) == 16 * cols &&
      90           4 :                 FFALIGN(s->avctx->height, 16) == 16 * rows) {
      91             :                 // We assume this is properly signalled container cropping,
      92             :                 // in an F4V file. Just set the coded_width/height, don't
      93             :                 // touch the cropped ones.
      94           4 :                 s->avctx->coded_width  = 16 * cols;
      95           4 :                 s->avctx->coded_height = 16 * rows;
      96             :             } else {
      97           7 :                 ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
      98           7 :                 if (ret < 0)
      99           0 :                     return ret;
     100             : 
     101           7 :                 if (s->avctx->extradata_size == 1) {
     102           2 :                     s->avctx->width  -= s->avctx->extradata[0] >> 4;
     103           2 :                     s->avctx->height -= s->avctx->extradata[0] & 0x0F;
     104             :                 }
     105             :             }
     106          11 :             res = VP56_SIZE_CHANGE;
     107             :         }
     108             : 
     109          39 :         ret = ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
     110          39 :         if (ret < 0)
     111           0 :             goto fail;
     112          39 :         vp56_rac_gets(c, 2);
     113             : 
     114          39 :         parse_filter_info = s->filter_header;
     115          39 :         if (sub_version < 8)
     116          14 :             vrt_shift = 5;
     117          39 :         s->sub_version = sub_version;
     118          39 :         s->golden_frame = 0;
     119             :     } else {
     120         674 :         if (!s->sub_version || !s->avctx->coded_width || !s->avctx->coded_height)
     121           0 :             return AVERROR_INVALIDDATA;
     122             : 
     123         674 :         if (separated_coeff || !s->filter_header) {
     124         126 :             coeff_offset = AV_RB16(buf+1) - 2;
     125         126 :             buf += 2;
     126         126 :             buf_size -= 2;
     127             :         }
     128         674 :         ret = ff_vp56_init_range_decoder(c, buf+1, buf_size-1);
     129         674 :         if (ret < 0)
     130           0 :             return ret;
     131             : 
     132         674 :         s->golden_frame = vp56_rac_get(c);
     133         674 :         if (s->filter_header) {
     134         548 :             s->deblock_filtering = vp56_rac_get(c);
     135         548 :             if (s->deblock_filtering)
     136         548 :                 vp56_rac_get(c);
     137         548 :             if (s->sub_version > 7)
     138         429 :                 parse_filter_info = vp56_rac_get(c);
     139             :         }
     140             :     }
     141             : 
     142         713 :     if (parse_filter_info) {
     143         167 :         if (vp56_rac_get(c)) {
     144         167 :             s->filter_mode = 2;
     145         167 :             s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
     146         167 :             s->max_vector_length = 2 << vp56_rac_gets(c, 3);
     147           0 :         } else if (vp56_rac_get(c)) {
     148           0 :             s->filter_mode = 1;
     149             :         } else {
     150           0 :             s->filter_mode = 0;
     151             :         }
     152         167 :         if (s->sub_version > 7)
     153         164 :             s->filter_selection = vp56_rac_gets(c, 4);
     154             :         else
     155           3 :             s->filter_selection = 16;
     156             :     }
     157             : 
     158         713 :     s->use_huffman = vp56_rac_get(c);
     159             : 
     160         713 :     s->parse_coeff = vp6_parse_coeff;
     161         713 :     if (coeff_offset) {
     162         137 :         buf      += coeff_offset;
     163         137 :         buf_size -= coeff_offset;
     164         137 :         if (buf_size < 0) {
     165           0 :             ret = AVERROR_INVALIDDATA;
     166           0 :             goto fail;
     167             :         }
     168         137 :         if (s->use_huffman) {
     169         117 :             s->parse_coeff = vp6_parse_coeff_huffman;
     170         117 :             init_get_bits(&s->gb, buf, buf_size<<3);
     171             :         } else {
     172          20 :             ret = ff_vp56_init_range_decoder(&s->cc, buf, buf_size);
     173          20 :             if (ret < 0)
     174           0 :                 goto fail;
     175          20 :             s->ccp = &s->cc;
     176             :         }
     177             :     } else {
     178         576 :         s->ccp = &s->c;
     179             :     }
     180             : 
     181         713 :     return res;
     182           0 : fail:
     183           0 :     if (res == VP56_SIZE_CHANGE)
     184           0 :         ff_set_dimensions(s->avctx, 0, 0);
     185           0 :     return ret;
     186             : }
     187             : 
     188          40 : static void vp6_coeff_order_table_init(VP56Context *s)
     189             : {
     190          40 :     int i, pos, idx = 1;
     191             : 
     192          40 :     s->modelp->coeff_index_to_pos[0] = 0;
     193         680 :     for (i=0; i<16; i++)
     194       40960 :         for (pos=1; pos<64; pos++)
     195       40320 :             if (s->modelp->coeff_reorder[pos] == i)
     196        2520 :                 s->modelp->coeff_index_to_pos[idx++] = pos;
     197          40 : }
     198             : 
     199          39 : static void vp6_default_models_init(VP56Context *s)
     200             : {
     201          39 :     VP56Model *model = s->modelp;
     202             : 
     203          39 :     model->vector_dct[0] = 0xA2;
     204          39 :     model->vector_dct[1] = 0xA4;
     205          39 :     model->vector_sig[0] = 0x80;
     206          39 :     model->vector_sig[1] = 0x80;
     207             : 
     208          39 :     memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
     209          39 :     memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
     210          39 :     memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
     211          39 :     memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
     212          39 :     memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
     213             : 
     214          39 :     vp6_coeff_order_table_init(s);
     215          39 : }
     216             : 
     217         674 : static void vp6_parse_vector_models(VP56Context *s)
     218             : {
     219         674 :     VP56RangeCoder *c = &s->c;
     220         674 :     VP56Model *model = s->modelp;
     221             :     int comp, node;
     222             : 
     223        2022 :     for (comp=0; comp<2; comp++) {
     224        1348 :         if (vp56_rac_get_prob_branchy(c, vp6_sig_dct_pct[comp][0]))
     225         109 :             model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
     226        1348 :         if (vp56_rac_get_prob_branchy(c, vp6_sig_dct_pct[comp][1]))
     227          17 :             model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
     228             :     }
     229             : 
     230        2022 :     for (comp=0; comp<2; comp++)
     231       10784 :         for (node=0; node<7; node++)
     232        9436 :             if (vp56_rac_get_prob_branchy(c, vp6_pdv_pct[comp][node]))
     233          24 :                 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
     234             : 
     235        2022 :     for (comp=0; comp<2; comp++)
     236       12132 :         for (node=0; node<8; node++)
     237       10784 :             if (vp56_rac_get_prob_branchy(c, vp6_fdv_pct[comp][node]))
     238          10 :                 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
     239         674 : }
     240             : 
     241             : /* nodes must ascend by count, but with descending symbol order */
     242      149929 : static int vp6_huff_cmp(const void *va, const void *vb)
     243             : {
     244      149929 :     const Node *a = va, *b = vb;
     245      149929 :     return (a->count - b->count)*16 + (b->sym - a->sym);
     246             : }
     247             : 
     248        4680 : static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
     249             :                                const uint8_t *map, unsigned size, VLC *vlc)
     250             : {
     251        4680 :     Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
     252             :     int a, b, i;
     253             : 
     254             :     /* first compute probabilities from model */
     255        4680 :     tmp[0].count = 256;
     256       55458 :     for (i=0; i<size-1; i++) {
     257       50778 :         a = tmp[i].count *        coeff_model[i]  >> 8;
     258       50778 :         b = tmp[i].count * (255 - coeff_model[i]) >> 8;
     259       50778 :         nodes[map[2*i  ]].count = a + !a;
     260       50778 :         nodes[map[2*i+1]].count = b + !b;
     261             :     }
     262             : 
     263        4680 :     ff_free_vlc(vlc);
     264             :     /* then build the huffman tree according to probabilities */
     265        4680 :     return ff_huff_build_tree(s->avctx, vlc, size, FF_HUFFMAN_BITS,
     266             :                               nodes, vp6_huff_cmp,
     267             :                               FF_HUFFMAN_FLAG_HNODE_FIRST);
     268             : }
     269             : 
     270         713 : static int vp6_parse_coeff_models(VP56Context *s)
     271             : {
     272         713 :     VP56RangeCoder *c = &s->c;
     273         713 :     VP56Model *model = s->modelp;
     274             :     int def_prob[11];
     275             :     int node, cg, ctx, pos;
     276             :     int ct;    /* code type */
     277             :     int pt;    /* plane type (0 for Y, 1 for U or V) */
     278             : 
     279         713 :     memset(def_prob, 0x80, sizeof(def_prob));
     280             : 
     281        2139 :     for (pt=0; pt<2; pt++)
     282       17112 :         for (node=0; node<11; node++)
     283       15686 :             if (vp56_rac_get_prob_branchy(c, vp6_dccv_pct[pt][node])) {
     284        1101 :                 def_prob[node] = vp56_rac_gets_nn(c, 7);
     285        1101 :                 model->coeff_dccv[pt][node] = def_prob[node];
     286       14585 :             } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
     287         562 :                 model->coeff_dccv[pt][node] = def_prob[node];
     288             :             }
     289             : 
     290         713 :     if (vp56_rac_get(c)) {
     291          64 :         for (pos=1; pos<64; pos++)
     292          63 :             if (vp56_rac_get_prob_branchy(c, vp6_coeff_reorder_pct[pos]))
     293           0 :                 model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
     294           1 :         vp6_coeff_order_table_init(s);
     295             :     }
     296             : 
     297        2139 :     for (cg=0; cg<2; cg++)
     298       21390 :         for (node=0; node<14; node++)
     299       19964 :             if (vp56_rac_get_prob_branchy(c, vp6_runv_pct[cg][node]))
     300         812 :                 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
     301             : 
     302        2852 :     for (ct=0; ct<3; ct++)
     303        6417 :         for (pt=0; pt<2; pt++)
     304       29946 :             for (cg=0; cg<6; cg++)
     305      308016 :                 for (node=0; node<11; node++)
     306      282348 :                     if (vp56_rac_get_prob_branchy(c, vp6_ract_pct[ct][pt][cg][node])) {
     307        4801 :                         def_prob[node] = vp56_rac_gets_nn(c, 7);
     308        4801 :                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
     309      277547 :                     } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
     310       13830 :                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
     311             :                     }
     312             : 
     313         713 :     if (s->use_huffman) {
     314         351 :         for (pt=0; pt<2; pt++) {
     315         234 :             if (vp6_build_huff_tree(s, model->coeff_dccv[pt],
     316             :                                     vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]))
     317           0 :                 return -1;
     318         234 :             if (vp6_build_huff_tree(s, model->coeff_runv[pt],
     319             :                                     vp6_huff_run_map, 9, &s->runv_vlc[pt]))
     320           0 :                 return -1;
     321         936 :             for (ct=0; ct<3; ct++)
     322        4914 :                 for (cg = 0; cg < 6; cg++)
     323        4212 :                     if (vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
     324             :                                             vp6_huff_coeff_map, 12,
     325             :                                             &s->ract_vlc[pt][ct][cg]))
     326           0 :                         return -1;
     327             :         }
     328         117 :         memset(s->nb_null, 0, sizeof(s->nb_null));
     329             :     } else {
     330             :     /* coeff_dcct is a linear combination of coeff_dccv */
     331        1788 :     for (pt=0; pt<2; pt++)
     332        4768 :         for (ctx=0; ctx<3; ctx++)
     333       21456 :             for (node=0; node<5; node++)
     334       17880 :                 model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
     335             :     }
     336         713 :     return 0;
     337             : }
     338             : 
     339       18340 : static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
     340             : {
     341       18340 :     VP56RangeCoder *c = &s->c;
     342       18340 :     VP56Model *model = s->modelp;
     343             :     int comp;
     344             : 
     345       18340 :     *vect = (VP56mv) {0,0};
     346       18340 :     if (s->vector_candidate_pos < 2)
     347       15667 :         *vect = s->vector_candidate[0];
     348             : 
     349       55020 :     for (comp=0; comp<2; comp++) {
     350       36680 :         int i, delta = 0;
     351             : 
     352       36680 :         if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
     353             :             static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
     354       68968 :             for (i=0; i<sizeof(prob_order); i++) {
     355       60347 :                 int j = prob_order[i];
     356       60347 :                 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
     357             :             }
     358        8621 :             if (delta & 0xF0)
     359        4328 :                 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
     360             :             else
     361        4293 :                 delta |= 8;
     362             :         } else {
     363       28059 :             delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
     364       28059 :                                       model->vector_pdv[comp]);
     365             :         }
     366             : 
     367       36680 :         if (delta && vp56_rac_get_prob_branchy(c, model->vector_sig[comp]))
     368       13620 :             delta = -delta;
     369             : 
     370       36680 :         if (!comp)
     371       18340 :             vect->x += delta;
     372             :         else
     373       18340 :             vect->y += delta;
     374             :     }
     375       18340 : }
     376             : 
     377             : /**
     378             :  * Read number of consecutive blocks with null DC or AC.
     379             :  * This value is < 74.
     380             :  */
     381       28576 : static unsigned vp6_get_nb_null(VP56Context *s)
     382             : {
     383       28576 :     unsigned val = get_bits(&s->gb, 2);
     384       28576 :     if (val == 2)
     385        4892 :         val += get_bits(&s->gb, 2);
     386       23684 :     else if (val == 3) {
     387         806 :         val = get_bits1(&s->gb) << 2;
     388         806 :         val = 6+val + get_bits(&s->gb, 2+val);
     389             :     }
     390       28576 :     return val;
     391             : }
     392             : 
     393       16848 : static int vp6_parse_coeff_huffman(VP56Context *s)
     394             : {
     395       16848 :     VP56Model *model = s->modelp;
     396       16848 :     uint8_t *permute = s->idct_scantable;
     397             :     VLC *vlc_coeff;
     398             :     int coeff, sign, coeff_idx;
     399             :     int b, cg, idx;
     400       16848 :     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
     401             : 
     402      117936 :     for (b=0; b<6; b++) {
     403      101088 :         int ct = 0;    /* code type */
     404      101088 :         if (b > 3) pt = 1;
     405      101088 :         vlc_coeff = &s->dccv_vlc[pt];
     406             : 
     407     1161120 :         for (coeff_idx = 0;;) {
     408     1161120 :             int run = 1;
     409     1161120 :             if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
     410       28871 :                 s->nb_null[coeff_idx][pt]--;
     411       46380 :                 if (coeff_idx)
     412       11362 :                     break;
     413             :             } else {
     414     1132249 :                 if (get_bits_left(&s->gb) <= 0)
     415           0 :                     return AVERROR_INVALIDDATA;
     416     1132249 :                 coeff = get_vlc2(&s->gb, vlc_coeff->table, FF_HUFFMAN_BITS, 3);
     417     1132249 :                 if (coeff == 0) {
     418      345601 :                     if (coeff_idx) {
     419      326823 :                         int pt = (coeff_idx >= 6);
     420      326823 :                         run += get_vlc2(&s->gb, s->runv_vlc[pt].table, FF_HUFFMAN_BITS, 3);
     421      326823 :                         if (run >= 9)
     422       60162 :                             run += get_bits(&s->gb, 6);
     423             :                     } else
     424       18778 :                         s->nb_null[0][pt] = vp6_get_nb_null(s);
     425      345601 :                     ct = 0;
     426      786648 :                 } else if (coeff == 11) {  /* end of block */
     427       88872 :                     if (coeff_idx == 1)    /* first AC coeff ? */
     428        9798 :                         s->nb_null[1][pt] = vp6_get_nb_null(s);
     429       88872 :                     break;
     430             :                 } else {
     431      697776 :                     int coeff2 = ff_vp56_coeff_bias[coeff];
     432      697776 :                     if (coeff > 4)
     433       39048 :                         coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
     434      697776 :                     ct = 1 + (coeff2 > 1);
     435      697776 :                     sign = get_bits1(&s->gb);
     436      697776 :                     coeff2 = (coeff2 ^ -sign) + sign;
     437      697776 :                     if (coeff_idx)
     438      632975 :                         coeff2 *= s->dequant_ac;
     439      697776 :                     idx = model->coeff_index_to_pos[coeff_idx];
     440      697776 :                     s->block_coeff[b][permute[idx]] = coeff2;
     441             :                 }
     442             :             }
     443     1060886 :             coeff_idx+=run;
     444     1060886 :             if (coeff_idx >= 64)
     445         854 :                 break;
     446     1060032 :             cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
     447     1060032 :             vlc_coeff = &s->ract_vlc[pt][ct][cg];
     448             :         }
     449             :     }
     450       16848 :     return 0;
     451             : }
     452             : 
     453       78707 : static int vp6_parse_coeff(VP56Context *s)
     454             : {
     455       78707 :     VP56RangeCoder *c = s->ccp;
     456       78707 :     VP56Model *model = s->modelp;
     457       78707 :     uint8_t *permute = s->idct_scantable;
     458             :     uint8_t *model1, *model2, *model3;
     459             :     int coeff, sign, coeff_idx;
     460             :     int b, i, cg, idx, ctx;
     461       78707 :     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
     462             : 
     463       78707 :     if (c->end <= c->buffer && c->bits >= 0) {
     464           0 :         av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp6_parse_coeff\n");
     465           0 :         return AVERROR_INVALIDDATA;
     466             :     }
     467             : 
     468      550949 :     for (b=0; b<6; b++) {
     469      472242 :         int ct = 1;    /* code type */
     470      472242 :         int run = 1;
     471             : 
     472      472242 :         if (b > 3) pt = 1;
     473             : 
     474      944484 :         ctx = s->left_block[ff_vp56_b6to4[b]].not_null_dc
     475      472242 :               + s->above_blocks[s->above_block_idx[b]].not_null_dc;
     476      472242 :         model1 = model->coeff_dccv[pt];
     477      472242 :         model2 = model->coeff_dcct[pt][ctx];
     478             : 
     479      472242 :         coeff_idx = 0;
     480             :         for (;;) {
     481     3205368 :             if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob_branchy(c, model2[0])) {
     482             :                 /* parse a coeff */
     483      671305 :                 if (vp56_rac_get_prob_branchy(c, model2[2])) {
     484      159041 :                     if (vp56_rac_get_prob_branchy(c, model2[3])) {
     485       33140 :                         idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
     486       33140 :                         coeff = ff_vp56_coeff_bias[idx+5];
     487      105809 :                         for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
     488       72669 :                             coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
     489             :                     } else {
     490      125901 :                         if (vp56_rac_get_prob_branchy(c, model2[4]))
     491       39387 :                             coeff = 3 + vp56_rac_get_prob(c, model1[5]);
     492             :                         else
     493       86514 :                             coeff = 2;
     494             :                     }
     495      159041 :                     ct = 2;
     496             :                 } else {
     497      512264 :                     ct = 1;
     498      512264 :                     coeff = 1;
     499             :                 }
     500      671305 :                 sign = vp56_rac_get(c);
     501      671305 :                 coeff = (coeff ^ -sign) + sign;
     502      671305 :                 if (coeff_idx)
     503      594035 :                     coeff *= s->dequant_ac;
     504      671305 :                 idx = model->coeff_index_to_pos[coeff_idx];
     505      671305 :                 s->block_coeff[b][permute[idx]] = coeff;
     506      671305 :                 run = 1;
     507             :             } else {
     508             :                 /* parse a run */
     509     1167500 :                 ct = 0;
     510     1167500 :                 if (coeff_idx > 0) {
     511      772528 :                     if (!vp56_rac_get_prob_branchy(c, model2[1]))
     512      471292 :                         break;
     513             : 
     514      301236 :                     model3 = model->coeff_runv[coeff_idx >= 6];
     515      301236 :                     run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
     516      301236 :                     if (!run)
     517      343273 :                         for (run=9, i=0; i<6; i++)
     518      294234 :                             run += vp56_rac_get_prob(c, model3[i+8]) << i;
     519             :                 }
     520             :             }
     521     1367513 :             coeff_idx += run;
     522     1367513 :             if (coeff_idx >= 64)
     523         950 :                 break;
     524     1366563 :             cg = vp6_coeff_groups[coeff_idx];
     525     1366563 :             model1 = model2 = model->coeff_ract[pt][ct][cg];
     526             :         }
     527             : 
     528      944484 :         s->left_block[ff_vp56_b6to4[b]].not_null_dc =
     529      944484 :         s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
     530             :     }
     531       78707 :     return 0;
     532             : }
     533             : 
     534       84892 : static int vp6_block_variance(uint8_t *src, ptrdiff_t stride)
     535             : {
     536       84892 :     int sum = 0, square_sum = 0;
     537             :     int y, x;
     538             : 
     539      424460 :     for (y=0; y<8; y+=2) {
     540     1697840 :         for (x=0; x<8; x+=2) {
     541     1358272 :             sum += src[x];
     542     1358272 :             square_sum += src[x]*src[x];
     543             :         }
     544      339568 :         src += 2*stride;
     545             :     }
     546       84892 :     return (16*square_sum - sum*sum) >> 8;
     547             : }
     548             : 
     549       32656 : static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
     550             :                            int delta, const int16_t *weights)
     551             : {
     552             :     int x, y;
     553             : 
     554      293904 :     for (y=0; y<8; y++) {
     555     2351232 :         for (x=0; x<8; x++) {
     556     4179968 :             dst[x] = av_clip_uint8((  src[x-delta  ] * weights[0]
     557     2089984 :                                  + src[x        ] * weights[1]
     558     2089984 :                                  + src[x+delta  ] * weights[2]
     559     2089984 :                                  + src[x+2*delta] * weights[3] + 64) >> 7);
     560             :         }
     561      261248 :         src += stride;
     562      261248 :         dst += stride;
     563             :     }
     564       32656 : }
     565             : 
     566       49979 : static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
     567             :                              ptrdiff_t stride, int h_weight, int v_weight)
     568             : {
     569       49979 :     uint8_t *tmp = s->edge_emu_buffer+16;
     570       49979 :     s->h264chroma.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
     571       49979 :     s->h264chroma.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
     572       49979 : }
     573             : 
     574      168378 : static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
     575             :                        int offset1, int offset2, ptrdiff_t stride,
     576             :                        VP56mv mv, int mask, int select, int luma)
     577             : {
     578      168378 :     int filter4 = 0;
     579      168378 :     int x8 = mv.x & mask;
     580      168378 :     int y8 = mv.y & mask;
     581             : 
     582      168378 :     if (luma) {
     583      116166 :         x8 *= 2;
     584      116166 :         y8 *= 2;
     585      116166 :         filter4 = s->filter_mode;
     586      116166 :         if (filter4 == 2) {
     587      210634 :             if (s->max_vector_length &&
     588      197869 :                 (FFABS(mv.x) > s->max_vector_length ||
     589       92552 :                  FFABS(mv.y) > s->max_vector_length)) {
     590       20425 :                 filter4 = 0;
     591       84892 :             } else if (s->sample_variance_threshold
     592      169784 :                        && (vp6_block_variance(src+offset1, stride)
     593       84892 :                            < s->sample_variance_threshold)) {
     594       24861 :                 filter4 = 0;
     595             :             }
     596             :         }
     597             :     }
     598             : 
     599      168378 :     if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
     600       87543 :         offset1 = offset2;
     601             :     }
     602             : 
     603      168378 :     if (filter4) {
     604       60031 :         if (!y8) {                      /* left or right combine */
     605       12006 :             vp6_filter_hv4(dst, src+offset1, stride, 1,
     606       12006 :                            vp6_block_copy_filter[select][x8]);
     607       48025 :         } else if (!x8) {               /* above or below combine */
     608       20650 :             vp6_filter_hv4(dst, src+offset1, stride, stride,
     609       20650 :                            vp6_block_copy_filter[select][y8]);
     610             :         } else {
     611       54750 :             s->vp56dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
     612       27375 :                              vp6_block_copy_filter[select][x8],
     613       27375 :                              vp6_block_copy_filter[select][y8]);
     614             :         }
     615             :     } else {
     616      108347 :         if (!x8 || !y8) {
     617       58368 :             s->h264chroma.put_h264_chroma_pixels_tab[0](dst, src + offset1, stride, 8, x8, y8);
     618             :         } else {
     619       49979 :             vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
     620             :         }
     621             :     }
     622      168378 : }
     623             : 
     624             : static av_cold void vp6_decode_init_context(VP56Context *s);
     625             : 
     626          13 : static av_cold int vp6_decode_init(AVCodecContext *avctx)
     627             : {
     628          13 :     VP56Context *s = avctx->priv_data;
     629             :     int ret;
     630             : 
     631          13 :     if ((ret = ff_vp56_init(avctx, avctx->codec->id == AV_CODEC_ID_VP6,
     632          13 :                             avctx->codec->id == AV_CODEC_ID_VP6A)) < 0)
     633           0 :         return ret;
     634          13 :     ff_vp6dsp_init(&s->vp56dsp);
     635             : 
     636          13 :     vp6_decode_init_context(s);
     637             : 
     638          13 :     if (s->has_alpha) {
     639           4 :         s->alpha_context = av_mallocz(sizeof(VP56Context));
     640           8 :         ff_vp56_init_context(avctx, s->alpha_context,
     641           4 :                              s->flip == -1, s->has_alpha);
     642           4 :         ff_vp6dsp_init(&s->alpha_context->vp56dsp);
     643           4 :         vp6_decode_init_context(s->alpha_context);
     644             :     }
     645             : 
     646          13 :     return 0;
     647             : }
     648             : 
     649          17 : static av_cold void vp6_decode_init_context(VP56Context *s)
     650             : {
     651          17 :     s->deblock_filtering = 0;
     652          17 :     s->vp56_coord_div = vp6_coord_div;
     653          17 :     s->parse_vector_adjustment = vp6_parse_vector_adjustment;
     654          17 :     s->filter = vp6_filter;
     655          17 :     s->default_models_init = vp6_default_models_init;
     656          17 :     s->parse_vector_models = vp6_parse_vector_models;
     657          17 :     s->parse_coeff_models = vp6_parse_coeff_models;
     658          17 :     s->parse_header = vp6_parse_header;
     659          17 : }
     660             : 
     661             : static av_cold void vp6_decode_free_context(VP56Context *s);
     662             : 
     663          13 : static av_cold int vp6_decode_free(AVCodecContext *avctx)
     664             : {
     665          13 :     VP56Context *s = avctx->priv_data;
     666             : 
     667          13 :     ff_vp56_free(avctx);
     668          13 :     vp6_decode_free_context(s);
     669             : 
     670          13 :     if (s->alpha_context) {
     671           4 :         ff_vp56_free_context(s->alpha_context);
     672           4 :         vp6_decode_free_context(s->alpha_context);
     673           4 :         av_freep(&s->alpha_context);
     674             :     }
     675             : 
     676          13 :     return 0;
     677             : }
     678             : 
     679          17 : static av_cold void vp6_decode_free_context(VP56Context *s)
     680             : {
     681             :     int pt, ct, cg;
     682             : 
     683          51 :     for (pt=0; pt<2; pt++) {
     684          34 :         ff_free_vlc(&s->dccv_vlc[pt]);
     685          34 :         ff_free_vlc(&s->runv_vlc[pt]);
     686         136 :         for (ct=0; ct<3; ct++)
     687         714 :             for (cg=0; cg<6; cg++)
     688         612 :                 ff_free_vlc(&s->ract_vlc[pt][ct][cg]);
     689             :     }
     690          17 : }
     691             : 
     692             : AVCodec ff_vp6_decoder = {
     693             :     .name           = "vp6",
     694             :     .long_name      = NULL_IF_CONFIG_SMALL("On2 VP6"),
     695             :     .type           = AVMEDIA_TYPE_VIDEO,
     696             :     .id             = AV_CODEC_ID_VP6,
     697             :     .priv_data_size = sizeof(VP56Context),
     698             :     .init           = vp6_decode_init,
     699             :     .close          = vp6_decode_free,
     700             :     .decode         = ff_vp56_decode_frame,
     701             :     .capabilities   = AV_CODEC_CAP_DR1,
     702             : };
     703             : 
     704             : /* flash version, not flipped upside-down */
     705             : AVCodec ff_vp6f_decoder = {
     706             :     .name           = "vp6f",
     707             :     .long_name      = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
     708             :     .type           = AVMEDIA_TYPE_VIDEO,
     709             :     .id             = AV_CODEC_ID_VP6F,
     710             :     .priv_data_size = sizeof(VP56Context),
     711             :     .init           = vp6_decode_init,
     712             :     .close          = vp6_decode_free,
     713             :     .decode         = ff_vp56_decode_frame,
     714             :     .capabilities   = AV_CODEC_CAP_DR1,
     715             : };
     716             : 
     717             : /* flash version, not flipped upside-down, with alpha channel */
     718             : AVCodec ff_vp6a_decoder = {
     719             :     .name           = "vp6a",
     720             :     .long_name      = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
     721             :     .type           = AVMEDIA_TYPE_VIDEO,
     722             :     .id             = AV_CODEC_ID_VP6A,
     723             :     .priv_data_size = sizeof(VP56Context),
     724             :     .init           = vp6_decode_init,
     725             :     .close          = vp6_decode_free,
     726             :     .decode         = ff_vp56_decode_frame,
     727             :     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
     728             : };

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