LCOV - code coverage report
Current view: top level - libavcodec - vp5.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 171 180 95.0 %
Date: 2017-12-11 04:34:20 Functions: 7 7 100.0 %

          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             :  * VP5 compatible video decoder
      24             :  */
      25             : 
      26             : #include <stdlib.h>
      27             : #include <string.h>
      28             : 
      29             : #include "avcodec.h"
      30             : #include "internal.h"
      31             : 
      32             : #include "vp56.h"
      33             : #include "vp56data.h"
      34             : #include "vp5data.h"
      35             : 
      36             : 
      37         247 : static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
      38             : {
      39         247 :     VP56RangeCoder *c = &s->c;
      40             :     int rows, cols;
      41             :     int ret;
      42             : 
      43         247 :     ret = ff_vp56_init_range_decoder(&s->c, buf, buf_size);
      44         247 :     if (ret < 0)
      45           0 :         return ret;
      46         247 :     s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
      47         247 :     vp56_rac_get(c);
      48         247 :     ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
      49         247 :     if (s->frames[VP56_FRAME_CURRENT]->key_frame)
      50             :     {
      51           5 :         vp56_rac_gets(c, 8);
      52           5 :         if(vp56_rac_gets(c, 5) > 5)
      53           0 :             return AVERROR_INVALIDDATA;
      54           5 :         vp56_rac_gets(c, 2);
      55           5 :         if (vp56_rac_get(c)) {
      56           0 :             avpriv_report_missing_feature(s->avctx, "Interlacing");
      57           0 :             return AVERROR_PATCHWELCOME;
      58             :         }
      59           5 :         rows = vp56_rac_gets(c, 8);  /* number of stored macroblock rows */
      60           5 :         cols = vp56_rac_gets(c, 8);  /* number of stored macroblock cols */
      61           5 :         if (!rows || !cols) {
      62           0 :             av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
      63             :                    cols << 4, rows << 4);
      64           0 :             return AVERROR_INVALIDDATA;
      65             :         }
      66           5 :         vp56_rac_gets(c, 8);  /* number of displayed macroblock rows */
      67           5 :         vp56_rac_gets(c, 8);  /* number of displayed macroblock cols */
      68           5 :         vp56_rac_gets(c, 2);
      69           9 :         if (!s->macroblocks || /* first frame */
      70           8 :             16*cols != s->avctx->coded_width ||
      71           4 :             16*rows != s->avctx->coded_height) {
      72           1 :             int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
      73           1 :             if (ret < 0)
      74           0 :                 return ret;
      75           1 :             return VP56_SIZE_CHANGE;
      76             :         }
      77         242 :     } else if (!s->macroblocks)
      78           0 :         return AVERROR_INVALIDDATA;
      79         246 :     return 0;
      80             : }
      81             : 
      82       10107 : static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
      83             : {
      84       10107 :     VP56RangeCoder *c = &s->c;
      85       10107 :     VP56Model *model = s->modelp;
      86             :     int comp, di;
      87             : 
      88       30321 :     for (comp=0; comp<2; comp++) {
      89       20214 :         int delta = 0;
      90       20214 :         if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
      91       16164 :             int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
      92       16164 :             di  = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
      93       16164 :             di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
      94       16164 :             delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
      95       16164 :                                       model->vector_pdv[comp]);
      96       16164 :             delta = di | (delta << 2);
      97       16164 :             delta = (delta ^ -sign) + sign;
      98             :         }
      99       20214 :         if (!comp)
     100       10107 :             vect->x = delta;
     101             :         else
     102       10107 :             vect->y = delta;
     103             :     }
     104       10107 : }
     105             : 
     106         242 : static void vp5_parse_vector_models(VP56Context *s)
     107             : {
     108         242 :     VP56RangeCoder *c = &s->c;
     109         242 :     VP56Model *model = s->modelp;
     110             :     int comp, node;
     111             : 
     112         726 :     for (comp=0; comp<2; comp++) {
     113         484 :         if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0]))
     114           5 :             model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
     115         484 :         if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1]))
     116          11 :             model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
     117         484 :         if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2]))
     118          11 :             model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
     119         484 :         if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3]))
     120           9 :             model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
     121             :     }
     122             : 
     123         726 :     for (comp=0; comp<2; comp++)
     124        3872 :         for (node=0; node<7; node++)
     125        3388 :             if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node]))
     126          16 :                 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
     127         242 : }
     128             : 
     129         247 : static int vp5_parse_coeff_models(VP56Context *s)
     130             : {
     131         247 :     VP56RangeCoder *c = &s->c;
     132         247 :     VP56Model *model = s->modelp;
     133             :     uint8_t def_prob[11];
     134             :     int node, cg, ctx;
     135             :     int ct;    /* code type */
     136             :     int pt;    /* plane type (0 for Y, 1 for U or V) */
     137             : 
     138         247 :     memset(def_prob, 0x80, sizeof(def_prob));
     139             : 
     140         741 :     for (pt=0; pt<2; pt++)
     141        5928 :         for (node=0; node<11; node++)
     142        5434 :             if (vp56_rac_get_prob_branchy(c, vp5_dccv_pct[pt][node])) {
     143         487 :                 def_prob[node] = vp56_rac_gets_nn(c, 7);
     144         487 :                 model->coeff_dccv[pt][node] = def_prob[node];
     145        4947 :             } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
     146          92 :                 model->coeff_dccv[pt][node] = def_prob[node];
     147             :             }
     148             : 
     149         988 :     for (ct=0; ct<3; ct++)
     150        2223 :         for (pt=0; pt<2; pt++)
     151       10374 :             for (cg=0; cg<6; cg++)
     152      106704 :                 for (node=0; node<11; node++)
     153       97812 :                     if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) {
     154        1083 :                         def_prob[node] = vp56_rac_gets_nn(c, 7);
     155        1083 :                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
     156       96729 :                     } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
     157        1877 :                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
     158             :                     }
     159             : 
     160             :     /* coeff_dcct is a linear combination of coeff_dccv */
     161         741 :     for (pt=0; pt<2; pt++)
     162       18278 :         for (ctx=0; ctx<36; ctx++)
     163      106704 :             for (node=0; node<5; node++)
     164       88920 :                 model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp5_dccv_lc[node][ctx][0] + 128) >> 8) + vp5_dccv_lc[node][ctx][1], 1, 254);
     165             : 
     166             :     /* coeff_acct is a linear combination of coeff_ract */
     167         988 :     for (ct=0; ct<3; ct++)
     168        2223 :         for (pt=0; pt<2; pt++)
     169        5928 :             for (cg=0; cg<3; cg++)
     170       31122 :                 for (ctx=0; ctx<6; ctx++)
     171      160056 :                     for (node=0; node<5; node++)
     172      133380 :                         model->coeff_acct[pt][ct][cg][ctx][node] = av_clip(((model->coeff_ract[pt][ct][cg][node] * vp5_ract_lc[ct][cg][node][ctx][0] + 128) >> 8) + vp5_ract_lc[ct][cg][node][ctx][1], 1, 254);
     173         247 :     return 0;
     174             : }
     175             : 
     176      149804 : static int vp5_parse_coeff(VP56Context *s)
     177             : {
     178      149804 :     VP56RangeCoder *c = &s->c;
     179      149804 :     VP56Model *model = s->modelp;
     180      149804 :     uint8_t *permute = s->idct_scantable;
     181             :     uint8_t *model1, *model2;
     182             :     int coeff, sign, coeff_idx;
     183             :     int b, i, cg, idx, ctx, ctx_last;
     184      149804 :     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
     185             : 
     186      149804 :     if (c->end <= c->buffer && c->bits >= 0) {
     187           1 :         av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp5_parse_coeff\n");
     188           1 :         return AVERROR_INVALIDDATA;
     189             :     }
     190             : 
     191     1048621 :     for (b=0; b<6; b++) {
     192      898818 :         int ct = 1;    /* code type */
     193             : 
     194      898818 :         if (b > 3) pt = 1;
     195             : 
     196     1797636 :         ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
     197      898818 :               + s->above_blocks[s->above_block_idx[b]].not_null_dc;
     198      898818 :         model1 = model->coeff_dccv[pt];
     199      898818 :         model2 = model->coeff_dcct[pt][ctx];
     200             : 
     201      898818 :         coeff_idx = 0;
     202             :         for (;;) {
     203     3872650 :             if (vp56_rac_get_prob_branchy(c, model2[0])) {
     204      475790 :                 if (vp56_rac_get_prob_branchy(c, model2[2])) {
     205       66553 :                     if (vp56_rac_get_prob_branchy(c, model2[3])) {
     206        9320 :                         s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
     207        9320 :                         idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
     208        9320 :                         sign = vp56_rac_get(c);
     209        9320 :                         coeff = ff_vp56_coeff_bias[idx+5];
     210       34985 :                         for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
     211       25665 :                             coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
     212             :                     } else {
     213       57233 :                         if (vp56_rac_get_prob_branchy(c, model2[4])) {
     214       13703 :                             coeff = 3 + vp56_rac_get_prob(c, model1[5]);
     215       13703 :                             s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
     216             :                         } else {
     217       43530 :                             coeff = 2;
     218       43530 :                             s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
     219             :                         }
     220       57233 :                         sign = vp56_rac_get(c);
     221             :                     }
     222       66553 :                     ct = 2;
     223             :                 } else {
     224      409237 :                     ct = 1;
     225      409237 :                     s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
     226      409237 :                     sign = vp56_rac_get(c);
     227      409237 :                     coeff = 1;
     228             :                 }
     229      475790 :                 coeff = (coeff ^ -sign) + sign;
     230      475790 :                 if (coeff_idx)
     231      325045 :                     coeff *= s->dequant_ac;
     232      475790 :                 s->block_coeff[b][permute[coeff_idx]] = coeff;
     233             :             } else {
     234     1909944 :                 if (ct && !vp56_rac_get_prob_branchy(c, model2[1]))
     235      898795 :                     break;
     236     1011149 :                 ct = 0;
     237     1011149 :                 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
     238             :             }
     239     1486939 :             coeff_idx++;
     240     1486939 :             if (coeff_idx >= 64)
     241          23 :                 break;
     242             : 
     243     1486916 :             cg = vp5_coeff_groups[coeff_idx];
     244     1486916 :             ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
     245     1486916 :             model1 = model->coeff_ract[pt][ct][cg];
     246     1486916 :             model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
     247             :         }
     248             : 
     249      898818 :         ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
     250      898818 :         s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
     251      898818 :         if (coeff_idx < ctx_last)
     252     1240469 :             for (i=coeff_idx; i<=ctx_last; i++)
     253     1113499 :                 s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
     254      898818 :         s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
     255             :     }
     256      149803 :     return 0;
     257             : }
     258             : 
     259           5 : static void vp5_default_models_init(VP56Context *s)
     260             : {
     261           5 :     VP56Model *model = s->modelp;
     262             :     int i;
     263             : 
     264          15 :     for (i=0; i<2; i++) {
     265          10 :         model->vector_sig[i] = 0x80;
     266          10 :         model->vector_dct[i] = 0x80;
     267          10 :         model->vector_pdi[i][0] = 0x55;
     268          10 :         model->vector_pdi[i][1] = 0x80;
     269             :     }
     270           5 :     memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
     271           5 :     memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
     272           5 : }
     273             : 
     274           2 : static av_cold int vp5_decode_init(AVCodecContext *avctx)
     275             : {
     276           2 :     VP56Context *s = avctx->priv_data;
     277             :     int ret;
     278             : 
     279           2 :     if ((ret = ff_vp56_init(avctx, 1, 0)) < 0)
     280           0 :         return ret;
     281           2 :     ff_vp5dsp_init(&s->vp56dsp);
     282           2 :     s->vp56_coord_div = vp5_coord_div;
     283           2 :     s->parse_vector_adjustment = vp5_parse_vector_adjustment;
     284           2 :     s->parse_coeff = vp5_parse_coeff;
     285           2 :     s->default_models_init = vp5_default_models_init;
     286           2 :     s->parse_vector_models = vp5_parse_vector_models;
     287           2 :     s->parse_coeff_models = vp5_parse_coeff_models;
     288           2 :     s->parse_header = vp5_parse_header;
     289             : 
     290           2 :     return 0;
     291             : }
     292             : 
     293             : AVCodec ff_vp5_decoder = {
     294             :     .name           = "vp5",
     295             :     .long_name      = NULL_IF_CONFIG_SMALL("On2 VP5"),
     296             :     .type           = AVMEDIA_TYPE_VIDEO,
     297             :     .id             = AV_CODEC_ID_VP5,
     298             :     .priv_data_size = sizeof(VP56Context),
     299             :     .init           = vp5_decode_init,
     300             :     .close          = ff_vp56_free,
     301             :     .decode         = ff_vp56_decode_frame,
     302             :     .capabilities   = AV_CODEC_CAP_DR1,
     303             : };

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