LCOV - code coverage report
Current view: top level - libavcodec - rv10.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 244 367 66.5 %
Date: 2017-12-14 08:27:08 Functions: 7 8 87.5 %

          Line data    Source code
       1             : /*
       2             :  * RV10/RV20 decoder
       3             :  * Copyright (c) 2000,2001 Fabrice Bellard
       4             :  * Copyright (c) 2002-2004 Michael Niedermayer
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : /**
      24             :  * @file
      25             :  * RV10/RV20 decoder
      26             :  */
      27             : 
      28             : #include <inttypes.h>
      29             : 
      30             : #include "libavutil/imgutils.h"
      31             : 
      32             : #include "avcodec.h"
      33             : #include "error_resilience.h"
      34             : #include "h263.h"
      35             : #include "h263data.h"
      36             : #include "internal.h"
      37             : #include "mpeg_er.h"
      38             : #include "mpegutils.h"
      39             : #include "mpegvideo.h"
      40             : #include "mpeg4video.h"
      41             : #include "mpegvideodata.h"
      42             : #include "rv10.h"
      43             : 
      44             : #define RV_GET_MAJOR_VER(x)  ((x) >> 28)
      45             : #define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)
      46             : #define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)
      47             : 
      48             : #define DC_VLC_BITS 14 // FIXME find a better solution
      49             : 
      50             : typedef struct RVDecContext {
      51             :     MpegEncContext m;
      52             :     int sub_id;
      53             :     int orig_width, orig_height;
      54             : } RVDecContext;
      55             : 
      56             : static const uint16_t rv_lum_code[256] = {
      57             :     0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,
      58             :     0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,
      59             :     0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,
      60             :     0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,
      61             :     0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,
      62             :     0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,
      63             :     0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,
      64             :     0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,
      65             :     0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,
      66             :     0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,
      67             :     0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,
      68             :     0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,
      69             :     0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,
      70             :     0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,
      71             :     0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,
      72             :     0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,
      73             :     0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,
      74             :     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
      75             :     0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
      76             :     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
      77             :     0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,
      78             :     0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,
      79             :     0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,
      80             :     0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,
      81             :     0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,
      82             :     0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,
      83             :     0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,
      84             :     0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,
      85             :     0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,
      86             :     0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,
      87             :     0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,
      88             :     0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,
      89             : };
      90             : 
      91             : static const uint8_t rv_lum_bits[256] = {
      92             :     14, 12, 12, 12, 12, 12, 12, 12,
      93             :     12, 12, 12, 12, 12, 12, 12, 12,
      94             :     12, 12, 12, 12, 12, 12, 12, 12,
      95             :     12, 12, 12, 12, 12, 12, 12, 12,
      96             :     12, 12, 12, 12, 12, 12, 12, 12,
      97             :     12, 12, 12, 12, 12, 12, 12, 12,
      98             :     12, 12, 12, 12, 12, 12, 12, 12,
      99             :     12, 12, 12, 12, 12, 12, 12, 12,
     100             :     12, 10, 10, 10, 10, 10, 10, 10,
     101             :     10, 10, 10, 10, 10, 10, 10, 10,
     102             :     10, 10, 10, 10, 10, 10, 10, 10,
     103             :     10, 10, 10, 10, 10, 10, 10, 10,
     104             :     10,  8,  8,  8,  8,  8,  8,  8,
     105             :      8,  8,  8,  8,  8,  8,  8,  8,
     106             :      8,  7,  7,  7,  7,  7,  7,  7,
     107             :      7,  6,  6,  6,  6,  5,  5,  4,
     108             :      2,  4,  5,  5,  6,  6,  6,  6,
     109             :      7,  7,  7,  7,  7,  7,  7,  7,
     110             :      8,  8,  8,  8,  8,  8,  8,  8,
     111             :      8,  8,  8,  8,  8,  8,  8,  8,
     112             :     10, 10, 10, 10, 10, 10, 10, 10,
     113             :     10, 10, 10, 10, 10, 10, 10, 10,
     114             :     10, 10, 10, 10, 10, 10, 10, 10,
     115             :     10, 10, 10, 10, 10, 10, 10, 10,
     116             :     12, 12, 12, 12, 12, 12, 12, 12,
     117             :     12, 12, 12, 12, 12, 12, 12, 12,
     118             :     12, 12, 12, 12, 12, 12, 12, 12,
     119             :     12, 12, 12, 12, 12, 12, 12, 12,
     120             :     12, 12, 12, 12, 12, 12, 12, 12,
     121             :     12, 12, 12, 12, 12, 12, 12, 12,
     122             :     12, 12, 12, 12, 12, 12, 12, 12,
     123             :     12, 12, 12, 12, 12, 12, 12, 12,
     124             : };
     125             : 
     126             : static const uint16_t rv_chrom_code[256] = {
     127             :     0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,
     128             :     0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,
     129             :     0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,
     130             :     0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,
     131             :     0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,
     132             :     0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,
     133             :     0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,
     134             :     0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,
     135             :     0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,
     136             :     0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,
     137             :     0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,
     138             :     0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,
     139             :     0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,
     140             :     0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,
     141             :     0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,
     142             :     0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,
     143             :     0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,
     144             :     0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
     145             :     0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,
     146             :     0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,
     147             :     0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,
     148             :     0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,
     149             :     0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,
     150             :     0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,
     151             :     0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,
     152             :     0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,
     153             :     0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,
     154             :     0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,
     155             :     0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,
     156             :     0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,
     157             :     0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,
     158             :     0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,
     159             : };
     160             : 
     161             : static const uint8_t rv_chrom_bits[256] = {
     162             :     16, 14, 14, 14, 14, 14, 14, 14,
     163             :     14, 14, 14, 14, 14, 14, 14, 14,
     164             :     14, 14, 14, 14, 14, 14, 14, 14,
     165             :     14, 14, 14, 14, 14, 14, 14, 14,
     166             :     14, 14, 14, 14, 14, 14, 14, 14,
     167             :     14, 14, 14, 14, 14, 14, 14, 14,
     168             :     14, 14, 14, 14, 14, 14, 14, 14,
     169             :     14, 14, 14, 14, 14, 14, 14, 14,
     170             :     14, 12, 12, 12, 12, 12, 12, 12,
     171             :     12, 12, 12, 12, 12, 12, 12, 12,
     172             :     12, 12, 12, 12, 12, 12, 12, 12,
     173             :     12, 12, 12, 12, 12, 12, 12, 12,
     174             :     12, 10, 10, 10, 10, 10, 10, 10,
     175             :     10, 10, 10, 10, 10, 10, 10, 10,
     176             :     10,  8,  8,  8,  8,  8,  8,  8,
     177             :      8,  6,  6,  6,  6,  4,  4,  3,
     178             :      2,  3,  4,  4,  6,  6,  6,  6,
     179             :      8,  8,  8,  8,  8,  8,  8,  8,
     180             :     10, 10, 10, 10, 10, 10, 10, 10,
     181             :     10, 10, 10, 10, 10, 10, 10, 10,
     182             :     12, 12, 12, 12, 12, 12, 12, 12,
     183             :     12, 12, 12, 12, 12, 12, 12, 12,
     184             :     12, 12, 12, 12, 12, 12, 12, 12,
     185             :     12, 12, 12, 12, 12, 12, 12, 12,
     186             :     14, 14, 14, 14, 14, 14, 14, 14,
     187             :     14, 14, 14, 14, 14, 14, 14, 14,
     188             :     14, 14, 14, 14, 14, 14, 14, 14,
     189             :     14, 14, 14, 14, 14, 14, 14, 14,
     190             :     14, 14, 14, 14, 14, 14, 14, 14,
     191             :     14, 14, 14, 14, 14, 14, 14, 14,
     192             :     14, 14, 14, 14, 14, 14, 14, 14,
     193             :     14, 14, 14, 14, 14, 14, 14, 14,
     194             : };
     195             : 
     196             : static VLC rv_dc_lum, rv_dc_chrom;
     197             : 
     198           0 : int ff_rv_decode_dc(MpegEncContext *s, int n)
     199             : {
     200             :     int code;
     201             : 
     202           0 :     if (n < 4) {
     203           0 :         code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);
     204           0 :         if (code < 0) {
     205             :             /* XXX: I don't understand why they use LONGER codes than
     206             :              * necessary. The following code would be completely useless
     207             :              * if they had thought about it !!! */
     208           0 :             code = get_bits(&s->gb, 7);
     209           0 :             if (code == 0x7c) {
     210           0 :                 code = (int8_t) (get_bits(&s->gb, 7) + 1);
     211           0 :             } else if (code == 0x7d) {
     212           0 :                 code = -128 + get_bits(&s->gb, 7);
     213           0 :             } else if (code == 0x7e) {
     214           0 :                 if (get_bits1(&s->gb) == 0)
     215           0 :                     code = (int8_t) (get_bits(&s->gb, 8) + 1);
     216             :                 else
     217           0 :                     code = (int8_t) (get_bits(&s->gb, 8));
     218           0 :             } else if (code == 0x7f) {
     219           0 :                 skip_bits(&s->gb, 11);
     220           0 :                 code = 1;
     221             :             }
     222             :         } else {
     223           0 :             code -= 128;
     224             :         }
     225             :     } else {
     226           0 :         code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);
     227             :         /* same remark */
     228           0 :         if (code < 0) {
     229           0 :             code = get_bits(&s->gb, 9);
     230           0 :             if (code == 0x1fc) {
     231           0 :                 code = (int8_t) (get_bits(&s->gb, 7) + 1);
     232           0 :             } else if (code == 0x1fd) {
     233           0 :                 code = -128 + get_bits(&s->gb, 7);
     234           0 :             } else if (code == 0x1fe) {
     235           0 :                 skip_bits(&s->gb, 9);
     236           0 :                 code = 1;
     237             :             } else {
     238           0 :                 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");
     239           0 :                 return 0xffff;
     240             :             }
     241             :         } else {
     242           0 :             code -= 128;
     243             :         }
     244             :     }
     245           0 :     return -code;
     246             : }
     247             : 
     248             : /* read RV 1.0 compatible frame header */
     249         150 : static int rv10_decode_picture_header(MpegEncContext *s)
     250             : {
     251             :     int mb_count, pb_frame, marker, mb_xy;
     252             : 
     253         150 :     marker = get_bits1(&s->gb);
     254             : 
     255         150 :     if (get_bits1(&s->gb))
     256         135 :         s->pict_type = AV_PICTURE_TYPE_P;
     257             :     else
     258          15 :         s->pict_type = AV_PICTURE_TYPE_I;
     259             : 
     260         150 :     if (!marker)
     261           0 :         av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
     262             : 
     263         150 :     pb_frame = get_bits1(&s->gb);
     264             : 
     265             :     ff_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);
     266             : 
     267         150 :     if (pb_frame) {
     268           0 :         avpriv_request_sample(s->avctx, "PB-frame");
     269           0 :         return AVERROR_PATCHWELCOME;
     270             :     }
     271             : 
     272         150 :     s->qscale = get_bits(&s->gb, 5);
     273         150 :     if (s->qscale == 0) {
     274           0 :         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
     275           0 :         return AVERROR_INVALIDDATA;
     276             :     }
     277             : 
     278         150 :     if (s->pict_type == AV_PICTURE_TYPE_I) {
     279          15 :         if (s->rv10_version == 3) {
     280             :             /* specific MPEG like DC coding not used */
     281           0 :             s->last_dc[0] = get_bits(&s->gb, 8);
     282           0 :             s->last_dc[1] = get_bits(&s->gb, 8);
     283           0 :             s->last_dc[2] = get_bits(&s->gb, 8);
     284             :             ff_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],
     285             :                     s->last_dc[1], s->last_dc[2]);
     286             :         }
     287             :     }
     288             :     /* if multiple packets per frame are sent, the position at which
     289             :      * to display the macroblocks is coded here */
     290             : 
     291         150 :     mb_xy = s->mb_x + s->mb_y * s->mb_width;
     292         150 :     if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {
     293         150 :         s->mb_x  = get_bits(&s->gb, 6); /* mb_x */
     294         150 :         s->mb_y  = get_bits(&s->gb, 6); /* mb_y */
     295         150 :         mb_count = get_bits(&s->gb, 12);
     296             :     } else {
     297           0 :         s->mb_x  = 0;
     298           0 :         s->mb_y  = 0;
     299           0 :         mb_count = s->mb_width * s->mb_height;
     300             :     }
     301         150 :     skip_bits(&s->gb, 3);   /* ignored */
     302         150 :     s->f_code          = 1;
     303         150 :     s->unrestricted_mv = 1;
     304             : 
     305         150 :     return mb_count;
     306             : }
     307             : 
     308         742 : static int rv20_decode_picture_header(RVDecContext *rv)
     309             : {
     310         742 :     MpegEncContext *s = &rv->m;
     311             :     int seq, mb_pos, i, ret;
     312             :     int rpr_max;
     313             : 
     314         742 :     i = get_bits(&s->gb, 2);
     315         742 :     switch (i) {
     316          52 :     case 0:
     317          52 :         s->pict_type = AV_PICTURE_TYPE_I;
     318          52 :         break;
     319          15 :     case 1:
     320          15 :         s->pict_type = AV_PICTURE_TYPE_I;
     321          15 :         break;                                  // hmm ...
     322         494 :     case 2:
     323         494 :         s->pict_type = AV_PICTURE_TYPE_P;
     324         494 :         break;
     325         181 :     case 3:
     326         181 :         s->pict_type = AV_PICTURE_TYPE_B;
     327         181 :         break;
     328           0 :     default:
     329           0 :         av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n");
     330           0 :         return AVERROR_INVALIDDATA;
     331             :     }
     332             : 
     333         742 :     if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {
     334           0 :         av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
     335           0 :         return -1;
     336             :     }
     337         742 :     if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {
     338           0 :         av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
     339           0 :         return AVERROR_INVALIDDATA;
     340             :     }
     341             : 
     342         742 :     if (get_bits1(&s->gb)) {
     343           0 :         av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");
     344           0 :         return AVERROR_INVALIDDATA;
     345             :     }
     346             : 
     347         742 :     s->qscale = get_bits(&s->gb, 5);
     348         742 :     if (s->qscale == 0) {
     349           0 :         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
     350           0 :         return AVERROR_INVALIDDATA;
     351             :     }
     352             : 
     353         742 :     if (RV_GET_MINOR_VER(rv->sub_id) >= 2)
     354         592 :         s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;
     355             : 
     356         742 :     if (RV_GET_MINOR_VER(rv->sub_id) <= 1)
     357         150 :         seq = get_bits(&s->gb, 8) << 7;
     358             :     else
     359         592 :         seq = get_bits(&s->gb, 13) << 2;
     360             : 
     361         742 :     rpr_max = s->avctx->extradata[1] & 7;
     362         742 :     if (rpr_max) {
     363             :         int f, new_w, new_h;
     364         592 :         int rpr_bits = av_log2(rpr_max) + 1;
     365             : 
     366         592 :         f = get_bits(&s->gb, rpr_bits);
     367             : 
     368         592 :         if (f) {
     369           0 :             if (s->avctx->extradata_size < 8 + 2 * f) {
     370           0 :                 av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
     371           0 :                 return AVERROR_INVALIDDATA;
     372             :             }
     373             : 
     374           0 :             new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f];
     375           0 :             new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f];
     376             :         } else {
     377         592 :             new_w = rv->orig_width;
     378         592 :             new_h = rv->orig_height;
     379             :         }
     380         592 :         if (new_w != s->width || new_h != s->height) {
     381           0 :             AVRational old_aspect = s->avctx->sample_aspect_ratio;
     382           0 :             av_log(s->avctx, AV_LOG_DEBUG,
     383             :                    "attempting to change resolution to %dx%d\n", new_w, new_h);
     384           0 :             if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
     385           0 :                 return AVERROR_INVALIDDATA;
     386           0 :             ff_mpv_common_end(s);
     387             : 
     388             :             // attempt to keep aspect during typical resolution switches
     389           0 :             if (!old_aspect.num)
     390           0 :                 old_aspect = (AVRational){1, 1};
     391           0 :             if (2 * new_w * s->height == new_h * s->width)
     392           0 :                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
     393           0 :             if (new_w * s->height == 2 * new_h * s->width)
     394           0 :                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});
     395             : 
     396           0 :             ret = ff_set_dimensions(s->avctx, new_w, new_h);
     397           0 :             if (ret < 0)
     398           0 :                 return ret;
     399             : 
     400           0 :             s->width  = new_w;
     401           0 :             s->height = new_h;
     402           0 :             if ((ret = ff_mpv_common_init(s)) < 0)
     403           0 :                 return ret;
     404             :         }
     405             : 
     406         592 :         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
     407           0 :             av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max);
     408             :         }
     409             :     }
     410         742 :     if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)
     411           0 :         return AVERROR_INVALIDDATA;
     412             : 
     413         742 :     mb_pos = ff_h263_decode_mba(s);
     414             : 
     415         742 :     seq |= s->time & ~0x7FFF;
     416         742 :     if (seq - s->time >  0x4000)
     417           0 :         seq -= 0x8000;
     418         742 :     if (seq - s->time < -0x4000)
     419           0 :         seq += 0x8000;
     420             : 
     421         742 :     if (seq != s->time) {
     422         292 :         if (s->pict_type != AV_PICTURE_TYPE_B) {
     423         220 :             s->time            = seq;
     424         220 :             s->pp_time         = s->time - s->last_non_b_time;
     425         220 :             s->last_non_b_time = s->time;
     426             :         } else {
     427          72 :             s->time    = seq;
     428          72 :             s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
     429             :         }
     430             :     }
     431         742 :     if (s->pict_type == AV_PICTURE_TYPE_B) {
     432         181 :         if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {
     433           0 :             av_log(s->avctx, AV_LOG_DEBUG,
     434             :                    "messed up order, possible from seeking? skipping current B-frame\n");
     435             : #define ERROR_SKIP_FRAME -123
     436           0 :             return ERROR_SKIP_FRAME;
     437             :         }
     438         181 :         ff_mpeg4_init_direct_mv(s);
     439             :     }
     440             : 
     441         742 :     s->no_rounding = get_bits1(&s->gb);
     442             : 
     443         742 :     if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)
     444             :         // binary decoder reads 3+2 bits here but they don't seem to be used
     445           0 :         skip_bits(&s->gb, 5);
     446             : 
     447         742 :     s->f_code          = 1;
     448         742 :     s->unrestricted_mv = 1;
     449         742 :     s->h263_aic        = s->pict_type == AV_PICTURE_TYPE_I;
     450         742 :     s->modified_quant  = 1;
     451         742 :     if (!s->avctx->lowres)
     452         150 :         s->loop_filter = 1;
     453             : 
     454         742 :     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
     455           0 :         av_log(s->avctx, AV_LOG_INFO,
     456             :                "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
     457             :                seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,
     458             :                s->no_rounding);
     459             :     }
     460             : 
     461         742 :     av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);
     462             : 
     463         742 :     return s->mb_width * s->mb_height - mb_pos;
     464             : }
     465             : 
     466          20 : static av_cold int rv10_decode_init(AVCodecContext *avctx)
     467             : {
     468          20 :     RVDecContext *rv = avctx->priv_data;
     469          20 :     MpegEncContext *s = &rv->m;
     470             :     static int done = 0;
     471             :     int major_ver, minor_ver, micro_ver, ret;
     472             : 
     473          20 :     if (avctx->extradata_size < 8) {
     474           0 :         av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
     475           0 :         return AVERROR_INVALIDDATA;
     476             :     }
     477          20 :     if ((ret = av_image_check_size(avctx->coded_width,
     478          20 :                                    avctx->coded_height, 0, avctx)) < 0)
     479           0 :         return ret;
     480             : 
     481          20 :     ff_mpv_decode_defaults(s);
     482          20 :     ff_mpv_decode_init(s, avctx);
     483             : 
     484          20 :     s->out_format  = FMT_H263;
     485             : 
     486          20 :     rv->orig_width  =
     487          20 :     s->width        = avctx->coded_width;
     488          20 :     rv->orig_height =
     489          20 :     s->height       = avctx->coded_height;
     490             : 
     491          20 :     s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1;
     492          20 :     rv->sub_id           = AV_RB32((uint8_t *) avctx->extradata + 4);
     493             : 
     494          20 :     major_ver = RV_GET_MAJOR_VER(rv->sub_id);
     495          20 :     minor_ver = RV_GET_MINOR_VER(rv->sub_id);
     496          20 :     micro_ver = RV_GET_MICRO_VER(rv->sub_id);
     497             : 
     498          20 :     s->low_delay = 1;
     499          20 :     switch (major_ver) {
     500           9 :     case 1:
     501           9 :         s->rv10_version = micro_ver ? 3 : 1;
     502           9 :         s->obmc         = micro_ver == 2;
     503           9 :         break;
     504          11 :     case 2:
     505          11 :         if (minor_ver >= 2) {
     506           3 :             s->low_delay           = 0;
     507           3 :             s->avctx->has_b_frames = 1;
     508             :         }
     509          11 :         break;
     510           0 :     default:
     511           0 :         av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);
     512           0 :         avpriv_request_sample(avctx, "RV1/2 version");
     513           0 :         return AVERROR_PATCHWELCOME;
     514             :     }
     515             : 
     516          20 :     if (avctx->debug & FF_DEBUG_PICT_INFO) {
     517           0 :         av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id,
     518           0 :                ((uint32_t *) avctx->extradata)[0]);
     519             :     }
     520             : 
     521          20 :     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
     522             : 
     523          20 :     ff_mpv_idct_init(s);
     524          20 :     if ((ret = ff_mpv_common_init(s)) < 0)
     525           0 :         return ret;
     526             : 
     527          20 :     ff_h263dsp_init(&s->h263dsp);
     528          20 :     ff_h263_decode_init_vlc();
     529             : 
     530             :     /* init rv vlc */
     531          20 :     if (!done) {
     532          13 :         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,
     533             :                         rv_lum_bits, 1, 1,
     534             :                         rv_lum_code, 2, 2, 16384);
     535          13 :         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,
     536             :                         rv_chrom_bits, 1, 1,
     537             :                         rv_chrom_code, 2, 2, 16388);
     538          13 :         done = 1;
     539             :     }
     540             : 
     541          20 :     return 0;
     542             : }
     543             : 
     544          20 : static av_cold int rv10_decode_end(AVCodecContext *avctx)
     545             : {
     546          20 :     MpegEncContext *s = avctx->priv_data;
     547             : 
     548          20 :     ff_mpv_common_end(s);
     549          20 :     return 0;
     550             : }
     551             : 
     552         892 : static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
     553             :                               int buf_size, int buf_size2)
     554             : {
     555         892 :     RVDecContext *rv = avctx->priv_data;
     556         892 :     MpegEncContext *s = &rv->m;
     557             :     int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;
     558             : 
     559         892 :     active_bits_size = buf_size * 8;
     560         892 :     init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);
     561         892 :     if (s->codec_id == AV_CODEC_ID_RV10)
     562         150 :         mb_count = rv10_decode_picture_header(s);
     563             :     else
     564         742 :         mb_count = rv20_decode_picture_header(rv);
     565         892 :     if (mb_count < 0) {
     566           0 :         if (mb_count != ERROR_SKIP_FRAME)
     567           0 :             av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
     568           0 :         return AVERROR_INVALIDDATA;
     569             :     }
     570             : 
     571        1784 :     if (s->mb_x >= s->mb_width ||
     572         892 :         s->mb_y >= s->mb_height) {
     573           0 :         av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
     574           0 :         return AVERROR_INVALIDDATA;
     575             :     }
     576         892 :     mb_pos = s->mb_y * s->mb_width + s->mb_x;
     577         892 :     left   = s->mb_width * s->mb_height - mb_pos;
     578         892 :     if (mb_count > left) {
     579           0 :         av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
     580           0 :         return AVERROR_INVALIDDATA;
     581             :     }
     582             : 
     583         892 :     if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {
     584             :         // FIXME write parser so we always have complete frames?
     585         445 :         if (s->current_picture_ptr) {
     586           0 :             ff_er_frame_end(&s->er);
     587           0 :             ff_mpv_frame_end(s);
     588           0 :             s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
     589             :         }
     590         445 :         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
     591           0 :             return ret;
     592         445 :         ff_mpeg_er_frame_start(s);
     593             :     } else {
     594         447 :         if (s->current_picture_ptr->f->pict_type != s->pict_type) {
     595           0 :             av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
     596           0 :             return AVERROR_INVALIDDATA;
     597             :         }
     598             :     }
     599             : 
     600             : 
     601             :     ff_dlog(avctx, "qscale=%d\n", s->qscale);
     602             : 
     603             :     /* default quantization values */
     604         892 :     if (s->codec_id == AV_CODEC_ID_RV10) {
     605         150 :         if (s->mb_y == 0)
     606         150 :             s->first_slice_line = 1;
     607             :     } else {
     608         742 :         s->first_slice_line = 1;
     609         742 :         s->resync_mb_x      = s->mb_x;
     610             :     }
     611         892 :     start_mb_x     = s->mb_x;
     612         892 :     s->resync_mb_y = s->mb_y;
     613         892 :     if (s->h263_aic) {
     614          67 :         s->y_dc_scale_table =
     615          67 :         s->c_dc_scale_table = ff_aic_dc_scale_table;
     616             :     } else {
     617         825 :         s->y_dc_scale_table =
     618         825 :         s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
     619             :     }
     620             : 
     621         892 :     if (s->modified_quant)
     622         742 :         s->chroma_qscale_table = ff_h263_chroma_qscale_table;
     623             : 
     624         892 :     ff_set_qscale(s, s->qscale);
     625             : 
     626         892 :     s->rv10_first_dc_coded[0] = 0;
     627         892 :     s->rv10_first_dc_coded[1] = 0;
     628         892 :     s->rv10_first_dc_coded[2] = 0;
     629         892 :     s->block_wrap[0] =
     630         892 :     s->block_wrap[1] =
     631         892 :     s->block_wrap[2] =
     632         892 :     s->block_wrap[3] = s->b8_stride;
     633         892 :     s->block_wrap[4] =
     634         892 :     s->block_wrap[5] = s->mb_stride;
     635         892 :     ff_init_block_index(s);
     636             : 
     637             :     /* decode each macroblock */
     638      162300 :     for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {
     639             :         int ret;
     640      162300 :         ff_update_block_index(s);
     641             :         ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
     642             : 
     643      162300 :         s->mv_dir  = MV_DIR_FORWARD;
     644      162300 :         s->mv_type = MV_TYPE_16X16;
     645      162300 :         ret = ff_h263_decode_mb(s, s->block);
     646             : 
     647             :         // Repeat the slice end check from ff_h263_decode_mb with our active
     648             :         // bitstream size
     649      162300 :         if (ret != SLICE_ERROR) {
     650      162300 :             int v = show_bits(&s->gb, 16);
     651             : 
     652      162300 :             if (get_bits_count(&s->gb) + 16 > active_bits_size)
     653        1341 :                 v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
     654             : 
     655      162300 :             if (!v)
     656         892 :                 ret = SLICE_END;
     657             :         }
     658      162300 :         if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
     659           0 :             8 * buf_size2 >= get_bits_count(&s->gb)) {
     660           0 :             active_bits_size = buf_size2 * 8;
     661           0 :             av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
     662             :                    8 * buf_size, active_bits_size);
     663           0 :             ret = SLICE_OK;
     664             :         }
     665             : 
     666      162300 :         if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {
     667           0 :             av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,
     668             :                    s->mb_y);
     669           0 :             return AVERROR_INVALIDDATA;
     670             :         }
     671      162300 :         if (s->pict_type != AV_PICTURE_TYPE_B)
     672      140700 :             ff_h263_update_motion_val(s);
     673      162300 :         ff_mpv_reconstruct_mb(s, s->block);
     674      162300 :         if (s->loop_filter)
     675       59400 :             ff_h263_loop_filter(s);
     676             : 
     677      162300 :         if (++s->mb_x == s->mb_width) {
     678        7575 :             s->mb_x = 0;
     679        7575 :             s->mb_y++;
     680        7575 :             ff_init_block_index(s);
     681             :         }
     682      162300 :         if (s->mb_x == s->resync_mb_x)
     683        7297 :             s->first_slice_line = 0;
     684      162300 :         if (ret == SLICE_END)
     685         892 :             break;
     686             :     }
     687             : 
     688         892 :     ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,
     689             :                     ER_MB_END);
     690             : 
     691         892 :     return active_bits_size;
     692             : }
     693             : 
     694        1667 : static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
     695             : {
     696        1667 :     if (avctx->slice_count)
     697           0 :         return avctx->slice_offset[n];
     698             :     else
     699        1667 :         return AV_RL32(buf + n * 8);
     700             : }
     701             : 
     702         449 : static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     703             :                              AVPacket *avpkt)
     704             : {
     705         449 :     const uint8_t *buf = avpkt->data;
     706         449 :     int buf_size       = avpkt->size;
     707         449 :     MpegEncContext *s = avctx->priv_data;
     708         449 :     AVFrame *pict = data;
     709             :     int i, ret;
     710             :     int slice_count;
     711         449 :     const uint8_t *slices_hdr = NULL;
     712             : 
     713             :     ff_dlog(avctx, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
     714             : 
     715             :     /* no supplementary picture */
     716         449 :     if (buf_size == 0) {
     717           4 :         return 0;
     718             :     }
     719             : 
     720         445 :     if (!avctx->slice_count) {
     721         445 :         slice_count = (*buf++) + 1;
     722         445 :         buf_size--;
     723             : 
     724         445 :         if (!slice_count || buf_size <= 8 * slice_count) {
     725           0 :             av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",
     726             :                    slice_count);
     727           0 :             return AVERROR_INVALIDDATA;
     728             :         }
     729             : 
     730         445 :         slices_hdr = buf + 4;
     731         445 :         buf       += 8 * slice_count;
     732         445 :         buf_size  -= 8 * slice_count;
     733             :     } else
     734           0 :         slice_count = avctx->slice_count;
     735             : 
     736        1337 :     for (i = 0; i < slice_count; i++) {
     737         892 :         unsigned offset = get_slice_offset(avctx, slices_hdr, i);
     738             :         int size, size2;
     739             : 
     740         892 :         if (offset >= buf_size)
     741           0 :             return AVERROR_INVALIDDATA;
     742             : 
     743         892 :         if (i + 1 == slice_count)
     744         445 :             size = buf_size - offset;
     745             :         else
     746         447 :             size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;
     747             : 
     748         892 :         if (i + 2 >= slice_count)
     749         564 :             size2 = buf_size - offset;
     750             :         else
     751         328 :             size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;
     752             : 
     753        1784 :         if (size <= 0 || size2 <= 0 ||
     754         892 :             offset + FFMAX(size, size2) > buf_size)
     755           0 :             return AVERROR_INVALIDDATA;
     756             : 
     757         892 :         if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2)) < 0)
     758           0 :             return ret;
     759             : 
     760         892 :         if (ret > 8 * size)
     761           0 :             i++;
     762             :     }
     763             : 
     764         445 :     if (s->current_picture_ptr && s->mb_y >= s->mb_height) {
     765         445 :         ff_er_frame_end(&s->er);
     766         445 :         ff_mpv_frame_end(s);
     767             : 
     768         445 :         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
     769         372 :             if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
     770           0 :                 return ret;
     771         372 :             ff_print_debug_info(s, s->current_picture_ptr, pict);
     772         372 :             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
     773          73 :         } else if (s->last_picture_ptr) {
     774          72 :             if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
     775           0 :                 return ret;
     776          72 :             ff_print_debug_info(s, s->last_picture_ptr, pict);
     777          72 :             ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
     778             :         }
     779             : 
     780         445 :         if (s->last_picture_ptr || s->low_delay) {
     781         444 :             *got_frame = 1;
     782             :         }
     783             : 
     784             :         // so we can detect if frame_end was not called (find some nicer solution...)
     785         445 :         s->current_picture_ptr = NULL;
     786             :     }
     787             : 
     788         445 :     return avpkt->size;
     789             : }
     790             : 
     791             : AVCodec ff_rv10_decoder = {
     792             :     .name           = "rv10",
     793             :     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),
     794             :     .type           = AVMEDIA_TYPE_VIDEO,
     795             :     .id             = AV_CODEC_ID_RV10,
     796             :     .priv_data_size = sizeof(RVDecContext),
     797             :     .init           = rv10_decode_init,
     798             :     .close          = rv10_decode_end,
     799             :     .decode         = rv10_decode_frame,
     800             :     .capabilities   = AV_CODEC_CAP_DR1,
     801             :     .max_lowres     = 3,
     802             :     .pix_fmts       = (const enum AVPixelFormat[]) {
     803             :         AV_PIX_FMT_YUV420P,
     804             :         AV_PIX_FMT_NONE
     805             :     },
     806             : };
     807             : 
     808             : AVCodec ff_rv20_decoder = {
     809             :     .name           = "rv20",
     810             :     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 2.0"),
     811             :     .type           = AVMEDIA_TYPE_VIDEO,
     812             :     .id             = AV_CODEC_ID_RV20,
     813             :     .priv_data_size = sizeof(RVDecContext),
     814             :     .init           = rv10_decode_init,
     815             :     .close          = rv10_decode_end,
     816             :     .decode         = rv10_decode_frame,
     817             :     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
     818             :     .flush          = ff_mpeg_flush,
     819             :     .max_lowres     = 3,
     820             :     .pix_fmts       = (const enum AVPixelFormat[]) {
     821             :         AV_PIX_FMT_YUV420P,
     822             :         AV_PIX_FMT_NONE
     823             :     },
     824             : };

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