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  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. int ff_rv_decode_dc(MpegEncContext *s, int n)
  199. {
  200.     int code;
  201.  
  202.     if (n < 4) {
  203.         code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);
  204.         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.             code = get_bits(&s->gb, 7);
  209.             if (code == 0x7c) {
  210.                 code = (int8_t) (get_bits(&s->gb, 7) + 1);
  211.             } else if (code == 0x7d) {
  212.                 code = -128 + get_bits(&s->gb, 7);
  213.             } else if (code == 0x7e) {
  214.                 if (get_bits1(&s->gb) == 0)
  215.                     code = (int8_t) (get_bits(&s->gb, 8) + 1);
  216.                 else
  217.                     code = (int8_t) (get_bits(&s->gb, 8));
  218.             } else if (code == 0x7f) {
  219.                 skip_bits(&s->gb, 11);
  220.                 code = 1;
  221.             }
  222.         } else {
  223.             code -= 128;
  224.         }
  225.     } else {
  226.         code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);
  227.         /* same remark */
  228.         if (code < 0) {
  229.             code = get_bits(&s->gb, 9);
  230.             if (code == 0x1fc) {
  231.                 code = (int8_t) (get_bits(&s->gb, 7) + 1);
  232.             } else if (code == 0x1fd) {
  233.                 code = -128 + get_bits(&s->gb, 7);
  234.             } else if (code == 0x1fe) {
  235.                 skip_bits(&s->gb, 9);
  236.                 code = 1;
  237.             } else {
  238.                 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");
  239.                 return 0xffff;
  240.             }
  241.         } else {
  242.             code -= 128;
  243.         }
  244.     }
  245.     return -code;
  246. }
  247.  
  248. /* read RV 1.0 compatible frame header */
  249. static int rv10_decode_picture_header(MpegEncContext *s)
  250. {
  251.     int mb_count, pb_frame, marker, mb_xy;
  252.  
  253.     marker = get_bits1(&s->gb);
  254.  
  255.     if (get_bits1(&s->gb))
  256.         s->pict_type = AV_PICTURE_TYPE_P;
  257.     else
  258.         s->pict_type = AV_PICTURE_TYPE_I;
  259.  
  260.     if (!marker)
  261.         av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
  262.  
  263.     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.     if (pb_frame) {
  268.         avpriv_request_sample(s->avctx, "pb frame");
  269.         return AVERROR_PATCHWELCOME;
  270.     }
  271.  
  272.     s->qscale = get_bits(&s->gb, 5);
  273.     if (s->qscale == 0) {
  274.         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
  275.         return AVERROR_INVALIDDATA;
  276.     }
  277.  
  278.     if (s->pict_type == AV_PICTURE_TYPE_I) {
  279.         if (s->rv10_version == 3) {
  280.             /* specific MPEG like DC coding not used */
  281.             s->last_dc[0] = get_bits(&s->gb, 8);
  282.             s->last_dc[1] = get_bits(&s->gb, 8);
  283.             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.     mb_xy = s->mb_x + s->mb_y * s->mb_width;
  292.     if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {
  293.         s->mb_x  = get_bits(&s->gb, 6); /* mb_x */
  294.         s->mb_y  = get_bits(&s->gb, 6); /* mb_y */
  295.         mb_count = get_bits(&s->gb, 12);
  296.     } else {
  297.         s->mb_x  = 0;
  298.         s->mb_y  = 0;
  299.         mb_count = s->mb_width * s->mb_height;
  300.     }
  301.     skip_bits(&s->gb, 3);   /* ignored */
  302.     s->f_code          = 1;
  303.     s->unrestricted_mv = 1;
  304.  
  305.     return mb_count;
  306. }
  307.  
  308. static int rv20_decode_picture_header(RVDecContext *rv)
  309. {
  310.     MpegEncContext *s = &rv->m;
  311.     int seq, mb_pos, i, ret;
  312.     int rpr_max;
  313.  
  314.     i = get_bits(&s->gb, 2);
  315.     switch (i) {
  316.     case 0:
  317.         s->pict_type = AV_PICTURE_TYPE_I;
  318.         break;
  319.     case 1:
  320.         s->pict_type = AV_PICTURE_TYPE_I;
  321.         break;                                  // hmm ...
  322.     case 2:
  323.         s->pict_type = AV_PICTURE_TYPE_P;
  324.         break;
  325.     case 3:
  326.         s->pict_type = AV_PICTURE_TYPE_B;
  327.         break;
  328.     default:
  329.         av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n");
  330.         return AVERROR_INVALIDDATA;
  331.     }
  332.  
  333.     if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {
  334.         av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
  335.         return -1;
  336.     }
  337.     if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {
  338.         av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
  339.         return AVERROR_INVALIDDATA;
  340.     }
  341.  
  342.     if (get_bits1(&s->gb)) {
  343.         av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");
  344.         return AVERROR_INVALIDDATA;
  345.     }
  346.  
  347.     s->qscale = get_bits(&s->gb, 5);
  348.     if (s->qscale == 0) {
  349.         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
  350.         return AVERROR_INVALIDDATA;
  351.     }
  352.  
  353.     if (RV_GET_MINOR_VER(rv->sub_id) >= 2)
  354.         s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;
  355.  
  356.     if (RV_GET_MINOR_VER(rv->sub_id) <= 1)
  357.         seq = get_bits(&s->gb, 8) << 7;
  358.     else
  359.         seq = get_bits(&s->gb, 13) << 2;
  360.  
  361.     rpr_max = s->avctx->extradata[1] & 7;
  362.     if (rpr_max) {
  363.         int f, new_w, new_h;
  364.         int rpr_bits = av_log2(rpr_max) + 1;
  365.  
  366.         f = get_bits(&s->gb, rpr_bits);
  367.  
  368.         if (f) {
  369.             if (s->avctx->extradata_size < 8 + 2 * f) {
  370.                 av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
  371.                 return AVERROR_INVALIDDATA;
  372.             }
  373.  
  374.             new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f];
  375.             new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f];
  376.         } else {
  377.             new_w = rv->orig_width;
  378.             new_h = rv->orig_height;
  379.         }
  380.         if (new_w != s->width || new_h != s->height) {
  381.             AVRational old_aspect = s->avctx->sample_aspect_ratio;
  382.             av_log(s->avctx, AV_LOG_DEBUG,
  383.                    "attempting to change resolution to %dx%d\n", new_w, new_h);
  384.             if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
  385.                 return AVERROR_INVALIDDATA;
  386.             ff_mpv_common_end(s);
  387.  
  388.             // attempt to keep aspect during typical resolution switches
  389.             if (!old_aspect.num)
  390.                 old_aspect = (AVRational){1, 1};
  391.             if (2 * new_w * s->height == new_h * s->width)
  392.                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
  393.             if (new_w * s->height == 2 * new_h * s->width)
  394.                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});
  395.  
  396.             ret = ff_set_dimensions(s->avctx, new_w, new_h);
  397.             if (ret < 0)
  398.                 return ret;
  399.  
  400.             s->width  = new_w;
  401.             s->height = new_h;
  402.             if ((ret = ff_mpv_common_init(s)) < 0)
  403.                 return ret;
  404.         }
  405.  
  406.         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
  407.             av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max);
  408.         }
  409.     }
  410.     if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)
  411.         return AVERROR_INVALIDDATA;
  412.  
  413.     mb_pos = ff_h263_decode_mba(s);
  414.  
  415.     seq |= s->time & ~0x7FFF;
  416.     if (seq - s->time >  0x4000)
  417.         seq -= 0x8000;
  418.     if (seq - s->time < -0x4000)
  419.         seq += 0x8000;
  420.  
  421.     if (seq != s->time) {
  422.         if (s->pict_type != AV_PICTURE_TYPE_B) {
  423.             s->time            = seq;
  424.             s->pp_time         = s->time - s->last_non_b_time;
  425.             s->last_non_b_time = s->time;
  426.         } else {
  427.             s->time    = seq;
  428.             s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
  429.         }
  430.     }
  431.     if (s->pict_type == AV_PICTURE_TYPE_B) {
  432.         if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {
  433.             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.             return ERROR_SKIP_FRAME;
  437.         }
  438.         ff_mpeg4_init_direct_mv(s);
  439.     }
  440.  
  441.     s->no_rounding = get_bits1(&s->gb);
  442.  
  443.     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.         skip_bits(&s->gb, 5);
  446.  
  447.     s->f_code          = 1;
  448.     s->unrestricted_mv = 1;
  449.     s->h263_aic        = s->pict_type == AV_PICTURE_TYPE_I;
  450.     s->modified_quant  = 1;
  451.     if (!s->avctx->lowres)
  452.         s->loop_filter = 1;
  453.  
  454.     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
  455.         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.     av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);
  462.  
  463.     return s->mb_width * s->mb_height - mb_pos;
  464. }
  465.  
  466. static av_cold int rv10_decode_init(AVCodecContext *avctx)
  467. {
  468.     RVDecContext *rv = avctx->priv_data;
  469.     MpegEncContext *s = &rv->m;
  470.     static int done = 0;
  471.     int major_ver, minor_ver, micro_ver, ret;
  472.  
  473.     if (avctx->extradata_size < 8) {
  474.         av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
  475.         return AVERROR_INVALIDDATA;
  476.     }
  477.     if ((ret = av_image_check_size(avctx->coded_width,
  478.                                    avctx->coded_height, 0, avctx)) < 0)
  479.         return ret;
  480.  
  481.     ff_mpv_decode_defaults(s);
  482.     ff_mpv_decode_init(s, avctx);
  483.  
  484.     s->out_format  = FMT_H263;
  485.  
  486.     rv->orig_width  =
  487.     s->width        = avctx->coded_width;
  488.     rv->orig_height =
  489.     s->height       = avctx->coded_height;
  490.  
  491.     s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1;
  492.     rv->sub_id           = AV_RB32((uint8_t *) avctx->extradata + 4);
  493.  
  494.     major_ver = RV_GET_MAJOR_VER(rv->sub_id);
  495.     minor_ver = RV_GET_MINOR_VER(rv->sub_id);
  496.     micro_ver = RV_GET_MICRO_VER(rv->sub_id);
  497.  
  498.     s->low_delay = 1;
  499.     switch (major_ver) {
  500.     case 1:
  501.         s->rv10_version = micro_ver ? 3 : 1;
  502.         s->obmc         = micro_ver == 2;
  503.         break;
  504.     case 2:
  505.         if (minor_ver >= 2) {
  506.             s->low_delay           = 0;
  507.             s->avctx->has_b_frames = 1;
  508.         }
  509.         break;
  510.     default:
  511.         av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);
  512.         avpriv_request_sample(avctx, "RV1/2 version");
  513.         return AVERROR_PATCHWELCOME;
  514.     }
  515.  
  516.     if (avctx->debug & FF_DEBUG_PICT_INFO) {
  517.         av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id,
  518.                ((uint32_t *) avctx->extradata)[0]);
  519.     }
  520.  
  521.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  522.  
  523.     ff_mpv_idct_init(s);
  524.     if ((ret = ff_mpv_common_init(s)) < 0)
  525.         return ret;
  526.  
  527.     ff_h263dsp_init(&s->h263dsp);
  528.     ff_h263_decode_init_vlc();
  529.  
  530.     /* init rv vlc */
  531.     if (!done) {
  532.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,
  533.                         rv_lum_bits, 1, 1,
  534.                         rv_lum_code, 2, 2, 16384);
  535.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,
  536.                         rv_chrom_bits, 1, 1,
  537.                         rv_chrom_code, 2, 2, 16388);
  538.         done = 1;
  539.     }
  540.  
  541.     return 0;
  542. }
  543.  
  544. static av_cold int rv10_decode_end(AVCodecContext *avctx)
  545. {
  546.     MpegEncContext *s = avctx->priv_data;
  547.  
  548.     ff_mpv_common_end(s);
  549.     return 0;
  550. }
  551.  
  552. static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
  553.                               int buf_size, int buf_size2)
  554. {
  555.     RVDecContext *rv = avctx->priv_data;
  556.     MpegEncContext *s = &rv->m;
  557.     int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;
  558.  
  559.     active_bits_size = buf_size * 8;
  560.     init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);
  561.     if (s->codec_id == AV_CODEC_ID_RV10)
  562.         mb_count = rv10_decode_picture_header(s);
  563.     else
  564.         mb_count = rv20_decode_picture_header(rv);
  565.     if (mb_count < 0) {
  566.         if (mb_count != ERROR_SKIP_FRAME)
  567.             av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
  568.         return AVERROR_INVALIDDATA;
  569.     }
  570.  
  571.     if (s->mb_x >= s->mb_width ||
  572.         s->mb_y >= s->mb_height) {
  573.         av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
  574.         return AVERROR_INVALIDDATA;
  575.     }
  576.     mb_pos = s->mb_y * s->mb_width + s->mb_x;
  577.     left   = s->mb_width * s->mb_height - mb_pos;
  578.     if (mb_count > left) {
  579.         av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
  580.         return AVERROR_INVALIDDATA;
  581.     }
  582.  
  583.     if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {
  584.         // FIXME write parser so we always have complete frames?
  585.         if (s->current_picture_ptr) {
  586.             ff_er_frame_end(&s->er);
  587.             ff_mpv_frame_end(s);
  588.             s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
  589.         }
  590.         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
  591.             return ret;
  592.         ff_mpeg_er_frame_start(s);
  593.     } else {
  594.         if (s->current_picture_ptr->f->pict_type != s->pict_type) {
  595.             av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
  596.             return AVERROR_INVALIDDATA;
  597.         }
  598.     }
  599.  
  600.  
  601.     ff_dlog(avctx, "qscale=%d\n", s->qscale);
  602.  
  603.     /* default quantization values */
  604.     if (s->codec_id == AV_CODEC_ID_RV10) {
  605.         if (s->mb_y == 0)
  606.             s->first_slice_line = 1;
  607.     } else {
  608.         s->first_slice_line = 1;
  609.         s->resync_mb_x      = s->mb_x;
  610.     }
  611.     start_mb_x     = s->mb_x;
  612.     s->resync_mb_y = s->mb_y;
  613.     if (s->h263_aic) {
  614.         s->y_dc_scale_table =
  615.         s->c_dc_scale_table = ff_aic_dc_scale_table;
  616.     } else {
  617.         s->y_dc_scale_table =
  618.         s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
  619.     }
  620.  
  621.     if (s->modified_quant)
  622.         s->chroma_qscale_table = ff_h263_chroma_qscale_table;
  623.  
  624.     ff_set_qscale(s, s->qscale);
  625.  
  626.     s->rv10_first_dc_coded[0] = 0;
  627.     s->rv10_first_dc_coded[1] = 0;
  628.     s->rv10_first_dc_coded[2] = 0;
  629.     s->block_wrap[0] =
  630.     s->block_wrap[1] =
  631.     s->block_wrap[2] =
  632.     s->block_wrap[3] = s->b8_stride;
  633.     s->block_wrap[4] =
  634.     s->block_wrap[5] = s->mb_stride;
  635.     ff_init_block_index(s);
  636.  
  637.     /* decode each macroblock */
  638.     for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {
  639.         int ret;
  640.         ff_update_block_index(s);
  641.         ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
  642.  
  643.         s->mv_dir  = MV_DIR_FORWARD;
  644.         s->mv_type = MV_TYPE_16X16;
  645.         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.         if (ret != SLICE_ERROR) {
  650.             int v = show_bits(&s->gb, 16);
  651.  
  652.             if (get_bits_count(&s->gb) + 16 > active_bits_size)
  653.                 v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
  654.  
  655.             if (!v)
  656.                 ret = SLICE_END;
  657.         }
  658.         if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
  659.             8 * buf_size2 >= get_bits_count(&s->gb)) {
  660.             active_bits_size = buf_size2 * 8;
  661.             av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
  662.                    8 * buf_size, active_bits_size);
  663.             ret = SLICE_OK;
  664.         }
  665.  
  666.         if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {
  667.             av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,
  668.                    s->mb_y);
  669.             return AVERROR_INVALIDDATA;
  670.         }
  671.         if (s->pict_type != AV_PICTURE_TYPE_B)
  672.             ff_h263_update_motion_val(s);
  673.         ff_mpv_decode_mb(s, s->block);
  674.         if (s->loop_filter)
  675.             ff_h263_loop_filter(s);
  676.  
  677.         if (++s->mb_x == s->mb_width) {
  678.             s->mb_x = 0;
  679.             s->mb_y++;
  680.             ff_init_block_index(s);
  681.         }
  682.         if (s->mb_x == s->resync_mb_x)
  683.             s->first_slice_line = 0;
  684.         if (ret == SLICE_END)
  685.             break;
  686.     }
  687.  
  688.     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.     return active_bits_size;
  692. }
  693.  
  694. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
  695. {
  696.     if (avctx->slice_count)
  697.         return avctx->slice_offset[n];
  698.     else
  699.         return AV_RL32(buf + n * 8);
  700. }
  701.  
  702. static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  703.                              AVPacket *avpkt)
  704. {
  705.     const uint8_t *buf = avpkt->data;
  706.     int buf_size       = avpkt->size;
  707.     MpegEncContext *s = avctx->priv_data;
  708.     AVFrame *pict = data;
  709.     int i, ret;
  710.     int slice_count;
  711.     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.     if (buf_size == 0) {
  717.         return 0;
  718.     }
  719.  
  720.     if (!avctx->slice_count) {
  721.         slice_count = (*buf++) + 1;
  722.         buf_size--;
  723.  
  724.         if (!slice_count || buf_size <= 8 * slice_count) {
  725.             av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",
  726.                    slice_count);
  727.             return AVERROR_INVALIDDATA;
  728.         }
  729.  
  730.         slices_hdr = buf + 4;
  731.         buf       += 8 * slice_count;
  732.         buf_size  -= 8 * slice_count;
  733.     } else
  734.         slice_count = avctx->slice_count;
  735.  
  736.     for (i = 0; i < slice_count; i++) {
  737.         unsigned offset = get_slice_offset(avctx, slices_hdr, i);
  738.         int size, size2;
  739.  
  740.         if (offset >= buf_size)
  741.             return AVERROR_INVALIDDATA;
  742.  
  743.         if (i + 1 == slice_count)
  744.             size = buf_size - offset;
  745.         else
  746.             size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;
  747.  
  748.         if (i + 2 >= slice_count)
  749.             size2 = buf_size - offset;
  750.         else
  751.             size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;
  752.  
  753.         if (size <= 0 || size2 <= 0 ||
  754.             offset + FFMAX(size, size2) > buf_size)
  755.             return AVERROR_INVALIDDATA;
  756.  
  757.         if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2)) < 0)
  758.             return ret;
  759.  
  760.         if (ret > 8 * size)
  761.             i++;
  762.     }
  763.  
  764.     if (s->current_picture_ptr && s->mb_y >= s->mb_height) {
  765.         ff_er_frame_end(&s->er);
  766.         ff_mpv_frame_end(s);
  767.  
  768.         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
  769.             if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
  770.                 return ret;
  771.             ff_print_debug_info(s, s->current_picture_ptr, pict);
  772.             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
  773.         } else if (s->last_picture_ptr) {
  774.             if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
  775.                 return ret;
  776.             ff_print_debug_info(s, s->last_picture_ptr, pict);
  777.             ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
  778.         }
  779.  
  780.         if (s->last_picture_ptr || s->low_delay) {
  781.             *got_frame = 1;
  782.         }
  783.  
  784.         // so we can detect if frame_end was not called (find some nicer solution...)
  785.         s->current_picture_ptr = NULL;
  786.     }
  787.  
  788.     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. };
  825.