Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  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 "libavutil/imgutils.h"
  29. #include "avcodec.h"
  30. #include "error_resilience.h"
  31. #include "mpegvideo.h"
  32. #include "mpeg4video.h"
  33. #include "h263.h"
  34.  
  35. #define RV_GET_MAJOR_VER(x)  ((x) >> 28)
  36. #define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)
  37. #define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)
  38.  
  39. #define DC_VLC_BITS 14 //FIXME find a better solution
  40.  
  41. typedef struct RVDecContext {
  42.     MpegEncContext m;
  43.     int sub_id;
  44. } RVDecContext;
  45.  
  46. static const uint16_t rv_lum_code[256] = {
  47.     0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,
  48.     0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,
  49.     0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,
  50.     0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,
  51.     0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,
  52.     0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,
  53.     0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,
  54.     0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,
  55.     0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,
  56.     0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,
  57.     0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,
  58.     0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,
  59.     0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,
  60.     0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,
  61.     0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,
  62.     0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,
  63.     0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,
  64.     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
  65.     0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
  66.     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
  67.     0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,
  68.     0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,
  69.     0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,
  70.     0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,
  71.     0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,
  72.     0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,
  73.     0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,
  74.     0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,
  75.     0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,
  76.     0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,
  77.     0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,
  78.     0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,
  79. };
  80.  
  81. static const uint8_t rv_lum_bits[256] = {
  82.     14, 12, 12, 12, 12, 12, 12, 12,
  83.     12, 12, 12, 12, 12, 12, 12, 12,
  84.     12, 12, 12, 12, 12, 12, 12, 12,
  85.     12, 12, 12, 12, 12, 12, 12, 12,
  86.     12, 12, 12, 12, 12, 12, 12, 12,
  87.     12, 12, 12, 12, 12, 12, 12, 12,
  88.     12, 12, 12, 12, 12, 12, 12, 12,
  89.     12, 12, 12, 12, 12, 12, 12, 12,
  90.     12, 10, 10, 10, 10, 10, 10, 10,
  91.     10, 10, 10, 10, 10, 10, 10, 10,
  92.     10, 10, 10, 10, 10, 10, 10, 10,
  93.     10, 10, 10, 10, 10, 10, 10, 10,
  94.     10,  8,  8,  8,  8,  8,  8,  8,
  95.      8,  8,  8,  8,  8,  8,  8,  8,
  96.      8,  7,  7,  7,  7,  7,  7,  7,
  97.      7,  6,  6,  6,  6,  5,  5,  4,
  98.      2,  4,  5,  5,  6,  6,  6,  6,
  99.      7,  7,  7,  7,  7,  7,  7,  7,
  100.      8,  8,  8,  8,  8,  8,  8,  8,
  101.      8,  8,  8,  8,  8,  8,  8,  8,
  102.     10, 10, 10, 10, 10, 10, 10, 10,
  103.     10, 10, 10, 10, 10, 10, 10, 10,
  104.     10, 10, 10, 10, 10, 10, 10, 10,
  105.     10, 10, 10, 10, 10, 10, 10, 10,
  106.     12, 12, 12, 12, 12, 12, 12, 12,
  107.     12, 12, 12, 12, 12, 12, 12, 12,
  108.     12, 12, 12, 12, 12, 12, 12, 12,
  109.     12, 12, 12, 12, 12, 12, 12, 12,
  110.     12, 12, 12, 12, 12, 12, 12, 12,
  111.     12, 12, 12, 12, 12, 12, 12, 12,
  112.     12, 12, 12, 12, 12, 12, 12, 12,
  113.     12, 12, 12, 12, 12, 12, 12, 12,
  114. };
  115.  
  116. static const uint16_t rv_chrom_code[256] = {
  117.     0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,
  118.     0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,
  119.     0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,
  120.     0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,
  121.     0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,
  122.     0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,
  123.     0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,
  124.     0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,
  125.     0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,
  126.     0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,
  127.     0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,
  128.     0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,
  129.     0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,
  130.     0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,
  131.     0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,
  132.     0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,
  133.     0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,
  134.     0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
  135.     0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,
  136.     0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,
  137.     0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,
  138.     0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,
  139.     0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,
  140.     0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,
  141.     0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,
  142.     0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,
  143.     0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,
  144.     0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,
  145.     0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,
  146.     0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,
  147.     0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,
  148.     0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,
  149. };
  150.  
  151. static const uint8_t rv_chrom_bits[256] = {
  152.     16, 14, 14, 14, 14, 14, 14, 14,
  153.     14, 14, 14, 14, 14, 14, 14, 14,
  154.     14, 14, 14, 14, 14, 14, 14, 14,
  155.     14, 14, 14, 14, 14, 14, 14, 14,
  156.     14, 14, 14, 14, 14, 14, 14, 14,
  157.     14, 14, 14, 14, 14, 14, 14, 14,
  158.     14, 14, 14, 14, 14, 14, 14, 14,
  159.     14, 14, 14, 14, 14, 14, 14, 14,
  160.     14, 12, 12, 12, 12, 12, 12, 12,
  161.     12, 12, 12, 12, 12, 12, 12, 12,
  162.     12, 12, 12, 12, 12, 12, 12, 12,
  163.     12, 12, 12, 12, 12, 12, 12, 12,
  164.     12, 10, 10, 10, 10, 10, 10, 10,
  165.     10, 10, 10, 10, 10, 10, 10, 10,
  166.     10,  8,  8,  8,  8,  8,  8,  8,
  167.      8,  6,  6,  6,  6,  4,  4,  3,
  168.      2,  3,  4,  4,  6,  6,  6,  6,
  169.      8,  8,  8,  8,  8,  8,  8,  8,
  170.     10, 10, 10, 10, 10, 10, 10, 10,
  171.     10, 10, 10, 10, 10, 10, 10, 10,
  172.     12, 12, 12, 12, 12, 12, 12, 12,
  173.     12, 12, 12, 12, 12, 12, 12, 12,
  174.     12, 12, 12, 12, 12, 12, 12, 12,
  175.     12, 12, 12, 12, 12, 12, 12, 12,
  176.     14, 14, 14, 14, 14, 14, 14, 14,
  177.     14, 14, 14, 14, 14, 14, 14, 14,
  178.     14, 14, 14, 14, 14, 14, 14, 14,
  179.     14, 14, 14, 14, 14, 14, 14, 14,
  180.     14, 14, 14, 14, 14, 14, 14, 14,
  181.     14, 14, 14, 14, 14, 14, 14, 14,
  182.     14, 14, 14, 14, 14, 14, 14, 14,
  183.     14, 14, 14, 14, 14, 14, 14, 14,
  184. };
  185.  
  186. static VLC rv_dc_lum, rv_dc_chrom;
  187.  
  188. int ff_rv_decode_dc(MpegEncContext *s, int n)
  189. {
  190.     int code;
  191.  
  192.     if (n < 4) {
  193.         code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);
  194.         if (code < 0) {
  195.             /* XXX: I don't understand why they use LONGER codes than
  196.                necessary. The following code would be completely useless
  197.                if they had thought about it !!! */
  198.             code = get_bits(&s->gb, 7);
  199.             if (code == 0x7c) {
  200.                 code = (int8_t)(get_bits(&s->gb, 7) + 1);
  201.             } else if (code == 0x7d) {
  202.                 code = -128 + get_bits(&s->gb, 7);
  203.             } else if (code == 0x7e) {
  204.                 if (get_bits1(&s->gb) == 0)
  205.                     code = (int8_t)(get_bits(&s->gb, 8) + 1);
  206.                 else
  207.                     code = (int8_t)(get_bits(&s->gb, 8));
  208.             } else if (code == 0x7f) {
  209.                 skip_bits(&s->gb, 11);
  210.                 code = 1;
  211.             }
  212.         } else {
  213.             code -= 128;
  214.         }
  215.     } else {
  216.         code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);
  217.         /* same remark */
  218.         if (code < 0) {
  219.             code = get_bits(&s->gb, 9);
  220.             if (code == 0x1fc) {
  221.                 code = (int8_t)(get_bits(&s->gb, 7) + 1);
  222.             } else if (code == 0x1fd) {
  223.                 code = -128 + get_bits(&s->gb, 7);
  224.             } else if (code == 0x1fe) {
  225.                 skip_bits(&s->gb, 9);
  226.                 code = 1;
  227.             } else {
  228.                 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");
  229.                 return 0xffff;
  230.             }
  231.         } else {
  232.             code -= 128;
  233.         }
  234.     }
  235.     return -code;
  236. }
  237.  
  238. /* read RV 1.0 compatible frame header */
  239. static int rv10_decode_picture_header(MpegEncContext *s)
  240. {
  241.     int mb_count, pb_frame, marker, mb_xy;
  242.  
  243.     marker = get_bits1(&s->gb);
  244.  
  245.     if (get_bits1(&s->gb))
  246.         s->pict_type = AV_PICTURE_TYPE_P;
  247.     else
  248.         s->pict_type = AV_PICTURE_TYPE_I;
  249.  
  250.     if (!marker)
  251.         av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
  252.  
  253.     pb_frame = get_bits1(&s->gb);
  254.  
  255.     av_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);
  256.  
  257.     if (pb_frame) {
  258.         avpriv_request_sample(s->avctx, "pb frame");
  259.         return AVERROR_PATCHWELCOME;
  260.     }
  261.  
  262.     s->qscale = get_bits(&s->gb, 5);
  263.     if (s->qscale == 0) {
  264.         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
  265.         return AVERROR_INVALIDDATA;
  266.     }
  267.  
  268.     if (s->pict_type == AV_PICTURE_TYPE_I) {
  269.         if (s->rv10_version == 3) {
  270.             /* specific MPEG like DC coding not used */
  271.             s->last_dc[0] = get_bits(&s->gb, 8);
  272.             s->last_dc[1] = get_bits(&s->gb, 8);
  273.             s->last_dc[2] = get_bits(&s->gb, 8);
  274.             av_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],
  275.                     s->last_dc[1], s->last_dc[2]);
  276.         }
  277.     }
  278.     /* if multiple packets per frame are sent, the position at which
  279.        to display the macroblocks is coded here */
  280.  
  281.     mb_xy = s->mb_x + s->mb_y * s->mb_width;
  282.     if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {
  283.         s->mb_x  = get_bits(&s->gb, 6); /* mb_x */
  284.         s->mb_y  = get_bits(&s->gb, 6); /* mb_y */
  285.         mb_count = get_bits(&s->gb, 12);
  286.     } else {
  287.         s->mb_x  = 0;
  288.         s->mb_y  = 0;
  289.         mb_count = s->mb_width * s->mb_height;
  290.     }
  291.     skip_bits(&s->gb, 3);   /* ignored */
  292.     s->f_code = 1;
  293.     s->unrestricted_mv = 1;
  294.  
  295.     return mb_count;
  296. }
  297.  
  298. static int rv20_decode_picture_header(RVDecContext *rv)
  299. {
  300.     MpegEncContext *s = &rv->m;
  301.     int seq, mb_pos, i, ret;
  302.     int rpr_bits;
  303.  
  304.     i = get_bits(&s->gb, 2);
  305.     switch(i) {
  306.     case 0: s->pict_type = AV_PICTURE_TYPE_I; break;
  307.     case 1: s->pict_type = AV_PICTURE_TYPE_I; break; //hmm ...
  308.     case 2: s->pict_type = AV_PICTURE_TYPE_P; break;
  309.     case 3: s->pict_type = AV_PICTURE_TYPE_B; break;
  310.     default:
  311.         av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n");
  312.         return AVERROR_INVALIDDATA;
  313.     }
  314.  
  315.     if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {
  316.         av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
  317.         return -1;
  318.     }
  319.     if (s->last_picture_ptr == NULL && s->pict_type == AV_PICTURE_TYPE_B) {
  320.         av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
  321.         return AVERROR_INVALIDDATA;
  322.     }
  323.  
  324.     if (get_bits1(&s->gb)) {
  325.         av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");
  326.         return AVERROR_INVALIDDATA;
  327.     }
  328.  
  329.     s->qscale = get_bits(&s->gb, 5);
  330.     if (s->qscale == 0) {
  331.         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
  332.         return AVERROR_INVALIDDATA;
  333.     }
  334.  
  335.     if (RV_GET_MINOR_VER(rv->sub_id) >= 2)
  336.         s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;
  337.  
  338.     if (RV_GET_MINOR_VER(rv->sub_id) <= 1)
  339.         seq = get_bits(&s->gb, 8) << 7;
  340.     else
  341.         seq = get_bits(&s->gb, 13) << 2;
  342.  
  343.     rpr_bits = s->avctx->extradata[1] & 7;
  344.     if (rpr_bits) {
  345.         int f, new_w, new_h;
  346.         rpr_bits = FFMIN((rpr_bits >> 1) + 1, 3);
  347.  
  348.         f = get_bits(&s->gb, rpr_bits);
  349.  
  350.         if (f) {
  351.             if (s->avctx->extradata_size < 8 + 2 * f) {
  352.                 av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
  353.                 return AVERROR_INVALIDDATA;
  354.             }
  355.  
  356.             new_w = 4 * ((uint8_t*)s->avctx->extradata)[6 + 2 * f];
  357.             new_h = 4 * ((uint8_t*)s->avctx->extradata)[7 + 2 * f];
  358.         } else {
  359.             new_w = s->orig_width ;
  360.             new_h = s->orig_height;
  361.         }
  362.         if (new_w != s->width || new_h != s->height) {
  363.             AVRational old_aspect = s->avctx->sample_aspect_ratio;
  364.             av_log(s->avctx, AV_LOG_DEBUG,
  365.                    "attempting to change resolution to %dx%d\n", new_w, new_h);
  366.             if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
  367.                 return AVERROR_INVALIDDATA;
  368.             ff_MPV_common_end(s);
  369.  
  370.             // attempt to keep aspect during typical resolution switches
  371.             if (!old_aspect.num)
  372.                 old_aspect = (AVRational){1, 1};
  373.             if (2 * new_w * s->height == new_h * s->width)
  374.                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
  375.             if (new_w * s->height == 2 * new_h * s->width)
  376.                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});
  377.             avcodec_set_dimensions(s->avctx, new_w, new_h);
  378.             s->width  = new_w;
  379.             s->height = new_h;
  380.             if ((ret = ff_MPV_common_init(s)) < 0)
  381.                 return ret;
  382.         }
  383.  
  384.         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
  385.             av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d\n", f, rpr_bits);
  386.         }
  387.     }
  388.     if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)
  389.         return AVERROR_INVALIDDATA;
  390.  
  391.     mb_pos = ff_h263_decode_mba(s);
  392.  
  393.     seq |= s->time & ~0x7FFF;
  394.     if (seq - s->time >  0x4000)
  395.         seq -= 0x8000;
  396.     if (seq - s->time < -0x4000)
  397.         seq += 0x8000;
  398.  
  399.     if (seq != s->time) {
  400.         if (s->pict_type != AV_PICTURE_TYPE_B) {
  401.             s->time            = seq;
  402.             s->pp_time         = s->time - s->last_non_b_time;
  403.             s->last_non_b_time = s->time;
  404.         } else {
  405.             s->time    = seq;
  406.             s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
  407.         }
  408.     }
  409.     if (s->pict_type == AV_PICTURE_TYPE_B) {
  410.         if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {
  411.             av_log(s->avctx, AV_LOG_DEBUG,
  412.                    "messed up order, possible from seeking? skipping current b frame\n");
  413. #define ERROR_SKIP_FRAME -123
  414.             return ERROR_SKIP_FRAME;
  415.         }
  416.         ff_mpeg4_init_direct_mv(s);
  417.     }
  418.  
  419.     s->no_rounding = get_bits1(&s->gb);
  420.  
  421.     if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)
  422.         skip_bits(&s->gb, 5); // binary decoder reads 3+2 bits here but they don't seem to be used
  423.  
  424.     s->f_code          = 1;
  425.     s->unrestricted_mv = 1;
  426.     s->h263_aic        = s->pict_type == AV_PICTURE_TYPE_I;
  427.     s->modified_quant  = 1;
  428.     if (!s->avctx->lowres)
  429.         s->loop_filter = 1;
  430.  
  431.     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
  432.         av_log(s->avctx, AV_LOG_INFO, "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
  433.                seq, s->mb_x, s->mb_y, s->pict_type, s->qscale, s->no_rounding);
  434.     }
  435.  
  436.     av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);
  437.  
  438.     return s->mb_width*s->mb_height - mb_pos;
  439. }
  440.  
  441. static av_cold int rv10_decode_init(AVCodecContext *avctx)
  442. {
  443.     RVDecContext  *rv = avctx->priv_data;
  444.     MpegEncContext *s = &rv->m;
  445.     static int done = 0;
  446.     int major_ver, minor_ver, micro_ver, ret;
  447.  
  448.     if (avctx->extradata_size < 8) {
  449.         av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
  450.         return AVERROR_INVALIDDATA;
  451.     }
  452.     if ((ret = av_image_check_size(avctx->coded_width,
  453.                                    avctx->coded_height, 0, avctx)) < 0)
  454.         return ret;
  455.  
  456.     ff_MPV_decode_defaults(s);
  457.  
  458.     s->avctx      = avctx;
  459.     s->out_format = FMT_H263;
  460.     s->codec_id   = avctx->codec_id;
  461.  
  462.     s->orig_width  = s->width  = avctx->coded_width;
  463.     s->orig_height = s->height = avctx->coded_height;
  464.  
  465.     s->h263_long_vectors = ((uint8_t*)avctx->extradata)[3] & 1;
  466.     rv->sub_id           = AV_RB32((uint8_t*)avctx->extradata + 4);
  467.  
  468.     major_ver = RV_GET_MAJOR_VER(rv->sub_id);
  469.     minor_ver = RV_GET_MINOR_VER(rv->sub_id);
  470.     micro_ver = RV_GET_MICRO_VER(rv->sub_id);
  471.  
  472.     s->low_delay = 1;
  473.     switch (major_ver) {
  474.     case 1:
  475.         s->rv10_version = micro_ver ? 3 : 1;
  476.         s->obmc         = micro_ver == 2;
  477.         break;
  478.     case 2:
  479.         if (minor_ver >= 2) {
  480.             s->low_delay           = 0;
  481.             s->avctx->has_b_frames = 1;
  482.         }
  483.         break;
  484.     default:
  485.         av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);
  486.         avpriv_request_sample(avctx, "RV1/2 version");
  487.         return AVERROR_PATCHWELCOME;
  488.     }
  489.  
  490.     if (avctx->debug & FF_DEBUG_PICT_INFO) {
  491.         av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%X\n", rv->sub_id,
  492.                ((uint32_t*)avctx->extradata)[0]);
  493.     }
  494.  
  495.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  496.  
  497.     if ((ret = ff_MPV_common_init(s)) < 0)
  498.         return ret;
  499.  
  500.     ff_h263_decode_init_vlc();
  501.  
  502.     /* init rv vlc */
  503.     if (!done) {
  504.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,
  505.                         rv_lum_bits, 1, 1,
  506.                         rv_lum_code, 2, 2, 16384);
  507.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,
  508.                         rv_chrom_bits, 1, 1,
  509.                         rv_chrom_code, 2, 2, 16388);
  510.         done = 1;
  511.     }
  512.  
  513.     return 0;
  514. }
  515.  
  516. static av_cold int rv10_decode_end(AVCodecContext *avctx)
  517. {
  518.     MpegEncContext *s = avctx->priv_data;
  519.  
  520.     ff_MPV_common_end(s);
  521.     return 0;
  522. }
  523.  
  524. static int rv10_decode_packet(AVCodecContext *avctx,
  525.                               const uint8_t *buf, int buf_size, int buf_size2)
  526. {
  527.     RVDecContext  *rv = avctx->priv_data;
  528.     MpegEncContext *s = &rv->m;
  529.     int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;
  530.  
  531.     active_bits_size = buf_size * 8;
  532.     init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);
  533.     if (s->codec_id == AV_CODEC_ID_RV10)
  534.         mb_count = rv10_decode_picture_header(s);
  535.     else
  536.         mb_count = rv20_decode_picture_header(rv);
  537.     if (mb_count < 0) {
  538.         if (mb_count != ERROR_SKIP_FRAME)
  539.             av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
  540.         return AVERROR_INVALIDDATA;
  541.     }
  542.  
  543.     if (s->mb_x >= s->mb_width ||
  544.         s->mb_y >= s->mb_height) {
  545.         av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
  546.         return AVERROR_INVALIDDATA;
  547.     }
  548.     mb_pos = s->mb_y * s->mb_width + s->mb_x;
  549.     left = s->mb_width * s->mb_height - mb_pos;
  550.     if (mb_count > left) {
  551.         av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
  552.         return AVERROR_INVALIDDATA;
  553.     }
  554.  
  555.     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr == NULL) {
  556.         if (s->current_picture_ptr) { // FIXME write parser so we always have complete frames?
  557.             ff_er_frame_end(&s->er);
  558.             ff_MPV_frame_end(s);
  559.             s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
  560.         }
  561.         if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
  562.             return ret;
  563.         ff_mpeg_er_frame_start(s);
  564.     } else {
  565.         if (s->current_picture_ptr->f.pict_type != s->pict_type) {
  566.             av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
  567.             return AVERROR_INVALIDDATA;
  568.         }
  569.     }
  570.  
  571.  
  572.     av_dlog(avctx, "qscale=%d\n", s->qscale);
  573.  
  574.     /* default quantization values */
  575.     if (s->codec_id == AV_CODEC_ID_RV10) {
  576.         if (s->mb_y == 0)
  577.             s->first_slice_line = 1;
  578.     } else {
  579.         s->first_slice_line = 1;
  580.         s->resync_mb_x      = s->mb_x;
  581.     }
  582.     start_mb_x     = s->mb_x;
  583.     s->resync_mb_y = s->mb_y;
  584.     if (s->h263_aic) {
  585.         s->y_dc_scale_table = s->c_dc_scale_table = ff_aic_dc_scale_table;
  586.     } else {
  587.         s->y_dc_scale_table = s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
  588.     }
  589.  
  590.     if (s->modified_quant)
  591.         s->chroma_qscale_table = ff_h263_chroma_qscale_table;
  592.  
  593.     ff_set_qscale(s, s->qscale);
  594.  
  595.     s->rv10_first_dc_coded[0] = 0;
  596.     s->rv10_first_dc_coded[1] = 0;
  597.     s->rv10_first_dc_coded[2] = 0;
  598.     s->block_wrap[0] =
  599.     s->block_wrap[1] =
  600.     s->block_wrap[2] =
  601.     s->block_wrap[3] = s->b8_stride;
  602.     s->block_wrap[4] =
  603.     s->block_wrap[5] = s->mb_stride;
  604.     ff_init_block_index(s);
  605.  
  606.     /* decode each macroblock */
  607.     for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {
  608.         int ret;
  609.         ff_update_block_index(s);
  610.         av_dlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
  611.  
  612.         s->mv_dir  = MV_DIR_FORWARD;
  613.         s->mv_type = MV_TYPE_16X16;
  614.         ret = ff_h263_decode_mb(s, s->block);
  615.  
  616.         // Repeat the slice end check from ff_h263_decode_mb with our active
  617.         // bitstream size
  618.         if (ret != SLICE_ERROR) {
  619.             int v = show_bits(&s->gb, 16);
  620.  
  621.             if (get_bits_count(&s->gb) + 16 > active_bits_size)
  622.                 v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
  623.  
  624.             if (!v)
  625.                 ret = SLICE_END;
  626.         }
  627.         if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
  628.             8 * buf_size2 >= get_bits_count(&s->gb)) {
  629.             active_bits_size = buf_size2 * 8;
  630.             av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
  631.                    8 * buf_size, active_bits_size);
  632.             ret = SLICE_OK;
  633.         }
  634.  
  635.         if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {
  636.             av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x, s->mb_y);
  637.             return AVERROR_INVALIDDATA;
  638.         }
  639.         if (s->pict_type != AV_PICTURE_TYPE_B)
  640.             ff_h263_update_motion_val(s);
  641.         ff_MPV_decode_mb(s, s->block);
  642.         if (s->loop_filter)
  643.             ff_h263_loop_filter(s);
  644.  
  645.         if (++s->mb_x == s->mb_width) {
  646.             s->mb_x = 0;
  647.             s->mb_y++;
  648.             ff_init_block_index(s);
  649.         }
  650.         if (s->mb_x == s->resync_mb_x)
  651.             s->first_slice_line = 0;
  652.         if (ret == SLICE_END)
  653.             break;
  654.     }
  655.  
  656.     ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y,
  657.                     ER_MB_END);
  658.  
  659.     return active_bits_size;
  660. }
  661.  
  662. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
  663. {
  664.     if (avctx->slice_count)
  665.         return avctx->slice_offset[n];
  666.     else
  667.         return AV_RL32(buf + n * 8);
  668. }
  669.  
  670. static int rv10_decode_frame(AVCodecContext *avctx,
  671.                              void *data, int *got_frame,
  672.                              AVPacket *avpkt)
  673. {
  674.     const uint8_t *buf = avpkt->data;
  675.     int buf_size       = avpkt->size;
  676.     MpegEncContext *s  = avctx->priv_data;
  677.     AVFrame *pict      = data;
  678.     int i, ret;
  679.     int slice_count;
  680.     const uint8_t *slices_hdr = NULL;
  681.  
  682.     av_dlog(avctx, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
  683.     s->flags  = avctx->flags;
  684.     s->flags2 = avctx->flags2;
  685.  
  686.     /* no supplementary picture */
  687.     if (buf_size == 0) {
  688.         return 0;
  689.     }
  690.  
  691.     if (!avctx->slice_count) {
  692.         slice_count = (*buf++) + 1;
  693.         buf_size--;
  694.  
  695.         if (!slice_count || buf_size <= 8 * slice_count) {
  696.             av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n", slice_count);
  697.             return AVERROR_INVALIDDATA;
  698.         }
  699.  
  700.         slices_hdr = buf + 4;
  701.         buf       += 8 * slice_count;
  702.         buf_size  -= 8 * slice_count;
  703.     } else
  704.         slice_count = avctx->slice_count;
  705.  
  706.     for (i = 0; i < slice_count; i++) {
  707.         unsigned offset = get_slice_offset(avctx, slices_hdr, i);
  708.         int size, size2;
  709.  
  710.         if (offset >= buf_size)
  711.             return AVERROR_INVALIDDATA;
  712.  
  713.         if (i + 1 == slice_count)
  714.             size = buf_size - offset;
  715.         else
  716.             size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;
  717.  
  718.         if (i + 2 >= slice_count)
  719.             size2 = buf_size - offset;
  720.         else
  721.             size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;
  722.  
  723.         if (size <= 0 || size2 <= 0 ||
  724.             offset + FFMAX(size, size2) > buf_size)
  725.             return AVERROR_INVALIDDATA;
  726.  
  727.         if (rv10_decode_packet(avctx, buf + offset, size, size2) > 8 * size)
  728.             i++;
  729.     }
  730.  
  731.     if (s->current_picture_ptr != NULL && s->mb_y >= s->mb_height) {
  732.         ff_er_frame_end(&s->er);
  733.         ff_MPV_frame_end(s);
  734.  
  735.         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
  736.             if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
  737.                 return ret;
  738.             ff_print_debug_info(s, s->current_picture_ptr, pict);
  739.             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
  740.         } else if (s->last_picture_ptr != NULL) {
  741.             if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
  742.                 return ret;
  743.             ff_print_debug_info(s, s->last_picture_ptr, pict);
  744.             ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
  745.         }
  746.  
  747.         if (s->last_picture_ptr || s->low_delay) {
  748.             *got_frame = 1;
  749.         }
  750.  
  751.         // so we can detect if frame_end was not called (find some nicer solution...)
  752.         s->current_picture_ptr = NULL;
  753.     }
  754.  
  755.     return avpkt->size;
  756. }
  757.  
  758. AVCodec ff_rv10_decoder = {
  759.     .name           = "rv10",
  760.     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),
  761.     .type           = AVMEDIA_TYPE_VIDEO,
  762.     .id             = AV_CODEC_ID_RV10,
  763.     .priv_data_size = sizeof(RVDecContext),
  764.     .init           = rv10_decode_init,
  765.     .close          = rv10_decode_end,
  766.     .decode         = rv10_decode_frame,
  767.     .capabilities   = CODEC_CAP_DR1,
  768.     .max_lowres     = 3,
  769.     .pix_fmts       = ff_pixfmt_list_420,
  770. };
  771.  
  772. AVCodec ff_rv20_decoder = {
  773.     .name           = "rv20",
  774.     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 2.0"),
  775.     .type           = AVMEDIA_TYPE_VIDEO,
  776.     .id             = AV_CODEC_ID_RV20,
  777.     .priv_data_size = sizeof(RVDecContext),
  778.     .init           = rv10_decode_init,
  779.     .close          = rv10_decode_end,
  780.     .decode         = rv10_decode_frame,
  781.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
  782.     .flush          = ff_mpeg_flush,
  783.     .max_lowres     = 3,
  784.     .pix_fmts       = ff_pixfmt_list_420,
  785. };
  786.