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FFmpeg/libavcodec/rv10.c

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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 Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; 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. 

  30. #include "avcodec.h"

  31. #include "error_resilience.h"

  32. #include "h263.h"

  33. #include "internal.h"

  34. #include "mpegvideo.h"

  35. #include "mpeg4video.h"

  36. 

  37. #define RV_GET_MAJOR_VER(x)  ((x) >> 28)

  38. #define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)

  39. #define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)

  40. 

  41. #define DC_VLC_BITS 14 // FIXME find a better solution

  42. 

  43. typedef struct RVDecContext {

  44.     MpegEncContext m;

  45.     int sub_id;

  46. } RVDecContext;

  47. 

  48. static const uint16_t rv_lum_code[256] = {

  49.     0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  50.     0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  51.     0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  52.     0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  53.     0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  54.     0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  55.     0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  56.     0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  57.     0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  58.     0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  59.     0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  60.     0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  61.     0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  62.     0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  63.     0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  64.     0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  65.     0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  66.     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  67.     0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  68.     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  69.     0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  70.     0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  71.     0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  72.     0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  73.     0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  74.     0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  75.     0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  76.     0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  77.     0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  78.     0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  79.     0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  80.     0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  81. };

  82. 

  83. static const uint8_t rv_lum_bits[256] = {

  84.     14, 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, 12, 12, 12, 12, 12, 12, 12,

  91.     12, 12, 12, 12, 12, 12, 12, 12,

  92.     12, 10, 10, 10, 10, 10, 10, 10,

  93.     10, 10, 10, 10, 10, 10, 10, 10,

  94.     10, 10, 10, 10, 10, 10, 10, 10,

  95.     10, 10, 10, 10, 10, 10, 10, 10,

  96.     10,  8,  8,  8,  8,  8,  8,  8,

  97.      8,  8,  8,  8,  8,  8,  8,  8,

  98.      8,  7,  7,  7,  7,  7,  7,  7,

  99.      7,  6,  6,  6,  6,  5,  5,  4,

  100.      2,  4,  5,  5,  6,  6,  6,  6,

  101.      7,  7,  7,  7,  7,  7,  7,  7,

  102.      8,  8,  8,  8,  8,  8,  8,  8,

  103.      8,  8,  8,  8,  8,  8,  8,  8,

  104.     10, 10, 10, 10, 10, 10, 10, 10,

  105.     10, 10, 10, 10, 10, 10, 10, 10,

  106.     10, 10, 10, 10, 10, 10, 10, 10,

  107.     10, 10, 10, 10, 10, 10, 10, 10,

  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.     12, 12, 12, 12, 12, 12, 12, 12,

  115.     12, 12, 12, 12, 12, 12, 12, 12,

  116. };

  117. 

  118. static const uint16_t rv_chrom_code[256] = {

  119.     0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  120.     0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  121.     0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  122.     0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  123.     0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  124.     0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  125.     0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  126.     0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  127.     0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  128.     0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  129.     0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  130.     0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  131.     0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  132.     0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  133.     0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  134.     0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  135.     0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  136.     0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  137.     0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  138.     0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  139.     0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  140.     0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  141.     0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  142.     0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  143.     0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  144.     0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  145.     0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  146.     0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  147.     0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  148.     0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  149.     0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  150.     0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  151. };

  152. 

  153. static const uint8_t rv_chrom_bits[256] = {

  154.     16, 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, 14, 14, 14, 14, 14, 14, 14,

  161.     14, 14, 14, 14, 14, 14, 14, 14,

  162.     14, 12, 12, 12, 12, 12, 12, 12,

  163.     12, 12, 12, 12, 12, 12, 12, 12,

  164.     12, 12, 12, 12, 12, 12, 12, 12,

  165.     12, 12, 12, 12, 12, 12, 12, 12,

  166.     12, 10, 10, 10, 10, 10, 10, 10,

  167.     10, 10, 10, 10, 10, 10, 10, 10,

  168.     10,  8,  8,  8,  8,  8,  8,  8,

  169.      8,  6,  6,  6,  6,  4,  4,  3,

  170.      2,  3,  4,  4,  6,  6,  6,  6,

  171.      8,  8,  8,  8,  8,  8,  8,  8,

  172.     10, 10, 10, 10, 10, 10, 10, 10,

  173.     10, 10, 10, 10, 10, 10, 10, 10,

  174.     12, 12, 12, 12, 12, 12, 12, 12,

  175.     12, 12, 12, 12, 12, 12, 12, 12,

  176.     12, 12, 12, 12, 12, 12, 12, 12,

  177.     12, 12, 12, 12, 12, 12, 12, 12,

  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.     14, 14, 14, 14, 14, 14, 14, 14,

  185.     14, 14, 14, 14, 14, 14, 14, 14,

  186. };

  187. 

  188. static VLC rv_dc_lum, rv_dc_chrom;

  189. 

  190. int ff_rv_decode_dc(MpegEncContext *s, int n)

  191. {

  192.     int code;

  193. 

  194.     if (n < 4) {

  195.         code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);

  196.         if (code < 0) {

  197.             /* XXX: I don't understand why they use LONGER codes than

  198.              * necessary. The following code would be completely useless

  199.              * if they had thought about it !!! */

  200.             code = get_bits(&s->gb, 7);

  201.             if (code == 0x7c) {

  202.                 code = (int8_t) (get_bits(&s->gb, 7) + 1);

  203.             } else if (code == 0x7d) {

  204.                 code = -128 + get_bits(&s->gb, 7);

  205.             } else if (code == 0x7e) {

  206.                 if (get_bits1(&s->gb) == 0)

  207.                     code = (int8_t) (get_bits(&s->gb, 8) + 1);

  208.                 else

  209.                     code = (int8_t) (get_bits(&s->gb, 8));

  210.             } else if (code == 0x7f) {

  211.                 skip_bits(&s->gb, 11);

  212.                 code = 1;

  213.             }

  214.         } else {

  215.             code -= 128;

  216.         }

  217.     } else {

  218.         code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);

  219.         /* same remark */

  220.         if (code < 0) {

  221.             code = get_bits(&s->gb, 9);

  222.             if (code == 0x1fc) {

  223.                 code = (int8_t) (get_bits(&s->gb, 7) + 1);

  224.             } else if (code == 0x1fd) {

  225.                 code = -128 + get_bits(&s->gb, 7);

  226.             } else if (code == 0x1fe) {

  227.                 skip_bits(&s->gb, 9);

  228.                 code = 1;

  229.             } else {

  230.                 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");

  231.                 return 0xffff;

  232.             }

  233.         } else {

  234.             code -= 128;

  235.         }

  236.     }

  237.     return -code;

  238. }

  239. 

  240. /* read RV 1.0 compatible frame header */

  241. static int rv10_decode_picture_header(MpegEncContext *s)

  242. {

  243.     int mb_count, pb_frame, marker, mb_xy;

  244. 

  245.     marker = get_bits1(&s->gb);

  246. 

  247.     if (get_bits1(&s->gb))

  248.         s->pict_type = AV_PICTURE_TYPE_P;

  249.     else

  250.         s->pict_type = AV_PICTURE_TYPE_I;

  251. 

  252.     if (!marker)

  253.         av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");

  254. 

  255.     pb_frame = get_bits1(&s->gb);

  256. 

  257.     av_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);

  258. 

  259.     if (pb_frame) {

  260.         avpriv_request_sample(s->avctx, "pb frame");

  261.         return AVERROR_PATCHWELCOME;

  262.     }

  263. 

  264.     s->qscale = get_bits(&s->gb, 5);

  265.     if (s->qscale == 0) {

  266.         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");

  267.         return AVERROR_INVALIDDATA;

  268.     }

  269. 

  270.     if (s->pict_type == AV_PICTURE_TYPE_I) {

  271.         if (s->rv10_version == 3) {

  272.             /* specific MPEG like DC coding not used */

  273.             s->last_dc[0] = get_bits(&s->gb, 8);

  274.             s->last_dc[1] = get_bits(&s->gb, 8);

  275.             s->last_dc[2] = get_bits(&s->gb, 8);

  276.             av_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],

  277.                     s->last_dc[1], s->last_dc[2]);

  278.         }

  279.     }

  280.     /* if multiple packets per frame are sent, the position at which

  281.      * to display the macroblocks is coded here */

  282. 

  283.     mb_xy = s->mb_x + s->mb_y * s->mb_width;

  284.     if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {

  285.         s->mb_x  = get_bits(&s->gb, 6); /* mb_x */

  286.         s->mb_y  = get_bits(&s->gb, 6); /* mb_y */

  287.         mb_count = get_bits(&s->gb, 12);

  288.     } else {

  289.         s->mb_x  = 0;

  290.         s->mb_y  = 0;

  291.         mb_count = s->mb_width * s->mb_height;

  292.     }

  293.     skip_bits(&s->gb, 3);   /* ignored */

  294.     s->f_code          = 1;

  295.     s->unrestricted_mv = 1;

  296. 

  297.     return mb_count;

  298. }

  299. 

  300. static int rv20_decode_picture_header(RVDecContext *rv)

  301. {

  302.     MpegEncContext *s = &rv->m;

  303.     int seq, mb_pos, i, ret;

  304.     int rpr_bits;

  305. 

  306.     i = get_bits(&s->gb, 2);

  307.     switch (i) {

  308.     case 0:

  309.         s->pict_type = AV_PICTURE_TYPE_I;

  310.         break;

  311.     case 1:

  312.         s->pict_type = AV_PICTURE_TYPE_I;

  313.         break;                                  // hmm ...

  314.     case 2:

  315.         s->pict_type = AV_PICTURE_TYPE_P;

  316.         break;

  317.     case 3:

  318.         s->pict_type = AV_PICTURE_TYPE_B;

  319.         break;

  320.     default:

  321.         av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n");

  322.         return AVERROR_INVALIDDATA;

  323.     }

  324. 

  325.     if (s->last_picture_ptr == NULL && s->pict_type == AV_PICTURE_TYPE_B) {

  326.         av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");

  327.         return AVERROR_INVALIDDATA;

  328.     }

  329. 

  330.     if (get_bits1(&s->gb)) {

  331.         av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");

  332.         return AVERROR_INVALIDDATA;

  333.     }

  334. 

  335.     s->qscale = get_bits(&s->gb, 5);

  336.     if (s->qscale == 0) {

  337.         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");

  338.         return AVERROR_INVALIDDATA;

  339.     }

  340. 

  341.     if (RV_GET_MINOR_VER(rv->sub_id) >= 2)

  342.         s->loop_filter = get_bits1(&s->gb);

  343. 

  344.     if (RV_GET_MINOR_VER(rv->sub_id) <= 1)

  345.         seq = get_bits(&s->gb, 8) << 7;

  346.     else

  347.         seq = get_bits(&s->gb, 13) << 2;

  348. 

  349.     rpr_bits = s->avctx->extradata[1] & 7;

  350.     if (rpr_bits) {

  351.         int f, new_w, new_h;

  352.         rpr_bits = FFMIN((rpr_bits >> 1) + 1, 3);

  353. 

  354.         f = get_bits(&s->gb, rpr_bits);

  355. 

  356.         if (f) {

  357.             if (s->avctx->extradata_size < 8 + 2 * f) {

  358.                 av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");

  359.                 return AVERROR_INVALIDDATA;

  360.             }

  361. 

  362.             new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f];

  363.             new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f];

  364.         } else {

  365.             new_w = s->orig_width;

  366.             new_h = s->orig_height;

  367.         }

  368.         if (new_w != s->width || new_h != s->height) {

  369.             av_log(s->avctx, AV_LOG_DEBUG,

  370.                    "attempting to change resolution to %dx%d\n", new_w, new_h);

  371.             ff_MPV_common_end(s);

  372. 

  373.             ret = ff_set_dimensions(s->avctx, new_w, new_h);

  374.             if (ret < 0)

  375.                 return ret;

  376. 

  377.             s->width  = new_w;

  378.             s->height = new_h;

  379.             if ((ret = ff_MPV_common_init(s)) < 0)

  380.                 return ret;

  381.         }

  382. 

  383.         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {

  384.             av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d\n", f, rpr_bits);

  385.         }

  386.     } else if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)

  387.         return AVERROR_INVALIDDATA;

  388. 

  389.     mb_pos = ff_h263_decode_mba(s);

  390. 

  391.     seq |= s->time & ~0x7FFF;

  392.     if (seq - s->time >  0x4000)

  393.         seq -= 0x8000;

  394.     if (seq - s->time < -0x4000)

  395.         seq += 0x8000;

  396. 

  397.     if (seq != s->time) {

  398.         if (s->pict_type != AV_PICTURE_TYPE_B) {

  399.             s->time            = seq;

  400.             s->pp_time         = s->time - s->last_non_b_time;

  401.             s->last_non_b_time = s->time;

  402.         } else {

  403.             s->time    = seq;

  404.             s->pb_time = s->pp_time - (s->last_non_b_time - s->time);

  405.             if (s->pp_time <= s->pb_time ||

  406.                 s->pp_time <= s->pp_time - s->pb_time || s->pp_time <= 0) {

  407.                 av_log(s->avctx, AV_LOG_DEBUG, "messed up order, possible "

  408.                        "from seeking? skipping current b frame\n");

  409.                 return FRAME_SKIPPED;

  410.             }

  411.             ff_mpeg4_init_direct_mv(s);

  412.         }

  413.     }

  414. 

  415.     s->no_rounding = get_bits1(&s->gb);

  416. 

  417.     if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)

  418.         // binary decoder reads 3+2 bits here but they don't seem to be used

  419.         skip_bits(&s->gb, 5);

  420. 

  421.     s->f_code          = 1;

  422.     s->unrestricted_mv = 1;

  423.     s->h263_aic        = s->pict_type == AV_PICTURE_TYPE_I;

  424.     s->modified_quant  = 1;

  425.     s->loop_filter     = 1;

  426. 

  427.     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {

  428.         av_log(s->avctx, AV_LOG_INFO,

  429.                "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",

  430.                seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,

  431.                s->no_rounding);

  432.     }

  433. 

  434.     assert(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);

  435. 

  436.     return s->mb_width * s->mb_height - mb_pos;

  437. }

  438. 

  439. static av_cold int rv10_decode_init(AVCodecContext *avctx)

  440. {

  441.     RVDecContext *rv = avctx->priv_data;

  442.     MpegEncContext *s = &rv->m;

  443.     static int done = 0;

  444.     int major_ver, minor_ver, micro_ver, ret;

  445. 

  446.     if (avctx->extradata_size < 8) {

  447.         av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");

  448.         return AVERROR_INVALIDDATA;

  449.     }

  450.     if ((ret = av_image_check_size(avctx->coded_width,

  451.                                    avctx->coded_height, 0, avctx)) < 0)

  452.         return ret;

  453. 

  454.     ff_MPV_decode_defaults(s);

  455. 

  456.     s->avctx       = avctx;

  457.     s->out_format  = FMT_H263;

  458.     s->codec_id    = avctx->codec_id;

  459. 

  460.     s->orig_width  =

  461.     s->width       = avctx->coded_width;

  462.     s->orig_height =

  463.     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.                avctx->extradata_size >= 4 ? ((uint32_t *) avctx->extradata)[0]

  493.                                           : -1);

  494.     }

  495. 

  496.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  497. 

  498.     if ((ret = ff_MPV_common_init(s)) < 0)

  499.         return ret;

  500. 

  501.     ff_h263dsp_init(&s->h263dsp);

  502.     ff_h263_decode_init_vlc();

  503. 

  504.     /* init rv vlc */

  505.     if (!done) {

  506.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,

  507.                         rv_lum_bits, 1, 1,

  508.                         rv_lum_code, 2, 2, 16384);

  509.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,

  510.                         rv_chrom_bits, 1, 1,

  511.                         rv_chrom_code, 2, 2, 16388);

  512.         done = 1;

  513.     }

  514. 

  515.     return 0;

  516. }

  517. 

  518. static av_cold int rv10_decode_end(AVCodecContext *avctx)

  519. {

  520.     MpegEncContext *s = avctx->priv_data;

  521. 

  522.     ff_MPV_common_end(s);

  523.     return 0;

  524. }

  525. 

  526. static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,

  527.                               int buf_size, int buf_size2)

  528. {

  529.     RVDecContext *rv = avctx->priv_data;

  530.     MpegEncContext *s = &rv->m;

  531.     int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;

  532. 

  533.     active_bits_size = buf_size * 8;

  534.     init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);

  535.     if (s->codec_id == AV_CODEC_ID_RV10)

  536.         mb_count = rv10_decode_picture_header(s);

  537.     else

  538.         mb_count = rv20_decode_picture_header(rv);

  539.     if (mb_count < 0) {

  540.         av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");

  541.         return AVERROR_INVALIDDATA;

  542.     }

  543. 

  544.     if (s->mb_x >= s->mb_width ||

  545.         s->mb_y >= s->mb_height) {

  546.         av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);

  547.         return AVERROR_INVALIDDATA;

  548.     }

  549.     mb_pos = s->mb_y * s->mb_width + s->mb_x;

  550.     left   = s->mb_width * s->mb_height - mb_pos;

  551.     if (mb_count > left) {

  552.         av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");

  553.         return AVERROR_INVALIDDATA;

  554.     }

  555. 

  556.     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr == NULL) {

  557.         // FIXME write parser so we always have complete frames?

  558.         if (s->current_picture_ptr) {

  559.             ff_er_frame_end(&s->er);

  560.             ff_MPV_frame_end(s);

  561.             s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;

  562.         }

  563.         if ((ret = ff_MPV_frame_start(s, avctx)) < 0)

  564.             return ret;

  565.         ff_mpeg_er_frame_start(s);

  566.     } else {

  567.         if (s->current_picture_ptr->f.pict_type != s->pict_type) {

  568.             av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");

  569.             return AVERROR_INVALIDDATA;

  570.         }

  571.     }

  572. 

  573.     av_dlog(avctx, "qscale=%d\n", s->qscale);

  574. 

  575.     /* default quantization values */

  576.     if (s->codec_id == AV_CODEC_ID_RV10) {

  577.         if (s->mb_y == 0)

  578.             s->first_slice_line = 1;

  579.     } else {

  580.         s->first_slice_line = 1;

  581.         s->resync_mb_x      = s->mb_x;

  582.     }

  583.     start_mb_x     = s->mb_x;

  584.     s->resync_mb_y = s->mb_y;

  585.     if (s->h263_aic) {

  586.         s->y_dc_scale_table =

  587.         s->c_dc_scale_table = ff_aic_dc_scale_table;

  588.     } else {

  589.         s->y_dc_scale_table =

  590.         s->c_dc_scale_table = ff_mpeg1_dc_scale_table;

  591.     }

  592. 

  593.     if (s->modified_quant)

  594.         s->chroma_qscale_table = ff_h263_chroma_qscale_table;

  595. 

  596.     ff_set_qscale(s, s->qscale);

  597. 

  598.     s->rv10_first_dc_coded[0] = 0;

  599.     s->rv10_first_dc_coded[1] = 0;

  600.     s->rv10_first_dc_coded[2] = 0;

  601.     s->block_wrap[0] =

  602.     s->block_wrap[1] =

  603.     s->block_wrap[2] =

  604.     s->block_wrap[3] = s->b8_stride;

  605.     s->block_wrap[4] =

  606.     s->block_wrap[5] = s->mb_stride;

  607.     ff_init_block_index(s);

  608. 

  609.     /* decode each macroblock */

  610.     for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {

  611.         int ret;

  612.         ff_update_block_index(s);

  613.         av_dlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);

  614. 

  615.         s->mv_dir  = MV_DIR_FORWARD;

  616.         s->mv_type = MV_TYPE_16X16;

  617.         ret = ff_h263_decode_mb(s, s->block);

  618. 

  619.         // Repeat the slice end check from ff_h263_decode_mb with our active

  620.         // bitstream size

  621.         if (ret != SLICE_ERROR) {

  622.             int v = show_bits(&s->gb, 16);

  623. 

  624.             if (get_bits_count(&s->gb) + 16 > active_bits_size)

  625.                 v >>= get_bits_count(&s->gb) + 16 - active_bits_size;

  626. 

  627.             if (!v)

  628.                 ret = SLICE_END;

  629.         }

  630.         if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&

  631.             8 * buf_size2 >= get_bits_count(&s->gb)) {

  632.             active_bits_size = buf_size2 * 8;

  633.             av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",

  634.                    8 * buf_size, active_bits_size);

  635.             ret = SLICE_OK;

  636.         }

  637. 

  638.         if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {

  639.             av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,

  640.                    s->mb_y);

  641.             return AVERROR_INVALIDDATA;

  642.         }

  643.         if (s->pict_type != AV_PICTURE_TYPE_B)

  644.             ff_h263_update_motion_val(s);

  645.         ff_MPV_decode_mb(s, s->block);

  646.         if (s->loop_filter)

  647.             ff_h263_loop_filter(s);

  648. 

  649.         if (++s->mb_x == s->mb_width) {

  650.             s->mb_x = 0;

  651.             s->mb_y++;

  652.             ff_init_block_index(s);

  653.         }

  654.         if (s->mb_x == s->resync_mb_x)

  655.             s->first_slice_line = 0;

  656.         if (ret == SLICE_END)

  657.             break;

  658.     }

  659. 

  660.     ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,

  661.                     ER_MB_END);

  662. 

  663.     return active_bits_size;

  664. }

  665. 

  666. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

  667. {

  668.     if (avctx->slice_count)

  669.         return avctx->slice_offset[n];

  670.     else

  671.         return AV_RL32(buf + n * 8);

  672. }

  673. 

  674. static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  675.                              AVPacket *avpkt)

  676. {

  677.     const uint8_t *buf = avpkt->data;

  678.     int buf_size       = avpkt->size;

  679.     MpegEncContext *s = avctx->priv_data;

  680.     AVFrame *pict = data;

  681.     int i, ret;

  682.     int slice_count;

  683.     const uint8_t *slices_hdr = NULL;

  684. 

  685.     av_dlog(avctx, "*****frame %d size=%d\n", avctx->frame_number, buf_size);

  686. 

  687.     /* no supplementary picture */

  688.     if (buf_size == 0) {

  689.         return 0;

  690.     }

  691. 

  692.     if (!avctx->slice_count) {

  693.         slice_count = (*buf++) + 1;

  694.         buf_size--;

  695. 

  696.         if (!slice_count || buf_size <= 8 * slice_count) {

  697.             av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",

  698.                    slice_count);

  699.             return AVERROR_INVALIDDATA;

  700.         }

  701. 

  702.         slices_hdr = buf + 4;

  703.         buf       += 8 * slice_count;

  704.         buf_size  -= 8 * slice_count;

  705.     } else

  706.         slice_count = avctx->slice_count;

  707. 

  708.     for (i = 0; i < slice_count; i++) {

  709.         unsigned offset = get_slice_offset(avctx, slices_hdr, i);

  710.         int size, size2;

  711. 

  712.         if (offset >= buf_size)

  713.             return AVERROR_INVALIDDATA;

  714. 

  715.         if (i + 1 == slice_count)

  716.             size = buf_size - offset;

  717.         else

  718.             size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;

  719. 

  720.         if (i + 2 >= slice_count)

  721.             size2 = buf_size - offset;

  722.         else

  723.             size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;

  724. 

  725.         if (size <= 0 || size2 <= 0 ||

  726.             offset + FFMAX(size, size2) > buf_size)

  727.             return AVERROR_INVALIDDATA;

  728. 

  729.         if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2)) < 0)

  730.             return ret;

  731. 

  732.         if (ret > 8 * size)

  733.             i++;

  734.     }

  735. 

  736.     if (s->current_picture_ptr != NULL && s->mb_y >= s->mb_height) {

  737.         ff_er_frame_end(&s->er);

  738.         ff_MPV_frame_end(s);

  739. 

  740.         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  741.             if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)

  742.                 return ret;

  743.             ff_print_debug_info(s, s->current_picture_ptr);

  744.         } else if (s->last_picture_ptr != NULL) {

  745.             if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)

  746.                 return ret;

  747.             ff_print_debug_info(s, s->last_picture_ptr);

  748.         }

  749. 

  750.         if (s->last_picture_ptr || s->low_delay) {

  751.             *got_frame = 1;

  752.         }

  753. 

  754.         // so we can detect if frame_end was not called (find some nicer solution...)

  755.         s->current_picture_ptr = NULL;

  756.     }

  757. 

  758.     return avpkt->size;

  759. }

  760. 

  761. AVCodec ff_rv10_decoder = {

  762.     .name           = "rv10",

  763.     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),

  764.     .type           = AVMEDIA_TYPE_VIDEO,

  765.     .id             = AV_CODEC_ID_RV10,

  766.     .priv_data_size = sizeof(RVDecContext),

  767.     .init           = rv10_decode_init,

  768.     .close          = rv10_decode_end,

  769.     .decode         = rv10_decode_frame,

  770.     .capabilities   = CODEC_CAP_DR1,

  771.     .pix_fmts       = ff_pixfmt_list_420,

  772. };

  773. 

  774. AVCodec ff_rv20_decoder = {

  775.     .name           = "rv20",

  776.     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 2.0"),

  777.     .type           = AVMEDIA_TYPE_VIDEO,

  778.     .id             = AV_CODEC_ID_RV20,

  779.     .priv_data_size = sizeof(RVDecContext),

  780.     .init           = rv10_decode_init,

  781.     .close          = rv10_decode_end,

  782.     .decode         = rv10_decode_frame,

  783.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  784.     .flush          = ff_mpeg_flush,

  785.     .pix_fmts       = ff_pixfmt_list_420,

  786. };