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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 <inttypes.h>

  29. 

  30. #include "libavutil/imgutils.h"

  31. 

  32. #include "avcodec.h"

  33. #include "error_resilience.h"

  34. #include "h263.h"

  35. #include "internal.h"

  36. #include "mpegvideo.h"

  37. #include "mpeg4video.h"

  38. 

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

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

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

  42. 

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

  44. 

  45. typedef struct RVDecContext {

  46.     MpegEncContext m;

  47.     int sub_id;

  48. } RVDecContext;

  49. 

  50. static const uint16_t rv_lum_code[256] = {

  51.     0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  52.     0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  53.     0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  54.     0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  55.     0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  56.     0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  57.     0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  58.     0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  59.     0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  60.     0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  61.     0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  62.     0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  63.     0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  64.     0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  65.     0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  66.     0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  67.     0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  68.     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  69.     0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  70.     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  71.     0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  72.     0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  73.     0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  74.     0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  75.     0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  76.     0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  77.     0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  78.     0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  79.     0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  80.     0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  81.     0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  82.     0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  83. };

  84. 

  85. static const uint8_t rv_lum_bits[256] = {

  86.     14, 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, 12, 12, 12, 12, 12, 12, 12,

  93.     12, 12, 12, 12, 12, 12, 12, 12,

  94.     12, 10, 10, 10, 10, 10, 10, 10,

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

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

  97.     10, 10, 10, 10, 10, 10, 10, 10,

  98.     10,  8,  8,  8,  8,  8,  8,  8,

  99.      8,  8,  8,  8,  8,  8,  8,  8,

  100.      8,  7,  7,  7,  7,  7,  7,  7,

  101.      7,  6,  6,  6,  6,  5,  5,  4,

  102.      2,  4,  5,  5,  6,  6,  6,  6,

  103.      7,  7,  7,  7,  7,  7,  7,  7,

  104.      8,  8,  8,  8,  8,  8,  8,  8,

  105.      8,  8,  8,  8,  8,  8,  8,  8,

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

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

  108.     10, 10, 10, 10, 10, 10, 10, 10,

  109.     10, 10, 10, 10, 10, 10, 10, 10,

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

  117.     12, 12, 12, 12, 12, 12, 12, 12,

  118. };

  119. 

  120. static const uint16_t rv_chrom_code[256] = {

  121.     0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  122.     0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  123.     0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  124.     0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  125.     0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  126.     0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  127.     0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  128.     0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  129.     0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  130.     0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  131.     0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  132.     0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  133.     0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  134.     0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  135.     0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  136.     0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  137.     0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  138.     0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  139.     0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  140.     0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  141.     0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  142.     0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  143.     0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  144.     0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  145.     0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  146.     0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  147.     0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  148.     0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  149.     0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  150.     0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  151.     0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  152.     0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  153. };

  154. 

  155. static const uint8_t rv_chrom_bits[256] = {

  156.     16, 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, 14, 14, 14, 14, 14, 14, 14,

  163.     14, 14, 14, 14, 14, 14, 14, 14,

  164.     14, 12, 12, 12, 12, 12, 12, 12,

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

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

  167.     12, 12, 12, 12, 12, 12, 12, 12,

  168.     12, 10, 10, 10, 10, 10, 10, 10,

  169.     10, 10, 10, 10, 10, 10, 10, 10,

  170.     10,  8,  8,  8,  8,  8,  8,  8,

  171.      8,  6,  6,  6,  6,  4,  4,  3,

  172.      2,  3,  4,  4,  6,  6,  6,  6,

  173.      8,  8,  8,  8,  8,  8,  8,  8,

  174.     10, 10, 10, 10, 10, 10, 10, 10,

  175.     10, 10, 10, 10, 10, 10, 10, 10,

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

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

  178.     12, 12, 12, 12, 12, 12, 12, 12,

  179.     12, 12, 12, 12, 12, 12, 12, 12,

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

  187.     14, 14, 14, 14, 14, 14, 14, 14,

  188. };

  189. 

  190. static VLC rv_dc_lum, rv_dc_chrom;

  191. 

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

  193. {

  194.     int code;

  195. 

  196.     if (n < 4) {

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

  198.         if (code < 0) {

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

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

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

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

  203.             if (code == 0x7c) {

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

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

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

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

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

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

  210.                 else

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

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

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

  214.                 code = 1;

  215.             }

  216.         } else {

  217.             code -= 128;

  218.         }

  219.     } else {

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

  221.         /* same remark */

  222.         if (code < 0) {

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

  224.             if (code == 0x1fc) {

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

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

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

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

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

  230.                 code = 1;

  231.             } else {

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

  233.                 return 0xffff;

  234.             }

  235.         } else {

  236.             code -= 128;

  237.         }

  238.     }

  239.     return -code;

  240. }

  241. 

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

  243. static int rv10_decode_picture_header(MpegEncContext *s)

  244. {

  245.     int mb_count, pb_frame, marker, mb_xy;

  246. 

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

  248. 

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

  250.         s->pict_type = AV_PICTURE_TYPE_P;

  251.     else

  252.         s->pict_type = AV_PICTURE_TYPE_I;

  253. 

  254.     if (!marker)

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

  256. 

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

  258. 

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

  260. 

  261.     if (pb_frame) {

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

  263.         return AVERROR_PATCHWELCOME;

  264.     }

  265. 

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

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

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

  269.         return AVERROR_INVALIDDATA;

  270.     }

  271. 

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

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

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

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

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

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

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

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

  280.         }

  281.     }

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

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

  284. 

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

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

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

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

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

  290.     } else {

  291.         s->mb_x  = 0;

  292.         s->mb_y  = 0;

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

  294.     }

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

  296.     s->f_code          = 1;

  297.     s->unrestricted_mv = 1;

  298. 

  299.     return mb_count;

  300. }

  301. 

  302. static int rv20_decode_picture_header(RVDecContext *rv)

  303. {

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

  305.     int seq, mb_pos, i, ret;

  306.     int rpr_bits;

  307. 

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

  309.     switch (i) {

  310.     case 0:

  311.         s->pict_type = AV_PICTURE_TYPE_I;

  312.         break;

  313.     case 1:

  314.         s->pict_type = AV_PICTURE_TYPE_I;

  315.         break;                                  // hmm ...

  316.     case 2:

  317.         s->pict_type = AV_PICTURE_TYPE_P;

  318.         break;

  319.     case 3:

  320.         s->pict_type = AV_PICTURE_TYPE_B;

  321.         break;

  322.     default:

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

  324.         return AVERROR_INVALIDDATA;

  325.     }

  326. 

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

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

  329.         return AVERROR_INVALIDDATA;

  330.     }

  331. 

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

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

  334.         return AVERROR_INVALIDDATA;

  335.     }

  336. 

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

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

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

  340.         return AVERROR_INVALIDDATA;

  341.     }

  342. 

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

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

  345. 

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

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

  348.     else

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

  350. 

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

  352.     if (rpr_bits) {

  353.         int f, new_w, new_h;

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

  355. 

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

  357. 

  358.         if (f) {

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

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

  361.                 return AVERROR_INVALIDDATA;

  362.             }

  363. 

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

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

  366.         } else {

  367.             new_w = s->orig_width;

  368.             new_h = s->orig_height;

  369.         }

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

  371.             av_log(s->avctx, AV_LOG_DEBUG,

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

  373.             ff_MPV_common_end(s);

  374. 

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

  376.             if (ret < 0)

  377.                 return ret;

  378. 

  379.             s->width  = new_w;

  380.             s->height = new_h;

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

  382.                 return ret;

  383.         }

  384. 

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

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

  387.         }

  388.     } else 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.             if (s->pp_time <= s->pb_time ||

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

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

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

  411.                 return FRAME_SKIPPED;

  412.             }

  413.             ff_mpeg4_init_direct_mv(s);

  414.         }

  415.     }

  416. 

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

  418. 

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

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

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

  422. 

  423.     s->f_code          = 1;

  424.     s->unrestricted_mv = 1;

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

  426.     s->modified_quant  = 1;

  427.     s->loop_filter     = 1;

  428. 

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

  430.         av_log(s->avctx, AV_LOG_INFO,

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

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

  433.                s->no_rounding);

  434.     }

  435. 

  436.     assert(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  =

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

  464.     s->orig_height =

  465.     s->height      = avctx->coded_height;

  466. 

  467.     s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1;

  468.     rv->sub_id           = AV_RB32((uint8_t *) avctx->extradata + 4);

  469. 

  470.     major_ver = RV_GET_MAJOR_VER(rv->sub_id);

  471.     minor_ver = RV_GET_MINOR_VER(rv->sub_id);

  472.     micro_ver = RV_GET_MICRO_VER(rv->sub_id);

  473. 

  474.     s->low_delay = 1;

  475.     switch (major_ver) {

  476.     case 1:

  477.         s->rv10_version = micro_ver ? 3 : 1;

  478.         s->obmc         = micro_ver == 2;

  479.         break;

  480.     case 2:

  481.         if (minor_ver >= 2) {

  482.             s->low_delay           = 0;

  483.             s->avctx->has_b_frames = 1;

  484.         }

  485.         break;

  486.     default:

  487.         av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);

  488.         avpriv_request_sample(avctx, "RV1/2 version");

  489.         return AVERROR_PATCHWELCOME;

  490.     }

  491. 

  492.     if (avctx->debug & FF_DEBUG_PICT_INFO) {

  493.         av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%X\n", rv->sub_id,

  494.                avctx->extradata_size >= 4 ? ((int *) avctx->extradata)[0] : -1);

  495.     }

  496. 

  497.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  498. 

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

  500.         return ret;

  501. 

  502.     ff_h263dsp_init(&s->h263dsp);

  503.     ff_h263_decode_init_vlc();

  504. 

  505.     /* init rv vlc */

  506.     if (!done) {

  507.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,

  508.                         rv_lum_bits, 1, 1,

  509.                         rv_lum_code, 2, 2, 16384);

  510.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,

  511.                         rv_chrom_bits, 1, 1,

  512.                         rv_chrom_code, 2, 2, 16388);

  513.         done = 1;

  514.     }

  515. 

  516.     return 0;

  517. }

  518. 

  519. static av_cold int rv10_decode_end(AVCodecContext *avctx)

  520. {

  521.     MpegEncContext *s = avctx->priv_data;

  522. 

  523.     ff_MPV_common_end(s);

  524.     return 0;

  525. }

  526. 

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

  528.                               int buf_size, int buf_size2)

  529. {

  530.     RVDecContext *rv = avctx->priv_data;

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

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

  533. 

  534.     active_bits_size = buf_size * 8;

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

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

  537.         mb_count = rv10_decode_picture_header(s);

  538.     else

  539.         mb_count = rv20_decode_picture_header(rv);

  540.     if (mb_count < 0) {

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

  542.         return AVERROR_INVALIDDATA;

  543.     }

  544. 

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

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

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

  548.         return AVERROR_INVALIDDATA;

  549.     }

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

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

  552.     if (mb_count > left) {

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

  554.         return AVERROR_INVALIDDATA;

  555.     }

  556. 

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

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

  559.         if (s->current_picture_ptr) {

  560.             ff_er_frame_end(&s->er);

  561.             ff_MPV_frame_end(s);

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

  563.         }

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

  565.             return ret;

  566.         ff_mpeg_er_frame_start(s);

  567.     } else {

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

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

  570.             return AVERROR_INVALIDDATA;

  571.         }

  572.     }

  573. 

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

  575. 

  576.     /* default quantization values */

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

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

  579.             s->first_slice_line = 1;

  580.     } else {

  581.         s->first_slice_line = 1;

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

  583.     }

  584.     start_mb_x     = s->mb_x;

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

  586.     if (s->h263_aic) {

  587.         s->y_dc_scale_table =

  588.         s->c_dc_scale_table = ff_aic_dc_scale_table;

  589.     } else {

  590.         s->y_dc_scale_table =

  591.         s->c_dc_scale_table = ff_mpeg1_dc_scale_table;

  592.     }

  593. 

  594.     if (s->modified_quant)

  595.         s->chroma_qscale_table = ff_h263_chroma_qscale_table;

  596. 

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

  598. 

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

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

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

  602.     s->block_wrap[0] =

  603.     s->block_wrap[1] =

  604.     s->block_wrap[2] =

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

  606.     s->block_wrap[4] =

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

  608.     ff_init_block_index(s);

  609. 

  610.     /* decode each macroblock */

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

  612.         int ret;

  613.         ff_update_block_index(s);

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

  615. 

  616.         s->mv_dir  = MV_DIR_FORWARD;

  617.         s->mv_type = MV_TYPE_16X16;

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

  619. 

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

  621.         // bitstream size

  622.         if (ret != SLICE_ERROR) {

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

  624. 

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

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

  627. 

  628.             if (!v)

  629.                 ret = SLICE_END;

  630.         }

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

  632.             8 * buf_size2 >= get_bits_count(&s->gb)) {

  633.             active_bits_size = buf_size2 * 8;

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

  635.                    8 * buf_size, active_bits_size);

  636.             ret = SLICE_OK;

  637.         }

  638. 

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

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

  641.                    s->mb_y);

  642.             return AVERROR_INVALIDDATA;

  643.         }

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

  645.             ff_h263_update_motion_val(s);

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

  647.         if (s->loop_filter)

  648.             ff_h263_loop_filter(s);

  649. 

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

  651.             s->mb_x = 0;

  652.             s->mb_y++;

  653.             ff_init_block_index(s);

  654.         }

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

  656.             s->first_slice_line = 0;

  657.         if (ret == SLICE_END)

  658.             break;

  659.     }

  660. 

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

  662.                     ER_MB_END);

  663. 

  664.     return active_bits_size;

  665. }

  666. 

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

  668. {

  669.     if (avctx->slice_count)

  670.         return avctx->slice_offset[n];

  671.     else

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

  673. }

  674. 

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

  676.                              AVPacket *avpkt)

  677. {

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

  679.     int buf_size       = avpkt->size;

  680.     MpegEncContext *s = avctx->priv_data;

  681.     AVFrame *pict = data;

  682.     int i, ret;

  683.     int slice_count;

  684.     const uint8_t *slices_hdr = NULL;

  685. 

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

  687. 

  688.     /* no supplementary picture */

  689.     if (buf_size == 0) {

  690.         return 0;

  691.     }

  692. 

  693.     if (!avctx->slice_count) {

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

  695.         buf_size--;

  696. 

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

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

  699.                    slice_count);

  700.             return AVERROR_INVALIDDATA;

  701.         }

  702. 

  703.         slices_hdr = buf + 4;

  704.         buf       += 8 * slice_count;

  705.         buf_size  -= 8 * slice_count;

  706.     } else

  707.         slice_count = avctx->slice_count;

  708. 

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

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

  711.         int size, size2;

  712. 

  713.         if (offset >= buf_size)

  714.             return AVERROR_INVALIDDATA;

  715. 

  716.         if (i + 1 == slice_count)

  717.             size = buf_size - offset;

  718.         else

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

  720. 

  721.         if (i + 2 >= slice_count)

  722.             size2 = buf_size - offset;

  723.         else

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

  725. 

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

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

  728.             return AVERROR_INVALIDDATA;

  729. 

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

  731.             return ret;

  732. 

  733.         if (ret > 8 * size)

  734.             i++;

  735.     }

  736. 

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

  738.         ff_er_frame_end(&s->er);

  739.         ff_MPV_frame_end(s);

  740. 

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

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

  743.                 return ret;

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

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

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

  747.                 return ret;

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

  749.         }

  750. 

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

  752.             *got_frame = 1;

  753.         }

  754. 

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

  756.         s->current_picture_ptr = NULL;

  757.     }

  758. 

  759.     return avpkt->size;

  760. }

  761. 

  762. AVCodec ff_rv10_decoder = {

  763.     .name           = "rv10",

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

  765.     .type           = AVMEDIA_TYPE_VIDEO,

  766.     .id             = AV_CODEC_ID_RV10,

  767.     .priv_data_size = sizeof(RVDecContext),

  768.     .init           = rv10_decode_init,

  769.     .close          = rv10_decode_end,

  770.     .decode         = rv10_decode_frame,

  771.     .capabilities   = CODEC_CAP_DR1,

  772.     .pix_fmts       = (const enum AVPixelFormat[]) {

  773.         AV_PIX_FMT_YUV420P,

  774.         AV_PIX_FMT_NONE

  775.     },

  776. };

  777. 

  778. AVCodec ff_rv20_decoder = {

  779.     .name           = "rv20",

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

  781.     .type           = AVMEDIA_TYPE_VIDEO,

  782.     .id             = AV_CODEC_ID_RV20,

  783.     .priv_data_size = sizeof(RVDecContext),

  784.     .init           = rv10_decode_init,

  785.     .close          = rv10_decode_end,

  786.     .decode         = rv10_decode_frame,

  787.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  788.     .flush          = ff_mpeg_flush,

  789.     .pix_fmts       = (const enum AVPixelFormat[]) {

  790.         AV_PIX_FMT_YUV420P,

  791.         AV_PIX_FMT_NONE

  792.     },

  793. };