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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 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 "internal.h"

  32. #include "mpegvideo.h"

  33. #include "mpeg4video.h"

  34. #include "h263.h"

  35. 

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

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

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

  39. 

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

  41. 

  42. typedef struct RVDecContext {

  43.     MpegEncContext m;

  44.     int sub_id;

  45. } RVDecContext;

  46. 

  47. static const uint16_t rv_lum_code[256] = {

  48.     0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  49.     0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  50.     0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  51.     0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  52.     0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  53.     0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  54.     0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  55.     0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  56.     0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  57.     0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  58.     0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  59.     0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  60.     0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  61.     0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  62.     0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  63.     0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  64.     0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  65.     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  66.     0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  67.     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  68.     0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  69.     0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  70.     0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  71.     0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  72.     0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  73.     0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  74.     0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  75.     0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  76.     0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  77.     0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  78.     0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  79.     0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  80. };

  81. 

  82. static const uint8_t rv_lum_bits[256] = {

  83.     14, 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, 12, 12, 12, 12, 12, 12, 12,

  91.     12, 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, 10, 10, 10, 10, 10, 10, 10,

  95.     10,  8,  8,  8,  8,  8,  8,  8,

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

  97.      8,  7,  7,  7,  7,  7,  7,  7,

  98.      7,  6,  6,  6,  6,  5,  5,  4,

  99.      2,  4,  5,  5,  6,  6,  6,  6,

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

  101.      8,  8,  8,  8,  8,  8,  8,  8,

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

  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.     10, 10, 10, 10, 10, 10, 10, 10,

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

  115. };

  116. 

  117. static const uint16_t rv_chrom_code[256] = {

  118.     0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  119.     0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  120.     0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  121.     0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  122.     0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  123.     0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  124.     0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  125.     0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  126.     0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  127.     0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  128.     0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  129.     0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  130.     0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  131.     0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  132.     0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  133.     0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  134.     0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  135.     0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  136.     0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  137.     0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  138.     0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  139.     0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  140.     0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  141.     0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  142.     0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  143.     0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  144.     0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  145.     0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  146.     0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  147.     0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  148.     0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  149.     0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  150. };

  151. 

  152. static const uint8_t rv_chrom_bits[256] = {

  153.     16, 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, 14, 14, 14, 14, 14, 14, 14,

  161.     14, 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, 12, 12, 12, 12, 12, 12, 12,

  165.     12, 10, 10, 10, 10, 10, 10, 10,

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

  167.     10,  8,  8,  8,  8,  8,  8,  8,

  168.      8,  6,  6,  6,  6,  4,  4,  3,

  169.      2,  3,  4,  4,  6,  6,  6,  6,

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

  171.     10, 10, 10, 10, 10, 10, 10, 10,

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

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

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

  185. };

  186. 

  187. static VLC rv_dc_lum, rv_dc_chrom;

  188. 

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

  190. {

  191.     int code;

  192. 

  193.     if (n < 4) {

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

  195.         if (code < 0) {

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

  197.                necessary. The following code would be completely useless

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

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

  200.             if (code == 0x7c) {

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

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

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

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

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

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

  207.                 else

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

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

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

  211.                 code = 1;

  212.             }

  213.         } else {

  214.             code -= 128;

  215.         }

  216.     } else {

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

  218.         /* same remark */

  219.         if (code < 0) {

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

  221.             if (code == 0x1fc) {

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

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

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

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

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

  227.                 code = 1;

  228.             } else {

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

  230.                 return 0xffff;

  231.             }

  232.         } else {

  233.             code -= 128;

  234.         }

  235.     }

  236.     return -code;

  237. }

  238. 

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

  240. static int rv10_decode_picture_header(MpegEncContext *s)

  241. {

  242.     int mb_count, pb_frame, marker, mb_xy;

  243. 

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

  245. 

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

  247.         s->pict_type = AV_PICTURE_TYPE_P;

  248.     else

  249.         s->pict_type = AV_PICTURE_TYPE_I;

  250. 

  251.     if (!marker)

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

  253. 

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

  255. 

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

  257. 

  258.     if (pb_frame) {

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

  260.         return AVERROR_PATCHWELCOME;

  261.     }

  262. 

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

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

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

  266.         return AVERROR_INVALIDDATA;

  267.     }

  268. 

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

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

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

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

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

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

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

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

  277.         }

  278.     }

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

  280.        to display the macroblocks is coded here */

  281. 

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

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

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

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

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

  287.     } else {

  288.         s->mb_x  = 0;

  289.         s->mb_y  = 0;

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

  291.     }

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

  293.     s->f_code = 1;

  294.     s->unrestricted_mv = 1;

  295. 

  296.     return mb_count;

  297. }

  298. 

  299. static int rv20_decode_picture_header(RVDecContext *rv)

  300. {

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

  302.     int seq, mb_pos, i, ret;

  303.     int rpr_bits;

  304. 

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

  306.     switch(i) {

  307.     case 0: s->pict_type = AV_PICTURE_TYPE_I; break;

  308.     case 1: s->pict_type = AV_PICTURE_TYPE_I; break; //hmm ...

  309.     case 2: s->pict_type = AV_PICTURE_TYPE_P; break;

  310.     case 3: s->pict_type = AV_PICTURE_TYPE_B; break;

  311.     default:

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

  313.         return AVERROR_INVALIDDATA;

  314.     }

  315. 

  316.     if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {

  317.         av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");

  318.         return -1;

  319.     }

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

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

  322.         return AVERROR_INVALIDDATA;

  323.     }

  324. 

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

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

  327.         return AVERROR_INVALIDDATA;

  328.     }

  329. 

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

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

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

  333.         return AVERROR_INVALIDDATA;

  334.     }

  335. 

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

  337.         s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;

  338. 

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

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

  341.     else

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

  343. 

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

  345.     if (rpr_bits) {

  346.         int f, new_w, new_h;

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

  348. 

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

  350. 

  351.         if (f) {

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

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

  354.                 return AVERROR_INVALIDDATA;

  355.             }

  356. 

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

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

  359.         } else {

  360.             new_w = s->orig_width ;

  361.             new_h = s->orig_height;

  362.         }

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

  364.             AVRational old_aspect = s->avctx->sample_aspect_ratio;

  365.             av_log(s->avctx, AV_LOG_DEBUG,

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

  367.             ff_MPV_common_end(s);

  368. 

  369.             // attempt to keep aspect during typical resolution switches

  370.             if (!old_aspect.num)

  371.                 old_aspect = (AVRational){1, 1};

  372.             if (2 * new_w * s->height == new_h * s->width)

  373.                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});

  374.             if (new_w * s->height == 2 * new_h * s->width)

  375.                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});

  376. 

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

  378.             if (ret < 0)

  379.                 return ret;

  380. 

  381.             s->width  = new_w;

  382.             s->height = new_h;

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

  384.                 return ret;

  385.         }

  386. 

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

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

  389.         }

  390.     }

  391.     if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)

  392.         return AVERROR_INVALIDDATA;

  393. 

  394.     mb_pos = ff_h263_decode_mba(s);

  395. 

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

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

  398.         seq -= 0x8000;

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

  400.         seq += 0x8000;

  401. 

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

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

  404.             s->time            = seq;

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

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

  407.         } else {

  408.             s->time    = seq;

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

  410.         }

  411.     }

  412.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  413.         if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {

  414.             av_log(s->avctx, AV_LOG_DEBUG,

  415.                    "messed up order, possible from seeking? skipping current b frame\n");

  416. #define ERROR_SKIP_FRAME -123

  417.             return ERROR_SKIP_FRAME;

  418.         }

  419.         ff_mpeg4_init_direct_mv(s);

  420.     }

  421. 

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

  423. 

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

  425.         skip_bits(&s->gb, 5); // binary decoder reads 3+2 bits here but they don't seem to be used

  426. 

  427.     s->f_code          = 1;

  428.     s->unrestricted_mv = 1;

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

  430.     s->modified_quant  = 1;

  431.     if (!s->avctx->lowres)

  432.         s->loop_filter = 1;

  433. 

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

  435.         av_log(s->avctx, AV_LOG_INFO, "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",

  436.                seq, s->mb_x, s->mb_y, s->pict_type, s->qscale, s->no_rounding);

  437.     }

  438. 

  439.     av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);

  440. 

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

  442. }

  443. 

  444. static av_cold int rv10_decode_init(AVCodecContext *avctx)

  445. {

  446.     RVDecContext  *rv = avctx->priv_data;

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

  448.     static int done = 0;

  449.     int major_ver, minor_ver, micro_ver, ret;

  450. 

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

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

  453.         return AVERROR_INVALIDDATA;

  454.     }

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

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

  457.         return ret;

  458. 

  459.     ff_MPV_decode_defaults(s);

  460. 

  461.     s->avctx      = avctx;

  462.     s->out_format = FMT_H263;

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

  464. 

  465.     s->orig_width  = s->width  = avctx->coded_width;

  466.     s->orig_height = s->height = avctx->coded_height;

  467. 

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

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

  470. 

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

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

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

  474. 

  475.     s->low_delay = 1;

  476.     switch (major_ver) {

  477.     case 1:

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

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

  480.         break;

  481.     case 2:

  482.         if (minor_ver >= 2) {

  483.             s->low_delay           = 0;

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

  485.         }

  486.         break;

  487.     default:

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

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

  490.         return AVERROR_PATCHWELCOME;

  491.     }

  492. 

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

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

  495.                ((uint32_t*)avctx->extradata)[0]);

  496.     }

  497. 

  498.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  499. 

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

  501.         return ret;

  502. 

  503.     ff_h263dsp_init(&s->h263dsp);

  504.     ff_h263_decode_init_vlc();

  505. 

  506.     /* init rv vlc */

  507.     if (!done) {

  508.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,

  509.                         rv_lum_bits, 1, 1,

  510.                         rv_lum_code, 2, 2, 16384);

  511.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,

  512.                         rv_chrom_bits, 1, 1,

  513.                         rv_chrom_code, 2, 2, 16388);

  514.         done = 1;

  515.     }

  516. 

  517.     return 0;

  518. }

  519. 

  520. static av_cold int rv10_decode_end(AVCodecContext *avctx)

  521. {

  522.     MpegEncContext *s = avctx->priv_data;

  523. 

  524.     ff_MPV_common_end(s);

  525.     return 0;

  526. }

  527. 

  528. static int rv10_decode_packet(AVCodecContext *avctx,

  529.                               const uint8_t *buf, int buf_size, int buf_size2)

  530. {

  531.     RVDecContext  *rv = avctx->priv_data;

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

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

  534. 

  535.     active_bits_size = buf_size * 8;

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

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

  538.         mb_count = rv10_decode_picture_header(s);

  539.     else

  540.         mb_count = rv20_decode_picture_header(rv);

  541.     if (mb_count < 0) {

  542.         if (mb_count != ERROR_SKIP_FRAME)

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

  544.         return AVERROR_INVALIDDATA;

  545.     }

  546. 

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

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

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

  550.         return AVERROR_INVALIDDATA;

  551.     }

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

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

  554.     if (mb_count > left) {

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

  556.         return AVERROR_INVALIDDATA;

  557.     }

  558. 

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

  560.         if (s->current_picture_ptr) { // FIXME write parser so we always have complete frames?

  561.             ff_er_frame_end(&s->er);

  562.             ff_MPV_frame_end(s);

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

  564.         }

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

  566.             return ret;

  567.         ff_mpeg_er_frame_start(s);

  568.     } else {

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

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

  571.             return AVERROR_INVALIDDATA;

  572.         }

  573.     }

  574. 

  575. 

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

  577. 

  578.     /* default quantization values */

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

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

  581.             s->first_slice_line = 1;

  582.     } else {

  583.         s->first_slice_line = 1;

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

  585.     }

  586.     start_mb_x     = s->mb_x;

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

  588.     if (s->h263_aic) {

  589.         s->y_dc_scale_table = s->c_dc_scale_table = ff_aic_dc_scale_table;

  590.     } else {

  591.         s->y_dc_scale_table = 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, 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,

  675.                              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.     s->flags  = avctx->flags;

  688.     s->flags2 = avctx->flags2;

  689. 

  690.     /* no supplementary picture */

  691.     if (buf_size == 0) {

  692.         return 0;

  693.     }

  694. 

  695.     if (!avctx->slice_count) {

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

  697.         buf_size--;

  698. 

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

  700.             av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n", slice_count);

  701.             return AVERROR_INVALIDDATA;

  702.         }

  703. 

  704.         slices_hdr = buf + 4;

  705.         buf       += 8 * slice_count;

  706.         buf_size  -= 8 * slice_count;

  707.     } else

  708.         slice_count = avctx->slice_count;

  709. 

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

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

  712.         int size, size2;

  713. 

  714.         if (offset >= buf_size)

  715.             return AVERROR_INVALIDDATA;

  716. 

  717.         if (i + 1 == slice_count)

  718.             size = buf_size - offset;

  719.         else

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

  721. 

  722.         if (i + 2 >= slice_count)

  723.             size2 = buf_size - offset;

  724.         else

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

  726. 

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

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

  729.             return AVERROR_INVALIDDATA;

  730. 

  731.         if (rv10_decode_packet(avctx, buf + offset, size, size2) > 8 * size)

  732.             i++;

  733.     }

  734. 

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

  736.         ff_er_frame_end(&s->er);

  737.         ff_MPV_frame_end(s);

  738. 

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

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

  741.                 return ret;

  742.             ff_print_debug_info(s, s->current_picture_ptr, pict);

  743.             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);

  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, pict);

  748.             ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);

  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.     .max_lowres     = 3,

  773.     .pix_fmts       = ff_pixfmt_list_420,

  774. };

  775. 

  776. AVCodec ff_rv20_decoder = {

  777.     .name           = "rv20",

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

  779.     .type           = AVMEDIA_TYPE_VIDEO,

  780.     .id             = AV_CODEC_ID_RV20,

  781.     .priv_data_size = sizeof(RVDecContext),

  782.     .init           = rv10_decode_init,

  783.     .close          = rv10_decode_end,

  784.     .decode         = rv10_decode_frame,

  785.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  786.     .flush          = ff_mpeg_flush,

  787.     .max_lowres     = 3,

  788.     .pix_fmts       = ff_pixfmt_list_420,

  789. };