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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. #include "avcodec.h"

  30. #include "dsputil.h"

  31. #include "mpegvideo.h"

  32. #include "mpeg4video.h"

  33. #include "h263.h"

  34. 

  35. //#define DEBUG

  36. 

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

  38. 

  39. static const uint16_t rv_lum_code[256] =

  40. {

  41.  0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  42.  0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  43.  0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  44.  0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  45.  0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  46.  0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  47.  0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  48.  0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  49.  0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  50.  0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  51.  0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  52.  0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  53.  0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  54.  0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  55.  0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  56.  0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  57.  0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  58.  0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  59.  0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  60.  0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  61.  0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  62.  0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  63.  0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  64.  0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  65.  0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  66.  0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  67.  0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  68.  0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  69.  0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  70.  0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  71.  0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  72.  0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  73. };

  74. 

  75. static const uint8_t rv_lum_bits[256] =

  76. {

  77.  14, 12, 12, 12, 12, 12, 12, 12,

  78.  12, 12, 12, 12, 12, 12, 12, 12,

  79.  12, 12, 12, 12, 12, 12, 12, 12,

  80.  12, 12, 12, 12, 12, 12, 12, 12,

  81.  12, 12, 12, 12, 12, 12, 12, 12,

  82.  12, 12, 12, 12, 12, 12, 12, 12,

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

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

  85.  12, 10, 10, 10, 10, 10, 10, 10,

  86.  10, 10, 10, 10, 10, 10, 10, 10,

  87.  10, 10, 10, 10, 10, 10, 10, 10,

  88.  10, 10, 10, 10, 10, 10, 10, 10,

  89.  10,  8,  8,  8,  8,  8,  8,  8,

  90.   8,  8,  8,  8,  8,  8,  8,  8,

  91.   8,  7,  7,  7,  7,  7,  7,  7,

  92.   7,  6,  6,  6,  6,  5,  5,  4,

  93.   2,  4,  5,  5,  6,  6,  6,  6,

  94.   7,  7,  7,  7,  7,  7,  7,  7,

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

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

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

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

  99.  10, 10, 10, 10, 10, 10, 10, 10,

  100.  10, 10, 10, 10, 10, 10, 10, 10,

  101.  12, 12, 12, 12, 12, 12, 12, 12,

  102.  12, 12, 12, 12, 12, 12, 12, 12,

  103.  12, 12, 12, 12, 12, 12, 12, 12,

  104.  12, 12, 12, 12, 12, 12, 12, 12,

  105.  12, 12, 12, 12, 12, 12, 12, 12,

  106.  12, 12, 12, 12, 12, 12, 12, 12,

  107.  12, 12, 12, 12, 12, 12, 12, 12,

  108.  12, 12, 12, 12, 12, 12, 12, 12,

  109. };

  110. 

  111. static const uint16_t rv_chrom_code[256] =

  112. {

  113.  0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  114.  0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  115.  0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  116.  0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  117.  0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  118.  0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  119.  0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  120.  0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  121.  0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  122.  0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  123.  0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  124.  0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  125.  0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  126.  0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  127.  0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  128.  0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  129.  0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  130.  0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  131.  0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  132.  0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  133.  0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  134.  0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  135.  0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  136.  0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  137.  0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  138.  0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  139.  0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  140.  0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  141.  0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  142.  0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  143.  0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  144.  0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  145. };

  146. 

  147. static const uint8_t rv_chrom_bits[256] =

  148. {

  149.  16, 14, 14, 14, 14, 14, 14, 14,

  150.  14, 14, 14, 14, 14, 14, 14, 14,

  151.  14, 14, 14, 14, 14, 14, 14, 14,

  152.  14, 14, 14, 14, 14, 14, 14, 14,

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

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

  155.  14, 14, 14, 14, 14, 14, 14, 14,

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

  157.  14, 12, 12, 12, 12, 12, 12, 12,

  158.  12, 12, 12, 12, 12, 12, 12, 12,

  159.  12, 12, 12, 12, 12, 12, 12, 12,

  160.  12, 12, 12, 12, 12, 12, 12, 12,

  161.  12, 10, 10, 10, 10, 10, 10, 10,

  162.  10, 10, 10, 10, 10, 10, 10, 10,

  163.  10,  8,  8,  8,  8,  8,  8,  8,

  164.   8,  6,  6,  6,  6,  4,  4,  3,

  165.   2,  3,  4,  4,  6,  6,  6,  6,

  166.   8,  8,  8,  8,  8,  8,  8,  8,

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

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

  169.  12, 12, 12, 12, 12, 12, 12, 12,

  170.  12, 12, 12, 12, 12, 12, 12, 12,

  171.  12, 12, 12, 12, 12, 12, 12, 12,

  172.  12, 12, 12, 12, 12, 12, 12, 12,

  173.  14, 14, 14, 14, 14, 14, 14, 14,

  174.  14, 14, 14, 14, 14, 14, 14, 14,

  175.  14, 14, 14, 14, 14, 14, 14, 14,

  176.  14, 14, 14, 14, 14, 14, 14, 14,

  177.  14, 14, 14, 14, 14, 14, 14, 14,

  178.  14, 14, 14, 14, 14, 14, 14, 14,

  179.  14, 14, 14, 14, 14, 14, 14, 14,

  180.  14, 14, 14, 14, 14, 14, 14, 14,

  181. };

  182. 

  183. static VLC rv_dc_lum, rv_dc_chrom;

  184. 

  185. int rv_decode_dc(MpegEncContext *s, int n)

  186. {

  187.     int code;

  188. 

  189.     if (n < 4) {

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

  191.         if (code < 0) {

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

  193.                necessary. The following code would be completely useless

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

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

  196.             if (code == 0x7c) {

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

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

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

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

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

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

  203.                 else

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

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

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

  207.                 code = 1;

  208.             }

  209.         } else {

  210.             code -= 128;

  211.         }

  212.     } else {

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

  214.         /* same remark */

  215.         if (code < 0) {

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

  217.             if (code == 0x1fc) {

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

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

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

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

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

  223.                 code = 1;

  224.             } else {

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

  226.                 return 0xffff;

  227.             }

  228.         } else {

  229.             code -= 128;

  230.         }

  231.     }

  232.     return -code;

  233. }

  234. 

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

  236. static int rv10_decode_picture_header(MpegEncContext *s)

  237. {

  238.     int mb_count, pb_frame, marker, mb_xy;

  239. 

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

  241. 

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

  243.         s->pict_type = AV_PICTURE_TYPE_P;

  244.     else

  245.         s->pict_type = AV_PICTURE_TYPE_I;

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

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

  248. 

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

  250. 

  251.     if (pb_frame){

  252.         av_log(s->avctx, AV_LOG_ERROR, "pb frame not supported\n");

  253.         return -1;

  254.     }

  255. 

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

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

  258.         av_log(s->avctx, AV_LOG_ERROR, "error, qscale:0\n");

  259.         return -1;

  260.     }

  261. 

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

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

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

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

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

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

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

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

  270.         }

  271.     }

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

  273.        to display the macroblocks is coded here */

  274. 

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

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

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

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

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

  280.     } else {

  281.         s->mb_x = 0;

  282.         s->mb_y = 0;

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

  284.     }

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

  286.     s->f_code = 1;

  287.     s->unrestricted_mv = 1;

  288. 

  289.     return mb_count;

  290. }

  291. 

  292. static int rv20_decode_picture_header(MpegEncContext *s)

  293. {

  294.     int seq, mb_pos, i;

  295. 

  296.     if(s->avctx->sub_id == 0x30202002 || s->avctx->sub_id == 0x30203002){

  297.         if (get_bits(&s->gb, 3)){

  298.             av_log(s->avctx, AV_LOG_ERROR, "unknown triplet set\n");

  299.             return -1;

  300.         }

  301.     }

  302. 

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

  304.     switch(i){

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

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

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

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

  309.     default:

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

  311.         return -1;

  312.     }

  313. 

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

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

  316.         return -1;

  317.     }

  318. 

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

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

  321.         return -1;

  322.     }

  323. 

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

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

  326.         av_log(s->avctx, AV_LOG_ERROR, "error, qscale:0\n");

  327.         return -1;

  328.     }

  329.     if(s->avctx->sub_id == 0x30203002){

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

  331.             av_log(s->avctx, AV_LOG_ERROR, "unknown bit2 set\n");

  332.             return -1;

  333.         }

  334.     }

  335. 

  336.     if(s->avctx->has_b_frames){

  337.         int f, new_w, new_h;

  338.         int v= s->avctx->extradata_size >= 4 ? 7&((uint8_t*)s->avctx->extradata)[1] : 0;

  339. 

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

  341.             av_log(s->avctx, AV_LOG_ERROR, "unknown bit3 set\n");

  342.         }

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

  344. 

  345.         f= get_bits(&s->gb, av_log2(v)+1);

  346. 

  347.         if(f){

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

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

  350.         }else{

  351.             new_w= s->orig_width ;

  352.             new_h= s->orig_height;

  353.         }

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

  355.             av_log(s->avctx, AV_LOG_DEBUG, "attempting to change resolution to %dx%d\n", new_w, new_h);

  356.             if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)

  357.                 return -1;

  358.             MPV_common_end(s);

  359.             avcodec_set_dimensions(s->avctx, new_w, new_h);

  360.             s->width  = new_w;

  361.             s->height = new_h;

  362.             if (MPV_common_init(s) < 0)

  363.                 return -1;

  364.         }

  365. 

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

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

  368.         }

  369.     }else{

  370.         seq= get_bits(&s->gb, 8)*128;

  371.     }

  372. 

  373. //     if(s->avctx->sub_id <= 0x20201002){ //0x20201002 definitely needs this

  374.     mb_pos= ff_h263_decode_mba(s);

  375. /*    }else{

  376.         mb_pos= get_bits(&s->gb, av_log2(s->mb_num-1)+1);

  377.         s->mb_x= mb_pos % s->mb_width;

  378.         s->mb_y= mb_pos / s->mb_width;

  379.     }*/

  380. //av_log(s->avctx, AV_LOG_DEBUG, "%d\n", seq);

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

  382.     if(seq - s->time >  0x4000) seq -= 0x8000;

  383.     if(seq - s->time < -0x4000) seq += 0x8000;

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

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

  386.             s->time= seq;

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

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

  389.         }else{

  390.             s->time= seq;

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

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

  393.                 av_log(s->avctx, AV_LOG_DEBUG, "messed up order, possible from seeking? skipping current b frame\n");

  394.                 return FRAME_SKIPPED;

  395.             }

  396.             ff_mpeg4_init_direct_mv(s);

  397.         }

  398.     }

  399. //    printf("%d %d %d %d %d\n", seq, (int)s->time, (int)s->last_non_b_time, s->pp_time, s->pb_time);

  400. /*for(i=0; i<32; i++){

  401.     av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));

  402. }

  403. av_log(s->avctx, AV_LOG_DEBUG, "\n");*/

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

  405. 

  406.     s->f_code = 1;

  407.     s->unrestricted_mv = 1;

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

  409. //    s->alt_inter_vlc=1;

  410. //    s->obmc=1;

  411. //    s->umvplus=1;

  412.     s->modified_quant=1;

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

  414.         s->loop_filter=1;

  415. 

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

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

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

  419.     }

  420. 

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

  422. 

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

  424. }

  425. 

  426. static av_cold int rv10_decode_init(AVCodecContext *avctx)

  427. {

  428.     MpegEncContext *s = avctx->priv_data;

  429.     static int done=0;

  430. 

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

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

  433.         return -1;

  434.     }

  435. 

  436.     MPV_decode_defaults(s);

  437. 

  438.     s->avctx= avctx;

  439.     s->out_format = FMT_H263;

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

  441.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  442. 

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

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

  445. 

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

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

  448. 

  449.     if (avctx->sub_id == 0x10000000) {

  450.         s->rv10_version= 0;

  451.         s->low_delay=1;

  452.     } else if (avctx->sub_id == 0x10001000) {

  453.         s->rv10_version= 3;

  454.         s->low_delay=1;

  455.     } else if (avctx->sub_id == 0x10002000) {

  456.         s->rv10_version= 3;

  457.         s->low_delay=1;

  458.         s->obmc=1;

  459.     } else if (avctx->sub_id == 0x10003000) {

  460.         s->rv10_version= 3;

  461.         s->low_delay=1;

  462.     } else if (avctx->sub_id == 0x10003001) {

  463.         s->rv10_version= 3;

  464.         s->low_delay=1;

  465.     } else if (    avctx->sub_id == 0x20001000

  466.                || (avctx->sub_id >= 0x20100000 && avctx->sub_id < 0x201a0000)) {

  467.         s->low_delay=1;

  468.     } else if (    avctx->sub_id == 0x30202002

  469.                ||  avctx->sub_id == 0x30203002

  470.                || (avctx->sub_id >= 0x20200002 && avctx->sub_id < 0x20300000)) {

  471.         s->low_delay=0;

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

  473.     } else

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

  475. 

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

  477.         av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%X\n", avctx->sub_id, avctx->extradata_size >= 4 ? ((uint32_t*)avctx->extradata)[0] : -1);

  478.     }

  479. 

  480.     avctx->pix_fmt = PIX_FMT_YUV420P;

  481. 

  482.     if (MPV_common_init(s) < 0)

  483.         return -1;

  484. 

  485.     h263_decode_init_vlc(s);

  486. 

  487.     /* init rv vlc */

  488.     if (!done) {

  489.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,

  490.                  rv_lum_bits, 1, 1,

  491.                  rv_lum_code, 2, 2, 16384);

  492.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,

  493.                  rv_chrom_bits, 1, 1,

  494.                  rv_chrom_code, 2, 2, 16388);

  495.         done = 1;

  496.     }

  497. 

  498.     return 0;

  499. }

  500. 

  501. static av_cold int rv10_decode_end(AVCodecContext *avctx)

  502. {

  503.     MpegEncContext *s = avctx->priv_data;

  504. 

  505.     MPV_common_end(s);

  506.     return 0;

  507. }

  508. 

  509. static int rv10_decode_packet(AVCodecContext *avctx,

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

  511. {

  512.     MpegEncContext *s = avctx->priv_data;

  513.     int mb_count, mb_pos, left, start_mb_x;

  514. 

  515.     init_get_bits(&s->gb, buf, buf_size*8);

  516.     if(s->codec_id ==CODEC_ID_RV10)

  517.         mb_count = rv10_decode_picture_header(s);

  518.     else

  519.         mb_count = rv20_decode_picture_header(s);

  520.     if (mb_count < 0) {

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

  522.         return -1;

  523.     }

  524. 

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

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

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

  528.         return -1;

  529.     }

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

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

  532.     if (mb_count > left) {

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

  534.         return -1;

  535.     }

  536. 

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

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

  539.             ff_er_frame_end(s);

  540.             MPV_frame_end(s);

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

  542.         }

  543.         if(MPV_frame_start(s, avctx) < 0)

  544.             return -1;

  545.         ff_er_frame_start(s);

  546.     } else {

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

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

  549.             return -1;

  550.         }

  551.     }

  552. 

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

  554. 

  555.     /* default quantization values */

  556.     if(s->codec_id== CODEC_ID_RV10){

  557.         if(s->mb_y==0) s->first_slice_line=1;

  558.     }else{

  559.         s->first_slice_line=1;

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

  561.     }

  562.     start_mb_x= s->mb_x;

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

  564.     if(s->h263_aic){

  565.         s->y_dc_scale_table=

  566.         s->c_dc_scale_table= ff_aic_dc_scale_table;

  567.     }else{

  568.         s->y_dc_scale_table=

  569.         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;

  570.     }

  571. 

  572.     if(s->modified_quant)

  573.         s->chroma_qscale_table= ff_h263_chroma_qscale_table;

  574. 

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

  576. 

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

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

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

  580.     s->block_wrap[0]=

  581.     s->block_wrap[1]=

  582.     s->block_wrap[2]=

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

  584.     s->block_wrap[4]=

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

  586.     ff_init_block_index(s);

  587.     /* decode each macroblock */

  588. 

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

  590.         int ret;

  591.         ff_update_block_index(s);

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

  593. 

  594.         s->mv_dir = MV_DIR_FORWARD;

  595.         s->mv_type = MV_TYPE_16X16;

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

  597. 

  598.         if (ret != SLICE_ERROR && s->gb.size_in_bits < get_bits_count(&s->gb) && 8*buf_size2 >= get_bits_count(&s->gb)){

  599.             av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n", s->gb.size_in_bits, 8*buf_size2);

  600.             s->gb.size_in_bits= 8*buf_size2;

  601.             ret= SLICE_OK;

  602.         }

  603. 

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

  605.             av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x, s->mb_y);

  606.             return -1;

  607.         }

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

  609.             ff_h263_update_motion_val(s);

  610.         MPV_decode_mb(s, s->block);

  611.         if(s->loop_filter)

  612.             ff_h263_loop_filter(s);

  613. 

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

  615.             s->mb_x = 0;

  616.             s->mb_y++;

  617.             ff_init_block_index(s);

  618.         }

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

  620.             s->first_slice_line=0;

  621.         if(ret == SLICE_END) break;

  622.     }

  623. 

  624.     ff_er_add_slice(s, start_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);

  625. 

  626.     return s->gb.size_in_bits;

  627. }

  628. 

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

  630. {

  631.     if(avctx->slice_count) return avctx->slice_offset[n];

  632.     else                   return AV_RL32(buf + n*8);

  633. }

  634. 

  635. static int rv10_decode_frame(AVCodecContext *avctx,

  636.                              void *data, int *data_size,

  637.                              AVPacket *avpkt)

  638. {

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

  640.     int buf_size = avpkt->size;

  641.     MpegEncContext *s = avctx->priv_data;

  642.     int i;

  643.     AVFrame *pict = data;

  644.     int slice_count;

  645.     const uint8_t *slices_hdr = NULL;

  646. 

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

  648. 

  649.     /* no supplementary picture */

  650.     if (buf_size == 0) {

  651.         return 0;

  652.     }

  653. 

  654.     if(!avctx->slice_count){

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

  656.         slices_hdr = buf + 4;

  657.         buf += 8 * slice_count;

  658.     }else

  659.         slice_count = avctx->slice_count;

  660. 

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

  662.         int offset= get_slice_offset(avctx, slices_hdr, i);

  663.         int size, size2;

  664. 

  665.         if(i+1 == slice_count)

  666.             size= buf_size - offset;

  667.         else

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

  669. 

  670.         if(i+2 >= slice_count)

  671.             size2= buf_size - offset;

  672.         else

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

  674. 

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

  676.             i++;

  677.     }

  678. 

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

  680.         ff_er_frame_end(s);

  681.         MPV_frame_end(s);

  682. 

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

  684.             *pict= *(AVFrame*)s->current_picture_ptr;

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

  686.             *pict= *(AVFrame*)s->last_picture_ptr;

  687.         }

  688. 

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

  690.             *data_size = sizeof(AVFrame);

  691.             ff_print_debug_info(s, pict);

  692.         }

  693.         s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)

  694.     }

  695. 

  696.     return buf_size;

  697. }

  698. 

  699. AVCodec ff_rv10_decoder = {

  700.     "rv10",

  701.     AVMEDIA_TYPE_VIDEO,

  702.     CODEC_ID_RV10,

  703.     sizeof(MpegEncContext),

  704.     rv10_decode_init,

  705.     NULL,

  706.     rv10_decode_end,

  707.     rv10_decode_frame,

  708.     CODEC_CAP_DR1,

  709.     .max_lowres = 3,

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

  711.     .pix_fmts= ff_pixfmt_list_420,

  712. };

  713. 

  714. AVCodec ff_rv20_decoder = {

  715.     "rv20",

  716.     AVMEDIA_TYPE_VIDEO,

  717.     CODEC_ID_RV20,

  718.     sizeof(MpegEncContext),

  719.     rv10_decode_init,

  720.     NULL,

  721.     rv10_decode_end,

  722.     rv10_decode_frame,

  723.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  724.     .flush= ff_mpeg_flush,

  725.     .max_lowres = 3,

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

  727.     .pix_fmts= ff_pixfmt_list_420,

  728. };