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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 "avcodec.h"

  29. #include "dsputil.h"

  30. #include "mpegvideo.h"

  31. #include "mpeg4video.h"

  32. #include "h263.h"

  33. 

  34. //#define DEBUG

  35. 

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

  37. 

  38. static const uint16_t rv_lum_code[256] =

  39. {

  40.  0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  41.  0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  42.  0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  43.  0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  44.  0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  45.  0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  46.  0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  47.  0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  48.  0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  49.  0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  50.  0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  51.  0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  52.  0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  53.  0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  54.  0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  55.  0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  56.  0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  57.  0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  58.  0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  59.  0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  60.  0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  61.  0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  62.  0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  63.  0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  64.  0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  65.  0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  66.  0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  67.  0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  68.  0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  69.  0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  70.  0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  71.  0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  72. };

  73. 

  74. static const uint8_t rv_lum_bits[256] =

  75. {

  76.  14, 12, 12, 12, 12, 12, 12, 12,

  77.  12, 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, 10, 10, 10, 10, 10, 10, 10,

  85.  10, 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,  8,  8,  8,  8,  8,  8,  8,

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

  90.   8,  7,  7,  7,  7,  7,  7,  7,

  91.   7,  6,  6,  6,  6,  5,  5,  4,

  92.   2,  4,  5,  5,  6,  6,  6,  6,

  93.   7,  7,  7,  7,  7,  7,  7,  7,

  94.   8,  8,  8,  8,  8,  8,  8,  8,

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

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

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

  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. };

  109. 

  110. static const uint16_t rv_chrom_code[256] =

  111. {

  112.  0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  113.  0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  114.  0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  115.  0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  116.  0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  117.  0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  118.  0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  119.  0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  120.  0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  121.  0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  122.  0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  123.  0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  124.  0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  125.  0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  126.  0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  127.  0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  128.  0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  129.  0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  130.  0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  131.  0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  132.  0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  133.  0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  134.  0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  135.  0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  136.  0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  137.  0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  138.  0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  139.  0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  140.  0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  141.  0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  142.  0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  143.  0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  144. };

  145. 

  146. static const uint8_t rv_chrom_bits[256] =

  147. {

  148.  16, 14, 14, 14, 14, 14, 14, 14,

  149.  14, 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, 12, 12, 12, 12, 12, 12, 12,

  157.  12, 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, 10, 10, 10, 10, 10, 10, 10,

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

  162.  10,  8,  8,  8,  8,  8,  8,  8,

  163.   8,  6,  6,  6,  6,  4,  4,  3,

  164.   2,  3,  4,  4,  6,  6,  6,  6,

  165.   8,  8,  8,  8,  8,  8,  8,  8,

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

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

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

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

  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. };

  181. 

  182. static VLC rv_dc_lum, rv_dc_chrom;

  183. 

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

  185. {

  186.     int code;

  187. 

  188.     if (n < 4) {

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

  190.         if (code < 0) {

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

  192.                necessary. The following code would be completely useless

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

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

  195.             if (code == 0x7c) {

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

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

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

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

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

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

  202.                 else

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

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

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

  206.                 code = 1;

  207.             }

  208.         } else {

  209.             code -= 128;

  210.         }

  211.     } else {

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

  213.         /* same remark */

  214.         if (code < 0) {

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

  216.             if (code == 0x1fc) {

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

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

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

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

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

  222.                 code = 1;

  223.             } else {

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

  225.                 return 0xffff;

  226.             }

  227.         } else {

  228.             code -= 128;

  229.         }

  230.     }

  231.     return -code;

  232. }

  233. 

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

  235. static int rv10_decode_picture_header(MpegEncContext *s)

  236. {

  237.     int mb_count, pb_frame, marker, unk, mb_xy;

  238. 

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

  240. 

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

  242.         s->pict_type = FF_P_TYPE;

  243.     else

  244.         s->pict_type = FF_I_TYPE;

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

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

  247. 

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

  249. 

  250.     if (pb_frame){

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

  252.         return -1;

  253.     }

  254. 

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

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

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

  258.         return -1;

  259.     }

  260. 

  261.     if (s->pict_type == FF_I_TYPE) {

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

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

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

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

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

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

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

  269.         }

  270.     }

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

  272.        to display the macroblocks is coded here */

  273. 

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

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

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

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

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

  279.     } else {

  280.         s->mb_x = 0;

  281.         s->mb_y = 0;

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

  283.     }

  284.     unk= get_bits(&s->gb, 3);   /* ignored */

  285.     s->f_code = 1;

  286.     s->unrestricted_mv = 1;

  287. 

  288.     return mb_count;

  289. }

  290. 

  291. static int rv20_decode_picture_header(MpegEncContext *s)

  292. {

  293.     int seq, mb_pos, i;

  294. 

  295. #if 0

  296.     GetBitContext gb= s->gb;

  297.     for(i=0; i<64; i++){

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

  299.         if(i%4==3) av_log(s->avctx, AV_LOG_DEBUG, " ");

  300.     }

  301.     av_log(s->avctx, AV_LOG_DEBUG, "\n");

  302. #endif

  303. #if 0

  304.     av_log(s->avctx, AV_LOG_DEBUG, "%3dx%03d/%02Xx%02X ", s->width, s->height, s->width/4, s->height/4);

  305.     for(i=0; i<s->avctx->extradata_size; i++){

  306.         av_log(s->avctx, AV_LOG_DEBUG, "%02X ", ((uint8_t*)s->avctx->extradata)[i]);

  307.         if(i%4==3) av_log(s->avctx, AV_LOG_DEBUG, " ");

  308.     }

  309.     av_log(s->avctx, AV_LOG_DEBUG, "\n");

  310. #endif

  311. 

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

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

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

  315.             return -1;

  316.         }

  317.     }

  318. 

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

  320.     switch(i){

  321.     case 0: s->pict_type= FF_I_TYPE; break;

  322.     case 1: s->pict_type= FF_I_TYPE; break; //hmm ...

  323.     case 2: s->pict_type= FF_P_TYPE; break;

  324.     case 3: s->pict_type= FF_B_TYPE; break;

  325.     default:

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

  327.         return -1;

  328.     }

  329. 

  330.     if(s->last_picture_ptr==NULL && s->pict_type==FF_B_TYPE){

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

  332.         return -1;

  333.     }

  334. 

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

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

  337.         return -1;

  338.     }

  339. 

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

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

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

  343.         return -1;

  344.     }

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

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

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

  348.             return -1;

  349.         }

  350.     }

  351. 

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

  353.         int f, new_w, new_h;

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

  355. 

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

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

  358.         }

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

  360. 

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

  362. 

  363.         if(f){

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

  372.             if (avcodec_check_dimensions(s->avctx, new_w, new_h) < 0)

  373.                 return -1;

  374.             MPV_common_end(s);

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

  376.             s->width  = new_w;

  377.             s->height = new_h;

  378.             if (MPV_common_init(s) < 0)

  379.                 return -1;

  380.         }

  381. 

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

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

  384.         }

  385.     }else{

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

  387.     }

  388. 

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

  390.     mb_pos= ff_h263_decode_mba(s);

  391. /*    }else{

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

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

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

  395.     }*/

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

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

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

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

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

  401.         if(s->pict_type!=FF_B_TYPE){

  402.             s->time= seq;

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

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

  405.         }else{

  406.             s->time= seq;

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

  408.             if(s->pp_time <=s->pb_time || 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 from seeking? skipping current b frame\n");

  410.                 return FRAME_SKIPPED;

  411.             }

  412.             ff_mpeg4_init_direct_mv(s);

  413.         }

  414.     }

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

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

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

  418. }

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

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

  421. 

  422.     s->f_code = 1;

  423.     s->unrestricted_mv = 1;

  424.     s->h263_aic= s->pict_type == FF_I_TYPE;

  425. //    s->alt_inter_vlc=1;

  426. //    s->obmc=1;

  427. //    s->umvplus=1;

  428.     s->modified_quant=1;

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

  430.         s->loop_filter=1;

  431. 

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

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

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

  435.     }

  436. 

  437.     assert(s->pict_type != FF_B_TYPE || !s->low_delay);

  438. 

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

  440. }

  441. 

  442. static av_cold int rv10_decode_init(AVCodecContext *avctx)

  443. {

  444.     MpegEncContext *s = avctx->priv_data;

  445.     static int done=0;

  446. 

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

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

  449.         return -1;

  450.     }

  451. 

  452.     MPV_decode_defaults(s);

  453. 

  454.     s->avctx= avctx;

  455.     s->out_format = FMT_H263;

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

  457. 

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

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

  460. 

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

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

  463. 

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

  465.         s->rv10_version= 0;

  466.         s->low_delay=1;

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

  468.         s->rv10_version= 3;

  469.         s->low_delay=1;

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

  471.         s->rv10_version= 3;

  472.         s->low_delay=1;

  473.         s->obmc=1;

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

  475.         s->rv10_version= 3;

  476.         s->low_delay=1;

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

  478.         s->rv10_version= 3;

  479.         s->low_delay=1;

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

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

  482.         s->low_delay=1;

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

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

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

  486.         s->low_delay=0;

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

  488.     } else

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

  490. 

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

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

  493.     }

  494. 

  495.     avctx->pix_fmt = PIX_FMT_YUV420P;

  496. 

  497.     if (MPV_common_init(s) < 0)

  498.         return -1;

  499. 

  500.     h263_decode_init_vlc(s);

  501. 

  502.     /* init rv vlc */

  503.     if (!done) {

  504.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,

  505.                  rv_lum_bits, 1, 1,

  506.                  rv_lum_code, 2, 2, 16384);

  507.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,

  508.                  rv_chrom_bits, 1, 1,

  509.                  rv_chrom_code, 2, 2, 16388);

  510.         done = 1;

  511.     }

  512. 

  513.     return 0;

  514. }

  515. 

  516. static av_cold int rv10_decode_end(AVCodecContext *avctx)

  517. {

  518.     MpegEncContext *s = avctx->priv_data;

  519. 

  520.     MPV_common_end(s);

  521.     return 0;

  522. }

  523. 

  524. static int rv10_decode_packet(AVCodecContext *avctx,

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

  526. {

  527.     MpegEncContext *s = avctx->priv_data;

  528.     int mb_count, mb_pos, left, start_mb_x;

  529. 

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

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

  532.         mb_count = rv10_decode_picture_header(s);

  533.     else

  534.         mb_count = rv20_decode_picture_header(s);

  535.     if (mb_count < 0) {

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

  537.         return -1;

  538.     }

  539. 

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

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

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

  543.         return -1;

  544.     }

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

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

  547.     if (mb_count > left) {

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

  549.         return -1;

  550.     }

  551. 

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

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

  554.             ff_er_frame_end(s);

  555.             MPV_frame_end(s);

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

  557.         }

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

  559.             return -1;

  560.         ff_er_frame_start(s);

  561.     }

  562. 

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

  564. 

  565.     /* default quantization values */

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

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

  568.     }else{

  569.         s->first_slice_line=1;

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

  571.     }

  572.     start_mb_x= s->mb_x;

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

  574.     if(s->h263_aic){

  575.         s->y_dc_scale_table=

  576.         s->c_dc_scale_table= ff_aic_dc_scale_table;

  577.     }else{

  578.         s->y_dc_scale_table=

  579.         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;

  580.     }

  581. 

  582.     if(s->modified_quant)

  583.         s->chroma_qscale_table= ff_h263_chroma_qscale_table;

  584. 

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

  586. 

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

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

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

  590.     s->block_wrap[0]=

  591.     s->block_wrap[1]=

  592.     s->block_wrap[2]=

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

  594.     s->block_wrap[4]=

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

  596.     ff_init_block_index(s);

  597.     /* decode each macroblock */

  598. 

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

  600.         int ret;

  601.         ff_update_block_index(s);

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

  603. 

  604.         s->mv_dir = MV_DIR_FORWARD;

  605.         s->mv_type = MV_TYPE_16X16;

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

  607. 

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

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

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

  611.             ret= SLICE_OK;

  612.         }

  613. 

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

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

  616.             return -1;

  617.         }

  618.         if(s->pict_type != FF_B_TYPE)

  619.             ff_h263_update_motion_val(s);

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

  621.         if(s->loop_filter)

  622.             ff_h263_loop_filter(s);

  623. 

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

  625.             s->mb_x = 0;

  626.             s->mb_y++;

  627.             ff_init_block_index(s);

  628.         }

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

  630.             s->first_slice_line=0;

  631.         if(ret == SLICE_END) break;

  632.     }

  633. 

  634.     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);

  635. 

  636.     return s->gb.size_in_bits;

  637. }

  638. 

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

  640. {

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

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

  643. }

  644. 

  645. static int rv10_decode_frame(AVCodecContext *avctx,

  646.                              void *data, int *data_size,

  647.                              AVPacket *avpkt)

  648. {

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

  650.     int buf_size = avpkt->size;

  651.     MpegEncContext *s = avctx->priv_data;

  652.     int i;

  653.     AVFrame *pict = data;

  654.     int slice_count;

  655.     const uint8_t *slices_hdr = NULL;

  656. 

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

  658. 

  659.     /* no supplementary picture */

  660.     if (buf_size == 0) {

  661.         return 0;

  662.     }

  663. 

  664.     if(!avctx->slice_count){

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

  666.         slices_hdr = buf + 4;

  667.         buf += 8 * slice_count;

  668.     }else

  669.         slice_count = avctx->slice_count;

  670. 

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

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

  673.         int size, size2;

  674. 

  675.         if(i+1 == slice_count)

  676.             size= buf_size - offset;

  677.         else

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

  679. 

  680.         if(i+2 >= slice_count)

  681.             size2= buf_size - offset;

  682.         else

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

  684. 

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

  686.             i++;

  687.     }

  688. 

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

  690.         ff_er_frame_end(s);

  691.         MPV_frame_end(s);

  692. 

  693.         if (s->pict_type == FF_B_TYPE || s->low_delay) {

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

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

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

  697.         }

  698. 

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

  700.             *data_size = sizeof(AVFrame);

  701.             ff_print_debug_info(s, pict);

  702.         }

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

  704.     }

  705. 

  706.     return buf_size;

  707. }

  708. 

  709. AVCodec rv10_decoder = {

  710.     "rv10",

  711.     AVMEDIA_TYPE_VIDEO,

  712.     CODEC_ID_RV10,

  713.     sizeof(MpegEncContext),

  714.     rv10_decode_init,

  715.     NULL,

  716.     rv10_decode_end,

  717.     rv10_decode_frame,

  718.     CODEC_CAP_DR1,

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

  720.     .pix_fmts= ff_pixfmt_list_420,

  721. };

  722. 

  723. AVCodec rv20_decoder = {

  724.     "rv20",

  725.     AVMEDIA_TYPE_VIDEO,

  726.     CODEC_ID_RV20,

  727.     sizeof(MpegEncContext),

  728.     rv10_decode_init,

  729.     NULL,

  730.     rv10_decode_end,

  731.     rv10_decode_frame,

  732.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  733.     .flush= ff_mpeg_flush,

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

  735.     .pix_fmts= ff_pixfmt_list_420,

  736. };