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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 "dsputil.h"

  31. #include "mpegvideo.h"

  32. #include "mpeg4video.h"

  33. #include "h263.h"

  34. 

  35. //#define DEBUG

  36. 

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

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

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

  40. 

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

  42. 

  43. static const uint16_t rv_lum_code[256] =

  44. {

  45.  0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  46.  0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  47.  0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  48.  0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  49.  0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  50.  0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  51.  0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  52.  0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  53.  0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  54.  0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  55.  0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  56.  0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  57.  0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  58.  0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  59.  0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  60.  0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  61.  0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  62.  0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  63.  0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  64.  0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  65.  0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  66.  0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  67.  0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  68.  0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  69.  0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  70.  0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  71.  0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  72.  0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  73.  0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  74.  0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  75.  0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  76.  0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  77. };

  78. 

  79. static const uint8_t rv_lum_bits[256] =

  80. {

  81.  14, 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, 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, 10, 10, 10, 10, 10, 10, 10,

  90.  10, 10, 10, 10, 10, 10, 10, 10,

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

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

  93.  10,  8,  8,  8,  8,  8,  8,  8,

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

  95.   8,  7,  7,  7,  7,  7,  7,  7,

  96.   7,  6,  6,  6,  6,  5,  5,  4,

  97.   2,  4,  5,  5,  6,  6,  6,  6,

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

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

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

  101.  10, 10, 10, 10, 10, 10, 10, 10,

  102.  10, 10, 10, 10, 10, 10, 10, 10,

  103.  10, 10, 10, 10, 10, 10, 10, 10,

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

  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.  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. };

  114. 

  115. static const uint16_t rv_chrom_code[256] =

  116. {

  117.  0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  118.  0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  119.  0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  120.  0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  121.  0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  122.  0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  123.  0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  124.  0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  125.  0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  126.  0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  127.  0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  128.  0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  129.  0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  130.  0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  131.  0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  132.  0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  133.  0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  134.  0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  135.  0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  136.  0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  137.  0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  138.  0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  139.  0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  140.  0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  141.  0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  142.  0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  143.  0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  144.  0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  145.  0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  146.  0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  147.  0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  148.  0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  149. };

  150. 

  151. static const uint8_t rv_chrom_bits[256] =

  152. {

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

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

  252. 

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

  254. 

  255.     if (pb_frame){

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

  257.         return -1;

  258.     }

  259. 

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

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

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

  263.         return -1;

  264.     }

  265. 

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

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

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

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

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

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

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

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

  274.         }

  275.     }

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

  277.        to display the macroblocks is coded here */

  278. 

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

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

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

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

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

  284.     } else {

  285.         s->mb_x = 0;

  286.         s->mb_y = 0;

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

  288.     }

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

  290.     s->f_code = 1;

  291.     s->unrestricted_mv = 1;

  292. 

  293.     return mb_count;

  294. }

  295. 

  296. static int rv20_decode_picture_header(MpegEncContext *s)

  297. {

  298.     int seq, mb_pos, i;

  299.     int rpr_bits;

  300. 

  301. #if 0

  302.     GetBitContext gb= s->gb;

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

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

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

  306.     }

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

  308. #endif

  309. #if 0

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

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

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

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

  314.     }

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

  316. #endif

  317. 

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

  319.     switch(i){

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

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

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

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

  324.     default:

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

  326.         return -1;

  327.     }

  328. 

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

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

  331.         return -1;

  332.     }

  333. 

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

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

  336.         return -1;

  337.     }

  338. 

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

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

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

  342.         return -1;

  343.     }

  344. 

  345.     if(RV_GET_MINOR_VER(s->avctx->sub_id) >= 2)

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

  347. 

  348.     if(RV_GET_MINOR_VER(s->avctx->sub_id) <= 1)

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

  350.     else

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

  352. 

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

  354.     if(rpr_bits){

  355.         int f, new_w, new_h;

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

  357. 

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

  359. 

  360.         if(f){

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

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

  363.         }else{

  364.             new_w= s->orig_width ;

  365.             new_h= s->orig_height;

  366.         }

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

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

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

  370.                 return -1;

  371.             MPV_common_end(s);

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

  373.             s->width  = new_w;

  374.             s->height = new_h;

  375.             if (MPV_common_init(s) < 0)

  376.                 return -1;

  377.         }

  378. 

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

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

  381.         }

  382.     }

  383. 

  384.     mb_pos = ff_h263_decode_mba(s);

  385. 

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

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

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

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

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

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

  392.             s->time= seq;

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

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

  395.         }else{

  396.             s->time= seq;

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

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

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

  400.                 return FRAME_SKIPPED;

  401.             }

  402.             ff_mpeg4_init_direct_mv(s);

  403.         }

  404.     }

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

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

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

  408. }

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

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

  411. 

  412.     if(RV_GET_MINOR_VER(s->avctx->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)

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

  414. 

  415.     s->f_code = 1;

  416.     s->unrestricted_mv = 1;

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

  418. //    s->alt_inter_vlc=1;

  419. //    s->obmc=1;

  420. //    s->umvplus=1;

  421.     s->modified_quant=1;

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

  423.         s->loop_filter=1;

  424. 

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

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

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

  428.     }

  429. 

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

  431. 

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

  433. }

  434. 

  435. static av_cold int rv10_decode_init(AVCodecContext *avctx)

  436. {

  437.     MpegEncContext *s = avctx->priv_data;

  438.     static int done=0;

  439.     int major_ver, minor_ver, micro_ver;

  440. 

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

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

  443.         return -1;

  444.     }

  445. 

  446.     MPV_decode_defaults(s);

  447. 

  448.     s->avctx= avctx;

  449.     s->out_format = FMT_H263;

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

  451. 

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

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

  454. 

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

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

  457. 

  458.     major_ver = RV_GET_MAJOR_VER(avctx->sub_id);

  459.     minor_ver = RV_GET_MINOR_VER(avctx->sub_id);

  460.     micro_ver = RV_GET_MICRO_VER(avctx->sub_id);

  461. 

  462.     s->low_delay = 1;

  463.     switch (major_ver) {

  464.     case 1:

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

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

  467.         break;

  468.     case 2:

  469.         if (minor_ver >= 2) {

  470.             s->low_delay = 0;

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

  472.         }

  473.         break;

  474.     default:

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

  476.         av_log_missing_feature(avctx, "RV1/2 version", 1);

  477.         return AVERROR_PATCHWELCOME;

  478.     }

  479. 

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

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

  482.     }

  483. 

  484.     avctx->pix_fmt = PIX_FMT_YUV420P;

  485. 

  486.     if (MPV_common_init(s) < 0)

  487.         return -1;

  488. 

  489.     h263_decode_init_vlc(s);

  490. 

  491.     /* init rv vlc */

  492.     if (!done) {

  493.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,

  494.                  rv_lum_bits, 1, 1,

  495.                  rv_lum_code, 2, 2, 16384);

  496.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,

  497.                  rv_chrom_bits, 1, 1,

  498.                  rv_chrom_code, 2, 2, 16388);

  499.         done = 1;

  500.     }

  501. 

  502.     return 0;

  503. }

  504. 

  505. static av_cold int rv10_decode_end(AVCodecContext *avctx)

  506. {

  507.     MpegEncContext *s = avctx->priv_data;

  508. 

  509.     MPV_common_end(s);

  510.     return 0;

  511. }

  512. 

  513. static int rv10_decode_packet(AVCodecContext *avctx,

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

  515. {

  516.     MpegEncContext *s = avctx->priv_data;

  517.     int mb_count, mb_pos, left, start_mb_x;

  518. 

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

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

  521.         mb_count = rv10_decode_picture_header(s);

  522.     else

  523.         mb_count = rv20_decode_picture_header(s);

  524.     if (mb_count < 0) {

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

  526.         return -1;

  527.     }

  528. 

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

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

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

  532.         return -1;

  533.     }

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

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

  536.     if (mb_count > left) {

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

  538.         return -1;

  539.     }

  540. 

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

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

  543.             ff_er_frame_end(s);

  544.             MPV_frame_end(s);

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

  546.         }

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

  548.             return -1;

  549.         ff_er_frame_start(s);

  550.     } else {

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

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

  553.             return -1;

  554.         }

  555.     }

  556. 

  557. 

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

  559. 

  560.     /* default quantization values */

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

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

  563.     }else{

  564.         s->first_slice_line=1;

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

  566.     }

  567.     start_mb_x= s->mb_x;

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

  569.     if(s->h263_aic){

  570.         s->y_dc_scale_table=

  571.         s->c_dc_scale_table= ff_aic_dc_scale_table;

  572.     }else{

  573.         s->y_dc_scale_table=

  574.         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;

  575.     }

  576. 

  577.     if(s->modified_quant)

  578.         s->chroma_qscale_table= ff_h263_chroma_qscale_table;

  579. 

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

  581. 

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

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

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

  585.     s->block_wrap[0]=

  586.     s->block_wrap[1]=

  587.     s->block_wrap[2]=

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

  589.     s->block_wrap[4]=

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

  591.     ff_init_block_index(s);

  592.     /* decode each macroblock */

  593. 

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

  595.         int ret;

  596.         ff_update_block_index(s);

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

  598. 

  599.         s->mv_dir = MV_DIR_FORWARD;

  600.         s->mv_type = MV_TYPE_16X16;

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

  602. 

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

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

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

  606.             ret= SLICE_OK;

  607.         }

  608. 

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

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

  611.             return -1;

  612.         }

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

  614.             ff_h263_update_motion_val(s);

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

  616.         if(s->loop_filter)

  617.             ff_h263_loop_filter(s);

  618. 

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

  620.             s->mb_x = 0;

  621.             s->mb_y++;

  622.             ff_init_block_index(s);

  623.         }

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

  625.             s->first_slice_line=0;

  626.         if(ret == SLICE_END) break;

  627.     }

  628. 

  629.     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);

  630. 

  631.     return s->gb.size_in_bits;

  632. }

  633. 

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

  635. {

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

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

  638. }

  639. 

  640. static int rv10_decode_frame(AVCodecContext *avctx,

  641.                              void *data, int *data_size,

  642.                              AVPacket *avpkt)

  643. {

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

  645.     int buf_size = avpkt->size;

  646.     MpegEncContext *s = avctx->priv_data;

  647.     int i;

  648.     AVFrame *pict = data;

  649.     int slice_count;

  650.     const uint8_t *slices_hdr = NULL;

  651. 

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

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

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

  655. 

  656.     /* no supplementary picture */

  657.     if (buf_size == 0) {

  658.         return 0;

  659.     }

  660. 

  661.     if(!avctx->slice_count){

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

  663.         slices_hdr = buf + 4;

  664.         buf += 8 * slice_count;

  665.     }else

  666.         slice_count = avctx->slice_count;

  667. 

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

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

  670.         int size, size2;

  671. 

  672.         if(i+1 == slice_count)

  673.             size= buf_size - offset;

  674.         else

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

  676. 

  677.         if(i+2 >= slice_count)

  678.             size2= buf_size - offset;

  679.         else

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

  681. 

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

  683.             i++;

  684.     }

  685. 

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

  687.         ff_er_frame_end(s);

  688.         MPV_frame_end(s);

  689. 

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

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

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

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

  694.         }

  695. 

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

  697.             *data_size = sizeof(AVFrame);

  698.             ff_print_debug_info(s, pict);

  699.         }

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

  701.     }

  702. 

  703.     return buf_size;

  704. }

  705. 

  706. AVCodec ff_rv10_decoder = {

  707.     .name           = "rv10",

  708.     .type           = AVMEDIA_TYPE_VIDEO,

  709.     .id             = CODEC_ID_RV10,

  710.     .priv_data_size = sizeof(MpegEncContext),

  711.     .init           = rv10_decode_init,

  712.     .close          = rv10_decode_end,

  713.     .decode         = rv10_decode_frame,

  714.     .capabilities   = CODEC_CAP_DR1,

  715.     .max_lowres = 3,

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

  717.     .pix_fmts= ff_pixfmt_list_420,

  718. };

  719. 

  720. AVCodec ff_rv20_decoder = {

  721.     .name           = "rv20",

  722.     .type           = AVMEDIA_TYPE_VIDEO,

  723.     .id             = CODEC_ID_RV20,

  724.     .priv_data_size = sizeof(MpegEncContext),

  725.     .init           = rv10_decode_init,

  726.     .close          = rv10_decode_end,

  727.     .decode         = rv10_decode_frame,

  728.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  729.     .flush= ff_mpeg_flush,

  730.     .max_lowres = 3,

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

  732.     .pix_fmts= ff_pixfmt_list_420,

  733. };