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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. typedef struct RVDecContext {

  44.     MpegEncContext m;

  45.     int sub_id;

  46. } RVDecContext;

  47. 

  48. static const uint16_t rv_lum_code[256] =

  49. {

  50.  0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  51.  0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  52.  0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  53.  0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  54.  0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  55.  0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  56.  0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  57.  0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  58.  0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  59.  0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  60.  0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  61.  0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  62.  0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  63.  0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  64.  0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  65.  0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  66.  0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  67.  0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  68.  0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  69.  0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  70.  0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  71.  0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  72.  0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  73.  0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  74.  0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  75.  0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  76.  0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  77.  0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  78.  0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  79.  0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  80.  0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  81.  0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  82. };

  83. 

  84. static const uint8_t rv_lum_bits[256] =

  85. {

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

  87.  12, 12, 12, 12, 12, 12, 12, 12,

  88.  12, 12, 12, 12, 12, 12, 12, 12,

  89.  12, 12, 12, 12, 12, 12, 12, 12,

  90.  12, 12, 12, 12, 12, 12, 12, 12,

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

  92.  12, 12, 12, 12, 12, 12, 12, 12,

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  110.  12, 12, 12, 12, 12, 12, 12, 12,

  111.  12, 12, 12, 12, 12, 12, 12, 12,

  112.  12, 12, 12, 12, 12, 12, 12, 12,

  113.  12, 12, 12, 12, 12, 12, 12, 12,

  114.  12, 12, 12, 12, 12, 12, 12, 12,

  115.  12, 12, 12, 12, 12, 12, 12, 12,

  116.  12, 12, 12, 12, 12, 12, 12, 12,

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

  118. };

  119. 

  120. static const uint16_t rv_chrom_code[256] =

  121. {

  122.  0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  123.  0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  124.  0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  125.  0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  126.  0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  127.  0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  128.  0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  129.  0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  130.  0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  131.  0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  132.  0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  133.  0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  134.  0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  135.  0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  136.  0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  137.  0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  138.  0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  139.  0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  140.  0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  141.  0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  142.  0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  143.  0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  144.  0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  145.  0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  146.  0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  147.  0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  148.  0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  149.  0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  150.  0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  151.  0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  152.  0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  153.  0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  154. };

  155. 

  156. static const uint8_t rv_chrom_bits[256] =

  157. {

  158.  16, 14, 14, 14, 14, 14, 14, 14,

  159.  14, 14, 14, 14, 14, 14, 14, 14,

  160.  14, 14, 14, 14, 14, 14, 14, 14,

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

  162.  14, 14, 14, 14, 14, 14, 14, 14,

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

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

  165.  14, 14, 14, 14, 14, 14, 14, 14,

  166.  14, 12, 12, 12, 12, 12, 12, 12,

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

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

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

  170.  12, 10, 10, 10, 10, 10, 10, 10,

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

  172.  10,  8,  8,  8,  8,  8,  8,  8,

  173.   8,  6,  6,  6,  6,  4,  4,  3,

  174.   2,  3,  4,  4,  6,  6,  6,  6,

  175.   8,  8,  8,  8,  8,  8,  8,  8,

  176.  10, 10, 10, 10, 10, 10, 10, 10,

  177.  10, 10, 10, 10, 10, 10, 10, 10,

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

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

  180.  12, 12, 12, 12, 12, 12, 12, 12,

  181.  12, 12, 12, 12, 12, 12, 12, 12,

  182.  14, 14, 14, 14, 14, 14, 14, 14,

  183.  14, 14, 14, 14, 14, 14, 14, 14,

  184.  14, 14, 14, 14, 14, 14, 14, 14,

  185.  14, 14, 14, 14, 14, 14, 14, 14,

  186.  14, 14, 14, 14, 14, 14, 14, 14,

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

  188.  14, 14, 14, 14, 14, 14, 14, 14,

  189.  14, 14, 14, 14, 14, 14, 14, 14,

  190. };

  191. 

  192. static VLC rv_dc_lum, rv_dc_chrom;

  193. 

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

  195. {

  196.     int code;

  197. 

  198.     if (n < 4) {

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

  200.         if (code < 0) {

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

  202.                necessary. The following code would be completely useless

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

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

  205.             if (code == 0x7c) {

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

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

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

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

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

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

  212.                 else

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

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

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

  216.                 code = 1;

  217.             }

  218.         } else {

  219.             code -= 128;

  220.         }

  221.     } else {

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

  223.         /* same remark */

  224.         if (code < 0) {

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

  226.             if (code == 0x1fc) {

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

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

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

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

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

  232.                 code = 1;

  233.             } else {

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

  235.                 return 0xffff;

  236.             }

  237.         } else {

  238.             code -= 128;

  239.         }

  240.     }

  241.     return -code;

  242. }

  243. 

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

  245. static int rv10_decode_picture_header(MpegEncContext *s)

  246. {

  247.     int mb_count, pb_frame, marker, mb_xy;

  248. 

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

  250. 

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

  252.         s->pict_type = AV_PICTURE_TYPE_P;

  253.     else

  254.         s->pict_type = AV_PICTURE_TYPE_I;

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

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

  257. 

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

  259. 

  260.     if (pb_frame){

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

  262.         return -1;

  263.     }

  264. 

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

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

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

  268.         return -1;

  269.     }

  270. 

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

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

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

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

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

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

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

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

  279.         }

  280.     }

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

  282.        to display the macroblocks is coded here */

  283. 

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

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

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

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

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

  289.     } else {

  290.         s->mb_x = 0;

  291.         s->mb_y = 0;

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

  293.     }

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

  295.     s->f_code = 1;

  296.     s->unrestricted_mv = 1;

  297. 

  298.     return mb_count;

  299. }

  300. 

  301. static int rv20_decode_picture_header(RVDecContext *rv)

  302. {

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

  304.     int seq, mb_pos, i;

  305.     int rpr_bits;

  306. 

  307. #if 0

  308.     GetBitContext gb= s->gb;

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

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

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

  312.     }

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

  314. #endif

  315. #if 0

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

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

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

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

  320.     }

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

  322. #endif

  323. 

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

  325.     switch(i){

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

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

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

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

  330.     default:

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

  332.         return -1;

  333.     }

  334. 

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

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

  337.         return -1;

  338.     }

  339. 

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

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

  342.         return -1;

  343.     }

  344. 

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

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

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

  348.         return -1;

  349.     }

  350. 

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

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

  353. 

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

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

  356.     else

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

  358. 

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

  360.     if(rpr_bits){

  361.         int f, new_w, new_h;

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

  363. 

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

  365. 

  366.         if(f){

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

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

  369.         }else{

  370.             new_w= s->orig_width ;

  371.             new_h= s->orig_height;

  372.         }

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

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

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

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

  377.                 return -1;

  378.             ff_MPV_common_end(s);

  379. 

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

  381.             if (!old_aspect.num)

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

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

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

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

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

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

  388.             s->width  = new_w;

  389.             s->height = new_h;

  390.             if (ff_MPV_common_init(s) < 0)

  391.                 return -1;

  392.         }

  393. 

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

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

  396.         }

  397.     } else if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)

  398.         return AVERROR_INVALIDDATA;

  399. 

  400.     mb_pos = ff_h263_decode_mba(s);

  401. 

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

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

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

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

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

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

  408.             s->time= seq;

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

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

  411.         }else{

  412.             s->time= seq;

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

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

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

  416.                 return FRAME_SKIPPED;

  417.             }

  418.             ff_mpeg4_init_direct_mv(s);

  419.         }

  420.     }

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

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

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

  424. }

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

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

  427. 

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

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

  430. 

  431.     s->f_code = 1;

  432.     s->unrestricted_mv = 1;

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

  434. //    s->alt_inter_vlc=1;

  435. //    s->obmc=1;

  436. //    s->umvplus=1;

  437.     s->modified_quant=1;

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

  439.         s->loop_filter=1;

  440. 

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

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

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

  444.     }

  445. 

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

  447. 

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

  449. }

  450. 

  451. static av_cold int rv10_decode_init(AVCodecContext *avctx)

  452. {

  453.     RVDecContext  *rv = avctx->priv_data;

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

  455.     static int done=0;

  456.     int major_ver, minor_ver, micro_ver;

  457. 

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

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

  460.         return -1;

  461.     }

  462. 

  463.     ff_MPV_decode_defaults(s);

  464. 

  465.     s->avctx= avctx;

  466.     s->out_format = FMT_H263;

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

  468. 

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

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

  471. 

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

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

  474. 

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

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

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

  478. 

  479.     s->low_delay = 1;

  480.     switch (major_ver) {

  481.     case 1:

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

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

  484.         break;

  485.     case 2:

  486.         if (minor_ver >= 2) {

  487.             s->low_delay = 0;

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

  489.         }

  490.         break;

  491.     default:

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

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

  494.         return AVERROR_PATCHWELCOME;

  495.     }

  496. 

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

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

  499.     }

  500. 

  501.     avctx->pix_fmt = PIX_FMT_YUV420P;

  502. 

  503.     if (ff_MPV_common_init(s) < 0)

  504.         return -1;

  505. 

  506.     ff_h263_decode_init_vlc(s);

  507. 

  508.     /* init rv vlc */

  509.     if (!done) {

  510.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,

  511.                  rv_lum_bits, 1, 1,

  512.                  rv_lum_code, 2, 2, 16384);

  513.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,

  514.                  rv_chrom_bits, 1, 1,

  515.                  rv_chrom_code, 2, 2, 16388);

  516.         done = 1;

  517.     }

  518. 

  519.     return 0;

  520. }

  521. 

  522. static av_cold int rv10_decode_end(AVCodecContext *avctx)

  523. {

  524.     MpegEncContext *s = avctx->priv_data;

  525. 

  526.     ff_MPV_common_end(s);

  527.     return 0;

  528. }

  529. 

  530. static int rv10_decode_packet(AVCodecContext *avctx,

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

  532. {

  533.     RVDecContext  *rv = avctx->priv_data;

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

  535.     int mb_count, mb_pos, left, start_mb_x, active_bits_size;

  536. 

  537.     active_bits_size = buf_size * 8;

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

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

  540.         mb_count = rv10_decode_picture_header(s);

  541.     else

  542.         mb_count = rv20_decode_picture_header(rv);

  543.     if (mb_count < 0) {

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

  545.         return -1;

  546.     }

  547. 

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

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

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

  551.         return -1;

  552.     }

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

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

  555.     if (mb_count > left) {

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

  557.         return -1;

  558.     }

  559. 

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

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

  562.             ff_er_frame_end(s);

  563.             ff_MPV_frame_end(s);

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

  565.         }

  566.         if(ff_MPV_frame_start(s, avctx) < 0)

  567.             return -1;

  568.         ff_er_frame_start(s);

  569.     } else {

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

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

  572.             return -1;

  573.         }

  574.     }

  575. 

  576. 

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

  578. 

  579.     /* default quantization values */

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

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

  590.         s->c_dc_scale_table= ff_aic_dc_scale_table;

  591.     }else{

  592.         s->y_dc_scale_table=

  593.         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;

  594.     }

  595. 

  596.     if(s->modified_quant)

  597.         s->chroma_qscale_table= ff_h263_chroma_qscale_table;

  598. 

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

  600. 

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

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

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

  604.     s->block_wrap[0]=

  605.     s->block_wrap[1]=

  606.     s->block_wrap[2]=

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

  608.     s->block_wrap[4]=

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

  610.     ff_init_block_index(s);

  611.     /* decode each macroblock */

  612. 

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

  614.         int ret;

  615.         ff_update_block_index(s);

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

  617. 

  618.         s->mv_dir = MV_DIR_FORWARD;

  619.         s->mv_type = MV_TYPE_16X16;

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

  621. 

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

  623.         // bitstream size

  624.         if (ret != SLICE_ERROR) {

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

  626. 

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

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

  629. 

  630.             if (!v)

  631.                 ret = SLICE_END;

  632.         }

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

  634.             8 * buf_size2 >= get_bits_count(&s->gb)) {

  635.             active_bits_size = buf_size2 * 8;

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

  637.                    8 * buf_size, active_bits_size);

  638.             ret= SLICE_OK;

  639.         }

  640. 

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

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

  643.             return -1;

  644.         }

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

  646.             ff_h263_update_motion_val(s);

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

  648.         if(s->loop_filter)

  649.             ff_h263_loop_filter(s);

  650. 

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

  652.             s->mb_x = 0;

  653.             s->mb_y++;

  654.             ff_init_block_index(s);

  655.         }

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

  657.             s->first_slice_line=0;

  658.         if(ret == SLICE_END) break;

  659.     }

  660. 

  661.     ff_er_add_slice(s, start_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, 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) return avctx->slice_offset[n];

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

  670. }

  671. 

  672. static int rv10_decode_frame(AVCodecContext *avctx,

  673.                              void *data, int *data_size,

  674.                              AVPacket *avpkt)

  675. {

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

  677.     int buf_size = avpkt->size;

  678.     MpegEncContext *s = avctx->priv_data;

  679.     int i;

  680.     AVFrame *pict = data;

  681.     int slice_count;

  682.     const uint8_t *slices_hdr = NULL;

  683. 

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

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

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

  687. 

  688.     /* no supplementary picture */

  689.     if (buf_size == 0) {

  690.         return 0;

  691.     }

  692. 

  693.     if(!avctx->slice_count){

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

  695.         buf_size--;

  696.         slices_hdr = buf + 4;

  697.         buf += 8 * slice_count;

  698.         buf_size -= 8 * slice_count;

  699.         if (buf_size <= 0)

  700.             return AVERROR_INVALIDDATA;

  701.     }else

  702.         slice_count = avctx->slice_count;

  703. 

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

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

  706.         int size, size2;

  707. 

  708.         if (offset >= buf_size)

  709.             return AVERROR_INVALIDDATA;

  710. 

  711.         if(i+1 == slice_count)

  712.             size= buf_size - offset;

  713.         else

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

  715. 

  716.         if(i+2 >= slice_count)

  717.             size2= buf_size - offset;

  718.         else

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

  720. 

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

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

  723.             return AVERROR_INVALIDDATA;

  724. 

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

  726.             i++;

  727.     }

  728. 

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

  730.         ff_er_frame_end(s);

  731.         ff_MPV_frame_end(s);

  732. 

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

  734.             *pict = s->current_picture_ptr->f;

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

  736.             *pict = s->last_picture_ptr->f;

  737.         }

  738. 

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

  740.             *data_size = sizeof(AVFrame);

  741.             ff_print_debug_info(s, pict);

  742.         }

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

  744.     }

  745. 

  746.     return avpkt->size;

  747. }

  748. 

  749. AVCodec ff_rv10_decoder = {

  750.     .name           = "rv10",

  751.     .type           = AVMEDIA_TYPE_VIDEO,

  752.     .id             = AV_CODEC_ID_RV10,

  753.     .priv_data_size = sizeof(RVDecContext),

  754.     .init           = rv10_decode_init,

  755.     .close          = rv10_decode_end,

  756.     .decode         = rv10_decode_frame,

  757.     .capabilities   = CODEC_CAP_DR1,

  758.     .max_lowres     = 3,

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

  760.     .pix_fmts       = ff_pixfmt_list_420,

  761. };

  762. 

  763. AVCodec ff_rv20_decoder = {

  764.     .name           = "rv20",

  765.     .type           = AVMEDIA_TYPE_VIDEO,

  766.     .id             = AV_CODEC_ID_RV20,

  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 | CODEC_CAP_DELAY,

  772.     .flush          = ff_mpeg_flush,

  773.     .max_lowres     = 3,

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

  775.     .pix_fmts       = ff_pixfmt_list_420,

  776. };