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FFmpeg/libavcodec/rv10.c

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  1. /*

  2.  * RV10/RV20 decoder

  3.  * Copyright (c) 2000,2001 Fabrice Bellard

  4.  * Copyright (c) 2002-2004 Michael Niedermayer

  5.  *

  6.  * This file is part of Libav.

  7.  *

  8.  * Libav is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * Libav is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with Libav; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * RV10/RV20 decoder

  26.  */

  27. 

  28. #include <inttypes.h>

  29. 

  30. #include "libavutil/imgutils.h"

  31. 

  32. #include "avcodec.h"

  33. #include "error_resilience.h"

  34. #include "h263.h"

  35. #include "h263data.h"

  36. #include "internal.h"

  37. #include "mpeg_er.h"

  38. #include "mpegutils.h"

  39. #include "mpegvideo.h"

  40. #include "mpeg4video.h"

  41. #include "mpegvideodata.h"

  42. #include "rv10.h"

  43. 

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

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

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

  47. 

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

  49. 

  50. typedef struct RVDecContext {

  51.     MpegEncContext m;

  52.     int sub_id;

  53.     int orig_width, orig_height;

  54. } RVDecContext;

  55. 

  56. static const uint16_t rv_lum_code[256] = {

  57.     0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  58.     0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  59.     0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  60.     0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  61.     0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  62.     0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  63.     0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  64.     0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  65.     0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  66.     0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  67.     0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  68.     0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  69.     0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  70.     0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  71.     0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  72.     0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  73.     0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  74.     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  75.     0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  76.     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  77.     0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  78.     0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  79.     0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  80.     0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  81.     0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  82.     0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  83.     0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  84.     0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  85.     0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  86.     0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  87.     0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  88.     0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  89. };

  90. 

  91. static const uint8_t rv_lum_bits[256] = {

  92.     14, 12, 12, 12, 12, 12, 12, 12,

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

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

  95.     12, 12, 12, 12, 12, 12, 12, 12,

  96.     12, 12, 12, 12, 12, 12, 12, 12,

  97.     12, 12, 12, 12, 12, 12, 12, 12,

  98.     12, 12, 12, 12, 12, 12, 12, 12,

  99.     12, 12, 12, 12, 12, 12, 12, 12,

  100.     12, 10, 10, 10, 10, 10, 10, 10,

  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,  8,  8,  8,  8,  8,  8,  8,

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

  106.      8,  7,  7,  7,  7,  7,  7,  7,

  107.      7,  6,  6,  6,  6,  5,  5,  4,

  108.      2,  4,  5,  5,  6,  6,  6,  6,

  109.      7,  7,  7,  7,  7,  7,  7,  7,

  110.      8,  8,  8,  8,  8,  8,  8,  8,

  111.      8,  8,  8,  8,  8,  8,  8,  8,

  112.     10, 10, 10, 10, 10, 10, 10, 10,

  113.     10, 10, 10, 10, 10, 10, 10, 10,

  114.     10, 10, 10, 10, 10, 10, 10, 10,

  115.     10, 10, 10, 10, 10, 10, 10, 10,

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

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

  118.     12, 12, 12, 12, 12, 12, 12, 12,

  119.     12, 12, 12, 12, 12, 12, 12, 12,

  120.     12, 12, 12, 12, 12, 12, 12, 12,

  121.     12, 12, 12, 12, 12, 12, 12, 12,

  122.     12, 12, 12, 12, 12, 12, 12, 12,

  123.     12, 12, 12, 12, 12, 12, 12, 12,

  124. };

  125. 

  126. static const uint16_t rv_chrom_code[256] = {

  127.     0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  128.     0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  129.     0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  130.     0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  131.     0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  132.     0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  133.     0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  134.     0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  135.     0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  136.     0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  137.     0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  138.     0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  139.     0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  140.     0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  141.     0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  142.     0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  143.     0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  144.     0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  145.     0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  146.     0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  147.     0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  148.     0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  149.     0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  150.     0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  151.     0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  152.     0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  153.     0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  154.     0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  155.     0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  156.     0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  157.     0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  158.     0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  159. };

  160. 

  161. static const uint8_t rv_chrom_bits[256] = {

  162.     16, 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, 14, 14, 14, 14, 14, 14, 14,

  167.     14, 14, 14, 14, 14, 14, 14, 14,

  168.     14, 14, 14, 14, 14, 14, 14, 14,

  169.     14, 14, 14, 14, 14, 14, 14, 14,

  170.     14, 12, 12, 12, 12, 12, 12, 12,

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

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

  173.     12, 12, 12, 12, 12, 12, 12, 12,

  174.     12, 10, 10, 10, 10, 10, 10, 10,

  175.     10, 10, 10, 10, 10, 10, 10, 10,

  176.     10,  8,  8,  8,  8,  8,  8,  8,

  177.      8,  6,  6,  6,  6,  4,  4,  3,

  178.      2,  3,  4,  4,  6,  6,  6,  6,

  179.      8,  8,  8,  8,  8,  8,  8,  8,

  180.     10, 10, 10, 10, 10, 10, 10, 10,

  181.     10, 10, 10, 10, 10, 10, 10, 10,

  182.     12, 12, 12, 12, 12, 12, 12, 12,

  183.     12, 12, 12, 12, 12, 12, 12, 12,

  184.     12, 12, 12, 12, 12, 12, 12, 12,

  185.     12, 12, 12, 12, 12, 12, 12, 12,

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

  191.     14, 14, 14, 14, 14, 14, 14, 14,

  192.     14, 14, 14, 14, 14, 14, 14, 14,

  193.     14, 14, 14, 14, 14, 14, 14, 14,

  194. };

  195. 

  196. static VLC rv_dc_lum, rv_dc_chrom;

  197. 

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

  199. {

  200.     int code;

  201. 

  202.     if (n < 4) {

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

  204.         if (code < 0) {

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

  206.              * necessary. The following code would be completely useless

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

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

  209.             if (code == 0x7c) {

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

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

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

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

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

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

  216.                 else

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

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

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

  220.                 code = 1;

  221.             }

  222.         } else {

  223.             code -= 128;

  224.         }

  225.     } else {

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

  227.         /* same remark */

  228.         if (code < 0) {

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

  230.             if (code == 0x1fc) {

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

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

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

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

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

  236.                 code = 1;

  237.             } else {

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

  239.                 return 0xffff;

  240.             }

  241.         } else {

  242.             code -= 128;

  243.         }

  244.     }

  245.     return -code;

  246. }

  247. 

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

  249. static int rv10_decode_picture_header(MpegEncContext *s)

  250. {

  251.     int mb_count, pb_frame, marker, mb_xy;

  252. 

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

  254. 

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

  256.         s->pict_type = AV_PICTURE_TYPE_P;

  257.     else

  258.         s->pict_type = AV_PICTURE_TYPE_I;

  259. 

  260.     if (!marker)

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

  262. 

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

  264. 

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

  266. 

  267.     if (pb_frame) {

  268.         avpriv_request_sample(s->avctx, "PB-frame");

  269.         return AVERROR_PATCHWELCOME;

  270.     }

  271. 

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

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

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

  275.         return AVERROR_INVALIDDATA;

  276.     }

  277. 

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

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

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

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

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

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

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

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

  286.         }

  287.     }

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

  289.      * to display the macroblocks is coded here */

  290. 

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

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

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

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

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

  296.     } else {

  297.         s->mb_x  = 0;

  298.         s->mb_y  = 0;

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

  300.     }

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

  302.     s->f_code          = 1;

  303.     s->unrestricted_mv = 1;

  304. 

  305.     return mb_count;

  306. }

  307. 

  308. static int rv20_decode_picture_header(RVDecContext *rv)

  309. {

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

  311.     int seq, mb_pos, i, ret;

  312.     int rpr_bits;

  313. 

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

  315.     switch (i) {

  316.     case 0:

  317.         s->pict_type = AV_PICTURE_TYPE_I;

  318.         break;

  319.     case 1:

  320.         s->pict_type = AV_PICTURE_TYPE_I;

  321.         break;                                  // hmm ...

  322.     case 2:

  323.         s->pict_type = AV_PICTURE_TYPE_P;

  324.         break;

  325.     case 3:

  326.         s->pict_type = AV_PICTURE_TYPE_B;

  327.         break;

  328.     default:

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

  330.         return AVERROR_INVALIDDATA;

  331.     }

  332. 

  333.     if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {

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

  335.         return AVERROR_INVALIDDATA;

  336.     }

  337. 

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

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

  340.         return AVERROR_INVALIDDATA;

  341.     }

  342. 

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

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

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

  346.         return AVERROR_INVALIDDATA;

  347.     }

  348. 

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

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

  351. 

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

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

  354.     else

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

  356. 

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

  358.     if (rpr_bits) {

  359.         int f, new_w, new_h;

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

  361. 

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

  363. 

  364.         if (f) {

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

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

  367.                 return AVERROR_INVALIDDATA;

  368.             }

  369. 

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

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

  372.         } else {

  373.             new_w = rv->orig_width;

  374.             new_h = rv->orig_height;

  375.         }

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

  377.             av_log(s->avctx, AV_LOG_DEBUG,

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

  379.             ff_mpv_common_end(s);

  380. 

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

  382.             if (ret < 0)

  383.                 return ret;

  384. 

  385.             s->width  = new_w;

  386.             s->height = new_h;

  387.             if ((ret = ff_mpv_common_init(s)) < 0)

  388.                 return ret;

  389.         }

  390. 

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

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

  393.         }

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

  395.         return AVERROR_INVALIDDATA;

  396. 

  397.     mb_pos = ff_h263_decode_mba(s);

  398. 

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

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

  401.         seq -= 0x8000;

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

  403.         seq += 0x8000;

  404. 

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

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

  407.             s->time            = seq;

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

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

  410.         } else {

  411.             s->time    = seq;

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

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

  414.                 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 "

  416.                        "from seeking? skipping current B-frame\n");

  417.                 return FRAME_SKIPPED;

  418.             }

  419.             ff_mpeg4_init_direct_mv(s);

  420.         }

  421.     }

  422. 

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

  424. 

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

  426.         // binary decoder reads 3+2 bits here but they don't seem to be used

  427.         skip_bits(&s->gb, 5);

  428. 

  429.     s->f_code          = 1;

  430.     s->unrestricted_mv = 1;

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

  432.     s->modified_quant  = 1;

  433.     s->loop_filter     = 1;

  434. 

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

  436.         av_log(s->avctx, AV_LOG_INFO,

  437.                "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",

  438.                seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,

  439.                s->no_rounding);

  440.     }

  441. 

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

  443. 

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

  445. }

  446. 

  447. static av_cold int rv10_decode_init(AVCodecContext *avctx)

  448. {

  449.     RVDecContext *rv = avctx->priv_data;

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

  451.     static int done = 0;

  452.     int major_ver, minor_ver, micro_ver, ret;

  453. 

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

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

  456.         return AVERROR_INVALIDDATA;

  457.     }

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

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

  460.         return ret;

  461. 

  462.     ff_mpv_decode_defaults(s);

  463. 

  464.     s->avctx       = avctx;

  465.     s->out_format  = FMT_H263;

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

  467. 

  468.     rv->orig_width  =

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

  470.     rv->orig_height =

  471.     s->height       = avctx->coded_height;

  472. 

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

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

  475. 

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

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

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

  479. 

  480.     s->low_delay = 1;

  481.     switch (major_ver) {

  482.     case 1:

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

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

  485.         break;

  486.     case 2:

  487.         if (minor_ver >= 2) {

  488.             s->low_delay           = 0;

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

  490.         }

  491.         break;

  492.     default:

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

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

  495.         return AVERROR_PATCHWELCOME;

  496.     }

  497. 

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

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

  500.                avctx->extradata_size >= 4 ? ((int *) avctx->extradata)[0] : -1);

  501.     }

  502. 

  503.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  504. 

  505.     ff_mpv_idct_init(s);

  506.     if ((ret = ff_mpv_common_init(s)) < 0)

  507.         return ret;

  508. 

  509.     ff_h263dsp_init(&s->h263dsp);

  510.     ff_h263_decode_init_vlc();

  511. 

  512.     /* init rv vlc */

  513.     if (!done) {

  514.         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,

  515.                         rv_lum_bits, 1, 1,

  516.                         rv_lum_code, 2, 2, 16384);

  517.         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,

  518.                         rv_chrom_bits, 1, 1,

  519.                         rv_chrom_code, 2, 2, 16388);

  520.         done = 1;

  521.     }

  522. 

  523.     return 0;

  524. }

  525. 

  526. static av_cold int rv10_decode_end(AVCodecContext *avctx)

  527. {

  528.     MpegEncContext *s = avctx->priv_data;

  529. 

  530.     ff_mpv_common_end(s);

  531.     return 0;

  532. }

  533. 

  534. static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,

  535.                               int buf_size, int buf_size2)

  536. {

  537.     RVDecContext *rv = avctx->priv_data;

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

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

  540. 

  541.     active_bits_size = buf_size * 8;

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

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

  544.         mb_count = rv10_decode_picture_header(s);

  545.     else

  546.         mb_count = rv20_decode_picture_header(rv);

  547.     if (mb_count < 0) {

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

  549.         return AVERROR_INVALIDDATA;

  550.     }

  551. 

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

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

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

  555.         return AVERROR_INVALIDDATA;

  556.     }

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

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

  559.     if (mb_count > left) {

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

  561.         return AVERROR_INVALIDDATA;

  562.     }

  563. 

  564.     if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {

  565.         // FIXME write parser so we always have complete frames?

  566.         if (s->current_picture_ptr) {

  567.             ff_er_frame_end(&s->er);

  568.             ff_mpv_frame_end(s);

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

  570.         }

  571.         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)

  572.             return ret;

  573.         ff_mpeg_er_frame_start(s);

  574.     } else {

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

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

  577.             return AVERROR_INVALIDDATA;

  578.         }

  579.     }

  580. 

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

  582. 

  583.     /* default quantization values */

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

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

  586.             s->first_slice_line = 1;

  587.     } else {

  588.         s->first_slice_line = 1;

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

  590.     }

  591.     start_mb_x     = s->mb_x;

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

  593.     if (s->h263_aic) {

  594.         s->y_dc_scale_table =

  595.         s->c_dc_scale_table = ff_aic_dc_scale_table;

  596.     } else {

  597.         s->y_dc_scale_table =

  598.         s->c_dc_scale_table = ff_mpeg1_dc_scale_table;

  599.     }

  600. 

  601.     if (s->modified_quant)

  602.         s->chroma_qscale_table = ff_h263_chroma_qscale_table;

  603. 

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

  605. 

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

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

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

  609.     s->block_wrap[0] =

  610.     s->block_wrap[1] =

  611.     s->block_wrap[2] =

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

  613.     s->block_wrap[4] =

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

  615.     ff_init_block_index(s);

  616. 

  617.     /* decode each macroblock */

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

  619.         int ret;

  620.         ff_update_block_index(s);

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

  622. 

  623.         s->mv_dir  = MV_DIR_FORWARD;

  624.         s->mv_type = MV_TYPE_16X16;

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

  626. 

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

  628.         // bitstream size

  629.         if (ret != SLICE_ERROR) {

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

  631. 

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

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

  634. 

  635.             if (!v)

  636.                 ret = SLICE_END;

  637.         }

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

  639.             8 * buf_size2 >= get_bits_count(&s->gb)) {

  640.             active_bits_size = buf_size2 * 8;

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

  642.                    8 * buf_size, active_bits_size);

  643.             ret = SLICE_OK;

  644.         }

  645. 

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

  647.             av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,

  648.                    s->mb_y);

  649.             return AVERROR_INVALIDDATA;

  650.         }

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

  652.             ff_h263_update_motion_val(s);

  653.         ff_mpv_decode_mb(s, s->block);

  654.         if (s->loop_filter)

  655.             ff_h263_loop_filter(s);

  656. 

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

  658.             s->mb_x = 0;

  659.             s->mb_y++;

  660.             ff_init_block_index(s);

  661.         }

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

  663.             s->first_slice_line = 0;

  664.         if (ret == SLICE_END)

  665.             break;

  666.     }

  667. 

  668.     ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,

  669.                     ER_MB_END);

  670. 

  671.     return active_bits_size;

  672. }

  673. 

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

  675. {

  676.     if (avctx->slice_count)

  677.         return avctx->slice_offset[n];

  678.     else

  679.         return AV_RL32(buf + n * 8);

  680. }

  681. 

  682. static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  683.                              AVPacket *avpkt)

  684. {

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

  686.     int buf_size       = avpkt->size;

  687.     MpegEncContext *s = avctx->priv_data;

  688.     AVFrame *pict = data;

  689.     int i, ret;

  690.     int slice_count;

  691.     const uint8_t *slices_hdr = NULL;

  692. 

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

  694. 

  695.     /* no supplementary picture */

  696.     if (buf_size == 0) {

  697.         return 0;

  698.     }

  699. 

  700.     if (!avctx->slice_count) {

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

  702.         buf_size--;

  703. 

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

  705.             av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",

  706.                    slice_count);

  707.             return AVERROR_INVALIDDATA;

  708.         }

  709. 

  710.         slices_hdr = buf + 4;

  711.         buf       += 8 * slice_count;

  712.         buf_size  -= 8 * slice_count;

  713.     } else

  714.         slice_count = avctx->slice_count;

  715. 

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

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

  718.         int size, size2;

  719. 

  720.         if (offset >= buf_size)

  721.             return AVERROR_INVALIDDATA;

  722. 

  723.         if (i + 1 == slice_count)

  724.             size = buf_size - offset;

  725.         else

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

  727. 

  728.         if (i + 2 >= slice_count)

  729.             size2 = buf_size - offset;

  730.         else

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

  732. 

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

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

  735.             return AVERROR_INVALIDDATA;

  736. 

  737.         if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2)) < 0)

  738.             return ret;

  739. 

  740.         if (ret > 8 * size)

  741.             i++;

  742.     }

  743. 

  744.     if (s->current_picture_ptr && s->mb_y >= s->mb_height) {

  745.         ff_er_frame_end(&s->er);

  746.         ff_mpv_frame_end(s);

  747. 

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

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

  750.                 return ret;

  751.             ff_print_debug_info(s, s->current_picture_ptr);

  752.         } else if (s->last_picture_ptr) {

  753.             if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)

  754.                 return ret;

  755.             ff_print_debug_info(s, s->last_picture_ptr);

  756.         }

  757. 

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

  759.             *got_frame = 1;

  760.         }

  761. 

  762.         // so we can detect if frame_end was not called (find some nicer solution...)

  763.         s->current_picture_ptr = NULL;

  764.     }

  765. 

  766.     return avpkt->size;

  767. }

  768. 

  769. AVCodec ff_rv10_decoder = {

  770.     .name           = "rv10",

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

  772.     .type           = AVMEDIA_TYPE_VIDEO,

  773.     .id             = AV_CODEC_ID_RV10,

  774.     .priv_data_size = sizeof(RVDecContext),

  775.     .init           = rv10_decode_init,

  776.     .close          = rv10_decode_end,

  777.     .decode         = rv10_decode_frame,

  778.     .capabilities   = AV_CODEC_CAP_DR1,

  779.     .pix_fmts       = (const enum AVPixelFormat[]) {

  780.         AV_PIX_FMT_YUV420P,

  781.         AV_PIX_FMT_NONE

  782.     },

  783. };

  784. 

  785. AVCodec ff_rv20_decoder = {

  786.     .name           = "rv20",

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

  788.     .type           = AVMEDIA_TYPE_VIDEO,

  789.     .id             = AV_CODEC_ID_RV20,

  790.     .priv_data_size = sizeof(RVDecContext),

  791.     .init           = rv10_decode_init,

  792.     .close          = rv10_decode_end,

  793.     .decode         = rv10_decode_frame,

  794.     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,

  795.     .flush          = ff_mpeg_flush,

  796.     .pix_fmts       = (const enum AVPixelFormat[]) {

  797.         AV_PIX_FMT_YUV420P,

  798.         AV_PIX_FMT_NONE

  799.     },

  800. };