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FFmpeg/libavcodec/rv10.c

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  1. /*

  2.  * RV10 codec

  3.  * Copyright (c) 2000,2001 Gerard Lantau.

  4.  *

  5.  * This program is free software; you can redistribute it and/or modify

  6.  * it under the terms of the GNU General Public License as published by

  7.  * the Free Software Foundation; either version 2 of the License, or

  8.  * (at your option) any later version.

  9.  *

  10.  * This program is distributed in the hope that it will be useful,

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

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  13.  * GNU General Public License for more details.

  14.  *

  15.  * You should have received a copy of the GNU General Public License

  16.  * along with this program; if not, write to the Free Software

  17.  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  18.  */

  19. #include "avcodec.h"

  20. #include "dsputil.h"

  21. #include "mpegvideo.h"

  22. 

  23. //#define DEBUG

  24. 

  25. static const UINT16 rv_lum_code[256] =

  26. {

  27.  0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  28.  0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  29.  0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  30.  0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  31.  0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  32.  0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  33.  0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  34.  0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  35.  0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  36.  0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  37.  0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  38.  0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  39.  0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  40.  0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  41.  0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  42.  0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  43.  0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  44.  0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  45.  0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  46.  0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  47.  0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  48.  0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  49.  0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  50.  0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  51.  0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  52.  0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  53.  0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  54.  0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  55.  0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  56.  0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  57.  0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  58.  0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  59. };

  60. 

  61. static const UINT8 rv_lum_bits[256] = 

  62. {

  63.  14, 12, 12, 12, 12, 12, 12, 12,

  64.  12, 12, 12, 12, 12, 12, 12, 12,

  65.  12, 12, 12, 12, 12, 12, 12, 12,

  66.  12, 12, 12, 12, 12, 12, 12, 12,

  67.  12, 12, 12, 12, 12, 12, 12, 12,

  68.  12, 12, 12, 12, 12, 12, 12, 12,

  69.  12, 12, 12, 12, 12, 12, 12, 12,

  70.  12, 12, 12, 12, 12, 12, 12, 12,

  71.  12, 10, 10, 10, 10, 10, 10, 10,

  72.  10, 10, 10, 10, 10, 10, 10, 10,

  73.  10, 10, 10, 10, 10, 10, 10, 10,

  74.  10, 10, 10, 10, 10, 10, 10, 10,

  75.  10,  8,  8,  8,  8,  8,  8,  8,

  76.   8,  8,  8,  8,  8,  8,  8,  8,

  77.   8,  7,  7,  7,  7,  7,  7,  7,

  78.   7,  6,  6,  6,  6,  5,  5,  4,

  79.   2,  4,  5,  5,  6,  6,  6,  6,

  80.   7,  7,  7,  7,  7,  7,  7,  7,

  81.   8,  8,  8,  8,  8,  8,  8,  8,

  82.   8,  8,  8,  8,  8,  8,  8,  8,

  83.  10, 10, 10, 10, 10, 10, 10, 10,

  84.  10, 10, 10, 10, 10, 10, 10, 10,

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

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

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

  95. };

  96. 

  97. static const UINT16 rv_chrom_code[256] =

  98. {

  99.  0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  100.  0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  101.  0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  102.  0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  103.  0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  104.  0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  105.  0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  106.  0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  107.  0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  108.  0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  109.  0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  110.  0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  111.  0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  112.  0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  113.  0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  114.  0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  115.  0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  116.  0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  117.  0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  118.  0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  119.  0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  120.  0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  121.  0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  122.  0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  123.  0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  124.  0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  125.  0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  126.  0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  127.  0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  128.  0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  129.  0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  130.  0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  131. };

  132. 

  133. static const UINT8 rv_chrom_bits[256] =

  134. {

  135.  16, 14, 14, 14, 14, 14, 14, 14,

  136.  14, 14, 14, 14, 14, 14, 14, 14,

  137.  14, 14, 14, 14, 14, 14, 14, 14,

  138.  14, 14, 14, 14, 14, 14, 14, 14,

  139.  14, 14, 14, 14, 14, 14, 14, 14,

  140.  14, 14, 14, 14, 14, 14, 14, 14,

  141.  14, 14, 14, 14, 14, 14, 14, 14,

  142.  14, 14, 14, 14, 14, 14, 14, 14,

  143.  14, 12, 12, 12, 12, 12, 12, 12,

  144.  12, 12, 12, 12, 12, 12, 12, 12,

  145.  12, 12, 12, 12, 12, 12, 12, 12,

  146.  12, 12, 12, 12, 12, 12, 12, 12,

  147.  12, 10, 10, 10, 10, 10, 10, 10,

  148.  10, 10, 10, 10, 10, 10, 10, 10,

  149.  10,  8,  8,  8,  8,  8,  8,  8,

  150.   8,  6,  6,  6,  6,  4,  4,  3,

  151.   2,  3,  4,  4,  6,  6,  6,  6,

  152.   8,  8,  8,  8,  8,  8,  8,  8,

  153.  10, 10, 10, 10, 10, 10, 10, 10,

  154.  10, 10, 10, 10, 10, 10, 10, 10,

  155.  12, 12, 12, 12, 12, 12, 12, 12,

  156.  12, 12, 12, 12, 12, 12, 12, 12,

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

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

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

  167. };

  168. 

  169. static VLC rv_dc_lum, rv_dc_chrom;

  170. 

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

  172. {

  173.     int code;

  174. 

  175.     if (n < 4) {

  176.         code = get_vlc(&s->gb, &rv_dc_lum);

  177.         if (code < 0) {

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

  179.                necessary. The following code would be completely useless

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

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

  182.             if (code == 0x7c) {

  183.                 code = (INT8)(get_bits(&s->gb, 7) + 1);

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

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

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

  187.                 if (get_bits(&s->gb, 1) == 0)

  188.                     code = (INT8)(get_bits(&s->gb, 8) + 1);

  189.                 else

  190.                     code = (INT8)(get_bits(&s->gb, 8));

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

  192.                 get_bits(&s->gb, 11);

  193.                 code = 1;

  194.             }

  195.         } else {

  196.             code -= 128;

  197.         }

  198.     } else {

  199.         code = get_vlc(&s->gb, &rv_dc_chrom);

  200.         /* same remark */

  201.         if (code < 0) {

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

  203.             if (code == 0x1fc) {

  204.                 code = (INT8)(get_bits(&s->gb, 7) + 1);

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

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

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

  208.                 get_bits(&s->gb, 9);

  209.                 code = 1;

  210.             } else {

  211.                 return 0xffff;

  212.             }

  213.         } else {

  214.             code -= 128;

  215.         }

  216.     }

  217.     return -code;

  218. }

  219. 

  220. /* write RV 1.0 compatible frame header */

  221. void rv10_encode_picture_header(MpegEncContext *s, int picture_number)

  222. {

  223.     align_put_bits(&s->pb);

  224. 

  225.     put_bits(&s->pb, 1, 1);	/* marker */

  226. 

  227.     put_bits(&s->pb, 1, (s->pict_type == P_TYPE));

  228. 

  229.     put_bits(&s->pb, 1, 0);	/* not PB frame */

  230. 

  231.     put_bits(&s->pb, 5, s->qscale);

  232. 

  233.     if (s->pict_type == I_TYPE) {

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

  235.     }

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

  237.        to display the macro blocks is coded here */

  238.     put_bits(&s->pb, 6, 0);	/* mb_x */

  239.     put_bits(&s->pb, 6, 0);	/* mb_y */

  240.     put_bits(&s->pb, 12, s->mb_width * s->mb_height);

  241. 

  242.     put_bits(&s->pb, 3, 0);	/* ignored */

  243. }

  244. 

  245. static int get_num(GetBitContext *gb)

  246. {

  247.     int n, n1;

  248. 

  249.     n = get_bits(gb, 16);

  250.     if (n >= 0x4000) {

  251.         return n - 0x4000;

  252.     } else {

  253.         n1 = get_bits(gb, 16);

  254.         return (n << 16) | n1;

  255.     }

  256. }

  257. 

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

  259. static int rv10_decode_picture_header(MpegEncContext *s)

  260. {

  261.     int mb_count, pb_frame, marker, h, full_frame;

  262.     

  263.     /* skip packet header */

  264.     h = get_bits(&s->gb, 8);

  265.     if ((h & 0xc0) == 0xc0) {

  266.         int len, pos;

  267.         full_frame = 1;

  268.         len = get_num(&s->gb);

  269.         pos = get_num(&s->gb);

  270.     } else {

  271.         int seq, frame_size, pos;

  272.         full_frame = 0;

  273.         seq = get_bits(&s->gb, 8);

  274.         frame_size = get_num(&s->gb);

  275.         pos = get_num(&s->gb);

  276.     }

  277.     /* picture number */

  278.     get_bits(&s->gb, 8);

  279. 

  280.     marker = get_bits(&s->gb, 1);

  281. 

  282.     if (get_bits(&s->gb, 1))

  283.         s->pict_type = P_TYPE;

  284.     else

  285.         s->pict_type = I_TYPE;

  286. 

  287.     pb_frame = get_bits(&s->gb, 1);

  288. 

  289. #ifdef DEBUG

  290.     printf("pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);

  291. #endif

  292.     

  293.     if (pb_frame)

  294.         return -1;

  295. 

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

  297. 

  298.     if (s->pict_type == I_TYPE) {

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

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

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

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

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

  304. #ifdef DEBUG

  305.             printf("DC:%d %d %d\n",

  306.                    s->last_dc[0],

  307.                    s->last_dc[1],

  308.                    s->last_dc[2]);

  309. #endif

  310.         }

  311.     }

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

  313.        to display the macro blocks is coded here */

  314.     if (!full_frame) {

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

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

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

  318.     } else {

  319.         s->mb_x = 0;

  320.         s->mb_y = 0;

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

  322.     }

  323. 

  324.     get_bits(&s->gb, 3);	/* ignored */

  325.     s->f_code = 1;

  326.     s->unrestricted_mv = 1;

  327. #if 0

  328.     s->h263_long_vectors = 1;

  329. #endif

  330.     return mb_count;

  331. }

  332. 

  333. static int rv10_decode_init(AVCodecContext *avctx)

  334. {

  335.     MpegEncContext *s = avctx->priv_data;

  336.     static int done;

  337. 

  338. //    s->avctx= avctx;

  339.     s->out_format = FMT_H263;

  340. 

  341.     s->width = avctx->width;

  342.     s->height = avctx->height;

  343. 

  344.     s->h263_rv10 = 1;

  345.     s->rv10_version = avctx->sub_id;

  346. 

  347.     if (MPV_common_init(s) < 0)

  348.         return -1;

  349. 

  350.     h263_decode_init_vlc(s);

  351. 

  352.     /* init rv vlc */

  353.     if (!done) {

  354.         init_vlc(&rv_dc_lum, 9, 256, 

  355.                  rv_lum_bits, 1, 1,

  356.                  rv_lum_code, 2, 2);

  357.         init_vlc(&rv_dc_chrom, 9, 256, 

  358.                  rv_chrom_bits, 1, 1,

  359.                  rv_chrom_code, 2, 2);

  360.         done = 1;

  361.     }

  362. 

  363.     return 0;

  364. }

  365. 

  366. static int rv10_decode_end(AVCodecContext *avctx)

  367. {

  368.     MpegEncContext *s = avctx->priv_data;

  369. 

  370.     MPV_common_end(s);

  371.     return 0;

  372. }

  373. 

  374. static int rv10_decode_frame(AVCodecContext *avctx, 

  375.                              void *data, int *data_size,

  376.                              UINT8 *buf, int buf_size)

  377. {

  378.     MpegEncContext *s = avctx->priv_data;

  379.     int i, mb_count, mb_pos, left;

  380.     DCTELEM block[6][64];

  381.     AVPicture *pict = data; 

  382. 

  383. #ifdef DEBUG

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

  385. #endif

  386. 

  387.     /* no supplementary picture */

  388.     if (buf_size == 0) {

  389.         *data_size = 0;

  390.         return 0;

  391.     }

  392. 

  393.     init_get_bits(&s->gb, buf, buf_size);

  394. 

  395.     mb_count = rv10_decode_picture_header(s);

  396.     if (mb_count < 0) {

  397. #ifdef DEBUG

  398.         printf("HEADER ERROR\n");

  399. #endif

  400.         return -1;

  401.     }

  402.     

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

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

  405. #ifdef DEBUG

  406.         printf("POS ERROR %d %d\n", s->mb_x, s->mb_y);

  407. #endif

  408.         return -1;

  409.     }

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

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

  412.     if (mb_count > left) {

  413. #ifdef DEBUG

  414.         printf("COUNT ERROR\n");

  415. #endif

  416.         return -1;

  417.     }

  418. 

  419.     if (s->mb_x == 0 && s->mb_y == 0) {

  420.         MPV_frame_start(s);

  421.     }

  422. 

  423. #ifdef DEBUG

  424.     printf("qscale=%d\n", s->qscale);

  425. #endif

  426. 

  427.     /* default quantization values */

  428.     s->y_dc_scale = 8;

  429.     s->c_dc_scale = 8;

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

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

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

  433.     

  434.     /* decode each macroblock */

  435.     for(i=0;i<mb_count;i++) {

  436. #ifdef DEBUG

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

  438. #endif

  439.         

  440.         memset(block, 0, sizeof(block));

  441.         s->mv_dir = MV_DIR_FORWARD;

  442.         s->mv_type = MV_TYPE_16X16; 

  443.         if (h263_decode_mb(s, block) < 0) {

  444. #ifdef DEBUG

  445.             printf("ERROR\n");

  446. #endif

  447.             return -1;

  448.         }

  449.         MPV_decode_mb(s, block);

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

  451.             s->mb_x = 0;

  452.             s->mb_y++;

  453.         }

  454.     }

  455. 

  456.     if (s->mb_x == 0 &&

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

  458.         MPV_frame_end(s);

  459.         

  460.         pict->data[0] = s->current_picture[0];

  461.         pict->data[1] = s->current_picture[1];

  462.         pict->data[2] = s->current_picture[2];

  463.         pict->linesize[0] = s->linesize;

  464.         pict->linesize[1] = s->linesize / 2;

  465.         pict->linesize[2] = s->linesize / 2;

  466.         

  467.         avctx->quality = s->qscale;

  468.         *data_size = sizeof(AVPicture);

  469.     } else {

  470.         *data_size = 0;

  471.     }

  472.     return buf_size;

  473. }

  474. 

  475. AVCodec rv10_decoder = {

  476.     "rv10",

  477.     CODEC_TYPE_VIDEO,

  478.     CODEC_ID_RV10,

  479.     sizeof(MpegEncContext),

  480.     rv10_decode_init,

  481.     NULL,

  482.     rv10_decode_end,

  483.     rv10_decode_frame,

  484. };