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FFmpeg/libavcodec/rv10.c

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  1. /*

  2.  * RV10 codec

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

  4.  *

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

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

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

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library 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 GNU

  13.  * Lesser General Public License for more details.

  14.  *

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

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

  17.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  18.  */

  19. #include "avcodec.h"

  20. #include "dsputil.h"

  21. #include "mpegvideo.h"

  22. 

  23. //#define DEBUG

  24. 

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

  26. 

  27. static const uint16_t rv_lum_code[256] =

  28. {

  29.  0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,

  30.  0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,

  31.  0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,

  32.  0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,

  33.  0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,

  34.  0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,

  35.  0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,

  36.  0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,

  37.  0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,

  38.  0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,

  39.  0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,

  40.  0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,

  41.  0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,

  42.  0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,

  43.  0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,

  44.  0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,

  45.  0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,

  46.  0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

  47.  0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,

  48.  0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,

  49.  0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,

  50.  0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,

  51.  0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,

  52.  0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,

  53.  0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,

  54.  0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,

  55.  0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,

  56.  0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,

  57.  0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,

  58.  0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,

  59.  0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,

  60.  0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

  61. };

  62. 

  63. static const uint8_t rv_lum_bits[256] = 

  64. {

  65.  14, 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, 12, 12, 12, 12, 12, 12, 12,

  72.  12, 12, 12, 12, 12, 12, 12, 12,

  73.  12, 10, 10, 10, 10, 10, 10, 10,

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

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

  76.  10, 10, 10, 10, 10, 10, 10, 10,

  77.  10,  8,  8,  8,  8,  8,  8,  8,

  78.   8,  8,  8,  8,  8,  8,  8,  8,

  79.   8,  7,  7,  7,  7,  7,  7,  7,

  80.   7,  6,  6,  6,  6,  5,  5,  4,

  81.   2,  4,  5,  5,  6,  6,  6,  6,

  82.   7,  7,  7,  7,  7,  7,  7,  7,

  83.   8,  8,  8,  8,  8,  8,  8,  8,

  84.   8,  8,  8,  8,  8,  8,  8,  8,

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

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

  87.  10, 10, 10, 10, 10, 10, 10, 10,

  88.  10, 10, 10, 10, 10, 10, 10, 10,

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

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

  97. };

  98. 

  99. static const uint16_t rv_chrom_code[256] =

  100. {

  101.  0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,

  102.  0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,

  103.  0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,

  104.  0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,

  105.  0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,

  106.  0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,

  107.  0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,

  108.  0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,

  109.  0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,

  110.  0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,

  111.  0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,

  112.  0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,

  113.  0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,

  114.  0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,

  115.  0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,

  116.  0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,

  117.  0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,

  118.  0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,

  119.  0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,

  120.  0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,

  121.  0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,

  122.  0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,

  123.  0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,

  124.  0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,

  125.  0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,

  126.  0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,

  127.  0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,

  128.  0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,

  129.  0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,

  130.  0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,

  131.  0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,

  132.  0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

  133. };

  134. 

  135. static const uint8_t rv_chrom_bits[256] =

  136. {

  137.  16, 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, 14, 14, 14, 14, 14, 14, 14,

  144.  14, 14, 14, 14, 14, 14, 14, 14,

  145.  14, 12, 12, 12, 12, 12, 12, 12,

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

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

  148.  12, 12, 12, 12, 12, 12, 12, 12,

  149.  12, 10, 10, 10, 10, 10, 10, 10,

  150.  10, 10, 10, 10, 10, 10, 10, 10,

  151.  10,  8,  8,  8,  8,  8,  8,  8,

  152.   8,  6,  6,  6,  6,  4,  4,  3,

  153.   2,  3,  4,  4,  6,  6,  6,  6,

  154.   8,  8,  8,  8,  8,  8,  8,  8,

  155.  10, 10, 10, 10, 10, 10, 10, 10,

  156.  10, 10, 10, 10, 10, 10, 10, 10,

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

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

  159.  12, 12, 12, 12, 12, 12, 12, 12,

  160.  12, 12, 12, 12, 12, 12, 12, 12,

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

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

  169. };

  170. 

  171. static VLC rv_dc_lum, rv_dc_chrom;

  172. 

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

  174. {

  175.     int code;

  176. 

  177.     if (n < 4) {

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

  179.         if (code < 0) {

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

  181.                necessary. The following code would be completely useless

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

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

  184.             if (code == 0x7c) {

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

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

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

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

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

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

  191.                 else

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

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

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

  195.                 code = 1;

  196.             }

  197.         } else {

  198.             code -= 128;

  199.         }

  200.     } else {

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

  202.         /* same remark */

  203.         if (code < 0) {

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

  205.             if (code == 0x1fc) {

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

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

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

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

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

  211.                 code = 1;

  212.             } else {

  213.                 fprintf(stderr, "chroma dc error\n");

  214.                 return 0xffff;

  215.             }

  216.         } else {

  217.             code -= 128;

  218.         }

  219.     }

  220.     return -code;

  221. }

  222. 

  223. #ifdef CONFIG_ENCODERS

  224. 

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

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

  227. {

  228.     int full_frame= 0;

  229. 

  230.     align_put_bits(&s->pb);

  231.     

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

  233. 

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

  235. 

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

  237. 

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

  239. 

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

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

  242.     }

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

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

  245.     if(!full_frame){

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

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

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

  249.     }

  250. 

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

  252. }

  253. 

  254. static int get_num(GetBitContext *gb)

  255. {

  256.     int n, n1;

  257. 

  258.     n = get_bits(gb, 16);

  259.     if (n >= 0x4000) {

  260.         return n - 0x4000;

  261.     } else {

  262.         n1 = get_bits(gb, 16);

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

  264.     }

  265. }

  266. 

  267. #endif //CONFIG_ENCODERS

  268. 

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

  270. static int rv10_decode_picture_header(MpegEncContext *s)

  271. {

  272.     int mb_count, pb_frame, marker, full_frame, unk;

  273.     

  274.     full_frame= s->avctx->slice_count==1;

  275. //printf("ff:%d\n", full_frame);

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

  277. 

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

  279.         s->pict_type = P_TYPE;

  280.     else

  281.         s->pict_type = I_TYPE;

  282. //printf("h:%X ver:%d\n",h,s->rv10_version);

  283.     if(!marker) printf("marker missing\n");

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

  285. 

  286. #ifdef DEBUG

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

  288. #endif

  289.     

  290.     if (pb_frame){

  291.         fprintf(stderr, "pb frame not supported\n");

  292.         return -1;

  293.     }

  294. 

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

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

  297.         fprintf(stderr, "error, qscale:0\n");

  298.         return -1;

  299.     }

  300. 

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

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

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

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

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

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

  307. #ifdef DEBUG

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

  309.                    s->last_dc[0],

  310.                    s->last_dc[1],

  311.                    s->last_dc[2]);

  312. #endif

  313.         }

  314.     }

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

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

  317.     if ((!full_frame) || show_bits(&s->gb, 12)==0) {

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

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

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

  321.     } else {

  322.         s->mb_x = 0;

  323.         s->mb_y = 0;

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

  325.     }

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

  327. //printf("%d\n", unk);

  328.     s->f_code = 1;

  329.     s->unrestricted_mv = 1;

  330. 

  331.     return mb_count;

  332. }

  333. 

  334. static int rv10_decode_init(AVCodecContext *avctx)

  335. {

  336.     MpegEncContext *s = avctx->priv_data;

  337.     static int done=0;

  338. 

  339.     s->avctx= avctx;

  340.     s->out_format = FMT_H263;

  341. 

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

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

  344. 

  345.     s->h263_rv10 = 1;

  346.     switch(avctx->sub_id){

  347.     case 0x10000000:

  348.         s->rv10_version= 0;

  349.         s->h263_long_vectors=0;

  350.         break;

  351.     case 0x10003000:

  352.         s->rv10_version= 3;

  353.         s->h263_long_vectors=1;

  354.         break;

  355.     case 0x10003001:

  356.         s->rv10_version= 3;

  357.         s->h263_long_vectors=0;

  358.         break;

  359.     default:

  360.         fprintf(stderr, "unknown header %X\n", avctx->sub_id);

  361.     }

  362. //printf("ver:%X\n", avctx->sub_id);

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

  364. 

  365.     if (MPV_common_init(s) < 0)

  366.         return -1;

  367. 

  368.     h263_decode_init_vlc(s);

  369. 

  370.     s->y_dc_scale_table=

  371.     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;

  372.     s->progressive_sequence=1;

  373. 

  374.     /* init rv vlc */

  375.     if (!done) {

  376.         init_vlc(&rv_dc_lum, DC_VLC_BITS, 256, 

  377.                  rv_lum_bits, 1, 1,

  378.                  rv_lum_code, 2, 2);

  379.         init_vlc(&rv_dc_chrom, DC_VLC_BITS, 256, 

  380.                  rv_chrom_bits, 1, 1,

  381.                  rv_chrom_code, 2, 2);

  382.         done = 1;

  383.     }

  384. 

  385.     return 0;

  386. }

  387. 

  388. static int rv10_decode_end(AVCodecContext *avctx)

  389. {

  390.     MpegEncContext *s = avctx->priv_data;

  391. 

  392.     MPV_common_end(s);

  393.     return 0;

  394. }

  395. 

  396. static int rv10_decode_packet(AVCodecContext *avctx, 

  397.                              uint8_t *buf, int buf_size)

  398. {

  399.     MpegEncContext *s = avctx->priv_data;

  400.     int i, mb_count, mb_pos, left;

  401. 

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

  403.     

  404.     mb_count = rv10_decode_picture_header(s);

  405.     if (mb_count < 0) {

  406.         fprintf(stderr, "HEADER ERROR\n");

  407.         return -1;

  408.     }

  409.     

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

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

  412.         fprintf(stderr, "POS ERROR %d %d\n", s->mb_x, s->mb_y);

  413.         return -1;

  414.     }

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

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

  417.     if (mb_count > left) {

  418.         fprintf(stderr, "COUNT ERROR\n");

  419.         return -1;

  420.     }

  421. 

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

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

  424.             return -1;

  425.     }

  426. 

  427. #ifdef DEBUG

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

  429. #endif

  430. 

  431.     /* default quantization values */

  432.     s->y_dc_scale = 8;

  433.     s->c_dc_scale = 8;

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

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

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

  437. 

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

  439.     

  440.     s->block_wrap[0]=

  441.     s->block_wrap[1]=

  442.     s->block_wrap[2]=

  443.     s->block_wrap[3]= s->mb_width*2 + 2;

  444.     s->block_wrap[4]=

  445.     s->block_wrap[5]= s->mb_width + 2;

  446.     ff_init_block_index(s);

  447.     /* decode each macroblock */

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

  449.         ff_update_block_index(s);

  450. #ifdef DEBUG

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

  452. #endif

  453.         

  454. 	s->dsp.clear_blocks(s->block[0]);

  455.         s->mv_dir = MV_DIR_FORWARD;

  456.         s->mv_type = MV_TYPE_16X16; 

  457.         if (ff_h263_decode_mb(s, s->block) == SLICE_ERROR) {

  458.             fprintf(stderr, "ERROR at MB %d %d\n", s->mb_x, s->mb_y);

  459.             return -1;

  460.         }

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

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

  463.             s->mb_x = 0;

  464.             s->mb_y++;

  465.             ff_init_block_index(s);

  466.             s->first_slice_line=0;

  467.         }

  468.     }

  469. 

  470.     return buf_size;

  471. }

  472. 

  473. static int rv10_decode_frame(AVCodecContext *avctx, 

  474.                              void *data, int *data_size,

  475.                              uint8_t *buf, int buf_size)

  476. {

  477.     MpegEncContext *s = avctx->priv_data;

  478.     int i;

  479.     AVFrame *pict = data; 

  480. 

  481. #ifdef DEBUG

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

  483. #endif

  484. 

  485.     /* no supplementary picture */

  486.     if (buf_size == 0) {

  487.         *data_size = 0;

  488.         return 0;

  489.     }

  490.     

  491.     if(avctx->slice_count){

  492.         for(i=0; i<avctx->slice_count; i++){

  493.             int offset= avctx->slice_offset[i];

  494.             int size;

  495.             

  496.             if(i+1 == avctx->slice_count)

  497.                 size= buf_size - offset;

  498.             else

  499.                 size= avctx->slice_offset[i+1] - offset;

  500. 

  501.             if( rv10_decode_packet(avctx, buf+offset, size) < 0 )

  502.                 return -1;

  503.         }

  504.     }else{

  505.         if( rv10_decode_packet(avctx, buf, buf_size) < 0 )

  506.             return -1;

  507.     }

  508. 

  509.     if(s->mb_y>=s->mb_height){

  510.         MPV_frame_end(s);

  511.         

  512.         *pict= *(AVFrame*)&s->current_picture;

  513.     

  514.         *data_size = sizeof(AVFrame);

  515.     }else{

  516.         *data_size = 0;

  517.     }

  518. 

  519.     return buf_size;

  520. }

  521. 

  522. AVCodec rv10_decoder = {

  523.     "rv10",

  524.     CODEC_TYPE_VIDEO,

  525.     CODEC_ID_RV10,

  526.     sizeof(MpegEncContext),

  527.     rv10_decode_init,

  528.     NULL,

  529.     rv10_decode_end,

  530.     rv10_decode_frame,

  531.     CODEC_CAP_DR1

  532. };