libavcodec/rv10.c

   1 /*
   2  * RV10 codec
   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 rv10.c
  25  * RV10 codec.
  26  */
  27
  28 #include "avcodec.h"
  29 #include "dsputil.h"
  30 #include "mpegvideo.h"
  31
  32 //#define DEBUG
  33
  34 #define DC_VLC_BITS 14 //FIXME find a better solution
  35
  36 static const uint16_t rv_lum_code[256] =
  37 {
  38  0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,
  39  0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,
  40  0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,
  41  0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,
  42  0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,
  43  0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,
  44  0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,
  45  0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,
  46  0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,
  47  0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,
  48  0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,
  49  0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,
  50  0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,
  51  0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,
  52  0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,
  53  0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,
  54  0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,
  55  0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
  56  0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
  57  0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
  58  0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,
  59  0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,
  60  0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,
  61  0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,
  62  0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,
  63  0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,
  64  0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,
  65  0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,
  66  0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,
  67  0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,
  68  0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,
  69  0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,
  70 };
  71
  72 static const uint8_t rv_lum_bits[256] =
  73 {
  74  14, 12, 12, 12, 12, 12, 12, 12,
  75  12, 12, 12, 12, 12, 12, 12, 12,
  76  12, 12, 12, 12, 12, 12, 12, 12,
  77  12, 12, 12, 12, 12, 12, 12, 12,
  78  12, 12, 12, 12, 12, 12, 12, 12,
  79  12, 12, 12, 12, 12, 12, 12, 12,
  80  12, 12, 12, 12, 12, 12, 12, 12,
  81  12, 12, 12, 12, 12, 12, 12, 12,
  82  12, 10, 10, 10, 10, 10, 10, 10,
  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,  8,  8,  8,  8,  8,  8,  8,
  87   8,  8,  8,  8,  8,  8,  8,  8,
  88   8,  7,  7,  7,  7,  7,  7,  7,
  89   7,  6,  6,  6,  6,  5,  5,  4,
  90   2,  4,  5,  5,  6,  6,  6,  6,
  91   7,  7,  7,  7,  7,  7,  7,  7,
  92   8,  8,  8,  8,  8,  8,  8,  8,
  93   8,  8,  8,  8,  8,  8,  8,  8,
  94  10, 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  12, 12, 12, 12, 12, 12, 12, 12,
  99  12, 12, 12, 12, 12, 12, 12, 12,
 100  12, 12, 12, 12, 12, 12, 12, 12,
 101  12, 12, 12, 12, 12, 12, 12, 12,
 102  12, 12, 12, 12, 12, 12, 12, 12,
 103  12, 12, 12, 12, 12, 12, 12, 12,
 104  12, 12, 12, 12, 12, 12, 12, 12,
 105  12, 12, 12, 12, 12, 12, 12, 12,
 106 };
 107
 108 static const uint16_t rv_chrom_code[256] =
 109 {
 110  0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,
 111  0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,
 112  0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,
 113  0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,
 114  0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,
 115  0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,
 116  0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,
 117  0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,
 118  0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,
 119  0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,
 120  0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,
 121  0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,
 122  0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,
 123  0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,
 124  0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,
 125  0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,
 126  0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,
 127  0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
 128  0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,
 129  0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,
 130  0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,
 131  0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,
 132  0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,
 133  0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,
 134  0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,
 135  0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,
 136  0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,
 137  0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,
 138  0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,
 139  0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,
 140  0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,
 141  0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,
 142 };
 143
 144 static const uint8_t rv_chrom_bits[256] =
 145 {
 146  16, 14, 14, 14, 14, 14, 14, 14,
 147  14, 14, 14, 14, 14, 14, 14, 14,
 148  14, 14, 14, 14, 14, 14, 14, 14,
 149  14, 14, 14, 14, 14, 14, 14, 14,
 150  14, 14, 14, 14, 14, 14, 14, 14,
 151  14, 14, 14, 14, 14, 14, 14, 14,
 152  14, 14, 14, 14, 14, 14, 14, 14,
 153  14, 14, 14, 14, 14, 14, 14, 14,
 154  14, 12, 12, 12, 12, 12, 12, 12,
 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, 10, 10, 10, 10, 10, 10, 10,
 159  10, 10, 10, 10, 10, 10, 10, 10,
 160  10,  8,  8,  8,  8,  8,  8,  8,
 161   8,  6,  6,  6,  6,  4,  4,  3,
 162   2,  3,  4,  4,  6,  6,  6,  6,
 163   8,  8,  8,  8,  8,  8,  8,  8,
 164  10, 10, 10, 10, 10, 10, 10, 10,
 165  10, 10, 10, 10, 10, 10, 10, 10,
 166  12, 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  14, 14, 14, 14, 14, 14, 14, 14,
 171  14, 14, 14, 14, 14, 14, 14, 14,
 172  14, 14, 14, 14, 14, 14, 14, 14,
 173  14, 14, 14, 14, 14, 14, 14, 14,
 174  14, 14, 14, 14, 14, 14, 14, 14,
 175  14, 14, 14, 14, 14, 14, 14, 14,
 176  14, 14, 14, 14, 14, 14, 14, 14,
 177  14, 14, 14, 14, 14, 14, 14, 14,
 178 };
 179
 180 static VLC rv_dc_lum, rv_dc_chrom;
 181
 182 int rv_decode_dc(MpegEncContext *s, int n)
 183 {
 184     int code;
 185
 186     if (n < 4) {
 187         code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);
 188         if (code < 0) {
 189             /* XXX: I don't understand why they use LONGER codes than
 190                necessary. The following code would be completely useless
 191                if they had thought about it !!! */
 192             code = get_bits(&s->gb, 7);
 193             if (code == 0x7c) {
 194                 code = (int8_t)(get_bits(&s->gb, 7) + 1);
 195             } else if (code == 0x7d) {
 196                 code = -128 + get_bits(&s->gb, 7);
 197             } else if (code == 0x7e) {
 198                 if (get_bits1(&s->gb) == 0)
 199                     code = (int8_t)(get_bits(&s->gb, 8) + 1);
 200                 else
 201                     code = (int8_t)(get_bits(&s->gb, 8));
 202             } else if (code == 0x7f) {
 203                 skip_bits(&s->gb, 11);
 204                 code = 1;
 205             }
 206         } else {
 207             code -= 128;
 208         }
 209     } else {
 210         code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);
 211         /* same remark */
 212         if (code < 0) {
 213             code = get_bits(&s->gb, 9);
 214             if (code == 0x1fc) {
 215                 code = (int8_t)(get_bits(&s->gb, 7) + 1);
 216             } else if (code == 0x1fd) {
 217                 code = -128 + get_bits(&s->gb, 7);
 218             } else if (code == 0x1fe) {
 219                 skip_bits(&s->gb, 9);
 220                 code = 1;
 221             } else {
 222                 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");
 223                 return 0xffff;
 224             }
 225         } else {
 226             code -= 128;
 227         }
 228     }
 229     return -code;
 230 }
 231
 232 #ifdef CONFIG_ENCODERS
 233
 234 /* write RV 1.0 compatible frame header */
 235 void rv10_encode_picture_header(MpegEncContext *s, int picture_number)
 236 {
 237     int full_frame= 0;
 238
 239     align_put_bits(&s->pb);
 240
 241     put_bits(&s->pb, 1, 1);     /* marker */
 242
 243     put_bits(&s->pb, 1, (s->pict_type == FF_P_TYPE));
 244
 245     put_bits(&s->pb, 1, 0);     /* not PB frame */
 246
 247     put_bits(&s->pb, 5, s->qscale);
 248
 249     if (s->pict_type == FF_I_TYPE) {
 250         /* specific MPEG like DC coding not used */
 251     }
 252     /* if multiple packets per frame are sent, the position at which
 253        to display the macro blocks is coded here */
 254     if(!full_frame){
 255         put_bits(&s->pb, 6, 0); /* mb_x */
 256         put_bits(&s->pb, 6, 0); /* mb_y */
 257         put_bits(&s->pb, 12, s->mb_width * s->mb_height);
 258     }
 259
 260     put_bits(&s->pb, 3, 0);     /* ignored */
 261 }
 262
 263 void rv20_encode_picture_header(MpegEncContext *s, int picture_number){
 264     put_bits(&s->pb, 2, s->pict_type); //I 0 vs. 1 ?
 265     put_bits(&s->pb, 1, 0);     /* unknown bit */
 266     put_bits(&s->pb, 5, s->qscale);
 267
 268     put_bits(&s->pb, 8, picture_number&0xFF); //FIXME wrong, but correct is not known
 269     s->mb_x= s->mb_y= 0;
 270     ff_h263_encode_mba(s);
 271
 272     put_bits(&s->pb, 1, s->no_rounding);
 273
 274     assert(s->f_code == 1);
 275     assert(s->unrestricted_mv == 1);
 276 //    assert(s->h263_aic== (s->pict_type == FF_I_TYPE));
 277     assert(s->alt_inter_vlc == 0);
 278     assert(s->umvplus == 0);
 279     assert(s->modified_quant==1);
 280     assert(s->loop_filter==1);
 281
 282     s->h263_aic= s->pict_type == FF_I_TYPE;
 283     if(s->h263_aic){
 284         s->y_dc_scale_table=
 285         s->c_dc_scale_table= ff_aic_dc_scale_table;
 286     }else{
 287         s->y_dc_scale_table=
 288         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
 289     }
 290 }
 291
 292 #if 0 /* unused, remove? */
 293 static int get_num(GetBitContext *gb)
 294 {
 295     int n, n1;
 296
 297     n = get_bits(gb, 16);
 298     if (n >= 0x4000) {
 299         return n - 0x4000;
 300     } else {
 301         n1 = get_bits(gb, 16);
 302         return (n << 16) | n1;
 303     }
 304 }
 305 #endif
 306
 307 #endif //CONFIG_ENCODERS
 308
 309 /* read RV 1.0 compatible frame header */
 310 static int rv10_decode_picture_header(MpegEncContext *s)
 311 {
 312     int mb_count, pb_frame, marker, unk, mb_xy;
 313
 314 //printf("ff:%d\n", full_frame);
 315     marker = get_bits1(&s->gb);
 316
 317     if (get_bits1(&s->gb))
 318         s->pict_type = FF_P_TYPE;
 319     else
 320         s->pict_type = FF_I_TYPE;
 321 //printf("h:%X ver:%d\n",h,s->rv10_version);
 322     if(!marker) av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
 323     pb_frame = get_bits1(&s->gb);
 324
 325 #ifdef DEBUG
 326     av_log(s->avctx, AV_LOG_DEBUG, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);
 327 #endif
 328
 329     if (pb_frame){
 330         av_log(s->avctx, AV_LOG_ERROR, "pb frame not supported\n");
 331         return -1;
 332     }
 333
 334     s->qscale = get_bits(&s->gb, 5);
 335     if(s->qscale==0){
 336         av_log(s->avctx, AV_LOG_ERROR, "error, qscale:0\n");
 337         return -1;
 338     }
 339
 340     if (s->pict_type == FF_I_TYPE) {
 341         if (s->rv10_version == 3) {
 342             /* specific MPEG like DC coding not used */
 343             s->last_dc[0] = get_bits(&s->gb, 8);
 344             s->last_dc[1] = get_bits(&s->gb, 8);
 345             s->last_dc[2] = get_bits(&s->gb, 8);
 346 #ifdef DEBUG
 347             av_log(s->avctx, AV_LOG_DEBUG, "DC:%d %d %d\n",
 348                    s->last_dc[0],
 349                    s->last_dc[1],
 350                    s->last_dc[2]);
 351 #endif
 352         }
 353     }
 354     /* if multiple packets per frame are sent, the position at which
 355        to display the macro blocks is coded here */
 356
 357     mb_xy= s->mb_x + s->mb_y*s->mb_width;
 358     if(show_bits(&s->gb, 12)==0 || (mb_xy && mb_xy < s->mb_num)){
 359         s->mb_x = get_bits(&s->gb, 6); /* mb_x */
 360         s->mb_y = get_bits(&s->gb, 6); /* mb_y */
 361         mb_count = get_bits(&s->gb, 12);
 362     } else {
 363         s->mb_x = 0;
 364         s->mb_y = 0;
 365         mb_count = s->mb_width * s->mb_height;
 366     }
 367     unk= get_bits(&s->gb, 3);   /* ignored */
 368 //printf("%d\n", unk);
 369     s->f_code = 1;
 370     s->unrestricted_mv = 1;
 371
 372     return mb_count;
 373 }
 374
 375 static int rv20_decode_picture_header(MpegEncContext *s)
 376 {
 377     int seq, mb_pos, i;
 378
 379 #if 0
 380     GetBitContext gb= s->gb;
 381     for(i=0; i<64; i++){
 382         av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&gb));
 383         if(i%4==3) av_log(s->avctx, AV_LOG_DEBUG, " ");
 384     }
 385     av_log(s->avctx, AV_LOG_DEBUG, "\n");
 386 #endif
 387 #if 0
 388     av_log(s->avctx, AV_LOG_DEBUG, "%3dx%03d/%02Xx%02X ", s->width, s->height, s->width/4, s->height/4);
 389     for(i=0; i<s->avctx->extradata_size; i++){
 390         av_log(s->avctx, AV_LOG_DEBUG, "%02X ", ((uint8_t*)s->avctx->extradata)[i]);
 391         if(i%4==3) av_log(s->avctx, AV_LOG_DEBUG, " ");
 392     }
 393     av_log(s->avctx, AV_LOG_DEBUG, "\n");
 394 #endif
 395
 396     if(s->avctx->sub_id == 0x30202002 || s->avctx->sub_id == 0x30203002){
 397         if (get_bits(&s->gb, 3)){
 398             av_log(s->avctx, AV_LOG_ERROR, "unknown triplet set\n");
 399             return -1;
 400         }
 401     }
 402
 403     i= get_bits(&s->gb, 2);
 404     switch(i){
 405     case 0: s->pict_type= FF_I_TYPE; break;
 406     case 1: s->pict_type= FF_I_TYPE; break; //hmm ...
 407     case 2: s->pict_type= FF_P_TYPE; break;
 408     case 3: s->pict_type= FF_B_TYPE; break;
 409     default:
 410         av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n");
 411         return -1;
 412     }
 413
 414     if(s->last_picture_ptr==NULL && s->pict_type==FF_B_TYPE){
 415         av_log(s->avctx, AV_LOG_ERROR, "early B pix\n");
 416         return -1;
 417     }
 418
 419     if (get_bits1(&s->gb)){
 420         av_log(s->avctx, AV_LOG_ERROR, "unknown bit set\n");
 421         return -1;
 422     }
 423
 424     s->qscale = get_bits(&s->gb, 5);
 425     if(s->qscale==0){
 426         av_log(s->avctx, AV_LOG_ERROR, "error, qscale:0\n");
 427         return -1;
 428     }
 429     if(s->avctx->sub_id == 0x30203002){
 430         if (get_bits1(&s->gb)){
 431             av_log(s->avctx, AV_LOG_ERROR, "unknown bit2 set\n");
 432             return -1;
 433         }
 434     }
 435
 436     if(s->avctx->has_b_frames){
 437         int f, new_w, new_h;
 438         int v= s->avctx->extradata_size >= 4 ? 7&((uint8_t*)s->avctx->extradata)[1] : 0;
 439
 440         if (get_bits1(&s->gb)){
 441             av_log(s->avctx, AV_LOG_ERROR, "unknown bit3 set\n");
 442 //            return -1;
 443         }
 444         seq= get_bits(&s->gb, 13)<<2;
 445
 446         f= get_bits(&s->gb, av_log2(v)+1);
 447
 448         if(f){
 449             new_w= 4*((uint8_t*)s->avctx->extradata)[6+2*f];
 450             new_h= 4*((uint8_t*)s->avctx->extradata)[7+2*f];
 451         }else{
 452             new_w= s->width; //FIXME wrong we of course must save the original in the context
 453             new_h= s->height;
 454         }
 455         if(new_w != s->width || new_h != s->height){
 456             av_log(s->avctx, AV_LOG_DEBUG, "attempting to change resolution to %dx%d\n", new_w, new_h);
 457             if (avcodec_check_dimensions(s->avctx, new_h, new_w) < 0)
 458                 return -1;
 459             MPV_common_end(s);
 460             s->width  = s->avctx->width = new_w;
 461             s->height = s->avctx->height= new_h;
 462             if (MPV_common_init(s) < 0)
 463                 return -1;
 464         }
 465
 466         if(s->avctx->debug & FF_DEBUG_PICT_INFO){
 467             av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d\n", f, v);
 468         }
 469     }else{
 470         seq= get_bits(&s->gb, 8)*128;
 471     }
 472
 473 //     if(s->avctx->sub_id <= 0x20201002){ //0x20201002 definitely needs this
 474     mb_pos= ff_h263_decode_mba(s);
 475 /*    }else{
 476         mb_pos= get_bits(&s->gb, av_log2(s->mb_num-1)+1);
 477         s->mb_x= mb_pos % s->mb_width;
 478         s->mb_y= mb_pos / s->mb_width;
 479     }*/
 480 //av_log(s->avctx, AV_LOG_DEBUG, "%d\n", seq);
 481     seq |= s->time &~0x7FFF;
 482     if(seq - s->time >  0x4000) seq -= 0x8000;
 483     if(seq - s->time < -0x4000) seq += 0x8000;
 484     if(seq != s->time){
 485         if(s->pict_type!=FF_B_TYPE){
 486             s->time= seq;
 487             s->pp_time= s->time - s->last_non_b_time;
 488             s->last_non_b_time= s->time;
 489         }else{
 490             s->time= seq;
 491             s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
 492             if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
 493                 av_log(s->avctx, AV_LOG_DEBUG, "messed up order, possible from seeking? skipping current b frame\n");
 494                 return FRAME_SKIPPED;
 495             }
 496             ff_mpeg4_init_direct_mv(s);
 497         }
 498     }
 499 //    printf("%d %d %d %d %d\n", seq, (int)s->time, (int)s->last_non_b_time, s->pp_time, s->pb_time);
 500 /*for(i=0; i<32; i++){
 501     av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
 502 }
 503 av_log(s->avctx, AV_LOG_DEBUG, "\n");*/
 504     s->no_rounding= get_bits1(&s->gb);
 505
 506     s->f_code = 1;
 507     s->unrestricted_mv = 1;
 508     s->h263_aic= s->pict_type == FF_I_TYPE;
 509 //    s->alt_inter_vlc=1;
 510 //    s->obmc=1;
 511 //    s->umvplus=1;
 512     s->modified_quant=1;
 513     s->loop_filter=1;
 514
 515     if(s->avctx->debug & FF_DEBUG_PICT_INFO){
 516             av_log(s->avctx, AV_LOG_INFO, "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
 517                    seq, s->mb_x, s->mb_y, s->pict_type, s->qscale, s->no_rounding);
 518     }
 519
 520     assert(s->pict_type != FF_B_TYPE || !s->low_delay);
 521
 522     return s->mb_width*s->mb_height - mb_pos;
 523 }
 524
 525 static av_cold int rv10_decode_init(AVCodecContext *avctx)
 526 {
 527     MpegEncContext *s = avctx->priv_data;
 528     static int done=0;
 529
 530     MPV_decode_defaults(s);
 531
 532     s->avctx= avctx;
 533     s->out_format = FMT_H263;
 534     s->codec_id= avctx->codec_id;
 535
 536     s->width = avctx->width;
 537     s->height = avctx->height;
 538
 539     s->h263_long_vectors= ((uint8_t*)avctx->extradata)[3] & 1;
 540     avctx->sub_id= AV_RB32((uint8_t*)avctx->extradata + 4);
 541
 542     if (avctx->sub_id == 0x10000000) {
 543         s->rv10_version= 0;
 544         s->low_delay=1;
 545     } else if (avctx->sub_id == 0x10002000) {
 546         s->rv10_version= 3;
 547         s->low_delay=1;
 548         s->obmc=1;
 549     } else if (avctx->sub_id == 0x10003000) {
 550         s->rv10_version= 3;
 551         s->low_delay=1;
 552     } else if (avctx->sub_id == 0x10003001) {
 553         s->rv10_version= 3;
 554         s->low_delay=1;
 555     } else if (    avctx->sub_id == 0x20001000
 556                || (avctx->sub_id >= 0x20100000 && avctx->sub_id < 0x201a0000)) {
 557         s->low_delay=1;
 558     } else if (    avctx->sub_id == 0x30202002
 559                ||  avctx->sub_id == 0x30203002
 560                || (avctx->sub_id >= 0x20200002 && avctx->sub_id < 0x20300000)) {
 561         s->low_delay=0;
 562         s->avctx->has_b_frames=1;
 563     } else
 564         av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", avctx->sub_id);
 565
 566     if(avctx->debug & FF_DEBUG_PICT_INFO){
 567         av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%X\n", avctx->sub_id, avctx->extradata_size >= 4 ? ((uint32_t*)avctx->extradata)[0] : -1);
 568     }
 569
 570     avctx->pix_fmt = PIX_FMT_YUV420P;
 571
 572     if (MPV_common_init(s) < 0)
 573         return -1;
 574
 575     h263_decode_init_vlc(s);
 576
 577     /* init rv vlc */
 578     if (!done) {
 579         init_vlc(&rv_dc_lum, DC_VLC_BITS, 256,
 580                  rv_lum_bits, 1, 1,
 581                  rv_lum_code, 2, 2, 1);
 582         init_vlc(&rv_dc_chrom, DC_VLC_BITS, 256,
 583                  rv_chrom_bits, 1, 1,
 584                  rv_chrom_code, 2, 2, 1);
 585         done = 1;
 586     }
 587
 588     return 0;
 589 }
 590
 591 static av_cold int rv10_decode_end(AVCodecContext *avctx)
 592 {
 593     MpegEncContext *s = avctx->priv_data;
 594
 595     MPV_common_end(s);
 596     return 0;
 597 }
 598
 599 static int rv10_decode_packet(AVCodecContext *avctx,
 600                              const uint8_t *buf, int buf_size)
 601 {
 602     MpegEncContext *s = avctx->priv_data;
 603     int mb_count, mb_pos, left, start_mb_x;
 604
 605     init_get_bits(&s->gb, buf, buf_size*8);
 606     if(s->codec_id ==CODEC_ID_RV10)
 607         mb_count = rv10_decode_picture_header(s);
 608     else
 609         mb_count = rv20_decode_picture_header(s);
 610     if (mb_count < 0) {
 611         av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
 612         return -1;
 613     }
 614
 615     if (s->mb_x >= s->mb_width ||
 616         s->mb_y >= s->mb_height) {
 617         av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
 618         return -1;
 619     }
 620     mb_pos = s->mb_y * s->mb_width + s->mb_x;
 621     left = s->mb_width * s->mb_height - mb_pos;
 622     if (mb_count > left) {
 623         av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
 624         return -1;
 625     }
 626 //if(s->pict_type == FF_P_TYPE) return 0;
 627
 628     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {
 629         if(s->current_picture_ptr){ //FIXME write parser so we always have complete frames?
 630             ff_er_frame_end(s);
 631             MPV_frame_end(s);
 632             s->mb_x= s->mb_y = s->resync_mb_x = s->resync_mb_y= 0;
 633         }
 634         if(MPV_frame_start(s, avctx) < 0)
 635             return -1;
 636         ff_er_frame_start(s);
 637     }
 638
 639 #ifdef DEBUG
 640     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
 641 #endif
 642
 643     /* default quantization values */
 644     if(s->codec_id== CODEC_ID_RV10){
 645         if(s->mb_y==0) s->first_slice_line=1;
 646     }else{
 647         s->first_slice_line=1;
 648         s->resync_mb_x= s->mb_x;
 649     }
 650     start_mb_x= s->mb_x;
 651     s->resync_mb_y= s->mb_y;
 652     if(s->h263_aic){
 653         s->y_dc_scale_table=
 654         s->c_dc_scale_table= ff_aic_dc_scale_table;
 655     }else{
 656         s->y_dc_scale_table=
 657         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
 658     }
 659
 660     if(s->modified_quant)
 661         s->chroma_qscale_table= ff_h263_chroma_qscale_table;
 662
 663     ff_set_qscale(s, s->qscale);
 664
 665     s->rv10_first_dc_coded[0] = 0;
 666     s->rv10_first_dc_coded[1] = 0;
 667     s->rv10_first_dc_coded[2] = 0;
 668 //printf("%d %X %X\n", s->pict_type, s->current_picture.motion_val[0], s->current_picture.motion_val[1]);
 669     s->block_wrap[0]=
 670     s->block_wrap[1]=
 671     s->block_wrap[2]=
 672     s->block_wrap[3]= s->b8_stride;
 673     s->block_wrap[4]=
 674     s->block_wrap[5]= s->mb_stride;
 675     ff_init_block_index(s);
 676     /* decode each macroblock */
 677
 678     for(s->mb_num_left= mb_count; s->mb_num_left>0; s->mb_num_left--) {
 679         int ret;
 680         ff_update_block_index(s);
 681 #ifdef DEBUG
 682         av_log(avctx, AV_LOG_DEBUG, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
 683 #endif
 684
 685         s->mv_dir = MV_DIR_FORWARD;
 686         s->mv_type = MV_TYPE_16X16;
 687         ret=ff_h263_decode_mb(s, s->block);
 688
 689         if (ret == SLICE_ERROR || s->gb.size_in_bits < get_bits_count(&s->gb)) {
 690             av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x, s->mb_y);
 691             return -1;
 692         }
 693         if(s->pict_type != FF_B_TYPE)
 694             ff_h263_update_motion_val(s);
 695         MPV_decode_mb(s, s->block);
 696         if(s->loop_filter)
 697             ff_h263_loop_filter(s);
 698
 699         if (++s->mb_x == s->mb_width) {
 700             s->mb_x = 0;
 701             s->mb_y++;
 702             ff_init_block_index(s);
 703         }
 704         if(s->mb_x == s->resync_mb_x)
 705             s->first_slice_line=0;
 706         if(ret == SLICE_END) break;
 707     }
 708
 709     ff_er_add_slice(s, start_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
 710
 711     return buf_size;
 712 }
 713
 714 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
 715 {
 716     if(avctx->slice_count) return avctx->slice_offset[n];
 717     else                   return AV_RL32(buf + n*8);
 718 }
 719
 720 static int rv10_decode_frame(AVCodecContext *avctx,
 721                              void *data, int *data_size,
 722                              const uint8_t *buf, int buf_size)
 723 {
 724     MpegEncContext *s = avctx->priv_data;
 725     int i;
 726     AVFrame *pict = data;
 727     int slice_count;
 728     const uint8_t *slices_hdr = NULL;
 729
 730 #ifdef DEBUG
 731     av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
 732 #endif
 733
 734     /* no supplementary picture */
 735     if (buf_size == 0) {
 736         return 0;
 737     }
 738
 739     if(!avctx->slice_count){
 740         slice_count = (*buf++) + 1;
 741         slices_hdr = buf + 4;
 742         buf += 8 * slice_count;
 743     }else
 744         slice_count = avctx->slice_count;
 745
 746     for(i=0; i<slice_count; i++){
 747         int offset= get_slice_offset(avctx, slices_hdr, i);
 748         int size;
 749
 750         if(i+1 == slice_count)
 751             size= buf_size - offset;
 752         else
 753             size= get_slice_offset(avctx, slices_hdr, i+1) - offset;
 754
 755         rv10_decode_packet(avctx, buf+offset, size);
 756     }
 757
 758     if(s->current_picture_ptr != NULL && s->mb_y>=s->mb_height){
 759         ff_er_frame_end(s);
 760         MPV_frame_end(s);
 761
 762         if (s->pict_type == FF_B_TYPE || s->low_delay) {
 763             *pict= *(AVFrame*)s->current_picture_ptr;
 764         } else if (s->last_picture_ptr != NULL) {
 765             *pict= *(AVFrame*)s->last_picture_ptr;
 766         }
 767
 768         if(s->last_picture_ptr || s->low_delay){
 769             *data_size = sizeof(AVFrame);
 770             ff_print_debug_info(s, pict);
 771         }
 772         s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)
 773     }
 774
 775     return buf_size;
 776 }
 777
 778 AVCodec rv10_decoder = {
 779     "rv10",
 780     CODEC_TYPE_VIDEO,
 781     CODEC_ID_RV10,
 782     sizeof(MpegEncContext),
 783     rv10_decode_init,
 784     NULL,
 785     rv10_decode_end,
 786     rv10_decode_frame,
 787     CODEC_CAP_DR1,
 788     .long_name = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),
 789 };
 790
 791 AVCodec rv20_decoder = {
 792     "rv20",
 793     CODEC_TYPE_VIDEO,
 794     CODEC_ID_RV20,
 795     sizeof(MpegEncContext),
 796     rv10_decode_init,
 797     NULL,
 798     rv10_decode_end,
 799     rv10_decode_frame,
 800     CODEC_CAP_DR1 | CODEC_CAP_DELAY,
 801     .flush= ff_mpeg_flush,
 802     .long_name = NULL_IF_CONFIG_SMALL("RealVideo 2.0"),
 803 };
 804