libavcodec/vc1.c

   1 /*
   2  * VC-1 and WMV3 decoder common code
   3  * Copyright (c) 2006-2007 Konstantin Shishkov
   4  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, 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 libavcodec/vc1.c
  25  * VC-1 and WMV3 decoder common code
  26  *
  27  */
  28 #include "internal.h"
  29 #include "dsputil.h"
  30 #include "avcodec.h"
  31 #include "mpegvideo.h"
  32 #include "vc1.h"
  33 #include "vc1data.h"
  34 #include "msmpeg4data.h"
  35 #include "unary.h"
  36 #include "simple_idct.h"
  37
  38 #undef NDEBUG
  39 #include <assert.h>
  40
  41 /***********************************************************************/
  42 /**
  43  * @defgroup vc1bitplane VC-1 Bitplane decoding
  44  * @see 8.7, p56
  45  * @{
  46  */
  47
  48 /**
  49  * Imode types
  50  * @{
  51  */
  52 enum Imode {
  53     IMODE_RAW,
  54     IMODE_NORM2,
  55     IMODE_DIFF2,
  56     IMODE_NORM6,
  57     IMODE_DIFF6,
  58     IMODE_ROWSKIP,
  59     IMODE_COLSKIP
  60 };
  61 /** @} */ //imode defines
  62
  63 /** Decode rows by checking if they are skipped
  64  * @param plane Buffer to store decoded bits
  65  * @param[in] width Width of this buffer
  66  * @param[in] height Height of this buffer
  67  * @param[in] stride of this buffer
  68  */
  69 static void decode_rowskip(uint8_t* plane, int width, int height, int stride, GetBitContext *gb){
  70     int x, y;
  71
  72     for (y=0; y<height; y++){
  73         if (!get_bits1(gb)) //rowskip
  74             memset(plane, 0, width);
  75         else
  76             for (x=0; x<width; x++)
  77                 plane[x] = get_bits1(gb);
  78         plane += stride;
  79     }
  80 }
  81
  82 /** Decode columns by checking if they are skipped
  83  * @param plane Buffer to store decoded bits
  84  * @param[in] width Width of this buffer
  85  * @param[in] height Height of this buffer
  86  * @param[in] stride of this buffer
  87  * @todo FIXME: Optimize
  88  */
  89 static void decode_colskip(uint8_t* plane, int width, int height, int stride, GetBitContext *gb){
  90     int x, y;
  91
  92     for (x=0; x<width; x++){
  93         if (!get_bits1(gb)) //colskip
  94             for (y=0; y<height; y++)
  95                 plane[y*stride] = 0;
  96         else
  97             for (y=0; y<height; y++)
  98                 plane[y*stride] = get_bits1(gb);
  99         plane ++;
 100     }
 101 }
 102
 103 /** Decode a bitplane's bits
 104  * @param data bitplane where to store the decode bits
 105  * @param[out] raw_flag pointer to the flag indicating that this bitplane is not coded explicitly
 106  * @param v VC-1 context for bit reading and logging
 107  * @return Status
 108  * @todo FIXME: Optimize
 109  */
 110 static int bitplane_decoding(uint8_t* data, int *raw_flag, VC1Context *v)
 111 {
 112     GetBitContext *gb = &v->s.gb;
 113
 114     int imode, x, y, code, offset;
 115     uint8_t invert, *planep = data;
 116     int width, height, stride;
 117
 118     width = v->s.mb_width;
 119     height = v->s.mb_height;
 120     stride = v->s.mb_stride;
 121     invert = get_bits1(gb);
 122     imode = get_vlc2(gb, ff_vc1_imode_vlc.table, VC1_IMODE_VLC_BITS, 1);
 123
 124     *raw_flag = 0;
 125     switch (imode)
 126     {
 127     case IMODE_RAW:
 128         //Data is actually read in the MB layer (same for all tests == "raw")
 129         *raw_flag = 1; //invert ignored
 130         return invert;
 131     case IMODE_DIFF2:
 132     case IMODE_NORM2:
 133         if ((height * width) & 1)
 134         {
 135             *planep++ = get_bits1(gb);
 136             offset = 1;
 137         }
 138         else offset = 0;
 139         // decode bitplane as one long line
 140         for (y = offset; y < height * width; y += 2) {
 141             code = get_vlc2(gb, ff_vc1_norm2_vlc.table, VC1_NORM2_VLC_BITS, 1);
 142             *planep++ = code & 1;
 143             offset++;
 144             if(offset == width) {
 145                 offset = 0;
 146                 planep += stride - width;
 147             }
 148             *planep++ = code >> 1;
 149             offset++;
 150             if(offset == width) {
 151                 offset = 0;
 152                 planep += stride - width;
 153             }
 154         }
 155         break;
 156     case IMODE_DIFF6:
 157     case IMODE_NORM6:
 158         if(!(height % 3) && (width % 3)) { // use 2x3 decoding
 159             for(y = 0; y < height; y+= 3) {
 160                 for(x = width & 1; x < width; x += 2) {
 161                     code = get_vlc2(gb, ff_vc1_norm6_vlc.table, VC1_NORM6_VLC_BITS, 2);
 162                     if(code < 0){
 163                         av_log(v->s.avctx, AV_LOG_DEBUG, "invalid NORM-6 VLC\n");
 164                         return -1;
 165                     }
 166                     planep[x + 0] = (code >> 0) & 1;
 167                     planep[x + 1] = (code >> 1) & 1;
 168                     planep[x + 0 + stride] = (code >> 2) & 1;
 169                     planep[x + 1 + stride] = (code >> 3) & 1;
 170                     planep[x + 0 + stride * 2] = (code >> 4) & 1;
 171                     planep[x + 1 + stride * 2] = (code >> 5) & 1;
 172                 }
 173                 planep += stride * 3;
 174             }
 175             if(width & 1) decode_colskip(data, 1, height, stride, &v->s.gb);
 176         } else { // 3x2
 177             planep += (height & 1) * stride;
 178             for(y = height & 1; y < height; y += 2) {
 179                 for(x = width % 3; x < width; x += 3) {
 180                     code = get_vlc2(gb, ff_vc1_norm6_vlc.table, VC1_NORM6_VLC_BITS, 2);
 181                     if(code < 0){
 182                         av_log(v->s.avctx, AV_LOG_DEBUG, "invalid NORM-6 VLC\n");
 183                         return -1;
 184                     }
 185                     planep[x + 0] = (code >> 0) & 1;
 186                     planep[x + 1] = (code >> 1) & 1;
 187                     planep[x + 2] = (code >> 2) & 1;
 188                     planep[x + 0 + stride] = (code >> 3) & 1;
 189                     planep[x + 1 + stride] = (code >> 4) & 1;
 190                     planep[x + 2 + stride] = (code >> 5) & 1;
 191                 }
 192                 planep += stride * 2;
 193             }
 194             x = width % 3;
 195             if(x) decode_colskip(data  ,             x, height    , stride, &v->s.gb);
 196             if(height & 1) decode_rowskip(data+x, width - x, 1, stride, &v->s.gb);
 197         }
 198         break;
 199     case IMODE_ROWSKIP:
 200         decode_rowskip(data, width, height, stride, &v->s.gb);
 201         break;
 202     case IMODE_COLSKIP:
 203         decode_colskip(data, width, height, stride, &v->s.gb);
 204         break;
 205     default: break;
 206     }
 207
 208     /* Applying diff operator */
 209     if (imode == IMODE_DIFF2 || imode == IMODE_DIFF6)
 210     {
 211         planep = data;
 212         planep[0] ^= invert;
 213         for (x=1; x<width; x++)
 214             planep[x] ^= planep[x-1];
 215         for (y=1; y<height; y++)
 216         {
 217             planep += stride;
 218             planep[0] ^= planep[-stride];
 219             for (x=1; x<width; x++)
 220             {
 221                 if (planep[x-1] != planep[x-stride]) planep[x] ^= invert;
 222                 else                                 planep[x] ^= planep[x-1];
 223             }
 224         }
 225     }
 226     else if (invert)
 227     {
 228         planep = data;
 229         for (x=0; x<stride*height; x++) planep[x] = !planep[x]; //FIXME stride
 230     }
 231     return (imode<<1) + invert;
 232 }
 233
 234 /** @} */ //Bitplane group
 235
 236 /***********************************************************************/
 237 /** VOP Dquant decoding
 238  * @param v VC-1 Context
 239  */
 240 static int vop_dquant_decoding(VC1Context *v)
 241 {
 242     GetBitContext *gb = &v->s.gb;
 243     int pqdiff;
 244
 245     //variable size
 246     if (v->dquant == 2)
 247     {
 248         pqdiff = get_bits(gb, 3);
 249         if (pqdiff == 7) v->altpq = get_bits(gb, 5);
 250         else v->altpq = v->pq + pqdiff + 1;
 251     }
 252     else
 253     {
 254         v->dquantfrm = get_bits1(gb);
 255         if ( v->dquantfrm )
 256         {
 257             v->dqprofile = get_bits(gb, 2);
 258             switch (v->dqprofile)
 259             {
 260             case DQPROFILE_SINGLE_EDGE:
 261             case DQPROFILE_DOUBLE_EDGES:
 262                 v->dqsbedge = get_bits(gb, 2);
 263                 break;
 264             case DQPROFILE_ALL_MBS:
 265                 v->dqbilevel = get_bits1(gb);
 266                 if(!v->dqbilevel)
 267                     v->halfpq = 0;
 268             default: break; //Forbidden ?
 269             }
 270             if (v->dqbilevel || v->dqprofile != DQPROFILE_ALL_MBS)
 271             {
 272                 pqdiff = get_bits(gb, 3);
 273                 if (pqdiff == 7) v->altpq = get_bits(gb, 5);
 274                 else v->altpq = v->pq + pqdiff + 1;
 275             }
 276         }
 277     }
 278     return 0;
 279 }
 280
 281 static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb);
 282
 283 /**
 284  * Decode Simple/Main Profiles sequence header
 285  * @see Figure 7-8, p16-17
 286  * @param avctx Codec context
 287  * @param gb GetBit context initialized from Codec context extra_data
 288  * @return Status
 289  */
 290 int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
 291 {
 292     av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits(gb, 32));
 293     v->profile = get_bits(gb, 2);
 294     if (v->profile == PROFILE_COMPLEX)
 295     {
 296         av_log(avctx, AV_LOG_ERROR, "WMV3 Complex Profile is not fully supported\n");
 297     }
 298
 299     if (v->profile == PROFILE_ADVANCED)
 300     {
 301         v->zz_8x4 = ff_vc1_adv_progressive_8x4_zz;
 302         v->zz_4x8 = ff_vc1_adv_progressive_4x8_zz;
 303         return decode_sequence_header_adv(v, gb);
 304     }
 305     else
 306     {
 307         v->zz_8x4 = wmv2_scantableA;
 308         v->zz_4x8 = wmv2_scantableB;
 309         v->res_sm = get_bits(gb, 2); //reserved
 310         if (v->res_sm)
 311         {
 312             av_log(avctx, AV_LOG_ERROR,
 313                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);
 314             return -1;
 315         }
 316     }
 317
 318     // (fps-2)/4 (->30)
 319     v->frmrtq_postproc = get_bits(gb, 3); //common
 320     // (bitrate-32kbps)/64kbps
 321     v->bitrtq_postproc = get_bits(gb, 5); //common
 322     v->s.loop_filter = get_bits1(gb); //common
 323     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)
 324     {
 325         av_log(avctx, AV_LOG_ERROR,
 326                "LOOPFILTER shall not be enabled in Simple Profile\n");
 327     }
 328     if(v->s.avctx->skip_loop_filter >= AVDISCARD_ALL)
 329         v->s.loop_filter = 0;
 330
 331     v->res_x8 = get_bits1(gb); //reserved
 332     v->multires = get_bits1(gb);
 333     v->res_fasttx = get_bits1(gb);
 334     if (!v->res_fasttx)
 335     {
 336         v->s.dsp.vc1_inv_trans_8x8 = ff_simple_idct;
 337         v->s.dsp.vc1_inv_trans_8x4 = ff_simple_idct84_add;
 338         v->s.dsp.vc1_inv_trans_4x8 = ff_simple_idct48_add;
 339         v->s.dsp.vc1_inv_trans_4x4 = ff_simple_idct44_add;
 340         v->s.dsp.vc1_inv_trans_8x8_dc = ff_simple_idct_add;
 341         v->s.dsp.vc1_inv_trans_8x4_dc = ff_simple_idct84_add;
 342         v->s.dsp.vc1_inv_trans_4x8_dc = ff_simple_idct48_add;
 343         v->s.dsp.vc1_inv_trans_4x4_dc = ff_simple_idct44_add;
 344     }
 345
 346     v->fastuvmc =  get_bits1(gb); //common
 347     if (!v->profile && !v->fastuvmc)
 348     {
 349         av_log(avctx, AV_LOG_ERROR,
 350                "FASTUVMC unavailable in Simple Profile\n");
 351         return -1;
 352     }
 353     v->extended_mv =  get_bits1(gb); //common
 354     if (!v->profile && v->extended_mv)
 355     {
 356         av_log(avctx, AV_LOG_ERROR,
 357                "Extended MVs unavailable in Simple Profile\n");
 358         return -1;
 359     }
 360     v->dquant =  get_bits(gb, 2); //common
 361     v->vstransform =  get_bits1(gb); //common
 362
 363     v->res_transtab = get_bits1(gb);
 364     if (v->res_transtab)
 365     {
 366         av_log(avctx, AV_LOG_ERROR,
 367                "1 for reserved RES_TRANSTAB is forbidden\n");
 368         return -1;
 369     }
 370
 371     v->overlap = get_bits1(gb); //common
 372
 373     v->s.resync_marker = get_bits1(gb);
 374     v->rangered = get_bits1(gb);
 375     if (v->rangered && v->profile == PROFILE_SIMPLE)
 376     {
 377         av_log(avctx, AV_LOG_INFO,
 378                "RANGERED should be set to 0 in Simple Profile\n");
 379     }
 380
 381     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common
 382     v->quantizer_mode = get_bits(gb, 2); //common
 383
 384     v->finterpflag = get_bits1(gb); //common
 385     v->res_rtm_flag = get_bits1(gb); //reserved
 386     if (!v->res_rtm_flag)
 387     {
 388 //            av_log(avctx, AV_LOG_ERROR,
 389 //                   "0 for reserved RES_RTM_FLAG is forbidden\n");
 390         av_log(avctx, AV_LOG_ERROR,
 391                "Old WMV3 version detected, only I-frames will be decoded\n");
 392         //return -1;
 393     }
 394     //TODO: figure out what they mean (always 0x402F)
 395     if(!v->res_fasttx) skip_bits(gb, 16);
 396     av_log(avctx, AV_LOG_DEBUG,
 397                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"
 398                "LoopFilter=%i, MultiRes=%i, FastUVMC=%i, Extended MV=%i\n"
 399                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"
 400                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",
 401                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,
 402                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,
 403                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,
 404                v->dquant, v->quantizer_mode, avctx->max_b_frames
 405                );
 406     return 0;
 407 }
 408
 409 static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
 410 {
 411     v->res_rtm_flag = 1;
 412     v->level = get_bits(gb, 3);
 413     if(v->level >= 5)
 414     {
 415         av_log(v->s.avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);
 416     }
 417     v->chromaformat = get_bits(gb, 2);
 418     if (v->chromaformat != 1)
 419     {
 420         av_log(v->s.avctx, AV_LOG_ERROR,
 421                "Only 4:2:0 chroma format supported\n");
 422         return -1;
 423     }
 424
 425     // (fps-2)/4 (->30)
 426     v->frmrtq_postproc = get_bits(gb, 3); //common
 427     // (bitrate-32kbps)/64kbps
 428     v->bitrtq_postproc = get_bits(gb, 5); //common
 429     v->postprocflag = get_bits1(gb); //common
 430
 431     v->s.avctx->coded_width = (get_bits(gb, 12) + 1) << 1;
 432     v->s.avctx->coded_height = (get_bits(gb, 12) + 1) << 1;
 433     v->s.avctx->width = v->s.avctx->coded_width;
 434     v->s.avctx->height = v->s.avctx->coded_height;
 435     v->broadcast = get_bits1(gb);
 436     v->interlace = get_bits1(gb);
 437     v->tfcntrflag = get_bits1(gb);
 438     v->finterpflag = get_bits1(gb);
 439     skip_bits1(gb); // reserved
 440
 441     v->s.h_edge_pos = v->s.avctx->coded_width;
 442     v->s.v_edge_pos = v->s.avctx->coded_height;
 443
 444     av_log(v->s.avctx, AV_LOG_DEBUG,
 445                "Advanced Profile level %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"
 446                "LoopFilter=%i, ChromaFormat=%i, Pulldown=%i, Interlace: %i\n"
 447                "TFCTRflag=%i, FINTERPflag=%i\n",
 448                v->level, v->frmrtq_postproc, v->bitrtq_postproc,
 449                v->s.loop_filter, v->chromaformat, v->broadcast, v->interlace,
 450                v->tfcntrflag, v->finterpflag
 451                );
 452
 453     v->psf = get_bits1(gb);
 454     if(v->psf) { //PsF, 6.1.13
 455         av_log(v->s.avctx, AV_LOG_ERROR, "Progressive Segmented Frame mode: not supported (yet)\n");
 456         return -1;
 457     }
 458     v->s.max_b_frames = v->s.avctx->max_b_frames = 7;
 459     if(get_bits1(gb)) { //Display Info - decoding is not affected by it
 460         int w, h, ar = 0;
 461         av_log(v->s.avctx, AV_LOG_DEBUG, "Display extended info:\n");
 462         v->s.avctx->width  = w = get_bits(gb, 14) + 1;
 463         v->s.avctx->height = h = get_bits(gb, 14) + 1;
 464         av_log(v->s.avctx, AV_LOG_DEBUG, "Display dimensions: %ix%i\n", w, h);
 465         if(get_bits1(gb))
 466             ar = get_bits(gb, 4);
 467         if(ar && ar < 14){
 468             v->s.avctx->sample_aspect_ratio = ff_vc1_pixel_aspect[ar];
 469         }else if(ar == 15){
 470             w = get_bits(gb, 8);
 471             h = get_bits(gb, 8);
 472             v->s.avctx->sample_aspect_ratio = (AVRational){w, h};
 473         }
 474         av_log(v->s.avctx, AV_LOG_DEBUG, "Aspect: %i:%i\n", v->s.avctx->sample_aspect_ratio.num, v->s.avctx->sample_aspect_ratio.den);
 475
 476         if(get_bits1(gb)){ //framerate stuff
 477             if(get_bits1(gb)) {
 478                 v->s.avctx->time_base.num = 32;
 479                 v->s.avctx->time_base.den = get_bits(gb, 16) + 1;
 480             } else {
 481                 int nr, dr;
 482                 nr = get_bits(gb, 8);
 483                 dr = get_bits(gb, 4);
 484                 if(nr && nr < 8 && dr && dr < 3){
 485                     v->s.avctx->time_base.num = ff_vc1_fps_dr[dr - 1];
 486                     v->s.avctx->time_base.den = ff_vc1_fps_nr[nr - 1] * 1000;
 487                 }
 488             }
 489         }
 490
 491         if(get_bits1(gb)){
 492             v->color_prim = get_bits(gb, 8);
 493             v->transfer_char = get_bits(gb, 8);
 494             v->matrix_coef = get_bits(gb, 8);
 495         }
 496     }
 497
 498     v->hrd_param_flag = get_bits1(gb);
 499     if(v->hrd_param_flag) {
 500         int i;
 501         v->hrd_num_leaky_buckets = get_bits(gb, 5);
 502         skip_bits(gb, 4); //bitrate exponent
 503         skip_bits(gb, 4); //buffer size exponent
 504         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {
 505             skip_bits(gb, 16); //hrd_rate[n]
 506             skip_bits(gb, 16); //hrd_buffer[n]
 507         }
 508     }
 509     return 0;
 510 }
 511
 512 int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
 513 {
 514     int i;
 515
 516     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));
 517     v->broken_link = get_bits1(gb);
 518     v->closed_entry = get_bits1(gb);
 519     v->panscanflag = get_bits1(gb);
 520     v->refdist_flag = get_bits1(gb);
 521     v->s.loop_filter = get_bits1(gb);
 522     v->fastuvmc = get_bits1(gb);
 523     v->extended_mv = get_bits1(gb);
 524     v->dquant = get_bits(gb, 2);
 525     v->vstransform = get_bits1(gb);
 526     v->overlap = get_bits1(gb);
 527     v->quantizer_mode = get_bits(gb, 2);
 528
 529     if(v->hrd_param_flag){
 530         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {
 531             skip_bits(gb, 8); //hrd_full[n]
 532         }
 533     }
 534
 535     if(get_bits1(gb)){
 536         avctx->coded_width = (get_bits(gb, 12)+1)<<1;
 537         avctx->coded_height = (get_bits(gb, 12)+1)<<1;
 538     }
 539     if(v->extended_mv)
 540         v->extended_dmv = get_bits1(gb);
 541     if((v->range_mapy_flag = get_bits1(gb))) {
 542         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");
 543         v->range_mapy = get_bits(gb, 3);
 544     }
 545     if((v->range_mapuv_flag = get_bits1(gb))) {
 546         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");
 547         v->range_mapuv = get_bits(gb, 3);
 548     }
 549
 550     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"
 551         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"
 552         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"
 553         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",
 554         v->broken_link, v->closed_entry, v->panscanflag, v->refdist_flag, v->s.loop_filter,
 555         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);
 556
 557     return 0;
 558 }
 559
 560 int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
 561 {
 562     int pqindex, lowquant, status;
 563
 564     if(v->finterpflag) v->interpfrm = get_bits1(gb);
 565     skip_bits(gb, 2); //framecnt unused
 566     v->rangeredfrm = 0;
 567     if (v->rangered) v->rangeredfrm = get_bits1(gb);
 568     v->s.pict_type = get_bits1(gb);
 569     if (v->s.avctx->max_b_frames) {
 570         if (!v->s.pict_type) {
 571             if (get_bits1(gb)) v->s.pict_type = FF_I_TYPE;
 572             else v->s.pict_type = FF_B_TYPE;
 573         } else v->s.pict_type = FF_P_TYPE;
 574     } else v->s.pict_type = v->s.pict_type ? FF_P_TYPE : FF_I_TYPE;
 575
 576     v->bi_type = 0;
 577     if(v->s.pict_type == FF_B_TYPE) {
 578         v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
 579         v->bfraction = ff_vc1_bfraction_lut[v->bfraction_lut_index];
 580         if(v->bfraction == 0) {
 581             v->s.pict_type = FF_BI_TYPE;
 582         }
 583     }
 584     if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)
 585         skip_bits(gb, 7); // skip buffer fullness
 586
 587     if(v->parse_only)
 588         return 0;
 589
 590     /* calculate RND */
 591     if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)
 592         v->rnd = 1;
 593     if(v->s.pict_type == FF_P_TYPE)
 594         v->rnd ^= 1;
 595
 596     /* Quantizer stuff */
 597     pqindex = get_bits(gb, 5);
 598     if(!pqindex) return -1;
 599     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
 600         v->pq = ff_vc1_pquant_table[0][pqindex];
 601     else
 602         v->pq = ff_vc1_pquant_table[1][pqindex];
 603
 604     v->pquantizer = 1;
 605     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
 606         v->pquantizer = pqindex < 9;
 607     if (v->quantizer_mode == QUANT_NON_UNIFORM)
 608         v->pquantizer = 0;
 609     v->pqindex = pqindex;
 610     if (pqindex < 9) v->halfpq = get_bits1(gb);
 611     else v->halfpq = 0;
 612     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
 613         v->pquantizer = get_bits1(gb);
 614     v->dquantfrm = 0;
 615     if (v->extended_mv == 1) v->mvrange = get_unary(gb, 0, 3);
 616     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
 617     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
 618     v->range_x = 1 << (v->k_x - 1);
 619     v->range_y = 1 << (v->k_y - 1);
 620     if (v->multires && v->s.pict_type != FF_B_TYPE) v->respic = get_bits(gb, 2);
 621
 622     if(v->res_x8 && (v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)){
 623         v->x8_type = get_bits1(gb);
 624     }else v->x8_type = 0;
 625 //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",
 626 //        (v->s.pict_type == FF_P_TYPE) ? 'P' : ((v->s.pict_type == FF_I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);
 627
 628     if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_P_TYPE) v->use_ic = 0;
 629
 630     switch(v->s.pict_type) {
 631     case FF_P_TYPE:
 632         if (v->pq < 5) v->tt_index = 0;
 633         else if(v->pq < 13) v->tt_index = 1;
 634         else v->tt_index = 2;
 635
 636         lowquant = (v->pq > 12) ? 0 : 1;
 637         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];
 638         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
 639         {
 640             int scale, shift, i;
 641             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];
 642             v->lumscale = get_bits(gb, 6);
 643             v->lumshift = get_bits(gb, 6);
 644             v->use_ic = 1;
 645             /* fill lookup tables for intensity compensation */
 646             if(!v->lumscale) {
 647                 scale = -64;
 648                 shift = (255 - v->lumshift * 2) << 6;
 649                 if(v->lumshift > 31)
 650                     shift += 128 << 6;
 651             } else {
 652                 scale = v->lumscale + 32;
 653                 if(v->lumshift > 31)
 654                     shift = (v->lumshift - 64) << 6;
 655                 else
 656                     shift = v->lumshift << 6;
 657             }
 658             for(i = 0; i < 256; i++) {
 659                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);
 660                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);
 661             }
 662         }
 663         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)
 664             v->s.quarter_sample = 0;
 665         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {
 666             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)
 667                 v->s.quarter_sample = 0;
 668             else
 669                 v->s.quarter_sample = 1;
 670         } else
 671             v->s.quarter_sample = 1;
 672         v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN || (v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));
 673
 674         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
 675                  v->mv_mode2 == MV_PMODE_MIXED_MV)
 676                 || v->mv_mode == MV_PMODE_MIXED_MV)
 677         {
 678             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);
 679             if (status < 0) return -1;
 680             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "
 681                    "Imode: %i, Invert: %i\n", status>>1, status&1);
 682         } else {
 683             v->mv_type_is_raw = 0;
 684             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);
 685         }
 686         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
 687         if (status < 0) return -1;
 688         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
 689                "Imode: %i, Invert: %i\n", status>>1, status&1);
 690
 691         /* Hopefully this is correct for P frames */
 692         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables
 693         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];
 694
 695         if (v->dquant)
 696         {
 697             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
 698             vop_dquant_decoding(v);
 699         }
 700
 701         v->ttfrm = 0; //FIXME Is that so ?
 702         if (v->vstransform)
 703         {
 704             v->ttmbf = get_bits1(gb);
 705             if (v->ttmbf)
 706             {
 707                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
 708             }
 709         } else {
 710             v->ttmbf = 1;
 711             v->ttfrm = TT_8X8;
 712         }
 713         break;
 714     case FF_B_TYPE:
 715         if (v->pq < 5) v->tt_index = 0;
 716         else if(v->pq < 13) v->tt_index = 1;
 717         else v->tt_index = 2;
 718
 719         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
 720         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);
 721         v->s.mspel = v->s.quarter_sample;
 722
 723         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);
 724         if (status < 0) return -1;
 725         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "
 726                "Imode: %i, Invert: %i\n", status>>1, status&1);
 727         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
 728         if (status < 0) return -1;
 729         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
 730                "Imode: %i, Invert: %i\n", status>>1, status&1);
 731
 732         v->s.mv_table_index = get_bits(gb, 2);
 733         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];
 734
 735         if (v->dquant)
 736         {
 737             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
 738             vop_dquant_decoding(v);
 739         }
 740
 741         v->ttfrm = 0;
 742         if (v->vstransform)
 743         {
 744             v->ttmbf = get_bits1(gb);
 745             if (v->ttmbf)
 746             {
 747                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
 748             }
 749         } else {
 750             v->ttmbf = 1;
 751             v->ttfrm = TT_8X8;
 752         }
 753         break;
 754     }
 755
 756     if(!v->x8_type)
 757     {
 758         /* AC Syntax */
 759         v->c_ac_table_index = decode012(gb);
 760         if (v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)
 761         {
 762             v->y_ac_table_index = decode012(gb);
 763         }
 764         /* DC Syntax */
 765         v->s.dc_table_index = get_bits1(gb);
 766     }
 767
 768     if(v->s.pict_type == FF_BI_TYPE) {
 769         v->s.pict_type = FF_B_TYPE;
 770         v->bi_type = 1;
 771     }
 772     return 0;
 773 }
 774
 775 int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
 776 {
 777     int pqindex, lowquant;
 778     int status;
 779
 780     v->p_frame_skipped = 0;
 781
 782     if(v->interlace){
 783         v->fcm = decode012(gb);
 784         if(v->fcm) return -1; // interlaced frames/fields are not implemented
 785     }
 786     switch(get_unary(gb, 0, 4)) {
 787     case 0:
 788         v->s.pict_type = FF_P_TYPE;
 789         break;
 790     case 1:
 791         v->s.pict_type = FF_B_TYPE;
 792         break;
 793     case 2:
 794         v->s.pict_type = FF_I_TYPE;
 795         break;
 796     case 3:
 797         v->s.pict_type = FF_BI_TYPE;
 798         break;
 799     case 4:
 800         v->s.pict_type = FF_P_TYPE; // skipped pic
 801         v->p_frame_skipped = 1;
 802         return 0;
 803     }
 804     if(v->tfcntrflag)
 805         skip_bits(gb, 8);
 806     if(v->broadcast) {
 807         if(!v->interlace || v->psf) {
 808             v->rptfrm = get_bits(gb, 2);
 809         } else {
 810             v->tff = get_bits1(gb);
 811             v->rptfrm = get_bits1(gb);
 812         }
 813     }
 814     if(v->panscanflag) {
 815         //...
 816     }
 817     v->rnd = get_bits1(gb);
 818     if(v->interlace)
 819         v->uvsamp = get_bits1(gb);
 820     if(v->finterpflag) v->interpfrm = get_bits1(gb);
 821     if(v->s.pict_type == FF_B_TYPE) {
 822         v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
 823         v->bfraction = ff_vc1_bfraction_lut[v->bfraction_lut_index];
 824         if(v->bfraction == 0) {
 825             v->s.pict_type = FF_BI_TYPE; /* XXX: should not happen here */
 826         }
 827     }
 828     pqindex = get_bits(gb, 5);
 829     if(!pqindex) return -1;
 830     v->pqindex = pqindex;
 831     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
 832         v->pq = ff_vc1_pquant_table[0][pqindex];
 833     else
 834         v->pq = ff_vc1_pquant_table[1][pqindex];
 835
 836     v->pquantizer = 1;
 837     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
 838         v->pquantizer = pqindex < 9;
 839     if (v->quantizer_mode == QUANT_NON_UNIFORM)
 840         v->pquantizer = 0;
 841     v->pqindex = pqindex;
 842     if (pqindex < 9) v->halfpq = get_bits1(gb);
 843     else v->halfpq = 0;
 844     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
 845         v->pquantizer = get_bits1(gb);
 846     if(v->postprocflag)
 847         v->postproc = get_bits(gb, 2);
 848
 849     if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_P_TYPE) v->use_ic = 0;
 850
 851     if(v->parse_only)
 852         return 0;
 853
 854     switch(v->s.pict_type) {
 855     case FF_I_TYPE:
 856     case FF_BI_TYPE:
 857         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);
 858         if (status < 0) return -1;
 859         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "
 860                 "Imode: %i, Invert: %i\n", status>>1, status&1);
 861         v->condover = CONDOVER_NONE;
 862         if(v->overlap && v->pq <= 8) {
 863             v->condover = decode012(gb);
 864             if(v->condover == CONDOVER_SELECT) {
 865                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);
 866                 if (status < 0) return -1;
 867                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "
 868                         "Imode: %i, Invert: %i\n", status>>1, status&1);
 869             }
 870         }
 871         break;
 872     case FF_P_TYPE:
 873         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);
 874         else v->mvrange = 0;
 875         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
 876         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
 877         v->range_x = 1 << (v->k_x - 1);
 878         v->range_y = 1 << (v->k_y - 1);
 879
 880         if (v->pq < 5) v->tt_index = 0;
 881         else if(v->pq < 13) v->tt_index = 1;
 882         else v->tt_index = 2;
 883
 884         lowquant = (v->pq > 12) ? 0 : 1;
 885         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];
 886         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
 887         {
 888             int scale, shift, i;
 889             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];
 890             v->lumscale = get_bits(gb, 6);
 891             v->lumshift = get_bits(gb, 6);
 892             /* fill lookup tables for intensity compensation */
 893             if(!v->lumscale) {
 894                 scale = -64;
 895                 shift = (255 - v->lumshift * 2) << 6;
 896                 if(v->lumshift > 31)
 897                     shift += 128 << 6;
 898             } else {
 899                 scale = v->lumscale + 32;
 900                 if(v->lumshift > 31)
 901                     shift = (v->lumshift - 64) << 6;
 902                 else
 903                     shift = v->lumshift << 6;
 904             }
 905             for(i = 0; i < 256; i++) {
 906                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);
 907                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);
 908             }
 909             v->use_ic = 1;
 910         }
 911         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)
 912             v->s.quarter_sample = 0;
 913         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {
 914             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)
 915                 v->s.quarter_sample = 0;
 916             else
 917                 v->s.quarter_sample = 1;
 918         } else
 919             v->s.quarter_sample = 1;
 920         v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN || (v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));
 921
 922         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
 923                  v->mv_mode2 == MV_PMODE_MIXED_MV)
 924                 || v->mv_mode == MV_PMODE_MIXED_MV)
 925         {
 926             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);
 927             if (status < 0) return -1;
 928             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "
 929                    "Imode: %i, Invert: %i\n", status>>1, status&1);
 930         } else {
 931             v->mv_type_is_raw = 0;
 932             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);
 933         }
 934         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
 935         if (status < 0) return -1;
 936         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
 937                "Imode: %i, Invert: %i\n", status>>1, status&1);
 938
 939         /* Hopefully this is correct for P frames */
 940         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables
 941         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];
 942         if (v->dquant)
 943         {
 944             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
 945             vop_dquant_decoding(v);
 946         }
 947
 948         v->ttfrm = 0; //FIXME Is that so ?
 949         if (v->vstransform)
 950         {
 951             v->ttmbf = get_bits1(gb);
 952             if (v->ttmbf)
 953             {
 954                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
 955             }
 956         } else {
 957             v->ttmbf = 1;
 958             v->ttfrm = TT_8X8;
 959         }
 960         break;
 961     case FF_B_TYPE:
 962         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);
 963         else v->mvrange = 0;
 964         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
 965         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
 966         v->range_x = 1 << (v->k_x - 1);
 967         v->range_y = 1 << (v->k_y - 1);
 968
 969         if (v->pq < 5) v->tt_index = 0;
 970         else if(v->pq < 13) v->tt_index = 1;
 971         else v->tt_index = 2;
 972
 973         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
 974         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);
 975         v->s.mspel = v->s.quarter_sample;
 976
 977         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);
 978         if (status < 0) return -1;
 979         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "
 980                "Imode: %i, Invert: %i\n", status>>1, status&1);
 981         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
 982         if (status < 0) return -1;
 983         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
 984                "Imode: %i, Invert: %i\n", status>>1, status&1);
 985
 986         v->s.mv_table_index = get_bits(gb, 2);
 987         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];
 988
 989         if (v->dquant)
 990         {
 991             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
 992             vop_dquant_decoding(v);
 993         }
 994
 995         v->ttfrm = 0;
 996         if (v->vstransform)
 997         {
 998             v->ttmbf = get_bits1(gb);
 999             if (v->ttmbf)
1000             {
1001                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
1002             }
1003         } else {
1004             v->ttmbf = 1;
1005             v->ttfrm = TT_8X8;
1006         }
1007         break;
1008     }
1009
1010     /* AC Syntax */
1011     v->c_ac_table_index = decode012(gb);
1012     if (v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)
1013     {
1014         v->y_ac_table_index = decode012(gb);
1015     }
1016     /* DC Syntax */
1017     v->s.dc_table_index = get_bits1(gb);
1018     if ((v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE) && v->dquant) {
1019         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
1020         vop_dquant_decoding(v);
1021     }
1022
1023     v->bi_type = 0;
1024     if(v->s.pict_type == FF_BI_TYPE) {
1025         v->s.pict_type = FF_B_TYPE;
1026         v->bi_type = 1;
1027     }
1028     return 0;
1029 }