| 1 | /* |
| 2 | * ITU H263 bitstream decoder |
| 3 | * Copyright (c) 2000,2001 Fabrice Bellard |
| 4 | * H263+ support. |
| 5 | * Copyright (c) 2001 Juan J. Sierralta P |
| 6 | * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
| 7 | * |
| 8 | * This file is part of FFmpeg. |
| 9 | * |
| 10 | * FFmpeg is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU Lesser General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2.1 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * FFmpeg is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * Lesser General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Lesser General Public |
| 21 | * License along with FFmpeg; if not, write to the Free Software |
| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 23 | */ |
| 24 | |
| 25 | /** |
| 26 | * @file |
| 27 | * h263 decoder. |
| 28 | */ |
| 29 | |
| 30 | #define UNCHECKED_BITSTREAM_READER 1 |
| 31 | #include <limits.h> |
| 32 | |
| 33 | #include "libavutil/attributes.h" |
| 34 | #include "libavutil/internal.h" |
| 35 | #include "libavutil/mathematics.h" |
| 36 | #include "avcodec.h" |
| 37 | #include "mpegvideo.h" |
| 38 | #include "h263.h" |
| 39 | #include "mathops.h" |
| 40 | #include "mpegutils.h" |
| 41 | #include "unary.h" |
| 42 | #include "flv.h" |
| 43 | #include "mpeg4video.h" |
| 44 | |
| 45 | // The defines below define the number of bits that are read at once for |
| 46 | // reading vlc values. Changing these may improve speed and data cache needs |
| 47 | // be aware though that decreasing them may need the number of stages that is |
| 48 | // passed to get_vlc* to be increased. |
| 49 | #define MV_VLC_BITS 9 |
| 50 | #define H263_MBTYPE_B_VLC_BITS 6 |
| 51 | #define CBPC_B_VLC_BITS 3 |
| 52 | |
| 53 | static const int h263_mb_type_b_map[15]= { |
| 54 | MB_TYPE_DIRECT2 | MB_TYPE_L0L1, |
| 55 | MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP, |
| 56 | MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT, |
| 57 | MB_TYPE_L0 | MB_TYPE_16x16, |
| 58 | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_16x16, |
| 59 | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16, |
| 60 | MB_TYPE_L1 | MB_TYPE_16x16, |
| 61 | MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_16x16, |
| 62 | MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16, |
| 63 | MB_TYPE_L0L1 | MB_TYPE_16x16, |
| 64 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_16x16, |
| 65 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16, |
| 66 | 0, //stuffing |
| 67 | MB_TYPE_INTRA4x4 | MB_TYPE_CBP, |
| 68 | MB_TYPE_INTRA4x4 | MB_TYPE_CBP | MB_TYPE_QUANT, |
| 69 | }; |
| 70 | |
| 71 | void ff_h263_show_pict_info(MpegEncContext *s){ |
| 72 | if(s->avctx->debug&FF_DEBUG_PICT_INFO){ |
| 73 | av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%d\n", |
| 74 | s->qscale, av_get_picture_type_char(s->pict_type), |
| 75 | s->gb.size_in_bits, 1-s->no_rounding, |
| 76 | s->obmc ? " AP" : "", |
| 77 | s->umvplus ? " UMV" : "", |
| 78 | s->h263_long_vectors ? " LONG" : "", |
| 79 | s->h263_plus ? " +" : "", |
| 80 | s->h263_aic ? " AIC" : "", |
| 81 | s->alt_inter_vlc ? " AIV" : "", |
| 82 | s->modified_quant ? " MQ" : "", |
| 83 | s->loop_filter ? " LOOP" : "", |
| 84 | s->h263_slice_structured ? " SS" : "", |
| 85 | s->avctx->time_base.den, s->avctx->time_base.num |
| 86 | ); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | /***********************************************/ |
| 91 | /* decoding */ |
| 92 | |
| 93 | VLC ff_h263_intra_MCBPC_vlc; |
| 94 | VLC ff_h263_inter_MCBPC_vlc; |
| 95 | VLC ff_h263_cbpy_vlc; |
| 96 | static VLC mv_vlc; |
| 97 | static VLC h263_mbtype_b_vlc; |
| 98 | static VLC cbpc_b_vlc; |
| 99 | |
| 100 | /* init vlcs */ |
| 101 | |
| 102 | /* XXX: find a better solution to handle static init */ |
| 103 | av_cold void ff_h263_decode_init_vlc(void) |
| 104 | { |
| 105 | static volatile int done = 0; |
| 106 | |
| 107 | if (!done) { |
| 108 | INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9, |
| 109 | ff_h263_intra_MCBPC_bits, 1, 1, |
| 110 | ff_h263_intra_MCBPC_code, 1, 1, 72); |
| 111 | INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28, |
| 112 | ff_h263_inter_MCBPC_bits, 1, 1, |
| 113 | ff_h263_inter_MCBPC_code, 1, 1, 198); |
| 114 | INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16, |
| 115 | &ff_h263_cbpy_tab[0][1], 2, 1, |
| 116 | &ff_h263_cbpy_tab[0][0], 2, 1, 64); |
| 117 | INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33, |
| 118 | &ff_mvtab[0][1], 2, 1, |
| 119 | &ff_mvtab[0][0], 2, 1, 538); |
| 120 | ff_init_rl(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]); |
| 121 | ff_init_rl(&ff_rl_intra_aic, ff_h263_static_rl_table_store[1]); |
| 122 | INIT_VLC_RL(ff_h263_rl_inter, 554); |
| 123 | INIT_VLC_RL(ff_rl_intra_aic, 554); |
| 124 | INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15, |
| 125 | &ff_h263_mbtype_b_tab[0][1], 2, 1, |
| 126 | &ff_h263_mbtype_b_tab[0][0], 2, 1, 80); |
| 127 | INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4, |
| 128 | &ff_cbpc_b_tab[0][1], 2, 1, |
| 129 | &ff_cbpc_b_tab[0][0], 2, 1, 8); |
| 130 | done = 1; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | int ff_h263_decode_mba(MpegEncContext *s) |
| 135 | { |
| 136 | int i, mb_pos; |
| 137 | |
| 138 | for(i=0; i<6; i++){ |
| 139 | if(s->mb_num-1 <= ff_mba_max[i]) break; |
| 140 | } |
| 141 | mb_pos= get_bits(&s->gb, ff_mba_length[i]); |
| 142 | s->mb_x= mb_pos % s->mb_width; |
| 143 | s->mb_y= mb_pos / s->mb_width; |
| 144 | |
| 145 | return mb_pos; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Decode the group of blocks header or slice header. |
| 150 | * @return <0 if an error occurred |
| 151 | */ |
| 152 | static int h263_decode_gob_header(MpegEncContext *s) |
| 153 | { |
| 154 | unsigned int val, gob_number; |
| 155 | int left; |
| 156 | |
| 157 | /* Check for GOB Start Code */ |
| 158 | val = show_bits(&s->gb, 16); |
| 159 | if(val) |
| 160 | return -1; |
| 161 | |
| 162 | /* We have a GBSC probably with GSTUFF */ |
| 163 | skip_bits(&s->gb, 16); /* Drop the zeros */ |
| 164 | left= get_bits_left(&s->gb); |
| 165 | //MN: we must check the bits left or we might end in a infinite loop (or segfault) |
| 166 | for(;left>13; left--){ |
| 167 | if(get_bits1(&s->gb)) break; /* Seek the '1' bit */ |
| 168 | } |
| 169 | if(left<=13) |
| 170 | return -1; |
| 171 | |
| 172 | if(s->h263_slice_structured){ |
| 173 | if(get_bits1(&s->gb)==0) |
| 174 | return -1; |
| 175 | |
| 176 | ff_h263_decode_mba(s); |
| 177 | |
| 178 | if(s->mb_num > 1583) |
| 179 | if(get_bits1(&s->gb)==0) |
| 180 | return -1; |
| 181 | |
| 182 | s->qscale = get_bits(&s->gb, 5); /* SQUANT */ |
| 183 | if(get_bits1(&s->gb)==0) |
| 184 | return -1; |
| 185 | skip_bits(&s->gb, 2); /* GFID */ |
| 186 | }else{ |
| 187 | gob_number = get_bits(&s->gb, 5); /* GN */ |
| 188 | s->mb_x= 0; |
| 189 | s->mb_y= s->gob_index* gob_number; |
| 190 | skip_bits(&s->gb, 2); /* GFID */ |
| 191 | s->qscale = get_bits(&s->gb, 5); /* GQUANT */ |
| 192 | } |
| 193 | |
| 194 | if(s->mb_y >= s->mb_height) |
| 195 | return -1; |
| 196 | |
| 197 | if(s->qscale==0) |
| 198 | return -1; |
| 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Decode the group of blocks / video packet header. |
| 205 | * @return bit position of the resync_marker, or <0 if none was found |
| 206 | */ |
| 207 | int ff_h263_resync(MpegEncContext *s){ |
| 208 | int left, pos, ret; |
| 209 | |
| 210 | if(s->codec_id==AV_CODEC_ID_MPEG4){ |
| 211 | skip_bits1(&s->gb); |
| 212 | align_get_bits(&s->gb); |
| 213 | } |
| 214 | |
| 215 | if(show_bits(&s->gb, 16)==0){ |
| 216 | pos= get_bits_count(&s->gb); |
| 217 | if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4) |
| 218 | ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data); |
| 219 | else |
| 220 | ret= h263_decode_gob_header(s); |
| 221 | if(ret>=0) |
| 222 | return pos; |
| 223 | } |
| 224 | //OK, it's not where it is supposed to be ... |
| 225 | s->gb= s->last_resync_gb; |
| 226 | align_get_bits(&s->gb); |
| 227 | left= get_bits_left(&s->gb); |
| 228 | |
| 229 | for(;left>16+1+5+5; left-=8){ |
| 230 | if(show_bits(&s->gb, 16)==0){ |
| 231 | GetBitContext bak= s->gb; |
| 232 | |
| 233 | pos= get_bits_count(&s->gb); |
| 234 | if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4) |
| 235 | ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data); |
| 236 | else |
| 237 | ret= h263_decode_gob_header(s); |
| 238 | if(ret>=0) |
| 239 | return pos; |
| 240 | |
| 241 | s->gb= bak; |
| 242 | } |
| 243 | skip_bits(&s->gb, 8); |
| 244 | } |
| 245 | |
| 246 | return -1; |
| 247 | } |
| 248 | |
| 249 | int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code) |
| 250 | { |
| 251 | int code, val, sign, shift; |
| 252 | code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2); |
| 253 | |
| 254 | if (code == 0) |
| 255 | return pred; |
| 256 | if (code < 0) |
| 257 | return 0xffff; |
| 258 | |
| 259 | sign = get_bits1(&s->gb); |
| 260 | shift = f_code - 1; |
| 261 | val = code; |
| 262 | if (shift) { |
| 263 | val = (val - 1) << shift; |
| 264 | val |= get_bits(&s->gb, shift); |
| 265 | val++; |
| 266 | } |
| 267 | if (sign) |
| 268 | val = -val; |
| 269 | val += pred; |
| 270 | |
| 271 | /* modulo decoding */ |
| 272 | if (!s->h263_long_vectors) { |
| 273 | val = sign_extend(val, 5 + f_code); |
| 274 | } else { |
| 275 | /* horrible h263 long vector mode */ |
| 276 | if (pred < -31 && val < -63) |
| 277 | val += 64; |
| 278 | if (pred > 32 && val > 63) |
| 279 | val -= 64; |
| 280 | |
| 281 | } |
| 282 | return val; |
| 283 | } |
| 284 | |
| 285 | |
| 286 | /* Decode RVLC of H.263+ UMV */ |
| 287 | static int h263p_decode_umotion(MpegEncContext * s, int pred) |
| 288 | { |
| 289 | int code = 0, sign; |
| 290 | |
| 291 | if (get_bits1(&s->gb)) /* Motion difference = 0 */ |
| 292 | return pred; |
| 293 | |
| 294 | code = 2 + get_bits1(&s->gb); |
| 295 | |
| 296 | while (get_bits1(&s->gb)) |
| 297 | { |
| 298 | code <<= 1; |
| 299 | code += get_bits1(&s->gb); |
| 300 | } |
| 301 | sign = code & 1; |
| 302 | code >>= 1; |
| 303 | |
| 304 | code = (sign) ? (pred - code) : (pred + code); |
| 305 | av_dlog(s->avctx,"H.263+ UMV Motion = %d\n", code); |
| 306 | return code; |
| 307 | |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * read the next MVs for OBMC. yes this is a ugly hack, feel free to send a patch :) |
| 312 | */ |
| 313 | static void preview_obmc(MpegEncContext *s){ |
| 314 | GetBitContext gb= s->gb; |
| 315 | |
| 316 | int cbpc, i, pred_x, pred_y, mx, my; |
| 317 | int16_t *mot_val; |
| 318 | const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride; |
| 319 | const int stride= s->b8_stride*2; |
| 320 | |
| 321 | for(i=0; i<4; i++) |
| 322 | s->block_index[i]+= 2; |
| 323 | for(i=4; i<6; i++) |
| 324 | s->block_index[i]+= 1; |
| 325 | s->mb_x++; |
| 326 | |
| 327 | av_assert2(s->pict_type == AV_PICTURE_TYPE_P); |
| 328 | |
| 329 | do{ |
| 330 | if (get_bits1(&s->gb)) { |
| 331 | /* skip mb */ |
| 332 | mot_val = s->current_picture.motion_val[0][s->block_index[0]]; |
| 333 | mot_val[0 ]= mot_val[2 ]= |
| 334 | mot_val[0+stride]= mot_val[2+stride]= 0; |
| 335 | mot_val[1 ]= mot_val[3 ]= |
| 336 | mot_val[1+stride]= mot_val[3+stride]= 0; |
| 337 | |
| 338 | s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; |
| 339 | goto end; |
| 340 | } |
| 341 | cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); |
| 342 | }while(cbpc == 20); |
| 343 | |
| 344 | if(cbpc & 4){ |
| 345 | s->current_picture.mb_type[xy] = MB_TYPE_INTRA; |
| 346 | }else{ |
| 347 | get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
| 348 | if (cbpc & 8) { |
| 349 | if(s->modified_quant){ |
| 350 | if(get_bits1(&s->gb)) skip_bits(&s->gb, 1); |
| 351 | else skip_bits(&s->gb, 5); |
| 352 | }else |
| 353 | skip_bits(&s->gb, 2); |
| 354 | } |
| 355 | |
| 356 | if ((cbpc & 16) == 0) { |
| 357 | s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0; |
| 358 | /* 16x16 motion prediction */ |
| 359 | mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); |
| 360 | if (s->umvplus) |
| 361 | mx = h263p_decode_umotion(s, pred_x); |
| 362 | else |
| 363 | mx = ff_h263_decode_motion(s, pred_x, 1); |
| 364 | |
| 365 | if (s->umvplus) |
| 366 | my = h263p_decode_umotion(s, pred_y); |
| 367 | else |
| 368 | my = ff_h263_decode_motion(s, pred_y, 1); |
| 369 | |
| 370 | mot_val[0 ]= mot_val[2 ]= |
| 371 | mot_val[0+stride]= mot_val[2+stride]= mx; |
| 372 | mot_val[1 ]= mot_val[3 ]= |
| 373 | mot_val[1+stride]= mot_val[3+stride]= my; |
| 374 | } else { |
| 375 | s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0; |
| 376 | for(i=0;i<4;i++) { |
| 377 | mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); |
| 378 | if (s->umvplus) |
| 379 | mx = h263p_decode_umotion(s, pred_x); |
| 380 | else |
| 381 | mx = ff_h263_decode_motion(s, pred_x, 1); |
| 382 | |
| 383 | if (s->umvplus) |
| 384 | my = h263p_decode_umotion(s, pred_y); |
| 385 | else |
| 386 | my = ff_h263_decode_motion(s, pred_y, 1); |
| 387 | if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1) |
| 388 | skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */ |
| 389 | mot_val[0] = mx; |
| 390 | mot_val[1] = my; |
| 391 | } |
| 392 | } |
| 393 | } |
| 394 | end: |
| 395 | |
| 396 | for(i=0; i<4; i++) |
| 397 | s->block_index[i]-= 2; |
| 398 | for(i=4; i<6; i++) |
| 399 | s->block_index[i]-= 1; |
| 400 | s->mb_x--; |
| 401 | |
| 402 | s->gb= gb; |
| 403 | } |
| 404 | |
| 405 | static void h263_decode_dquant(MpegEncContext *s){ |
| 406 | static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; |
| 407 | |
| 408 | if(s->modified_quant){ |
| 409 | if(get_bits1(&s->gb)) |
| 410 | s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ]; |
| 411 | else |
| 412 | s->qscale= get_bits(&s->gb, 5); |
| 413 | }else |
| 414 | s->qscale += quant_tab[get_bits(&s->gb, 2)]; |
| 415 | ff_set_qscale(s, s->qscale); |
| 416 | } |
| 417 | |
| 418 | static int h263_decode_block(MpegEncContext * s, int16_t * block, |
| 419 | int n, int coded) |
| 420 | { |
| 421 | int level, i, j, run; |
| 422 | RLTable *rl = &ff_h263_rl_inter; |
| 423 | const uint8_t *scan_table; |
| 424 | GetBitContext gb= s->gb; |
| 425 | |
| 426 | scan_table = s->intra_scantable.permutated; |
| 427 | if (s->h263_aic && s->mb_intra) { |
| 428 | rl = &ff_rl_intra_aic; |
| 429 | i = 0; |
| 430 | if (s->ac_pred) { |
| 431 | if (s->h263_aic_dir) |
| 432 | scan_table = s->intra_v_scantable.permutated; /* left */ |
| 433 | else |
| 434 | scan_table = s->intra_h_scantable.permutated; /* top */ |
| 435 | } |
| 436 | } else if (s->mb_intra) { |
| 437 | /* DC coef */ |
| 438 | if(s->codec_id == AV_CODEC_ID_RV10){ |
| 439 | #if CONFIG_RV10_DECODER |
| 440 | if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) { |
| 441 | int component, diff; |
| 442 | component = (n <= 3 ? 0 : n - 4 + 1); |
| 443 | level = s->last_dc[component]; |
| 444 | if (s->rv10_first_dc_coded[component]) { |
| 445 | diff = ff_rv_decode_dc(s, n); |
| 446 | if (diff == 0xffff) |
| 447 | return -1; |
| 448 | level += diff; |
| 449 | level = level & 0xff; /* handle wrap round */ |
| 450 | s->last_dc[component] = level; |
| 451 | } else { |
| 452 | s->rv10_first_dc_coded[component] = 1; |
| 453 | } |
| 454 | } else { |
| 455 | level = get_bits(&s->gb, 8); |
| 456 | if (level == 255) |
| 457 | level = 128; |
| 458 | } |
| 459 | #endif |
| 460 | }else{ |
| 461 | level = get_bits(&s->gb, 8); |
| 462 | if((level&0x7F) == 0){ |
| 463 | av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y); |
| 464 | if(s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) |
| 465 | return -1; |
| 466 | } |
| 467 | if (level == 255) |
| 468 | level = 128; |
| 469 | } |
| 470 | block[0] = level; |
| 471 | i = 1; |
| 472 | } else { |
| 473 | i = 0; |
| 474 | } |
| 475 | if (!coded) { |
| 476 | if (s->mb_intra && s->h263_aic) |
| 477 | goto not_coded; |
| 478 | s->block_last_index[n] = i - 1; |
| 479 | return 0; |
| 480 | } |
| 481 | retry: |
| 482 | { |
| 483 | OPEN_READER(re, &s->gb); |
| 484 | i--; // offset by -1 to allow direct indexing of scan_table |
| 485 | for(;;) { |
| 486 | UPDATE_CACHE(re, &s->gb); |
| 487 | GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); |
| 488 | if (run == 66) { |
| 489 | if (level){ |
| 490 | CLOSE_READER(re, &s->gb); |
| 491 | av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y); |
| 492 | return -1; |
| 493 | } |
| 494 | /* escape */ |
| 495 | if (CONFIG_FLV_DECODER && s->h263_flv > 1) { |
| 496 | int is11 = SHOW_UBITS(re, &s->gb, 1); |
| 497 | SKIP_CACHE(re, &s->gb, 1); |
| 498 | run = SHOW_UBITS(re, &s->gb, 7) + 1; |
| 499 | if (is11) { |
| 500 | SKIP_COUNTER(re, &s->gb, 1 + 7); |
| 501 | UPDATE_CACHE(re, &s->gb); |
| 502 | level = SHOW_SBITS(re, &s->gb, 11); |
| 503 | SKIP_COUNTER(re, &s->gb, 11); |
| 504 | } else { |
| 505 | SKIP_CACHE(re, &s->gb, 7); |
| 506 | level = SHOW_SBITS(re, &s->gb, 7); |
| 507 | SKIP_COUNTER(re, &s->gb, 1 + 7 + 7); |
| 508 | } |
| 509 | } else { |
| 510 | run = SHOW_UBITS(re, &s->gb, 7) + 1; |
| 511 | SKIP_CACHE(re, &s->gb, 7); |
| 512 | level = (int8_t)SHOW_UBITS(re, &s->gb, 8); |
| 513 | SKIP_COUNTER(re, &s->gb, 7 + 8); |
| 514 | if(level == -128){ |
| 515 | UPDATE_CACHE(re, &s->gb); |
| 516 | if (s->codec_id == AV_CODEC_ID_RV10) { |
| 517 | /* XXX: should patch encoder too */ |
| 518 | level = SHOW_SBITS(re, &s->gb, 12); |
| 519 | SKIP_COUNTER(re, &s->gb, 12); |
| 520 | }else{ |
| 521 | level = SHOW_UBITS(re, &s->gb, 5); |
| 522 | SKIP_CACHE(re, &s->gb, 5); |
| 523 | level |= SHOW_SBITS(re, &s->gb, 6)<<5; |
| 524 | SKIP_COUNTER(re, &s->gb, 5 + 6); |
| 525 | } |
| 526 | } |
| 527 | } |
| 528 | } else { |
| 529 | if (SHOW_UBITS(re, &s->gb, 1)) |
| 530 | level = -level; |
| 531 | SKIP_COUNTER(re, &s->gb, 1); |
| 532 | } |
| 533 | i += run; |
| 534 | if (i >= 64){ |
| 535 | CLOSE_READER(re, &s->gb); |
| 536 | // redo update without last flag, revert -1 offset |
| 537 | i = i - run + ((run-1)&63) + 1; |
| 538 | if (i < 64) { |
| 539 | // only last marker, no overrun |
| 540 | block[scan_table[i]] = level; |
| 541 | break; |
| 542 | } |
| 543 | if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){ |
| 544 | //Looks like a hack but no, it's the way it is supposed to work ... |
| 545 | rl = &ff_rl_intra_aic; |
| 546 | i = 0; |
| 547 | s->gb= gb; |
| 548 | s->bdsp.clear_block(block); |
| 549 | goto retry; |
| 550 | } |
| 551 | av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra); |
| 552 | return -1; |
| 553 | } |
| 554 | j = scan_table[i]; |
| 555 | block[j] = level; |
| 556 | } |
| 557 | } |
| 558 | not_coded: |
| 559 | if (s->mb_intra && s->h263_aic) { |
| 560 | ff_h263_pred_acdc(s, block, n); |
| 561 | i = 63; |
| 562 | } |
| 563 | s->block_last_index[n] = i; |
| 564 | return 0; |
| 565 | } |
| 566 | |
| 567 | static int h263_skip_b_part(MpegEncContext *s, int cbp) |
| 568 | { |
| 569 | LOCAL_ALIGNED_16(int16_t, dblock, [64]); |
| 570 | int i, mbi; |
| 571 | int bli[6]; |
| 572 | |
| 573 | /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly |
| 574 | * but real value should be restored in order to be used later (in OBMC condition) |
| 575 | */ |
| 576 | mbi = s->mb_intra; |
| 577 | memcpy(bli, s->block_last_index, sizeof(bli)); |
| 578 | s->mb_intra = 0; |
| 579 | for (i = 0; i < 6; i++) { |
| 580 | if (h263_decode_block(s, dblock, i, cbp&32) < 0) |
| 581 | return -1; |
| 582 | cbp+=cbp; |
| 583 | } |
| 584 | s->mb_intra = mbi; |
| 585 | memcpy(s->block_last_index, bli, sizeof(bli)); |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb) |
| 590 | { |
| 591 | int c, mv = 1; |
| 592 | |
| 593 | if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame |
| 594 | c = get_bits1(gb); |
| 595 | if (pb_frame == 2 && c) |
| 596 | mv = !get_bits1(gb); |
| 597 | } else { // h.263 Annex M improved PB-frame |
| 598 | mv = get_unary(gb, 0, 4) + 1; |
| 599 | c = mv & 1; |
| 600 | mv = !!(mv & 2); |
| 601 | } |
| 602 | if(c) |
| 603 | *cbpb = get_bits(gb, 6); |
| 604 | return mv; |
| 605 | } |
| 606 | |
| 607 | int ff_h263_decode_mb(MpegEncContext *s, |
| 608 | int16_t block[6][64]) |
| 609 | { |
| 610 | int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant; |
| 611 | int16_t *mot_val; |
| 612 | const int xy= s->mb_x + s->mb_y * s->mb_stride; |
| 613 | int cbpb = 0, pb_mv_count = 0; |
| 614 | |
| 615 | av_assert2(!s->h263_pred); |
| 616 | |
| 617 | if (s->pict_type == AV_PICTURE_TYPE_P) { |
| 618 | do{ |
| 619 | if (get_bits1(&s->gb)) { |
| 620 | /* skip mb */ |
| 621 | s->mb_intra = 0; |
| 622 | for(i=0;i<6;i++) |
| 623 | s->block_last_index[i] = -1; |
| 624 | s->mv_dir = MV_DIR_FORWARD; |
| 625 | s->mv_type = MV_TYPE_16X16; |
| 626 | s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; |
| 627 | s->mv[0][0][0] = 0; |
| 628 | s->mv[0][0][1] = 0; |
| 629 | s->mb_skipped = !(s->obmc | s->loop_filter); |
| 630 | goto end; |
| 631 | } |
| 632 | cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); |
| 633 | if (cbpc < 0){ |
| 634 | av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y); |
| 635 | return -1; |
| 636 | } |
| 637 | }while(cbpc == 20); |
| 638 | |
| 639 | s->bdsp.clear_blocks(s->block[0]); |
| 640 | |
| 641 | dquant = cbpc & 8; |
| 642 | s->mb_intra = ((cbpc & 4) != 0); |
| 643 | if (s->mb_intra) goto intra; |
| 644 | |
| 645 | if(s->pb_frame && get_bits1(&s->gb)) |
| 646 | pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb); |
| 647 | cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
| 648 | |
| 649 | if(s->alt_inter_vlc==0 || (cbpc & 3)!=3) |
| 650 | cbpy ^= 0xF; |
| 651 | |
| 652 | cbp = (cbpc & 3) | (cbpy << 2); |
| 653 | if (dquant) { |
| 654 | h263_decode_dquant(s); |
| 655 | } |
| 656 | |
| 657 | s->mv_dir = MV_DIR_FORWARD; |
| 658 | if ((cbpc & 16) == 0) { |
| 659 | s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0; |
| 660 | /* 16x16 motion prediction */ |
| 661 | s->mv_type = MV_TYPE_16X16; |
| 662 | ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); |
| 663 | if (s->umvplus) |
| 664 | mx = h263p_decode_umotion(s, pred_x); |
| 665 | else |
| 666 | mx = ff_h263_decode_motion(s, pred_x, 1); |
| 667 | |
| 668 | if (mx >= 0xffff) |
| 669 | return -1; |
| 670 | |
| 671 | if (s->umvplus) |
| 672 | my = h263p_decode_umotion(s, pred_y); |
| 673 | else |
| 674 | my = ff_h263_decode_motion(s, pred_y, 1); |
| 675 | |
| 676 | if (my >= 0xffff) |
| 677 | return -1; |
| 678 | s->mv[0][0][0] = mx; |
| 679 | s->mv[0][0][1] = my; |
| 680 | |
| 681 | if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1) |
| 682 | skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */ |
| 683 | } else { |
| 684 | s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0; |
| 685 | s->mv_type = MV_TYPE_8X8; |
| 686 | for(i=0;i<4;i++) { |
| 687 | mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); |
| 688 | if (s->umvplus) |
| 689 | mx = h263p_decode_umotion(s, pred_x); |
| 690 | else |
| 691 | mx = ff_h263_decode_motion(s, pred_x, 1); |
| 692 | if (mx >= 0xffff) |
| 693 | return -1; |
| 694 | |
| 695 | if (s->umvplus) |
| 696 | my = h263p_decode_umotion(s, pred_y); |
| 697 | else |
| 698 | my = ff_h263_decode_motion(s, pred_y, 1); |
| 699 | if (my >= 0xffff) |
| 700 | return -1; |
| 701 | s->mv[0][i][0] = mx; |
| 702 | s->mv[0][i][1] = my; |
| 703 | if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1) |
| 704 | skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */ |
| 705 | mot_val[0] = mx; |
| 706 | mot_val[1] = my; |
| 707 | } |
| 708 | } |
| 709 | } else if(s->pict_type==AV_PICTURE_TYPE_B) { |
| 710 | int mb_type; |
| 711 | const int stride= s->b8_stride; |
| 712 | int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)]; |
| 713 | int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)]; |
| 714 | // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride; |
| 715 | |
| 716 | //FIXME ugly |
| 717 | mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]= |
| 718 | mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]= |
| 719 | mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]= |
| 720 | mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0; |
| 721 | |
| 722 | do{ |
| 723 | mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2); |
| 724 | if (mb_type < 0){ |
| 725 | av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y); |
| 726 | return -1; |
| 727 | } |
| 728 | |
| 729 | mb_type= h263_mb_type_b_map[ mb_type ]; |
| 730 | }while(!mb_type); |
| 731 | |
| 732 | s->mb_intra = IS_INTRA(mb_type); |
| 733 | if(HAS_CBP(mb_type)){ |
| 734 | s->bdsp.clear_blocks(s->block[0]); |
| 735 | cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1); |
| 736 | if(s->mb_intra){ |
| 737 | dquant = IS_QUANT(mb_type); |
| 738 | goto intra; |
| 739 | } |
| 740 | |
| 741 | cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
| 742 | |
| 743 | if (cbpy < 0){ |
| 744 | av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y); |
| 745 | return -1; |
| 746 | } |
| 747 | |
| 748 | if(s->alt_inter_vlc==0 || (cbpc & 3)!=3) |
| 749 | cbpy ^= 0xF; |
| 750 | |
| 751 | cbp = (cbpc & 3) | (cbpy << 2); |
| 752 | }else |
| 753 | cbp=0; |
| 754 | |
| 755 | av_assert2(!s->mb_intra); |
| 756 | |
| 757 | if(IS_QUANT(mb_type)){ |
| 758 | h263_decode_dquant(s); |
| 759 | } |
| 760 | |
| 761 | if(IS_DIRECT(mb_type)){ |
| 762 | s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT; |
| 763 | mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0); |
| 764 | }else{ |
| 765 | s->mv_dir = 0; |
| 766 | s->mv_type= MV_TYPE_16X16; |
| 767 | //FIXME UMV |
| 768 | |
| 769 | if(USES_LIST(mb_type, 0)){ |
| 770 | int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my); |
| 771 | s->mv_dir = MV_DIR_FORWARD; |
| 772 | |
| 773 | mx = ff_h263_decode_motion(s, mx, 1); |
| 774 | my = ff_h263_decode_motion(s, my, 1); |
| 775 | |
| 776 | s->mv[0][0][0] = mx; |
| 777 | s->mv[0][0][1] = my; |
| 778 | mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx; |
| 779 | mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my; |
| 780 | } |
| 781 | |
| 782 | if(USES_LIST(mb_type, 1)){ |
| 783 | int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my); |
| 784 | s->mv_dir |= MV_DIR_BACKWARD; |
| 785 | |
| 786 | mx = ff_h263_decode_motion(s, mx, 1); |
| 787 | my = ff_h263_decode_motion(s, my, 1); |
| 788 | |
| 789 | s->mv[1][0][0] = mx; |
| 790 | s->mv[1][0][1] = my; |
| 791 | mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx; |
| 792 | mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my; |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | s->current_picture.mb_type[xy] = mb_type; |
| 797 | } else { /* I-Frame */ |
| 798 | do{ |
| 799 | cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); |
| 800 | if (cbpc < 0){ |
| 801 | av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y); |
| 802 | return -1; |
| 803 | } |
| 804 | }while(cbpc == 8); |
| 805 | |
| 806 | s->bdsp.clear_blocks(s->block[0]); |
| 807 | |
| 808 | dquant = cbpc & 4; |
| 809 | s->mb_intra = 1; |
| 810 | intra: |
| 811 | s->current_picture.mb_type[xy] = MB_TYPE_INTRA; |
| 812 | if (s->h263_aic) { |
| 813 | s->ac_pred = get_bits1(&s->gb); |
| 814 | if(s->ac_pred){ |
| 815 | s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED; |
| 816 | |
| 817 | s->h263_aic_dir = get_bits1(&s->gb); |
| 818 | } |
| 819 | }else |
| 820 | s->ac_pred = 0; |
| 821 | |
| 822 | if(s->pb_frame && get_bits1(&s->gb)) |
| 823 | pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb); |
| 824 | cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
| 825 | if(cbpy<0){ |
| 826 | av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y); |
| 827 | return -1; |
| 828 | } |
| 829 | cbp = (cbpc & 3) | (cbpy << 2); |
| 830 | if (dquant) { |
| 831 | h263_decode_dquant(s); |
| 832 | } |
| 833 | |
| 834 | pb_mv_count += !!s->pb_frame; |
| 835 | } |
| 836 | |
| 837 | while(pb_mv_count--){ |
| 838 | ff_h263_decode_motion(s, 0, 1); |
| 839 | ff_h263_decode_motion(s, 0, 1); |
| 840 | } |
| 841 | |
| 842 | /* decode each block */ |
| 843 | for (i = 0; i < 6; i++) { |
| 844 | if (h263_decode_block(s, block[i], i, cbp&32) < 0) |
| 845 | return -1; |
| 846 | cbp+=cbp; |
| 847 | } |
| 848 | |
| 849 | if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0) |
| 850 | return -1; |
| 851 | if(s->obmc && !s->mb_intra){ |
| 852 | if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1) |
| 853 | preview_obmc(s); |
| 854 | } |
| 855 | end: |
| 856 | |
| 857 | /* per-MB end of slice check */ |
| 858 | { |
| 859 | int v= show_bits(&s->gb, 16); |
| 860 | |
| 861 | if (get_bits_left(&s->gb) < 16) { |
| 862 | v >>= 16 - get_bits_left(&s->gb); |
| 863 | } |
| 864 | |
| 865 | if(v==0) |
| 866 | return SLICE_END; |
| 867 | } |
| 868 | |
| 869 | return SLICE_OK; |
| 870 | } |
| 871 | |
| 872 | /* most is hardcoded. should extend to handle all h263 streams */ |
| 873 | int ff_h263_decode_picture_header(MpegEncContext *s) |
| 874 | { |
| 875 | int format, width, height, i; |
| 876 | uint32_t startcode; |
| 877 | |
| 878 | align_get_bits(&s->gb); |
| 879 | |
| 880 | if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) { |
| 881 | av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n"); |
| 882 | } |
| 883 | |
| 884 | startcode= get_bits(&s->gb, 22-8); |
| 885 | |
| 886 | for(i= get_bits_left(&s->gb); i>24; i-=8) { |
| 887 | startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF; |
| 888 | |
| 889 | if(startcode == 0x20) |
| 890 | break; |
| 891 | } |
| 892 | |
| 893 | if (startcode != 0x20) { |
| 894 | av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n"); |
| 895 | return -1; |
| 896 | } |
| 897 | /* temporal reference */ |
| 898 | i = get_bits(&s->gb, 8); /* picture timestamp */ |
| 899 | if( (s->picture_number&~0xFF)+i < s->picture_number) |
| 900 | i+= 256; |
| 901 | s->picture_number= (s->picture_number&~0xFF) + i; |
| 902 | |
| 903 | /* PTYPE starts here */ |
| 904 | if (get_bits1(&s->gb) != 1) { |
| 905 | /* marker */ |
| 906 | av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n"); |
| 907 | return -1; |
| 908 | } |
| 909 | if (get_bits1(&s->gb) != 0) { |
| 910 | av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n"); |
| 911 | return -1; /* h263 id */ |
| 912 | } |
| 913 | skip_bits1(&s->gb); /* split screen off */ |
| 914 | skip_bits1(&s->gb); /* camera off */ |
| 915 | skip_bits1(&s->gb); /* freeze picture release off */ |
| 916 | |
| 917 | format = get_bits(&s->gb, 3); |
| 918 | /* |
| 919 | 0 forbidden |
| 920 | 1 sub-QCIF |
| 921 | 10 QCIF |
| 922 | 7 extended PTYPE (PLUSPTYPE) |
| 923 | */ |
| 924 | |
| 925 | if (format != 7 && format != 6) { |
| 926 | s->h263_plus = 0; |
| 927 | /* H.263v1 */ |
| 928 | width = ff_h263_format[format][0]; |
| 929 | height = ff_h263_format[format][1]; |
| 930 | if (!width) |
| 931 | return -1; |
| 932 | |
| 933 | s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb); |
| 934 | |
| 935 | s->h263_long_vectors = get_bits1(&s->gb); |
| 936 | |
| 937 | if (get_bits1(&s->gb) != 0) { |
| 938 | av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n"); |
| 939 | return -1; /* SAC: off */ |
| 940 | } |
| 941 | s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */ |
| 942 | s->unrestricted_mv = s->h263_long_vectors || s->obmc; |
| 943 | |
| 944 | s->pb_frame = get_bits1(&s->gb); |
| 945 | s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); |
| 946 | skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */ |
| 947 | |
| 948 | s->width = width; |
| 949 | s->height = height; |
| 950 | s->avctx->sample_aspect_ratio= (AVRational){12,11}; |
| 951 | s->avctx->time_base= (AVRational){1001, 30000}; |
| 952 | } else { |
| 953 | int ufep; |
| 954 | |
| 955 | /* H.263v2 */ |
| 956 | s->h263_plus = 1; |
| 957 | ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */ |
| 958 | |
| 959 | /* ufep other than 0 and 1 are reserved */ |
| 960 | if (ufep == 1) { |
| 961 | /* OPPTYPE */ |
| 962 | format = get_bits(&s->gb, 3); |
| 963 | av_dlog(s->avctx, "ufep=1, format: %d\n", format); |
| 964 | s->custom_pcf= get_bits1(&s->gb); |
| 965 | s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */ |
| 966 | if (get_bits1(&s->gb) != 0) { |
| 967 | av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n"); |
| 968 | } |
| 969 | s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */ |
| 970 | s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */ |
| 971 | s->loop_filter= get_bits1(&s->gb); |
| 972 | s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter; |
| 973 | if(s->avctx->lowres) |
| 974 | s->loop_filter = 0; |
| 975 | |
| 976 | s->h263_slice_structured= get_bits1(&s->gb); |
| 977 | if (get_bits1(&s->gb) != 0) { |
| 978 | av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n"); |
| 979 | } |
| 980 | if (get_bits1(&s->gb) != 0) { |
| 981 | av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n"); |
| 982 | } |
| 983 | s->alt_inter_vlc= get_bits1(&s->gb); |
| 984 | s->modified_quant= get_bits1(&s->gb); |
| 985 | if(s->modified_quant) |
| 986 | s->chroma_qscale_table= ff_h263_chroma_qscale_table; |
| 987 | |
| 988 | skip_bits(&s->gb, 1); /* Prevent start code emulation */ |
| 989 | |
| 990 | skip_bits(&s->gb, 3); /* Reserved */ |
| 991 | } else if (ufep != 0) { |
| 992 | av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep); |
| 993 | return -1; |
| 994 | } |
| 995 | |
| 996 | /* MPPTYPE */ |
| 997 | s->pict_type = get_bits(&s->gb, 3); |
| 998 | switch(s->pict_type){ |
| 999 | case 0: s->pict_type= AV_PICTURE_TYPE_I;break; |
| 1000 | case 1: s->pict_type= AV_PICTURE_TYPE_P;break; |
| 1001 | case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break; |
| 1002 | case 3: s->pict_type= AV_PICTURE_TYPE_B;break; |
| 1003 | case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO |
| 1004 | default: |
| 1005 | return -1; |
| 1006 | } |
| 1007 | skip_bits(&s->gb, 2); |
| 1008 | s->no_rounding = get_bits1(&s->gb); |
| 1009 | skip_bits(&s->gb, 4); |
| 1010 | |
| 1011 | /* Get the picture dimensions */ |
| 1012 | if (ufep) { |
| 1013 | if (format == 6) { |
| 1014 | /* Custom Picture Format (CPFMT) */ |
| 1015 | s->aspect_ratio_info = get_bits(&s->gb, 4); |
| 1016 | av_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info); |
| 1017 | /* aspect ratios: |
| 1018 | 0 - forbidden |
| 1019 | 1 - 1:1 |
| 1020 | 2 - 12:11 (CIF 4:3) |
| 1021 | 3 - 10:11 (525-type 4:3) |
| 1022 | 4 - 16:11 (CIF 16:9) |
| 1023 | 5 - 40:33 (525-type 16:9) |
| 1024 | 6-14 - reserved |
| 1025 | */ |
| 1026 | width = (get_bits(&s->gb, 9) + 1) * 4; |
| 1027 | skip_bits1(&s->gb); |
| 1028 | height = get_bits(&s->gb, 9) * 4; |
| 1029 | av_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height); |
| 1030 | if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) { |
| 1031 | /* aspected dimensions */ |
| 1032 | s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8); |
| 1033 | s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8); |
| 1034 | }else{ |
| 1035 | s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info]; |
| 1036 | } |
| 1037 | } else { |
| 1038 | width = ff_h263_format[format][0]; |
| 1039 | height = ff_h263_format[format][1]; |
| 1040 | s->avctx->sample_aspect_ratio= (AVRational){12,11}; |
| 1041 | } |
| 1042 | s->avctx->sample_aspect_ratio.den <<= s->ehc_mode; |
| 1043 | if ((width == 0) || (height == 0)) |
| 1044 | return -1; |
| 1045 | s->width = width; |
| 1046 | s->height = height; |
| 1047 | |
| 1048 | if(s->custom_pcf){ |
| 1049 | int gcd; |
| 1050 | s->avctx->time_base.den= 1800000; |
| 1051 | s->avctx->time_base.num= 1000 + get_bits1(&s->gb); |
| 1052 | s->avctx->time_base.num*= get_bits(&s->gb, 7); |
| 1053 | if(s->avctx->time_base.num == 0){ |
| 1054 | av_log(s, AV_LOG_ERROR, "zero framerate\n"); |
| 1055 | return -1; |
| 1056 | } |
| 1057 | gcd= av_gcd(s->avctx->time_base.den, s->avctx->time_base.num); |
| 1058 | s->avctx->time_base.den /= gcd; |
| 1059 | s->avctx->time_base.num /= gcd; |
| 1060 | }else{ |
| 1061 | s->avctx->time_base= (AVRational){1001, 30000}; |
| 1062 | } |
| 1063 | } |
| 1064 | |
| 1065 | if(s->custom_pcf){ |
| 1066 | skip_bits(&s->gb, 2); //extended Temporal reference |
| 1067 | } |
| 1068 | |
| 1069 | if (ufep) { |
| 1070 | if (s->umvplus) { |
| 1071 | if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */ |
| 1072 | skip_bits1(&s->gb); |
| 1073 | } |
| 1074 | if(s->h263_slice_structured){ |
| 1075 | if (get_bits1(&s->gb) != 0) { |
| 1076 | av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n"); |
| 1077 | } |
| 1078 | if (get_bits1(&s->gb) != 0) { |
| 1079 | av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n"); |
| 1080 | } |
| 1081 | } |
| 1082 | } |
| 1083 | |
| 1084 | s->qscale = get_bits(&s->gb, 5); |
| 1085 | } |
| 1086 | |
| 1087 | if (s->width == 0 || s->height == 0) { |
| 1088 | av_log(s->avctx, AV_LOG_ERROR, "dimensions 0\n"); |
| 1089 | return -1; |
| 1090 | } |
| 1091 | s->mb_width = (s->width + 15) / 16; |
| 1092 | s->mb_height = (s->height + 15) / 16; |
| 1093 | s->mb_num = s->mb_width * s->mb_height; |
| 1094 | |
| 1095 | if (s->pb_frame) { |
| 1096 | skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */ |
| 1097 | if (s->custom_pcf) |
| 1098 | skip_bits(&s->gb, 2); //extended Temporal reference |
| 1099 | skip_bits(&s->gb, 2); /* Quantization information for B-pictures */ |
| 1100 | } |
| 1101 | |
| 1102 | if (s->pict_type!=AV_PICTURE_TYPE_B) { |
| 1103 | s->time = s->picture_number; |
| 1104 | s->pp_time = s->time - s->last_non_b_time; |
| 1105 | s->last_non_b_time = s->time; |
| 1106 | }else{ |
| 1107 | s->time = s->picture_number; |
| 1108 | s->pb_time = s->pp_time - (s->last_non_b_time - s->time); |
| 1109 | if (s->pp_time <=s->pb_time || |
| 1110 | s->pp_time <= s->pp_time - s->pb_time || |
| 1111 | s->pp_time <= 0){ |
| 1112 | s->pp_time = 2; |
| 1113 | s->pb_time = 1; |
| 1114 | } |
| 1115 | ff_mpeg4_init_direct_mv(s); |
| 1116 | } |
| 1117 | |
| 1118 | /* PEI */ |
| 1119 | if (skip_1stop_8data_bits(&s->gb) < 0) |
| 1120 | return AVERROR_INVALIDDATA; |
| 1121 | |
| 1122 | if(s->h263_slice_structured){ |
| 1123 | if (get_bits1(&s->gb) != 1) { |
| 1124 | av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missing\n"); |
| 1125 | return -1; |
| 1126 | } |
| 1127 | |
| 1128 | ff_h263_decode_mba(s); |
| 1129 | |
| 1130 | if (get_bits1(&s->gb) != 1) { |
| 1131 | av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missing\n"); |
| 1132 | return -1; |
| 1133 | } |
| 1134 | } |
| 1135 | s->f_code = 1; |
| 1136 | |
| 1137 | if(s->h263_aic){ |
| 1138 | s->y_dc_scale_table= |
| 1139 | s->c_dc_scale_table= ff_aic_dc_scale_table; |
| 1140 | }else{ |
| 1141 | s->y_dc_scale_table= |
| 1142 | s->c_dc_scale_table= ff_mpeg1_dc_scale_table; |
| 1143 | } |
| 1144 | |
| 1145 | ff_h263_show_pict_info(s); |
| 1146 | if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){ |
| 1147 | int i,j; |
| 1148 | for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb)); |
| 1149 | av_log(s->avctx, AV_LOG_DEBUG, "\n"); |
| 1150 | for(i=0; i<13; i++){ |
| 1151 | for(j=0; j<3; j++){ |
| 1152 | int v= get_bits(&s->gb, 8); |
| 1153 | v |= get_sbits(&s->gb, 8)<<8; |
| 1154 | av_log(s->avctx, AV_LOG_DEBUG, " %5d", v); |
| 1155 | } |
| 1156 | av_log(s->avctx, AV_LOG_DEBUG, "\n"); |
| 1157 | } |
| 1158 | for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb)); |
| 1159 | } |
| 1160 | |
| 1161 | return 0; |
| 1162 | } |