1/* 2 * MPEG4 decoder. 3 * Copyright (c) 2000,2001 Fabrice Bellard 4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at> 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#include "mpegvideo.h" 24#include "mpeg4video.h" 25#include "h263.h" 26 27// The defines below define the number of bits that are read at once for 28// reading vlc values. Changing these may improve speed and data cache needs 29// be aware though that decreasing them may need the number of stages that is 30// passed to get_vlc* to be increased. 31#define SPRITE_TRAJ_VLC_BITS 6 32#define DC_VLC_BITS 9 33#define MB_TYPE_B_VLC_BITS 4 34 35 36static VLC dc_lum, dc_chrom; 37static VLC sprite_trajectory; 38static VLC mb_type_b_vlc; 39 40static const int mb_type_b_map[4]= { 41 MB_TYPE_DIRECT2 | MB_TYPE_L0L1, 42 MB_TYPE_L0L1 | MB_TYPE_16x16, 43 MB_TYPE_L1 | MB_TYPE_16x16, 44 MB_TYPE_L0 | MB_TYPE_16x16, 45}; 46 47/** 48 * predicts the ac. 49 * @param n block index (0-3 are luma, 4-5 are chroma) 50 * @param dir the ac prediction direction 51 */ 52void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n, 53 int dir) 54{ 55 int i; 56 int16_t *ac_val, *ac_val1; 57 int8_t * const qscale_table= s->current_picture.qscale_table; 58 59 /* find prediction */ 60 ac_val = s->ac_val[0][0] + s->block_index[n] * 16; 61 ac_val1 = ac_val; 62 if (s->ac_pred) { 63 if (dir == 0) { 64 const int xy= s->mb_x-1 + s->mb_y*s->mb_stride; 65 /* left prediction */ 66 ac_val -= 16; 67 68 if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){ 69 /* same qscale */ 70 for(i=1;i<8;i++) { 71 block[s->dsp.idct_permutation[i<<3]] += ac_val[i]; 72 } 73 }else{ 74 /* different qscale, we must rescale */ 75 for(i=1;i<8;i++) { 76 block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale); 77 } 78 } 79 } else { 80 const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride; 81 /* top prediction */ 82 ac_val -= 16 * s->block_wrap[n]; 83 84 if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){ 85 /* same qscale */ 86 for(i=1;i<8;i++) { 87 block[s->dsp.idct_permutation[i]] += ac_val[i + 8]; 88 } 89 }else{ 90 /* different qscale, we must rescale */ 91 for(i=1;i<8;i++) { 92 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale); 93 } 94 } 95 } 96 } 97 /* left copy */ 98 for(i=1;i<8;i++) 99 ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]]; 100 101 /* top copy */ 102 for(i=1;i<8;i++) 103 ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]]; 104 105} 106 107/** 108 * check if the next stuff is a resync marker or the end. 109 * @return 0 if not 110 */ 111static inline int mpeg4_is_resync(MpegEncContext *s){ 112 int bits_count= get_bits_count(&s->gb); 113 int v= show_bits(&s->gb, 16); 114 115 if(s->workaround_bugs&FF_BUG_NO_PADDING){ 116 return 0; 117 } 118 119 while(v<=0xFF){ 120 if(s->pict_type==FF_B_TYPE || (v>>(8-s->pict_type)!=1) || s->partitioned_frame) 121 break; 122 skip_bits(&s->gb, 8+s->pict_type); 123 bits_count+= 8+s->pict_type; 124 v= show_bits(&s->gb, 16); 125 } 126 127 if(bits_count + 8 >= s->gb.size_in_bits){ 128 v>>=8; 129 v|= 0x7F >> (7-(bits_count&7)); 130 131 if(v==0x7F) 132 return 1; 133 }else{ 134 if(v == ff_mpeg4_resync_prefix[bits_count&7]){ 135 int len; 136 GetBitContext gb= s->gb; 137 138 skip_bits(&s->gb, 1); 139 align_get_bits(&s->gb); 140 141 for(len=0; len<32; len++){ 142 if(get_bits1(&s->gb)) break; 143 } 144 145 s->gb= gb; 146 147 if(len>=ff_mpeg4_get_video_packet_prefix_length(s)) 148 return 1; 149 } 150 } 151 return 0; 152} 153 154static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb) 155{ 156 int i; 157 int a= 2<<s->sprite_warping_accuracy; 158 int rho= 3-s->sprite_warping_accuracy; 159 int r=16/a; 160 const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes 161 int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}}; 162 int sprite_ref[4][2]; 163 int virtual_ref[2][2]; 164 int w2, h2, w3, h3; 165 int alpha=0, beta=0; 166 int w= s->width; 167 int h= s->height; 168 int min_ab; 169 170 for(i=0; i<s->num_sprite_warping_points; i++){ 171 int length; 172 int x=0, y=0; 173 174 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); 175 if(length){ 176 x= get_xbits(gb, length); 177 } 178 if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */ 179 180 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); 181 if(length){ 182 y=get_xbits(gb, length); 183 } 184 skip_bits1(gb); /* marker bit */ 185 s->sprite_traj[i][0]= d[i][0]= x; 186 s->sprite_traj[i][1]= d[i][1]= y; 187 } 188 for(; i<4; i++) 189 s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0; 190 191 while((1<<alpha)<w) alpha++; 192 while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h' 193 w2= 1<<alpha; 194 h2= 1<<beta; 195 196// Note, the 4th point isn't used for GMC 197 if(s->divx_version==500 && s->divx_build==413){ 198 sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0]; 199 sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1]; 200 sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0]; 201 sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1]; 202 sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0]; 203 sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1]; 204 } else { 205 sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]); 206 sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]); 207 sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]); 208 sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]); 209 sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]); 210 sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]); 211 } 212/* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]); 213 sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */ 214 215// this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...) 216// perhaps it should be reordered to be more readable ... 217// the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides 218// so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form 219 virtual_ref[0][0]= 16*(vop_ref[0][0] + w2) 220 + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w); 221 virtual_ref[0][1]= 16*vop_ref[0][1] 222 + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w); 223 virtual_ref[1][0]= 16*vop_ref[0][0] 224 + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h); 225 virtual_ref[1][1]= 16*(vop_ref[0][1] + h2) 226 + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),h); 227 228 switch(s->num_sprite_warping_points) 229 { 230 case 0: 231 s->sprite_offset[0][0]= 0; 232 s->sprite_offset[0][1]= 0; 233 s->sprite_offset[1][0]= 0; 234 s->sprite_offset[1][1]= 0; 235 s->sprite_delta[0][0]= a; 236 s->sprite_delta[0][1]= 0; 237 s->sprite_delta[1][0]= 0; 238 s->sprite_delta[1][1]= a; 239 s->sprite_shift[0]= 0; 240 s->sprite_shift[1]= 0; 241 break; 242 case 1: //GMC only 243 s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0]; 244 s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1]; 245 s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2); 246 s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2); 247 s->sprite_delta[0][0]= a; 248 s->sprite_delta[0][1]= 0; 249 s->sprite_delta[1][0]= 0; 250 s->sprite_delta[1][1]= a; 251 s->sprite_shift[0]= 0; 252 s->sprite_shift[1]= 0; 253 break; 254 case 2: 255 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho)) 256 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0]) 257 + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1]) 258 + (1<<(alpha+rho-1)); 259 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho)) 260 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0]) 261 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1]) 262 + (1<<(alpha+rho-1)); 263 s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1) 264 +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1) 265 +2*w2*r*sprite_ref[0][0] 266 - 16*w2 267 + (1<<(alpha+rho+1))); 268 s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1) 269 +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1) 270 +2*w2*r*sprite_ref[0][1] 271 - 16*w2 272 + (1<<(alpha+rho+1))); 273 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]); 274 s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]); 275 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]); 276 s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]); 277 278 s->sprite_shift[0]= alpha+rho; 279 s->sprite_shift[1]= alpha+rho+2; 280 break; 281 case 3: 282 min_ab= FFMIN(alpha, beta); 283 w3= w2>>min_ab; 284 h3= h2>>min_ab; 285 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab)) 286 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0]) 287 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1]) 288 + (1<<(alpha+beta+rho-min_ab-1)); 289 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab)) 290 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0]) 291 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1]) 292 + (1<<(alpha+beta+rho-min_ab-1)); 293 s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1) 294 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1) 295 + 2*w2*h3*r*sprite_ref[0][0] 296 - 16*w2*h3 297 + (1<<(alpha+beta+rho-min_ab+1)); 298 s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1) 299 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1) 300 + 2*w2*h3*r*sprite_ref[0][1] 301 - 16*w2*h3 302 + (1<<(alpha+beta+rho-min_ab+1)); 303 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3; 304 s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3; 305 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3; 306 s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3; 307 308 s->sprite_shift[0]= alpha + beta + rho - min_ab; 309 s->sprite_shift[1]= alpha + beta + rho - min_ab + 2; 310 break; 311 } 312 /* try to simplify the situation */ 313 if( s->sprite_delta[0][0] == a<<s->sprite_shift[0] 314 && s->sprite_delta[0][1] == 0 315 && s->sprite_delta[1][0] == 0 316 && s->sprite_delta[1][1] == a<<s->sprite_shift[0]) 317 { 318 s->sprite_offset[0][0]>>=s->sprite_shift[0]; 319 s->sprite_offset[0][1]>>=s->sprite_shift[0]; 320 s->sprite_offset[1][0]>>=s->sprite_shift[1]; 321 s->sprite_offset[1][1]>>=s->sprite_shift[1]; 322 s->sprite_delta[0][0]= a; 323 s->sprite_delta[0][1]= 0; 324 s->sprite_delta[1][0]= 0; 325 s->sprite_delta[1][1]= a; 326 s->sprite_shift[0]= 0; 327 s->sprite_shift[1]= 0; 328 s->real_sprite_warping_points=1; 329 } 330 else{ 331 int shift_y= 16 - s->sprite_shift[0]; 332 int shift_c= 16 - s->sprite_shift[1]; 333 for(i=0; i<2; i++){ 334 s->sprite_offset[0][i]<<= shift_y; 335 s->sprite_offset[1][i]<<= shift_c; 336 s->sprite_delta[0][i]<<= shift_y; 337 s->sprite_delta[1][i]<<= shift_y; 338 s->sprite_shift[i]= 16; 339 } 340 s->real_sprite_warping_points= s->num_sprite_warping_points; 341 } 342} 343 344/** 345 * decodes the next video packet. 346 * @return <0 if something went wrong 347 */ 348int mpeg4_decode_video_packet_header(MpegEncContext *s) 349{ 350 int mb_num_bits= av_log2(s->mb_num - 1) + 1; 351 int header_extension=0, mb_num, len; 352 353 /* is there enough space left for a video packet + header */ 354 if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1; 355 356 for(len=0; len<32; len++){ 357 if(get_bits1(&s->gb)) break; 358 } 359 360 if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){ 361 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n"); 362 return -1; 363 } 364 365 if(s->shape != RECT_SHAPE){ 366 header_extension= get_bits1(&s->gb); 367 //FIXME more stuff here 368 } 369 370 mb_num= get_bits(&s->gb, mb_num_bits); 371 if(mb_num>=s->mb_num){ 372 av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num); 373 return -1; 374 } 375 if(s->pict_type == FF_B_TYPE){ 376 while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) mb_num++; 377 if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded 378 } 379 380 s->mb_x= mb_num % s->mb_width; 381 s->mb_y= mb_num / s->mb_width; 382 383 if(s->shape != BIN_ONLY_SHAPE){ 384 int qscale= get_bits(&s->gb, s->quant_precision); 385 if(qscale) 386 s->chroma_qscale=s->qscale= qscale; 387 } 388 389 if(s->shape == RECT_SHAPE){ 390 header_extension= get_bits1(&s->gb); 391 } 392 if(header_extension){ 393 int time_increment; 394 int time_incr=0; 395 396 while (get_bits1(&s->gb) != 0) 397 time_incr++; 398 399 check_marker(&s->gb, "before time_increment in video packed header"); 400 time_increment= get_bits(&s->gb, s->time_increment_bits); 401 check_marker(&s->gb, "before vop_coding_type in video packed header"); 402 403 skip_bits(&s->gb, 2); /* vop coding type */ 404 //FIXME not rect stuff here 405 406 if(s->shape != BIN_ONLY_SHAPE){ 407 skip_bits(&s->gb, 3); /* intra dc vlc threshold */ 408//FIXME don't just ignore everything 409 if(s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){ 410 mpeg4_decode_sprite_trajectory(s, &s->gb); 411 av_log(s->avctx, AV_LOG_ERROR, "untested\n"); 412 } 413 414 //FIXME reduced res stuff here 415 416 if (s->pict_type != FF_I_TYPE) { 417 int f_code = get_bits(&s->gb, 3); /* fcode_for */ 418 if(f_code==0){ 419 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n"); 420 } 421 } 422 if (s->pict_type == FF_B_TYPE) { 423 int b_code = get_bits(&s->gb, 3); 424 if(b_code==0){ 425 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n"); 426 } 427 } 428 } 429 } 430 //FIXME new-pred stuff 431 432 return 0; 433} 434 435/** 436 * gets the average motion vector for a GMC MB. 437 * @param n either 0 for the x component or 1 for y 438 * @return the average MV for a GMC MB 439 */ 440static inline int get_amv(MpegEncContext *s, int n){ 441 int x, y, mb_v, sum, dx, dy, shift; 442 int len = 1 << (s->f_code + 4); 443 const int a= s->sprite_warping_accuracy; 444 445 if(s->workaround_bugs & FF_BUG_AMV) 446 len >>= s->quarter_sample; 447 448 if(s->real_sprite_warping_points==1){ 449 if(s->divx_version==500 && s->divx_build==413) 450 sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample)); 451 else 452 sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a); 453 }else{ 454 dx= s->sprite_delta[n][0]; 455 dy= s->sprite_delta[n][1]; 456 shift= s->sprite_shift[0]; 457 if(n) dy -= 1<<(shift + a + 1); 458 else dx -= 1<<(shift + a + 1); 459 mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16; 460 461 sum=0; 462 for(y=0; y<16; y++){ 463 int v; 464 465 v= mb_v + dy*y; 466 //XXX FIXME optimize 467 for(x=0; x<16; x++){ 468 sum+= v>>shift; 469 v+= dx; 470 } 471 } 472 sum= RSHIFT(sum, a+8-s->quarter_sample); 473 } 474 475 if (sum < -len) sum= -len; 476 else if (sum >= len) sum= len-1; 477 478 return sum; 479} 480 481/** 482 * decodes the dc value. 483 * @param n block index (0-3 are luma, 4-5 are chroma) 484 * @param dir_ptr the prediction direction will be stored here 485 * @return the quantized dc 486 */ 487static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr) 488{ 489 int level, code; 490 491 if (n < 4) 492 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1); 493 else 494 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1); 495 if (code < 0 || code > 9 /* && s->nbit<9 */){ 496 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n"); 497 return -1; 498 } 499 if (code == 0) { 500 level = 0; 501 } else { 502 if(IS_3IV1){ 503 if(code==1) 504 level= 2*get_bits1(&s->gb)-1; 505 else{ 506 if(get_bits1(&s->gb)) 507 level = get_bits(&s->gb, code-1) + (1<<(code-1)); 508 else 509 level = -get_bits(&s->gb, code-1) - (1<<(code-1)); 510 } 511 }else{ 512 level = get_xbits(&s->gb, code); 513 } 514 515 if (code > 8){ 516 if(get_bits1(&s->gb)==0){ /* marker */ 517 if(s->error_recognition>=2){ 518 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n"); 519 return -1; 520 } 521 } 522 } 523 } 524 525 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0); 526} 527 528/** 529 * decodes first partition. 530 * @return number of MBs decoded or <0 if an error occurred 531 */ 532static int mpeg4_decode_partition_a(MpegEncContext *s){ 533 int mb_num; 534 static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; 535 536 /* decode first partition */ 537 mb_num=0; 538 s->first_slice_line=1; 539 for(; s->mb_y<s->mb_height; s->mb_y++){ 540 ff_init_block_index(s); 541 for(; s->mb_x<s->mb_width; s->mb_x++){ 542 const int xy= s->mb_x + s->mb_y*s->mb_stride; 543 int cbpc; 544 int dir=0; 545 546 mb_num++; 547 ff_update_block_index(s); 548 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1) 549 s->first_slice_line=0; 550 551 if(s->pict_type==FF_I_TYPE){ 552 int i; 553 554 do{ 555 if(show_bits_long(&s->gb, 19)==DC_MARKER){ 556 return mb_num-1; 557 } 558 559 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); 560 if (cbpc < 0){ 561 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y); 562 return -1; 563 } 564 }while(cbpc == 8); 565 566 s->cbp_table[xy]= cbpc & 3; 567 s->current_picture.mb_type[xy]= MB_TYPE_INTRA; 568 s->mb_intra = 1; 569 570 if(cbpc & 4) { 571 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 572 } 573 s->current_picture.qscale_table[xy]= s->qscale; 574 575 s->mbintra_table[xy]= 1; 576 for(i=0; i<6; i++){ 577 int dc_pred_dir; 578 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir); 579 if(dc < 0){ 580 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y); 581 return -1; 582 } 583 dir<<=1; 584 if(dc_pred_dir) dir|=1; 585 } 586 s->pred_dir_table[xy]= dir; 587 }else{ /* P/S_TYPE */ 588 int mx, my, pred_x, pred_y, bits; 589 int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]]; 590 const int stride= s->b8_stride*2; 591 592try_again: 593 bits= show_bits(&s->gb, 17); 594 if(bits==MOTION_MARKER){ 595 return mb_num-1; 596 } 597 skip_bits1(&s->gb); 598 if(bits&0x10000){ 599 /* skip mb */ 600 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){ 601 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0; 602 mx= get_amv(s, 0); 603 my= get_amv(s, 1); 604 }else{ 605 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; 606 mx=my=0; 607 } 608 mot_val[0 ]= mot_val[2 ]= 609 mot_val[0+stride]= mot_val[2+stride]= mx; 610 mot_val[1 ]= mot_val[3 ]= 611 mot_val[1+stride]= mot_val[3+stride]= my; 612 613 if(s->mbintra_table[xy]) 614 ff_clean_intra_table_entries(s); 615 continue; 616 } 617 618 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); 619 if (cbpc < 0){ 620 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y); 621 return -1; 622 } 623 if(cbpc == 20) 624 goto try_again; 625 626 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant 627 628 s->mb_intra = ((cbpc & 4) != 0); 629 630 if(s->mb_intra){ 631 s->current_picture.mb_type[xy]= MB_TYPE_INTRA; 632 s->mbintra_table[xy]= 1; 633 mot_val[0 ]= mot_val[2 ]= 634 mot_val[0+stride]= mot_val[2+stride]= 0; 635 mot_val[1 ]= mot_val[3 ]= 636 mot_val[1+stride]= mot_val[3+stride]= 0; 637 }else{ 638 if(s->mbintra_table[xy]) 639 ff_clean_intra_table_entries(s); 640 641 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0) 642 s->mcsel= get_bits1(&s->gb); 643 else s->mcsel= 0; 644 645 if ((cbpc & 16) == 0) { 646 /* 16x16 motion prediction */ 647 648 h263_pred_motion(s, 0, 0, &pred_x, &pred_y); 649 if(!s->mcsel){ 650 mx = h263_decode_motion(s, pred_x, s->f_code); 651 if (mx >= 0xffff) 652 return -1; 653 654 my = h263_decode_motion(s, pred_y, s->f_code); 655 if (my >= 0xffff) 656 return -1; 657 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0; 658 } else { 659 mx = get_amv(s, 0); 660 my = get_amv(s, 1); 661 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0; 662 } 663 664 mot_val[0 ]= mot_val[2 ] = 665 mot_val[0+stride]= mot_val[2+stride]= mx; 666 mot_val[1 ]= mot_val[3 ]= 667 mot_val[1+stride]= mot_val[3+stride]= my; 668 } else { 669 int i; 670 s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0; 671 for(i=0;i<4;i++) { 672 int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y); 673 mx = h263_decode_motion(s, pred_x, s->f_code); 674 if (mx >= 0xffff) 675 return -1; 676 677 my = h263_decode_motion(s, pred_y, s->f_code); 678 if (my >= 0xffff) 679 return -1; 680 mot_val[0] = mx; 681 mot_val[1] = my; 682 } 683 } 684 } 685 } 686 } 687 s->mb_x= 0; 688 } 689 690 return mb_num; 691} 692 693/** 694 * decode second partition. 695 * @return <0 if an error occurred 696 */ 697static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){ 698 int mb_num=0; 699 static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; 700 701 s->mb_x= s->resync_mb_x; 702 s->first_slice_line=1; 703 for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){ 704 ff_init_block_index(s); 705 for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){ 706 const int xy= s->mb_x + s->mb_y*s->mb_stride; 707 708 mb_num++; 709 ff_update_block_index(s); 710 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1) 711 s->first_slice_line=0; 712 713 if(s->pict_type==FF_I_TYPE){ 714 int ac_pred= get_bits1(&s->gb); 715 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); 716 if(cbpy<0){ 717 av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); 718 return -1; 719 } 720 721 s->cbp_table[xy]|= cbpy<<2; 722 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED; 723 }else{ /* P || S_TYPE */ 724 if(IS_INTRA(s->current_picture.mb_type[xy])){ 725 int dir=0,i; 726 int ac_pred = get_bits1(&s->gb); 727 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); 728 729 if(cbpy<0){ 730 av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); 731 return -1; 732 } 733 734 if(s->cbp_table[xy] & 8) { 735 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 736 } 737 s->current_picture.qscale_table[xy]= s->qscale; 738 739 for(i=0; i<6; i++){ 740 int dc_pred_dir; 741 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir); 742 if(dc < 0){ 743 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y); 744 return -1; 745 } 746 dir<<=1; 747 if(dc_pred_dir) dir|=1; 748 } 749 s->cbp_table[xy]&= 3; //remove dquant 750 s->cbp_table[xy]|= cbpy<<2; 751 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED; 752 s->pred_dir_table[xy]= dir; 753 }else if(IS_SKIP(s->current_picture.mb_type[xy])){ 754 s->current_picture.qscale_table[xy]= s->qscale; 755 s->cbp_table[xy]= 0; 756 }else{ 757 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); 758 759 if(cbpy<0){ 760 av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); 761 return -1; 762 } 763 764 if(s->cbp_table[xy] & 8) { 765 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 766 } 767 s->current_picture.qscale_table[xy]= s->qscale; 768 769 s->cbp_table[xy]&= 3; //remove dquant 770 s->cbp_table[xy]|= (cbpy^0xf)<<2; 771 } 772 } 773 } 774 if(mb_num >= mb_count) return 0; 775 s->mb_x= 0; 776 } 777 return 0; 778} 779 780/** 781 * decodes the first & second partition 782 * @return <0 if error (and sets error type in the error_status_table) 783 */ 784int ff_mpeg4_decode_partitions(MpegEncContext *s) 785{ 786 int mb_num; 787 const int part_a_error= s->pict_type==FF_I_TYPE ? (DC_ERROR|MV_ERROR) : MV_ERROR; 788 const int part_a_end = s->pict_type==FF_I_TYPE ? (DC_END |MV_END) : MV_END; 789 790 mb_num= mpeg4_decode_partition_a(s); 791 if(mb_num<0){ 792 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error); 793 return -1; 794 } 795 796 if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){ 797 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n"); 798 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error); 799 return -1; 800 } 801 802 s->mb_num_left= mb_num; 803 804 if(s->pict_type==FF_I_TYPE){ 805 while(show_bits(&s->gb, 9) == 1) 806 skip_bits(&s->gb, 9); 807 if(get_bits_long(&s->gb, 19)!=DC_MARKER){ 808 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y); 809 return -1; 810 } 811 }else{ 812 while(show_bits(&s->gb, 10) == 1) 813 skip_bits(&s->gb, 10); 814 if(get_bits(&s->gb, 17)!=MOTION_MARKER){ 815 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y); 816 return -1; 817 } 818 } 819 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end); 820 821 if( mpeg4_decode_partition_b(s, mb_num) < 0){ 822 if(s->pict_type==FF_P_TYPE) 823 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR); 824 return -1; 825 }else{ 826 if(s->pict_type==FF_P_TYPE) 827 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END); 828 } 829 830 return 0; 831} 832 833/** 834 * decodes a block. 835 * @return <0 if an error occurred 836 */ 837static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block, 838 int n, int coded, int intra, int rvlc) 839{ 840 int level, i, last, run; 841 int dc_pred_dir; 842 RLTable * rl; 843 RL_VLC_ELEM * rl_vlc; 844 const uint8_t * scan_table; 845 int qmul, qadd; 846 847 //Note intra & rvlc should be optimized away if this is inlined 848 849 if(intra) { 850 if(s->use_intra_dc_vlc){ 851 /* DC coef */ 852 if(s->partitioned_frame){ 853 level = s->dc_val[0][ s->block_index[n] ]; 854 if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale); 855 else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale); 856 dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32; 857 }else{ 858 level = mpeg4_decode_dc(s, n, &dc_pred_dir); 859 if (level < 0) 860 return -1; 861 } 862 block[0] = level; 863 i = 0; 864 }else{ 865 i = -1; 866 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0); 867 } 868 if (!coded) 869 goto not_coded; 870 871 if(rvlc){ 872 rl = &rvlc_rl_intra; 873 rl_vlc = rvlc_rl_intra.rl_vlc[0]; 874 }else{ 875 rl = &ff_mpeg4_rl_intra; 876 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0]; 877 } 878 if (s->ac_pred) { 879 if (dc_pred_dir == 0) 880 scan_table = s->intra_v_scantable.permutated; /* left */ 881 else 882 scan_table = s->intra_h_scantable.permutated; /* top */ 883 } else { 884 scan_table = s->intra_scantable.permutated; 885 } 886 qmul=1; 887 qadd=0; 888 } else { 889 i = -1; 890 if (!coded) { 891 s->block_last_index[n] = i; 892 return 0; 893 } 894 if(rvlc) rl = &rvlc_rl_inter; 895 else rl = &ff_h263_rl_inter; 896 897 scan_table = s->intra_scantable.permutated; 898 899 if(s->mpeg_quant){ 900 qmul=1; 901 qadd=0; 902 if(rvlc){ 903 rl_vlc = rvlc_rl_inter.rl_vlc[0]; 904 }else{ 905 rl_vlc = ff_h263_rl_inter.rl_vlc[0]; 906 } 907 }else{ 908 qmul = s->qscale << 1; 909 qadd = (s->qscale - 1) | 1; 910 if(rvlc){ 911 rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale]; 912 }else{ 913 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale]; 914 } 915 } 916 } 917 { 918 OPEN_READER(re, &s->gb); 919 for(;;) { 920 UPDATE_CACHE(re, &s->gb); 921 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0); 922 if (level==0) { 923 /* escape */ 924 if(rvlc){ 925 if(SHOW_UBITS(re, &s->gb, 1)==0){ 926 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n"); 927 return -1; 928 }; SKIP_CACHE(re, &s->gb, 1); 929 930 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); 931 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6); 932 SKIP_COUNTER(re, &s->gb, 1+1+6); 933 UPDATE_CACHE(re, &s->gb); 934 935 if(SHOW_UBITS(re, &s->gb, 1)==0){ 936 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n"); 937 return -1; 938 }; SKIP_CACHE(re, &s->gb, 1); 939 940 level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11); 941 942 if(SHOW_UBITS(re, &s->gb, 5)!=0x10){ 943 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n"); 944 return -1; 945 }; SKIP_CACHE(re, &s->gb, 5); 946 947 level= level * qmul + qadd; 948 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1); 949 SKIP_COUNTER(re, &s->gb, 1+11+5+1); 950 951 i+= run + 1; 952 if(last) i+=192; 953 }else{ 954 int cache; 955 cache= GET_CACHE(re, &s->gb); 956 957 if(IS_3IV1) 958 cache ^= 0xC0000000; 959 960 if (cache&0x80000000) { 961 if (cache&0x40000000) { 962 /* third escape */ 963 SKIP_CACHE(re, &s->gb, 2); 964 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); 965 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6); 966 SKIP_COUNTER(re, &s->gb, 2+1+6); 967 UPDATE_CACHE(re, &s->gb); 968 969 if(IS_3IV1){ 970 level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12); 971 }else{ 972 if(SHOW_UBITS(re, &s->gb, 1)==0){ 973 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n"); 974 return -1; 975 }; SKIP_CACHE(re, &s->gb, 1); 976 977 level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12); 978 979 if(SHOW_UBITS(re, &s->gb, 1)==0){ 980 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n"); 981 return -1; 982 }; LAST_SKIP_CACHE(re, &s->gb, 1); 983 984 SKIP_COUNTER(re, &s->gb, 1+12+1); 985 } 986 987#if 0 988 if(s->error_recognition >= FF_ER_COMPLIANT){ 989 const int abs_level= FFABS(level); 990 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){ 991 const int run1= run - rl->max_run[last][abs_level] - 1; 992 if(abs_level <= rl->max_level[last][run]){ 993 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n"); 994 return -1; 995 } 996 if(s->error_recognition > FF_ER_COMPLIANT){ 997 if(abs_level <= rl->max_level[last][run]*2){ 998 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n"); 999 return -1; 1000 } 1001 if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){ 1002 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n"); 1003 return -1; 1004 } 1005 } 1006 } 1007 } 1008#endif 1009 if (level>0) level= level * qmul + qadd; 1010 else level= level * qmul - qadd; 1011 1012 if((unsigned)(level + 2048) > 4095){ 1013 if(s->error_recognition > FF_ER_COMPLIANT){ 1014 if(level > 2560 || level<-2560){ 1015 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale); 1016 return -1; 1017 } 1018 } 1019 level= level<0 ? -2048 : 2047; 1020 } 1021 1022 i+= run + 1; 1023 if(last) i+=192; 1024 } else { 1025 /* second escape */ 1026#if MIN_CACHE_BITS < 20 1027 LAST_SKIP_BITS(re, &s->gb, 2); 1028 UPDATE_CACHE(re, &s->gb); 1029#else 1030 SKIP_BITS(re, &s->gb, 2); 1031#endif 1032 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); 1033 i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing 1034 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 1035 LAST_SKIP_BITS(re, &s->gb, 1); 1036 } 1037 } else { 1038 /* first escape */ 1039#if MIN_CACHE_BITS < 19 1040 LAST_SKIP_BITS(re, &s->gb, 1); 1041 UPDATE_CACHE(re, &s->gb); 1042#else 1043 SKIP_BITS(re, &s->gb, 1); 1044#endif 1045 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); 1046 i+= run; 1047 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing 1048 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 1049 LAST_SKIP_BITS(re, &s->gb, 1); 1050 } 1051 } 1052 } else { 1053 i+= run; 1054 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 1055 LAST_SKIP_BITS(re, &s->gb, 1); 1056 } 1057 if (i > 62){ 1058 i-= 192; 1059 if(i&(~63)){ 1060 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); 1061 return -1; 1062 } 1063 1064 block[scan_table[i]] = level; 1065 break; 1066 } 1067 1068 block[scan_table[i]] = level; 1069 } 1070 CLOSE_READER(re, &s->gb); 1071 } 1072 not_coded: 1073 if (intra) { 1074 if(!s->use_intra_dc_vlc){ 1075 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0); 1076 1077 i -= i>>31; //if(i == -1) i=0; 1078 } 1079 1080 mpeg4_pred_ac(s, block, n, dc_pred_dir); 1081 if (s->ac_pred) { 1082 i = 63; /* XXX: not optimal */ 1083 } 1084 } 1085 s->block_last_index[n] = i; 1086 return 0; 1087} 1088 1089/** 1090 * decode partition C of one MB. 1091 * @return <0 if an error occurred 1092 */ 1093static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64]) 1094{ 1095 int cbp, mb_type; 1096 const int xy= s->mb_x + s->mb_y*s->mb_stride; 1097 1098 mb_type= s->current_picture.mb_type[xy]; 1099 cbp = s->cbp_table[xy]; 1100 1101 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold; 1102 1103 if(s->current_picture.qscale_table[xy] != s->qscale){ 1104 ff_set_qscale(s, s->current_picture.qscale_table[xy] ); 1105 } 1106 1107 if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) { 1108 int i; 1109 for(i=0; i<4; i++){ 1110 s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0]; 1111 s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1]; 1112 } 1113 s->mb_intra = IS_INTRA(mb_type); 1114 1115 if (IS_SKIP(mb_type)) { 1116 /* skip mb */ 1117 for(i=0;i<6;i++) 1118 s->block_last_index[i] = -1; 1119 s->mv_dir = MV_DIR_FORWARD; 1120 s->mv_type = MV_TYPE_16X16; 1121 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){ 1122 s->mcsel=1; 1123 s->mb_skipped = 0; 1124 }else{ 1125 s->mcsel=0; 1126 s->mb_skipped = 1; 1127 } 1128 }else if(s->mb_intra){ 1129 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]); 1130 }else if(!s->mb_intra){ 1131// s->mcsel= 0; //FIXME do we need to init that 1132 1133 s->mv_dir = MV_DIR_FORWARD; 1134 if (IS_8X8(mb_type)) { 1135 s->mv_type = MV_TYPE_8X8; 1136 } else { 1137 s->mv_type = MV_TYPE_16X16; 1138 } 1139 } 1140 } else { /* I-Frame */ 1141 s->mb_intra = 1; 1142 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]); 1143 } 1144 1145 if (!IS_SKIP(mb_type)) { 1146 int i; 1147 s->dsp.clear_blocks(s->block[0]); 1148 /* decode each block */ 1149 for (i = 0; i < 6; i++) { 1150 if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){ 1151 av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra); 1152 return -1; 1153 } 1154 cbp+=cbp; 1155 } 1156 } 1157 1158 /* per-MB end of slice check */ 1159 1160 if(--s->mb_num_left <= 0){ 1161 if(mpeg4_is_resync(s)) 1162 return SLICE_END; 1163 else 1164 return SLICE_NOEND; 1165 }else{ 1166 if(mpeg4_is_resync(s)){ 1167 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1; 1168 if(s->cbp_table[xy+delta]) 1169 return SLICE_END; 1170 } 1171 return SLICE_OK; 1172 } 1173} 1174 1175static int mpeg4_decode_mb(MpegEncContext *s, 1176 DCTELEM block[6][64]) 1177{ 1178 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant; 1179 int16_t *mot_val; 1180 static int8_t quant_tab[4] = { -1, -2, 1, 2 }; 1181 const int xy= s->mb_x + s->mb_y * s->mb_stride; 1182 1183 assert(s->h263_pred); 1184 1185 if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) { 1186 do{ 1187 if (get_bits1(&s->gb)) { 1188 /* skip mb */ 1189 s->mb_intra = 0; 1190 for(i=0;i<6;i++) 1191 s->block_last_index[i] = -1; 1192 s->mv_dir = MV_DIR_FORWARD; 1193 s->mv_type = MV_TYPE_16X16; 1194 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){ 1195 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0; 1196 s->mcsel=1; 1197 s->mv[0][0][0]= get_amv(s, 0); 1198 s->mv[0][0][1]= get_amv(s, 1); 1199 1200 s->mb_skipped = 0; 1201 }else{ 1202 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; 1203 s->mcsel=0; 1204 s->mv[0][0][0] = 0; 1205 s->mv[0][0][1] = 0; 1206 s->mb_skipped = 1; 1207 } 1208 goto end; 1209 } 1210 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); 1211 if (cbpc < 0){ 1212 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y); 1213 return -1; 1214 } 1215 }while(cbpc == 20); 1216 1217 s->dsp.clear_blocks(s->block[0]); 1218 dquant = cbpc & 8; 1219 s->mb_intra = ((cbpc & 4) != 0); 1220 if (s->mb_intra) goto intra; 1221 1222 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0) 1223 s->mcsel= get_bits1(&s->gb); 1224 else s->mcsel= 0; 1225 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F; 1226 1227 cbp = (cbpc & 3) | (cbpy << 2); 1228 if (dquant) { 1229 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 1230 } 1231 if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE))) 1232 s->interlaced_dct= get_bits1(&s->gb); 1233 1234 s->mv_dir = MV_DIR_FORWARD; 1235 if ((cbpc & 16) == 0) { 1236 if(s->mcsel){ 1237 s->current_picture.mb_type[xy]= MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0; 1238 /* 16x16 global motion prediction */ 1239 s->mv_type = MV_TYPE_16X16; 1240 mx= get_amv(s, 0); 1241 my= get_amv(s, 1); 1242 s->mv[0][0][0] = mx; 1243 s->mv[0][0][1] = my; 1244 }else if((!s->progressive_sequence) && get_bits1(&s->gb)){ 1245 s->current_picture.mb_type[xy]= MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED; 1246 /* 16x8 field motion prediction */ 1247 s->mv_type= MV_TYPE_FIELD; 1248 1249 s->field_select[0][0]= get_bits1(&s->gb); 1250 s->field_select[0][1]= get_bits1(&s->gb); 1251 1252 h263_pred_motion(s, 0, 0, &pred_x, &pred_y); 1253 1254 for(i=0; i<2; i++){ 1255 mx = h263_decode_motion(s, pred_x, s->f_code); 1256 if (mx >= 0xffff) 1257 return -1; 1258 1259 my = h263_decode_motion(s, pred_y/2, s->f_code); 1260 if (my >= 0xffff) 1261 return -1; 1262 1263 s->mv[0][i][0] = mx; 1264 s->mv[0][i][1] = my; 1265 } 1266 }else{ 1267 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0; 1268 /* 16x16 motion prediction */ 1269 s->mv_type = MV_TYPE_16X16; 1270 h263_pred_motion(s, 0, 0, &pred_x, &pred_y); 1271 mx = h263_decode_motion(s, pred_x, s->f_code); 1272 1273 if (mx >= 0xffff) 1274 return -1; 1275 1276 my = h263_decode_motion(s, pred_y, s->f_code); 1277 1278 if (my >= 0xffff) 1279 return -1; 1280 s->mv[0][0][0] = mx; 1281 s->mv[0][0][1] = my; 1282 } 1283 } else { 1284 s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0; 1285 s->mv_type = MV_TYPE_8X8; 1286 for(i=0;i<4;i++) { 1287 mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y); 1288 mx = h263_decode_motion(s, pred_x, s->f_code); 1289 if (mx >= 0xffff) 1290 return -1; 1291 1292 my = h263_decode_motion(s, pred_y, s->f_code); 1293 if (my >= 0xffff) 1294 return -1; 1295 s->mv[0][i][0] = mx; 1296 s->mv[0][i][1] = my; 1297 mot_val[0] = mx; 1298 mot_val[1] = my; 1299 } 1300 } 1301 } else if(s->pict_type==FF_B_TYPE) { 1302 int modb1; // first bit of modb 1303 int modb2; // second bit of modb 1304 int mb_type; 1305 1306 s->mb_intra = 0; //B-frames never contain intra blocks 1307 s->mcsel=0; // ... true gmc blocks 1308 1309 if(s->mb_x==0){ 1310 for(i=0; i<2; i++){ 1311 s->last_mv[i][0][0]= 1312 s->last_mv[i][0][1]= 1313 s->last_mv[i][1][0]= 1314 s->last_mv[i][1][1]= 0; 1315 } 1316 } 1317 1318 /* if we skipped it in the future P Frame than skip it now too */ 1319 s->mb_skipped= s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC 1320 1321 if(s->mb_skipped){ 1322 /* skip mb */ 1323 for(i=0;i<6;i++) 1324 s->block_last_index[i] = -1; 1325 1326 s->mv_dir = MV_DIR_FORWARD; 1327 s->mv_type = MV_TYPE_16X16; 1328 s->mv[0][0][0] = 0; 1329 s->mv[0][0][1] = 0; 1330 s->mv[1][0][0] = 0; 1331 s->mv[1][0][1] = 0; 1332 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; 1333 goto end; 1334 } 1335 1336 modb1= get_bits1(&s->gb); 1337 if(modb1){ 1338 mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded 1339 cbp=0; 1340 }else{ 1341 modb2= get_bits1(&s->gb); 1342 mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1); 1343 if(mb_type<0){ 1344 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n"); 1345 return -1; 1346 } 1347 mb_type= mb_type_b_map[ mb_type ]; 1348 if(modb2) cbp= 0; 1349 else{ 1350 s->dsp.clear_blocks(s->block[0]); 1351 cbp= get_bits(&s->gb, 6); 1352 } 1353 1354 if ((!IS_DIRECT(mb_type)) && cbp) { 1355 if(get_bits1(&s->gb)){ 1356 ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2); 1357 } 1358 } 1359 1360 if(!s->progressive_sequence){ 1361 if(cbp) 1362 s->interlaced_dct= get_bits1(&s->gb); 1363 1364 if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){ 1365 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 1366 mb_type &= ~MB_TYPE_16x16; 1367 1368 if(USES_LIST(mb_type, 0)){ 1369 s->field_select[0][0]= get_bits1(&s->gb); 1370 s->field_select[0][1]= get_bits1(&s->gb); 1371 } 1372 if(USES_LIST(mb_type, 1)){ 1373 s->field_select[1][0]= get_bits1(&s->gb); 1374 s->field_select[1][1]= get_bits1(&s->gb); 1375 } 1376 } 1377 } 1378 1379 s->mv_dir = 0; 1380 if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){ 1381 s->mv_type= MV_TYPE_16X16; 1382 1383 if(USES_LIST(mb_type, 0)){ 1384 s->mv_dir = MV_DIR_FORWARD; 1385 1386 mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code); 1387 my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code); 1388 s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx; 1389 s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my; 1390 } 1391 1392 if(USES_LIST(mb_type, 1)){ 1393 s->mv_dir |= MV_DIR_BACKWARD; 1394 1395 mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code); 1396 my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code); 1397 s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx; 1398 s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my; 1399 } 1400 }else if(!IS_DIRECT(mb_type)){ 1401 s->mv_type= MV_TYPE_FIELD; 1402 1403 if(USES_LIST(mb_type, 0)){ 1404 s->mv_dir = MV_DIR_FORWARD; 1405 1406 for(i=0; i<2; i++){ 1407 mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code); 1408 my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code); 1409 s->last_mv[0][i][0]= s->mv[0][i][0] = mx; 1410 s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2; 1411 } 1412 } 1413 1414 if(USES_LIST(mb_type, 1)){ 1415 s->mv_dir |= MV_DIR_BACKWARD; 1416 1417 for(i=0; i<2; i++){ 1418 mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code); 1419 my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code); 1420 s->last_mv[1][i][0]= s->mv[1][i][0] = mx; 1421 s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2; 1422 } 1423 } 1424 } 1425 } 1426 1427 if(IS_DIRECT(mb_type)){ 1428 if(IS_SKIP(mb_type)) 1429 mx=my=0; 1430 else{ 1431 mx = h263_decode_motion(s, 0, 1); 1432 my = h263_decode_motion(s, 0, 1); 1433 } 1434 1435 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT; 1436 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my); 1437 } 1438 s->current_picture.mb_type[xy]= mb_type; 1439 } else { /* I-Frame */ 1440 do{ 1441 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); 1442 if (cbpc < 0){ 1443 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y); 1444 return -1; 1445 } 1446 }while(cbpc == 8); 1447 1448 dquant = cbpc & 4; 1449 s->mb_intra = 1; 1450intra: 1451 s->ac_pred = get_bits1(&s->gb); 1452 if(s->ac_pred) 1453 s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED; 1454 else 1455 s->current_picture.mb_type[xy]= MB_TYPE_INTRA; 1456 1457 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); 1458 if(cbpy<0){ 1459 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y); 1460 return -1; 1461 } 1462 cbp = (cbpc & 3) | (cbpy << 2); 1463 1464 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold; 1465 1466 if (dquant) { 1467 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 1468 } 1469 1470 if(!s->progressive_sequence) 1471 s->interlaced_dct= get_bits1(&s->gb); 1472 1473 s->dsp.clear_blocks(s->block[0]); 1474 /* decode each block */ 1475 for (i = 0; i < 6; i++) { 1476 if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0) 1477 return -1; 1478 cbp+=cbp; 1479 } 1480 goto end; 1481 } 1482 1483 /* decode each block */ 1484 for (i = 0; i < 6; i++) { 1485 if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0) 1486 return -1; 1487 cbp+=cbp; 1488 } 1489end: 1490 1491 /* per-MB end of slice check */ 1492 if(s->codec_id==CODEC_ID_MPEG4){ 1493 if(mpeg4_is_resync(s)){ 1494 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1; 1495 if(s->pict_type==FF_B_TYPE && s->next_picture.mbskip_table[xy + delta]) 1496 return SLICE_OK; 1497 return SLICE_END; 1498 } 1499 } 1500 1501 return SLICE_OK; 1502} 1503 1504 1505static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){ 1506 int hours, minutes, seconds; 1507 1508 hours= get_bits(gb, 5); 1509 minutes= get_bits(gb, 6); 1510 skip_bits1(gb); 1511 seconds= get_bits(gb, 6); 1512 1513 s->time_base= seconds + 60*(minutes + 60*hours); 1514 1515 skip_bits1(gb); 1516 skip_bits1(gb); 1517 1518 return 0; 1519} 1520 1521static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){ 1522 int width, height, vo_ver_id; 1523 1524 /* vol header */ 1525 skip_bits(gb, 1); /* random access */ 1526 s->vo_type= get_bits(gb, 8); 1527 if (get_bits1(gb) != 0) { /* is_ol_id */ 1528 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */ 1529 skip_bits(gb, 3); /* vo_priority */ 1530 } else { 1531 vo_ver_id = 1; 1532 } 1533 s->aspect_ratio_info= get_bits(gb, 4); 1534 if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){ 1535 s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width 1536 s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height 1537 }else{ 1538 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info]; 1539 } 1540 1541 if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */ 1542 int chroma_format= get_bits(gb, 2); 1543 if(chroma_format!=CHROMA_420){ 1544 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n"); 1545 } 1546 s->low_delay= get_bits1(gb); 1547 if(get_bits1(gb)){ /* vbv parameters */ 1548 get_bits(gb, 15); /* first_half_bitrate */ 1549 skip_bits1(gb); /* marker */ 1550 get_bits(gb, 15); /* latter_half_bitrate */ 1551 skip_bits1(gb); /* marker */ 1552 get_bits(gb, 15); /* first_half_vbv_buffer_size */ 1553 skip_bits1(gb); /* marker */ 1554 get_bits(gb, 3); /* latter_half_vbv_buffer_size */ 1555 get_bits(gb, 11); /* first_half_vbv_occupancy */ 1556 skip_bits1(gb); /* marker */ 1557 get_bits(gb, 15); /* latter_half_vbv_occupancy */ 1558 skip_bits1(gb); /* marker */ 1559 } 1560 }else{ 1561 // set low delay flag only once the smartest? low delay detection won't be overriden 1562 if(s->picture_number==0) 1563 s->low_delay=0; 1564 } 1565 1566 s->shape = get_bits(gb, 2); /* vol shape */ 1567 if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n"); 1568 if(s->shape == GRAY_SHAPE && vo_ver_id != 1){ 1569 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n"); 1570 skip_bits(gb, 4); //video_object_layer_shape_extension 1571 } 1572 1573 check_marker(gb, "before time_increment_resolution"); 1574 1575 s->avctx->time_base.den = get_bits(gb, 16); 1576 if(!s->avctx->time_base.den){ 1577 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n"); 1578 return -1; 1579 } 1580 1581 s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1; 1582 if (s->time_increment_bits < 1) 1583 s->time_increment_bits = 1; 1584 1585 check_marker(gb, "before fixed_vop_rate"); 1586 1587 if (get_bits1(gb) != 0) { /* fixed_vop_rate */ 1588 s->avctx->time_base.num = get_bits(gb, s->time_increment_bits); 1589 }else 1590 s->avctx->time_base.num = 1; 1591 1592 s->t_frame=0; 1593 1594 if (s->shape != BIN_ONLY_SHAPE) { 1595 if (s->shape == RECT_SHAPE) { 1596 skip_bits1(gb); /* marker */ 1597 width = get_bits(gb, 13); 1598 skip_bits1(gb); /* marker */ 1599 height = get_bits(gb, 13); 1600 skip_bits1(gb); /* marker */ 1601 if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */ 1602 s->width = width; 1603 s->height = height; 1604 } 1605 } 1606 1607 s->progressive_sequence= 1608 s->progressive_frame= get_bits1(gb)^1; 1609 s->interlaced_dct=0; 1610 if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO)) 1611 av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */ 1612 if (vo_ver_id == 1) { 1613 s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */ 1614 } else { 1615 s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */ 1616 } 1617 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n"); 1618 if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){ 1619 if(s->vol_sprite_usage==STATIC_SPRITE){ 1620 s->sprite_width = get_bits(gb, 13); 1621 skip_bits1(gb); /* marker */ 1622 s->sprite_height= get_bits(gb, 13); 1623 skip_bits1(gb); /* marker */ 1624 s->sprite_left = get_bits(gb, 13); 1625 skip_bits1(gb); /* marker */ 1626 s->sprite_top = get_bits(gb, 13); 1627 skip_bits1(gb); /* marker */ 1628 } 1629 s->num_sprite_warping_points= get_bits(gb, 6); 1630 if(s->num_sprite_warping_points > 3){ 1631 av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points); 1632 s->num_sprite_warping_points= 0; 1633 return -1; 1634 } 1635 s->sprite_warping_accuracy = get_bits(gb, 2); 1636 s->sprite_brightness_change= get_bits1(gb); 1637 if(s->vol_sprite_usage==STATIC_SPRITE) 1638 s->low_latency_sprite= get_bits1(gb); 1639 } 1640 // FIXME sadct disable bit if verid!=1 && shape not rect 1641 1642 if (get_bits1(gb) == 1) { /* not_8_bit */ 1643 s->quant_precision = get_bits(gb, 4); /* quant_precision */ 1644 if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */ 1645 if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision); 1646 } else { 1647 s->quant_precision = 5; 1648 } 1649 1650 // FIXME a bunch of grayscale shape things 1651 1652 if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */ 1653 int i, v; 1654 1655 /* load default matrixes */ 1656 for(i=0; i<64; i++){ 1657 int j= s->dsp.idct_permutation[i]; 1658 v= ff_mpeg4_default_intra_matrix[i]; 1659 s->intra_matrix[j]= v; 1660 s->chroma_intra_matrix[j]= v; 1661 1662 v= ff_mpeg4_default_non_intra_matrix[i]; 1663 s->inter_matrix[j]= v; 1664 s->chroma_inter_matrix[j]= v; 1665 } 1666 1667 /* load custom intra matrix */ 1668 if(get_bits1(gb)){ 1669 int last=0; 1670 for(i=0; i<64; i++){ 1671 int j; 1672 v= get_bits(gb, 8); 1673 if(v==0) break; 1674 1675 last= v; 1676 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 1677 s->intra_matrix[j]= v; 1678 s->chroma_intra_matrix[j]= v; 1679 } 1680 1681 /* replicate last value */ 1682 for(; i<64; i++){ 1683 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 1684 s->intra_matrix[j]= last; 1685 s->chroma_intra_matrix[j]= last; 1686 } 1687 } 1688 1689 /* load custom non intra matrix */ 1690 if(get_bits1(gb)){ 1691 int last=0; 1692 for(i=0; i<64; i++){ 1693 int j; 1694 v= get_bits(gb, 8); 1695 if(v==0) break; 1696 1697 last= v; 1698 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 1699 s->inter_matrix[j]= v; 1700 s->chroma_inter_matrix[j]= v; 1701 } 1702 1703 /* replicate last value */ 1704 for(; i<64; i++){ 1705 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 1706 s->inter_matrix[j]= last; 1707 s->chroma_inter_matrix[j]= last; 1708 } 1709 } 1710 1711 // FIXME a bunch of grayscale shape things 1712 } 1713 1714 if(vo_ver_id != 1) 1715 s->quarter_sample= get_bits1(gb); 1716 else s->quarter_sample=0; 1717 1718 if(!get_bits1(gb)){ 1719 int pos= get_bits_count(gb); 1720 int estimation_method= get_bits(gb, 2); 1721 if(estimation_method<2){ 1722 if(!get_bits1(gb)){ 1723 s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque 1724 s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent 1725 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae 1726 s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae 1727 s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update 1728 s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling 1729 } 1730 if(!get_bits1(gb)){ 1731 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks 1732 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks 1733 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks 1734 s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks 1735 } 1736 if(!check_marker(gb, "in complexity estimation part 1")){ 1737 skip_bits_long(gb, pos - get_bits_count(gb)); 1738 goto no_cplx_est; 1739 } 1740 if(!get_bits1(gb)){ 1741 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs 1742 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines 1743 s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms 1744 s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits 1745 } 1746 if(!get_bits1(gb)){ 1747 s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm 1748 s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm 1749 s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q 1750 s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q 1751 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2 1752 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4 1753 } 1754 if(!check_marker(gb, "in complexity estimation part 2")){ 1755 skip_bits_long(gb, pos - get_bits_count(gb)); 1756 goto no_cplx_est; 1757 } 1758 if(estimation_method==1){ 1759 s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct 1760 s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel 1761 } 1762 }else 1763 av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method); 1764 }else{ 1765no_cplx_est: 1766 s->cplx_estimation_trash_i= 1767 s->cplx_estimation_trash_p= 1768 s->cplx_estimation_trash_b= 0; 1769 } 1770 1771 s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */ 1772 1773 s->data_partitioning= get_bits1(gb); 1774 if(s->data_partitioning){ 1775 s->rvlc= get_bits1(gb); 1776 } 1777 1778 if(vo_ver_id != 1) { 1779 s->new_pred= get_bits1(gb); 1780 if(s->new_pred){ 1781 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n"); 1782 skip_bits(gb, 2); /* requested upstream message type */ 1783 skip_bits1(gb); /* newpred segment type */ 1784 } 1785 s->reduced_res_vop= get_bits1(gb); 1786 if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n"); 1787 } 1788 else{ 1789 s->new_pred=0; 1790 s->reduced_res_vop= 0; 1791 } 1792 1793 s->scalability= get_bits1(gb); 1794 1795 if (s->scalability) { 1796 GetBitContext bak= *gb; 1797 int ref_layer_id; 1798 int ref_layer_sampling_dir; 1799 int h_sampling_factor_n; 1800 int h_sampling_factor_m; 1801 int v_sampling_factor_n; 1802 int v_sampling_factor_m; 1803 1804 s->hierachy_type= get_bits1(gb); 1805 ref_layer_id= get_bits(gb, 4); 1806 ref_layer_sampling_dir= get_bits1(gb); 1807 h_sampling_factor_n= get_bits(gb, 5); 1808 h_sampling_factor_m= get_bits(gb, 5); 1809 v_sampling_factor_n= get_bits(gb, 5); 1810 v_sampling_factor_m= get_bits(gb, 5); 1811 s->enhancement_type= get_bits1(gb); 1812 1813 if( h_sampling_factor_n==0 || h_sampling_factor_m==0 1814 || v_sampling_factor_n==0 || v_sampling_factor_m==0){ 1815 /* illegal scalability header (VERY broken encoder), 1816 * trying to workaround */ 1817 s->scalability=0; 1818 *gb= bak; 1819 }else 1820 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n"); 1821 1822 // bin shape stuff FIXME 1823 } 1824 } 1825 return 0; 1826} 1827 1828/** 1829 * decodes the user data stuff in the header. 1830 * Also initializes divx/xvid/lavc_version/build. 1831 */ 1832static int decode_user_data(MpegEncContext *s, GetBitContext *gb){ 1833 char buf[256]; 1834 int i; 1835 int e; 1836 int ver = 0, build = 0, ver2 = 0, ver3 = 0; 1837 char last; 1838 1839 for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){ 1840 if(show_bits(gb, 23) == 0) break; 1841 buf[i]= get_bits(gb, 8); 1842 } 1843 buf[i]=0; 1844 1845 /* divx detection */ 1846 e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last); 1847 if(e<2) 1848 e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last); 1849 if(e>=2){ 1850 s->divx_version= ver; 1851 s->divx_build= build; 1852 s->divx_packed= e==3 && last=='p'; 1853 if(s->divx_packed && !s->showed_packed_warning) { 1854 av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n"); 1855 s->showed_packed_warning=1; 1856 } 1857 } 1858 1859 /* ffmpeg detection */ 1860 e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3; 1861 if(e!=4) 1862 e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build); 1863 if(e!=4){ 1864 e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1; 1865 if (e>1) 1866 build= (ver<<16) + (ver2<<8) + ver3; 1867 } 1868 if(e!=4){ 1869 if(strcmp(buf, "ffmpeg")==0){ 1870 s->lavc_build= 4600; 1871 } 1872 } 1873 if(e==4){ 1874 s->lavc_build= build; 1875 } 1876 1877 /* Xvid detection */ 1878 e=sscanf(buf, "XviD%d", &build); 1879 if(e==1){ 1880 s->xvid_build= build; 1881 } 1882 1883 return 0; 1884} 1885 1886static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){ 1887 int time_incr, time_increment; 1888 1889 s->pict_type = get_bits(gb, 2) + FF_I_TYPE; /* pict type: I = 0 , P = 1 */ 1890 if(s->pict_type==FF_B_TYPE && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){ 1891 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n"); 1892 s->low_delay=0; 1893 } 1894 1895 s->partitioned_frame= s->data_partitioning && s->pict_type!=FF_B_TYPE; 1896 if(s->partitioned_frame) 1897 s->decode_mb= mpeg4_decode_partitioned_mb; 1898 else 1899 s->decode_mb= mpeg4_decode_mb; 1900 1901 time_incr=0; 1902 while (get_bits1(gb) != 0) 1903 time_incr++; 1904 1905 check_marker(gb, "before time_increment"); 1906 1907 if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){ 1908 av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n"); 1909 1910 for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){ 1911 if ( s->pict_type == FF_P_TYPE 1912 || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) { 1913 if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break; 1914 }else 1915 if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break; 1916 } 1917 1918 av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits); 1919 } 1920 1921 if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further 1922 else time_increment= get_bits(gb, s->time_increment_bits); 1923 1924 if(s->pict_type!=FF_B_TYPE){ 1925 s->last_time_base= s->time_base; 1926 s->time_base+= time_incr; 1927 s->time= s->time_base*s->avctx->time_base.den + time_increment; 1928 if(s->workaround_bugs&FF_BUG_UMP4){ 1929 if(s->time < s->last_non_b_time){ 1930 /* header is not mpeg-4-compatible, broken encoder, 1931 * trying to workaround */ 1932 s->time_base++; 1933 s->time+= s->avctx->time_base.den; 1934 } 1935 } 1936 s->pp_time= s->time - s->last_non_b_time; 1937 s->last_non_b_time= s->time; 1938 }else{ 1939 s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment; 1940 s->pb_time= s->pp_time - (s->last_non_b_time - s->time); 1941 if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){ 1942 /* messed up order, maybe after seeking? skipping current b-frame */ 1943 return FRAME_SKIPPED; 1944 } 1945 ff_mpeg4_init_direct_mv(s); 1946 1947 if(s->t_frame==0) s->t_frame= s->pb_time; 1948 if(s->t_frame==0) s->t_frame=1; // 1/0 protection 1949 s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame) 1950 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2; 1951 s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame) 1952 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2; 1953 if(!s->progressive_sequence){ 1954 if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) 1955 return FRAME_SKIPPED; 1956 } 1957 } 1958 1959 if(s->avctx->time_base.num) 1960 s->current_picture_ptr->pts= (s->time + s->avctx->time_base.num/2) / s->avctx->time_base.num; 1961 else 1962 s->current_picture_ptr->pts= AV_NOPTS_VALUE; 1963 if(s->avctx->debug&FF_DEBUG_PTS) 1964 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n", s->current_picture_ptr->pts); 1965 1966 check_marker(gb, "before vop_coded"); 1967 1968 /* vop coded */ 1969 if (get_bits1(gb) != 1){ 1970 if(s->avctx->debug&FF_DEBUG_PICT_INFO) 1971 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n"); 1972 return FRAME_SKIPPED; 1973 } 1974 if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == FF_P_TYPE 1975 || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE))) { 1976 /* rounding type for motion estimation */ 1977 s->no_rounding = get_bits1(gb); 1978 } else { 1979 s->no_rounding = 0; 1980 } 1981//FIXME reduced res stuff 1982 1983 if (s->shape != RECT_SHAPE) { 1984 if (s->vol_sprite_usage != 1 || s->pict_type != FF_I_TYPE) { 1985 int width, height, hor_spat_ref, ver_spat_ref; 1986 1987 width = get_bits(gb, 13); 1988 skip_bits1(gb); /* marker */ 1989 height = get_bits(gb, 13); 1990 skip_bits1(gb); /* marker */ 1991 hor_spat_ref = get_bits(gb, 13); /* hor_spat_ref */ 1992 skip_bits1(gb); /* marker */ 1993 ver_spat_ref = get_bits(gb, 13); /* ver_spat_ref */ 1994 } 1995 skip_bits1(gb); /* change_CR_disable */ 1996 1997 if (get_bits1(gb) != 0) { 1998 skip_bits(gb, 8); /* constant_alpha_value */ 1999 } 2000 } 2001//FIXME complexity estimation stuff 2002 2003 if (s->shape != BIN_ONLY_SHAPE) { 2004 skip_bits_long(gb, s->cplx_estimation_trash_i); 2005 if(s->pict_type != FF_I_TYPE) 2006 skip_bits_long(gb, s->cplx_estimation_trash_p); 2007 if(s->pict_type == FF_B_TYPE) 2008 skip_bits_long(gb, s->cplx_estimation_trash_b); 2009 2010 s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ]; 2011 if(!s->progressive_sequence){ 2012 s->top_field_first= get_bits1(gb); 2013 s->alternate_scan= get_bits1(gb); 2014 }else 2015 s->alternate_scan= 0; 2016 } 2017 2018 if(s->alternate_scan){ 2019 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan); 2020 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan); 2021 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan); 2022 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan); 2023 } else{ 2024 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct); 2025 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct); 2026 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan); 2027 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan); 2028 } 2029 2030 if(s->pict_type == FF_S_TYPE && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){ 2031 mpeg4_decode_sprite_trajectory(s, gb); 2032 if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n"); 2033 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n"); 2034 } 2035 2036 if (s->shape != BIN_ONLY_SHAPE) { 2037 s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision); 2038 if(s->qscale==0){ 2039 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n"); 2040 return -1; // makes no sense to continue, as there is nothing left from the image then 2041 } 2042 2043 if (s->pict_type != FF_I_TYPE) { 2044 s->f_code = get_bits(gb, 3); /* fcode_for */ 2045 if(s->f_code==0){ 2046 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n"); 2047 return -1; // makes no sense to continue, as the MV decoding will break very quickly 2048 } 2049 }else 2050 s->f_code=1; 2051 2052 if (s->pict_type == FF_B_TYPE) { 2053 s->b_code = get_bits(gb, 3); 2054 }else 2055 s->b_code=1; 2056 2057 if(s->avctx->debug&FF_DEBUG_PICT_INFO){ 2058 av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n", 2059 s->qscale, s->f_code, s->b_code, 2060 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")), 2061 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first, 2062 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points, 2063 s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold, s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b); 2064 } 2065 2066 if(!s->scalability){ 2067 if (s->shape!=RECT_SHAPE && s->pict_type!=FF_I_TYPE) { 2068 skip_bits1(gb); // vop shape coding type 2069 } 2070 }else{ 2071 if(s->enhancement_type){ 2072 int load_backward_shape= get_bits1(gb); 2073 if(load_backward_shape){ 2074 av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n"); 2075 } 2076 } 2077 skip_bits(gb, 2); //ref_select_code 2078 } 2079 } 2080 /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/ 2081 // note we cannot detect divx5 without b-frames easily (although it's buggy too) 2082 if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){ 2083 av_log(s->avctx, AV_LOG_ERROR, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n"); 2084 s->low_delay=1; 2085 } 2086 2087 s->picture_number++; // better than pic number==0 always ;) 2088 2089 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support 2090 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table; 2091 2092 if(s->workaround_bugs&FF_BUG_EDGE){ 2093 s->h_edge_pos= s->width; 2094 s->v_edge_pos= s->height; 2095 } 2096 return 0; 2097} 2098 2099/** 2100 * decode mpeg4 headers 2101 * @return <0 if no VOP found (or a damaged one) 2102 * FRAME_SKIPPED if a not coded VOP is found 2103 * 0 if a VOP is found 2104 */ 2105int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb) 2106{ 2107 int startcode, v; 2108 2109 /* search next start code */ 2110 align_get_bits(gb); 2111 2112 if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){ 2113 skip_bits(gb, 24); 2114 if(get_bits(gb, 8) == 0xF0) 2115 goto end; 2116 } 2117 2118 startcode = 0xff; 2119 for(;;) { 2120 if(get_bits_count(gb) >= gb->size_in_bits){ 2121 if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){ 2122 av_log(s->avctx, AV_LOG_ERROR, "frame skip %d\n", gb->size_in_bits); 2123 return FRAME_SKIPPED; //divx bug 2124 }else 2125 return -1; //end of stream 2126 } 2127 2128 /* use the bits after the test */ 2129 v = get_bits(gb, 8); 2130 startcode = ((startcode << 8) | v) & 0xffffffff; 2131 2132 if((startcode&0xFFFFFF00) != 0x100) 2133 continue; //no startcode 2134 2135 if(s->avctx->debug&FF_DEBUG_STARTCODE){ 2136 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode); 2137 if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start"); 2138 else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start"); 2139 else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved"); 2140 else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start"); 2141 else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved"); 2142 else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start"); 2143 else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End"); 2144 else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data"); 2145 else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start"); 2146 else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error"); 2147 else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start"); 2148 else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start"); 2149 else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start"); 2150 else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start"); 2151 else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start"); 2152 else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start"); 2153 else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start"); 2154 else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start"); 2155 else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start"); 2156 else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start"); 2157 else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start"); 2158 else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start"); 2159 else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start"); 2160 else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start"); 2161 else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start"); 2162 else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved"); 2163 else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start"); 2164 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb)); 2165 } 2166 2167 if(startcode >= 0x120 && startcode <= 0x12F){ 2168 if(decode_vol_header(s, gb) < 0) 2169 return -1; 2170 } 2171 else if(startcode == USER_DATA_STARTCODE){ 2172 decode_user_data(s, gb); 2173 } 2174 else if(startcode == GOP_STARTCODE){ 2175 mpeg4_decode_gop_header(s, gb); 2176 } 2177 else if(startcode == VOP_STARTCODE){ 2178 break; 2179 } 2180 2181 align_get_bits(gb); 2182 startcode = 0xff; 2183 } 2184end: 2185 if(s->flags& CODEC_FLAG_LOW_DELAY) 2186 s->low_delay=1; 2187 s->avctx->has_b_frames= !s->low_delay; 2188 return decode_vop_header(s, gb); 2189} 2190 2191static av_cold int decode_init(AVCodecContext *avctx) 2192{ 2193 MpegEncContext *s = avctx->priv_data; 2194 int ret; 2195 static int done = 0; 2196 2197 s->divx_version= 2198 s->divx_build= 2199 s->xvid_build= 2200 s->lavc_build= -1; 2201 2202 if((ret=ff_h263_decode_init(avctx)) < 0) 2203 return ret; 2204 2205 if (!done) { 2206 done = 1; 2207 2208 init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]); 2209 init_rl(&rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]); 2210 init_rl(&rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]); 2211 INIT_VLC_RL(ff_mpeg4_rl_intra, 554); 2212 INIT_VLC_RL(rvlc_rl_inter, 1072); 2213 INIT_VLC_RL(rvlc_rl_intra, 1072); 2214 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */, 2215 &ff_mpeg4_DCtab_lum[0][1], 2, 1, 2216 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512); 2217 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */, 2218 &ff_mpeg4_DCtab_chrom[0][1], 2, 1, 2219 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512); 2220 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15, 2221 &sprite_trajectory_tab[0][1], 4, 2, 2222 &sprite_trajectory_tab[0][0], 4, 2, 128); 2223 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4, 2224 &mb_type_b_tab[0][1], 2, 1, 2225 &mb_type_b_tab[0][0], 2, 1, 16); 2226 } 2227 2228 s->h263_pred = 1; 2229 s->low_delay = 0; //default, might be overriden in the vol header during header parsing 2230 s->decode_mb= mpeg4_decode_mb; 2231 s->time_increment_bits = 4; /* default value for broken headers */ 2232 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; 2233 2234 return 0; 2235} 2236 2237AVCodec mpeg4_decoder = { 2238 "mpeg4", 2239 AVMEDIA_TYPE_VIDEO, 2240 CODEC_ID_MPEG4, 2241 sizeof(MpegEncContext), 2242 decode_init, 2243 NULL, 2244 ff_h263_decode_end, 2245 ff_h263_decode_frame, 2246 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, 2247 .flush= ff_mpeg_flush, 2248 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"), 2249 .pix_fmts= ff_hwaccel_pixfmt_list_420, 2250}; 2251 2252 2253#if CONFIG_MPEG4_VDPAU_DECODER 2254AVCodec mpeg4_vdpau_decoder = { 2255 "mpeg4_vdpau", 2256 AVMEDIA_TYPE_VIDEO, 2257 CODEC_ID_MPEG4, 2258 sizeof(MpegEncContext), 2259 decode_init, 2260 NULL, 2261 ff_h263_decode_end, 2262 ff_h263_decode_frame, 2263 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU, 2264 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"), 2265 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE}, 2266}; 2267#endif 2268