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#define UNCHECKED_BITSTREAM_READER 1 24 25#include "libavutil/opt.h" 26#include "error_resilience.h" 27#include "idctdsp.h" 28#include "internal.h" 29#include "mpegutils.h" 30#include "mpegvideo.h" 31#include "mpeg4video.h" 32#include "h263.h" 33#include "thread.h" 34 35/* The defines below define the number of bits that are read at once for 36 * reading vlc values. Changing these may improve speed and data cache needs 37 * be aware though that decreasing them may need the number of stages that is 38 * passed to get_vlc* to be increased. */ 39#define SPRITE_TRAJ_VLC_BITS 6 40#define DC_VLC_BITS 9 41#define MB_TYPE_B_VLC_BITS 4 42 43static VLC dc_lum, dc_chrom; 44static VLC sprite_trajectory; 45static VLC mb_type_b_vlc; 46 47static const int mb_type_b_map[4] = { 48 MB_TYPE_DIRECT2 | MB_TYPE_L0L1, 49 MB_TYPE_L0L1 | MB_TYPE_16x16, 50 MB_TYPE_L1 | MB_TYPE_16x16, 51 MB_TYPE_L0 | MB_TYPE_16x16, 52}; 53 54/** 55 * Predict the ac. 56 * @param n block index (0-3 are luma, 4-5 are chroma) 57 * @param dir the ac prediction direction 58 */ 59void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir) 60{ 61 int i; 62 int16_t *ac_val, *ac_val1; 63 int8_t *const qscale_table = s->current_picture.qscale_table; 64 65 /* find prediction */ 66 ac_val = s->ac_val[0][0] + s->block_index[n] * 16; 67 ac_val1 = ac_val; 68 if (s->ac_pred) { 69 if (dir == 0) { 70 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride; 71 /* left prediction */ 72 ac_val -= 16; 73 74 if (s->mb_x == 0 || s->qscale == qscale_table[xy] || 75 n == 1 || n == 3) { 76 /* same qscale */ 77 for (i = 1; i < 8; i++) 78 block[s->idsp.idct_permutation[i << 3]] += ac_val[i]; 79 } else { 80 /* different qscale, we must rescale */ 81 for (i = 1; i < 8; i++) 82 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale); 83 } 84 } else { 85 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride; 86 /* top prediction */ 87 ac_val -= 16 * s->block_wrap[n]; 88 89 if (s->mb_y == 0 || s->qscale == qscale_table[xy] || 90 n == 2 || n == 3) { 91 /* same qscale */ 92 for (i = 1; i < 8; i++) 93 block[s->idsp.idct_permutation[i]] += ac_val[i + 8]; 94 } else { 95 /* different qscale, we must rescale */ 96 for (i = 1; i < 8; i++) 97 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale); 98 } 99 } 100 } 101 /* left copy */ 102 for (i = 1; i < 8; i++) 103 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]]; 104 105 /* top copy */ 106 for (i = 1; i < 8; i++) 107 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]]; 108} 109 110/** 111 * check if the next stuff is a resync marker or the end. 112 * @return 0 if not 113 */ 114static inline int mpeg4_is_resync(Mpeg4DecContext *ctx) 115{ 116 MpegEncContext *s = &ctx->m; 117 int bits_count = get_bits_count(&s->gb); 118 int v = show_bits(&s->gb, 16); 119 120 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker) 121 return 0; 122 123 while (v <= 0xFF) { 124 if (s->pict_type == AV_PICTURE_TYPE_B || 125 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame) 126 break; 127 skip_bits(&s->gb, 8 + s->pict_type); 128 bits_count += 8 + s->pict_type; 129 v = show_bits(&s->gb, 16); 130 } 131 132 if (bits_count + 8 >= s->gb.size_in_bits) { 133 v >>= 8; 134 v |= 0x7F >> (7 - (bits_count & 7)); 135 136 if (v == 0x7F) 137 return s->mb_num; 138 } else { 139 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) { 140 int len, mb_num; 141 int mb_num_bits = av_log2(s->mb_num - 1) + 1; 142 GetBitContext gb = s->gb; 143 144 skip_bits(&s->gb, 1); 145 align_get_bits(&s->gb); 146 147 for (len = 0; len < 32; len++) 148 if (get_bits1(&s->gb)) 149 break; 150 151 mb_num = get_bits(&s->gb, mb_num_bits); 152 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits) 153 mb_num= -1; 154 155 s->gb = gb; 156 157 if (len >= ff_mpeg4_get_video_packet_prefix_length(s)) 158 return mb_num; 159 } 160 } 161 return 0; 162} 163 164static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb) 165{ 166 MpegEncContext *s = &ctx->m; 167 int a = 2 << s->sprite_warping_accuracy; 168 int rho = 3 - s->sprite_warping_accuracy; 169 int r = 16 / a; 170 int alpha = 0; 171 int beta = 0; 172 int w = s->width; 173 int h = s->height; 174 int min_ab, i, w2, h2, w3, h3; 175 int sprite_ref[4][2]; 176 int virtual_ref[2][2]; 177 178 // only true for rectangle shapes 179 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 }, 180 { 0, s->height }, { s->width, s->height } }; 181 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } }; 182 183 if (w <= 0 || h <= 0) 184 return AVERROR_INVALIDDATA; 185 186 for (i = 0; i < ctx->num_sprite_warping_points; i++) { 187 int length; 188 int x = 0, y = 0; 189 190 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); 191 if (length) 192 x = get_xbits(gb, length); 193 194 if (!(ctx->divx_version == 500 && ctx->divx_build == 413)) 195 skip_bits1(gb); /* marker bit */ 196 197 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); 198 if (length) 199 y = get_xbits(gb, length); 200 201 skip_bits1(gb); /* marker bit */ 202 ctx->sprite_traj[i][0] = d[i][0] = x; 203 ctx->sprite_traj[i][1] = d[i][1] = y; 204 } 205 for (; i < 4; i++) 206 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0; 207 208 while ((1 << alpha) < w) 209 alpha++; 210 while ((1 << beta) < h) 211 beta++; /* typo in the mpeg4 std for the definition of w' and h' */ 212 w2 = 1 << alpha; 213 h2 = 1 << beta; 214 215 // Note, the 4th point isn't used for GMC 216 if (ctx->divx_version == 500 && ctx->divx_build == 413) { 217 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0]; 218 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1]; 219 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0]; 220 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1]; 221 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0]; 222 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1]; 223 } else { 224 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]); 225 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]); 226 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]); 227 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]); 228 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]); 229 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]); 230 } 231 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]); 232 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */ 233 234 /* this is mostly identical to the mpeg4 std (and is totally unreadable 235 * because of that...). Perhaps it should be reordered to be more readable. 236 * The idea behind this virtual_ref mess is to be able to use shifts later 237 * per pixel instead of divides so the distance between points is converted 238 * from w&h based to w2&h2 based which are of the 2^x form. */ 239 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) + 240 ROUNDED_DIV(((w - w2) * 241 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) + 242 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w); 243 virtual_ref[0][1] = 16 * vop_ref[0][1] + 244 ROUNDED_DIV(((w - w2) * 245 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) + 246 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w); 247 virtual_ref[1][0] = 16 * vop_ref[0][0] + 248 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) + 249 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h); 250 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) + 251 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) + 252 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h); 253 254 switch (ctx->num_sprite_warping_points) { 255 case 0: 256 s->sprite_offset[0][0] = 257 s->sprite_offset[0][1] = 258 s->sprite_offset[1][0] = 259 s->sprite_offset[1][1] = 0; 260 s->sprite_delta[0][0] = a; 261 s->sprite_delta[0][1] = 262 s->sprite_delta[1][0] = 0; 263 s->sprite_delta[1][1] = a; 264 ctx->sprite_shift[0] = 265 ctx->sprite_shift[1] = 0; 266 break; 267 case 1: // GMC only 268 s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0]; 269 s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1]; 270 s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) - 271 a * (vop_ref[0][0] / 2); 272 s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) - 273 a * (vop_ref[0][1] / 2); 274 s->sprite_delta[0][0] = a; 275 s->sprite_delta[0][1] = 276 s->sprite_delta[1][0] = 0; 277 s->sprite_delta[1][1] = a; 278 ctx->sprite_shift[0] = 279 ctx->sprite_shift[1] = 0; 280 break; 281 case 2: 282 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) + 283 (-r * sprite_ref[0][0] + virtual_ref[0][0]) * 284 (-vop_ref[0][0]) + 285 (r * sprite_ref[0][1] - virtual_ref[0][1]) * 286 (-vop_ref[0][1]) + (1 << (alpha + rho - 1)); 287 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) + 288 (-r * sprite_ref[0][1] + virtual_ref[0][1]) * 289 (-vop_ref[0][0]) + 290 (-r * sprite_ref[0][0] + virtual_ref[0][0]) * 291 (-vop_ref[0][1]) + (1 << (alpha + rho - 1)); 292 s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) * 293 (-2 * vop_ref[0][0] + 1) + 294 (r * sprite_ref[0][1] - virtual_ref[0][1]) * 295 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r * 296 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1))); 297 s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) * 298 (-2 * vop_ref[0][0] + 1) + 299 (-r * sprite_ref[0][0] + virtual_ref[0][0]) * 300 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r * 301 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1))); 302 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]); 303 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]); 304 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]); 305 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]); 306 307 ctx->sprite_shift[0] = alpha + rho; 308 ctx->sprite_shift[1] = alpha + rho + 2; 309 break; 310 case 3: 311 min_ab = FFMIN(alpha, beta); 312 w3 = w2 >> min_ab; 313 h3 = h2 >> min_ab; 314 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) + 315 (-r * sprite_ref[0][0] + virtual_ref[0][0]) * 316 h3 * (-vop_ref[0][0]) + 317 (-r * sprite_ref[0][0] + virtual_ref[1][0]) * 318 w3 * (-vop_ref[0][1]) + 319 (1 << (alpha + beta + rho - min_ab - 1)); 320 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) + 321 (-r * sprite_ref[0][1] + virtual_ref[0][1]) * 322 h3 * (-vop_ref[0][0]) + 323 (-r * sprite_ref[0][1] + virtual_ref[1][1]) * 324 w3 * (-vop_ref[0][1]) + 325 (1 << (alpha + beta + rho - min_ab - 1)); 326 s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * 327 h3 * (-2 * vop_ref[0][0] + 1) + 328 (-r * sprite_ref[0][0] + virtual_ref[1][0]) * 329 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 * 330 r * sprite_ref[0][0] - 16 * w2 * h3 + 331 (1 << (alpha + beta + rho - min_ab + 1)); 332 s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * 333 h3 * (-2 * vop_ref[0][0] + 1) + 334 (-r * sprite_ref[0][1] + virtual_ref[1][1]) * 335 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 * 336 r * sprite_ref[0][1] - 16 * w2 * h3 + 337 (1 << (alpha + beta + rho - min_ab + 1)); 338 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3; 339 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3; 340 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3; 341 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3; 342 343 ctx->sprite_shift[0] = alpha + beta + rho - min_ab; 344 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2; 345 break; 346 } 347 /* try to simplify the situation */ 348 if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] && 349 s->sprite_delta[0][1] == 0 && 350 s->sprite_delta[1][0] == 0 && 351 s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) { 352 s->sprite_offset[0][0] >>= ctx->sprite_shift[0]; 353 s->sprite_offset[0][1] >>= ctx->sprite_shift[0]; 354 s->sprite_offset[1][0] >>= ctx->sprite_shift[1]; 355 s->sprite_offset[1][1] >>= ctx->sprite_shift[1]; 356 s->sprite_delta[0][0] = a; 357 s->sprite_delta[0][1] = 0; 358 s->sprite_delta[1][0] = 0; 359 s->sprite_delta[1][1] = a; 360 ctx->sprite_shift[0] = 0; 361 ctx->sprite_shift[1] = 0; 362 s->real_sprite_warping_points = 1; 363 } else { 364 int shift_y = 16 - ctx->sprite_shift[0]; 365 int shift_c = 16 - ctx->sprite_shift[1]; 366 for (i = 0; i < 2; i++) { 367 s->sprite_offset[0][i] <<= shift_y; 368 s->sprite_offset[1][i] <<= shift_c; 369 s->sprite_delta[0][i] <<= shift_y; 370 s->sprite_delta[1][i] <<= shift_y; 371 ctx->sprite_shift[i] = 16; 372 } 373 s->real_sprite_warping_points = ctx->num_sprite_warping_points; 374 } 375 376 return 0; 377} 378 379static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) { 380 int len = FFMIN(ctx->time_increment_bits + 3, 15); 381 382 get_bits(gb, len); 383 if (get_bits1(gb)) 384 get_bits(gb, len); 385 check_marker(gb, "after new_pred"); 386 387 return 0; 388} 389 390/** 391 * Decode the next video packet. 392 * @return <0 if something went wrong 393 */ 394int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx) 395{ 396 MpegEncContext *s = &ctx->m; 397 398 int mb_num_bits = av_log2(s->mb_num - 1) + 1; 399 int header_extension = 0, mb_num, len; 400 401 /* is there enough space left for a video packet + header */ 402 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20) 403 return -1; 404 405 for (len = 0; len < 32; len++) 406 if (get_bits1(&s->gb)) 407 break; 408 409 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) { 410 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n"); 411 return -1; 412 } 413 414 if (ctx->shape != RECT_SHAPE) { 415 header_extension = get_bits1(&s->gb); 416 // FIXME more stuff here 417 } 418 419 mb_num = get_bits(&s->gb, mb_num_bits); 420 if (mb_num >= s->mb_num) { 421 av_log(s->avctx, AV_LOG_ERROR, 422 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num); 423 return -1; 424 } 425 426 s->mb_x = mb_num % s->mb_width; 427 s->mb_y = mb_num / s->mb_width; 428 429 if (ctx->shape != BIN_ONLY_SHAPE) { 430 int qscale = get_bits(&s->gb, s->quant_precision); 431 if (qscale) 432 s->chroma_qscale = s->qscale = qscale; 433 } 434 435 if (ctx->shape == RECT_SHAPE) 436 header_extension = get_bits1(&s->gb); 437 438 if (header_extension) { 439 int time_incr = 0; 440 441 while (get_bits1(&s->gb) != 0) 442 time_incr++; 443 444 check_marker(&s->gb, "before time_increment in video packed header"); 445 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */ 446 check_marker(&s->gb, "before vop_coding_type in video packed header"); 447 448 skip_bits(&s->gb, 2); /* vop coding type */ 449 // FIXME not rect stuff here 450 451 if (ctx->shape != BIN_ONLY_SHAPE) { 452 skip_bits(&s->gb, 3); /* intra dc vlc threshold */ 453 // FIXME don't just ignore everything 454 if (s->pict_type == AV_PICTURE_TYPE_S && 455 ctx->vol_sprite_usage == GMC_SPRITE) { 456 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0) 457 return AVERROR_INVALIDDATA; 458 av_log(s->avctx, AV_LOG_ERROR, "untested\n"); 459 } 460 461 // FIXME reduced res stuff here 462 463 if (s->pict_type != AV_PICTURE_TYPE_I) { 464 int f_code = get_bits(&s->gb, 3); /* fcode_for */ 465 if (f_code == 0) 466 av_log(s->avctx, AV_LOG_ERROR, 467 "Error, video packet header damaged (f_code=0)\n"); 468 } 469 if (s->pict_type == AV_PICTURE_TYPE_B) { 470 int b_code = get_bits(&s->gb, 3); 471 if (b_code == 0) 472 av_log(s->avctx, AV_LOG_ERROR, 473 "Error, video packet header damaged (b_code=0)\n"); 474 } 475 } 476 } 477 if (ctx->new_pred) 478 decode_new_pred(ctx, &s->gb); 479 480 return 0; 481} 482 483/** 484 * Get the average motion vector for a GMC MB. 485 * @param n either 0 for the x component or 1 for y 486 * @return the average MV for a GMC MB 487 */ 488static inline int get_amv(Mpeg4DecContext *ctx, int n) 489{ 490 MpegEncContext *s = &ctx->m; 491 int x, y, mb_v, sum, dx, dy, shift; 492 int len = 1 << (s->f_code + 4); 493 const int a = s->sprite_warping_accuracy; 494 495 if (s->workaround_bugs & FF_BUG_AMV) 496 len >>= s->quarter_sample; 497 498 if (s->real_sprite_warping_points == 1) { 499 if (ctx->divx_version == 500 && ctx->divx_build == 413) 500 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample)); 501 else 502 sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a); 503 } else { 504 dx = s->sprite_delta[n][0]; 505 dy = s->sprite_delta[n][1]; 506 shift = ctx->sprite_shift[0]; 507 if (n) 508 dy -= 1 << (shift + a + 1); 509 else 510 dx -= 1 << (shift + a + 1); 511 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16; 512 513 sum = 0; 514 for (y = 0; y < 16; y++) { 515 int v; 516 517 v = mb_v + dy * y; 518 // FIXME optimize 519 for (x = 0; x < 16; x++) { 520 sum += v >> shift; 521 v += dx; 522 } 523 } 524 sum = RSHIFT(sum, a + 8 - s->quarter_sample); 525 } 526 527 if (sum < -len) 528 sum = -len; 529 else if (sum >= len) 530 sum = len - 1; 531 532 return sum; 533} 534 535/** 536 * Decode the dc value. 537 * @param n block index (0-3 are luma, 4-5 are chroma) 538 * @param dir_ptr the prediction direction will be stored here 539 * @return the quantized dc 540 */ 541static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr) 542{ 543 int level, code; 544 545 if (n < 4) 546 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1); 547 else 548 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1); 549 550 if (code < 0 || code > 9 /* && s->nbit < 9 */) { 551 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n"); 552 return -1; 553 } 554 555 if (code == 0) { 556 level = 0; 557 } else { 558 if (IS_3IV1) { 559 if (code == 1) 560 level = 2 * get_bits1(&s->gb) - 1; 561 else { 562 if (get_bits1(&s->gb)) 563 level = get_bits(&s->gb, code - 1) + (1 << (code - 1)); 564 else 565 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1)); 566 } 567 } else { 568 level = get_xbits(&s->gb, code); 569 } 570 571 if (code > 8) { 572 if (get_bits1(&s->gb) == 0) { /* marker */ 573 if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) { 574 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n"); 575 return -1; 576 } 577 } 578 } 579 } 580 581 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0); 582} 583 584/** 585 * Decode first partition. 586 * @return number of MBs decoded or <0 if an error occurred 587 */ 588static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx) 589{ 590 MpegEncContext *s = &ctx->m; 591 int mb_num = 0; 592 static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; 593 594 /* decode first partition */ 595 s->first_slice_line = 1; 596 for (; s->mb_y < s->mb_height; s->mb_y++) { 597 ff_init_block_index(s); 598 for (; s->mb_x < s->mb_width; s->mb_x++) { 599 const int xy = s->mb_x + s->mb_y * s->mb_stride; 600 int cbpc; 601 int dir = 0; 602 603 mb_num++; 604 ff_update_block_index(s); 605 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) 606 s->first_slice_line = 0; 607 608 if (s->pict_type == AV_PICTURE_TYPE_I) { 609 int i; 610 611 do { 612 if (show_bits_long(&s->gb, 19) == DC_MARKER) 613 return mb_num - 1; 614 615 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); 616 if (cbpc < 0) { 617 av_log(s->avctx, AV_LOG_ERROR, 618 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y); 619 return -1; 620 } 621 } while (cbpc == 8); 622 623 s->cbp_table[xy] = cbpc & 3; 624 s->current_picture.mb_type[xy] = MB_TYPE_INTRA; 625 s->mb_intra = 1; 626 627 if (cbpc & 4) 628 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 629 630 s->current_picture.qscale_table[xy] = s->qscale; 631 632 s->mbintra_table[xy] = 1; 633 for (i = 0; i < 6; i++) { 634 int dc_pred_dir; 635 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir); 636 if (dc < 0) { 637 av_log(s->avctx, AV_LOG_ERROR, 638 "DC corrupted at %d %d\n", s->mb_x, s->mb_y); 639 return -1; 640 } 641 dir <<= 1; 642 if (dc_pred_dir) 643 dir |= 1; 644 } 645 s->pred_dir_table[xy] = dir; 646 } else { /* P/S_TYPE */ 647 int mx, my, pred_x, pred_y, bits; 648 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]]; 649 const int stride = s->b8_stride * 2; 650 651try_again: 652 bits = show_bits(&s->gb, 17); 653 if (bits == MOTION_MARKER) 654 return mb_num - 1; 655 656 skip_bits1(&s->gb); 657 if (bits & 0x10000) { 658 /* skip mb */ 659 if (s->pict_type == AV_PICTURE_TYPE_S && 660 ctx->vol_sprite_usage == GMC_SPRITE) { 661 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | 662 MB_TYPE_16x16 | 663 MB_TYPE_GMC | 664 MB_TYPE_L0; 665 mx = get_amv(ctx, 0); 666 my = get_amv(ctx, 1); 667 } else { 668 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | 669 MB_TYPE_16x16 | 670 MB_TYPE_L0; 671 mx = my = 0; 672 } 673 mot_val[0] = 674 mot_val[2] = 675 mot_val[0 + stride] = 676 mot_val[2 + stride] = mx; 677 mot_val[1] = 678 mot_val[3] = 679 mot_val[1 + stride] = 680 mot_val[3 + stride] = my; 681 682 if (s->mbintra_table[xy]) 683 ff_clean_intra_table_entries(s); 684 continue; 685 } 686 687 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); 688 if (cbpc < 0) { 689 av_log(s->avctx, AV_LOG_ERROR, 690 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y); 691 return -1; 692 } 693 if (cbpc == 20) 694 goto try_again; 695 696 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant 697 698 s->mb_intra = ((cbpc & 4) != 0); 699 700 if (s->mb_intra) { 701 s->current_picture.mb_type[xy] = MB_TYPE_INTRA; 702 s->mbintra_table[xy] = 1; 703 mot_val[0] = 704 mot_val[2] = 705 mot_val[0 + stride] = 706 mot_val[2 + stride] = 0; 707 mot_val[1] = 708 mot_val[3] = 709 mot_val[1 + stride] = 710 mot_val[3 + stride] = 0; 711 } else { 712 if (s->mbintra_table[xy]) 713 ff_clean_intra_table_entries(s); 714 715 if (s->pict_type == AV_PICTURE_TYPE_S && 716 ctx->vol_sprite_usage == GMC_SPRITE && 717 (cbpc & 16) == 0) 718 s->mcsel = get_bits1(&s->gb); 719 else 720 s->mcsel = 0; 721 722 if ((cbpc & 16) == 0) { 723 /* 16x16 motion prediction */ 724 725 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); 726 if (!s->mcsel) { 727 mx = ff_h263_decode_motion(s, pred_x, s->f_code); 728 if (mx >= 0xffff) 729 return -1; 730 731 my = ff_h263_decode_motion(s, pred_y, s->f_code); 732 if (my >= 0xffff) 733 return -1; 734 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | 735 MB_TYPE_L0; 736 } else { 737 mx = get_amv(ctx, 0); 738 my = get_amv(ctx, 1); 739 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | 740 MB_TYPE_GMC | 741 MB_TYPE_L0; 742 } 743 744 mot_val[0] = 745 mot_val[2] = 746 mot_val[0 + stride] = 747 mot_val[2 + stride] = mx; 748 mot_val[1] = 749 mot_val[3] = 750 mot_val[1 + stride] = 751 mot_val[3 + stride] = my; 752 } else { 753 int i; 754 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | 755 MB_TYPE_L0; 756 for (i = 0; i < 4; i++) { 757 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); 758 mx = ff_h263_decode_motion(s, pred_x, s->f_code); 759 if (mx >= 0xffff) 760 return -1; 761 762 my = ff_h263_decode_motion(s, pred_y, s->f_code); 763 if (my >= 0xffff) 764 return -1; 765 mot_val[0] = mx; 766 mot_val[1] = my; 767 } 768 } 769 } 770 } 771 } 772 s->mb_x = 0; 773 } 774 775 return mb_num; 776} 777 778/** 779 * decode second partition. 780 * @return <0 if an error occurred 781 */ 782static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count) 783{ 784 int mb_num = 0; 785 static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; 786 787 s->mb_x = s->resync_mb_x; 788 s->first_slice_line = 1; 789 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) { 790 ff_init_block_index(s); 791 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) { 792 const int xy = s->mb_x + s->mb_y * s->mb_stride; 793 794 mb_num++; 795 ff_update_block_index(s); 796 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) 797 s->first_slice_line = 0; 798 799 if (s->pict_type == AV_PICTURE_TYPE_I) { 800 int ac_pred = get_bits1(&s->gb); 801 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); 802 if (cbpy < 0) { 803 av_log(s->avctx, AV_LOG_ERROR, 804 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); 805 return -1; 806 } 807 808 s->cbp_table[xy] |= cbpy << 2; 809 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED; 810 } else { /* P || S_TYPE */ 811 if (IS_INTRA(s->current_picture.mb_type[xy])) { 812 int i; 813 int dir = 0; 814 int ac_pred = get_bits1(&s->gb); 815 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); 816 817 if (cbpy < 0) { 818 av_log(s->avctx, AV_LOG_ERROR, 819 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); 820 return -1; 821 } 822 823 if (s->cbp_table[xy] & 8) 824 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 825 s->current_picture.qscale_table[xy] = s->qscale; 826 827 for (i = 0; i < 6; i++) { 828 int dc_pred_dir; 829 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir); 830 if (dc < 0) { 831 av_log(s->avctx, AV_LOG_ERROR, 832 "DC corrupted at %d %d\n", s->mb_x, s->mb_y); 833 return -1; 834 } 835 dir <<= 1; 836 if (dc_pred_dir) 837 dir |= 1; 838 } 839 s->cbp_table[xy] &= 3; // remove dquant 840 s->cbp_table[xy] |= cbpy << 2; 841 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED; 842 s->pred_dir_table[xy] = dir; 843 } else if (IS_SKIP(s->current_picture.mb_type[xy])) { 844 s->current_picture.qscale_table[xy] = s->qscale; 845 s->cbp_table[xy] = 0; 846 } else { 847 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); 848 849 if (cbpy < 0) { 850 av_log(s->avctx, AV_LOG_ERROR, 851 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); 852 return -1; 853 } 854 855 if (s->cbp_table[xy] & 8) 856 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 857 s->current_picture.qscale_table[xy] = s->qscale; 858 859 s->cbp_table[xy] &= 3; // remove dquant 860 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2; 861 } 862 } 863 } 864 if (mb_num >= mb_count) 865 return 0; 866 s->mb_x = 0; 867 } 868 return 0; 869} 870 871/** 872 * Decode the first and second partition. 873 * @return <0 if error (and sets error type in the error_status_table) 874 */ 875int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx) 876{ 877 MpegEncContext *s = &ctx->m; 878 int mb_num; 879 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR; 880 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END; 881 882 mb_num = mpeg4_decode_partition_a(ctx); 883 if (mb_num < 0) { 884 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 885 s->mb_x, s->mb_y, part_a_error); 886 return -1; 887 } 888 889 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) { 890 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n"); 891 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 892 s->mb_x, s->mb_y, part_a_error); 893 return -1; 894 } 895 896 s->mb_num_left = mb_num; 897 898 if (s->pict_type == AV_PICTURE_TYPE_I) { 899 while (show_bits(&s->gb, 9) == 1) 900 skip_bits(&s->gb, 9); 901 if (get_bits_long(&s->gb, 19) != DC_MARKER) { 902 av_log(s->avctx, AV_LOG_ERROR, 903 "marker missing after first I partition at %d %d\n", 904 s->mb_x, s->mb_y); 905 return -1; 906 } 907 } else { 908 while (show_bits(&s->gb, 10) == 1) 909 skip_bits(&s->gb, 10); 910 if (get_bits(&s->gb, 17) != MOTION_MARKER) { 911 av_log(s->avctx, AV_LOG_ERROR, 912 "marker missing after first P partition at %d %d\n", 913 s->mb_x, s->mb_y); 914 return -1; 915 } 916 } 917 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 918 s->mb_x - 1, s->mb_y, part_a_end); 919 920 if (mpeg4_decode_partition_b(s, mb_num) < 0) { 921 if (s->pict_type == AV_PICTURE_TYPE_P) 922 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 923 s->mb_x, s->mb_y, ER_DC_ERROR); 924 return -1; 925 } else { 926 if (s->pict_type == AV_PICTURE_TYPE_P) 927 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 928 s->mb_x - 1, s->mb_y, ER_DC_END); 929 } 930 931 return 0; 932} 933 934/** 935 * Decode a block. 936 * @return <0 if an error occurred 937 */ 938static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block, 939 int n, int coded, int intra, int rvlc) 940{ 941 MpegEncContext *s = &ctx->m; 942 int level, i, last, run, qmul, qadd; 943 int av_uninit(dc_pred_dir); 944 RLTable *rl; 945 RL_VLC_ELEM *rl_vlc; 946 const uint8_t *scan_table; 947 948 // Note intra & rvlc should be optimized away if this is inlined 949 950 if (intra) { 951 if (ctx->use_intra_dc_vlc) { 952 /* DC coef */ 953 if (s->partitioned_frame) { 954 level = s->dc_val[0][s->block_index[n]]; 955 if (n < 4) 956 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale); 957 else 958 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale); 959 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32; 960 } else { 961 level = mpeg4_decode_dc(s, n, &dc_pred_dir); 962 if (level < 0) 963 return -1; 964 } 965 block[0] = level; 966 i = 0; 967 } else { 968 i = -1; 969 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0); 970 } 971 if (!coded) 972 goto not_coded; 973 974 if (rvlc) { 975 rl = &ff_rvlc_rl_intra; 976 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0]; 977 } else { 978 rl = &ff_mpeg4_rl_intra; 979 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0]; 980 } 981 if (s->ac_pred) { 982 if (dc_pred_dir == 0) 983 scan_table = s->intra_v_scantable.permutated; /* left */ 984 else 985 scan_table = s->intra_h_scantable.permutated; /* top */ 986 } else { 987 scan_table = s->intra_scantable.permutated; 988 } 989 qmul = 1; 990 qadd = 0; 991 } else { 992 i = -1; 993 if (!coded) { 994 s->block_last_index[n] = i; 995 return 0; 996 } 997 if (rvlc) 998 rl = &ff_rvlc_rl_inter; 999 else 1000 rl = &ff_h263_rl_inter; 1001 1002 scan_table = s->intra_scantable.permutated; 1003 1004 if (s->mpeg_quant) { 1005 qmul = 1; 1006 qadd = 0; 1007 if (rvlc) 1008 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0]; 1009 else 1010 rl_vlc = ff_h263_rl_inter.rl_vlc[0]; 1011 } else { 1012 qmul = s->qscale << 1; 1013 qadd = (s->qscale - 1) | 1; 1014 if (rvlc) 1015 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale]; 1016 else 1017 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale]; 1018 } 1019 } 1020 { 1021 OPEN_READER(re, &s->gb); 1022 for (;;) { 1023 UPDATE_CACHE(re, &s->gb); 1024 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0); 1025 if (level == 0) { 1026 /* escape */ 1027 if (rvlc) { 1028 if (SHOW_UBITS(re, &s->gb, 1) == 0) { 1029 av_log(s->avctx, AV_LOG_ERROR, 1030 "1. marker bit missing in rvlc esc\n"); 1031 return -1; 1032 } 1033 SKIP_CACHE(re, &s->gb, 1); 1034 1035 last = SHOW_UBITS(re, &s->gb, 1); 1036 SKIP_CACHE(re, &s->gb, 1); 1037 run = SHOW_UBITS(re, &s->gb, 6); 1038 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6); 1039 UPDATE_CACHE(re, &s->gb); 1040 1041 if (SHOW_UBITS(re, &s->gb, 1) == 0) { 1042 av_log(s->avctx, AV_LOG_ERROR, 1043 "2. marker bit missing in rvlc esc\n"); 1044 return -1; 1045 } 1046 SKIP_CACHE(re, &s->gb, 1); 1047 1048 level = SHOW_UBITS(re, &s->gb, 11); 1049 SKIP_CACHE(re, &s->gb, 11); 1050 1051 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) { 1052 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n"); 1053 return -1; 1054 } 1055 SKIP_CACHE(re, &s->gb, 5); 1056 1057 level = level * qmul + qadd; 1058 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 1059 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1); 1060 1061 i += run + 1; 1062 if (last) 1063 i += 192; 1064 } else { 1065 int cache; 1066 cache = GET_CACHE(re, &s->gb); 1067 1068 if (IS_3IV1) 1069 cache ^= 0xC0000000; 1070 1071 if (cache & 0x80000000) { 1072 if (cache & 0x40000000) { 1073 /* third escape */ 1074 SKIP_CACHE(re, &s->gb, 2); 1075 last = SHOW_UBITS(re, &s->gb, 1); 1076 SKIP_CACHE(re, &s->gb, 1); 1077 run = SHOW_UBITS(re, &s->gb, 6); 1078 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6); 1079 UPDATE_CACHE(re, &s->gb); 1080 1081 if (IS_3IV1) { 1082 level = SHOW_SBITS(re, &s->gb, 12); 1083 LAST_SKIP_BITS(re, &s->gb, 12); 1084 } else { 1085 if (SHOW_UBITS(re, &s->gb, 1) == 0) { 1086 av_log(s->avctx, AV_LOG_ERROR, 1087 "1. marker bit missing in 3. esc\n"); 1088 if (!(s->err_recognition & AV_EF_IGNORE_ERR)) 1089 return -1; 1090 } 1091 SKIP_CACHE(re, &s->gb, 1); 1092 1093 level = SHOW_SBITS(re, &s->gb, 12); 1094 SKIP_CACHE(re, &s->gb, 12); 1095 1096 if (SHOW_UBITS(re, &s->gb, 1) == 0) { 1097 av_log(s->avctx, AV_LOG_ERROR, 1098 "2. marker bit missing in 3. esc\n"); 1099 if (!(s->err_recognition & AV_EF_IGNORE_ERR)) 1100 return -1; 1101 } 1102 1103 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1); 1104 } 1105 1106#if 0 1107 if (s->error_recognition >= FF_ER_COMPLIANT) { 1108 const int abs_level= FFABS(level); 1109 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) { 1110 const int run1= run - rl->max_run[last][abs_level] - 1; 1111 if (abs_level <= rl->max_level[last][run]) { 1112 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n"); 1113 return -1; 1114 } 1115 if (s->error_recognition > FF_ER_COMPLIANT) { 1116 if (abs_level <= rl->max_level[last][run]*2) { 1117 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n"); 1118 return -1; 1119 } 1120 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) { 1121 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n"); 1122 return -1; 1123 } 1124 } 1125 } 1126 } 1127#endif 1128 if (level > 0) 1129 level = level * qmul + qadd; 1130 else 1131 level = level * qmul - qadd; 1132 1133 if ((unsigned)(level + 2048) > 4095) { 1134 if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) { 1135 if (level > 2560 || level < -2560) { 1136 av_log(s->avctx, AV_LOG_ERROR, 1137 "|level| overflow in 3. esc, qp=%d\n", 1138 s->qscale); 1139 return -1; 1140 } 1141 } 1142 level = level < 0 ? -2048 : 2047; 1143 } 1144 1145 i += run + 1; 1146 if (last) 1147 i += 192; 1148 } else { 1149 /* second escape */ 1150 SKIP_BITS(re, &s->gb, 2); 1151 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); 1152 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing 1153 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 1154 LAST_SKIP_BITS(re, &s->gb, 1); 1155 } 1156 } else { 1157 /* first escape */ 1158 SKIP_BITS(re, &s->gb, 1); 1159 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); 1160 i += run; 1161 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing 1162 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 1163 LAST_SKIP_BITS(re, &s->gb, 1); 1164 } 1165 } 1166 } else { 1167 i += run; 1168 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 1169 LAST_SKIP_BITS(re, &s->gb, 1); 1170 } 1171 tprintf(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62); 1172 if (i > 62) { 1173 i -= 192; 1174 if (i & (~63)) { 1175 av_log(s->avctx, AV_LOG_ERROR, 1176 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); 1177 return -1; 1178 } 1179 1180 block[scan_table[i]] = level; 1181 break; 1182 } 1183 1184 block[scan_table[i]] = level; 1185 } 1186 CLOSE_READER(re, &s->gb); 1187 } 1188 1189not_coded: 1190 if (intra) { 1191 if (!ctx->use_intra_dc_vlc) { 1192 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0); 1193 1194 i -= i >> 31; // if (i == -1) i = 0; 1195 } 1196 1197 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir); 1198 if (s->ac_pred) 1199 i = 63; // FIXME not optimal 1200 } 1201 s->block_last_index[n] = i; 1202 return 0; 1203} 1204 1205/** 1206 * decode partition C of one MB. 1207 * @return <0 if an error occurred 1208 */ 1209static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64]) 1210{ 1211 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s; 1212 int cbp, mb_type; 1213 const int xy = s->mb_x + s->mb_y * s->mb_stride; 1214 1215 mb_type = s->current_picture.mb_type[xy]; 1216 cbp = s->cbp_table[xy]; 1217 1218 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold; 1219 1220 if (s->current_picture.qscale_table[xy] != s->qscale) 1221 ff_set_qscale(s, s->current_picture.qscale_table[xy]); 1222 1223 if (s->pict_type == AV_PICTURE_TYPE_P || 1224 s->pict_type == AV_PICTURE_TYPE_S) { 1225 int i; 1226 for (i = 0; i < 4; i++) { 1227 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0]; 1228 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1]; 1229 } 1230 s->mb_intra = IS_INTRA(mb_type); 1231 1232 if (IS_SKIP(mb_type)) { 1233 /* skip mb */ 1234 for (i = 0; i < 6; i++) 1235 s->block_last_index[i] = -1; 1236 s->mv_dir = MV_DIR_FORWARD; 1237 s->mv_type = MV_TYPE_16X16; 1238 if (s->pict_type == AV_PICTURE_TYPE_S 1239 && ctx->vol_sprite_usage == GMC_SPRITE) { 1240 s->mcsel = 1; 1241 s->mb_skipped = 0; 1242 } else { 1243 s->mcsel = 0; 1244 s->mb_skipped = 1; 1245 } 1246 } else if (s->mb_intra) { 1247 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]); 1248 } else if (!s->mb_intra) { 1249 // s->mcsel = 0; // FIXME do we need to init that? 1250 1251 s->mv_dir = MV_DIR_FORWARD; 1252 if (IS_8X8(mb_type)) { 1253 s->mv_type = MV_TYPE_8X8; 1254 } else { 1255 s->mv_type = MV_TYPE_16X16; 1256 } 1257 } 1258 } else { /* I-Frame */ 1259 s->mb_intra = 1; 1260 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]); 1261 } 1262 1263 if (!IS_SKIP(mb_type)) { 1264 int i; 1265 s->bdsp.clear_blocks(s->block[0]); 1266 /* decode each block */ 1267 for (i = 0; i < 6; i++) { 1268 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) { 1269 av_log(s->avctx, AV_LOG_ERROR, 1270 "texture corrupted at %d %d %d\n", 1271 s->mb_x, s->mb_y, s->mb_intra); 1272 return -1; 1273 } 1274 cbp += cbp; 1275 } 1276 } 1277 1278 /* per-MB end of slice check */ 1279 if (--s->mb_num_left <= 0) { 1280 if (mpeg4_is_resync(ctx)) 1281 return SLICE_END; 1282 else 1283 return SLICE_NOEND; 1284 } else { 1285 if (mpeg4_is_resync(ctx)) { 1286 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1; 1287 if (s->cbp_table[xy + delta]) 1288 return SLICE_END; 1289 } 1290 return SLICE_OK; 1291 } 1292} 1293 1294static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64]) 1295{ 1296 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s; 1297 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant; 1298 int16_t *mot_val; 1299 static int8_t quant_tab[4] = { -1, -2, 1, 2 }; 1300 const int xy = s->mb_x + s->mb_y * s->mb_stride; 1301 1302 av_assert2(s->h263_pred); 1303 1304 if (s->pict_type == AV_PICTURE_TYPE_P || 1305 s->pict_type == AV_PICTURE_TYPE_S) { 1306 do { 1307 if (get_bits1(&s->gb)) { 1308 /* skip mb */ 1309 s->mb_intra = 0; 1310 for (i = 0; i < 6; i++) 1311 s->block_last_index[i] = -1; 1312 s->mv_dir = MV_DIR_FORWARD; 1313 s->mv_type = MV_TYPE_16X16; 1314 if (s->pict_type == AV_PICTURE_TYPE_S && 1315 ctx->vol_sprite_usage == GMC_SPRITE) { 1316 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | 1317 MB_TYPE_GMC | 1318 MB_TYPE_16x16 | 1319 MB_TYPE_L0; 1320 s->mcsel = 1; 1321 s->mv[0][0][0] = get_amv(ctx, 0); 1322 s->mv[0][0][1] = get_amv(ctx, 1); 1323 s->mb_skipped = 0; 1324 } else { 1325 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | 1326 MB_TYPE_16x16 | 1327 MB_TYPE_L0; 1328 s->mcsel = 0; 1329 s->mv[0][0][0] = 0; 1330 s->mv[0][0][1] = 0; 1331 s->mb_skipped = 1; 1332 } 1333 goto end; 1334 } 1335 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); 1336 if (cbpc < 0) { 1337 av_log(s->avctx, AV_LOG_ERROR, 1338 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y); 1339 return -1; 1340 } 1341 } while (cbpc == 20); 1342 1343 s->bdsp.clear_blocks(s->block[0]); 1344 dquant = cbpc & 8; 1345 s->mb_intra = ((cbpc & 4) != 0); 1346 if (s->mb_intra) 1347 goto intra; 1348 1349 if (s->pict_type == AV_PICTURE_TYPE_S && 1350 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0) 1351 s->mcsel = get_bits1(&s->gb); 1352 else 1353 s->mcsel = 0; 1354 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F; 1355 1356 cbp = (cbpc & 3) | (cbpy << 2); 1357 if (dquant) 1358 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 1359 if ((!s->progressive_sequence) && 1360 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE))) 1361 s->interlaced_dct = get_bits1(&s->gb); 1362 1363 s->mv_dir = MV_DIR_FORWARD; 1364 if ((cbpc & 16) == 0) { 1365 if (s->mcsel) { 1366 s->current_picture.mb_type[xy] = MB_TYPE_GMC | 1367 MB_TYPE_16x16 | 1368 MB_TYPE_L0; 1369 /* 16x16 global motion prediction */ 1370 s->mv_type = MV_TYPE_16X16; 1371 mx = get_amv(ctx, 0); 1372 my = get_amv(ctx, 1); 1373 s->mv[0][0][0] = mx; 1374 s->mv[0][0][1] = my; 1375 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) { 1376 s->current_picture.mb_type[xy] = MB_TYPE_16x8 | 1377 MB_TYPE_L0 | 1378 MB_TYPE_INTERLACED; 1379 /* 16x8 field motion prediction */ 1380 s->mv_type = MV_TYPE_FIELD; 1381 1382 s->field_select[0][0] = get_bits1(&s->gb); 1383 s->field_select[0][1] = get_bits1(&s->gb); 1384 1385 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); 1386 1387 for (i = 0; i < 2; i++) { 1388 mx = ff_h263_decode_motion(s, pred_x, s->f_code); 1389 if (mx >= 0xffff) 1390 return -1; 1391 1392 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code); 1393 if (my >= 0xffff) 1394 return -1; 1395 1396 s->mv[0][i][0] = mx; 1397 s->mv[0][i][1] = my; 1398 } 1399 } else { 1400 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0; 1401 /* 16x16 motion prediction */ 1402 s->mv_type = MV_TYPE_16X16; 1403 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); 1404 mx = ff_h263_decode_motion(s, pred_x, s->f_code); 1405 1406 if (mx >= 0xffff) 1407 return -1; 1408 1409 my = ff_h263_decode_motion(s, pred_y, s->f_code); 1410 1411 if (my >= 0xffff) 1412 return -1; 1413 s->mv[0][0][0] = mx; 1414 s->mv[0][0][1] = my; 1415 } 1416 } else { 1417 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0; 1418 s->mv_type = MV_TYPE_8X8; 1419 for (i = 0; i < 4; i++) { 1420 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); 1421 mx = ff_h263_decode_motion(s, pred_x, s->f_code); 1422 if (mx >= 0xffff) 1423 return -1; 1424 1425 my = ff_h263_decode_motion(s, pred_y, s->f_code); 1426 if (my >= 0xffff) 1427 return -1; 1428 s->mv[0][i][0] = mx; 1429 s->mv[0][i][1] = my; 1430 mot_val[0] = mx; 1431 mot_val[1] = my; 1432 } 1433 } 1434 } else if (s->pict_type == AV_PICTURE_TYPE_B) { 1435 int modb1; // first bit of modb 1436 int modb2; // second bit of modb 1437 int mb_type; 1438 1439 s->mb_intra = 0; // B-frames never contain intra blocks 1440 s->mcsel = 0; // ... true gmc blocks 1441 1442 if (s->mb_x == 0) { 1443 for (i = 0; i < 2; i++) { 1444 s->last_mv[i][0][0] = 1445 s->last_mv[i][0][1] = 1446 s->last_mv[i][1][0] = 1447 s->last_mv[i][1][1] = 0; 1448 } 1449 1450 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0); 1451 } 1452 1453 /* if we skipped it in the future P Frame than skip it now too */ 1454 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC 1455 1456 if (s->mb_skipped) { 1457 /* skip mb */ 1458 for (i = 0; i < 6; i++) 1459 s->block_last_index[i] = -1; 1460 1461 s->mv_dir = MV_DIR_FORWARD; 1462 s->mv_type = MV_TYPE_16X16; 1463 s->mv[0][0][0] = 1464 s->mv[0][0][1] = 1465 s->mv[1][0][0] = 1466 s->mv[1][0][1] = 0; 1467 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | 1468 MB_TYPE_16x16 | 1469 MB_TYPE_L0; 1470 goto end; 1471 } 1472 1473 modb1 = get_bits1(&s->gb); 1474 if (modb1) { 1475 // like MB_TYPE_B_DIRECT but no vectors coded 1476 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; 1477 cbp = 0; 1478 } else { 1479 modb2 = get_bits1(&s->gb); 1480 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1); 1481 if (mb_type < 0) { 1482 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n"); 1483 return -1; 1484 } 1485 mb_type = mb_type_b_map[mb_type]; 1486 if (modb2) { 1487 cbp = 0; 1488 } else { 1489 s->bdsp.clear_blocks(s->block[0]); 1490 cbp = get_bits(&s->gb, 6); 1491 } 1492 1493 if ((!IS_DIRECT(mb_type)) && cbp) { 1494 if (get_bits1(&s->gb)) 1495 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2); 1496 } 1497 1498 if (!s->progressive_sequence) { 1499 if (cbp) 1500 s->interlaced_dct = get_bits1(&s->gb); 1501 1502 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) { 1503 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 1504 mb_type &= ~MB_TYPE_16x16; 1505 1506 if (USES_LIST(mb_type, 0)) { 1507 s->field_select[0][0] = get_bits1(&s->gb); 1508 s->field_select[0][1] = get_bits1(&s->gb); 1509 } 1510 if (USES_LIST(mb_type, 1)) { 1511 s->field_select[1][0] = get_bits1(&s->gb); 1512 s->field_select[1][1] = get_bits1(&s->gb); 1513 } 1514 } 1515 } 1516 1517 s->mv_dir = 0; 1518 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) { 1519 s->mv_type = MV_TYPE_16X16; 1520 1521 if (USES_LIST(mb_type, 0)) { 1522 s->mv_dir = MV_DIR_FORWARD; 1523 1524 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code); 1525 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code); 1526 s->last_mv[0][1][0] = 1527 s->last_mv[0][0][0] = 1528 s->mv[0][0][0] = mx; 1529 s->last_mv[0][1][1] = 1530 s->last_mv[0][0][1] = 1531 s->mv[0][0][1] = my; 1532 } 1533 1534 if (USES_LIST(mb_type, 1)) { 1535 s->mv_dir |= MV_DIR_BACKWARD; 1536 1537 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code); 1538 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code); 1539 s->last_mv[1][1][0] = 1540 s->last_mv[1][0][0] = 1541 s->mv[1][0][0] = mx; 1542 s->last_mv[1][1][1] = 1543 s->last_mv[1][0][1] = 1544 s->mv[1][0][1] = my; 1545 } 1546 } else if (!IS_DIRECT(mb_type)) { 1547 s->mv_type = MV_TYPE_FIELD; 1548 1549 if (USES_LIST(mb_type, 0)) { 1550 s->mv_dir = MV_DIR_FORWARD; 1551 1552 for (i = 0; i < 2; i++) { 1553 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code); 1554 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code); 1555 s->last_mv[0][i][0] = 1556 s->mv[0][i][0] = mx; 1557 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2; 1558 } 1559 } 1560 1561 if (USES_LIST(mb_type, 1)) { 1562 s->mv_dir |= MV_DIR_BACKWARD; 1563 1564 for (i = 0; i < 2; i++) { 1565 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code); 1566 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code); 1567 s->last_mv[1][i][0] = 1568 s->mv[1][i][0] = mx; 1569 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2; 1570 } 1571 } 1572 } 1573 } 1574 1575 if (IS_DIRECT(mb_type)) { 1576 if (IS_SKIP(mb_type)) { 1577 mx = 1578 my = 0; 1579 } else { 1580 mx = ff_h263_decode_motion(s, 0, 1); 1581 my = ff_h263_decode_motion(s, 0, 1); 1582 } 1583 1584 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT; 1585 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my); 1586 } 1587 s->current_picture.mb_type[xy] = mb_type; 1588 } else { /* I-Frame */ 1589 do { 1590 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); 1591 if (cbpc < 0) { 1592 av_log(s->avctx, AV_LOG_ERROR, 1593 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y); 1594 return -1; 1595 } 1596 } while (cbpc == 8); 1597 1598 dquant = cbpc & 4; 1599 s->mb_intra = 1; 1600 1601intra: 1602 s->ac_pred = get_bits1(&s->gb); 1603 if (s->ac_pred) 1604 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED; 1605 else 1606 s->current_picture.mb_type[xy] = MB_TYPE_INTRA; 1607 1608 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); 1609 if (cbpy < 0) { 1610 av_log(s->avctx, AV_LOG_ERROR, 1611 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y); 1612 return -1; 1613 } 1614 cbp = (cbpc & 3) | (cbpy << 2); 1615 1616 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold; 1617 1618 if (dquant) 1619 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); 1620 1621 if (!s->progressive_sequence) 1622 s->interlaced_dct = get_bits1(&s->gb); 1623 1624 s->bdsp.clear_blocks(s->block[0]); 1625 /* decode each block */ 1626 for (i = 0; i < 6; i++) { 1627 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0) 1628 return -1; 1629 cbp += cbp; 1630 } 1631 goto end; 1632 } 1633 1634 /* decode each block */ 1635 for (i = 0; i < 6; i++) { 1636 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0) 1637 return -1; 1638 cbp += cbp; 1639 } 1640 1641end: 1642 /* per-MB end of slice check */ 1643 if (s->codec_id == AV_CODEC_ID_MPEG4) { 1644 int next = mpeg4_is_resync(ctx); 1645 if (next) { 1646 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) { 1647 return -1; 1648 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next) 1649 return SLICE_END; 1650 1651 if (s->pict_type == AV_PICTURE_TYPE_B) { 1652 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1; 1653 ff_thread_await_progress(&s->next_picture_ptr->tf, 1654 (s->mb_x + delta >= s->mb_width) 1655 ? FFMIN(s->mb_y + 1, s->mb_height - 1) 1656 : s->mb_y, 0); 1657 if (s->next_picture.mbskip_table[xy + delta]) 1658 return SLICE_OK; 1659 } 1660 1661 return SLICE_END; 1662 } 1663 } 1664 1665 return SLICE_OK; 1666} 1667 1668static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb) 1669{ 1670 int hours, minutes, seconds; 1671 1672 if (!show_bits(gb, 23)) { 1673 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n"); 1674 return -1; 1675 } 1676 1677 hours = get_bits(gb, 5); 1678 minutes = get_bits(gb, 6); 1679 skip_bits1(gb); 1680 seconds = get_bits(gb, 6); 1681 1682 s->time_base = seconds + 60*(minutes + 60*hours); 1683 1684 skip_bits1(gb); 1685 skip_bits1(gb); 1686 1687 return 0; 1688} 1689 1690static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb) 1691{ 1692 1693 s->avctx->profile = get_bits(gb, 4); 1694 s->avctx->level = get_bits(gb, 4); 1695 1696 // for Simple profile, level 0 1697 if (s->avctx->profile == 0 && s->avctx->level == 8) { 1698 s->avctx->level = 0; 1699 } 1700 1701 return 0; 1702} 1703 1704static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb) 1705{ 1706 MpegEncContext *s = &ctx->m; 1707 int width, height, vo_ver_id; 1708 1709 /* vol header */ 1710 skip_bits(gb, 1); /* random access */ 1711 s->vo_type = get_bits(gb, 8); 1712 if (get_bits1(gb) != 0) { /* is_ol_id */ 1713 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */ 1714 skip_bits(gb, 3); /* vo_priority */ 1715 } else { 1716 vo_ver_id = 1; 1717 } 1718 s->aspect_ratio_info = get_bits(gb, 4); 1719 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) { 1720 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width 1721 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height 1722 } else { 1723 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info]; 1724 } 1725 1726 if ((s->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */ 1727 int chroma_format = get_bits(gb, 2); 1728 if (chroma_format != CHROMA_420) 1729 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n"); 1730 1731 s->low_delay = get_bits1(gb); 1732 if (get_bits1(gb)) { /* vbv parameters */ 1733 get_bits(gb, 15); /* first_half_bitrate */ 1734 skip_bits1(gb); /* marker */ 1735 get_bits(gb, 15); /* latter_half_bitrate */ 1736 skip_bits1(gb); /* marker */ 1737 get_bits(gb, 15); /* first_half_vbv_buffer_size */ 1738 skip_bits1(gb); /* marker */ 1739 get_bits(gb, 3); /* latter_half_vbv_buffer_size */ 1740 get_bits(gb, 11); /* first_half_vbv_occupancy */ 1741 skip_bits1(gb); /* marker */ 1742 get_bits(gb, 15); /* latter_half_vbv_occupancy */ 1743 skip_bits1(gb); /* marker */ 1744 } 1745 } else { 1746 /* is setting low delay flag only once the smartest thing to do? 1747 * low delay detection won't be overridden. */ 1748 if (s->picture_number == 0) 1749 s->low_delay = 0; 1750 } 1751 1752 ctx->shape = get_bits(gb, 2); /* vol shape */ 1753 if (ctx->shape != RECT_SHAPE) 1754 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n"); 1755 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) { 1756 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n"); 1757 skip_bits(gb, 4); /* video_object_layer_shape_extension */ 1758 } 1759 1760 check_marker(gb, "before time_increment_resolution"); 1761 1762 s->avctx->time_base.den = get_bits(gb, 16); 1763 if (!s->avctx->time_base.den) { 1764 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n"); 1765 s->avctx->time_base.num = 0; 1766 return -1; 1767 } 1768 1769 ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1; 1770 if (ctx->time_increment_bits < 1) 1771 ctx->time_increment_bits = 1; 1772 1773 check_marker(gb, "before fixed_vop_rate"); 1774 1775 if (get_bits1(gb) != 0) /* fixed_vop_rate */ 1776 s->avctx->time_base.num = get_bits(gb, ctx->time_increment_bits); 1777 else 1778 s->avctx->time_base.num = 1; 1779 1780 ctx->t_frame = 0; 1781 1782 if (ctx->shape != BIN_ONLY_SHAPE) { 1783 if (ctx->shape == RECT_SHAPE) { 1784 check_marker(gb, "before width"); 1785 width = get_bits(gb, 13); 1786 check_marker(gb, "before height"); 1787 height = get_bits(gb, 13); 1788 check_marker(gb, "after height"); 1789 if (width && height && /* they should be non zero but who knows */ 1790 !(s->width && s->codec_tag == AV_RL32("MP4S"))) { 1791 if (s->width && s->height && 1792 (s->width != width || s->height != height)) 1793 s->context_reinit = 1; 1794 s->width = width; 1795 s->height = height; 1796 } 1797 } 1798 1799 s->progressive_sequence = 1800 s->progressive_frame = get_bits1(gb) ^ 1; 1801 s->interlaced_dct = 0; 1802 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO)) 1803 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */ 1804 "MPEG4 OBMC not supported (very likely buggy encoder)\n"); 1805 if (vo_ver_id == 1) 1806 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */ 1807 else 1808 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */ 1809 1810 if (ctx->vol_sprite_usage == STATIC_SPRITE) 1811 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n"); 1812 if (ctx->vol_sprite_usage == STATIC_SPRITE || 1813 ctx->vol_sprite_usage == GMC_SPRITE) { 1814 if (ctx->vol_sprite_usage == STATIC_SPRITE) { 1815 skip_bits(gb, 13); // sprite_width 1816 skip_bits1(gb); /* marker */ 1817 skip_bits(gb, 13); // sprite_height 1818 skip_bits1(gb); /* marker */ 1819 skip_bits(gb, 13); // sprite_left 1820 skip_bits1(gb); /* marker */ 1821 skip_bits(gb, 13); // sprite_top 1822 skip_bits1(gb); /* marker */ 1823 } 1824 ctx->num_sprite_warping_points = get_bits(gb, 6); 1825 if (ctx->num_sprite_warping_points > 3) { 1826 av_log(s->avctx, AV_LOG_ERROR, 1827 "%d sprite_warping_points\n", 1828 ctx->num_sprite_warping_points); 1829 ctx->num_sprite_warping_points = 0; 1830 return -1; 1831 } 1832 s->sprite_warping_accuracy = get_bits(gb, 2); 1833 ctx->sprite_brightness_change = get_bits1(gb); 1834 if (ctx->vol_sprite_usage == STATIC_SPRITE) 1835 skip_bits1(gb); // low_latency_sprite 1836 } 1837 // FIXME sadct disable bit if verid!=1 && shape not rect 1838 1839 if (get_bits1(gb) == 1) { /* not_8_bit */ 1840 s->quant_precision = get_bits(gb, 4); /* quant_precision */ 1841 if (get_bits(gb, 4) != 8) /* bits_per_pixel */ 1842 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); 1843 if (s->quant_precision != 5) 1844 av_log(s->avctx, AV_LOG_ERROR, 1845 "quant precision %d\n", s->quant_precision); 1846 if (s->quant_precision<3 || s->quant_precision>9) { 1847 s->quant_precision = 5; 1848 } 1849 } else { 1850 s->quant_precision = 5; 1851 } 1852 1853 // FIXME a bunch of grayscale shape things 1854 1855 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */ 1856 int i, v; 1857 1858 /* load default matrixes */ 1859 for (i = 0; i < 64; i++) { 1860 int j = s->idsp.idct_permutation[i]; 1861 v = ff_mpeg4_default_intra_matrix[i]; 1862 s->intra_matrix[j] = v; 1863 s->chroma_intra_matrix[j] = v; 1864 1865 v = ff_mpeg4_default_non_intra_matrix[i]; 1866 s->inter_matrix[j] = v; 1867 s->chroma_inter_matrix[j] = v; 1868 } 1869 1870 /* load custom intra matrix */ 1871 if (get_bits1(gb)) { 1872 int last = 0; 1873 for (i = 0; i < 64; i++) { 1874 int j; 1875 v = get_bits(gb, 8); 1876 if (v == 0) 1877 break; 1878 1879 last = v; 1880 j = s->idsp.idct_permutation[ff_zigzag_direct[i]]; 1881 s->intra_matrix[j] = last; 1882 s->chroma_intra_matrix[j] = last; 1883 } 1884 1885 /* replicate last value */ 1886 for (; i < 64; i++) { 1887 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]]; 1888 s->intra_matrix[j] = last; 1889 s->chroma_intra_matrix[j] = last; 1890 } 1891 } 1892 1893 /* load custom non intra matrix */ 1894 if (get_bits1(gb)) { 1895 int last = 0; 1896 for (i = 0; i < 64; i++) { 1897 int j; 1898 v = get_bits(gb, 8); 1899 if (v == 0) 1900 break; 1901 1902 last = v; 1903 j = s->idsp.idct_permutation[ff_zigzag_direct[i]]; 1904 s->inter_matrix[j] = v; 1905 s->chroma_inter_matrix[j] = v; 1906 } 1907 1908 /* replicate last value */ 1909 for (; i < 64; i++) { 1910 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]]; 1911 s->inter_matrix[j] = last; 1912 s->chroma_inter_matrix[j] = last; 1913 } 1914 } 1915 1916 // FIXME a bunch of grayscale shape things 1917 } 1918 1919 if (vo_ver_id != 1) 1920 s->quarter_sample = get_bits1(gb); 1921 else 1922 s->quarter_sample = 0; 1923 1924 if (get_bits_left(gb) < 4) { 1925 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n"); 1926 return AVERROR_INVALIDDATA; 1927 } 1928 1929 if (!get_bits1(gb)) { 1930 int pos = get_bits_count(gb); 1931 int estimation_method = get_bits(gb, 2); 1932 if (estimation_method < 2) { 1933 if (!get_bits1(gb)) { 1934 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */ 1935 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */ 1936 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */ 1937 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */ 1938 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */ 1939 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */ 1940 } 1941 if (!get_bits1(gb)) { 1942 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */ 1943 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */ 1944 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */ 1945 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */ 1946 } 1947 if (!check_marker(gb, "in complexity estimation part 1")) { 1948 skip_bits_long(gb, pos - get_bits_count(gb)); 1949 goto no_cplx_est; 1950 } 1951 if (!get_bits1(gb)) { 1952 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */ 1953 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */ 1954 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */ 1955 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */ 1956 } 1957 if (!get_bits1(gb)) { 1958 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */ 1959 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */ 1960 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */ 1961 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */ 1962 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */ 1963 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */ 1964 } 1965 if (!check_marker(gb, "in complexity estimation part 2")) { 1966 skip_bits_long(gb, pos - get_bits_count(gb)); 1967 goto no_cplx_est; 1968 } 1969 if (estimation_method == 1) { 1970 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */ 1971 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */ 1972 } 1973 } else 1974 av_log(s->avctx, AV_LOG_ERROR, 1975 "Invalid Complexity estimation method %d\n", 1976 estimation_method); 1977 } else { 1978 1979no_cplx_est: 1980 ctx->cplx_estimation_trash_i = 1981 ctx->cplx_estimation_trash_p = 1982 ctx->cplx_estimation_trash_b = 0; 1983 } 1984 1985 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */ 1986 1987 s->data_partitioning = get_bits1(gb); 1988 if (s->data_partitioning) 1989 ctx->rvlc = get_bits1(gb); 1990 1991 if (vo_ver_id != 1) { 1992 ctx->new_pred = get_bits1(gb); 1993 if (ctx->new_pred) { 1994 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n"); 1995 skip_bits(gb, 2); /* requested upstream message type */ 1996 skip_bits1(gb); /* newpred segment type */ 1997 } 1998 if (get_bits1(gb)) // reduced_res_vop 1999 av_log(s->avctx, AV_LOG_ERROR, 2000 "reduced resolution VOP not supported\n"); 2001 } else { 2002 ctx->new_pred = 0; 2003 } 2004 2005 ctx->scalability = get_bits1(gb); 2006 2007 if (ctx->scalability) { 2008 GetBitContext bak = *gb; 2009 int h_sampling_factor_n; 2010 int h_sampling_factor_m; 2011 int v_sampling_factor_n; 2012 int v_sampling_factor_m; 2013 2014 skip_bits1(gb); // hierarchy_type 2015 skip_bits(gb, 4); /* ref_layer_id */ 2016 skip_bits1(gb); /* ref_layer_sampling_dir */ 2017 h_sampling_factor_n = get_bits(gb, 5); 2018 h_sampling_factor_m = get_bits(gb, 5); 2019 v_sampling_factor_n = get_bits(gb, 5); 2020 v_sampling_factor_m = get_bits(gb, 5); 2021 ctx->enhancement_type = get_bits1(gb); 2022 2023 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 || 2024 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) { 2025 /* illegal scalability header (VERY broken encoder), 2026 * trying to workaround */ 2027 ctx->scalability = 0; 2028 *gb = bak; 2029 } else 2030 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n"); 2031 2032 // bin shape stuff FIXME 2033 } 2034 } 2035 2036 if (s->avctx->debug&FF_DEBUG_PICT_INFO) { 2037 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n", 2038 s->avctx->time_base.num, s->avctx->time_base.den, 2039 ctx->time_increment_bits, 2040 s->quant_precision, 2041 s->progressive_sequence, 2042 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "", 2043 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : "" 2044 ); 2045 } 2046 2047 return 0; 2048} 2049 2050/** 2051 * Decode the user data stuff in the header. 2052 * Also initializes divx/xvid/lavc_version/build. 2053 */ 2054static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb) 2055{ 2056 MpegEncContext *s = &ctx->m; 2057 char buf[256]; 2058 int i; 2059 int e; 2060 int ver = 0, build = 0, ver2 = 0, ver3 = 0; 2061 char last; 2062 2063 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) { 2064 if (show_bits(gb, 23) == 0) 2065 break; 2066 buf[i] = get_bits(gb, 8); 2067 } 2068 buf[i] = 0; 2069 2070 /* divx detection */ 2071 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last); 2072 if (e < 2) 2073 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last); 2074 if (e >= 2) { 2075 ctx->divx_version = ver; 2076 ctx->divx_build = build; 2077 s->divx_packed = e == 3 && last == 'p'; 2078 if (s->divx_packed && !ctx->showed_packed_warning) { 2079 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and " 2080 "wasteful way to store B-frames ('packed B-frames'). " 2081 "Consider using a tool like VirtualDub or avidemux to fix it.\n"); 2082 ctx->showed_packed_warning = 1; 2083 } 2084 } 2085 2086 /* libavcodec detection */ 2087 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3; 2088 if (e != 4) 2089 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build); 2090 if (e != 4) { 2091 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1; 2092 if (e > 1) 2093 build = (ver << 16) + (ver2 << 8) + ver3; 2094 } 2095 if (e != 4) { 2096 if (strcmp(buf, "ffmpeg") == 0) 2097 ctx->lavc_build = 4600; 2098 } 2099 if (e == 4) 2100 ctx->lavc_build = build; 2101 2102 /* Xvid detection */ 2103 e = sscanf(buf, "XviD%d", &build); 2104 if (e == 1) 2105 ctx->xvid_build = build; 2106 2107 return 0; 2108} 2109 2110int ff_mpeg4_workaround_bugs(AVCodecContext *avctx) 2111{ 2112 Mpeg4DecContext *ctx = avctx->priv_data; 2113 MpegEncContext *s = &ctx->m; 2114 2115 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) { 2116 if (s->stream_codec_tag == AV_RL32("XVID") || 2117 s->codec_tag == AV_RL32("XVID") || 2118 s->codec_tag == AV_RL32("XVIX") || 2119 s->codec_tag == AV_RL32("RMP4") || 2120 s->codec_tag == AV_RL32("ZMP4") || 2121 s->codec_tag == AV_RL32("SIPP")) 2122 ctx->xvid_build = 0; 2123 } 2124 2125 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) 2126 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 && 2127 s->vol_control_parameters == 0) 2128 ctx->divx_version = 400; // divx 4 2129 2130 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) { 2131 ctx->divx_version = 2132 ctx->divx_build = -1; 2133 } 2134 2135 if (s->workaround_bugs & FF_BUG_AUTODETECT) { 2136 if (s->codec_tag == AV_RL32("XVIX")) 2137 s->workaround_bugs |= FF_BUG_XVID_ILACE; 2138 2139 if (s->codec_tag == AV_RL32("UMP4")) 2140 s->workaround_bugs |= FF_BUG_UMP4; 2141 2142 if (ctx->divx_version >= 500 && ctx->divx_build < 1814) 2143 s->workaround_bugs |= FF_BUG_QPEL_CHROMA; 2144 2145 if (ctx->divx_version > 502 && ctx->divx_build < 1814) 2146 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2; 2147 2148 if (ctx->xvid_build <= 3U) 2149 s->padding_bug_score = 256 * 256 * 256 * 64; 2150 2151 if (ctx->xvid_build <= 1U) 2152 s->workaround_bugs |= FF_BUG_QPEL_CHROMA; 2153 2154 if (ctx->xvid_build <= 12U) 2155 s->workaround_bugs |= FF_BUG_EDGE; 2156 2157 if (ctx->xvid_build <= 32U) 2158 s->workaround_bugs |= FF_BUG_DC_CLIP; 2159 2160#define SET_QPEL_FUNC(postfix1, postfix2) \ 2161 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \ 2162 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \ 2163 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2; 2164 2165 if (ctx->lavc_build < 4653U) 2166 s->workaround_bugs |= FF_BUG_STD_QPEL; 2167 2168 if (ctx->lavc_build < 4655U) 2169 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE; 2170 2171 if (ctx->lavc_build < 4670U) 2172 s->workaround_bugs |= FF_BUG_EDGE; 2173 2174 if (ctx->lavc_build <= 4712U) 2175 s->workaround_bugs |= FF_BUG_DC_CLIP; 2176 2177 if (ctx->divx_version >= 0) 2178 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE; 2179 if (ctx->divx_version == 501 && ctx->divx_build == 20020416) 2180 s->padding_bug_score = 256 * 256 * 256 * 64; 2181 2182 if (ctx->divx_version < 500U) 2183 s->workaround_bugs |= FF_BUG_EDGE; 2184 2185 if (ctx->divx_version >= 0) 2186 s->workaround_bugs |= FF_BUG_HPEL_CHROMA; 2187 } 2188 2189 if (s->workaround_bugs & FF_BUG_STD_QPEL) { 2190 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c) 2191 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c) 2192 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c) 2193 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c) 2194 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c) 2195 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c) 2196 2197 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c) 2198 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c) 2199 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c) 2200 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c) 2201 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c) 2202 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c) 2203 } 2204 2205 if (avctx->debug & FF_DEBUG_BUGS) 2206 av_log(s->avctx, AV_LOG_DEBUG, 2207 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", 2208 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build, 2209 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : ""); 2210 2211#if HAVE_MMX 2212 if (s->codec_id == AV_CODEC_ID_MPEG4 && ctx->xvid_build >= 0 && 2213 avctx->idct_algo == FF_IDCT_AUTO && 2214 (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) { 2215 avctx->idct_algo = FF_IDCT_XVIDMMX; 2216 ff_dct_common_init(s); 2217 return 1; 2218 } 2219#endif 2220 return 0; 2221} 2222 2223static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb) 2224{ 2225 MpegEncContext *s = &ctx->m; 2226 int time_incr, time_increment; 2227 int64_t pts; 2228 2229 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */ 2230 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay && 2231 s->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) { 2232 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n"); 2233 s->low_delay = 0; 2234 } 2235 2236 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B; 2237 if (s->partitioned_frame) 2238 s->decode_mb = mpeg4_decode_partitioned_mb; 2239 else 2240 s->decode_mb = mpeg4_decode_mb; 2241 2242 time_incr = 0; 2243 while (get_bits1(gb) != 0) 2244 time_incr++; 2245 2246 check_marker(gb, "before time_increment"); 2247 2248 if (ctx->time_increment_bits == 0 || 2249 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) { 2250 av_log(s->avctx, AV_LOG_ERROR, 2251 "hmm, seems the headers are not complete, trying to guess time_increment_bits\n"); 2252 2253 for (ctx->time_increment_bits = 1; 2254 ctx->time_increment_bits < 16; 2255 ctx->time_increment_bits++) { 2256 if (s->pict_type == AV_PICTURE_TYPE_P || 2257 (s->pict_type == AV_PICTURE_TYPE_S && 2258 ctx->vol_sprite_usage == GMC_SPRITE)) { 2259 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30) 2260 break; 2261 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18) 2262 break; 2263 } 2264 2265 av_log(s->avctx, AV_LOG_ERROR, 2266 "my guess is %d bits ;)\n", ctx->time_increment_bits); 2267 if (s->avctx->time_base.den && 4*s->avctx->time_base.den < 1<<ctx->time_increment_bits) { 2268 s->avctx->time_base.den = 1<<ctx->time_increment_bits; 2269 } 2270 } 2271 2272 if (IS_3IV1) 2273 time_increment = get_bits1(gb); // FIXME investigate further 2274 else 2275 time_increment = get_bits(gb, ctx->time_increment_bits); 2276 2277 if (s->pict_type != AV_PICTURE_TYPE_B) { 2278 s->last_time_base = s->time_base; 2279 s->time_base += time_incr; 2280 s->time = s->time_base * s->avctx->time_base.den + time_increment; 2281 if (s->workaround_bugs & FF_BUG_UMP4) { 2282 if (s->time < s->last_non_b_time) { 2283 /* header is not mpeg-4-compatible, broken encoder, 2284 * trying to workaround */ 2285 s->time_base++; 2286 s->time += s->avctx->time_base.den; 2287 } 2288 } 2289 s->pp_time = s->time - s->last_non_b_time; 2290 s->last_non_b_time = s->time; 2291 } else { 2292 s->time = (s->last_time_base + time_incr) * s->avctx->time_base.den + time_increment; 2293 s->pb_time = s->pp_time - (s->last_non_b_time - s->time); 2294 if (s->pp_time <= s->pb_time || 2295 s->pp_time <= s->pp_time - s->pb_time || 2296 s->pp_time <= 0) { 2297 /* messed up order, maybe after seeking? skipping current b-frame */ 2298 return FRAME_SKIPPED; 2299 } 2300 ff_mpeg4_init_direct_mv(s); 2301 2302 if (ctx->t_frame == 0) 2303 ctx->t_frame = s->pb_time; 2304 if (ctx->t_frame == 0) 2305 ctx->t_frame = 1; // 1/0 protection 2306 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) - 2307 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2; 2308 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) - 2309 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2; 2310 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) { 2311 s->pb_field_time = 2; 2312 s->pp_field_time = 4; 2313 if (!s->progressive_sequence) 2314 return FRAME_SKIPPED; 2315 } 2316 } 2317 2318 if (s->avctx->time_base.num) 2319 pts = ROUNDED_DIV(s->time, s->avctx->time_base.num); 2320 else 2321 pts = AV_NOPTS_VALUE; 2322 if (s->avctx->debug&FF_DEBUG_PTS) 2323 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n", 2324 pts); 2325 2326 check_marker(gb, "before vop_coded"); 2327 2328 /* vop coded */ 2329 if (get_bits1(gb) != 1) { 2330 if (s->avctx->debug & FF_DEBUG_PICT_INFO) 2331 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n"); 2332 return FRAME_SKIPPED; 2333 } 2334 if (ctx->new_pred) 2335 decode_new_pred(ctx, gb); 2336 2337 if (ctx->shape != BIN_ONLY_SHAPE && 2338 (s->pict_type == AV_PICTURE_TYPE_P || 2339 (s->pict_type == AV_PICTURE_TYPE_S && 2340 ctx->vol_sprite_usage == GMC_SPRITE))) { 2341 /* rounding type for motion estimation */ 2342 s->no_rounding = get_bits1(gb); 2343 } else { 2344 s->no_rounding = 0; 2345 } 2346 // FIXME reduced res stuff 2347 2348 if (ctx->shape != RECT_SHAPE) { 2349 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) { 2350 skip_bits(gb, 13); /* width */ 2351 skip_bits1(gb); /* marker */ 2352 skip_bits(gb, 13); /* height */ 2353 skip_bits1(gb); /* marker */ 2354 skip_bits(gb, 13); /* hor_spat_ref */ 2355 skip_bits1(gb); /* marker */ 2356 skip_bits(gb, 13); /* ver_spat_ref */ 2357 } 2358 skip_bits1(gb); /* change_CR_disable */ 2359 2360 if (get_bits1(gb) != 0) 2361 skip_bits(gb, 8); /* constant_alpha_value */ 2362 } 2363 2364 // FIXME complexity estimation stuff 2365 2366 if (ctx->shape != BIN_ONLY_SHAPE) { 2367 skip_bits_long(gb, ctx->cplx_estimation_trash_i); 2368 if (s->pict_type != AV_PICTURE_TYPE_I) 2369 skip_bits_long(gb, ctx->cplx_estimation_trash_p); 2370 if (s->pict_type == AV_PICTURE_TYPE_B) 2371 skip_bits_long(gb, ctx->cplx_estimation_trash_b); 2372 2373 if (get_bits_left(gb) < 3) { 2374 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n"); 2375 return -1; 2376 } 2377 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)]; 2378 if (!s->progressive_sequence) { 2379 s->top_field_first = get_bits1(gb); 2380 s->alternate_scan = get_bits1(gb); 2381 } else 2382 s->alternate_scan = 0; 2383 } 2384 2385 if (s->alternate_scan) { 2386 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan); 2387 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan); 2388 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan); 2389 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan); 2390 } else { 2391 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct); 2392 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct); 2393 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan); 2394 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan); 2395 } 2396 2397 if (s->pict_type == AV_PICTURE_TYPE_S && 2398 (ctx->vol_sprite_usage == STATIC_SPRITE || 2399 ctx->vol_sprite_usage == GMC_SPRITE)) { 2400 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0) 2401 return AVERROR_INVALIDDATA; 2402 if (ctx->sprite_brightness_change) 2403 av_log(s->avctx, AV_LOG_ERROR, 2404 "sprite_brightness_change not supported\n"); 2405 if (ctx->vol_sprite_usage == STATIC_SPRITE) 2406 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n"); 2407 } 2408 2409 if (ctx->shape != BIN_ONLY_SHAPE) { 2410 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision); 2411 if (s->qscale == 0) { 2412 av_log(s->avctx, AV_LOG_ERROR, 2413 "Error, header damaged or not MPEG4 header (qscale=0)\n"); 2414 return -1; // makes no sense to continue, as there is nothing left from the image then 2415 } 2416 2417 if (s->pict_type != AV_PICTURE_TYPE_I) { 2418 s->f_code = get_bits(gb, 3); /* fcode_for */ 2419 if (s->f_code == 0) { 2420 av_log(s->avctx, AV_LOG_ERROR, 2421 "Error, header damaged or not MPEG4 header (f_code=0)\n"); 2422 s->f_code = 1; 2423 return -1; // makes no sense to continue, as there is nothing left from the image then 2424 } 2425 } else 2426 s->f_code = 1; 2427 2428 if (s->pict_type == AV_PICTURE_TYPE_B) { 2429 s->b_code = get_bits(gb, 3); 2430 if (s->b_code == 0) { 2431 av_log(s->avctx, AV_LOG_ERROR, 2432 "Error, header damaged or not MPEG4 header (b_code=0)\n"); 2433 s->b_code=1; 2434 return -1; // makes no sense to continue, as the MV decoding will break very quickly 2435 } 2436 } else 2437 s->b_code = 1; 2438 2439 if (s->avctx->debug & FF_DEBUG_PICT_INFO) { 2440 av_log(s->avctx, AV_LOG_DEBUG, 2441 "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 time:%"PRId64" tincr:%d\n", 2442 s->qscale, s->f_code, s->b_code, 2443 s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")), 2444 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, 2445 s->top_field_first, s->quarter_sample ? "q" : "h", 2446 s->data_partitioning, ctx->resync_marker, 2447 ctx->num_sprite_warping_points, s->sprite_warping_accuracy, 2448 1 - s->no_rounding, s->vo_type, 2449 s->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold, 2450 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p, 2451 ctx->cplx_estimation_trash_b, 2452 s->time, 2453 time_increment 2454 ); 2455 } 2456 2457 if (!ctx->scalability) { 2458 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I) 2459 skip_bits1(gb); // vop shape coding type 2460 } else { 2461 if (ctx->enhancement_type) { 2462 int load_backward_shape = get_bits1(gb); 2463 if (load_backward_shape) 2464 av_log(s->avctx, AV_LOG_ERROR, 2465 "load backward shape isn't supported\n"); 2466 } 2467 skip_bits(gb, 2); // ref_select_code 2468 } 2469 } 2470 /* detect buggy encoders which don't set the low_delay flag 2471 * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames 2472 * easily (although it's buggy too) */ 2473 if (s->vo_type == 0 && s->vol_control_parameters == 0 && 2474 ctx->divx_version == -1 && s->picture_number == 0) { 2475 av_log(s->avctx, AV_LOG_WARNING, 2476 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n"); 2477 s->low_delay = 1; 2478 } 2479 2480 s->picture_number++; // better than pic number==0 always ;) 2481 2482 // FIXME add short header support 2483 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table; 2484 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table; 2485 2486 if (s->workaround_bugs & FF_BUG_EDGE) { 2487 s->h_edge_pos = s->width; 2488 s->v_edge_pos = s->height; 2489 } 2490 return 0; 2491} 2492 2493/** 2494 * Decode mpeg4 headers. 2495 * @return <0 if no VOP found (or a damaged one) 2496 * FRAME_SKIPPED if a not coded VOP is found 2497 * 0 if a VOP is found 2498 */ 2499int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb) 2500{ 2501 MpegEncContext *s = &ctx->m; 2502 unsigned startcode, v; 2503 2504 /* search next start code */ 2505 align_get_bits(gb); 2506 2507 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) { 2508 skip_bits(gb, 24); 2509 if (get_bits(gb, 8) == 0xF0) 2510 goto end; 2511 } 2512 2513 startcode = 0xff; 2514 for (;;) { 2515 if (get_bits_count(gb) >= gb->size_in_bits) { 2516 if (gb->size_in_bits == 8 && 2517 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) { 2518 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits); 2519 return FRAME_SKIPPED; // divx bug 2520 } else 2521 return -1; // end of stream 2522 } 2523 2524 /* use the bits after the test */ 2525 v = get_bits(gb, 8); 2526 startcode = ((startcode << 8) | v) & 0xffffffff; 2527 2528 if ((startcode & 0xFFFFFF00) != 0x100) 2529 continue; // no startcode 2530 2531 if (s->avctx->debug & FF_DEBUG_STARTCODE) { 2532 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode); 2533 if (startcode <= 0x11F) 2534 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start"); 2535 else if (startcode <= 0x12F) 2536 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start"); 2537 else if (startcode <= 0x13F) 2538 av_log(s->avctx, AV_LOG_DEBUG, "Reserved"); 2539 else if (startcode <= 0x15F) 2540 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start"); 2541 else if (startcode <= 0x1AF) 2542 av_log(s->avctx, AV_LOG_DEBUG, "Reserved"); 2543 else if (startcode == 0x1B0) 2544 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start"); 2545 else if (startcode == 0x1B1) 2546 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End"); 2547 else if (startcode == 0x1B2) 2548 av_log(s->avctx, AV_LOG_DEBUG, "User Data"); 2549 else if (startcode == 0x1B3) 2550 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start"); 2551 else if (startcode == 0x1B4) 2552 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error"); 2553 else if (startcode == 0x1B5) 2554 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start"); 2555 else if (startcode == 0x1B6) 2556 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start"); 2557 else if (startcode == 0x1B7) 2558 av_log(s->avctx, AV_LOG_DEBUG, "slice start"); 2559 else if (startcode == 0x1B8) 2560 av_log(s->avctx, AV_LOG_DEBUG, "extension start"); 2561 else if (startcode == 0x1B9) 2562 av_log(s->avctx, AV_LOG_DEBUG, "fgs start"); 2563 else if (startcode == 0x1BA) 2564 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start"); 2565 else if (startcode == 0x1BB) 2566 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start"); 2567 else if (startcode == 0x1BC) 2568 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start"); 2569 else if (startcode == 0x1BD) 2570 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start"); 2571 else if (startcode == 0x1BE) 2572 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start"); 2573 else if (startcode == 0x1BF) 2574 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start"); 2575 else if (startcode == 0x1C0) 2576 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start"); 2577 else if (startcode == 0x1C1) 2578 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start"); 2579 else if (startcode == 0x1C2) 2580 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start"); 2581 else if (startcode == 0x1C3) 2582 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start"); 2583 else if (startcode <= 0x1C5) 2584 av_log(s->avctx, AV_LOG_DEBUG, "reserved"); 2585 else if (startcode <= 0x1FF) 2586 av_log(s->avctx, AV_LOG_DEBUG, "System start"); 2587 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb)); 2588 } 2589 2590 if (startcode >= 0x120 && startcode <= 0x12F) { 2591 if (decode_vol_header(ctx, gb) < 0) 2592 return -1; 2593 } else if (startcode == USER_DATA_STARTCODE) { 2594 decode_user_data(ctx, gb); 2595 } else if (startcode == GOP_STARTCODE) { 2596 mpeg4_decode_gop_header(s, gb); 2597 } else if (startcode == VOS_STARTCODE) { 2598 mpeg4_decode_profile_level(s, gb); 2599 } else if (startcode == VOP_STARTCODE) { 2600 break; 2601 } 2602 2603 align_get_bits(gb); 2604 startcode = 0xff; 2605 } 2606 2607end: 2608 if (s->flags & CODEC_FLAG_LOW_DELAY) 2609 s->low_delay = 1; 2610 s->avctx->has_b_frames = !s->low_delay; 2611 2612 return decode_vop_header(ctx, gb); 2613} 2614 2615av_cold void ff_mpeg4videodec_static_init(void) { 2616 static int done = 0; 2617 2618 if (!done) { 2619 ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]); 2620 ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]); 2621 ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]); 2622 INIT_VLC_RL(ff_mpeg4_rl_intra, 554); 2623 INIT_VLC_RL(ff_rvlc_rl_inter, 1072); 2624 INIT_VLC_RL(ff_rvlc_rl_intra, 1072); 2625 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */, 2626 &ff_mpeg4_DCtab_lum[0][1], 2, 1, 2627 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512); 2628 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */, 2629 &ff_mpeg4_DCtab_chrom[0][1], 2, 1, 2630 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512); 2631 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15, 2632 &ff_sprite_trajectory_tab[0][1], 4, 2, 2633 &ff_sprite_trajectory_tab[0][0], 4, 2, 128); 2634 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4, 2635 &ff_mb_type_b_tab[0][1], 2, 1, 2636 &ff_mb_type_b_tab[0][0], 2, 1, 16); 2637 done = 1; 2638 } 2639} 2640 2641int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size) 2642{ 2643 Mpeg4DecContext *ctx = avctx->priv_data; 2644 MpegEncContext *s = &ctx->m; 2645 2646 /* divx 5.01+ bitstream reorder stuff */ 2647 /* Since this clobbers the input buffer and hwaccel codecs still need the 2648 * data during hwaccel->end_frame we should not do this any earlier */ 2649 if (s->divx_packed) { 2650 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3); 2651 int startcode_found = 0; 2652 2653 if (buf_size - current_pos > 7) { 2654 2655 int i; 2656 for (i = current_pos; i < buf_size - 4; i++) 2657 2658 if (buf[i] == 0 && 2659 buf[i + 1] == 0 && 2660 buf[i + 2] == 1 && 2661 buf[i + 3] == 0xB6) { 2662 startcode_found = !(buf[i + 4] & 0x40); 2663 break; 2664 } 2665 } 2666 2667 if (startcode_found) { 2668 av_fast_padded_malloc(&s->bitstream_buffer, 2669 &s->allocated_bitstream_buffer_size, 2670 buf_size - current_pos); 2671 if (!s->bitstream_buffer) 2672 return AVERROR(ENOMEM); 2673 memcpy(s->bitstream_buffer, buf + current_pos, 2674 buf_size - current_pos); 2675 s->bitstream_buffer_size = buf_size - current_pos; 2676 } 2677 } 2678 2679 return 0; 2680} 2681 2682static int mpeg4_update_thread_context(AVCodecContext *dst, 2683 const AVCodecContext *src) 2684{ 2685 Mpeg4DecContext *s = dst->priv_data; 2686 const Mpeg4DecContext *s1 = src->priv_data; 2687 2688 int ret = ff_mpeg_update_thread_context(dst, src); 2689 2690 if (ret < 0) 2691 return ret; 2692 2693 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext)); 2694 2695 return 0; 2696} 2697 2698static av_cold int decode_init(AVCodecContext *avctx) 2699{ 2700 Mpeg4DecContext *ctx = avctx->priv_data; 2701 MpegEncContext *s = &ctx->m; 2702 int ret; 2703 2704 ctx->divx_version = 2705 ctx->divx_build = 2706 ctx->xvid_build = 2707 ctx->lavc_build = -1; 2708 2709 if ((ret = ff_h263_decode_init(avctx)) < 0) 2710 return ret; 2711 2712 ff_mpeg4videodec_static_init(); 2713 2714 s->h263_pred = 1; 2715 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */ 2716 s->decode_mb = mpeg4_decode_mb; 2717 ctx->time_increment_bits = 4; /* default value for broken headers */ 2718 2719 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; 2720 avctx->internal->allocate_progress = 1; 2721 2722 return 0; 2723} 2724 2725static const AVProfile mpeg4_video_profiles[] = { 2726 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" }, 2727 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" }, 2728 { FF_PROFILE_MPEG4_CORE, "Core Profile" }, 2729 { FF_PROFILE_MPEG4_MAIN, "Main Profile" }, 2730 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" }, 2731 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" }, 2732 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" }, 2733 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" }, 2734 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" }, 2735 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" }, 2736 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" }, 2737 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" }, 2738 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" }, 2739 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" }, 2740 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" }, 2741 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" }, 2742 { FF_PROFILE_UNKNOWN }, 2743}; 2744 2745static const AVOption mpeg4_options[] = { 2746 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0}, 2747 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0}, 2748 {NULL} 2749}; 2750 2751static const AVClass mpeg4_class = { 2752 "MPEG4 Video Decoder", 2753 av_default_item_name, 2754 mpeg4_options, 2755 LIBAVUTIL_VERSION_INT, 2756}; 2757 2758static const AVClass mpeg4_vdpau_class = { 2759 "MPEG4 Video VDPAU Decoder", 2760 av_default_item_name, 2761 mpeg4_options, 2762 LIBAVUTIL_VERSION_INT, 2763}; 2764 2765AVCodec ff_mpeg4_decoder = { 2766 .name = "mpeg4", 2767 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"), 2768 .type = AVMEDIA_TYPE_VIDEO, 2769 .id = AV_CODEC_ID_MPEG4, 2770 .priv_data_size = sizeof(Mpeg4DecContext), 2771 .init = decode_init, 2772 .close = ff_h263_decode_end, 2773 .decode = ff_h263_decode_frame, 2774 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | 2775 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | 2776 CODEC_CAP_FRAME_THREADS, 2777 .flush = ff_mpeg_flush, 2778 .max_lowres = 3, 2779 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420, 2780 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles), 2781 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context), 2782 .priv_class = &mpeg4_class, 2783}; 2784 2785 2786#if CONFIG_MPEG4_VDPAU_DECODER 2787AVCodec ff_mpeg4_vdpau_decoder = { 2788 .name = "mpeg4_vdpau", 2789 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"), 2790 .type = AVMEDIA_TYPE_VIDEO, 2791 .id = AV_CODEC_ID_MPEG4, 2792 .priv_data_size = sizeof(MpegEncContext), 2793 .init = decode_init, 2794 .close = ff_h263_decode_end, 2795 .decode = ff_h263_decode_frame, 2796 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | 2797 CODEC_CAP_HWACCEL_VDPAU, 2798 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4, 2799 AV_PIX_FMT_NONE }, 2800 .priv_class = &mpeg4_vdpau_class, 2801}; 2802#endif 2803