1/* 2 * H.263 decoder 3 * Copyright (c) 2001 Fabrice Bellard 4 * Copyright (c) 2002-2004 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/** 24 * @file 25 * H.263 decoder. 26 */ 27 28#define UNCHECKED_BITSTREAM_READER 1 29 30#include "config_components.h" 31 32#include "avcodec.h" 33#include "codec_internal.h" 34#include "error_resilience.h" 35#include "flvdec.h" 36#include "h263.h" 37#include "h263dec.h" 38#if FF_API_FLAG_TRUNCATED 39#include "h263_parser.h" 40#endif 41#include "hwconfig.h" 42#include "internal.h" 43#include "mpeg_er.h" 44#include "mpeg4video.h" 45#include "mpeg4videodec.h" 46#if FF_API_FLAG_TRUNCATED 47#include "mpeg4video_parser.h" 48#endif 49#include "mpegutils.h" 50#include "mpegvideo.h" 51#include "mpegvideodec.h" 52#include "msmpeg4dec.h" 53#include "qpeldsp.h" 54#include "thread.h" 55#include "wmv2dec.h" 56 57static enum AVPixelFormat h263_get_format(AVCodecContext *avctx) 58{ 59 /* MPEG-4 Studio Profile only, not supported by hardware */ 60 if (avctx->bits_per_raw_sample > 8) { 61 av_assert1(((MpegEncContext *)avctx->priv_data)->studio_profile); 62 return avctx->pix_fmt; 63 } 64 65 if (avctx->codec->id == AV_CODEC_ID_MSS2) 66 return AV_PIX_FMT_YUV420P; 67 68 if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) { 69 if (avctx->color_range == AVCOL_RANGE_UNSPECIFIED) 70 avctx->color_range = AVCOL_RANGE_MPEG; 71 return AV_PIX_FMT_GRAY8; 72 } 73 74 return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts); 75} 76 77av_cold int ff_h263_decode_init(AVCodecContext *avctx) 78{ 79 MpegEncContext *s = avctx->priv_data; 80 int ret; 81 82 s->out_format = FMT_H263; 83 84 // set defaults 85 ff_mpv_decode_init(s, avctx); 86 87 s->quant_precision = 5; 88 s->decode_mb = ff_h263_decode_mb; 89 s->low_delay = 1; 90 91 /* select sub codec */ 92 switch (avctx->codec->id) { 93 case AV_CODEC_ID_H263: 94 case AV_CODEC_ID_H263P: 95 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; 96 break; 97 case AV_CODEC_ID_MPEG4: 98 break; 99 case AV_CODEC_ID_MSMPEG4V1: 100 s->h263_pred = 1; 101 s->msmpeg4_version = 1; 102 break; 103 case AV_CODEC_ID_MSMPEG4V2: 104 s->h263_pred = 1; 105 s->msmpeg4_version = 2; 106 break; 107 case AV_CODEC_ID_MSMPEG4V3: 108 s->h263_pred = 1; 109 s->msmpeg4_version = 3; 110 break; 111 case AV_CODEC_ID_WMV1: 112 s->h263_pred = 1; 113 s->msmpeg4_version = 4; 114 break; 115 case AV_CODEC_ID_WMV2: 116 s->h263_pred = 1; 117 s->msmpeg4_version = 5; 118 break; 119 case AV_CODEC_ID_VC1: 120 case AV_CODEC_ID_WMV3: 121 case AV_CODEC_ID_VC1IMAGE: 122 case AV_CODEC_ID_WMV3IMAGE: 123 case AV_CODEC_ID_MSS2: 124 s->h263_pred = 1; 125 s->msmpeg4_version = 6; 126 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; 127 break; 128 case AV_CODEC_ID_H263I: 129 break; 130 case AV_CODEC_ID_FLV1: 131 s->h263_flv = 1; 132 break; 133 default: 134 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n", 135 avctx->codec->id); 136 return AVERROR(ENOSYS); 137 } 138 139 if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263")) 140 if (avctx->extradata_size == 56 && avctx->extradata[0] == 1) 141 s->ehc_mode = 1; 142 143 /* for H.263, we allocate the images after having read the header */ 144 if (avctx->codec->id != AV_CODEC_ID_H263 && 145 avctx->codec->id != AV_CODEC_ID_H263P && 146 avctx->codec->id != AV_CODEC_ID_MPEG4) { 147 avctx->pix_fmt = h263_get_format(avctx); 148 ff_mpv_idct_init(s); 149 if ((ret = ff_mpv_common_init(s)) < 0) 150 return ret; 151 } 152 153 ff_h263dsp_init(&s->h263dsp); 154 ff_qpeldsp_init(&s->qdsp); 155 ff_h263_decode_init_vlc(); 156 157 return 0; 158} 159 160av_cold int ff_h263_decode_end(AVCodecContext *avctx) 161{ 162 MpegEncContext *s = avctx->priv_data; 163 164 ff_mpv_common_end(s); 165 return 0; 166} 167 168/** 169 * Return the number of bytes consumed for building the current frame. 170 */ 171static int get_consumed_bytes(MpegEncContext *s, int buf_size) 172{ 173 int pos = (get_bits_count(&s->gb) + 7) >> 3; 174 175 if (s->divx_packed || s->avctx->hwaccel) { 176 /* We would have to scan through the whole buf to handle the weird 177 * reordering ... */ 178 return buf_size; 179#if FF_API_FLAG_TRUNCATED 180 } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) { 181 pos -= s->parse_context.last_index; 182 // padding is not really read so this might be -1 183 if (pos < 0) 184 pos = 0; 185 return pos; 186#endif 187 } else { 188 // avoid infinite loops (maybe not needed...) 189 if (pos == 0) 190 pos = 1; 191 // oops ;) 192 if (pos + 10 > buf_size) 193 pos = buf_size; 194 195 return pos; 196 } 197} 198 199static int decode_slice(MpegEncContext *s) 200{ 201 const int part_mask = s->partitioned_frame 202 ? (ER_AC_END | ER_AC_ERROR) : 0x7F; 203 const int mb_size = 16 >> s->avctx->lowres; 204 int ret; 205 206 s->last_resync_gb = s->gb; 207 s->first_slice_line = 1; 208 s->resync_mb_x = s->mb_x; 209 s->resync_mb_y = s->mb_y; 210 211 ff_set_qscale(s, s->qscale); 212 213 if (s->studio_profile) { 214 if ((ret = ff_mpeg4_decode_studio_slice_header(s->avctx->priv_data)) < 0) 215 return ret; 216 } 217 218 if (s->avctx->hwaccel) { 219 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8; 220 ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start); 221 // ensure we exit decode loop 222 s->mb_y = s->mb_height; 223 return ret; 224 } 225 226 if (s->partitioned_frame) { 227 const int qscale = s->qscale; 228 229 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) 230 if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0) 231 return ret; 232 233 /* restore variables which were modified */ 234 s->first_slice_line = 1; 235 s->mb_x = s->resync_mb_x; 236 s->mb_y = s->resync_mb_y; 237 ff_set_qscale(s, qscale); 238 } 239 240 for (; s->mb_y < s->mb_height; s->mb_y++) { 241 /* per-row end of slice checks */ 242 if (s->msmpeg4_version) { 243 if (s->resync_mb_y + s->slice_height == s->mb_y) { 244 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 245 s->mb_x - 1, s->mb_y, ER_MB_END); 246 247 return 0; 248 } 249 } 250 251 if (s->msmpeg4_version == 1) { 252 s->last_dc[0] = 253 s->last_dc[1] = 254 s->last_dc[2] = 128; 255 } 256 257 ff_init_block_index(s); 258 for (; s->mb_x < s->mb_width; s->mb_x++) { 259 int ret; 260 261 ff_update_block_index(s); 262 263 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y) 264 s->first_slice_line = 0; 265 266 /* DCT & quantize */ 267 268 s->mv_dir = MV_DIR_FORWARD; 269 s->mv_type = MV_TYPE_16X16; 270 ff_dlog(s, "%d %06X\n", 271 get_bits_count(&s->gb), show_bits(&s->gb, 24)); 272 273 ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y); 274 ret = s->decode_mb(s, s->block); 275 276 if (s->pict_type != AV_PICTURE_TYPE_B) 277 ff_h263_update_motion_val(s); 278 279 if (ret < 0) { 280 const int xy = s->mb_x + s->mb_y * s->mb_stride; 281 if (ret == SLICE_END) { 282 ff_mpv_reconstruct_mb(s, s->block); 283 if (s->loop_filter) 284 ff_h263_loop_filter(s); 285 286 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 287 s->mb_x, s->mb_y, ER_MB_END & part_mask); 288 289 s->padding_bug_score--; 290 291 if (++s->mb_x >= s->mb_width) { 292 s->mb_x = 0; 293 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size); 294 ff_mpv_report_decode_progress(s); 295 s->mb_y++; 296 } 297 return 0; 298 } else if (ret == SLICE_NOEND) { 299 av_log(s->avctx, AV_LOG_ERROR, 300 "Slice mismatch at MB: %d\n", xy); 301 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 302 s->mb_x + 1, s->mb_y, 303 ER_MB_END & part_mask); 304 return AVERROR_INVALIDDATA; 305 } 306 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy); 307 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 308 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask); 309 310 if ((s->avctx->err_recognition & AV_EF_IGNORE_ERR) && get_bits_left(&s->gb) > 0) 311 continue; 312 return AVERROR_INVALIDDATA; 313 } 314 315 ff_mpv_reconstruct_mb(s, s->block); 316 if (s->loop_filter) 317 ff_h263_loop_filter(s); 318 } 319 320 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size); 321 ff_mpv_report_decode_progress(s); 322 323 s->mb_x = 0; 324 } 325 326 av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height); 327 328 // Detect incorrect padding with wrong stuffing codes used by NEC N-02B 329 if (s->codec_id == AV_CODEC_ID_MPEG4 && 330 (s->workaround_bugs & FF_BUG_AUTODETECT) && 331 get_bits_left(&s->gb) >= 48 && 332 show_bits(&s->gb, 24) == 0x4010 && 333 !s->data_partitioning) 334 s->padding_bug_score += 32; 335 336 /* try to detect the padding bug */ 337 if (s->codec_id == AV_CODEC_ID_MPEG4 && 338 (s->workaround_bugs & FF_BUG_AUTODETECT) && 339 get_bits_left(&s->gb) >= 0 && 340 get_bits_left(&s->gb) < 137 && 341 !s->data_partitioning) { 342 const int bits_count = get_bits_count(&s->gb); 343 const int bits_left = s->gb.size_in_bits - bits_count; 344 345 if (bits_left == 0) { 346 s->padding_bug_score += 16; 347 } else if (bits_left != 1) { 348 int v = show_bits(&s->gb, 8); 349 v |= 0x7F >> (7 - (bits_count & 7)); 350 351 if (v == 0x7F && bits_left <= 8) 352 s->padding_bug_score--; 353 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) && 354 bits_left <= 16) 355 s->padding_bug_score += 4; 356 else 357 s->padding_bug_score++; 358 } 359 } 360 361 if (s->codec_id == AV_CODEC_ID_H263 && 362 (s->workaround_bugs & FF_BUG_AUTODETECT) && 363 get_bits_left(&s->gb) >= 8 && 364 get_bits_left(&s->gb) < 300 && 365 s->pict_type == AV_PICTURE_TYPE_I && 366 show_bits(&s->gb, 8) == 0 && 367 !s->data_partitioning) { 368 369 s->padding_bug_score += 32; 370 } 371 372 if (s->codec_id == AV_CODEC_ID_H263 && 373 (s->workaround_bugs & FF_BUG_AUTODETECT) && 374 get_bits_left(&s->gb) >= 64 && 375 AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) { 376 377 s->padding_bug_score += 32; 378 } 379 380 if (s->workaround_bugs & FF_BUG_AUTODETECT) { 381 if ( 382 (s->padding_bug_score > -2 && !s->data_partitioning)) 383 s->workaround_bugs |= FF_BUG_NO_PADDING; 384 else 385 s->workaround_bugs &= ~FF_BUG_NO_PADDING; 386 } 387 388 // handle formats which don't have unique end markers 389 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly 390 int left = get_bits_left(&s->gb); 391 int max_extra = 7; 392 393 /* no markers in M$ crap */ 394 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I) 395 max_extra += 17; 396 397 /* buggy padding but the frame should still end approximately at 398 * the bitstream end */ 399 if ((s->workaround_bugs & FF_BUG_NO_PADDING) && 400 (s->avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE))) 401 max_extra += 48; 402 else if ((s->workaround_bugs & FF_BUG_NO_PADDING)) 403 max_extra += 256 * 256 * 256 * 64; 404 405 if (left > max_extra) 406 av_log(s->avctx, AV_LOG_ERROR, 407 "discarding %d junk bits at end, next would be %X\n", 408 left, show_bits(&s->gb, 24)); 409 else if (left < 0) 410 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left); 411 else 412 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, 413 s->mb_x - 1, s->mb_y, ER_MB_END); 414 415 return 0; 416 } 417 418 av_log(s->avctx, AV_LOG_ERROR, 419 "slice end not reached but screenspace end (%d left %06X, score= %d)\n", 420 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score); 421 422 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, 423 ER_MB_END & part_mask); 424 425 return AVERROR_INVALIDDATA; 426} 427 428int ff_h263_decode_frame(AVCodecContext *avctx, AVFrame *pict, 429 int *got_frame, AVPacket *avpkt) 430{ 431 const uint8_t *buf = avpkt->data; 432 int buf_size = avpkt->size; 433 MpegEncContext *s = avctx->priv_data; 434 int ret; 435 int slice_ret = 0; 436 437 /* no supplementary picture */ 438 if (buf_size == 0) { 439 /* special case for last picture */ 440 if (s->low_delay == 0 && s->next_picture_ptr) { 441 if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0) 442 return ret; 443 s->next_picture_ptr = NULL; 444 445 *got_frame = 1; 446 } 447 448 return 0; 449 } 450 451#if FF_API_FLAG_TRUNCATED 452 if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) { 453 int next; 454 455 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) { 456 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size); 457 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) { 458 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size); 459 } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) { 460 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size); 461 } else { 462 av_log(s->avctx, AV_LOG_ERROR, 463 "this codec does not support truncated bitstreams\n"); 464 return AVERROR(ENOSYS); 465 } 466 467 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, 468 &buf_size) < 0) 469 return buf_size; 470 } 471#endif 472 473retry: 474 if (s->divx_packed && s->bitstream_buffer_size) { 475 int i; 476 for(i=0; i < buf_size-3; i++) { 477 if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) { 478 if (buf[i+3]==0xB0) { 479 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n"); 480 s->bitstream_buffer_size = 0; 481 } 482 break; 483 } 484 } 485 } 486 487 if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder 488 ret = init_get_bits8(&s->gb, s->bitstream_buffer, 489 s->bitstream_buffer_size); 490 else 491 ret = init_get_bits8(&s->gb, buf, buf_size); 492 493 s->bitstream_buffer_size = 0; 494 if (ret < 0) 495 return ret; 496 497 if (!s->context_initialized) 498 // we need the idct permutation for reading a custom matrix 499 ff_mpv_idct_init(s); 500 501 /* let's go :-) */ 502 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) { 503 ret = ff_wmv2_decode_picture_header(s); 504 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) { 505 ret = ff_msmpeg4_decode_picture_header(s); 506 } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) { 507 if (s->avctx->extradata_size && s->picture_number == 0) { 508 GetBitContext gb; 509 510 if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 ) 511 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb, 1, 0); 512 } 513 ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb, 0, 0); 514 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) { 515 ret = ff_intel_h263_decode_picture_header(s); 516 } else if (CONFIG_FLV_DECODER && s->h263_flv) { 517 ret = ff_flv_decode_picture_header(s); 518 } else { 519 ret = ff_h263_decode_picture_header(s); 520 } 521 522 if (ret < 0 || ret == FRAME_SKIPPED) { 523 if ( s->width != avctx->coded_width 524 || s->height != avctx->coded_height) { 525 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n"); 526 s->width = avctx->coded_width; 527 s->height= avctx->coded_height; 528 } 529 } 530 if (ret == FRAME_SKIPPED) 531 return get_consumed_bytes(s, buf_size); 532 533 /* skip if the header was thrashed */ 534 if (ret < 0) { 535 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n"); 536 return ret; 537 } 538 539 if (!s->context_initialized) { 540 avctx->pix_fmt = h263_get_format(avctx); 541 if ((ret = ff_mpv_common_init(s)) < 0) 542 return ret; 543 } 544 545 if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) { 546 int i = ff_find_unused_picture(s->avctx, s->picture, 0); 547 if (i < 0) 548 return i; 549 s->current_picture_ptr = &s->picture[i]; 550 } 551 552 avctx->has_b_frames = !s->low_delay; 553 554 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) { 555 if (s->pict_type != AV_PICTURE_TYPE_B && s->mb_num/2 > get_bits_left(&s->gb)) 556 return AVERROR_INVALIDDATA; 557 if (ff_mpeg4_workaround_bugs(avctx) == 1) 558 goto retry; 559 if (s->studio_profile != (s->idsp.idct == NULL)) 560 ff_mpv_idct_init(s); 561 } 562 563 /* After H.263 & MPEG-4 header decode we have the height, width, 564 * and other parameters. So then we could init the picture. 565 * FIXME: By the way H.263 decoder is evolving it should have 566 * an H263EncContext */ 567 if (s->width != avctx->coded_width || 568 s->height != avctx->coded_height || 569 s->context_reinit) { 570 /* H.263 could change picture size any time */ 571 s->context_reinit = 0; 572 573 ret = ff_set_dimensions(avctx, s->width, s->height); 574 if (ret < 0) 575 return ret; 576 577 ff_set_sar(avctx, avctx->sample_aspect_ratio); 578 579 if ((ret = ff_mpv_common_frame_size_change(s))) 580 return ret; 581 582 if (avctx->pix_fmt != h263_get_format(avctx)) { 583 av_log(avctx, AV_LOG_ERROR, "format change not supported\n"); 584 avctx->pix_fmt = AV_PIX_FMT_NONE; 585 return AVERROR_UNKNOWN; 586 } 587 } 588 589 if (s->codec_id == AV_CODEC_ID_H263 || 590 s->codec_id == AV_CODEC_ID_H263P || 591 s->codec_id == AV_CODEC_ID_H263I) 592 s->gob_index = H263_GOB_HEIGHT(s->height); 593 594 // for skipping the frame 595 s->current_picture.f->pict_type = s->pict_type; 596 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I; 597 598 /* skip B-frames if we don't have reference frames */ 599 if (!s->last_picture_ptr && 600 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) 601 return get_consumed_bytes(s, buf_size); 602 if ((avctx->skip_frame >= AVDISCARD_NONREF && 603 s->pict_type == AV_PICTURE_TYPE_B) || 604 (avctx->skip_frame >= AVDISCARD_NONKEY && 605 s->pict_type != AV_PICTURE_TYPE_I) || 606 avctx->skip_frame >= AVDISCARD_ALL) 607 return get_consumed_bytes(s, buf_size); 608 609 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) { 610 s->me.qpel_put = s->qdsp.put_qpel_pixels_tab; 611 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab; 612 } else { 613 s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab; 614 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab; 615 } 616 617 if ((ret = ff_mpv_frame_start(s, avctx)) < 0) 618 return ret; 619 620 if (!s->divx_packed && !avctx->hwaccel) 621 ff_thread_finish_setup(avctx); 622 623 if (avctx->hwaccel) { 624 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, 625 s->gb.buffer_end - s->gb.buffer); 626 if (ret < 0 ) 627 return ret; 628 } 629 630 ff_mpeg_er_frame_start(s); 631 632 /* the second part of the wmv2 header contains the MB skip bits which 633 * are stored in current_picture->mb_type which is not available before 634 * ff_mpv_frame_start() */ 635 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) { 636 ret = ff_wmv2_decode_secondary_picture_header(s); 637 if (ret < 0) 638 return ret; 639 if (ret == 1) 640 goto frame_end; 641 } 642 643 /* decode each macroblock */ 644 s->mb_x = 0; 645 s->mb_y = 0; 646 647 slice_ret = decode_slice(s); 648 while (s->mb_y < s->mb_height) { 649 if (s->msmpeg4_version) { 650 if (s->slice_height == 0 || s->mb_x != 0 || slice_ret < 0 || 651 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0) 652 break; 653 } else { 654 int prev_x = s->mb_x, prev_y = s->mb_y; 655 if (ff_h263_resync(s) < 0) 656 break; 657 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x) 658 s->er.error_occurred = 1; 659 } 660 661 if (s->msmpeg4_version < 4 && s->h263_pred) 662 ff_mpeg4_clean_buffers(s); 663 664 if (decode_slice(s) < 0) 665 slice_ret = AVERROR_INVALIDDATA; 666 } 667 668 if (s->msmpeg4_version && s->msmpeg4_version < 4 && 669 s->pict_type == AV_PICTURE_TYPE_I) 670 if (!CONFIG_MSMPEG4_DECODER || 671 ff_msmpeg4_decode_ext_header(s, buf_size) < 0) 672 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR; 673 674 av_assert1(s->bitstream_buffer_size == 0); 675frame_end: 676 if (!s->studio_profile) 677 ff_er_frame_end(&s->er); 678 679 if (avctx->hwaccel) { 680 ret = avctx->hwaccel->end_frame(avctx); 681 if (ret < 0) 682 return ret; 683 } 684 685 ff_mpv_frame_end(s); 686 687 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) 688 ff_mpeg4_frame_end(avctx, buf, buf_size); 689 690 if (!s->divx_packed && avctx->hwaccel) 691 ff_thread_finish_setup(avctx); 692 693 av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type); 694 av_assert1(s->current_picture.f->pict_type == s->pict_type); 695 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) { 696 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0) 697 return ret; 698 ff_print_debug_info(s, s->current_picture_ptr, pict); 699 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1); 700 } else if (s->last_picture_ptr) { 701 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0) 702 return ret; 703 ff_print_debug_info(s, s->last_picture_ptr, pict); 704 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1); 705 } 706 707 if (s->last_picture_ptr || s->low_delay) { 708 if ( pict->format == AV_PIX_FMT_YUV420P 709 && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) { 710 for (int p = 0; p < 3; p++) { 711 int h = AV_CEIL_RSHIFT(pict->height, !!p); 712 713 pict->data[p] += (h - 1) * pict->linesize[p]; 714 pict->linesize[p] *= -1; 715 } 716 } 717 *got_frame = 1; 718 } 719 720 if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) 721 return slice_ret; 722 else 723 return get_consumed_bytes(s, buf_size); 724} 725 726const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = { 727#if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL 728 AV_PIX_FMT_VAAPI, 729#endif 730#if CONFIG_MPEG4_NVDEC_HWACCEL 731 AV_PIX_FMT_CUDA, 732#endif 733#if CONFIG_MPEG4_VDPAU_HWACCEL 734 AV_PIX_FMT_VDPAU, 735#endif 736#if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL 737 AV_PIX_FMT_VIDEOTOOLBOX, 738#endif 739 AV_PIX_FMT_YUV420P, 740 AV_PIX_FMT_NONE 741}; 742 743static const AVCodecHWConfigInternal *const h263_hw_config_list[] = { 744#if CONFIG_H263_VAAPI_HWACCEL 745 HWACCEL_VAAPI(h263), 746#endif 747#if CONFIG_MPEG4_NVDEC_HWACCEL 748 HWACCEL_NVDEC(mpeg4), 749#endif 750#if CONFIG_MPEG4_VDPAU_HWACCEL 751 HWACCEL_VDPAU(mpeg4), 752#endif 753#if CONFIG_H263_VIDEOTOOLBOX_HWACCEL 754 HWACCEL_VIDEOTOOLBOX(h263), 755#endif 756 NULL 757}; 758 759const FFCodec ff_h263_decoder = { 760 .p.name = "h263", 761 .p.long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), 762 .p.type = AVMEDIA_TYPE_VIDEO, 763 .p.id = AV_CODEC_ID_H263, 764 .priv_data_size = sizeof(MpegEncContext), 765 .init = ff_h263_decode_init, 766 .close = ff_h263_decode_end, 767 FF_CODEC_DECODE_CB(ff_h263_decode_frame), 768 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | 769#if FF_API_FLAG_TRUNCATED 770 AV_CODEC_CAP_TRUNCATED | 771#endif 772 AV_CODEC_CAP_DELAY, 773 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | 774 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM, 775 .flush = ff_mpeg_flush, 776 .p.max_lowres = 3, 777 .p.pix_fmts = ff_h263_hwaccel_pixfmt_list_420, 778 .hw_configs = h263_hw_config_list, 779}; 780 781const FFCodec ff_h263p_decoder = { 782 .p.name = "h263p", 783 .p.long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), 784 .p.type = AVMEDIA_TYPE_VIDEO, 785 .p.id = AV_CODEC_ID_H263P, 786 .priv_data_size = sizeof(MpegEncContext), 787 .init = ff_h263_decode_init, 788 .close = ff_h263_decode_end, 789 FF_CODEC_DECODE_CB(ff_h263_decode_frame), 790 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | 791#if FF_API_FLAG_TRUNCATED 792 AV_CODEC_CAP_TRUNCATED | 793#endif 794 AV_CODEC_CAP_DELAY, 795 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | 796 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM, 797 .flush = ff_mpeg_flush, 798 .p.max_lowres = 3, 799 .p.pix_fmts = ff_h263_hwaccel_pixfmt_list_420, 800 .hw_configs = h263_hw_config_list, 801}; 802