1/* 2 * RV10/RV20 decoder 3 * Copyright (c) 2000,2001 Fabrice Bellard 4 * Copyright (c) 2002-2004 Michael Niedermayer 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23/** 24 * @file 25 * RV10/RV20 decoder 26 */ 27 28#include <inttypes.h> 29 30#include "libavutil/imgutils.h" 31#include "libavutil/thread.h" 32 33#include "avcodec.h" 34#include "codec_internal.h" 35#include "error_resilience.h" 36#include "h263.h" 37#include "h263data.h" 38#include "h263dec.h" 39#include "internal.h" 40#include "mpeg_er.h" 41#include "mpegutils.h" 42#include "mpegvideo.h" 43#include "mpegvideodec.h" 44#include "mpeg4video.h" 45#include "mpegvideodata.h" 46#include "rv10dec.h" 47 48#define RV_GET_MAJOR_VER(x) ((x) >> 28) 49#define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF) 50#define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF) 51 52#define MAX_VLC_ENTRIES 1023 // Note: Does not include the skip entries. 53#define DC_VLC_BITS 9 54 55typedef struct RVDecContext { 56 MpegEncContext m; 57 int sub_id; 58 int orig_width, orig_height; 59} RVDecContext; 60 61/* (run, length) encoded value for the symbols table. The actual symbols 62 * are run..run - length (mod 256). 63 * The last two entries in the following table apply to luma only. 64 * The skip values are not included in this list. */ 65static const uint8_t rv_sym_run_len[][2] = { 66 { 0, 0 }, { 1, 0 }, { 255, 0 }, { 3, 1 }, { 254, 1 }, 67 { 7, 3 }, { 252, 3 }, { 15, 7 }, { 248, 7 }, { 31, 15 }, 68 { 240, 15 }, { 63, 31 }, { 224, 31 }, { 127, 63 }, { 192, 63 }, 69 { 255, 127 }, { 128, 127 }, { 127, 255 }, { 128, 255 }, 70}; 71 72/* entry[i] of the following tables gives 73 * the number of VLC codes of length i + 2. */ 74static const uint16_t rv_lum_len_count[15] = { 75 1, 0, 2, 4, 8, 16, 32, 0, 64, 0, 128, 0, 256, 0, 512, 76}; 77 78static const uint16_t rv_chrom_len_count[15] = { 79 1, 2, 4, 0, 8, 0, 16, 0, 32, 0, 64, 0, 128, 0, 256, 80}; 81 82static VLC rv_dc_lum, rv_dc_chrom; 83 84int ff_rv_decode_dc(MpegEncContext *s, int n) 85{ 86 int code; 87 88 if (n < 4) { 89 code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2); 90 } else { 91 code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2); 92 if (code < 0) { 93 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n"); 94 return -1; 95 } 96 } 97 return code; 98} 99 100/* read RV 1.0 compatible frame header */ 101static int rv10_decode_picture_header(MpegEncContext *s) 102{ 103 int mb_count, pb_frame, marker, mb_xy; 104 105 marker = get_bits1(&s->gb); 106 107 if (get_bits1(&s->gb)) 108 s->pict_type = AV_PICTURE_TYPE_P; 109 else 110 s->pict_type = AV_PICTURE_TYPE_I; 111 112 if (!marker) 113 av_log(s->avctx, AV_LOG_ERROR, "marker missing\n"); 114 115 pb_frame = get_bits1(&s->gb); 116 117 ff_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame); 118 119 if (pb_frame) { 120 avpriv_request_sample(s->avctx, "PB-frame"); 121 return AVERROR_PATCHWELCOME; 122 } 123 124 s->qscale = get_bits(&s->gb, 5); 125 if (s->qscale == 0) { 126 av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n"); 127 return AVERROR_INVALIDDATA; 128 } 129 130 if (s->pict_type == AV_PICTURE_TYPE_I) { 131 if (s->rv10_version == 3) { 132 /* specific MPEG like DC coding not used */ 133 s->last_dc[0] = get_bits(&s->gb, 8); 134 s->last_dc[1] = get_bits(&s->gb, 8); 135 s->last_dc[2] = get_bits(&s->gb, 8); 136 ff_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0], 137 s->last_dc[1], s->last_dc[2]); 138 } 139 } 140 /* if multiple packets per frame are sent, the position at which 141 * to display the macroblocks is coded here */ 142 143 mb_xy = s->mb_x + s->mb_y * s->mb_width; 144 if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) { 145 s->mb_x = get_bits(&s->gb, 6); /* mb_x */ 146 s->mb_y = get_bits(&s->gb, 6); /* mb_y */ 147 mb_count = get_bits(&s->gb, 12); 148 } else { 149 s->mb_x = 0; 150 s->mb_y = 0; 151 mb_count = s->mb_width * s->mb_height; 152 } 153 skip_bits(&s->gb, 3); /* ignored */ 154 s->f_code = 1; 155 156 return mb_count; 157} 158 159static int rv20_decode_picture_header(RVDecContext *rv, int whole_size) 160{ 161 MpegEncContext *s = &rv->m; 162 int seq, mb_pos, i, ret; 163 int rpr_max; 164 165 i = get_bits(&s->gb, 2); 166 switch (i) { 167 case 0: 168 s->pict_type = AV_PICTURE_TYPE_I; 169 break; 170 case 1: 171 s->pict_type = AV_PICTURE_TYPE_I; 172 break; // hmm ... 173 case 2: 174 s->pict_type = AV_PICTURE_TYPE_P; 175 break; 176 case 3: 177 s->pict_type = AV_PICTURE_TYPE_B; 178 break; 179 default: 180 av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n"); 181 return AVERROR_INVALIDDATA; 182 } 183 184 if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) { 185 av_log(s->avctx, AV_LOG_ERROR, "low delay B\n"); 186 return -1; 187 } 188 if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) { 189 av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n"); 190 return AVERROR_INVALIDDATA; 191 } 192 193 if (get_bits1(&s->gb)) { 194 av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n"); 195 return AVERROR_INVALIDDATA; 196 } 197 198 s->qscale = get_bits(&s->gb, 5); 199 if (s->qscale == 0) { 200 av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n"); 201 return AVERROR_INVALIDDATA; 202 } 203 204 if (RV_GET_MINOR_VER(rv->sub_id) >= 2) 205 s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres; 206 207 if (RV_GET_MINOR_VER(rv->sub_id) <= 1) 208 seq = get_bits(&s->gb, 8) << 7; 209 else 210 seq = get_bits(&s->gb, 13) << 2; 211 212 rpr_max = s->avctx->extradata[1] & 7; 213 if (rpr_max) { 214 int f, new_w, new_h; 215 int rpr_bits = av_log2(rpr_max) + 1; 216 217 f = get_bits(&s->gb, rpr_bits); 218 219 if (f) { 220 if (s->avctx->extradata_size < 8 + 2 * f) { 221 av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n"); 222 return AVERROR_INVALIDDATA; 223 } 224 225 new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f]; 226 new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f]; 227 } else { 228 new_w = rv->orig_width; 229 new_h = rv->orig_height; 230 } 231 if (new_w != s->width || new_h != s->height || !s->context_initialized) { 232 AVRational old_aspect = s->avctx->sample_aspect_ratio; 233 av_log(s->avctx, AV_LOG_DEBUG, 234 "attempting to change resolution to %dx%d\n", new_w, new_h); 235 if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0) 236 return AVERROR_INVALIDDATA; 237 238 if (whole_size < (new_w + 15)/16 * ((new_h + 15)/16) / 8) 239 return AVERROR_INVALIDDATA; 240 241 ff_mpv_common_end(s); 242 243 // attempt to keep aspect during typical resolution switches 244 if (!old_aspect.num) 245 old_aspect = (AVRational){1, 1}; 246 if (2 * (int64_t)new_w * s->height == (int64_t)new_h * s->width) 247 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1}); 248 if ((int64_t)new_w * s->height == 2 * (int64_t)new_h * s->width) 249 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2}); 250 251 ret = ff_set_dimensions(s->avctx, new_w, new_h); 252 if (ret < 0) 253 return ret; 254 255 s->width = new_w; 256 s->height = new_h; 257 if ((ret = ff_mpv_common_init(s)) < 0) 258 return ret; 259 } 260 261 if (s->avctx->debug & FF_DEBUG_PICT_INFO) { 262 av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max); 263 } 264 } 265 if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0) 266 return AVERROR_INVALIDDATA; 267 268 mb_pos = ff_h263_decode_mba(s); 269 270 seq |= s->time & ~0x7FFF; 271 if (seq - s->time > 0x4000) 272 seq -= 0x8000; 273 if (seq - s->time < -0x4000) 274 seq += 0x8000; 275 276 if (seq != s->time) { 277 if (s->pict_type != AV_PICTURE_TYPE_B) { 278 s->time = seq; 279 s->pp_time = s->time - s->last_non_b_time; 280 s->last_non_b_time = s->time; 281 } else { 282 s->time = seq; 283 s->pb_time = s->pp_time - (s->last_non_b_time - s->time); 284 } 285 } 286 if (s->pict_type == AV_PICTURE_TYPE_B) { 287 if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) { 288 av_log(s->avctx, AV_LOG_DEBUG, 289 "messed up order, possible from seeking? skipping current B-frame\n"); 290#define ERROR_SKIP_FRAME -123 291 return ERROR_SKIP_FRAME; 292 } 293 ff_mpeg4_init_direct_mv(s); 294 } 295 296 s->no_rounding = get_bits1(&s->gb); 297 298 if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B) 299 // binary decoder reads 3+2 bits here but they don't seem to be used 300 skip_bits(&s->gb, 5); 301 302 s->f_code = 1; 303 s->h263_aic = s->pict_type == AV_PICTURE_TYPE_I; 304 s->modified_quant = 1; 305 if (!s->avctx->lowres) 306 s->loop_filter = 1; 307 308 if (s->avctx->debug & FF_DEBUG_PICT_INFO) { 309 av_log(s->avctx, AV_LOG_INFO, 310 "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n", 311 seq, s->mb_x, s->mb_y, s->pict_type, s->qscale, 312 s->no_rounding); 313 } 314 315 av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay); 316 317 return s->mb_width * s->mb_height - mb_pos; 318} 319 320static av_cold void rv10_build_vlc(VLC *vlc, const uint16_t len_count[15], 321 const uint8_t sym_rl[][2], int sym_rl_elems) 322{ 323 uint16_t syms[MAX_VLC_ENTRIES]; 324 uint8_t lens[MAX_VLC_ENTRIES]; 325 unsigned nb_syms = 0, nb_lens = 0; 326 327 for (unsigned i = 0; i < sym_rl_elems; i++) { 328 unsigned cur_sym = sym_rl[i][0]; 329 for (unsigned tmp = nb_syms + sym_rl[i][1]; nb_syms <= tmp; nb_syms++) 330 syms[nb_syms] = 0xFF & cur_sym--; 331 } 332 333 for (unsigned i = 0; i < 15; i++) 334 for (unsigned tmp = nb_lens + len_count[i]; nb_lens < tmp; nb_lens++) 335 lens[nb_lens] = i + 2; 336 av_assert1(nb_lens == nb_syms); 337 ff_init_vlc_from_lengths(vlc, DC_VLC_BITS, nb_lens, lens, 1, 338 syms, 2, 2, 0, INIT_VLC_STATIC_OVERLONG, NULL); 339} 340 341static av_cold void rv10_init_static(void) 342{ 343 static VLCElem table[1472 + 992]; 344 345 rv_dc_lum.table = table; 346 rv_dc_lum.table_allocated = 1472; 347 rv10_build_vlc(&rv_dc_lum, rv_lum_len_count, 348 rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len)); 349 for (int i = 0; i < 1 << (DC_VLC_BITS - 7 /* Length of skip prefix */); i++) { 350 /* All codes beginning with 0x7F have the same length and value. 351 * Modifying the table directly saves us the useless subtables. */ 352 rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i].sym = 255; 353 rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i].len = 18; 354 } 355 rv_dc_chrom.table = &table[1472]; 356 rv_dc_chrom.table_allocated = 992; 357 rv10_build_vlc(&rv_dc_chrom, rv_chrom_len_count, 358 rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len) - 2); 359 for (int i = 0; i < 1 << (DC_VLC_BITS - 9 /* Length of skip prefix */); i++) { 360 /* Same as above. */ 361 rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i].sym = 255; 362 rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i].len = 18; 363 } 364 ff_h263_decode_init_vlc(); 365} 366 367static av_cold int rv10_decode_init(AVCodecContext *avctx) 368{ 369 static AVOnce init_static_once = AV_ONCE_INIT; 370 RVDecContext *rv = avctx->priv_data; 371 MpegEncContext *s = &rv->m; 372 int major_ver, minor_ver, micro_ver, ret; 373 374 if (avctx->extradata_size < 8) { 375 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n"); 376 return AVERROR_INVALIDDATA; 377 } 378 if ((ret = av_image_check_size(avctx->coded_width, 379 avctx->coded_height, 0, avctx)) < 0) 380 return ret; 381 382 ff_mpv_decode_init(s, avctx); 383 384 s->out_format = FMT_H263; 385 386 rv->orig_width = 387 s->width = avctx->coded_width; 388 rv->orig_height = 389 s->height = avctx->coded_height; 390 391 s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1; 392 rv->sub_id = AV_RB32((uint8_t *) avctx->extradata + 4); 393 394 major_ver = RV_GET_MAJOR_VER(rv->sub_id); 395 minor_ver = RV_GET_MINOR_VER(rv->sub_id); 396 micro_ver = RV_GET_MICRO_VER(rv->sub_id); 397 398 s->low_delay = 1; 399 switch (major_ver) { 400 case 1: 401 s->rv10_version = micro_ver ? 3 : 1; 402 s->obmc = micro_ver == 2; 403 break; 404 case 2: 405 if (minor_ver >= 2) { 406 s->low_delay = 0; 407 s->avctx->has_b_frames = 1; 408 } 409 break; 410 default: 411 av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id); 412 avpriv_request_sample(avctx, "RV1/2 version"); 413 return AVERROR_PATCHWELCOME; 414 } 415 416 if (avctx->debug & FF_DEBUG_PICT_INFO) { 417 av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id, 418 ((uint32_t *) avctx->extradata)[0]); 419 } 420 421 avctx->pix_fmt = AV_PIX_FMT_YUV420P; 422 423 ff_mpv_idct_init(s); 424 if ((ret = ff_mpv_common_init(s)) < 0) 425 return ret; 426 427 ff_h263dsp_init(&s->h263dsp); 428 429 /* init static VLCs */ 430 ff_thread_once(&init_static_once, rv10_init_static); 431 432 return 0; 433} 434 435static av_cold int rv10_decode_end(AVCodecContext *avctx) 436{ 437 MpegEncContext *s = avctx->priv_data; 438 439 ff_mpv_common_end(s); 440 return 0; 441} 442 443static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf, 444 int buf_size, int buf_size2, int whole_size) 445{ 446 RVDecContext *rv = avctx->priv_data; 447 MpegEncContext *s = &rv->m; 448 int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret; 449 450 active_bits_size = buf_size * 8; 451 init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8); 452 if (s->codec_id == AV_CODEC_ID_RV10) 453 mb_count = rv10_decode_picture_header(s); 454 else 455 mb_count = rv20_decode_picture_header(rv, whole_size); 456 if (mb_count < 0) { 457 if (mb_count != ERROR_SKIP_FRAME) 458 av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n"); 459 return AVERROR_INVALIDDATA; 460 } 461 462 if (s->mb_x >= s->mb_width || 463 s->mb_y >= s->mb_height) { 464 av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y); 465 return AVERROR_INVALIDDATA; 466 } 467 mb_pos = s->mb_y * s->mb_width + s->mb_x; 468 left = s->mb_width * s->mb_height - mb_pos; 469 if (mb_count > left) { 470 av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n"); 471 return AVERROR_INVALIDDATA; 472 } 473 474 if (whole_size < s->mb_width * s->mb_height / 8) 475 return AVERROR_INVALIDDATA; 476 477 if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) { 478 // FIXME write parser so we always have complete frames? 479 if (s->current_picture_ptr) { 480 ff_er_frame_end(&s->er); 481 ff_mpv_frame_end(s); 482 s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0; 483 } 484 if ((ret = ff_mpv_frame_start(s, avctx)) < 0) 485 return ret; 486 ff_mpeg_er_frame_start(s); 487 } else { 488 if (s->current_picture_ptr->f->pict_type != s->pict_type) { 489 av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n"); 490 return AVERROR_INVALIDDATA; 491 } 492 } 493 494 495 ff_dlog(avctx, "qscale=%d\n", s->qscale); 496 497 /* default quantization values */ 498 if (s->codec_id == AV_CODEC_ID_RV10) { 499 if (s->mb_y == 0) 500 s->first_slice_line = 1; 501 } else { 502 s->first_slice_line = 1; 503 s->resync_mb_x = s->mb_x; 504 } 505 start_mb_x = s->mb_x; 506 s->resync_mb_y = s->mb_y; 507 if (s->h263_aic) { 508 s->y_dc_scale_table = 509 s->c_dc_scale_table = ff_aic_dc_scale_table; 510 } else { 511 s->y_dc_scale_table = 512 s->c_dc_scale_table = ff_mpeg1_dc_scale_table; 513 } 514 515 if (s->modified_quant) 516 s->chroma_qscale_table = ff_h263_chroma_qscale_table; 517 518 ff_set_qscale(s, s->qscale); 519 520 s->rv10_first_dc_coded[0] = 0; 521 s->rv10_first_dc_coded[1] = 0; 522 s->rv10_first_dc_coded[2] = 0; 523 s->block_wrap[0] = 524 s->block_wrap[1] = 525 s->block_wrap[2] = 526 s->block_wrap[3] = s->b8_stride; 527 s->block_wrap[4] = 528 s->block_wrap[5] = s->mb_stride; 529 ff_init_block_index(s); 530 531 /* decode each macroblock */ 532 for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) { 533 int ret; 534 ff_update_block_index(s); 535 ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y); 536 537 s->mv_dir = MV_DIR_FORWARD; 538 s->mv_type = MV_TYPE_16X16; 539 ret = ff_h263_decode_mb(s, s->block); 540 541 // Repeat the slice end check from ff_h263_decode_mb with our active 542 // bitstream size 543 if (ret != SLICE_ERROR && active_bits_size >= get_bits_count(&s->gb)) { 544 int v = show_bits(&s->gb, 16); 545 546 if (get_bits_count(&s->gb) + 16 > active_bits_size) 547 v >>= get_bits_count(&s->gb) + 16 - active_bits_size; 548 549 if (!v) 550 ret = SLICE_END; 551 } 552 if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) && 553 8 * buf_size2 >= get_bits_count(&s->gb)) { 554 active_bits_size = buf_size2 * 8; 555 av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n", 556 8 * buf_size, active_bits_size); 557 ret = SLICE_OK; 558 } 559 560 if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) { 561 av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x, 562 s->mb_y); 563 return AVERROR_INVALIDDATA; 564 } 565 if (s->pict_type != AV_PICTURE_TYPE_B) 566 ff_h263_update_motion_val(s); 567 ff_mpv_reconstruct_mb(s, s->block); 568 if (s->loop_filter) 569 ff_h263_loop_filter(s); 570 571 if (++s->mb_x == s->mb_width) { 572 s->mb_x = 0; 573 s->mb_y++; 574 ff_init_block_index(s); 575 } 576 if (s->mb_x == s->resync_mb_x) 577 s->first_slice_line = 0; 578 if (ret == SLICE_END) 579 break; 580 } 581 582 ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y, 583 ER_MB_END); 584 585 return active_bits_size; 586} 587 588static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n) 589{ 590 if (avctx->slice_count) 591 return avctx->slice_offset[n]; 592 else 593 return AV_RL32(buf + n * 8); 594} 595 596static int rv10_decode_frame(AVCodecContext *avctx, AVFrame *pict, 597 int *got_frame, AVPacket *avpkt) 598{ 599 const uint8_t *buf = avpkt->data; 600 int buf_size = avpkt->size; 601 MpegEncContext *s = avctx->priv_data; 602 int i, ret; 603 int slice_count; 604 const uint8_t *slices_hdr = NULL; 605 606 ff_dlog(avctx, "*****frame %d size=%d\n", avctx->frame_number, buf_size); 607 608 /* no supplementary picture */ 609 if (buf_size == 0) { 610 return 0; 611 } 612 613 if (!avctx->slice_count) { 614 slice_count = (*buf++) + 1; 615 buf_size--; 616 617 if (!slice_count || buf_size <= 8 * slice_count) { 618 av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n", 619 slice_count); 620 return AVERROR_INVALIDDATA; 621 } 622 623 slices_hdr = buf + 4; 624 buf += 8 * slice_count; 625 buf_size -= 8 * slice_count; 626 } else 627 slice_count = avctx->slice_count; 628 629 for (i = 0; i < slice_count; i++) { 630 unsigned offset = get_slice_offset(avctx, slices_hdr, i); 631 int size, size2; 632 633 if (offset >= buf_size) 634 return AVERROR_INVALIDDATA; 635 636 if (i + 1 == slice_count) 637 size = buf_size - offset; 638 else 639 size = get_slice_offset(avctx, slices_hdr, i + 1) - offset; 640 641 if (i + 2 >= slice_count) 642 size2 = buf_size - offset; 643 else 644 size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset; 645 646 if (size <= 0 || size2 <= 0 || 647 offset + FFMAX(size, size2) > buf_size) 648 return AVERROR_INVALIDDATA; 649 650 if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2, buf_size)) < 0) 651 return ret; 652 653 if (ret > 8 * size) 654 i++; 655 } 656 657 if (s->current_picture_ptr && s->mb_y >= s->mb_height) { 658 ff_er_frame_end(&s->er); 659 ff_mpv_frame_end(s); 660 661 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) { 662 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0) 663 return ret; 664 ff_print_debug_info(s, s->current_picture_ptr, pict); 665 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1); 666 } else if (s->last_picture_ptr) { 667 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0) 668 return ret; 669 ff_print_debug_info(s, s->last_picture_ptr, pict); 670 ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1); 671 } 672 673 if (s->last_picture_ptr || s->low_delay) { 674 *got_frame = 1; 675 } 676 677 // so we can detect if frame_end was not called (find some nicer solution...) 678 s->current_picture_ptr = NULL; 679 } 680 681 return avpkt->size; 682} 683 684const FFCodec ff_rv10_decoder = { 685 .p.name = "rv10", 686 .p.long_name = NULL_IF_CONFIG_SMALL("RealVideo 1.0"), 687 .p.type = AVMEDIA_TYPE_VIDEO, 688 .p.id = AV_CODEC_ID_RV10, 689 .priv_data_size = sizeof(RVDecContext), 690 .init = rv10_decode_init, 691 .close = rv10_decode_end, 692 FF_CODEC_DECODE_CB(rv10_decode_frame), 693 .p.capabilities = AV_CODEC_CAP_DR1, 694 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 695 .p.max_lowres = 3, 696 .p.pix_fmts = (const enum AVPixelFormat[]) { 697 AV_PIX_FMT_YUV420P, 698 AV_PIX_FMT_NONE 699 }, 700}; 701 702const FFCodec ff_rv20_decoder = { 703 .p.name = "rv20", 704 .p.long_name = NULL_IF_CONFIG_SMALL("RealVideo 2.0"), 705 .p.type = AVMEDIA_TYPE_VIDEO, 706 .p.id = AV_CODEC_ID_RV20, 707 .priv_data_size = sizeof(RVDecContext), 708 .init = rv10_decode_init, 709 .close = rv10_decode_end, 710 FF_CODEC_DECODE_CB(rv10_decode_frame), 711 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY, 712 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 713 .flush = ff_mpeg_flush, 714 .p.max_lowres = 3, 715 .p.pix_fmts = (const enum AVPixelFormat[]) { 716 AV_PIX_FMT_YUV420P, 717 AV_PIX_FMT_NONE 718 }, 719}; 720