1/* 2 * "NUT" Container Format demuxer 3 * Copyright (c) 2004-2006 Michael Niedermayer 4 * Copyright (c) 2003 Alex Beregszaszi 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "libavutil/avstring.h" 24#include "libavutil/avassert.h" 25#include "libavutil/bswap.h" 26#include "libavutil/dict.h" 27#include "libavutil/intreadwrite.h" 28#include "libavutil/mathematics.h" 29#include "libavutil/tree.h" 30#include "libavcodec/bytestream.h" 31#include "avio_internal.h" 32#include "isom.h" 33#include "nut.h" 34#include "riff.h" 35 36#define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */ 37 38static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, 39 int64_t *pos_arg, int64_t pos_limit); 40 41static int get_str(AVIOContext *bc, char *string, unsigned int maxlen) 42{ 43 unsigned int len = ffio_read_varlen(bc); 44 45 if (len && maxlen) 46 avio_read(bc, string, FFMIN(len, maxlen)); 47 while (len > maxlen) { 48 avio_r8(bc); 49 len--; 50 } 51 52 if (maxlen) 53 string[FFMIN(len, maxlen - 1)] = 0; 54 55 if (maxlen == len) 56 return -1; 57 else 58 return 0; 59} 60 61static int64_t get_s(AVIOContext *bc) 62{ 63 int64_t v = ffio_read_varlen(bc) + 1; 64 65 if (v & 1) 66 return -(v >> 1); 67 else 68 return (v >> 1); 69} 70 71static uint64_t get_fourcc(AVIOContext *bc) 72{ 73 unsigned int len = ffio_read_varlen(bc); 74 75 if (len == 2) 76 return avio_rl16(bc); 77 else if (len == 4) 78 return avio_rl32(bc); 79 else { 80 av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len); 81 return -1; 82 } 83} 84 85#ifdef TRACE 86static inline uint64_t get_v_trace(AVIOContext *bc, const char *file, 87 const char *func, int line) 88{ 89 uint64_t v = ffio_read_varlen(bc); 90 91 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", 92 v, v, file, func, line); 93 return v; 94} 95 96static inline int64_t get_s_trace(AVIOContext *bc, const char *file, 97 const char *func, int line) 98{ 99 int64_t v = get_s(bc); 100 101 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", 102 v, v, file, func, line); 103 return v; 104} 105 106static inline uint64_t get_4cc_trace(AVIOContext *bc, char *file, 107 char *func, int line) 108{ 109 uint64_t v = get_fourcc(bc); 110 111 av_log(NULL, AV_LOG_DEBUG, "get_fourcc %5"PRId64" / %"PRIX64" in %s %s:%d\n", 112 v, v, file, func, line); 113 return v; 114} 115#define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) 116#define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) 117#define get_fourcc(bc) get_4cc_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) 118#endif 119 120static int get_packetheader(NUTContext *nut, AVIOContext *bc, 121 int calculate_checksum, uint64_t startcode) 122{ 123 int64_t size; 124// start = avio_tell(bc) - 8; 125 126 startcode = av_be2ne64(startcode); 127 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8); 128 129 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode); 130 size = ffio_read_varlen(bc); 131 if (size > 4096) 132 avio_rb32(bc); 133 if (ffio_get_checksum(bc) && size > 4096) 134 return -1; 135 136 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0); 137 138 return size; 139} 140 141static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos) 142{ 143 uint64_t state = 0; 144 145 if (pos >= 0) 146 /* Note, this may fail if the stream is not seekable, but that should 147 * not matter, as in this case we simply start where we currently are */ 148 avio_seek(bc, pos, SEEK_SET); 149 while (!url_feof(bc)) { 150 state = (state << 8) | avio_r8(bc); 151 if ((state >> 56) != 'N') 152 continue; 153 switch (state) { 154 case MAIN_STARTCODE: 155 case STREAM_STARTCODE: 156 case SYNCPOINT_STARTCODE: 157 case INFO_STARTCODE: 158 case INDEX_STARTCODE: 159 return state; 160 } 161 } 162 163 return 0; 164} 165 166/** 167 * Find the given startcode. 168 * @param code the startcode 169 * @param pos the start position of the search, or -1 if the current position 170 * @return the position of the startcode or -1 if not found 171 */ 172static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos) 173{ 174 for (;;) { 175 uint64_t startcode = find_any_startcode(bc, pos); 176 if (startcode == code) 177 return avio_tell(bc) - 8; 178 else if (startcode == 0) 179 return -1; 180 pos = -1; 181 } 182} 183 184static int nut_probe(AVProbeData *p) 185{ 186 int i; 187 188 for (i = 0; i < p->buf_size-8; i++) { 189 if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32) 190 continue; 191 if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF)) 192 return AVPROBE_SCORE_MAX; 193 } 194 return 0; 195} 196 197#define GET_V(dst, check) \ 198 do { \ 199 tmp = ffio_read_varlen(bc); \ 200 if (!(check)) { \ 201 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \ 202 return AVERROR_INVALIDDATA; \ 203 } \ 204 dst = tmp; \ 205 } while (0) 206 207static int skip_reserved(AVIOContext *bc, int64_t pos) 208{ 209 pos -= avio_tell(bc); 210 if (pos < 0) { 211 avio_seek(bc, pos, SEEK_CUR); 212 return AVERROR_INVALIDDATA; 213 } else { 214 while (pos--) 215 avio_r8(bc); 216 return 0; 217 } 218} 219 220static int decode_main_header(NUTContext *nut) 221{ 222 AVFormatContext *s = nut->avf; 223 AVIOContext *bc = s->pb; 224 uint64_t tmp, end; 225 unsigned int stream_count; 226 int i, j, count; 227 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx; 228 229 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE); 230 end += avio_tell(bc); 231 232 nut->version = ffio_read_varlen(bc); 233 if (nut->version < NUT_MIN_VERSION && 234 nut->version > NUT_MAX_VERSION) { 235 av_log(s, AV_LOG_ERROR, "Version %d not supported.\n", 236 nut->version); 237 return AVERROR(ENOSYS); 238 } 239 if (nut->version > 3) 240 nut->minor_version = ffio_read_varlen(bc); 241 242 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS); 243 244 nut->max_distance = ffio_read_varlen(bc); 245 if (nut->max_distance > 65536) { 246 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance); 247 nut->max_distance = 65536; 248 } 249 250 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational)); 251 nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational)); 252 if (!nut->time_base) 253 return AVERROR(ENOMEM); 254 255 for (i = 0; i < nut->time_base_count; i++) { 256 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31)); 257 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31)); 258 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) { 259 av_log(s, AV_LOG_ERROR, "time base invalid\n"); 260 return AVERROR_INVALIDDATA; 261 } 262 } 263 tmp_pts = 0; 264 tmp_mul = 1; 265 tmp_stream = 0; 266 tmp_head_idx = 0; 267 for (i = 0; i < 256;) { 268 int tmp_flags = ffio_read_varlen(bc); 269 int tmp_fields = ffio_read_varlen(bc); 270 271 if (tmp_fields > 0) 272 tmp_pts = get_s(bc); 273 if (tmp_fields > 1) 274 tmp_mul = ffio_read_varlen(bc); 275 if (tmp_fields > 2) 276 tmp_stream = ffio_read_varlen(bc); 277 if (tmp_fields > 3) 278 tmp_size = ffio_read_varlen(bc); 279 else 280 tmp_size = 0; 281 if (tmp_fields > 4) 282 tmp_res = ffio_read_varlen(bc); 283 else 284 tmp_res = 0; 285 if (tmp_fields > 5) 286 count = ffio_read_varlen(bc); 287 else 288 count = tmp_mul - tmp_size; 289 if (tmp_fields > 6) 290 get_s(bc); 291 if (tmp_fields > 7) 292 tmp_head_idx = ffio_read_varlen(bc); 293 294 while (tmp_fields-- > 8) 295 ffio_read_varlen(bc); 296 297 if (count == 0 || i + count > 256) { 298 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i); 299 return AVERROR_INVALIDDATA; 300 } 301 if (tmp_stream >= stream_count) { 302 av_log(s, AV_LOG_ERROR, "illegal stream number\n"); 303 return AVERROR_INVALIDDATA; 304 } 305 306 for (j = 0; j < count; j++, i++) { 307 if (i == 'N') { 308 nut->frame_code[i].flags = FLAG_INVALID; 309 j--; 310 continue; 311 } 312 nut->frame_code[i].flags = tmp_flags; 313 nut->frame_code[i].pts_delta = tmp_pts; 314 nut->frame_code[i].stream_id = tmp_stream; 315 nut->frame_code[i].size_mul = tmp_mul; 316 nut->frame_code[i].size_lsb = tmp_size + j; 317 nut->frame_code[i].reserved_count = tmp_res; 318 nut->frame_code[i].header_idx = tmp_head_idx; 319 } 320 } 321 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID); 322 323 if (end > avio_tell(bc) + 4) { 324 int rem = 1024; 325 GET_V(nut->header_count, tmp < 128U); 326 nut->header_count++; 327 for (i = 1; i < nut->header_count; i++) { 328 uint8_t *hdr; 329 GET_V(nut->header_len[i], tmp > 0 && tmp < 256); 330 rem -= nut->header_len[i]; 331 if (rem < 0) { 332 av_log(s, AV_LOG_ERROR, "invalid elision header\n"); 333 return AVERROR_INVALIDDATA; 334 } 335 hdr = av_malloc(nut->header_len[i]); 336 if (!hdr) 337 return AVERROR(ENOMEM); 338 avio_read(bc, hdr, nut->header_len[i]); 339 nut->header[i] = hdr; 340 } 341 av_assert0(nut->header_len[0] == 0); 342 } 343 344 // flags had been effectively introduced in version 4 345 if (nut->version > 3 && end > avio_tell(bc) + 4) { 346 nut->flags = ffio_read_varlen(bc); 347 } 348 349 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { 350 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n"); 351 return AVERROR_INVALIDDATA; 352 } 353 354 nut->stream = av_calloc(stream_count, sizeof(StreamContext)); 355 if (!nut->stream) 356 return AVERROR(ENOMEM); 357 for (i = 0; i < stream_count; i++) 358 avformat_new_stream(s, NULL); 359 360 return 0; 361} 362 363static int decode_stream_header(NUTContext *nut) 364{ 365 AVFormatContext *s = nut->avf; 366 AVIOContext *bc = s->pb; 367 StreamContext *stc; 368 int class, stream_id; 369 uint64_t tmp, end; 370 AVStream *st; 371 372 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE); 373 end += avio_tell(bc); 374 375 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base); 376 stc = &nut->stream[stream_id]; 377 st = s->streams[stream_id]; 378 if (!st) 379 return AVERROR(ENOMEM); 380 381 class = ffio_read_varlen(bc); 382 tmp = get_fourcc(bc); 383 st->codec->codec_tag = tmp; 384 switch (class) { 385 case 0: 386 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 387 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) { 388 ff_nut_video_tags, 389 ff_codec_bmp_tags, 390 ff_codec_movvideo_tags, 391 0 392 }, 393 tmp); 394 break; 395 case 1: 396 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 397 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) { 398 ff_nut_audio_tags, 399 ff_codec_wav_tags, 400 ff_nut_audio_extra_tags, 401 0 402 }, 403 tmp); 404 break; 405 case 2: 406 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; 407 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp); 408 break; 409 case 3: 410 st->codec->codec_type = AVMEDIA_TYPE_DATA; 411 st->codec->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp); 412 break; 413 default: 414 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class); 415 return AVERROR(ENOSYS); 416 } 417 if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE) 418 av_log(s, AV_LOG_ERROR, 419 "Unknown codec tag '0x%04x' for stream number %d\n", 420 (unsigned int) tmp, stream_id); 421 422 GET_V(stc->time_base_id, tmp < nut->time_base_count); 423 GET_V(stc->msb_pts_shift, tmp < 16); 424 stc->max_pts_distance = ffio_read_varlen(bc); 425 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true 426 st->codec->has_b_frames = stc->decode_delay; 427 ffio_read_varlen(bc); // stream flags 428 429 GET_V(st->codec->extradata_size, tmp < (1 << 30)); 430 if (st->codec->extradata_size) { 431 if (ff_get_extradata(st->codec, bc, st->codec->extradata_size) < 0) 432 return AVERROR(ENOMEM); 433 } 434 435 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { 436 GET_V(st->codec->width, tmp > 0); 437 GET_V(st->codec->height, tmp > 0); 438 st->sample_aspect_ratio.num = ffio_read_varlen(bc); 439 st->sample_aspect_ratio.den = ffio_read_varlen(bc); 440 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) { 441 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", 442 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den); 443 return AVERROR_INVALIDDATA; 444 } 445 ffio_read_varlen(bc); /* csp type */ 446 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { 447 GET_V(st->codec->sample_rate, tmp > 0); 448 ffio_read_varlen(bc); // samplerate_den 449 GET_V(st->codec->channels, tmp > 0); 450 } 451 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { 452 av_log(s, AV_LOG_ERROR, 453 "stream header %d checksum mismatch\n", stream_id); 454 return AVERROR_INVALIDDATA; 455 } 456 stc->time_base = &nut->time_base[stc->time_base_id]; 457 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, 458 stc->time_base->den); 459 return 0; 460} 461 462static void set_disposition_bits(AVFormatContext *avf, char *value, 463 int stream_id) 464{ 465 int flag = 0, i; 466 467 for (i = 0; ff_nut_dispositions[i].flag; ++i) 468 if (!strcmp(ff_nut_dispositions[i].str, value)) 469 flag = ff_nut_dispositions[i].flag; 470 if (!flag) 471 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value); 472 for (i = 0; i < avf->nb_streams; ++i) 473 if (stream_id == i || stream_id == -1) 474 avf->streams[i]->disposition |= flag; 475} 476 477static int decode_info_header(NUTContext *nut) 478{ 479 AVFormatContext *s = nut->avf; 480 AVIOContext *bc = s->pb; 481 uint64_t tmp, chapter_start, chapter_len; 482 unsigned int stream_id_plus1, count; 483 int chapter_id, i; 484 int64_t value, end; 485 char name[256], str_value[1024], type_str[256]; 486 const char *type; 487 AVChapter *chapter = NULL; 488 AVStream *st = NULL; 489 AVDictionary **metadata = NULL; 490 491 end = get_packetheader(nut, bc, 1, INFO_STARTCODE); 492 end += avio_tell(bc); 493 494 GET_V(stream_id_plus1, tmp <= s->nb_streams); 495 chapter_id = get_s(bc); 496 chapter_start = ffio_read_varlen(bc); 497 chapter_len = ffio_read_varlen(bc); 498 count = ffio_read_varlen(bc); 499 500 if (chapter_id && !stream_id_plus1) { 501 int64_t start = chapter_start / nut->time_base_count; 502 chapter = avpriv_new_chapter(s, chapter_id, 503 nut->time_base[chapter_start % 504 nut->time_base_count], 505 start, start + chapter_len, NULL); 506 metadata = &chapter->metadata; 507 } else if (stream_id_plus1) { 508 st = s->streams[stream_id_plus1 - 1]; 509 metadata = &st->metadata; 510 } else 511 metadata = &s->metadata; 512 513 for (i = 0; i < count; i++) { 514 get_str(bc, name, sizeof(name)); 515 value = get_s(bc); 516 if (value == -1) { 517 type = "UTF-8"; 518 get_str(bc, str_value, sizeof(str_value)); 519 } else if (value == -2) { 520 get_str(bc, type_str, sizeof(type_str)); 521 type = type_str; 522 get_str(bc, str_value, sizeof(str_value)); 523 } else if (value == -3) { 524 type = "s"; 525 value = get_s(bc); 526 } else if (value == -4) { 527 type = "t"; 528 value = ffio_read_varlen(bc); 529 } else if (value < -4) { 530 type = "r"; 531 get_s(bc); 532 } else { 533 type = "v"; 534 } 535 536 if (stream_id_plus1 > s->nb_streams) { 537 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n"); 538 continue; 539 } 540 541 if (!strcmp(type, "UTF-8")) { 542 if (chapter_id == 0 && !strcmp(name, "Disposition")) { 543 set_disposition_bits(s, str_value, stream_id_plus1 - 1); 544 continue; 545 } 546 547 if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) { 548 sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den); 549 if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den) 550 st->r_frame_rate.num = st->r_frame_rate.den = 0; 551 continue; 552 } 553 554 if (metadata && av_strcasecmp(name, "Uses") && 555 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) 556 av_dict_set(metadata, name, str_value, 0); 557 } 558 } 559 560 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { 561 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n"); 562 return AVERROR_INVALIDDATA; 563 } 564 return 0; 565} 566 567static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr) 568{ 569 AVFormatContext *s = nut->avf; 570 AVIOContext *bc = s->pb; 571 int64_t end; 572 uint64_t tmp; 573 int ret; 574 575 nut->last_syncpoint_pos = avio_tell(bc) - 8; 576 577 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE); 578 end += avio_tell(bc); 579 580 tmp = ffio_read_varlen(bc); 581 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc); 582 if (*back_ptr < 0) 583 return AVERROR_INVALIDDATA; 584 585 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], 586 tmp / nut->time_base_count); 587 588 if (nut->flags & NUT_BROADCAST) { 589 tmp = ffio_read_varlen(bc); 590 av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n", 591 av_rescale_q(tmp / nut->time_base_count, 592 nut->time_base[tmp % nut->time_base_count], 593 AV_TIME_BASE_Q)); 594 } 595 596 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { 597 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n"); 598 return AVERROR_INVALIDDATA; 599 } 600 601 *ts = tmp / nut->time_base_count * 602 av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE; 603 604 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0) 605 return ret; 606 607 return 0; 608} 609 610//FIXME calculate exactly, this is just a good approximation. 611static int64_t find_duration(NUTContext *nut, int64_t filesize) 612{ 613 AVFormatContext *s = nut->avf; 614 int64_t duration = 0; 615 616 ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp); 617 618 if(duration > 0) 619 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS; 620 return duration; 621} 622 623static int find_and_decode_index(NUTContext *nut) 624{ 625 AVFormatContext *s = nut->avf; 626 AVIOContext *bc = s->pb; 627 uint64_t tmp, end; 628 int i, j, syncpoint_count; 629 int64_t filesize = avio_size(bc); 630 int64_t *syncpoints; 631 uint64_t max_pts; 632 int8_t *has_keyframe; 633 int ret = AVERROR_INVALIDDATA; 634 635 if(filesize <= 0) 636 return -1; 637 638 avio_seek(bc, filesize - 12, SEEK_SET); 639 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET); 640 if (avio_rb64(bc) != INDEX_STARTCODE) { 641 av_log(s, AV_LOG_ERROR, "no index at the end\n"); 642 643 if(s->duration<=0) 644 s->duration = find_duration(nut, filesize); 645 return ret; 646 } 647 648 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE); 649 end += avio_tell(bc); 650 651 max_pts = ffio_read_varlen(bc); 652 s->duration = av_rescale_q(max_pts / nut->time_base_count, 653 nut->time_base[max_pts % nut->time_base_count], 654 AV_TIME_BASE_Q); 655 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS; 656 657 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0); 658 syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t)); 659 has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t)); 660 if (!syncpoints || !has_keyframe) { 661 ret = AVERROR(ENOMEM); 662 goto fail; 663 } 664 for (i = 0; i < syncpoint_count; i++) { 665 syncpoints[i] = ffio_read_varlen(bc); 666 if (syncpoints[i] <= 0) 667 goto fail; 668 if (i) 669 syncpoints[i] += syncpoints[i - 1]; 670 } 671 672 for (i = 0; i < s->nb_streams; i++) { 673 int64_t last_pts = -1; 674 for (j = 0; j < syncpoint_count;) { 675 uint64_t x = ffio_read_varlen(bc); 676 int type = x & 1; 677 int n = j; 678 x >>= 1; 679 if (type) { 680 int flag = x & 1; 681 x >>= 1; 682 if (n + x >= syncpoint_count + 1) { 683 av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1); 684 goto fail; 685 } 686 while (x--) 687 has_keyframe[n++] = flag; 688 has_keyframe[n++] = !flag; 689 } else { 690 while (x != 1) { 691 if (n >= syncpoint_count + 1) { 692 av_log(s, AV_LOG_ERROR, "index overflow B\n"); 693 goto fail; 694 } 695 has_keyframe[n++] = x & 1; 696 x >>= 1; 697 } 698 } 699 if (has_keyframe[0]) { 700 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n"); 701 goto fail; 702 } 703 av_assert0(n <= syncpoint_count + 1); 704 for (; j < n && j < syncpoint_count; j++) { 705 if (has_keyframe[j]) { 706 uint64_t B, A = ffio_read_varlen(bc); 707 if (!A) { 708 A = ffio_read_varlen(bc); 709 B = ffio_read_varlen(bc); 710 // eor_pts[j][i] = last_pts + A + B 711 } else 712 B = 0; 713 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1], 714 last_pts + A, 0, 0, AVINDEX_KEYFRAME); 715 last_pts += A + B; 716 } 717 } 718 } 719 } 720 721 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) { 722 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n"); 723 goto fail; 724 } 725 ret = 0; 726 727fail: 728 av_free(syncpoints); 729 av_free(has_keyframe); 730 return ret; 731} 732 733static int nut_read_header(AVFormatContext *s) 734{ 735 NUTContext *nut = s->priv_data; 736 AVIOContext *bc = s->pb; 737 int64_t pos; 738 int initialized_stream_count; 739 740 nut->avf = s; 741 742 /* main header */ 743 pos = 0; 744 do { 745 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1; 746 if (pos < 0 + 1) { 747 av_log(s, AV_LOG_ERROR, "No main startcode found.\n"); 748 return AVERROR_INVALIDDATA; 749 } 750 } while (decode_main_header(nut) < 0); 751 752 /* stream headers */ 753 pos = 0; 754 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) { 755 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1; 756 if (pos < 0 + 1) { 757 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n"); 758 return AVERROR_INVALIDDATA; 759 } 760 if (decode_stream_header(nut) >= 0) 761 initialized_stream_count++; 762 } 763 764 /* info headers */ 765 pos = 0; 766 for (;;) { 767 uint64_t startcode = find_any_startcode(bc, pos); 768 pos = avio_tell(bc); 769 770 if (startcode == 0) { 771 av_log(s, AV_LOG_ERROR, "EOF before video frames\n"); 772 return AVERROR_INVALIDDATA; 773 } else if (startcode == SYNCPOINT_STARTCODE) { 774 nut->next_startcode = startcode; 775 break; 776 } else if (startcode != INFO_STARTCODE) { 777 continue; 778 } 779 780 decode_info_header(nut); 781 } 782 783 s->data_offset = pos - 8; 784 785 if (bc->seekable) { 786 int64_t orig_pos = avio_tell(bc); 787 find_and_decode_index(nut); 788 avio_seek(bc, orig_pos, SEEK_SET); 789 } 790 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE); 791 792 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv); 793 794 return 0; 795} 796 797static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos) 798{ 799 int count = ffio_read_varlen(bc); 800 int skip_start = 0; 801 int skip_end = 0; 802 int channels = 0; 803 int64_t channel_layout = 0; 804 int sample_rate = 0; 805 int width = 0; 806 int height = 0; 807 int i; 808 809 for (i=0; i<count; i++) { 810 uint8_t name[256], str_value[256], type_str[256]; 811 int value; 812 if (avio_tell(bc) >= maxpos) 813 return AVERROR_INVALIDDATA; 814 get_str(bc, name, sizeof(name)); 815 value = get_s(bc); 816 817 if (value == -1) { 818 get_str(bc, str_value, sizeof(str_value)); 819 av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value); 820 } else if (value == -2) { 821 uint8_t *dst = NULL; 822 int64_t v64, value_len; 823 824 get_str(bc, type_str, sizeof(type_str)); 825 value_len = ffio_read_varlen(bc); 826 if (avio_tell(bc) + value_len >= maxpos) 827 return AVERROR_INVALIDDATA; 828 if (!strcmp(name, "Palette")) { 829 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len); 830 } else if (!strcmp(name, "Extradata")) { 831 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len); 832 } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) { 833 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8); 834 if(!dst) 835 return AVERROR(ENOMEM); 836 AV_WB64(dst, v64); 837 dst += 8; 838 } else if (!strcmp(name, "ChannelLayout") && value_len == 8) { 839 channel_layout = avio_rl64(bc); 840 continue; 841 } else { 842 av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str); 843 avio_skip(bc, value_len); 844 continue; 845 } 846 if(!dst) 847 return AVERROR(ENOMEM); 848 avio_read(bc, dst, value_len); 849 } else if (value == -3) { 850 value = get_s(bc); 851 } else if (value == -4) { 852 value = ffio_read_varlen(bc); 853 } else if (value < -4) { 854 get_s(bc); 855 } else { 856 if (!strcmp(name, "SkipStart")) { 857 skip_start = value; 858 } else if (!strcmp(name, "SkipEnd")) { 859 skip_end = value; 860 } else if (!strcmp(name, "Channels")) { 861 channels = value; 862 } else if (!strcmp(name, "SampleRate")) { 863 sample_rate = value; 864 } else if (!strcmp(name, "Width")) { 865 width = value; 866 } else if (!strcmp(name, "Height")) { 867 height = value; 868 } else { 869 av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name); 870 } 871 } 872 } 873 874 if (channels || channel_layout || sample_rate || width || height) { 875 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 28); 876 if (!dst) 877 return AVERROR(ENOMEM); 878 bytestream_put_le32(&dst, 879 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT*(!!channels) + 880 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) + 881 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) + 882 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height)) 883 ); 884 if (channels) 885 bytestream_put_le32(&dst, channels); 886 if (channel_layout) 887 bytestream_put_le64(&dst, channel_layout); 888 if (sample_rate) 889 bytestream_put_le32(&dst, sample_rate); 890 if (width || height){ 891 bytestream_put_le32(&dst, width); 892 bytestream_put_le32(&dst, height); 893 } 894 } 895 896 if (skip_start || skip_end) { 897 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10); 898 if (!dst) 899 return AVERROR(ENOMEM); 900 AV_WL32(dst, skip_start); 901 AV_WL32(dst+4, skip_end); 902 } 903 904 return 0; 905} 906 907static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, 908 uint8_t *header_idx, int frame_code) 909{ 910 AVFormatContext *s = nut->avf; 911 AVIOContext *bc = s->pb; 912 StreamContext *stc; 913 int size, flags, size_mul, pts_delta, i, reserved_count; 914 uint64_t tmp; 915 916 if (!(nut->flags & NUT_PIPE) && 917 avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) { 918 av_log(s, AV_LOG_ERROR, 919 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n", 920 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance); 921 return AVERROR_INVALIDDATA; 922 } 923 924 flags = nut->frame_code[frame_code].flags; 925 size_mul = nut->frame_code[frame_code].size_mul; 926 size = nut->frame_code[frame_code].size_lsb; 927 *stream_id = nut->frame_code[frame_code].stream_id; 928 pts_delta = nut->frame_code[frame_code].pts_delta; 929 reserved_count = nut->frame_code[frame_code].reserved_count; 930 *header_idx = nut->frame_code[frame_code].header_idx; 931 932 if (flags & FLAG_INVALID) 933 return AVERROR_INVALIDDATA; 934 if (flags & FLAG_CODED) 935 flags ^= ffio_read_varlen(bc); 936 if (flags & FLAG_STREAM_ID) { 937 GET_V(*stream_id, tmp < s->nb_streams); 938 } 939 stc = &nut->stream[*stream_id]; 940 if (flags & FLAG_CODED_PTS) { 941 int coded_pts = ffio_read_varlen(bc); 942 // FIXME check last_pts validity? 943 if (coded_pts < (1 << stc->msb_pts_shift)) { 944 *pts = ff_lsb2full(stc, coded_pts); 945 } else 946 *pts = coded_pts - (1LL << stc->msb_pts_shift); 947 } else 948 *pts = stc->last_pts + pts_delta; 949 if (flags & FLAG_SIZE_MSB) 950 size += size_mul * ffio_read_varlen(bc); 951 if (flags & FLAG_MATCH_TIME) 952 get_s(bc); 953 if (flags & FLAG_HEADER_IDX) 954 *header_idx = ffio_read_varlen(bc); 955 if (flags & FLAG_RESERVED) 956 reserved_count = ffio_read_varlen(bc); 957 for (i = 0; i < reserved_count; i++) 958 ffio_read_varlen(bc); 959 960 if (*header_idx >= (unsigned)nut->header_count) { 961 av_log(s, AV_LOG_ERROR, "header_idx invalid\n"); 962 return AVERROR_INVALIDDATA; 963 } 964 if (size > 4096) 965 *header_idx = 0; 966 size -= nut->header_len[*header_idx]; 967 968 if (flags & FLAG_CHECKSUM) { 969 avio_rb32(bc); // FIXME check this 970 } else if (!(nut->flags & NUT_PIPE) && 971 size > 2 * nut->max_distance || 972 FFABS(stc->last_pts - *pts) > stc->max_pts_distance) { 973 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n"); 974 return AVERROR_INVALIDDATA; 975 } 976 977 stc->last_pts = *pts; 978 stc->last_flags = flags; 979 980 return size; 981} 982 983static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code) 984{ 985 AVFormatContext *s = nut->avf; 986 AVIOContext *bc = s->pb; 987 int size, stream_id, discard; 988 int64_t pts, last_IP_pts; 989 StreamContext *stc; 990 uint8_t header_idx; 991 int ret; 992 993 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code); 994 if (size < 0) 995 return size; 996 997 stc = &nut->stream[stream_id]; 998 999 if (stc->last_flags & FLAG_KEY) 1000 stc->skip_until_key_frame = 0; 1001 1002 discard = s->streams[stream_id]->discard; 1003 last_IP_pts = s->streams[stream_id]->last_IP_pts; 1004 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) || 1005 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && 1006 last_IP_pts > pts) || 1007 discard >= AVDISCARD_ALL || 1008 stc->skip_until_key_frame) { 1009 avio_skip(bc, size); 1010 return 1; 1011 } 1012 1013 if (av_new_packet(pkt, size + nut->header_len[header_idx]) < 0) 1014 return AVERROR(ENOMEM); 1015 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]); 1016 pkt->pos = avio_tell(bc); // FIXME 1017 if (stc->last_flags & FLAG_SM_DATA) { 1018 int sm_size; 1019 if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0) 1020 return AVERROR_INVALIDDATA; 1021 if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0) 1022 return AVERROR_INVALIDDATA; 1023 sm_size = avio_tell(bc) - pkt->pos; 1024 size -= sm_size; 1025 pkt->size -= sm_size; 1026 } 1027 1028 ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size); 1029 if (ret != size) { 1030 if (ret < 0) 1031 return ret; 1032 } 1033 av_shrink_packet(pkt, nut->header_len[header_idx] + ret); 1034 1035 pkt->stream_index = stream_id; 1036 if (stc->last_flags & FLAG_KEY) 1037 pkt->flags |= AV_PKT_FLAG_KEY; 1038 pkt->pts = pts; 1039 1040 return 0; 1041} 1042 1043static int nut_read_packet(AVFormatContext *s, AVPacket *pkt) 1044{ 1045 NUTContext *nut = s->priv_data; 1046 AVIOContext *bc = s->pb; 1047 int i, frame_code = 0, ret, skip; 1048 int64_t ts, back_ptr; 1049 1050 for (;;) { 1051 int64_t pos = avio_tell(bc); 1052 uint64_t tmp = nut->next_startcode; 1053 nut->next_startcode = 0; 1054 1055 if (tmp) { 1056 pos -= 8; 1057 } else { 1058 frame_code = avio_r8(bc); 1059 if (url_feof(bc)) 1060 return AVERROR_EOF; 1061 if (frame_code == 'N') { 1062 tmp = frame_code; 1063 for (i = 1; i < 8; i++) 1064 tmp = (tmp << 8) + avio_r8(bc); 1065 } 1066 } 1067 switch (tmp) { 1068 case MAIN_STARTCODE: 1069 case STREAM_STARTCODE: 1070 case INDEX_STARTCODE: 1071 skip = get_packetheader(nut, bc, 0, tmp); 1072 avio_skip(bc, skip); 1073 break; 1074 case INFO_STARTCODE: 1075 if (decode_info_header(nut) < 0) 1076 goto resync; 1077 break; 1078 case SYNCPOINT_STARTCODE: 1079 if (decode_syncpoint(nut, &ts, &back_ptr) < 0) 1080 goto resync; 1081 frame_code = avio_r8(bc); 1082 case 0: 1083 ret = decode_frame(nut, pkt, frame_code); 1084 if (ret == 0) 1085 return 0; 1086 else if (ret == 1) // OK but discard packet 1087 break; 1088 default: 1089resync: 1090 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos); 1091 tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1); 1092 if (tmp == 0) 1093 return AVERROR_INVALIDDATA; 1094 av_log(s, AV_LOG_DEBUG, "sync\n"); 1095 nut->next_startcode = tmp; 1096 } 1097 } 1098} 1099 1100static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, 1101 int64_t *pos_arg, int64_t pos_limit) 1102{ 1103 NUTContext *nut = s->priv_data; 1104 AVIOContext *bc = s->pb; 1105 int64_t pos, pts, back_ptr; 1106 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", 1107 stream_index, *pos_arg, pos_limit); 1108 1109 pos = *pos_arg; 1110 do { 1111 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1; 1112 if (pos < 1) { 1113 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n"); 1114 return AV_NOPTS_VALUE; 1115 } 1116 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0); 1117 *pos_arg = pos - 1; 1118 av_assert0(nut->last_syncpoint_pos == *pos_arg); 1119 1120 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr); 1121 if (stream_index == -2) 1122 return back_ptr; 1123 av_assert0(stream_index == -1); 1124 return pts; 1125} 1126 1127static int read_seek(AVFormatContext *s, int stream_index, 1128 int64_t pts, int flags) 1129{ 1130 NUTContext *nut = s->priv_data; 1131 AVStream *st = s->streams[stream_index]; 1132 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE }; 1133 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE }; 1134 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp }; 1135 int64_t pos, pos2, ts; 1136 int i; 1137 1138 if (nut->flags & NUT_PIPE) { 1139 return AVERROR(ENOSYS); 1140 } 1141 1142 if (st->index_entries) { 1143 int index = av_index_search_timestamp(st, pts, flags); 1144 if (index < 0) 1145 index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD); 1146 if (index < 0) 1147 return -1; 1148 1149 pos2 = st->index_entries[index].pos; 1150 ts = st->index_entries[index].timestamp; 1151 } else { 1152 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp, 1153 (void **) next_node); 1154 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", 1155 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts, 1156 next_node[1]->ts); 1157 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos, 1158 next_node[1]->pos, next_node[1]->pos, 1159 next_node[0]->ts, next_node[1]->ts, 1160 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp); 1161 1162 if (!(flags & AVSEEK_FLAG_BACKWARD)) { 1163 dummy.pos = pos + 16; 1164 next_node[1] = &nopts_sp; 1165 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, 1166 (void **) next_node); 1167 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos, 1168 next_node[1]->pos, next_node[1]->pos, 1169 next_node[0]->back_ptr, next_node[1]->back_ptr, 1170 flags, &ts, nut_read_timestamp); 1171 if (pos2 >= 0) 1172 pos = pos2; 1173 // FIXME dir but I think it does not matter 1174 } 1175 dummy.pos = pos; 1176 sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, 1177 NULL); 1178 1179 av_assert0(sp); 1180 pos2 = sp->back_ptr - 15; 1181 } 1182 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2); 1183 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2); 1184 avio_seek(s->pb, pos, SEEK_SET); 1185 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos); 1186 if (pos2 > pos || pos2 + 15 < pos) 1187 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n"); 1188 for (i = 0; i < s->nb_streams; i++) 1189 nut->stream[i].skip_until_key_frame = 1; 1190 1191 return 0; 1192} 1193 1194static int nut_read_close(AVFormatContext *s) 1195{ 1196 NUTContext *nut = s->priv_data; 1197 int i; 1198 1199 av_freep(&nut->time_base); 1200 av_freep(&nut->stream); 1201 ff_nut_free_sp(nut); 1202 for (i = 1; i < nut->header_count; i++) 1203 av_freep(&nut->header[i]); 1204 1205 return 0; 1206} 1207 1208AVInputFormat ff_nut_demuxer = { 1209 .name = "nut", 1210 .long_name = NULL_IF_CONFIG_SMALL("NUT"), 1211 .flags = AVFMT_SEEK_TO_PTS, 1212 .priv_data_size = sizeof(NUTContext), 1213 .read_probe = nut_probe, 1214 .read_header = nut_read_header, 1215 .read_packet = nut_read_packet, 1216 .read_close = nut_read_close, 1217 .read_seek = read_seek, 1218 .extensions = "nut", 1219 .codec_tag = ff_nut_codec_tags, 1220}; 1221