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 Libav. 7 * 8 * Libav 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 * Libav 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 Libav; 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/bswap.h" 25#include "libavutil/dict.h" 26#include "libavutil/mathematics.h" 27#include "libavutil/tree.h" 28#include "avio_internal.h" 29#include "nut.h" 30 31#undef NDEBUG 32#include <assert.h> 33 34#define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */ 35 36static int get_str(AVIOContext *bc, char *string, unsigned int maxlen){ 37 unsigned int len= ffio_read_varlen(bc); 38 39 if(len && maxlen) 40 avio_read(bc, string, FFMIN(len, maxlen)); 41 while(len > maxlen){ 42 avio_r8(bc); 43 len--; 44 } 45 46 if(maxlen) 47 string[FFMIN(len, maxlen-1)]= 0; 48 49 if(maxlen == len) 50 return -1; 51 else 52 return 0; 53} 54 55static int64_t get_s(AVIOContext *bc){ 56 int64_t v = ffio_read_varlen(bc) + 1; 57 58 if (v&1) return -(v>>1); 59 else return (v>>1); 60} 61 62static uint64_t get_fourcc(AVIOContext *bc){ 63 unsigned int len= ffio_read_varlen(bc); 64 65 if (len==2) return avio_rl16(bc); 66 else if(len==4) return avio_rl32(bc); 67 else return -1; 68} 69 70#ifdef TRACE 71static inline uint64_t get_v_trace(AVIOContext *bc, char *file, char *func, int line){ 72 uint64_t v= ffio_read_varlen(bc); 73 74 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 75 return v; 76} 77 78static inline int64_t get_s_trace(AVIOContext *bc, char *file, char *func, int line){ 79 int64_t v= get_s(bc); 80 81 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 82 return v; 83} 84 85static inline uint64_t get_vb_trace(AVIOContext *bc, char *file, char *func, int line){ 86 uint64_t v= get_vb(bc); 87 88 av_log(NULL, AV_LOG_DEBUG, "get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 89 return v; 90} 91#define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) 92#define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) 93#define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) 94#endif 95 96static int get_packetheader(NUTContext *nut, AVIOContext *bc, int calculate_checksum, uint64_t startcode) 97{ 98 int64_t size; 99// start= avio_tell(bc) - 8; 100 101 startcode= av_be2ne64(startcode); 102 startcode= ff_crc04C11DB7_update(0, (uint8_t*)&startcode, 8); 103 104 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode); 105 size= ffio_read_varlen(bc); 106 if(size > 4096) 107 avio_rb32(bc); 108 if(ffio_get_checksum(bc) && size > 4096) 109 return -1; 110 111 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0); 112 113 return size; 114} 115 116static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos){ 117 uint64_t state=0; 118 119 if(pos >= 0) 120 avio_seek(bc, pos, SEEK_SET); //note, this may fail if the stream is not seekable, but that should not matter, as in this case we simply start where we currently are 121 122 while(!bc->eof_reached){ 123 state= (state<<8) | avio_r8(bc); 124 if((state>>56) != 'N') 125 continue; 126 switch(state){ 127 case MAIN_STARTCODE: 128 case STREAM_STARTCODE: 129 case SYNCPOINT_STARTCODE: 130 case INFO_STARTCODE: 131 case INDEX_STARTCODE: 132 return state; 133 } 134 } 135 136 return 0; 137} 138 139/** 140 * Find the given startcode. 141 * @param code the startcode 142 * @param pos the start position of the search, or -1 if the current position 143 * @return the position of the startcode or -1 if not found 144 */ 145static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos){ 146 for(;;){ 147 uint64_t startcode= find_any_startcode(bc, pos); 148 if(startcode == code) 149 return avio_tell(bc) - 8; 150 else if(startcode == 0) 151 return -1; 152 pos=-1; 153 } 154} 155 156static int nut_probe(AVProbeData *p){ 157 int i; 158 uint64_t code= 0; 159 160 for (i = 0; i < p->buf_size; i++) { 161 code = (code << 8) | p->buf[i]; 162 if (code == MAIN_STARTCODE) 163 return AVPROBE_SCORE_MAX; 164 } 165 return 0; 166} 167 168#define GET_V(dst, check) \ 169 tmp= ffio_read_varlen(bc);\ 170 if(!(check)){\ 171 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\ 172 return -1;\ 173 }\ 174 dst= tmp; 175 176static int skip_reserved(AVIOContext *bc, int64_t pos){ 177 pos -= avio_tell(bc); 178 if(pos<0){ 179 avio_seek(bc, pos, SEEK_CUR); 180 return -1; 181 }else{ 182 while(pos--) 183 avio_r8(bc); 184 return 0; 185 } 186} 187 188static int decode_main_header(NUTContext *nut){ 189 AVFormatContext *s= nut->avf; 190 AVIOContext *bc = s->pb; 191 uint64_t tmp, end; 192 unsigned int stream_count; 193 int i, j, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res, tmp_head_idx; 194 195 end= get_packetheader(nut, bc, 1, MAIN_STARTCODE); 196 end += avio_tell(bc); 197 198 GET_V(tmp , tmp >=2 && tmp <= 3) 199 GET_V(stream_count , tmp > 0 && tmp <= NUT_MAX_STREAMS) 200 201 nut->max_distance = ffio_read_varlen(bc); 202 if(nut->max_distance > 65536){ 203 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance); 204 nut->max_distance= 65536; 205 } 206 207 GET_V(nut->time_base_count, tmp>0 && tmp<INT_MAX / sizeof(AVRational)) 208 nut->time_base= av_malloc(nut->time_base_count * sizeof(AVRational)); 209 210 for(i=0; i<nut->time_base_count; i++){ 211 GET_V(nut->time_base[i].num, tmp>0 && tmp<(1ULL<<31)) 212 GET_V(nut->time_base[i].den, tmp>0 && tmp<(1ULL<<31)) 213 if(av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1){ 214 av_log(s, AV_LOG_ERROR, "time base invalid\n"); 215 return AVERROR_INVALIDDATA; 216 } 217 } 218 tmp_pts=0; 219 tmp_mul=1; 220 tmp_stream=0; 221 tmp_head_idx= 0; 222 for(i=0; i<256;){ 223 int tmp_flags = ffio_read_varlen(bc); 224 int tmp_fields= ffio_read_varlen(bc); 225 if(tmp_fields>0) tmp_pts = get_s(bc); 226 if(tmp_fields>1) tmp_mul = ffio_read_varlen(bc); 227 if(tmp_fields>2) tmp_stream= ffio_read_varlen(bc); 228 if(tmp_fields>3) tmp_size = ffio_read_varlen(bc); 229 else tmp_size = 0; 230 if(tmp_fields>4) tmp_res = ffio_read_varlen(bc); 231 else tmp_res = 0; 232 if(tmp_fields>5) count = ffio_read_varlen(bc); 233 else count = tmp_mul - tmp_size; 234 if(tmp_fields>6) get_s(bc); 235 if(tmp_fields>7) tmp_head_idx= ffio_read_varlen(bc); 236 237 while(tmp_fields-- > 8) 238 ffio_read_varlen(bc); 239 240 if(count == 0 || i+count > 256){ 241 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i); 242 return AVERROR_INVALIDDATA; 243 } 244 if(tmp_stream >= stream_count){ 245 av_log(s, AV_LOG_ERROR, "illegal stream number\n"); 246 return AVERROR_INVALIDDATA; 247 } 248 249 for(j=0; j<count; j++,i++){ 250 if (i == 'N') { 251 nut->frame_code[i].flags= FLAG_INVALID; 252 j--; 253 continue; 254 } 255 nut->frame_code[i].flags = tmp_flags ; 256 nut->frame_code[i].pts_delta = tmp_pts ; 257 nut->frame_code[i].stream_id = tmp_stream; 258 nut->frame_code[i].size_mul = tmp_mul ; 259 nut->frame_code[i].size_lsb = tmp_size+j; 260 nut->frame_code[i].reserved_count = tmp_res ; 261 nut->frame_code[i].header_idx = tmp_head_idx; 262 } 263 } 264 assert(nut->frame_code['N'].flags == FLAG_INVALID); 265 266 if(end > avio_tell(bc) + 4){ 267 int rem= 1024; 268 GET_V(nut->header_count, tmp<128U) 269 nut->header_count++; 270 for(i=1; i<nut->header_count; i++){ 271 GET_V(nut->header_len[i], tmp>0 && tmp<256); 272 rem -= nut->header_len[i]; 273 if(rem < 0){ 274 av_log(s, AV_LOG_ERROR, "invalid elision header\n"); 275 return AVERROR_INVALIDDATA; 276 } 277 nut->header[i]= av_malloc(nut->header_len[i]); 278 avio_read(bc, nut->header[i], nut->header_len[i]); 279 } 280 assert(nut->header_len[0]==0); 281 } 282 283 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 284 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n"); 285 return AVERROR_INVALIDDATA; 286 } 287 288 nut->stream = av_mallocz(sizeof(StreamContext)*stream_count); 289 for(i=0; i<stream_count; i++){ 290 avformat_new_stream(s, NULL); 291 } 292 293 return 0; 294} 295 296static int decode_stream_header(NUTContext *nut){ 297 AVFormatContext *s= nut->avf; 298 AVIOContext *bc = s->pb; 299 StreamContext *stc; 300 int class, stream_id; 301 uint64_t tmp, end; 302 AVStream *st; 303 304 end= get_packetheader(nut, bc, 1, STREAM_STARTCODE); 305 end += avio_tell(bc); 306 307 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base); 308 stc= &nut->stream[stream_id]; 309 310 st = s->streams[stream_id]; 311 if (!st) 312 return AVERROR(ENOMEM); 313 314 class = ffio_read_varlen(bc); 315 tmp = get_fourcc(bc); 316 st->codec->codec_tag= tmp; 317 switch(class) 318 { 319 case 0: 320 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 321 st->codec->codec_id = av_codec_get_id( 322 (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, 0 }, 323 tmp); 324 break; 325 case 1: 326 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 327 st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, tmp); 328 break; 329 case 2: 330 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; 331 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp); 332 break; 333 case 3: 334 st->codec->codec_type = AVMEDIA_TYPE_DATA; 335 break; 336 default: 337 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class); 338 return -1; 339 } 340 if(class<3 && st->codec->codec_id == CODEC_ID_NONE) 341 av_log(s, AV_LOG_ERROR, "Unknown codec tag '0x%04x' for stream number %d\n", 342 (unsigned int)tmp, stream_id); 343 344 GET_V(stc->time_base_id , tmp < nut->time_base_count); 345 GET_V(stc->msb_pts_shift , tmp < 16); 346 stc->max_pts_distance= ffio_read_varlen(bc); 347 GET_V(stc->decode_delay , tmp < 1000); //sanity limit, raise this if Moore's law is true 348 st->codec->has_b_frames= stc->decode_delay; 349 ffio_read_varlen(bc); //stream flags 350 351 GET_V(st->codec->extradata_size, tmp < (1<<30)); 352 if(st->codec->extradata_size){ 353 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); 354 avio_read(bc, st->codec->extradata, st->codec->extradata_size); 355 } 356 357 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO){ 358 GET_V(st->codec->width , tmp > 0) 359 GET_V(st->codec->height, tmp > 0) 360 st->sample_aspect_ratio.num= ffio_read_varlen(bc); 361 st->sample_aspect_ratio.den= ffio_read_varlen(bc); 362 if((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)){ 363 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", st->sample_aspect_ratio.num, st->sample_aspect_ratio.den); 364 return -1; 365 } 366 ffio_read_varlen(bc); /* csp type */ 367 }else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO){ 368 GET_V(st->codec->sample_rate , tmp > 0) 369 ffio_read_varlen(bc); // samplerate_den 370 GET_V(st->codec->channels, tmp > 0) 371 } 372 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 373 av_log(s, AV_LOG_ERROR, "stream header %d checksum mismatch\n", stream_id); 374 return -1; 375 } 376 stc->time_base= &nut->time_base[stc->time_base_id]; 377 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, stc->time_base->den); 378 return 0; 379} 380 381static void set_disposition_bits(AVFormatContext* avf, char* value, int stream_id){ 382 int flag = 0, i; 383 for (i=0; ff_nut_dispositions[i].flag; ++i) { 384 if (!strcmp(ff_nut_dispositions[i].str, value)) 385 flag = ff_nut_dispositions[i].flag; 386 } 387 if (!flag) 388 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value); 389 for (i = 0; i < avf->nb_streams; ++i) 390 if (stream_id == i || stream_id == -1) 391 avf->streams[i]->disposition |= flag; 392} 393 394static int decode_info_header(NUTContext *nut){ 395 AVFormatContext *s= nut->avf; 396 AVIOContext *bc = s->pb; 397 uint64_t tmp, chapter_start, chapter_len; 398 unsigned int stream_id_plus1, count; 399 int chapter_id, i; 400 int64_t value, end; 401 char name[256], str_value[1024], type_str[256]; 402 const char *type; 403 AVChapter *chapter= NULL; 404 AVStream *st= NULL; 405 AVDictionary **metadata = NULL; 406 407 end= get_packetheader(nut, bc, 1, INFO_STARTCODE); 408 end += avio_tell(bc); 409 410 GET_V(stream_id_plus1, tmp <= s->nb_streams) 411 chapter_id = get_s(bc); 412 chapter_start= ffio_read_varlen(bc); 413 chapter_len = ffio_read_varlen(bc); 414 count = ffio_read_varlen(bc); 415 416 if(chapter_id && !stream_id_plus1){ 417 int64_t start= chapter_start / nut->time_base_count; 418 chapter= avpriv_new_chapter(s, chapter_id, 419 nut->time_base[chapter_start % nut->time_base_count], 420 start, start + chapter_len, NULL); 421 metadata = &chapter->metadata; 422 } else if(stream_id_plus1) { 423 st= s->streams[stream_id_plus1 - 1]; 424 metadata = &st->metadata; 425 } else 426 metadata = &s->metadata; 427 428 for(i=0; i<count; i++){ 429 get_str(bc, name, sizeof(name)); 430 value= get_s(bc); 431 if(value == -1){ 432 type= "UTF-8"; 433 get_str(bc, str_value, sizeof(str_value)); 434 }else if(value == -2){ 435 get_str(bc, type_str, sizeof(type_str)); 436 type= type_str; 437 get_str(bc, str_value, sizeof(str_value)); 438 }else if(value == -3){ 439 type= "s"; 440 value= get_s(bc); 441 }else if(value == -4){ 442 type= "t"; 443 value= ffio_read_varlen(bc); 444 }else if(value < -4){ 445 type= "r"; 446 get_s(bc); 447 }else{ 448 type= "v"; 449 } 450 451 if (stream_id_plus1 > s->nb_streams) { 452 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n"); 453 continue; 454 } 455 456 if(!strcmp(type, "UTF-8")){ 457 if(chapter_id==0 && !strcmp(name, "Disposition")) { 458 set_disposition_bits(s, str_value, stream_id_plus1 - 1); 459 continue; 460 } 461 if(metadata && av_strcasecmp(name,"Uses") 462 && av_strcasecmp(name,"Depends") && av_strcasecmp(name,"Replaces")) 463 av_dict_set(metadata, name, str_value, 0); 464 } 465 } 466 467 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 468 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n"); 469 return -1; 470 } 471 return 0; 472} 473 474static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr){ 475 AVFormatContext *s= nut->avf; 476 AVIOContext *bc = s->pb; 477 int64_t end, tmp; 478 479 nut->last_syncpoint_pos= avio_tell(bc)-8; 480 481 end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE); 482 end += avio_tell(bc); 483 484 tmp= ffio_read_varlen(bc); 485 *back_ptr= nut->last_syncpoint_pos - 16*ffio_read_varlen(bc); 486 if(*back_ptr < 0) 487 return -1; 488 489 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], tmp / nut->time_base_count); 490 491 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 492 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n"); 493 return -1; 494 } 495 496 *ts= tmp / s->nb_streams * av_q2d(nut->time_base[tmp % s->nb_streams])*AV_TIME_BASE; 497 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts); 498 499 return 0; 500} 501 502static int find_and_decode_index(NUTContext *nut){ 503 AVFormatContext *s= nut->avf; 504 AVIOContext *bc = s->pb; 505 uint64_t tmp, end; 506 int i, j, syncpoint_count; 507 int64_t filesize= avio_size(bc); 508 int64_t *syncpoints; 509 int8_t *has_keyframe; 510 int ret= -1; 511 512 avio_seek(bc, filesize-12, SEEK_SET); 513 avio_seek(bc, filesize-avio_rb64(bc), SEEK_SET); 514 if(avio_rb64(bc) != INDEX_STARTCODE){ 515 av_log(s, AV_LOG_ERROR, "no index at the end\n"); 516 return -1; 517 } 518 519 end= get_packetheader(nut, bc, 1, INDEX_STARTCODE); 520 end += avio_tell(bc); 521 522 ffio_read_varlen(bc); //max_pts 523 GET_V(syncpoint_count, tmp < INT_MAX/8 && tmp > 0) 524 syncpoints= av_malloc(sizeof(int64_t)*syncpoint_count); 525 has_keyframe= av_malloc(sizeof(int8_t)*(syncpoint_count+1)); 526 for(i=0; i<syncpoint_count; i++){ 527 syncpoints[i] = ffio_read_varlen(bc); 528 if(syncpoints[i] <= 0) 529 goto fail; 530 if(i) 531 syncpoints[i] += syncpoints[i-1]; 532 } 533 534 for(i=0; i<s->nb_streams; i++){ 535 int64_t last_pts= -1; 536 for(j=0; j<syncpoint_count;){ 537 uint64_t x= ffio_read_varlen(bc); 538 int type= x&1; 539 int n= j; 540 x>>=1; 541 if(type){ 542 int flag= x&1; 543 x>>=1; 544 if(n+x >= syncpoint_count + 1){ 545 av_log(s, AV_LOG_ERROR, "index overflow A\n"); 546 goto fail; 547 } 548 while(x--) 549 has_keyframe[n++]= flag; 550 has_keyframe[n++]= !flag; 551 }else{ 552 while(x != 1){ 553 if(n>=syncpoint_count + 1){ 554 av_log(s, AV_LOG_ERROR, "index overflow B\n"); 555 goto fail; 556 } 557 has_keyframe[n++]= x&1; 558 x>>=1; 559 } 560 } 561 if(has_keyframe[0]){ 562 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n"); 563 goto fail; 564 } 565 assert(n<=syncpoint_count+1); 566 for(; j<n && j<syncpoint_count; j++){ 567 if(has_keyframe[j]){ 568 uint64_t B, A= ffio_read_varlen(bc); 569 if(!A){ 570 A= ffio_read_varlen(bc); 571 B= ffio_read_varlen(bc); 572 //eor_pts[j][i] = last_pts + A + B 573 }else 574 B= 0; 575 av_add_index_entry( 576 s->streams[i], 577 16*syncpoints[j-1], 578 last_pts + A, 579 0, 580 0, 581 AVINDEX_KEYFRAME); 582 last_pts += A + B; 583 } 584 } 585 } 586 } 587 588 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 589 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n"); 590 goto fail; 591 } 592 ret= 0; 593fail: 594 av_free(syncpoints); 595 av_free(has_keyframe); 596 return ret; 597} 598 599static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap) 600{ 601 NUTContext *nut = s->priv_data; 602 AVIOContext *bc = s->pb; 603 int64_t pos; 604 int initialized_stream_count; 605 606 nut->avf= s; 607 608 /* main header */ 609 pos=0; 610 do{ 611 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1; 612 if (pos<0+1){ 613 av_log(s, AV_LOG_ERROR, "No main startcode found.\n"); 614 return AVERROR_INVALIDDATA; 615 } 616 }while(decode_main_header(nut) < 0); 617 618 /* stream headers */ 619 pos=0; 620 for(initialized_stream_count=0; initialized_stream_count < s->nb_streams;){ 621 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1; 622 if (pos<0+1){ 623 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n"); 624 return AVERROR_INVALIDDATA; 625 } 626 if(decode_stream_header(nut) >= 0) 627 initialized_stream_count++; 628 } 629 630 /* info headers */ 631 pos=0; 632 for(;;){ 633 uint64_t startcode= find_any_startcode(bc, pos); 634 pos= avio_tell(bc); 635 636 if(startcode==0){ 637 av_log(s, AV_LOG_ERROR, "EOF before video frames\n"); 638 return AVERROR_INVALIDDATA; 639 }else if(startcode == SYNCPOINT_STARTCODE){ 640 nut->next_startcode= startcode; 641 break; 642 }else if(startcode != INFO_STARTCODE){ 643 continue; 644 } 645 646 decode_info_header(nut); 647 } 648 649 s->data_offset= pos-8; 650 651 if(bc->seekable){ 652 int64_t orig_pos= avio_tell(bc); 653 find_and_decode_index(nut); 654 avio_seek(bc, orig_pos, SEEK_SET); 655 } 656 assert(nut->next_startcode == SYNCPOINT_STARTCODE); 657 658 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv); 659 660 return 0; 661} 662 663static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, uint8_t *header_idx, int frame_code){ 664 AVFormatContext *s= nut->avf; 665 AVIOContext *bc = s->pb; 666 StreamContext *stc; 667 int size, flags, size_mul, pts_delta, i, reserved_count; 668 uint64_t tmp; 669 670 if(avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance){ 671 av_log(s, AV_LOG_ERROR, "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n", avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance); 672 return AVERROR_INVALIDDATA; 673 } 674 675 flags = nut->frame_code[frame_code].flags; 676 size_mul = nut->frame_code[frame_code].size_mul; 677 size = nut->frame_code[frame_code].size_lsb; 678 *stream_id = nut->frame_code[frame_code].stream_id; 679 pts_delta = nut->frame_code[frame_code].pts_delta; 680 reserved_count = nut->frame_code[frame_code].reserved_count; 681 *header_idx = nut->frame_code[frame_code].header_idx; 682 683 if(flags & FLAG_INVALID) 684 return AVERROR_INVALIDDATA; 685 if(flags & FLAG_CODED) 686 flags ^= ffio_read_varlen(bc); 687 if(flags & FLAG_STREAM_ID){ 688 GET_V(*stream_id, tmp < s->nb_streams) 689 } 690 stc= &nut->stream[*stream_id]; 691 if(flags&FLAG_CODED_PTS){ 692 int coded_pts= ffio_read_varlen(bc); 693//FIXME check last_pts validity? 694 if(coded_pts < (1<<stc->msb_pts_shift)){ 695 *pts=ff_lsb2full(stc, coded_pts); 696 }else 697 *pts=coded_pts - (1<<stc->msb_pts_shift); 698 }else 699 *pts= stc->last_pts + pts_delta; 700 if(flags&FLAG_SIZE_MSB){ 701 size += size_mul*ffio_read_varlen(bc); 702 } 703 if(flags&FLAG_MATCH_TIME) 704 get_s(bc); 705 if(flags&FLAG_HEADER_IDX) 706 *header_idx= ffio_read_varlen(bc); 707 if(flags&FLAG_RESERVED) 708 reserved_count= ffio_read_varlen(bc); 709 for(i=0; i<reserved_count; i++) 710 ffio_read_varlen(bc); 711 712 if(*header_idx >= (unsigned)nut->header_count){ 713 av_log(s, AV_LOG_ERROR, "header_idx invalid\n"); 714 return AVERROR_INVALIDDATA; 715 } 716 if(size > 4096) 717 *header_idx=0; 718 size -= nut->header_len[*header_idx]; 719 720 if(flags&FLAG_CHECKSUM){ 721 avio_rb32(bc); //FIXME check this 722 }else if(size > 2*nut->max_distance || FFABS(stc->last_pts - *pts) > stc->max_pts_distance){ 723 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n"); 724 return AVERROR_INVALIDDATA; 725 } 726 727 stc->last_pts= *pts; 728 stc->last_flags= flags; 729 730 return size; 731} 732 733static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){ 734 AVFormatContext *s= nut->avf; 735 AVIOContext *bc = s->pb; 736 int size, stream_id, discard; 737 int64_t pts, last_IP_pts; 738 StreamContext *stc; 739 uint8_t header_idx; 740 741 size= decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code); 742 if(size < 0) 743 return size; 744 745 stc= &nut->stream[stream_id]; 746 747 if (stc->last_flags & FLAG_KEY) 748 stc->skip_until_key_frame=0; 749 750 discard= s->streams[ stream_id ]->discard; 751 last_IP_pts= s->streams[ stream_id ]->last_IP_pts; 752 if( (discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) 753 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts) 754 || discard >= AVDISCARD_ALL 755 || stc->skip_until_key_frame){ 756 avio_skip(bc, size); 757 return 1; 758 } 759 760 av_new_packet(pkt, size + nut->header_len[header_idx]); 761 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]); 762 pkt->pos= avio_tell(bc); //FIXME 763 avio_read(bc, pkt->data + nut->header_len[header_idx], size); 764 765 pkt->stream_index = stream_id; 766 if (stc->last_flags & FLAG_KEY) 767 pkt->flags |= AV_PKT_FLAG_KEY; 768 pkt->pts = pts; 769 770 return 0; 771} 772 773static int nut_read_packet(AVFormatContext *s, AVPacket *pkt) 774{ 775 NUTContext *nut = s->priv_data; 776 AVIOContext *bc = s->pb; 777 int i, frame_code=0, ret, skip; 778 int64_t ts, back_ptr; 779 780 for(;;){ 781 int64_t pos= avio_tell(bc); 782 uint64_t tmp= nut->next_startcode; 783 nut->next_startcode=0; 784 785 if(tmp){ 786 pos-=8; 787 }else{ 788 frame_code = avio_r8(bc); 789 if(bc->eof_reached) 790 return -1; 791 if(frame_code == 'N'){ 792 tmp= frame_code; 793 for(i=1; i<8; i++) 794 tmp = (tmp<<8) + avio_r8(bc); 795 } 796 } 797 switch(tmp){ 798 case MAIN_STARTCODE: 799 case STREAM_STARTCODE: 800 case INDEX_STARTCODE: 801 skip= get_packetheader(nut, bc, 0, tmp); 802 avio_skip(bc, skip); 803 break; 804 case INFO_STARTCODE: 805 if(decode_info_header(nut)<0) 806 goto resync; 807 break; 808 case SYNCPOINT_STARTCODE: 809 if(decode_syncpoint(nut, &ts, &back_ptr)<0) 810 goto resync; 811 frame_code = avio_r8(bc); 812 case 0: 813 ret= decode_frame(nut, pkt, frame_code); 814 if(ret==0) 815 return 0; 816 else if(ret==1) //ok but discard packet 817 break; 818 default: 819resync: 820av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos); 821 tmp= find_any_startcode(bc, nut->last_syncpoint_pos+1); 822 if(tmp==0) 823 return AVERROR_INVALIDDATA; 824av_log(s, AV_LOG_DEBUG, "sync\n"); 825 nut->next_startcode= tmp; 826 } 827 } 828} 829 830static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){ 831 NUTContext *nut = s->priv_data; 832 AVIOContext *bc = s->pb; 833 int64_t pos, pts, back_ptr; 834av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit); 835 836 pos= *pos_arg; 837 do{ 838 pos= find_startcode(bc, SYNCPOINT_STARTCODE, pos)+1; 839 if(pos < 1){ 840 assert(nut->next_startcode == 0); 841 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n"); 842 return AV_NOPTS_VALUE; 843 } 844 }while(decode_syncpoint(nut, &pts, &back_ptr) < 0); 845 *pos_arg = pos-1; 846 assert(nut->last_syncpoint_pos == *pos_arg); 847 848 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts,back_ptr ); 849 if (stream_index == -1) return pts; 850 else if(stream_index == -2) return back_ptr; 851 852assert(0); 853} 854 855static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags){ 856 NUTContext *nut = s->priv_data; 857 AVStream *st= s->streams[stream_index]; 858 Syncpoint dummy={.ts= pts*av_q2d(st->time_base)*AV_TIME_BASE}; 859 Syncpoint nopts_sp= {.ts= AV_NOPTS_VALUE, .back_ptr= AV_NOPTS_VALUE}; 860 Syncpoint *sp, *next_node[2]= {&nopts_sp, &nopts_sp}; 861 int64_t pos, pos2, ts; 862 int i; 863 864 if(st->index_entries){ 865 int index= av_index_search_timestamp(st, pts, flags); 866 if(index<0) 867 return -1; 868 869 pos2= st->index_entries[index].pos; 870 ts = st->index_entries[index].timestamp; 871 }else{ 872 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp, 873 (void **) next_node); 874 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", next_node[0]->pos, next_node[1]->pos, 875 next_node[0]->ts , next_node[1]->ts); 876 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos, next_node[1]->pos, next_node[1]->pos, 877 next_node[0]->ts , next_node[1]->ts, AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp); 878 879 if(!(flags & AVSEEK_FLAG_BACKWARD)){ 880 dummy.pos= pos+16; 881 next_node[1]= &nopts_sp; 882 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, 883 (void **) next_node); 884 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos , next_node[1]->pos, next_node[1]->pos, 885 next_node[0]->back_ptr, next_node[1]->back_ptr, flags, &ts, nut_read_timestamp); 886 if(pos2>=0) 887 pos= pos2; 888 //FIXME dir but I think it does not matter 889 } 890 dummy.pos= pos; 891 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, 892 NULL); 893 894 assert(sp); 895 pos2= sp->back_ptr - 15; 896 } 897 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2); 898 pos= find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2); 899 avio_seek(s->pb, pos, SEEK_SET); 900 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos); 901 if(pos2 > pos || pos2 + 15 < pos){ 902 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n"); 903 } 904 for(i=0; i<s->nb_streams; i++) 905 nut->stream[i].skip_until_key_frame=1; 906 907 return 0; 908} 909 910static int nut_read_close(AVFormatContext *s) 911{ 912 NUTContext *nut = s->priv_data; 913 int i; 914 915 av_freep(&nut->time_base); 916 av_freep(&nut->stream); 917 ff_nut_free_sp(nut); 918 for(i = 1; i < nut->header_count; i++) 919 av_freep(&nut->header[i]); 920 921 return 0; 922} 923 924#if CONFIG_NUT_DEMUXER 925AVInputFormat ff_nut_demuxer = { 926 .name = "nut", 927 .long_name = NULL_IF_CONFIG_SMALL("NUT format"), 928 .priv_data_size = sizeof(NUTContext), 929 .read_probe = nut_probe, 930 .read_header = nut_read_header, 931 .read_packet = nut_read_packet, 932 .read_close = nut_read_close, 933 .read_seek = read_seek, 934 .extensions = "nut", 935 .codec_tag = (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 }, 936}; 937#endif 938