1/* 2 * Windows Television (WTV) demuxer 3 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * Windows Television (WTV) demuxer 25 * @author Peter Ross <pross@xvid.org> 26 */ 27 28#include <inttypes.h> 29 30#include "libavutil/channel_layout.h" 31#include "libavutil/intreadwrite.h" 32#include "libavutil/intfloat.h" 33#include "libavutil/time_internal.h" 34#include "avformat.h" 35#include "demux.h" 36#include "internal.h" 37#include "wtv.h" 38#include "mpegts.h" 39 40/* Macros for formatting GUIDs */ 41#define PRI_PRETTY_GUID \ 42 "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x" 43#define ARG_PRETTY_GUID(g) \ 44 AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15] 45#define LEN_PRETTY_GUID 34 46 47/* 48 * File system routines 49 */ 50 51typedef struct WtvFile { 52 AVIOContext *pb_filesystem; /**< file system (AVFormatContext->pb) */ 53 54 int sector_bits; /**< sector shift bits; used to convert sector number into pb_filesystem offset */ 55 uint32_t *sectors; /**< file allocation table */ 56 int nb_sectors; /**< number of sectors */ 57 58 int error; 59 int64_t position; 60 int64_t length; 61} WtvFile; 62 63static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset) 64{ 65 return avio_seek(pb, (sector << WTV_SECTOR_BITS) + offset, SEEK_SET); 66} 67 68/** 69 * @return bytes read, AVERROR_EOF on end of file, or <0 on error 70 */ 71static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size) 72{ 73 WtvFile *wf = opaque; 74 AVIOContext *pb = wf->pb_filesystem; 75 int nread = 0, n = 0; 76 77 if (wf->error || pb->error) 78 return -1; 79 if (wf->position >= wf->length || avio_feof(pb)) 80 return AVERROR_EOF; 81 82 buf_size = FFMIN(buf_size, wf->length - wf->position); 83 while(nread < buf_size) { 84 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1)); 85 int read_request = FFMIN(buf_size - nread, remaining_in_sector); 86 87 n = avio_read(pb, buf, read_request); 88 if (n <= 0) 89 break; 90 nread += n; 91 buf += n; 92 wf->position += n; 93 if (n == remaining_in_sector) { 94 int i = wf->position >> wf->sector_bits; 95 if (i >= wf->nb_sectors || 96 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) && 97 seek_by_sector(pb, wf->sectors[i], 0) < 0)) { 98 wf->error = 1; 99 break; 100 } 101 } 102 } 103 return nread ? nread : n; 104} 105 106/** 107 * @return position (or file length) 108 */ 109static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence) 110{ 111 WtvFile *wf = opaque; 112 AVIOContext *pb = wf->pb_filesystem; 113 114 if (whence == AVSEEK_SIZE) 115 return wf->length; 116 else if (whence == SEEK_CUR) 117 offset = wf->position + offset; 118 else if (whence == SEEK_END) 119 offset = wf->length; 120 121 wf->error = offset < 0 || offset >= wf->length || 122 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits], 123 offset & ((1 << wf->sector_bits) - 1)) < 0; 124 wf->position = offset; 125 return offset; 126} 127 128/** 129 * read non-zero integers (le32) from input stream 130 * @param pb 131 * @param[out] data destination 132 * @param count maximum number of integers to read 133 * @return total number of integers read 134 */ 135static int read_ints(AVIOContext *pb, uint32_t *data, int count) 136{ 137 int i, total = 0; 138 for (i = 0; i < count; i++) { 139 if ((data[total] = avio_rl32(pb))) 140 total++; 141 } 142 return total; 143} 144 145/** 146 * Open file 147 * @param first_sector First sector 148 * @param length Length of file (bytes) 149 * @param depth File allocation table depth 150 * @return NULL on error 151 */ 152static AVIOContext * wtvfile_open_sector(unsigned first_sector, uint64_t length, int depth, AVFormatContext *s) 153{ 154 AVIOContext *pb; 155 WtvFile *wf; 156 uint8_t *buffer; 157 int64_t size; 158 159 if (seek_by_sector(s->pb, first_sector, 0) < 0) 160 return NULL; 161 162 wf = av_mallocz(sizeof(WtvFile)); 163 if (!wf) 164 return NULL; 165 166 if (depth == 0) { 167 wf->sectors = av_malloc(sizeof(uint32_t)); 168 if (!wf->sectors) { 169 av_free(wf); 170 return NULL; 171 } 172 wf->sectors[0] = first_sector; 173 wf->nb_sectors = 1; 174 } else if (depth == 1) { 175 wf->sectors = av_malloc(WTV_SECTOR_SIZE); 176 if (!wf->sectors) { 177 av_free(wf); 178 return NULL; 179 } 180 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4); 181 } else if (depth == 2) { 182 uint32_t sectors1[WTV_SECTOR_SIZE / 4]; 183 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4); 184 int i; 185 186 wf->sectors = av_malloc_array(nb_sectors1, 1 << WTV_SECTOR_BITS); 187 if (!wf->sectors) { 188 av_free(wf); 189 return NULL; 190 } 191 wf->nb_sectors = 0; 192 for (i = 0; i < nb_sectors1; i++) { 193 if (seek_by_sector(s->pb, sectors1[i], 0) < 0) 194 break; 195 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4); 196 } 197 } else { 198 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth); 199 av_free(wf); 200 return NULL; 201 } 202 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS; 203 204 if (!wf->nb_sectors) { 205 av_freep(&wf->sectors); 206 av_freep(&wf); 207 return NULL; 208 } 209 210 size = avio_size(s->pb); 211 if (size >= 0 && (int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > size) 212 av_log(s, AV_LOG_WARNING, "truncated file\n"); 213 214 /* check length */ 215 length &= 0xFFFFFFFFFFFF; 216 if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) { 217 av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits); 218 length = (int64_t)wf->nb_sectors << wf->sector_bits; 219 } 220 wf->length = length; 221 222 /* seek to initial sector */ 223 wf->position = 0; 224 if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) { 225 av_freep(&wf->sectors); 226 av_freep(&wf); 227 return NULL; 228 } 229 230 wf->pb_filesystem = s->pb; 231 buffer = av_malloc(1 << wf->sector_bits); 232 if (!buffer) { 233 av_freep(&wf->sectors); 234 av_freep(&wf); 235 return NULL; 236 } 237 238 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf, 239 wtvfile_read_packet, NULL, wtvfile_seek); 240 if (!pb) { 241 av_freep(&buffer); 242 av_freep(&wf->sectors); 243 av_freep(&wf); 244 } 245 return pb; 246} 247 248/** 249 * Open file using filename 250 * @param[in] buf directory buffer 251 * @param buf_size directory buffer size 252 * @param[in] filename 253 * @param filename_size size of filename 254 * @return NULL on error 255 */ 256static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size) 257{ 258 const uint8_t *buf_end = buf + buf_size; 259 260 while(buf + 48 <= buf_end) { 261 int dir_length, name_size, first_sector, depth; 262 uint64_t file_length; 263 const uint8_t *name; 264 if (ff_guidcmp(buf, ff_dir_entry_guid)) { 265 av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; " 266 "remaining directory entries ignored\n", FF_ARG_GUID(buf)); 267 break; 268 } 269 dir_length = AV_RL16(buf + 16); 270 file_length = AV_RL64(buf + 24); 271 name_size = 2 * AV_RL32(buf + 32); 272 if (name_size < 0) { 273 av_log(s, AV_LOG_ERROR, 274 "bad filename length, remaining directory entries ignored\n"); 275 break; 276 } 277 if (dir_length == 0) { 278 av_log(s, AV_LOG_ERROR, 279 "bad dir length, remaining directory entries ignored\n"); 280 break; 281 } 282 if (48 + (int64_t)name_size > buf_end - buf) { 283 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n"); 284 break; 285 } 286 first_sector = AV_RL32(buf + 40 + name_size); 287 depth = AV_RL32(buf + 44 + name_size); 288 289 /* compare file name; test optional null terminator */ 290 name = buf + 40; 291 if (name_size >= filename_size && 292 !memcmp(name, filename, filename_size) && 293 (name_size < filename_size + 2 || !AV_RN16(name + filename_size))) 294 return wtvfile_open_sector(first_sector, file_length, depth, s); 295 296 buf += dir_length; 297 } 298 return NULL; 299} 300 301#define wtvfile_open(s, buf, buf_size, filename) \ 302 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename)) 303 304/** 305 * Close file opened with wtvfile_open_sector(), or wtv_open() 306 */ 307static void wtvfile_close(AVIOContext *pb) 308{ 309 WtvFile *wf = pb->opaque; 310 av_freep(&wf->sectors); 311 av_freep(&pb->opaque); 312 av_freep(&pb->buffer); 313 avio_context_free(&pb); 314} 315 316/* 317 * Main demuxer 318 */ 319 320typedef struct WtvStream { 321 int seen_data; 322} WtvStream; 323 324typedef struct WtvContext { 325 AVIOContext *pb; /**< timeline file */ 326 int64_t epoch; 327 int64_t pts; /**< pts for next data chunk */ 328 int64_t last_valid_pts; /**< latest valid pts, used for interactive seeking */ 329 330 /* maintain private seek index, as the AVIndexEntry->pos is relative to the 331 start of the 'timeline' file, not the file system (AVFormatContext->pb) */ 332 AVIndexEntry *index_entries; 333 int nb_index_entries; 334 unsigned int index_entries_allocated_size; 335} WtvContext; 336 337/* WTV GUIDs */ 338static const ff_asf_guid EVENTID_SubtitleSpanningEvent = 339 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A}; 340static const ff_asf_guid EVENTID_LanguageSpanningEvent = 341 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95}; 342static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent = 343 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E}; 344static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent = 345 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24}; 346static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent = 347 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66}; 348static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent = 349 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B}; 350static const ff_asf_guid EVENTID_StreamIDSpanningEvent = 351 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE}; 352static const ff_asf_guid EVENTID_TeletextSpanningEvent = 353 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3}; 354static const ff_asf_guid EVENTID_AudioTypeSpanningEvent = 355 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3}; 356 357/* Windows media GUIDs */ 358 359/* Media types */ 360static const ff_asf_guid mediasubtype_mpeg1payload = 361 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70}; 362static const ff_asf_guid mediatype_mpeg2_sections = 363 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5}; 364static const ff_asf_guid mediatype_mpeg2_pes = 365 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}; 366static const ff_asf_guid mediatype_mstvcaption = 367 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1}; 368 369/* Media subtypes */ 370static const ff_asf_guid mediasubtype_dvb_subtitle = 371 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F}; 372static const ff_asf_guid mediasubtype_teletext = 373 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA}; 374static const ff_asf_guid mediasubtype_dtvccdata = 375 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A}; 376static const ff_asf_guid mediasubtype_mpeg2_sections = 377 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61}; 378 379static int read_probe(const AVProbeData *p) 380{ 381 return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX; 382} 383 384/** 385 * Convert win32 FILETIME to ISO-8601 string 386 * @return <0 on error 387 */ 388static int filetime_to_iso8601(char *buf, int buf_size, int64_t value) 389{ 390 time_t t = (value / 10000000LL) - 11644473600LL; 391 struct tm tmbuf; 392 struct tm *tm = gmtime_r(&t, &tmbuf); 393 if (!tm) 394 return -1; 395 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm)) 396 return -1; 397 return 0; 398} 399 400/** 401 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string 402 * @return <0 on error 403 */ 404static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value) 405{ 406 time_t t = (value / 10000000LL) - 719162LL*86400LL; 407 struct tm tmbuf; 408 struct tm *tm = gmtime_r(&t, &tmbuf); 409 if (!tm) 410 return -1; 411 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm)) 412 return -1; 413 return 0; 414} 415 416/** 417 * Convert OLE DATE to ISO-8601 string 418 * @return <0 on error 419 */ 420static int oledate_to_iso8601(char *buf, int buf_size, int64_t value) 421{ 422 time_t t = (av_int2double(value) - 25569.0) * 86400; 423 struct tm tmbuf; 424 struct tm *tm= gmtime_r(&t, &tmbuf); 425 if (!tm) 426 return -1; 427 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm)) 428 return -1; 429 return 0; 430} 431 432static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length) 433{ 434 char mime[1024]; 435 char description[1024]; 436 unsigned int filesize; 437 AVStream *st; 438 int64_t pos = avio_tell(pb); 439 440 avio_get_str16le(pb, INT_MAX, mime, sizeof(mime)); 441 if (strcmp(mime, "image/jpeg")) 442 goto done; 443 444 avio_r8(pb); 445 avio_get_str16le(pb, INT_MAX, description, sizeof(description)); 446 filesize = avio_rl32(pb); 447 if (!filesize) 448 goto done; 449 450 if (ff_add_attached_pic(s, NULL, pb, NULL, filesize) < 0) 451 goto done; 452 st = s->streams[s->nb_streams - 1]; 453 av_dict_set(&st->metadata, "title", description, 0); 454 st->codecpar->codec_id = AV_CODEC_ID_MJPEG; 455 st->id = -1; 456done: 457 avio_seek(pb, pos + length, SEEK_SET); 458} 459 460static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length) 461{ 462 int buf_size; 463 char *buf; 464 465 if (!strcmp(key, "WM/MediaThumbType")) { 466 avio_skip(pb, length); 467 return; 468 } 469 470 buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1; 471 buf = av_malloc(buf_size); 472 if (!buf) 473 return; 474 475 if (type == 0 && length == 4) { 476 snprintf(buf, buf_size, "%u", avio_rl32(pb)); 477 } else if (type == 1) { 478 avio_get_str16le(pb, length, buf, buf_size); 479 if (!strlen(buf)) { 480 av_free(buf); 481 return; 482 } 483 } else if (type == 3 && length == 4) { 484 strcpy(buf, avio_rl32(pb) ? "true" : "false"); 485 } else if (type == 4 && length == 8) { 486 int64_t num = avio_rl64(pb); 487 if (!strcmp(key, "WM/EncodingTime") || 488 !strcmp(key, "WM/MediaOriginalBroadcastDateTime")) { 489 if (filetime_to_iso8601(buf, buf_size, num) < 0) { 490 av_free(buf); 491 return; 492 } 493 } else if (!strcmp(key, "WM/WMRVEncodeTime") || 494 !strcmp(key, "WM/WMRVEndTime")) { 495 if (crazytime_to_iso8601(buf, buf_size, num) < 0) { 496 av_free(buf); 497 return; 498 } 499 } else if (!strcmp(key, "WM/WMRVExpirationDate")) { 500 if (oledate_to_iso8601(buf, buf_size, num) < 0 ) { 501 av_free(buf); 502 return; 503 } 504 } else if (!strcmp(key, "WM/WMRVBitrate")) 505 snprintf(buf, buf_size, "%f", av_int2double(num)); 506 else 507 snprintf(buf, buf_size, "%"PRIi64, num); 508 } else if (type == 5 && length == 2) { 509 snprintf(buf, buf_size, "%u", avio_rl16(pb)); 510 } else if (type == 6 && length == 16) { 511 ff_asf_guid guid; 512 avio_read(pb, guid, 16); 513 snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid)); 514 } else if (type == 2 && !strcmp(key, "WM/Picture")) { 515 get_attachment(s, pb, length); 516 av_freep(&buf); 517 return; 518 } else { 519 av_freep(&buf); 520 av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length); 521 avio_skip(pb, length); 522 return; 523 } 524 525 av_dict_set(&s->metadata, key, buf, 0); 526 av_freep(&buf); 527} 528 529/** 530 * Parse metadata entries 531 */ 532static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb) 533{ 534 ff_asf_guid guid; 535 int length, type; 536 while(!avio_feof(pb)) { 537 char key[1024]; 538 ff_get_guid(pb, &guid); 539 type = avio_rl32(pb); 540 length = avio_rl32(pb); 541 if (!length) 542 break; 543 if (ff_guidcmp(&guid, ff_metadata_guid)) { 544 av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; " 545 "remaining metadata entries ignored\n", FF_ARG_GUID(guid)); 546 break; 547 } 548 avio_get_str16le(pb, INT_MAX, key, sizeof(key)); 549 get_tag(s, pb, key, type, length); 550 } 551 552 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv); 553} 554 555/** 556 * parse VIDEOINFOHEADER2 structure 557 * @return bytes consumed 558 */ 559static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st) 560{ 561 WtvContext *wtv = s->priv_data; 562 AVIOContext *pb = wtv->pb; 563 564 avio_skip(pb, 72); // picture aspect ratio is unreliable 565 st->codecpar->codec_tag = ff_get_bmp_header(pb, st, NULL); 566 567 return 72 + 40; 568} 569 570/** 571 * Parse MPEG1WAVEFORMATEX extradata structure 572 */ 573static void parse_mpeg1waveformatex(AVStream *st) 574{ 575 /* fwHeadLayer */ 576 switch (AV_RL16(st->codecpar->extradata)) { 577 case 0x0001 : st->codecpar->codec_id = AV_CODEC_ID_MP1; break; 578 case 0x0002 : st->codecpar->codec_id = AV_CODEC_ID_MP2; break; 579 case 0x0004 : st->codecpar->codec_id = AV_CODEC_ID_MP3; break; 580 } 581 582 st->codecpar->bit_rate = AV_RL32(st->codecpar->extradata + 2); /* dwHeadBitrate */ 583 584 /* dwHeadMode */ 585 switch (AV_RL16(st->codecpar->extradata + 6)) { 586 case 1 : 587 case 2 : 588 case 4 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; 589 break; 590 case 8 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; 591 break; 592 } 593} 594 595/** 596 * Initialise stream 597 * @param st Stream to initialise, or NULL to create and initialise new stream 598 * @return NULL on error 599 */ 600static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type) 601{ 602 if (st) { 603 if (st->codecpar->extradata) { 604 av_freep(&st->codecpar->extradata); 605 st->codecpar->extradata_size = 0; 606 } 607 } else { 608 WtvStream *wst = av_mallocz(sizeof(WtvStream)); 609 if (!wst) 610 return NULL; 611 st = avformat_new_stream(s, NULL); 612 if (!st) { 613 av_free(wst); 614 return NULL; 615 } 616 st->id = sid; 617 st->priv_data = wst; 618 } 619 st->codecpar->codec_type = codec_type; 620 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL; 621 avpriv_set_pts_info(st, 64, 1, 10000000); 622 return st; 623} 624 625/** 626 * parse Media Type structure and populate stream 627 * @param st Stream, or NULL to create new stream 628 * @param mediatype Mediatype GUID 629 * @param subtype Subtype GUID 630 * @param formattype Format GUID 631 * @param size Size of format buffer 632 * @return NULL on error 633 */ 634static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid, 635 ff_asf_guid mediatype, ff_asf_guid subtype, 636 ff_asf_guid formattype, uint64_t size) 637{ 638 WtvContext *wtv = s->priv_data; 639 AVIOContext *pb = wtv->pb; 640 if (!ff_guidcmp(subtype, ff_mediasubtype_cpfilters_processed) && 641 !ff_guidcmp(formattype, ff_format_cpfilters_processed)) { 642 ff_asf_guid actual_subtype; 643 ff_asf_guid actual_formattype; 644 645 if (size < 32) { 646 av_log(s, AV_LOG_WARNING, "format buffer size underflow\n"); 647 avio_skip(pb, size); 648 return NULL; 649 } 650 651 avio_skip(pb, size - 32); 652 ff_get_guid(pb, &actual_subtype); 653 ff_get_guid(pb, &actual_formattype); 654 if (avio_feof(pb)) 655 return NULL; 656 avio_seek(pb, -size, SEEK_CUR); 657 658 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32); 659 avio_skip(pb, 32); 660 return st; 661 } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) { 662 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO); 663 if (!st) 664 return NULL; 665 if (!ff_guidcmp(formattype, ff_format_waveformatex)) { 666 int ret = ff_get_wav_header(s, pb, st->codecpar, size, 0); 667 if (ret < 0) 668 return NULL; 669 } else { 670 if (ff_guidcmp(formattype, ff_format_none)) 671 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype)); 672 avio_skip(pb, size); 673 } 674 675 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) { 676 st->codecpar->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codecpar->bits_per_coded_sample); 677 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) { 678 if (st->codecpar->extradata && st->codecpar->extradata_size >= 22) 679 parse_mpeg1waveformatex(st); 680 else 681 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n"); 682 } else { 683 st->codecpar->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype); 684 if (st->codecpar->codec_id == AV_CODEC_ID_NONE) 685 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype)); 686 } 687 return st; 688 } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) { 689 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO); 690 if (!st) 691 return NULL; 692 if (!ff_guidcmp(formattype, ff_format_videoinfo2)) { 693 int consumed = parse_videoinfoheader2(s, st); 694 avio_skip(pb, FFMAX(size - consumed, 0)); 695 } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) { 696 uint64_t consumed = parse_videoinfoheader2(s, st); 697 /* ignore extradata; files produced by windows media center contain meaningless mpeg1 sequence header */ 698 avio_skip(pb, FFMAX(size - consumed, 0)); 699 } else { 700 if (ff_guidcmp(formattype, ff_format_none)) 701 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype)); 702 avio_skip(pb, size); 703 } 704 705 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) { 706 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype)); 707 } else { 708 st->codecpar->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype); 709 } 710 if (st->codecpar->codec_id == AV_CODEC_ID_NONE) 711 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype)); 712 return st; 713 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) && 714 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) { 715 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE); 716 if (!st) 717 return NULL; 718 if (ff_guidcmp(formattype, ff_format_none)) 719 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype)); 720 avio_skip(pb, size); 721 st->codecpar->codec_id = AV_CODEC_ID_DVB_SUBTITLE; 722 return st; 723 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) && 724 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) { 725 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE); 726 if (!st) 727 return NULL; 728 if (ff_guidcmp(formattype, ff_format_none)) 729 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype)); 730 avio_skip(pb, size); 731 st->codecpar->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608; 732 return st; 733 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) && 734 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) { 735 if (ff_guidcmp(formattype, ff_format_none)) 736 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype)); 737 avio_skip(pb, size); 738 return NULL; 739 } 740 741 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID 742 ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n", 743 FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype)); 744 avio_skip(pb, size); 745 return NULL; 746} 747 748enum { 749 SEEK_TO_DATA = 0, 750 SEEK_TO_PTS, 751}; 752 753/** 754 * Try to seek over a broken chunk 755 * @return <0 on error 756 */ 757static int recover(WtvContext *wtv, uint64_t broken_pos) 758{ 759 AVIOContext *pb = wtv->pb; 760 int i; 761 for (i = 0; i < wtv->nb_index_entries; i++) { 762 if (wtv->index_entries[i].pos > broken_pos) { 763 int64_t ret = avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET); 764 if (ret < 0) 765 return ret; 766 wtv->pts = wtv->index_entries[i].timestamp; 767 return 0; 768 } 769 } 770 return AVERROR(EIO); 771} 772 773/** 774 * Parse WTV chunks 775 * @param mode SEEK_TO_DATA or SEEK_TO_PTS 776 * @param seekts timestamp 777 * @param[out] len_ptr Length of data chunk 778 * @return stream index of data chunk, or <0 on error 779 */ 780static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr) 781{ 782 WtvContext *wtv = s->priv_data; 783 AVIOContext *pb = wtv->pb; 784 while (!avio_feof(pb)) { 785 ff_asf_guid g; 786 int len, sid, consumed; 787 788 ff_get_guid(pb, &g); 789 len = avio_rl32(pb); 790 if (len < 32 || len > INT_MAX - 7) { 791 int ret; 792 if (avio_feof(pb)) 793 return AVERROR_EOF; 794 av_log(s, AV_LOG_WARNING, "encountered broken chunk\n"); 795 if ((ret = recover(wtv, avio_tell(pb) - 20)) < 0) 796 return ret; 797 continue; 798 } 799 sid = avio_rl32(pb) & 0x7FFF; 800 avio_skip(pb, 8); 801 consumed = 32; 802 803 if (!ff_guidcmp(g, ff_SBE2_STREAM_DESC_EVENT)) { 804 if (ff_find_stream_index(s, sid) < 0) { 805 ff_asf_guid mediatype, subtype, formattype; 806 int size; 807 avio_skip(pb, 28); 808 ff_get_guid(pb, &mediatype); 809 ff_get_guid(pb, &subtype); 810 avio_skip(pb, 12); 811 ff_get_guid(pb, &formattype); 812 size = avio_rl32(pb); 813 if (size < 0 || size > INT_MAX - 92 - consumed) 814 return AVERROR_INVALIDDATA; 815 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size); 816 consumed += 92 + size; 817 } 818 } else if (!ff_guidcmp(g, ff_stream2_guid)) { 819 int stream_index = ff_find_stream_index(s, sid); 820 if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) { 821 ff_asf_guid mediatype, subtype, formattype; 822 int size; 823 avio_skip(pb, 12); 824 ff_get_guid(pb, &mediatype); 825 ff_get_guid(pb, &subtype); 826 avio_skip(pb, 12); 827 ff_get_guid(pb, &formattype); 828 size = avio_rl32(pb); 829 if (size < 0 || size > INT_MAX - 76 - consumed) 830 return AVERROR_INVALIDDATA; 831 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size); 832 consumed += 76 + size; 833 } 834 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) || 835 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) || 836 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) || 837 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) || 838 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) || 839 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) { 840 int stream_index = ff_find_stream_index(s, sid); 841 if (stream_index >= 0) { 842 AVStream *st = s->streams[stream_index]; 843 uint8_t buf[258]; 844 const uint8_t *pbuf = buf; 845 int buf_size; 846 847 avio_skip(pb, 8); 848 consumed += 8; 849 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) || 850 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) { 851 avio_skip(pb, 6); 852 consumed += 6; 853 } 854 855 buf_size = FFMIN(len - consumed, sizeof(buf)); 856 avio_read(pb, buf, buf_size); 857 consumed += buf_size; 858 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL); 859 } 860 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) { 861 int stream_index = ff_find_stream_index(s, sid); 862 if (stream_index >= 0) { 863 AVStream *st = s->streams[stream_index]; 864 int audio_type; 865 avio_skip(pb, 8); 866 audio_type = avio_r8(pb); 867 if (audio_type == 2) 868 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; 869 else if (audio_type == 3) 870 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; 871 consumed += 9; 872 } 873 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) { 874 int stream_index = ff_find_stream_index(s, sid); 875 if (stream_index >= 0) { 876 avio_skip(pb, 12); 877 if (avio_rl32(pb)) 878 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index); 879 consumed += 16; 880 } 881 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) { 882 int stream_index = ff_find_stream_index(s, sid); 883 if (stream_index >= 0) { 884 AVStream *st = s->streams[stream_index]; 885 uint8_t language[4]; 886 avio_skip(pb, 12); 887 avio_read(pb, language, 3); 888 if (language[0]) { 889 language[3] = 0; 890 av_dict_set(&st->metadata, "language", language, 0); 891 if (!strcmp(language, "nar") || !strcmp(language, "NAR")) 892 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; 893 } 894 consumed += 15; 895 } 896 } else if (!ff_guidcmp(g, ff_timestamp_guid)) { 897 int stream_index = ff_find_stream_index(s, sid); 898 if (stream_index >= 0) { 899 avio_skip(pb, 8); 900 wtv->pts = avio_rl64(pb); 901 consumed += 16; 902 if (wtv->pts == -1) 903 wtv->pts = AV_NOPTS_VALUE; 904 else { 905 wtv->last_valid_pts = wtv->pts; 906 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch) 907 wtv->epoch = wtv->pts; 908 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) { 909 avio_skip(pb, WTV_PAD8(len) - consumed); 910 return 0; 911 } 912 } 913 } 914 } else if (!ff_guidcmp(g, ff_data_guid)) { 915 int stream_index = ff_find_stream_index(s, sid); 916 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) { 917 WtvStream *wst = s->streams[stream_index]->priv_data; 918 wst->seen_data = 1; 919 if (len_ptr) { 920 *len_ptr = len; 921 } 922 return stream_index; 923 } 924 } else if (!ff_guidcmp(g, /* DSATTRIB_WMDRMProtectionInfo */ (const ff_asf_guid){0x83,0x95,0x74,0x40,0x9D,0x6B,0xEC,0x4E,0xB4,0x3C,0x67,0xA1,0x80,0x1E,0x1A,0x9B})) { 925 int stream_index = ff_find_stream_index(s, sid); 926 if (stream_index >= 0) 927 av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index); 928 } else if ( 929 !ff_guidcmp(g, /* DSATTRIB_CAPTURE_STREAMTIME */ (const ff_asf_guid){0x14,0x56,0x1A,0x0C,0xCD,0x30,0x40,0x4F,0xBC,0xBF,0xD0,0x3E,0x52,0x30,0x62,0x07}) || 930 !ff_guidcmp(g, /* DSATTRIB_PBDATAG_ATTRIBUTE */ (const ff_asf_guid){0x79,0x66,0xB5,0xE0,0xB9,0x12,0xCC,0x43,0xB7,0xDF,0x57,0x8C,0xAA,0x5A,0x7B,0x63}) || 931 !ff_guidcmp(g, /* DSATTRIB_PicSampleSeq */ (const ff_asf_guid){0x02,0xAE,0x5B,0x2F,0x8F,0x7B,0x60,0x4F,0x82,0xD6,0xE4,0xEA,0x2F,0x1F,0x4C,0x99}) || 932 !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) || 933 !ff_guidcmp(g, /* dvr_ms_vid_frame_rep_data */ (const ff_asf_guid){0xCC,0x32,0x64,0xDD,0x29,0xE2,0xDB,0x40,0x80,0xF6,0xD2,0x63,0x28,0xD2,0x76,0x1F}) || 934 !ff_guidcmp(g, /* EVENTID_ChannelChangeSpanningEvent */ (const ff_asf_guid){0xE5,0xC5,0x67,0x90,0x5C,0x4C,0x05,0x42,0x86,0xC8,0x7A,0xFE,0x20,0xFE,0x1E,0xFA}) || 935 !ff_guidcmp(g, /* EVENTID_ChannelInfoSpanningEvent */ (const ff_asf_guid){0x80,0x6D,0xF3,0x41,0x32,0x41,0xC2,0x4C,0xB1,0x21,0x01,0xA4,0x32,0x19,0xD8,0x1B}) || 936 !ff_guidcmp(g, /* EVENTID_ChannelTypeSpanningEvent */ (const ff_asf_guid){0x51,0x1D,0xAB,0x72,0xD2,0x87,0x9B,0x48,0xBA,0x11,0x0E,0x08,0xDC,0x21,0x02,0x43}) || 937 !ff_guidcmp(g, /* EVENTID_PIDListSpanningEvent */ (const ff_asf_guid){0x65,0x8F,0xFC,0x47,0xBB,0xE2,0x34,0x46,0x9C,0xEF,0xFD,0xBF,0xE6,0x26,0x1D,0x5C}) || 938 !ff_guidcmp(g, /* EVENTID_SignalAndServiceStatusSpanningEvent */ (const ff_asf_guid){0xCB,0xC5,0x68,0x80,0x04,0x3C,0x2B,0x49,0xB4,0x7D,0x03,0x08,0x82,0x0D,0xCE,0x51}) || 939 !ff_guidcmp(g, /* EVENTID_StreamTypeSpanningEvent */ (const ff_asf_guid){0xBC,0x2E,0xAF,0x82,0xA6,0x30,0x64,0x42,0xA8,0x0B,0xAD,0x2E,0x13,0x72,0xAC,0x60}) || 940 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) || 941 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) || 942 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) || 943 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) || 944 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) || 945 !ff_guidcmp(g, ff_index_guid) || 946 !ff_guidcmp(g, ff_sync_guid) || 947 !ff_guidcmp(g, ff_stream1_guid) || 948 !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) { 949 //ignore known guids 950 } else 951 av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g)); 952 953 if (avio_feof(pb)) 954 break; 955 956 avio_skip(pb, WTV_PAD8(len) - consumed); 957 } 958 return AVERROR_EOF; 959} 960 961static int read_header(AVFormatContext *s) 962{ 963 WtvContext *wtv = s->priv_data; 964 unsigned root_sector; 965 int root_size; 966 uint8_t root[WTV_SECTOR_SIZE]; 967 AVIOContext *pb; 968 int64_t timeline_pos; 969 int64_t ret; 970 971 wtv->epoch = 972 wtv->pts = 973 wtv->last_valid_pts = AV_NOPTS_VALUE; 974 975 /* read root directory sector */ 976 avio_skip(s->pb, 0x30); 977 root_size = avio_rl32(s->pb); 978 if (root_size > sizeof(root)) { 979 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n"); 980 return AVERROR_INVALIDDATA; 981 } 982 avio_skip(s->pb, 4); 983 root_sector = avio_rl32(s->pb); 984 985 ret = seek_by_sector(s->pb, root_sector, 0); 986 if (ret < 0) 987 return ret; 988 root_size = avio_read(s->pb, root, root_size); 989 if (root_size < 0) 990 return AVERROR_INVALIDDATA; 991 992 /* parse chunks up until first data chunk */ 993 wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16); 994 if (!wtv->pb) { 995 av_log(s, AV_LOG_ERROR, "timeline data missing\n"); 996 return AVERROR_INVALIDDATA; 997 } 998 999 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0); 1000 if (ret < 0) { 1001 wtvfile_close(wtv->pb); 1002 return ret; 1003 } 1004 avio_seek(wtv->pb, -32, SEEK_CUR); 1005 1006 timeline_pos = avio_tell(s->pb); // save before opening another file 1007 1008 /* read metadata */ 1009 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16); 1010 if (pb) { 1011 parse_legacy_attrib(s, pb); 1012 wtvfile_close(pb); 1013 } 1014 1015 s->ctx_flags |= AVFMTCTX_NOHEADER; // Needed for noStreams.wtv 1016 1017 /* read seek index */ 1018 if (s->nb_streams) { 1019 AVStream *st = s->streams[0]; 1020 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16); 1021 if (pb) { 1022 while(1) { 1023 uint64_t timestamp = avio_rl64(pb); 1024 uint64_t frame_nb = avio_rl64(pb); 1025 if (avio_feof(pb)) 1026 break; 1027 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size, 1028 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME); 1029 } 1030 wtvfile_close(pb); 1031 1032 if (wtv->nb_index_entries) { 1033 pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16); 1034 if (pb) { 1035 AVIndexEntry *e = wtv->index_entries; 1036 AVIndexEntry *e_end = wtv->index_entries + wtv->nb_index_entries - 1; 1037 uint64_t last_position = 0; 1038 while (1) { 1039 uint64_t frame_nb = avio_rl64(pb); 1040 uint64_t position = avio_rl64(pb); 1041 while (e <= e_end && frame_nb > e->size) { 1042 e->pos = last_position; 1043 e++; 1044 } 1045 if (avio_feof(pb)) 1046 break; 1047 last_position = position; 1048 } 1049 e_end->pos = last_position; 1050 wtvfile_close(pb); 1051 st->duration = e_end->timestamp; 1052 } 1053 } 1054 } 1055 } 1056 1057 avio_seek(s->pb, timeline_pos, SEEK_SET); 1058 return 0; 1059} 1060 1061static int read_packet(AVFormatContext *s, AVPacket *pkt) 1062{ 1063 WtvContext *wtv = s->priv_data; 1064 AVIOContext *pb = wtv->pb; 1065 int stream_index, len, ret; 1066 1067 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len); 1068 if (stream_index < 0) 1069 return stream_index; 1070 1071 ret = av_get_packet(pb, pkt, len - 32); 1072 if (ret < 0) 1073 return ret; 1074 pkt->stream_index = stream_index; 1075 pkt->pts = wtv->pts; 1076 avio_skip(pb, WTV_PAD8(len) - len); 1077 return 0; 1078} 1079 1080static int read_seek(AVFormatContext *s, int stream_index, 1081 int64_t ts, int flags) 1082{ 1083 WtvContext *wtv = s->priv_data; 1084 AVIOContext *pb = wtv->pb; 1085 AVStream *st = s->streams[0]; 1086 int64_t ts_relative; 1087 int i; 1088 1089 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE)) 1090 return AVERROR(ENOSYS); 1091 1092 /* timestamp adjustment is required because wtv->pts values are absolute, 1093 * whereas AVIndexEntry->timestamp values are relative to epoch. */ 1094 ts_relative = ts; 1095 if (wtv->epoch != AV_NOPTS_VALUE) 1096 ts_relative -= wtv->epoch; 1097 1098 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags); 1099 if (i < 0) { 1100 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) { 1101 if (avio_seek(pb, 0, SEEK_SET) < 0) 1102 return -1; 1103 } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) { 1104 if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0) 1105 return -1; 1106 } 1107 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0) 1108 return AVERROR(ERANGE); 1109 return 0; 1110 } 1111 if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0) 1112 return -1; 1113 wtv->pts = wtv->index_entries[i].timestamp; 1114 if (wtv->epoch != AV_NOPTS_VALUE) 1115 wtv->pts += wtv->epoch; 1116 wtv->last_valid_pts = wtv->pts; 1117 return 0; 1118} 1119 1120static int read_close(AVFormatContext *s) 1121{ 1122 WtvContext *wtv = s->priv_data; 1123 av_freep(&wtv->index_entries); 1124 wtvfile_close(wtv->pb); 1125 return 0; 1126} 1127 1128const AVInputFormat ff_wtv_demuxer = { 1129 .name = "wtv", 1130 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"), 1131 .priv_data_size = sizeof(WtvContext), 1132 .read_probe = read_probe, 1133 .read_header = read_header, 1134 .read_packet = read_packet, 1135 .read_seek = read_seek, 1136 .read_close = read_close, 1137 .flags = AVFMT_SHOW_IDS, 1138}; 1139