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   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 "libavutil/intreadwrite.h"
  29 #include "libavutil/intfloat_readwrite.h"
  30 #include "avformat.h"
  31 #include "internal.h"
  32 #include "riff.h"
  33 #include "asf.h"
  34 #include "mpegts.h"
  35 #include <strings.h>
  36
  37 /* Macros for formating GUIDs */
  38 #define PRI_PRETTY_GUID \
  39     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
  40 #define ARG_PRETTY_GUID(g) \
  41     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]
  42 #define LEN_PRETTY_GUID 34
  43
  44 /*
  45  *
  46  * File system routines
  47  *
  48  */
  49
  50 #define WTV_SECTOR_BITS    12
  51 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
  52 #define WTV_BIGSECTOR_BITS 18
  53
  54 typedef struct {
  55     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
  56
  57     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
  58     uint32_t *sectors;   /** file allocation table */
  59     int nb_sectors;      /** number of sectors */
  60
  61     int error;
  62     int64_t position;
  63     int64_t length;
  64 } WtvFile;
  65
  66 /**
  67  * @return bytes read, 0 on end of file, or <0 on error
  68  */
  69 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
  70 {
  71     WtvFile *wf = opaque;
  72     AVIOContext *pb = wf->pb_filesystem;
  73     int nread = 0;
  74
  75     if (wf->error || pb->error)
  76         return -1;
  77     if (wf->position >= wf->length || url_feof(pb))
  78         return 0;
  79
  80     buf_size = FFMIN(buf_size, wf->length - wf->position);
  81     while(nread < buf_size) {
  82         int n;
  83         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
  84         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
  85
  86         n = avio_read(pb, buf, read_request);
  87         if (n <= 0)
  88             break;
  89         nread += n;
  90         buf += n;
  91         wf->position += n;
  92         if (n == remaining_in_sector) {
  93             int i = wf->position >> wf->sector_bits;
  94             if (i >= wf->nb_sectors ||
  95                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
  96                 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
  97                 wf->error = 1;
  98                 break;
  99             }
 100         }
 101     }
 102     return nread;
 103 }
 104
 105 /**
 106  * @return position (or file length)
 107  */
 108 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
 109 {
 110     WtvFile *wf = opaque;
 111     AVIOContext *pb = wf->pb_filesystem;
 112
 113     if (whence == AVSEEK_SIZE)
 114         return wf->length;
 115     else if (whence == SEEK_CUR)
 116         offset = wf->position + offset;
 117     else if (whence == SEEK_END)
 118         offset = wf->length;
 119
 120     wf->error = offset < 0 || offset >= wf->length ||
 121                 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
 122                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
 123     wf->position = offset;
 124     return offset;
 125 }
 126
 127 /**
 128  * read non-zero integers (le32) from input stream
 129  * @param pb
 130  * @param[out] data destination
 131  * @param     count maximum number of integers to read
 132  * @return    total number of integers read
 133  */
 134 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
 135 {
 136     int i, total = 0;
 137     for (i = 0; i < count; i++) {
 138         if ((data[total] = avio_rl32(pb)))
 139            total++;
 140     }
 141     return total;
 142 }
 143
 144 /**
 145  * Open file
 146  * @param first_sector  First sector
 147  * @param length        Length of file (bytes)
 148  * @param depth         File allocation table depth
 149  * @return NULL on error
 150  */
 151 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
 152 {
 153     AVIOContext *pb;
 154     WtvFile *wf;
 155     uint8_t *buffer;
 156
 157     if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
 158         return NULL;
 159
 160     wf = av_mallocz(sizeof(WtvFile));
 161     if (!wf)
 162         return NULL;
 163
 164     if (depth == 0) {
 165         wf->sectors = av_malloc(sizeof(uint32_t));
 166         if (!wf->sectors) {
 167             av_free(wf);
 168             return NULL;
 169         }
 170         wf->sectors[0]  = first_sector;
 171         wf->nb_sectors  = 1;
 172         wf->sector_bits = WTV_SECTOR_BITS;
 173     } else if (depth == 1) {
 174         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
 175         if (!wf->sectors) {
 176             av_free(wf);
 177             return NULL;
 178         }
 179         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
 180         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 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(nb_sectors1 << 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 (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
 194                 break;
 195             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
 196         }
 197         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 198     } else {
 199         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 200         av_free(wf);
 201         return NULL;
 202     }
 203
 204     if (!wf->nb_sectors) {
 205         av_free(wf->sectors);
 206         av_free(wf);
 207         return NULL;
 208     }
 209
 210     /* check length */
 211     length &= 0xFFFFFFFFFFFF;
 212     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
 213         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);
 214         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
 215     }
 216     wf->length = length;
 217
 218     /* seek to intial sector */
 219     wf->position = 0;
 220     if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
 221         av_free(wf->sectors);
 222         av_free(wf);
 223         return NULL;
 224     }
 225
 226     wf->pb_filesystem = s->pb;
 227     buffer = av_malloc(1 << wf->sector_bits);
 228     if (!buffer) {
 229         av_free(wf->sectors);
 230         av_free(wf);
 231         return NULL;
 232     }
 233
 234     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
 235                            wtvfile_read_packet, NULL, wtvfile_seek);
 236     if (!pb) {
 237         av_free(buffer);
 238         av_free(wf->sectors);
 239         av_free(wf);
 240     }
 241     return pb;
 242 }
 243
 244 static const ff_asf_guid dir_entry_guid =
 245     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
 246
 247 /**
 248  * Open file using filename
 249  * @param[in]  buf       directory buffer
 250  * @param      buf_size  directory buffer size
 251  * @param[in]  filename
 252  * @param      filename_size size of filename
 253  * @return NULL on error
 254  */
 255 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
 256 {
 257     const uint8_t *buf_end = buf + buf_size;
 258
 259     while(buf + 48 <= buf_end) {
 260         int dir_length, name_size, first_sector, depth;
 261         uint64_t file_length;
 262         const uint8_t *name;
 263         if (ff_guidcmp(buf, dir_entry_guid)) {
 264             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
 265                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
 266             break;
 267         }
 268         dir_length  = AV_RL16(buf + 16);
 269         file_length = AV_RL64(buf + 24);
 270         name_size   = 2 * AV_RL32(buf + 32);
 271         if (buf + 48 + name_size > buf_end) {
 272             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
 273             break;
 274         }
 275         first_sector = AV_RL32(buf + 40 + name_size);
 276         depth        = AV_RL32(buf + 44 + name_size);
 277
 278         /* compare file name; test optional null terminator */
 279         name = buf + 40;
 280         if (name_size >= filename_size &&
 281             !memcmp(name, filename, filename_size) &&
 282             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
 283             return wtvfile_open_sector(first_sector, file_length, depth, s);
 284
 285         buf += dir_length;
 286     }
 287     return 0;
 288 }
 289
 290 #define wtvfile_open(s, buf, buf_size, filename) \
 291     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
 292
 293 /**
 294  * Close file opened with wtvfile_open_sector(), or wtv_open()
 295  */
 296 static void wtvfile_close(AVIOContext *pb)
 297 {
 298     WtvFile *wf = pb->opaque;
 299     av_free(wf->sectors);
 300     av_free(pb);
 301 }
 302
 303 /*
 304  *
 305  * Main demuxer
 306  *
 307  */
 308
 309 typedef struct {
 310     int seen_data;
 311 } WtvStream;
 312
 313 typedef struct {
 314     AVIOContext *pb;       /** timeline file */
 315     int64_t epoch;
 316     int64_t pts;             /** pts for next data chunk */
 317     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
 318
 319     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
 320        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
 321     AVIndexEntry *index_entries;
 322     int nb_index_entries;
 323     unsigned int index_entries_allocated_size;
 324 } WtvContext;
 325
 326 /* WTV GUIDs */
 327 static const ff_asf_guid wtv_guid =
 328     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 329 static const ff_asf_guid metadata_guid =
 330     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
 331 static const ff_asf_guid timestamp_guid =
 332     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
 333 static const ff_asf_guid data_guid =
 334     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 335 static const ff_asf_guid stream_guid =
 336     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
 337 static const ff_asf_guid stream2_guid =
 338     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 339 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
 340     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
 341 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
 342     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
 343 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
 344     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
 345 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
 346     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
 347 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
 348     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
 349 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
 350     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
 351 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
 352     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
 353 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
 354     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
 355 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
 356     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
 357
 358 /* Windows media GUIDs */
 359
 360 /* Media types */
 361 static const ff_asf_guid mediatype_audio =
 362     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 363 static const ff_asf_guid mediatype_video =
 364     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 365 static const ff_asf_guid mediasubtype_mpeg1payload =
 366     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 367 static const ff_asf_guid mediatype_mpeg2_sections =
 368     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 369 static const ff_asf_guid mediatype_mpeg2_pes =
 370     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 371 static const ff_asf_guid mediatype_mstvcaption =
 372     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 373
 374 /* Media subtypes */
 375 static const ff_asf_guid mediasubtype_cpfilters_processed =
 376     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 377 static const ff_asf_guid mediasubtype_dvb_subtitle =
 378     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 379 static const ff_asf_guid mediasubtype_teletext =
 380     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 381 static const ff_asf_guid mediasubtype_dtvccdata =
 382     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 383 static const ff_asf_guid mediasubtype_mpeg2_sections =
 384     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 385
 386 /* Formats */
 387 static const ff_asf_guid format_cpfilters_processed =
 388     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 389 static const ff_asf_guid format_waveformatex =
 390     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 391 static const ff_asf_guid format_videoinfo2 =
 392     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 393 static const ff_asf_guid format_mpeg2_video =
 394     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 395 static const ff_asf_guid format_none =
 396     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 397
 398 static const AVCodecGuid video_guids[] = {
 399     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 400     {CODEC_ID_NONE}
 401 };
 402
 403 static int read_probe(AVProbeData *p)
 404 {
 405     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 406 }
 407
 408 /**
 409  * Convert win32 FILETIME to ISO-8601 string
 410  */
 411 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
 412 {
 413     time_t t = (value / 10000000LL) - 11644473600LL;
 414     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 415 }
 416
 417 /**
 418  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
 419  */
 420 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
 421 {
 422     time_t t = (value / 10000000LL) - 719162LL*86400LL;
 423     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 424 }
 425
 426 /**
 427  * Convert OLE DATE to ISO-8601 string
 428  */
 429 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
 430 {
 431     time_t t = 631112400LL + 86400*av_int2dbl(value);
 432     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 433 }
 434
 435 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
 436 {
 437     char mime[1024];
 438     char description[1024];
 439     unsigned int filesize;
 440     AVStream *st;
 441     int64_t pos = avio_tell(pb);
 442
 443     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
 444     if (strcmp(mime, "image/jpeg"))
 445         goto done;
 446
 447     avio_r8(pb);
 448     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
 449     filesize = avio_rl32(pb);
 450     if (!filesize)
 451         goto done;
 452
 453     st = av_new_stream(s, 0);
 454     if (!st)
 455         goto done;
 456     av_metadata_set2(&st->metadata, "title", description, 0);
 457     st->codec->codec_id   = CODEC_ID_MJPEG;
 458     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
 459     st->codec->extradata  = av_mallocz(filesize);
 460     if (!st->codec->extradata)
 461         goto done;
 462     st->codec->extradata_size = filesize;
 463     avio_read(pb, st->codec->extradata, filesize);
 464 done:
 465     avio_seek(pb, pos + length, SEEK_SET);
 466 }
 467
 468 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
 469 {
 470     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
 471     char *buf = av_malloc(buf_size);
 472     if (!buf)
 473         return;
 474
 475     if (type == 0 && length == 4) {
 476         snprintf(buf, buf_size, "%"PRIi32, 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             filetime_to_iso8601(buf, buf_size, num);
 490         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
 491                  !strcmp(key, "WM/WMRVEndTime"))
 492             crazytime_to_iso8601(buf, buf_size, num);
 493         else if (!strcmp(key, "WM/WMRVExpirationDate"))
 494             oledate_to_iso8601(buf, buf_size, num);
 495         else if (!strcmp(key, "WM/WMRVBitrate"))
 496             snprintf(buf, buf_size, "%f", av_int2dbl(num));
 497         else
 498             snprintf(buf, buf_size, "%"PRIi64, num);
 499     } else if (type == 5 && length == 2) {
 500         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
 501     } else if (type == 6 && length == 16) {
 502         ff_asf_guid guid;
 503         avio_read(pb, guid, 16);
 504         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
 505     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
 506         get_attachment(s, pb, length);
 507         av_freep(&buf);
 508         return;
 509     } else {
 510         av_freep(&buf);
 511         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
 512         avio_skip(pb, length);
 513         return;
 514     }
 515
 516     av_metadata_set2(&s->metadata, key, buf, 0);
 517     av_freep(&buf);
 518 }
 519
 520 /**
 521  * Parse metadata entries
 522  */
 523 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
 524 {
 525     ff_asf_guid guid;
 526     int length, type;
 527     while(!url_feof(pb)) {
 528         char key[1024];
 529         ff_get_guid(pb, &guid);
 530         type   = avio_rl32(pb);
 531         length = avio_rl32(pb);
 532         if (!length)
 533             break;
 534         if (ff_guidcmp(&guid, metadata_guid)) {
 535             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
 536                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
 537             break;
 538         }
 539         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
 540         get_tag(s, pb, key, type, length);
 541     }
 542
 543     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 544 }
 545
 546 /**
 547  * parse VIDEOINFOHEADER2 structure
 548  * @return bytes consumed
 549  */
 550 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 551 {
 552     WtvContext *wtv = s->priv_data;
 553     AVIOContext *pb = wtv->pb;
 554
 555     avio_skip(pb, 72);  // picture aspect ratio is unreliable
 556     ff_get_bmp_header(pb, st);
 557
 558     return 72 + 40;
 559 }
 560
 561 /**
 562  * Parse MPEG1WAVEFORMATEX extradata structure
 563  */
 564 static void parse_mpeg1waveformatex(AVStream *st)
 565 {
 566     /* fwHeadLayer */
 567     switch (AV_RL16(st->codec->extradata)) {
 568     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
 569     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
 570     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
 571     }
 572
 573     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
 574
 575     /* dwHeadMode */
 576     switch (AV_RL16(st->codec->extradata + 6)) {
 577     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
 578     case 8 :                   st->codec->channels = 1; break;
 579     }
 580 }
 581
 582 /**
 583  * Initialise stream
 584  * @param st Stream to initialise, or NULL to create and initialise new stream
 585  * @return NULL on error
 586  */
 587 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
 588 {
 589     if (st) {
 590         if (st->codec->extradata) {
 591             av_freep(&st->codec->extradata);
 592             st->codec->extradata_size = 0;
 593         }
 594     } else {
 595         WtvStream *wst = av_mallocz(sizeof(WtvStream));
 596         if (!wst)
 597             return NULL;
 598         st = av_new_stream(s, sid);
 599         if (!st)
 600             return NULL;
 601         st->priv_data = wst;
 602     }
 603     st->codec->codec_type = codec_type;
 604     st->need_parsing      = AVSTREAM_PARSE_FULL;
 605     av_set_pts_info(st, 64, 1, 10000000);
 606     return st;
 607 }
 608
 609 /**
 610  * parse Media Type structure and populate stream
 611  * @param st         Stream, or NULL to create new stream
 612  * @param mediatype  Mediatype GUID
 613  * @param subtype    Subtype GUID
 614  * @param formattype Format GUID
 615  * @param size       Size of format buffer
 616  * @return NULL on error
 617  */
 618 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
 619                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 620                                    ff_asf_guid formattype, int size)
 621 {
 622     WtvContext *wtv = s->priv_data;
 623     AVIOContext *pb = wtv->pb;
 624     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 625         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 626         ff_asf_guid actual_subtype;
 627         ff_asf_guid actual_formattype;
 628
 629         if (size < 32) {
 630             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 631             avio_skip(pb, size);
 632             return NULL;
 633         }
 634
 635         avio_skip(pb, size - 32);
 636         ff_get_guid(pb, &actual_subtype);
 637         ff_get_guid(pb, &actual_formattype);
 638         avio_seek(pb, -size, SEEK_CUR);
 639
 640         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 641         avio_skip(pb, 32);
 642         return st;
 643     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 644         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
 645         if (!st)
 646             return NULL;
 647         if (!ff_guidcmp(formattype, format_waveformatex)) {
 648             int ret = ff_get_wav_header(pb, st->codec, size);
 649             if (ret < 0)
 650                 return NULL;
 651         } else {
 652             if (ff_guidcmp(formattype, format_none))
 653                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 654             avio_skip(pb, size);
 655         }
 656
 657         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 658             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
 659         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 660             if (st->codec->extradata && st->codec->extradata_size >= 22)
 661                 parse_mpeg1waveformatex(st);
 662             else
 663                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 664         } else {
 665             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
 666             if (st->codec->codec_id == CODEC_ID_NONE)
 667                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 668         }
 669         return st;
 670     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 671         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
 672         if (!st)
 673             return NULL;
 674         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 675             int consumed = parse_videoinfoheader2(s, st);
 676             avio_skip(pb, FFMAX(size - consumed, 0));
 677         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 678             int consumed = parse_videoinfoheader2(s, st);
 679             avio_skip(pb, FFMAX(size - consumed, 0));
 680         } else {
 681             if (ff_guidcmp(formattype, format_none))
 682                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 683             avio_skip(pb, size);
 684         }
 685
 686         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 687             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 688         } else {
 689             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 690         }
 691         if (st->codec->codec_id == CODEC_ID_NONE)
 692             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 693         return st;
 694     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 695                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 696         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 697         if (!st)
 698             return NULL;
 699         if (ff_guidcmp(formattype, format_none))
 700             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 701         avio_skip(pb, size);
 702         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
 703         return st;
 704     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 705                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 706         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 707         if (!st)
 708             return NULL;
 709         if (ff_guidcmp(formattype, format_none))
 710             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 711         avio_skip(pb, size);
 712         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
 713         return st;
 714     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 715                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 716         if (ff_guidcmp(formattype, format_none))
 717             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 718         avio_skip(pb, size);
 719         return NULL;
 720     }
 721
 722     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
 723                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
 724                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
 725     avio_skip(pb, size);
 726     return NULL;
 727 }
 728
 729 enum {
 730     SEEK_TO_DATA = 0,
 731     SEEK_TO_PTS,
 732 };
 733
 734 /**
 735  * Parse WTV chunks
 736  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
 737  * @param seekts timestamp
 738  * @param[out] len Length of data chunk
 739  * @return stream index of data chunk, or <0 on error
 740  */
 741 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 742 {
 743     WtvContext *wtv = s->priv_data;
 744     AVIOContext *pb = wtv->pb;
 745     while (!url_feof(pb)) {
 746         ff_asf_guid g;
 747         int len, sid, consumed;
 748
 749         ff_get_guid(pb, &g);
 750         len = avio_rl32(pb);
 751         if (len < 32)
 752             break;
 753         sid = avio_rl32(pb) & 0x7FFF;
 754         avio_skip(pb, 8);
 755         consumed = 32;
 756
 757         if (!ff_guidcmp(g, stream_guid)) {
 758             if (ff_find_stream_index(s, sid) < 0) {
 759                 ff_asf_guid mediatype, subtype, formattype;
 760                 int size;
 761                 avio_skip(pb, 28);
 762                 ff_get_guid(pb, &mediatype);
 763                 ff_get_guid(pb, &subtype);
 764                 avio_skip(pb, 12);
 765                 ff_get_guid(pb, &formattype);
 766                 size = avio_rl32(pb);
 767                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
 768                 consumed += 92 + size;
 769             }
 770         } else if (!ff_guidcmp(g, stream2_guid)) {
 771             int stream_index = ff_find_stream_index(s, sid);
 772             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
 773                 ff_asf_guid mediatype, subtype, formattype;
 774                 int size;
 775                 avio_skip(pb, 12);
 776                 ff_get_guid(pb, &mediatype);
 777                 ff_get_guid(pb, &subtype);
 778                 avio_skip(pb, 12);
 779                 ff_get_guid(pb, &formattype);
 780                 size = avio_rl32(pb);
 781                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
 782                 consumed += 76 + size;
 783             }
 784         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 785                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 786                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 787                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 788                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 789                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 790             int stream_index = ff_find_stream_index(s, sid);
 791             if (stream_index >= 0) {
 792                 AVStream *st = s->streams[stream_index];
 793                 uint8_t buf[258];
 794                 const uint8_t *pbuf = buf;
 795                 int buf_size;
 796
 797                 avio_skip(pb, 8);
 798                 consumed += 8;
 799                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 800                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 801                     avio_skip(pb, 6);
 802                     consumed += 6;
 803                 }
 804
 805                 buf_size = FFMIN(len - consumed, sizeof(buf));
 806                 avio_read(pb, buf, buf_size);
 807                 consumed += buf_size;
 808                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
 809             }
 810         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
 811             int stream_index = ff_find_stream_index(s, sid);
 812             if (stream_index >= 0) {
 813                 AVStream *st = s->streams[stream_index];
 814                 int audio_type;
 815                 avio_skip(pb, 8);
 816                 audio_type = avio_r8(pb);
 817                 if (audio_type == 2)
 818                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
 819                 else if (audio_type == 3)
 820                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 821                 consumed += 9;
 822             }
 823         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 824             int stream_index = ff_find_stream_index(s, sid);
 825             if (stream_index >= 0) {
 826                 avio_skip(pb, 12);
 827                 if (avio_rl32(pb))
 828                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 829                 consumed += 16;
 830             }
 831         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 832             int stream_index = ff_find_stream_index(s, sid);
 833             if (stream_index >= 0) {
 834                 AVStream *st = s->streams[stream_index];
 835                 uint8_t language[4];
 836                 avio_skip(pb, 12);
 837                 avio_read(pb, language, 3);
 838                 if (language[0]) {
 839                     language[3] = 0;
 840                     av_metadata_set2(&st->metadata, "language", language, 0);
 841                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
 842                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 843                 }
 844                 consumed += 15;
 845             }
 846         } else if (!ff_guidcmp(g, timestamp_guid)) {
 847             int stream_index = ff_find_stream_index(s, sid);
 848             if (stream_index >= 0) {
 849                 avio_skip(pb, 8);
 850                 wtv->pts = avio_rl64(pb);
 851                 consumed += 16;
 852                 if (wtv->pts == -1)
 853                     wtv->pts = AV_NOPTS_VALUE;
 854                 else {
 855                     wtv->last_valid_pts = wtv->pts;
 856                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
 857                         wtv->epoch = wtv->pts;
 858                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 859 #define WTV_PAD8(x) (((x) + 7) & ~7)
 860                     avio_skip(pb, WTV_PAD8(len) - consumed);
 861                     return 0;
 862                 }
 863                 }
 864             }
 865         } else if (!ff_guidcmp(g, data_guid)) {
 866             int stream_index = ff_find_stream_index(s, sid);
 867             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
 868                 WtvStream *wst = s->streams[stream_index]->priv_data;
 869                 wst->seen_data = 1;
 870                 if (len_ptr) {
 871                     *len_ptr = len;
 872                 }
 873                 return stream_index;
 874             }
 875         } else if (
 876             !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}) ||
 877             !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}) ||
 878             !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ (const ff_asf_guid){0x12,0xF6,0x22,0xB6,0xAD,0x47,0x71,0x46,0xAD,0x6C,0x05,0xA9,0x8E,0x65,0xDE,0x3A}) ||
 879             !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}) ||
 880             !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}) ||
 881             !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}) ||
 882             !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}) ||
 883             !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}) ||
 884             !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}) ||
 885             !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}) ||
 886             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 887             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 888             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 889             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 890             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 891             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 892             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 893             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 894             //ignore known guids
 895         } else
 896             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
 897
 898         avio_skip(pb, WTV_PAD8(len) - consumed);
 899     }
 900     return AVERROR_EOF;
 901 }
 902
 903 /* declare utf16le strings */
 904 #define _ , 0,
 905 static const uint8_t timeline_le16[] =
 906     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
 907 static const uint8_t table_0_entries_legacy_attrib_le16[] =
 908     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
 909 static const uint8_t table_0_entries_time_le16[] =
 910     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
 911 static const uint8_t timeline_table_0_entries_Events_le16[] =
 912     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e'_'.'_'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'E'_'v'_'e'_'n'_'t'_'s', 0};
 913 #undef _
 914
 915 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
 916 {
 917     WtvContext *wtv = s->priv_data;
 918     int root_sector, root_size;
 919     uint8_t root[WTV_SECTOR_SIZE];
 920     AVIOContext *pb;
 921     int64_t timeline_pos;
 922     int ret;
 923
 924     wtv->epoch          =
 925     wtv->pts            =
 926     wtv->last_valid_pts = AV_NOPTS_VALUE;
 927
 928     /* read root directory sector */
 929     avio_skip(s->pb, 0x30);
 930     root_size = avio_rl32(s->pb);
 931     if (root_size > sizeof(root)) {
 932         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
 933         return AVERROR_INVALIDDATA;
 934     }
 935     avio_skip(s->pb, 4);
 936     root_sector = avio_rl32(s->pb);
 937
 938     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
 939     root_size = avio_read(s->pb, root, root_size);
 940     if (root_size < 0)
 941         return AVERROR_INVALIDDATA;
 942
 943     /* parse chunks up until first data chunk */
 944     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
 945     if (!wtv->pb) {
 946         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
 947         return AVERROR_INVALIDDATA;
 948     }
 949
 950     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 951     if (ret < 0)
 952         return ret;
 953     avio_seek(wtv->pb, -32, SEEK_CUR);
 954
 955     timeline_pos = avio_tell(s->pb); // save before opening another file
 956
 957     /* read metadata */
 958     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
 959     if (pb) {
 960         parse_legacy_attrib(s, pb);
 961         wtvfile_close(pb);
 962     }
 963
 964     /* read seek index */
 965     if (s->nb_streams) {
 966         AVStream *st = s->streams[0];
 967         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
 968         if (pb) {
 969             while(1) {
 970                 uint64_t timestamp = avio_rl64(pb);
 971                 uint64_t frame_nb  = avio_rl64(pb);
 972                 if (url_feof(pb))
 973                     break;
 974                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
 975                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
 976             }
 977             wtvfile_close(pb);
 978
 979             if (wtv->nb_index_entries) {
 980                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
 981                 if (pb) {
 982                     int i;
 983                     while (1) {
 984                         uint64_t frame_nb = avio_rl64(pb);
 985                         uint64_t position = avio_rl64(pb);
 986                         if (url_feof(pb))
 987                             break;
 988                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
 989                             AVIndexEntry *e = wtv->index_entries + i;
 990                             if (frame_nb > e->size)
 991                                 break;
 992                             if (position > e->pos)
 993                                 e->pos = position;
 994                         }
 995                     }
 996                     wtvfile_close(pb);
 997                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
 998                 }
 999             }
1000         }
1001     }
1002
1003     avio_seek(s->pb, timeline_pos, SEEK_SET);
1004     return 0;
1005 }
1006
1007 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1008 {
1009     WtvContext *wtv = s->priv_data;
1010     AVIOContext *pb = wtv->pb;
1011     int stream_index, len, ret;
1012
1013     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1014     if (stream_index < 0)
1015         return stream_index;
1016
1017     ret = av_get_packet(pb, pkt, len - 32);
1018     if (ret < 0)
1019         return ret;
1020     pkt->stream_index = stream_index;
1021     pkt->pts          = wtv->pts;
1022     avio_skip(pb, WTV_PAD8(len) - len);
1023     return 0;
1024 }
1025
1026 static int read_seek(AVFormatContext *s, int stream_index,
1027                      int64_t ts, int flags)
1028 {
1029     WtvContext *wtv = s->priv_data;
1030     AVIOContext *pb = wtv->pb;
1031     AVStream *st = s->streams[0];
1032     int64_t ts_relative;
1033     int i;
1034
1035     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1036         return AVERROR(ENOSYS);
1037
1038     /* timestamp adjustment is required because wtv->pts values are absolute,
1039      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1040     ts_relative = ts;
1041     if (wtv->epoch != AV_NOPTS_VALUE)
1042         ts_relative -= wtv->epoch;
1043
1044     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1045     if (i < 0) {
1046         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1047             avio_seek(pb, 0, SEEK_SET);
1048         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1049             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1050         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1051             return AVERROR(ERANGE);
1052         return 0;
1053     }
1054     wtv->pts = wtv->index_entries[i].timestamp;
1055     if (wtv->epoch != AV_NOPTS_VALUE)
1056         wtv->pts += wtv->epoch;
1057     wtv->last_valid_pts = wtv->pts;
1058     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1059     return 0;
1060 }
1061
1062 static int read_close(AVFormatContext *s)
1063 {
1064     WtvContext *wtv = s->priv_data;
1065     wtvfile_close(wtv->pb);
1066     return 0;
1067 }
1068
1069 AVInputFormat ff_wtv_demuxer = {
1070     .name           = "wtv",
1071     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1072     .priv_data_size = sizeof(WtvContext),
1073     .read_probe     = read_probe,
1074     .read_header    = read_header,
1075     .read_packet    = read_packet,
1076     .read_seek      = read_seek,
1077     .read_close     = read_close,
1078     .flags          = AVFMT_SHOW_IDS,
1079 };