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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 Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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/channel_layout.h"
  29 #include "libavutil/intreadwrite.h"
  30 #include "libavutil/intfloat.h"
  31 #include "libavutil/dict.h"
  32 #include "avformat.h"
  33 #include "internal.h"
  34 #include "riff.h"
  35 #include "asf.h"
  36 #include "mpegts.h"
  37
  38 /* Macros for formating GUIDs */
  39 #define PRI_PRETTY_GUID \
  40     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
  41 #define ARG_PRETTY_GUID(g) \
  42     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]
  43 #define LEN_PRETTY_GUID 34
  44
  45 /*
  46  *
  47  * File system routines
  48  *
  49  */
  50
  51 #define WTV_SECTOR_BITS    INT64_C(12)
  52 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
  53 #define WTV_BIGSECTOR_BITS 18
  54
  55 typedef struct {
  56     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
  57
  58     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
  59     uint32_t *sectors;   /** file allocation table */
  60     int nb_sectors;      /** number of sectors */
  61
  62     int error;
  63     int64_t position;
  64     int64_t length;
  65 } WtvFile;
  66
  67 /**
  68  * @return bytes read, 0 on end of file, or <0 on error
  69  */
  70 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
  71 {
  72     WtvFile *wf = opaque;
  73     AVIOContext *pb = wf->pb_filesystem;
  74     int nread = 0;
  75
  76     if (wf->error || pb->error)
  77         return -1;
  78     if (wf->position >= wf->length || pb->eof_reached)
  79         return 0;
  80
  81     buf_size = FFMIN(buf_size, wf->length - wf->position);
  82     while(nread < buf_size) {
  83         int n;
  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                 avio_seek(pb, wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
  98                 wf->error = 1;
  99                 break;
 100             }
 101         }
 102     }
 103     return nread;
 104 }
 105
 106 /**
 107  * @return position (or file length)
 108  */
 109 static 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                 avio_seek(pb, (wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
 123                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 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  */
 135 static 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  */
 152 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
 153 {
 154     AVIOContext *pb;
 155     WtvFile *wf;
 156     uint8_t *buffer;
 157
 158     if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
 159         return NULL;
 160
 161     wf = av_mallocz(sizeof(WtvFile));
 162     if (!wf)
 163         return NULL;
 164
 165     if (depth == 0) {
 166         wf->sectors = av_malloc(sizeof(uint32_t));
 167         if (!wf->sectors) {
 168             av_free(wf);
 169             return NULL;
 170         }
 171         wf->sectors[0]  = first_sector;
 172         wf->nb_sectors  = 1;
 173         wf->sector_bits = WTV_SECTOR_BITS;
 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         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 182     } else if (depth == 2) {
 183         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
 184         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
 185         int i;
 186
 187         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
 188         if (!wf->sectors) {
 189             av_free(wf);
 190             return NULL;
 191         }
 192         wf->nb_sectors = 0;
 193         for (i = 0; i < nb_sectors1; i++) {
 194             if (avio_seek(s->pb, sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
 195                 break;
 196             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
 197         }
 198         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 199     } else {
 200         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 201         av_free(wf);
 202         return NULL;
 203     }
 204
 205     if (!wf->nb_sectors) {
 206         av_free(wf->sectors);
 207         av_free(wf);
 208         return NULL;
 209     }
 210
 211     /* check length */
 212     length &= 0xFFFFFFFFFFFF;
 213     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
 214         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);
 215         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
 216     }
 217     wf->length = length;
 218
 219     /* seek to initial sector */
 220     wf->position = 0;
 221     if (avio_seek(s->pb, wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
 222         av_free(wf->sectors);
 223         av_free(wf);
 224         return NULL;
 225     }
 226
 227     wf->pb_filesystem = s->pb;
 228     buffer = av_malloc(1 << wf->sector_bits);
 229     if (!buffer) {
 230         av_free(wf->sectors);
 231         av_free(wf);
 232         return NULL;
 233     }
 234
 235     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
 236                            wtvfile_read_packet, NULL, wtvfile_seek);
 237     if (!pb) {
 238         av_free(buffer);
 239         av_free(wf->sectors);
 240         av_free(wf);
 241     }
 242     return pb;
 243 }
 244
 245 static const ff_asf_guid dir_entry_guid =
 246     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
 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  */
 256 static 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, 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 (48 + name_size > buf_end - buf) {
 278             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
 279             break;
 280         }
 281         first_sector = AV_RL32(buf + 40 + name_size);
 282         depth        = AV_RL32(buf + 44 + name_size);
 283
 284         /* compare file name; test optional null terminator */
 285         name = buf + 40;
 286         if (name_size >= filename_size &&
 287             !memcmp(name, filename, filename_size) &&
 288             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
 289             return wtvfile_open_sector(first_sector, file_length, depth, s);
 290
 291         buf += dir_length;
 292     }
 293     return 0;
 294 }
 295
 296 #define wtvfile_open(s, buf, buf_size, filename) \
 297     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
 298
 299 /**
 300  * Close file opened with wtvfile_open_sector(), or wtv_open()
 301  */
 302 static void wtvfile_close(AVIOContext *pb)
 303 {
 304     WtvFile *wf = pb->opaque;
 305     av_free(wf->sectors);
 306     av_free(wf);
 307     av_free(pb->buffer);
 308     av_free(pb);
 309 }
 310
 311 /*
 312  *
 313  * Main demuxer
 314  *
 315  */
 316
 317 typedef struct {
 318     int seen_data;
 319 } WtvStream;
 320
 321 typedef struct {
 322     AVIOContext *pb;       /** timeline file */
 323     int64_t epoch;
 324     int64_t pts;             /** pts for next data chunk */
 325     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
 326
 327     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
 328        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
 329     AVIndexEntry *index_entries;
 330     int nb_index_entries;
 331     unsigned int index_entries_allocated_size;
 332 } WtvContext;
 333
 334 /* WTV GUIDs */
 335 static const ff_asf_guid wtv_guid =
 336     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 337 static const ff_asf_guid metadata_guid =
 338     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
 339 static const ff_asf_guid timestamp_guid =
 340     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
 341 static const ff_asf_guid data_guid =
 342     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 343 static const ff_asf_guid stream_guid =
 344     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
 345 static const ff_asf_guid stream2_guid =
 346     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 347 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
 348     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
 349 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
 350     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
 351 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
 352     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
 353 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
 354     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
 355 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
 356     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
 357 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
 358     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
 359 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
 360     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
 361 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
 362     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
 363 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
 364     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
 365
 366 /* Windows media GUIDs */
 367
 368 /* Media types */
 369 static const ff_asf_guid mediatype_audio =
 370     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 371 static const ff_asf_guid mediatype_video =
 372     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 373 static const ff_asf_guid mediasubtype_mpeg1payload =
 374     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 375 static const ff_asf_guid mediatype_mpeg2_sections =
 376     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 377 static const ff_asf_guid mediatype_mpeg2_pes =
 378     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 379 static const ff_asf_guid mediatype_mstvcaption =
 380     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 381
 382 /* Media subtypes */
 383 static const ff_asf_guid mediasubtype_cpfilters_processed =
 384     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 385 static const ff_asf_guid mediasubtype_dvb_subtitle =
 386     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 387 static const ff_asf_guid mediasubtype_teletext =
 388     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 389 static const ff_asf_guid mediasubtype_dtvccdata =
 390     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 391 static const ff_asf_guid mediasubtype_mpeg2_sections =
 392     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 393
 394 /* Formats */
 395 static const ff_asf_guid format_cpfilters_processed =
 396     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 397 static const ff_asf_guid format_waveformatex =
 398     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 399 static const ff_asf_guid format_videoinfo2 =
 400     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 401 static const ff_asf_guid format_mpeg2_video =
 402     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 403 static const ff_asf_guid format_none =
 404     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 405
 406 static const AVCodecGuid video_guids[] = {
 407     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 408     {AV_CODEC_ID_NONE}
 409 };
 410
 411 static int read_probe(AVProbeData *p)
 412 {
 413     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 414 }
 415
 416 /**
 417  * Convert win32 FILETIME to ISO-8601 string
 418  */
 419 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
 420 {
 421     time_t t = (value / 10000000LL) - 11644473600LL;
 422     struct tm *tm = gmtime(&t);
 423     if (tm)
 424         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 425     else
 426         buf[0] = '\0';
 427 }
 428
 429 /**
 430  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
 431  */
 432 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
 433 {
 434     time_t t = (value / 10000000LL) - 719162LL*86400LL;
 435     struct tm *tm = gmtime(&t);
 436     if (tm)
 437         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 438     else
 439         buf[0] = '\0';
 440 }
 441
 442 /**
 443  * Convert OLE DATE to ISO-8601 string
 444  */
 445 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
 446 {
 447     time_t t = 631112400LL + 86400*av_int2double(value);
 448     struct tm *tm = gmtime(&t);
 449     if (tm)
 450         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 451     else
 452         buf[0] = '\0';
 453 }
 454
 455 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
 456 {
 457     char mime[1024];
 458     char description[1024];
 459     unsigned int filesize;
 460     AVStream *st;
 461     int64_t pos = avio_tell(pb);
 462
 463     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
 464     if (strcmp(mime, "image/jpeg"))
 465         goto done;
 466
 467     avio_r8(pb);
 468     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
 469     filesize = avio_rl32(pb);
 470     if (!filesize)
 471         goto done;
 472
 473     st = avformat_new_stream(s, NULL);
 474     if (!st)
 475         goto done;
 476     av_dict_set(&st->metadata, "title", description, 0);
 477     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
 478     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
 479     st->codec->extradata  = av_mallocz(filesize);
 480     st->id = -1;
 481     if (!st->codec->extradata)
 482         goto done;
 483     st->codec->extradata_size = filesize;
 484     avio_read(pb, st->codec->extradata, filesize);
 485 done:
 486     avio_seek(pb, pos + length, SEEK_SET);
 487 }
 488
 489 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
 490 {
 491     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
 492     char *buf = av_malloc(buf_size);
 493     if (!buf)
 494         return;
 495
 496     if (type == 0 && length == 4) {
 497         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
 498     } else if (type == 1) {
 499         avio_get_str16le(pb, length, buf, buf_size);
 500         if (!strlen(buf)) {
 501            av_free(buf);
 502            return;
 503         }
 504     } else if (type == 3 && length == 4) {
 505         strcpy(buf, avio_rl32(pb) ? "true" : "false");
 506     } else if (type == 4 && length == 8) {
 507         int64_t num = avio_rl64(pb);
 508         if (!strcmp(key, "WM/EncodingTime") ||
 509             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
 510             filetime_to_iso8601(buf, buf_size, num);
 511         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
 512                  !strcmp(key, "WM/WMRVEndTime"))
 513             crazytime_to_iso8601(buf, buf_size, num);
 514         else if (!strcmp(key, "WM/WMRVExpirationDate"))
 515             oledate_to_iso8601(buf, buf_size, num);
 516         else if (!strcmp(key, "WM/WMRVBitrate"))
 517             snprintf(buf, buf_size, "%f", av_int2double(num));
 518         else
 519             snprintf(buf, buf_size, "%"PRIi64, num);
 520     } else if (type == 5 && length == 2) {
 521         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
 522     } else if (type == 6 && length == 16) {
 523         ff_asf_guid guid;
 524         avio_read(pb, guid, 16);
 525         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
 526     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
 527         get_attachment(s, pb, length);
 528         av_freep(&buf);
 529         return;
 530     } else {
 531         av_freep(&buf);
 532         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
 533         avio_skip(pb, length);
 534         return;
 535     }
 536
 537     av_dict_set(&s->metadata, key, buf, 0);
 538     av_freep(&buf);
 539 }
 540
 541 /**
 542  * Parse metadata entries
 543  */
 544 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
 545 {
 546     ff_asf_guid guid;
 547     int length, type;
 548     while(!pb->eof_reached) {
 549         char key[1024];
 550         ff_get_guid(pb, &guid);
 551         type   = avio_rl32(pb);
 552         length = avio_rl32(pb);
 553         if (!length)
 554             break;
 555         if (ff_guidcmp(&guid, metadata_guid)) {
 556             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
 557                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
 558             break;
 559         }
 560         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
 561         get_tag(s, pb, key, type, length);
 562     }
 563
 564     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 565 }
 566
 567 /**
 568  * parse VIDEOINFOHEADER2 structure
 569  * @return bytes consumed
 570  */
 571 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 572 {
 573     WtvContext *wtv = s->priv_data;
 574     AVIOContext *pb = wtv->pb;
 575
 576     avio_skip(pb, 72);  // picture aspect ratio is unreliable
 577     ff_get_bmp_header(pb, st);
 578
 579     return 72 + 40;
 580 }
 581
 582 /**
 583  * Parse MPEG1WAVEFORMATEX extradata structure
 584  */
 585 static void parse_mpeg1waveformatex(AVStream *st)
 586 {
 587     /* fwHeadLayer */
 588     switch (AV_RL16(st->codec->extradata)) {
 589     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
 590     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
 591     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
 592     }
 593
 594     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
 595
 596     /* dwHeadMode */
 597     switch (AV_RL16(st->codec->extradata + 6)) {
 598     case 1 :
 599     case 2 :
 600     case 4 : st->codec->channels       = 2;
 601              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
 602              break;
 603     case 8 : st->codec->channels       = 1;
 604              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
 605              break;
 606     }
 607 }
 608
 609 /**
 610  * Initialise stream
 611  * @param st Stream to initialise, or NULL to create and initialise new stream
 612  * @return NULL on error
 613  */
 614 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
 615 {
 616     if (st) {
 617         if (st->codec->extradata) {
 618             av_freep(&st->codec->extradata);
 619             st->codec->extradata_size = 0;
 620         }
 621     } else {
 622         WtvStream *wst = av_mallocz(sizeof(WtvStream));
 623         if (!wst)
 624             return NULL;
 625         st = avformat_new_stream(s, NULL);
 626         if (!st)
 627             return NULL;
 628         st->id = sid;
 629         st->priv_data = wst;
 630     }
 631     st->codec->codec_type = codec_type;
 632     st->need_parsing      = AVSTREAM_PARSE_FULL;
 633     avpriv_set_pts_info(st, 64, 1, 10000000);
 634     return st;
 635 }
 636
 637 /**
 638  * parse Media Type structure and populate stream
 639  * @param st         Stream, or NULL to create new stream
 640  * @param mediatype  Mediatype GUID
 641  * @param subtype    Subtype GUID
 642  * @param formattype Format GUID
 643  * @param size       Size of format buffer
 644  * @return NULL on error
 645  */
 646 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
 647                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 648                                    ff_asf_guid formattype, int size)
 649 {
 650     WtvContext *wtv = s->priv_data;
 651     AVIOContext *pb = wtv->pb;
 652     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 653         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 654         ff_asf_guid actual_subtype;
 655         ff_asf_guid actual_formattype;
 656
 657         if (size < 32) {
 658             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 659             avio_skip(pb, size);
 660             return NULL;
 661         }
 662
 663         avio_skip(pb, size - 32);
 664         ff_get_guid(pb, &actual_subtype);
 665         ff_get_guid(pb, &actual_formattype);
 666         avio_seek(pb, -size, SEEK_CUR);
 667
 668         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 669         avio_skip(pb, 32);
 670         return st;
 671     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 672         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
 673         if (!st)
 674             return NULL;
 675         if (!ff_guidcmp(formattype, format_waveformatex)) {
 676             int ret = ff_get_wav_header(pb, st->codec, size);
 677             if (ret < 0)
 678                 return NULL;
 679         } else {
 680             if (ff_guidcmp(formattype, format_none))
 681                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 682             avio_skip(pb, size);
 683         }
 684
 685         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 686             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
 687         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 688             if (st->codec->extradata && st->codec->extradata_size >= 22)
 689                 parse_mpeg1waveformatex(st);
 690             else
 691                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 692         } else {
 693             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
 694             if (st->codec->codec_id == AV_CODEC_ID_NONE)
 695                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 696         }
 697         return st;
 698     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 699         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
 700         if (!st)
 701             return NULL;
 702         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 703             int consumed = parse_videoinfoheader2(s, st);
 704             avio_skip(pb, FFMAX(size - consumed, 0));
 705         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 706             int consumed = parse_videoinfoheader2(s, st);
 707             avio_skip(pb, FFMAX(size - consumed, 0));
 708         } else {
 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         }
 713
 714         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 715             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 716         } else {
 717             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 718         }
 719         if (st->codec->codec_id == AV_CODEC_ID_NONE)
 720             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 721         return st;
 722     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 723                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 724         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 725         if (!st)
 726             return NULL;
 727         if (ff_guidcmp(formattype, format_none))
 728             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 729         avio_skip(pb, size);
 730         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
 731         return st;
 732     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 733                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 734         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 735         if (!st)
 736             return NULL;
 737         if (ff_guidcmp(formattype, format_none))
 738             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 739         avio_skip(pb, size);
 740         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
 741         return st;
 742     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 743                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 744         if (ff_guidcmp(formattype, format_none))
 745             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 746         avio_skip(pb, size);
 747         return NULL;
 748     }
 749
 750     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
 751                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
 752                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
 753     avio_skip(pb, size);
 754     return NULL;
 755 }
 756
 757 enum {
 758     SEEK_TO_DATA = 0,
 759     SEEK_TO_PTS,
 760 };
 761
 762 /**
 763  * Parse WTV chunks
 764  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
 765  * @param seekts timestamp
 766  * @param[out] len_ptr Length of data chunk
 767  * @return stream index of data chunk, or <0 on error
 768  */
 769 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 770 {
 771     WtvContext *wtv = s->priv_data;
 772     AVIOContext *pb = wtv->pb;
 773     while (!pb->eof_reached) {
 774         ff_asf_guid g;
 775         int len, sid, consumed;
 776
 777         ff_get_guid(pb, &g);
 778         len = avio_rl32(pb);
 779         if (len < 32)
 780             break;
 781         sid = avio_rl32(pb) & 0x7FFF;
 782         avio_skip(pb, 8);
 783         consumed = 32;
 784
 785         if (!ff_guidcmp(g, stream_guid)) {
 786             if (ff_find_stream_index(s, sid) < 0) {
 787                 ff_asf_guid mediatype, subtype, formattype;
 788                 int size;
 789                 avio_skip(pb, 28);
 790                 ff_get_guid(pb, &mediatype);
 791                 ff_get_guid(pb, &subtype);
 792                 avio_skip(pb, 12);
 793                 ff_get_guid(pb, &formattype);
 794                 size = avio_rl32(pb);
 795                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
 796                 consumed += 92 + size;
 797             }
 798         } else if (!ff_guidcmp(g, stream2_guid)) {
 799             int stream_index = ff_find_stream_index(s, sid);
 800             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
 801                 ff_asf_guid mediatype, subtype, formattype;
 802                 int size;
 803                 avio_skip(pb, 12);
 804                 ff_get_guid(pb, &mediatype);
 805                 ff_get_guid(pb, &subtype);
 806                 avio_skip(pb, 12);
 807                 ff_get_guid(pb, &formattype);
 808                 size = avio_rl32(pb);
 809                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
 810                 consumed += 76 + size;
 811             }
 812         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 813                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 814                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 815                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 816                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 817                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 818             int stream_index = ff_find_stream_index(s, sid);
 819             if (stream_index >= 0) {
 820                 AVStream *st = s->streams[stream_index];
 821                 uint8_t buf[258];
 822                 const uint8_t *pbuf = buf;
 823                 int buf_size;
 824
 825                 avio_skip(pb, 8);
 826                 consumed += 8;
 827                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 828                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 829                     avio_skip(pb, 6);
 830                     consumed += 6;
 831                 }
 832
 833                 buf_size = FFMIN(len - consumed, sizeof(buf));
 834                 avio_read(pb, buf, buf_size);
 835                 consumed += buf_size;
 836                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
 837             }
 838         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
 839             int stream_index = ff_find_stream_index(s, sid);
 840             if (stream_index >= 0) {
 841                 AVStream *st = s->streams[stream_index];
 842                 int audio_type;
 843                 avio_skip(pb, 8);
 844                 audio_type = avio_r8(pb);
 845                 if (audio_type == 2)
 846                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
 847                 else if (audio_type == 3)
 848                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 849                 consumed += 9;
 850             }
 851         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 852             int stream_index = ff_find_stream_index(s, sid);
 853             if (stream_index >= 0) {
 854                 avio_skip(pb, 12);
 855                 if (avio_rl32(pb))
 856                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 857                 consumed += 16;
 858             }
 859         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 860             int stream_index = ff_find_stream_index(s, sid);
 861             if (stream_index >= 0) {
 862                 AVStream *st = s->streams[stream_index];
 863                 uint8_t language[4];
 864                 avio_skip(pb, 12);
 865                 avio_read(pb, language, 3);
 866                 if (language[0]) {
 867                     language[3] = 0;
 868                     av_dict_set(&st->metadata, "language", language, 0);
 869                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
 870                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 871                 }
 872                 consumed += 15;
 873             }
 874         } else if (!ff_guidcmp(g, timestamp_guid)) {
 875             int stream_index = ff_find_stream_index(s, sid);
 876             if (stream_index >= 0) {
 877                 avio_skip(pb, 8);
 878                 wtv->pts = avio_rl64(pb);
 879                 consumed += 16;
 880                 if (wtv->pts == -1)
 881                     wtv->pts = AV_NOPTS_VALUE;
 882                 else {
 883                     wtv->last_valid_pts = wtv->pts;
 884                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
 885                         wtv->epoch = wtv->pts;
 886                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 887 #define WTV_PAD8(x) (((x) + 7) & ~7)
 888                     avio_skip(pb, WTV_PAD8(len) - consumed);
 889                     return 0;
 890                 }
 891                 }
 892             }
 893         } else if (!ff_guidcmp(g, data_guid)) {
 894             int stream_index = ff_find_stream_index(s, sid);
 895             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
 896                 WtvStream *wst = s->streams[stream_index]->priv_data;
 897                 wst->seen_data = 1;
 898                 if (len_ptr) {
 899                     *len_ptr = len;
 900                 }
 901                 return stream_index;
 902             }
 903         } else if (
 904             !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}) ||
 905             !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}) ||
 906             !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}) ||
 907             !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}) ||
 908             !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}) ||
 909             !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}) ||
 910             !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}) ||
 911             !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}) ||
 912             !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}) ||
 913             !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}) ||
 914             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 915             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 916             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 917             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 918             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 919             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 920             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 921             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 922             //ignore known guids
 923         } else
 924             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
 925
 926         avio_skip(pb, WTV_PAD8(len) - consumed);
 927     }
 928     return AVERROR_EOF;
 929 }
 930
 931 /* declare utf16le strings */
 932 #define _ , 0,
 933 static const uint8_t timeline_le16[] =
 934     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
 935 static const uint8_t table_0_entries_legacy_attrib_le16[] =
 936     {'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};
 937 static const uint8_t table_0_entries_time_le16[] =
 938     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
 939 static const uint8_t timeline_table_0_entries_Events_le16[] =
 940     {'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};
 941 #undef _
 942
 943 static int read_header(AVFormatContext *s)
 944 {
 945     WtvContext *wtv = s->priv_data;
 946     int root_sector, root_size;
 947     uint8_t root[WTV_SECTOR_SIZE];
 948     AVIOContext *pb;
 949     int64_t timeline_pos;
 950     int ret;
 951
 952     wtv->epoch          =
 953     wtv->pts            =
 954     wtv->last_valid_pts = AV_NOPTS_VALUE;
 955
 956     /* read root directory sector */
 957     avio_skip(s->pb, 0x30);
 958     root_size = avio_rl32(s->pb);
 959     if (root_size > sizeof(root)) {
 960         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
 961         return AVERROR_INVALIDDATA;
 962     }
 963     avio_skip(s->pb, 4);
 964     root_sector = avio_rl32(s->pb);
 965
 966     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
 967     root_size = avio_read(s->pb, root, root_size);
 968     if (root_size < 0)
 969         return AVERROR_INVALIDDATA;
 970
 971     /* parse chunks up until first data chunk */
 972     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
 973     if (!wtv->pb) {
 974         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
 975         return AVERROR_INVALIDDATA;
 976     }
 977
 978     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 979     if (ret < 0)
 980         return ret;
 981     avio_seek(wtv->pb, -32, SEEK_CUR);
 982
 983     timeline_pos = avio_tell(s->pb); // save before opening another file
 984
 985     /* read metadata */
 986     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
 987     if (pb) {
 988         parse_legacy_attrib(s, pb);
 989         wtvfile_close(pb);
 990     }
 991
 992     /* read seek index */
 993     if (s->nb_streams) {
 994         AVStream *st = s->streams[0];
 995         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
 996         if (pb) {
 997             while(1) {
 998                 uint64_t timestamp = avio_rl64(pb);
 999                 uint64_t frame_nb  = avio_rl64(pb);
1000                 if (pb->eof_reached)
1001                     break;
1002                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1003                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1004             }
1005             wtvfile_close(pb);
1006
1007             if (wtv->nb_index_entries) {
1008                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1009                 if (pb) {
1010                     int i;
1011                     while (1) {
1012                         uint64_t frame_nb = avio_rl64(pb);
1013                         uint64_t position = avio_rl64(pb);
1014                         if (pb->eof_reached)
1015                             break;
1016                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1017                             AVIndexEntry *e = wtv->index_entries + i;
1018                             if (frame_nb > e->size)
1019                                 break;
1020                             if (position > e->pos)
1021                                 e->pos = position;
1022                         }
1023                     }
1024                     wtvfile_close(pb);
1025                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1026                 }
1027             }
1028         }
1029     }
1030
1031     avio_seek(s->pb, timeline_pos, SEEK_SET);
1032     return 0;
1033 }
1034
1035 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1036 {
1037     WtvContext *wtv = s->priv_data;
1038     AVIOContext *pb = wtv->pb;
1039     int stream_index, len, ret;
1040
1041     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1042     if (stream_index < 0)
1043         return stream_index;
1044
1045     ret = av_get_packet(pb, pkt, len - 32);
1046     if (ret < 0)
1047         return ret;
1048     pkt->stream_index = stream_index;
1049     pkt->pts          = wtv->pts;
1050     avio_skip(pb, WTV_PAD8(len) - len);
1051     return 0;
1052 }
1053
1054 static int read_seek(AVFormatContext *s, int stream_index,
1055                      int64_t ts, int flags)
1056 {
1057     WtvContext *wtv = s->priv_data;
1058     AVIOContext *pb = wtv->pb;
1059     AVStream *st = s->streams[0];
1060     int64_t ts_relative;
1061     int i;
1062
1063     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1064         return AVERROR(ENOSYS);
1065
1066     /* timestamp adjustment is required because wtv->pts values are absolute,
1067      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1068     ts_relative = ts;
1069     if (wtv->epoch != AV_NOPTS_VALUE)
1070         ts_relative -= wtv->epoch;
1071
1072     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1073     if (i < 0) {
1074         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1075             avio_seek(pb, 0, SEEK_SET);
1076         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1077             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1078         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1079             return AVERROR(ERANGE);
1080         return 0;
1081     }
1082     wtv->pts = wtv->index_entries[i].timestamp;
1083     if (wtv->epoch != AV_NOPTS_VALUE)
1084         wtv->pts += wtv->epoch;
1085     wtv->last_valid_pts = wtv->pts;
1086     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1087     return 0;
1088 }
1089
1090 static int read_close(AVFormatContext *s)
1091 {
1092     WtvContext *wtv = s->priv_data;
1093     av_free(wtv->index_entries);
1094     wtvfile_close(wtv->pb);
1095     return 0;
1096 }
1097
1098 AVInputFormat ff_wtv_demuxer = {
1099     .name           = "wtv",
1100     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1101     .priv_data_size = sizeof(WtvContext),
1102     .read_probe     = read_probe,
1103     .read_header    = read_header,
1104     .read_packet    = read_packet,
1105     .read_seek      = read_seek,
1106     .read_close     = read_close,
1107     .flags          = AVFMT_SHOW_IDS,
1108 };