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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 <inttypes.h>
  29
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/intreadwrite.h"
  32 #include "libavutil/intfloat.h"
  33 #include "libavutil/dict.h"
  34 #include "avformat.h"
  35 #include "internal.h"
  36 #include "riff.h"
  37 #include "asf.h"
  38 #include "mpegts.h"
  39
  40 /* Macros for formating GUIDs */
  41 #define PRI_PRETTY_GUID \
  42     "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
  43 #define ARG_PRETTY_GUID(g) \
  44     AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
  45 #define LEN_PRETTY_GUID 34
  46
  47 /*
  48  *
  49  * File system routines
  50  *
  51  */
  52
  53 #define WTV_SECTOR_BITS    12
  54 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
  55 #define WTV_BIGSECTOR_BITS 18
  56
  57 #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)
  58
  59 typedef struct {
  60     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
  61
  62     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
  63     uint32_t *sectors;   /** file allocation table */
  64     int nb_sectors;      /** number of sectors */
  65
  66     int error;
  67     int64_t position;
  68     int64_t length;
  69 } WtvFile;
  70
  71 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
  72 {
  73     return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);
  74 }
  75
  76 /**
  77  * @return bytes read, 0 on end of file, or <0 on error
  78  */
  79 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
  80 {
  81     WtvFile *wf = opaque;
  82     AVIOContext *pb = wf->pb_filesystem;
  83     int nread = 0;
  84
  85     if (wf->error || pb->error)
  86         return -1;
  87     if (wf->position >= wf->length || pb->eof_reached)
  88         return 0;
  89
  90     buf_size = FFMIN(buf_size, wf->length - wf->position);
  91     while(nread < buf_size) {
  92         int n;
  93         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
  94         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
  95
  96         n = avio_read(pb, buf, read_request);
  97         if (n <= 0)
  98             break;
  99         nread += n;
 100         buf += n;
 101         wf->position += n;
 102         if (n == remaining_in_sector) {
 103             int i = wf->position >> wf->sector_bits;
 104             if (i >= wf->nb_sectors ||
 105                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
 106                 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
 107                 wf->error = 1;
 108                 break;
 109             }
 110         }
 111     }
 112     return nread;
 113 }
 114
 115 /**
 116  * @return position (or file length)
 117  */
 118 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
 119 {
 120     WtvFile *wf = opaque;
 121     AVIOContext *pb = wf->pb_filesystem;
 122
 123     if (whence == AVSEEK_SIZE)
 124         return wf->length;
 125     else if (whence == SEEK_CUR)
 126         offset = wf->position + offset;
 127     else if (whence == SEEK_END)
 128         offset = wf->length;
 129
 130     wf->error = offset < 0 || offset >= wf->length ||
 131                 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
 132                                offset & ((1 << wf->sector_bits) - 1)) < 0;
 133     wf->position = offset;
 134     return offset;
 135 }
 136
 137 /**
 138  * read non-zero integers (le32) from input stream
 139  * @param pb
 140  * @param[out] data destination
 141  * @param     count maximum number of integers to read
 142  * @return    total number of integers read
 143  */
 144 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
 145 {
 146     int i, total = 0;
 147     for (i = 0; i < count; i++) {
 148         if ((data[total] = avio_rl32(pb)))
 149            total++;
 150     }
 151     return total;
 152 }
 153
 154 /**
 155  * Open file
 156  * @param first_sector  First sector
 157  * @param length        Length of file (bytes)
 158  * @param depth         File allocation table depth
 159  * @return NULL on error
 160  */
 161 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
 162 {
 163     AVIOContext *pb;
 164     WtvFile *wf;
 165     uint8_t *buffer;
 166
 167     if (seek_by_sector(s->pb, first_sector, 0) < 0)
 168         return NULL;
 169
 170     wf = av_mallocz(sizeof(WtvFile));
 171     if (!wf)
 172         return NULL;
 173
 174     if (depth == 0) {
 175         wf->sectors = av_malloc(sizeof(uint32_t));
 176         if (!wf->sectors) {
 177             av_free(wf);
 178             return NULL;
 179         }
 180         wf->sectors[0]  = first_sector;
 181         wf->nb_sectors  = 1;
 182         wf->sector_bits = WTV_SECTOR_BITS;
 183     } else if (depth == 1) {
 184         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
 185         if (!wf->sectors) {
 186             av_free(wf);
 187             return NULL;
 188         }
 189         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
 190         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 191     } else if (depth == 2) {
 192         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
 193         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
 194         int i;
 195
 196         wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));
 197         if (!wf->sectors) {
 198             av_free(wf);
 199             return NULL;
 200         }
 201         wf->nb_sectors = 0;
 202         for (i = 0; i < nb_sectors1; i++) {
 203             if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
 204                 break;
 205             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
 206         }
 207         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 208     } else {
 209         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 210         av_free(wf);
 211         return NULL;
 212     }
 213
 214     if (!wf->nb_sectors) {
 215         av_free(wf->sectors);
 216         av_free(wf);
 217         return NULL;
 218     }
 219
 220     /* check length */
 221     length &= 0xFFFFFFFFFFFF;
 222     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
 223         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);
 224         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
 225     }
 226     wf->length = length;
 227
 228     /* seek to initial sector */
 229     wf->position = 0;
 230     if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
 231         av_free(wf->sectors);
 232         av_free(wf);
 233         return NULL;
 234     }
 235
 236     wf->pb_filesystem = s->pb;
 237     buffer = av_malloc(1 << wf->sector_bits);
 238     if (!buffer) {
 239         av_free(wf->sectors);
 240         av_free(wf);
 241         return NULL;
 242     }
 243
 244     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
 245                            wtvfile_read_packet, NULL, wtvfile_seek);
 246     if (!pb) {
 247         av_free(buffer);
 248         av_free(wf->sectors);
 249         av_free(wf);
 250     }
 251     return pb;
 252 }
 253
 254 static const ff_asf_guid dir_entry_guid =
 255     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
 256
 257 /**
 258  * Open file using filename
 259  * @param[in]  buf       directory buffer
 260  * @param      buf_size  directory buffer size
 261  * @param[in]  filename
 262  * @param      filename_size size of filename
 263  * @return NULL on error
 264  */
 265 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
 266 {
 267     const uint8_t *buf_end = buf + buf_size;
 268
 269     while(buf + 48 <= buf_end) {
 270         int dir_length, name_size, first_sector, depth;
 271         uint64_t file_length;
 272         const uint8_t *name;
 273         if (ff_guidcmp(buf, dir_entry_guid)) {
 274             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
 275                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
 276             break;
 277         }
 278         dir_length  = AV_RL16(buf + 16);
 279         file_length = AV_RL64(buf + 24);
 280         name_size   = 2 * AV_RL32(buf + 32);
 281         if (name_size < 0) {
 282             av_log(s, AV_LOG_ERROR,
 283                    "bad filename length, remaining directory entries ignored\n");
 284             break;
 285         }
 286         if (48 + name_size > buf_end - buf) {
 287             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
 288             break;
 289         }
 290         first_sector = AV_RL32(buf + 40 + name_size);
 291         depth        = AV_RL32(buf + 44 + name_size);
 292
 293         /* compare file name; test optional null terminator */
 294         name = buf + 40;
 295         if (name_size >= filename_size &&
 296             !memcmp(name, filename, filename_size) &&
 297             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
 298             return wtvfile_open_sector(first_sector, file_length, depth, s);
 299
 300         buf += dir_length;
 301     }
 302     return 0;
 303 }
 304
 305 #define wtvfile_open(s, buf, buf_size, filename) \
 306     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
 307
 308 /**
 309  * Close file opened with wtvfile_open_sector(), or wtv_open()
 310  */
 311 static void wtvfile_close(AVIOContext *pb)
 312 {
 313     WtvFile *wf = pb->opaque;
 314     av_free(wf->sectors);
 315     av_free(wf);
 316     av_free(pb->buffer);
 317     av_free(pb);
 318 }
 319
 320 /*
 321  *
 322  * Main demuxer
 323  *
 324  */
 325
 326 typedef struct {
 327     int seen_data;
 328 } WtvStream;
 329
 330 typedef struct {
 331     AVIOContext *pb;       /** timeline file */
 332     int64_t epoch;
 333     int64_t pts;             /** pts for next data chunk */
 334     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
 335
 336     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
 337        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
 338     AVIndexEntry *index_entries;
 339     int nb_index_entries;
 340     unsigned int index_entries_allocated_size;
 341 } WtvContext;
 342
 343 /* WTV GUIDs */
 344 static const ff_asf_guid wtv_guid =
 345     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 346 static const ff_asf_guid metadata_guid =
 347     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
 348 static const ff_asf_guid timestamp_guid =
 349     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
 350 static const ff_asf_guid data_guid =
 351     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 352 static const ff_asf_guid stream_guid =
 353     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
 354 static const ff_asf_guid stream2_guid =
 355     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 356 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
 357     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
 358 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
 359     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
 360 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
 361     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
 362 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
 363     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
 364 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
 365     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
 366 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
 367     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
 368 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
 369     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
 370 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
 371     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
 372 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
 373     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
 374
 375 /* Windows media GUIDs */
 376
 377 /* Media types */
 378 static const ff_asf_guid mediatype_audio =
 379     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 380 static const ff_asf_guid mediatype_video =
 381     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 382 static const ff_asf_guid mediasubtype_mpeg1payload =
 383     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 384 static const ff_asf_guid mediatype_mpeg2_sections =
 385     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 386 static const ff_asf_guid mediatype_mpeg2_pes =
 387     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 388 static const ff_asf_guid mediatype_mstvcaption =
 389     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 390
 391 /* Media subtypes */
 392 static const ff_asf_guid mediasubtype_cpfilters_processed =
 393     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 394 static const ff_asf_guid mediasubtype_dvb_subtitle =
 395     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 396 static const ff_asf_guid mediasubtype_teletext =
 397     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 398 static const ff_asf_guid mediasubtype_dtvccdata =
 399     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 400 static const ff_asf_guid mediasubtype_mpeg2_sections =
 401     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 402
 403 /* Formats */
 404 static const ff_asf_guid format_cpfilters_processed =
 405     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 406 static const ff_asf_guid format_waveformatex =
 407     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 408 static const ff_asf_guid format_videoinfo2 =
 409     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 410 static const ff_asf_guid format_mpeg2_video =
 411     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 412 static const ff_asf_guid format_none =
 413     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 414
 415 static const AVCodecGuid video_guids[] = {
 416     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 417     {AV_CODEC_ID_NONE}
 418 };
 419
 420 static int read_probe(AVProbeData *p)
 421 {
 422     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 423 }
 424
 425 /**
 426  * Convert win32 FILETIME to ISO-8601 string
 427  */
 428 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
 429 {
 430     time_t t = (value / 10000000LL) - 11644473600LL;
 431     struct tm *tm = gmtime(&t);
 432     if (tm)
 433         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 434     else
 435         buf[0] = '\0';
 436 }
 437
 438 /**
 439  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
 440  */
 441 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
 442 {
 443     time_t t = (value / 10000000LL) - 719162LL*86400LL;
 444     struct tm *tm = gmtime(&t);
 445     if (tm)
 446         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 447     else
 448         buf[0] = '\0';
 449 }
 450
 451 /**
 452  * Convert OLE DATE to ISO-8601 string
 453  */
 454 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
 455 {
 456     time_t t = 631112400LL + 86400*av_int2double(value);
 457     struct tm *tm = gmtime(&t);
 458     if (tm)
 459         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 460     else
 461         buf[0] = '\0';
 462 }
 463
 464 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
 465 {
 466     char mime[1024];
 467     char description[1024];
 468     unsigned int filesize;
 469     AVStream *st;
 470     int64_t pos = avio_tell(pb);
 471
 472     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
 473     if (strcmp(mime, "image/jpeg"))
 474         goto done;
 475
 476     avio_r8(pb);
 477     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
 478     filesize = avio_rl32(pb);
 479     if (!filesize)
 480         goto done;
 481
 482     st = avformat_new_stream(s, NULL);
 483     if (!st)
 484         goto done;
 485     av_dict_set(&st->metadata, "title", description, 0);
 486     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
 487     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
 488     st->codec->extradata  = av_mallocz(filesize);
 489     st->id = -1;
 490     if (!st->codec->extradata)
 491         goto done;
 492     st->codec->extradata_size = filesize;
 493     avio_read(pb, st->codec->extradata, filesize);
 494 done:
 495     avio_seek(pb, pos + length, SEEK_SET);
 496 }
 497
 498 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
 499 {
 500     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
 501     char *buf = av_malloc(buf_size);
 502     if (!buf)
 503         return;
 504
 505     if (type == 0 && length == 4) {
 506         snprintf(buf, buf_size, "%u", avio_rl32(pb));
 507     } else if (type == 1) {
 508         avio_get_str16le(pb, length, buf, buf_size);
 509         if (!strlen(buf)) {
 510            av_free(buf);
 511            return;
 512         }
 513     } else if (type == 3 && length == 4) {
 514         strcpy(buf, avio_rl32(pb) ? "true" : "false");
 515     } else if (type == 4 && length == 8) {
 516         int64_t num = avio_rl64(pb);
 517         if (!strcmp(key, "WM/EncodingTime") ||
 518             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
 519             filetime_to_iso8601(buf, buf_size, num);
 520         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
 521                  !strcmp(key, "WM/WMRVEndTime"))
 522             crazytime_to_iso8601(buf, buf_size, num);
 523         else if (!strcmp(key, "WM/WMRVExpirationDate"))
 524             oledate_to_iso8601(buf, buf_size, num);
 525         else if (!strcmp(key, "WM/WMRVBitrate"))
 526             snprintf(buf, buf_size, "%f", av_int2double(num));
 527         else
 528             snprintf(buf, buf_size, "%"PRIi64, num);
 529     } else if (type == 5 && length == 2) {
 530         snprintf(buf, buf_size, "%u", avio_rl16(pb));
 531     } else if (type == 6 && length == 16) {
 532         ff_asf_guid guid;
 533         avio_read(pb, guid, 16);
 534         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
 535     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
 536         get_attachment(s, pb, length);
 537         av_freep(&buf);
 538         return;
 539     } else {
 540         av_freep(&buf);
 541         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
 542         avio_skip(pb, length);
 543         return;
 544     }
 545
 546     av_dict_set(&s->metadata, key, buf, 0);
 547     av_freep(&buf);
 548 }
 549
 550 /**
 551  * Parse metadata entries
 552  */
 553 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
 554 {
 555     ff_asf_guid guid;
 556     int length, type;
 557     while(!pb->eof_reached) {
 558         char key[1024];
 559         ff_get_guid(pb, &guid);
 560         type   = avio_rl32(pb);
 561         length = avio_rl32(pb);
 562         if (!length)
 563             break;
 564         if (ff_guidcmp(&guid, metadata_guid)) {
 565             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
 566                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
 567             break;
 568         }
 569         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
 570         get_tag(s, pb, key, type, length);
 571     }
 572
 573     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 574 }
 575
 576 /**
 577  * parse VIDEOINFOHEADER2 structure
 578  * @return bytes consumed
 579  */
 580 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 581 {
 582     WtvContext *wtv = s->priv_data;
 583     AVIOContext *pb = wtv->pb;
 584
 585     avio_skip(pb, 72);  // picture aspect ratio is unreliable
 586     ff_get_bmp_header(pb, st);
 587
 588     return 72 + 40;
 589 }
 590
 591 /**
 592  * Parse MPEG1WAVEFORMATEX extradata structure
 593  */
 594 static void parse_mpeg1waveformatex(AVStream *st)
 595 {
 596     /* fwHeadLayer */
 597     switch (AV_RL16(st->codec->extradata)) {
 598     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
 599     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
 600     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
 601     }
 602
 603     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
 604
 605     /* dwHeadMode */
 606     switch (AV_RL16(st->codec->extradata + 6)) {
 607     case 1 :
 608     case 2 :
 609     case 4 : st->codec->channels       = 2;
 610              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
 611              break;
 612     case 8 : st->codec->channels       = 1;
 613              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
 614              break;
 615     }
 616 }
 617
 618 /**
 619  * Initialise stream
 620  * @param st Stream to initialise, or NULL to create and initialise new stream
 621  * @return NULL on error
 622  */
 623 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
 624 {
 625     if (st) {
 626         if (st->codec->extradata) {
 627             av_freep(&st->codec->extradata);
 628             st->codec->extradata_size = 0;
 629         }
 630     } else {
 631         WtvStream *wst = av_mallocz(sizeof(WtvStream));
 632         if (!wst)
 633             return NULL;
 634         st = avformat_new_stream(s, NULL);
 635         if (!st)
 636             return NULL;
 637         st->id = sid;
 638         st->priv_data = wst;
 639     }
 640     st->codec->codec_type = codec_type;
 641     st->need_parsing      = AVSTREAM_PARSE_FULL;
 642     avpriv_set_pts_info(st, 64, 1, 10000000);
 643     return st;
 644 }
 645
 646 /**
 647  * parse Media Type structure and populate stream
 648  * @param st         Stream, or NULL to create new stream
 649  * @param mediatype  Mediatype GUID
 650  * @param subtype    Subtype GUID
 651  * @param formattype Format GUID
 652  * @param size       Size of format buffer
 653  * @return NULL on error
 654  */
 655 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
 656                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 657                                    ff_asf_guid formattype, int size)
 658 {
 659     WtvContext *wtv = s->priv_data;
 660     AVIOContext *pb = wtv->pb;
 661     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 662         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 663         ff_asf_guid actual_subtype;
 664         ff_asf_guid actual_formattype;
 665
 666         if (size < 32) {
 667             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 668             avio_skip(pb, size);
 669             return NULL;
 670         }
 671
 672         avio_skip(pb, size - 32);
 673         ff_get_guid(pb, &actual_subtype);
 674         ff_get_guid(pb, &actual_formattype);
 675         avio_seek(pb, -size, SEEK_CUR);
 676
 677         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 678         avio_skip(pb, 32);
 679         return st;
 680     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 681         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
 682         if (!st)
 683             return NULL;
 684         if (!ff_guidcmp(formattype, format_waveformatex)) {
 685             int ret = ff_get_wav_header(pb, st->codec, size);
 686             if (ret < 0)
 687                 return NULL;
 688         } else {
 689             if (ff_guidcmp(formattype, format_none))
 690                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 691             avio_skip(pb, size);
 692         }
 693
 694         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 695             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
 696         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 697             if (st->codec->extradata && st->codec->extradata_size >= 22)
 698                 parse_mpeg1waveformatex(st);
 699             else
 700                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 701         } else {
 702             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
 703             if (st->codec->codec_id == AV_CODEC_ID_NONE)
 704                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 705         }
 706         return st;
 707     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 708         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
 709         if (!st)
 710             return NULL;
 711         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 712             int consumed = parse_videoinfoheader2(s, st);
 713             avio_skip(pb, FFMAX(size - consumed, 0));
 714         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 715             int consumed = parse_videoinfoheader2(s, st);
 716             avio_skip(pb, FFMAX(size - consumed, 0));
 717         } else {
 718             if (ff_guidcmp(formattype, format_none))
 719                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 720             avio_skip(pb, size);
 721         }
 722
 723         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 724             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 725         } else {
 726             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 727         }
 728         if (st->codec->codec_id == AV_CODEC_ID_NONE)
 729             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 730         return st;
 731     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 732                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 733         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 734         if (!st)
 735             return NULL;
 736         if (ff_guidcmp(formattype, format_none))
 737             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 738         avio_skip(pb, size);
 739         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
 740         return st;
 741     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 742                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 743         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 744         if (!st)
 745             return NULL;
 746         if (ff_guidcmp(formattype, format_none))
 747             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 748         avio_skip(pb, size);
 749         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
 750         return st;
 751     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 752                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 753         if (ff_guidcmp(formattype, format_none))
 754             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 755         avio_skip(pb, size);
 756         return NULL;
 757     }
 758
 759     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
 760                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
 761                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
 762     avio_skip(pb, size);
 763     return NULL;
 764 }
 765
 766 enum {
 767     SEEK_TO_DATA = 0,
 768     SEEK_TO_PTS,
 769 };
 770
 771 /**
 772  * Parse WTV chunks
 773  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
 774  * @param seekts timestamp
 775  * @param[out] len_ptr Length of data chunk
 776  * @return stream index of data chunk, or <0 on error
 777  */
 778 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 779 {
 780     WtvContext *wtv = s->priv_data;
 781     AVIOContext *pb = wtv->pb;
 782     while (!pb->eof_reached) {
 783         ff_asf_guid g;
 784         int len, sid, consumed;
 785
 786         ff_get_guid(pb, &g);
 787         len = avio_rl32(pb);
 788         if (len < 32)
 789             break;
 790         sid = avio_rl32(pb) & 0x7FFF;
 791         avio_skip(pb, 8);
 792         consumed = 32;
 793
 794         if (!ff_guidcmp(g, stream_guid)) {
 795             if (ff_find_stream_index(s, sid) < 0) {
 796                 ff_asf_guid mediatype, subtype, formattype;
 797                 int size;
 798                 avio_skip(pb, 28);
 799                 ff_get_guid(pb, &mediatype);
 800                 ff_get_guid(pb, &subtype);
 801                 avio_skip(pb, 12);
 802                 ff_get_guid(pb, &formattype);
 803                 size = avio_rl32(pb);
 804                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
 805                 consumed += 92 + size;
 806             }
 807         } else if (!ff_guidcmp(g, stream2_guid)) {
 808             int stream_index = ff_find_stream_index(s, sid);
 809             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
 810                 ff_asf_guid mediatype, subtype, formattype;
 811                 int size;
 812                 avio_skip(pb, 12);
 813                 ff_get_guid(pb, &mediatype);
 814                 ff_get_guid(pb, &subtype);
 815                 avio_skip(pb, 12);
 816                 ff_get_guid(pb, &formattype);
 817                 size = avio_rl32(pb);
 818                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
 819                 consumed += 76 + size;
 820             }
 821         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 822                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 823                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 824                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 825                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 826                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 827             int stream_index = ff_find_stream_index(s, sid);
 828             if (stream_index >= 0) {
 829                 AVStream *st = s->streams[stream_index];
 830                 uint8_t buf[258];
 831                 const uint8_t *pbuf = buf;
 832                 int buf_size;
 833
 834                 avio_skip(pb, 8);
 835                 consumed += 8;
 836                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 837                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 838                     avio_skip(pb, 6);
 839                     consumed += 6;
 840                 }
 841
 842                 buf_size = FFMIN(len - consumed, sizeof(buf));
 843                 avio_read(pb, buf, buf_size);
 844                 consumed += buf_size;
 845                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
 846             }
 847         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
 848             int stream_index = ff_find_stream_index(s, sid);
 849             if (stream_index >= 0) {
 850                 AVStream *st = s->streams[stream_index];
 851                 int audio_type;
 852                 avio_skip(pb, 8);
 853                 audio_type = avio_r8(pb);
 854                 if (audio_type == 2)
 855                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
 856                 else if (audio_type == 3)
 857                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 858                 consumed += 9;
 859             }
 860         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 861             int stream_index = ff_find_stream_index(s, sid);
 862             if (stream_index >= 0) {
 863                 avio_skip(pb, 12);
 864                 if (avio_rl32(pb))
 865                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 866                 consumed += 16;
 867             }
 868         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 869             int stream_index = ff_find_stream_index(s, sid);
 870             if (stream_index >= 0) {
 871                 AVStream *st = s->streams[stream_index];
 872                 uint8_t language[4];
 873                 avio_skip(pb, 12);
 874                 avio_read(pb, language, 3);
 875                 if (language[0]) {
 876                     language[3] = 0;
 877                     av_dict_set(&st->metadata, "language", language, 0);
 878                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
 879                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 880                 }
 881                 consumed += 15;
 882             }
 883         } else if (!ff_guidcmp(g, timestamp_guid)) {
 884             int stream_index = ff_find_stream_index(s, sid);
 885             if (stream_index >= 0) {
 886                 avio_skip(pb, 8);
 887                 wtv->pts = avio_rl64(pb);
 888                 consumed += 16;
 889                 if (wtv->pts == -1)
 890                     wtv->pts = AV_NOPTS_VALUE;
 891                 else {
 892                     wtv->last_valid_pts = wtv->pts;
 893                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
 894                         wtv->epoch = wtv->pts;
 895                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 896 #define WTV_PAD8(x) (((x) + 7) & ~7)
 897                     avio_skip(pb, WTV_PAD8(len) - consumed);
 898                     return 0;
 899                 }
 900                 }
 901             }
 902         } else if (!ff_guidcmp(g, data_guid)) {
 903             int stream_index = ff_find_stream_index(s, sid);
 904             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
 905                 WtvStream *wst = s->streams[stream_index]->priv_data;
 906                 wst->seen_data = 1;
 907                 if (len_ptr) {
 908                     *len_ptr = len;
 909                 }
 910                 return stream_index;
 911             }
 912         } else if (
 913             !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}) ||
 914             !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}) ||
 915             !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}) ||
 916             !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}) ||
 917             !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}) ||
 918             !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}) ||
 919             !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}) ||
 920             !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}) ||
 921             !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}) ||
 922             !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}) ||
 923             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 924             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 925             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 926             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 927             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 928             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 929             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 930             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 931             //ignore known guids
 932         } else
 933             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
 934
 935         avio_skip(pb, WTV_PAD8(len) - consumed);
 936     }
 937     return AVERROR_EOF;
 938 }
 939
 940 /* declare utf16le strings */
 941 #define _ , 0,
 942 static const uint8_t timeline_le16[] =
 943     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
 944 static const uint8_t table_0_entries_legacy_attrib_le16[] =
 945     {'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};
 946 static const uint8_t table_0_entries_time_le16[] =
 947     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
 948 static const uint8_t timeline_table_0_entries_Events_le16[] =
 949     {'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};
 950 #undef _
 951
 952 static int read_header(AVFormatContext *s)
 953 {
 954     WtvContext *wtv = s->priv_data;
 955     int root_sector, root_size;
 956     uint8_t root[WTV_SECTOR_SIZE];
 957     AVIOContext *pb;
 958     int64_t timeline_pos;
 959     int ret;
 960
 961     wtv->epoch          =
 962     wtv->pts            =
 963     wtv->last_valid_pts = AV_NOPTS_VALUE;
 964
 965     /* read root directory sector */
 966     avio_skip(s->pb, 0x30);
 967     root_size = avio_rl32(s->pb);
 968     if (root_size > sizeof(root)) {
 969         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
 970         return AVERROR_INVALIDDATA;
 971     }
 972     avio_skip(s->pb, 4);
 973     root_sector = avio_rl32(s->pb);
 974
 975     seek_by_sector(s->pb, root_sector, 0);
 976     root_size = avio_read(s->pb, root, root_size);
 977     if (root_size < 0)
 978         return AVERROR_INVALIDDATA;
 979
 980     /* parse chunks up until first data chunk */
 981     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
 982     if (!wtv->pb) {
 983         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
 984         return AVERROR_INVALIDDATA;
 985     }
 986
 987     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 988     if (ret < 0)
 989         return ret;
 990     avio_seek(wtv->pb, -32, SEEK_CUR);
 991
 992     timeline_pos = avio_tell(s->pb); // save before opening another file
 993
 994     /* read metadata */
 995     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
 996     if (pb) {
 997         parse_legacy_attrib(s, pb);
 998         wtvfile_close(pb);
 999     }
1000
1001     /* read seek index */
1002     if (s->nb_streams) {
1003         AVStream *st = s->streams[0];
1004         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1005         if (pb) {
1006             while(1) {
1007                 uint64_t timestamp = avio_rl64(pb);
1008                 uint64_t frame_nb  = avio_rl64(pb);
1009                 if (pb->eof_reached)
1010                     break;
1011                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1012                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1013             }
1014             wtvfile_close(pb);
1015
1016             if (wtv->nb_index_entries) {
1017                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1018                 if (pb) {
1019                     int i;
1020                     while (1) {
1021                         uint64_t frame_nb = avio_rl64(pb);
1022                         uint64_t position = avio_rl64(pb);
1023                         if (pb->eof_reached)
1024                             break;
1025                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1026                             AVIndexEntry *e = wtv->index_entries + i;
1027                             if (frame_nb > e->size)
1028                                 break;
1029                             if (position > e->pos)
1030                                 e->pos = position;
1031                         }
1032                     }
1033                     wtvfile_close(pb);
1034                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1035                 }
1036             }
1037         }
1038     }
1039
1040     avio_seek(s->pb, timeline_pos, SEEK_SET);
1041     return 0;
1042 }
1043
1044 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1045 {
1046     WtvContext *wtv = s->priv_data;
1047     AVIOContext *pb = wtv->pb;
1048     int stream_index, len, ret;
1049
1050     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1051     if (stream_index < 0)
1052         return stream_index;
1053
1054     ret = av_get_packet(pb, pkt, len - 32);
1055     if (ret < 0)
1056         return ret;
1057     pkt->stream_index = stream_index;
1058     pkt->pts          = wtv->pts;
1059     avio_skip(pb, WTV_PAD8(len) - len);
1060     return 0;
1061 }
1062
1063 static int read_seek(AVFormatContext *s, int stream_index,
1064                      int64_t ts, int flags)
1065 {
1066     WtvContext *wtv = s->priv_data;
1067     AVIOContext *pb = wtv->pb;
1068     AVStream *st = s->streams[0];
1069     int64_t ts_relative;
1070     int i;
1071
1072     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1073         return AVERROR(ENOSYS);
1074
1075     /* timestamp adjustment is required because wtv->pts values are absolute,
1076      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1077     ts_relative = ts;
1078     if (wtv->epoch != AV_NOPTS_VALUE)
1079         ts_relative -= wtv->epoch;
1080
1081     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1082     if (i < 0) {
1083         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1084             avio_seek(pb, 0, SEEK_SET);
1085         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1086             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1087         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1088             return AVERROR(ERANGE);
1089         return 0;
1090     }
1091     wtv->pts = wtv->index_entries[i].timestamp;
1092     if (wtv->epoch != AV_NOPTS_VALUE)
1093         wtv->pts += wtv->epoch;
1094     wtv->last_valid_pts = wtv->pts;
1095     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1096     return 0;
1097 }
1098
1099 static int read_close(AVFormatContext *s)
1100 {
1101     WtvContext *wtv = s->priv_data;
1102     av_free(wtv->index_entries);
1103     wtvfile_close(wtv->pb);
1104     return 0;
1105 }
1106
1107 AVInputFormat ff_wtv_demuxer = {
1108     .name           = "wtv",
1109     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1110     .priv_data_size = sizeof(WtvContext),
1111     .read_probe     = read_probe,
1112     .read_header    = read_header,
1113     .read_packet    = read_packet,
1114     .read_seek      = read_seek,
1115     .read_close     = read_close,
1116     .flags          = AVFMT_SHOW_IDS,
1117 };