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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 "libavutil/time_internal.h"
  35 #include "avformat.h"
  36 #include "internal.h"
  37 #include "riff.h"
  38 #include "asf.h"
  39 #include "mpegts.h"
  40
  41 /* Macros for formatting GUIDs */
  42 #define PRI_PRETTY_GUID \
  43     "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
  44 #define ARG_PRETTY_GUID(g) \
  45     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]
  46 #define LEN_PRETTY_GUID 34
  47
  48 /*
  49  * File system routines
  50  */
  51
  52 #define WTV_SECTOR_BITS    12
  53 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
  54 #define WTV_BIGSECTOR_BITS 18
  55
  56 #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)
  57
  58 typedef struct WtvFile {
  59     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
  60
  61     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
  62     uint32_t *sectors;   /** file allocation table */
  63     int nb_sectors;      /** number of sectors */
  64
  65     int error;
  66     int64_t position;
  67     int64_t length;
  68 } WtvFile;
  69
  70 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
  71 {
  72     return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);
  73 }
  74
  75 /**
  76  * @return bytes read, 0 on end of file, or <0 on error
  77  */
  78 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
  79 {
  80     WtvFile *wf = opaque;
  81     AVIOContext *pb = wf->pb_filesystem;
  82     int nread = 0;
  83
  84     if (wf->error || pb->error)
  85         return -1;
  86     if (wf->position >= wf->length || pb->eof_reached)
  87         return 0;
  88
  89     buf_size = FFMIN(buf_size, wf->length - wf->position);
  90     while(nread < buf_size) {
  91         int n;
  92         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
  93         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
  94
  95         n = avio_read(pb, buf, read_request);
  96         if (n <= 0)
  97             break;
  98         nread += n;
  99         buf += n;
 100         wf->position += n;
 101         if (n == remaining_in_sector) {
 102             int i = wf->position >> wf->sector_bits;
 103             if (i >= wf->nb_sectors ||
 104                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
 105                 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
 106                 wf->error = 1;
 107                 break;
 108             }
 109         }
 110     }
 111     return nread;
 112 }
 113
 114 /**
 115  * @return position (or file length)
 116  */
 117 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
 118 {
 119     WtvFile *wf = opaque;
 120     AVIOContext *pb = wf->pb_filesystem;
 121
 122     if (whence == AVSEEK_SIZE)
 123         return wf->length;
 124     else if (whence == SEEK_CUR)
 125         offset = wf->position + offset;
 126     else if (whence == SEEK_END)
 127         offset = wf->length;
 128
 129     wf->error = offset < 0 || offset >= wf->length ||
 130                 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
 131                                offset & ((1 << wf->sector_bits) - 1)) < 0;
 132     wf->position = offset;
 133     return offset;
 134 }
 135
 136 /**
 137  * read non-zero integers (le32) from input stream
 138  * @param pb
 139  * @param[out] data destination
 140  * @param     count maximum number of integers to read
 141  * @return    total number of integers read
 142  */
 143 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
 144 {
 145     int i, total = 0;
 146     for (i = 0; i < count; i++) {
 147         if ((data[total] = avio_rl32(pb)))
 148            total++;
 149     }
 150     return total;
 151 }
 152
 153 /**
 154  * Open file
 155  * @param first_sector  First sector
 156  * @param length        Length of file (bytes)
 157  * @param depth         File allocation table depth
 158  * @return NULL on error
 159  */
 160 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
 161 {
 162     AVIOContext *pb;
 163     WtvFile *wf;
 164     uint8_t *buffer;
 165
 166     if (seek_by_sector(s->pb, first_sector, 0) < 0)
 167         return NULL;
 168
 169     wf = av_mallocz(sizeof(WtvFile));
 170     if (!wf)
 171         return NULL;
 172
 173     if (depth == 0) {
 174         wf->sectors = av_malloc(sizeof(uint32_t));
 175         if (!wf->sectors) {
 176             av_free(wf);
 177             return NULL;
 178         }
 179         wf->sectors[0]  = first_sector;
 180         wf->nb_sectors  = 1;
 181         wf->sector_bits = WTV_SECTOR_BITS;
 182     } else if (depth == 1) {
 183         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
 184         if (!wf->sectors) {
 185             av_free(wf);
 186             return NULL;
 187         }
 188         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
 189         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 190     } else if (depth == 2) {
 191         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
 192         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
 193         int i;
 194
 195         wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));
 196         if (!wf->sectors) {
 197             av_free(wf);
 198             return NULL;
 199         }
 200         wf->nb_sectors = 0;
 201         for (i = 0; i < nb_sectors1; i++) {
 202             if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
 203                 break;
 204             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
 205         }
 206         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 207     } else {
 208         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 209         av_free(wf);
 210         return NULL;
 211     }
 212
 213     if (!wf->nb_sectors) {
 214         av_free(wf->sectors);
 215         av_free(wf);
 216         return NULL;
 217     }
 218
 219     /* check length */
 220     length &= 0xFFFFFFFFFFFF;
 221     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
 222         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);
 223         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
 224     }
 225     wf->length = length;
 226
 227     /* seek to initial sector */
 228     wf->position = 0;
 229     if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
 230         av_free(wf->sectors);
 231         av_free(wf);
 232         return NULL;
 233     }
 234
 235     wf->pb_filesystem = s->pb;
 236     buffer = av_malloc(1 << wf->sector_bits);
 237     if (!buffer) {
 238         av_free(wf->sectors);
 239         av_free(wf);
 240         return NULL;
 241     }
 242
 243     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
 244                            wtvfile_read_packet, NULL, wtvfile_seek);
 245     if (!pb) {
 246         av_free(buffer);
 247         av_free(wf->sectors);
 248         av_free(wf);
 249     }
 250     return pb;
 251 }
 252
 253 static const ff_asf_guid dir_entry_guid =
 254     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
 255
 256 /**
 257  * Open file using filename
 258  * @param[in]  buf       directory buffer
 259  * @param      buf_size  directory buffer size
 260  * @param[in]  filename
 261  * @param      filename_size size of filename
 262  * @return NULL on error
 263  */
 264 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
 265 {
 266     const uint8_t *buf_end = buf + buf_size;
 267
 268     while(buf + 48 <= buf_end) {
 269         int dir_length, name_size, first_sector, depth;
 270         uint64_t file_length;
 271         const uint8_t *name;
 272         if (ff_guidcmp(buf, dir_entry_guid)) {
 273             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
 274                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
 275             break;
 276         }
 277         dir_length  = AV_RL16(buf + 16);
 278         file_length = AV_RL64(buf + 24);
 279         name_size   = 2 * AV_RL32(buf + 32);
 280         if (name_size < 0) {
 281             av_log(s, AV_LOG_ERROR,
 282                    "bad filename length, remaining directory entries ignored\n");
 283             break;
 284         }
 285         if (48 + name_size > buf_end - buf) {
 286             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
 287             break;
 288         }
 289         first_sector = AV_RL32(buf + 40 + name_size);
 290         depth        = AV_RL32(buf + 44 + name_size);
 291
 292         /* compare file name; test optional null terminator */
 293         name = buf + 40;
 294         if (name_size >= filename_size &&
 295             !memcmp(name, filename, filename_size) &&
 296             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
 297             return wtvfile_open_sector(first_sector, file_length, depth, s);
 298
 299         buf += dir_length;
 300     }
 301     return 0;
 302 }
 303
 304 #define wtvfile_open(s, buf, buf_size, filename) \
 305     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
 306
 307 /**
 308  * Close file opened with wtvfile_open_sector(), or wtv_open()
 309  */
 310 static void wtvfile_close(AVIOContext *pb)
 311 {
 312     WtvFile *wf = pb->opaque;
 313     av_free(wf->sectors);
 314     av_free(wf);
 315     av_free(pb->buffer);
 316     av_free(pb);
 317 }
 318
 319 /*
 320  * Main demuxer
 321  */
 322
 323 typedef struct WtvStream {
 324     int seen_data;
 325 } WtvStream;
 326
 327 typedef struct WtvContext {
 328     AVIOContext *pb;       /** timeline file */
 329     int64_t epoch;
 330     int64_t pts;             /** pts for next data chunk */
 331     int64_t last_valid_pts;  /** latest valid pts, used for interactive seeking */
 332
 333     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
 334        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
 335     AVIndexEntry *index_entries;
 336     int nb_index_entries;
 337     unsigned int index_entries_allocated_size;
 338 } WtvContext;
 339
 340 /* WTV GUIDs */
 341 static const ff_asf_guid wtv_guid =
 342     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 343 static const ff_asf_guid metadata_guid =
 344     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
 345 static const ff_asf_guid timestamp_guid =
 346     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
 347 static const ff_asf_guid data_guid =
 348     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 349 static const ff_asf_guid stream_guid =
 350     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
 351 static const ff_asf_guid stream2_guid =
 352     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 353 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
 354     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
 355 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
 356     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
 357 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
 358     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
 359 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
 360     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
 361 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
 362     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
 363 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
 364     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
 365 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
 366     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
 367 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
 368     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
 369 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
 370     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
 371
 372 /* Windows media GUIDs */
 373
 374 /* Media types */
 375 static const ff_asf_guid mediatype_audio =
 376     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 377 static const ff_asf_guid mediatype_video =
 378     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 379 static const ff_asf_guid mediasubtype_mpeg1payload =
 380     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 381 static const ff_asf_guid mediatype_mpeg2_sections =
 382     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 383 static const ff_asf_guid mediatype_mpeg2_pes =
 384     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 385 static const ff_asf_guid mediatype_mstvcaption =
 386     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 387
 388 /* Media subtypes */
 389 static const ff_asf_guid mediasubtype_cpfilters_processed =
 390     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 391 static const ff_asf_guid mediasubtype_dvb_subtitle =
 392     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 393 static const ff_asf_guid mediasubtype_teletext =
 394     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 395 static const ff_asf_guid mediasubtype_dtvccdata =
 396     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 397 static const ff_asf_guid mediasubtype_mpeg2_sections =
 398     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 399
 400 /* Formats */
 401 static const ff_asf_guid format_cpfilters_processed =
 402     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 403 static const ff_asf_guid format_waveformatex =
 404     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 405 static const ff_asf_guid format_videoinfo2 =
 406     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 407 static const ff_asf_guid format_mpeg2_video =
 408     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 409 static const ff_asf_guid format_none =
 410     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 411
 412 static const AVCodecGuid video_guids[] = {
 413     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 414     {AV_CODEC_ID_NONE}
 415 };
 416
 417 static int read_probe(AVProbeData *p)
 418 {
 419     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 420 }
 421
 422 /**
 423  * Convert win32 FILETIME to ISO-8601 string
 424  */
 425 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
 426 {
 427     time_t t = (value / 10000000LL) - 11644473600LL;
 428     struct tm tmbuf;
 429     struct tm *tm = gmtime_r(&t, &tmbuf);
 430     if (tm) {
 431         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
 432             buf[0] = '\0';
 433     } else
 434         buf[0] = '\0';
 435 }
 436
 437 /**
 438  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
 439  */
 440 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
 441 {
 442     time_t t = (value / 10000000LL) - 719162LL*86400LL;
 443     struct tm tmbuf;
 444     struct tm *tm = gmtime_r(&t, &tmbuf);
 445     if (tm) {
 446         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
 447             buf[0] = '\0';
 448     } else
 449         buf[0] = '\0';
 450 }
 451
 452 /**
 453  * Convert OLE DATE to ISO-8601 string
 454  */
 455 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
 456 {
 457     time_t t = 631112400LL + 86400*av_int2double(value);
 458     struct tm tmbuf;
 459     struct tm *tm = gmtime_r(&t, &tmbuf);
 460     if (tm) {
 461         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
 462             buf[0] = '\0';
 463     } else
 464         buf[0] = '\0';
 465 }
 466
 467 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
 468 {
 469     char mime[1024];
 470     char description[1024];
 471     unsigned int filesize;
 472     AVStream *st;
 473     int64_t pos = avio_tell(pb);
 474
 475     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
 476     if (strcmp(mime, "image/jpeg"))
 477         goto done;
 478
 479     avio_r8(pb);
 480     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
 481     filesize = avio_rl32(pb);
 482     if (!filesize)
 483         goto done;
 484
 485     st = avformat_new_stream(s, NULL);
 486     if (!st)
 487         goto done;
 488     av_dict_set(&st->metadata, "title", description, 0);
 489     st->codecpar->codec_id   = AV_CODEC_ID_MJPEG;
 490     st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
 491     st->codecpar->extradata  = av_mallocz(filesize);
 492     st->id = -1;
 493     if (!st->codecpar->extradata)
 494         goto done;
 495     st->codecpar->extradata_size = filesize;
 496     avio_read(pb, st->codecpar->extradata, filesize);
 497 done:
 498     avio_seek(pb, pos + length, SEEK_SET);
 499 }
 500
 501 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
 502 {
 503     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
 504     char *buf = av_malloc(buf_size);
 505     if (!buf)
 506         return;
 507
 508     if (type == 0 && length == 4) {
 509         snprintf(buf, buf_size, "%u", avio_rl32(pb));
 510     } else if (type == 1) {
 511         avio_get_str16le(pb, length, buf, buf_size);
 512         if (!strlen(buf)) {
 513            av_free(buf);
 514            return;
 515         }
 516     } else if (type == 3 && length == 4) {
 517         strcpy(buf, avio_rl32(pb) ? "true" : "false");
 518     } else if (type == 4 && length == 8) {
 519         int64_t num = avio_rl64(pb);
 520         if (!strcmp(key, "WM/EncodingTime") ||
 521             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
 522             filetime_to_iso8601(buf, buf_size, num);
 523         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
 524                  !strcmp(key, "WM/WMRVEndTime"))
 525             crazytime_to_iso8601(buf, buf_size, num);
 526         else if (!strcmp(key, "WM/WMRVExpirationDate"))
 527             oledate_to_iso8601(buf, buf_size, num);
 528         else if (!strcmp(key, "WM/WMRVBitrate"))
 529             snprintf(buf, buf_size, "%f", av_int2double(num));
 530         else
 531             snprintf(buf, buf_size, "%"PRIi64, num);
 532     } else if (type == 5 && length == 2) {
 533         snprintf(buf, buf_size, "%u", avio_rl16(pb));
 534     } else if (type == 6 && length == 16) {
 535         ff_asf_guid guid;
 536         avio_read(pb, guid, 16);
 537         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
 538     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
 539         get_attachment(s, pb, length);
 540         av_freep(&buf);
 541         return;
 542     } else {
 543         av_freep(&buf);
 544         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
 545         avio_skip(pb, length);
 546         return;
 547     }
 548
 549     av_dict_set(&s->metadata, key, buf, 0);
 550     av_freep(&buf);
 551 }
 552
 553 /**
 554  * Parse metadata entries
 555  */
 556 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
 557 {
 558     ff_asf_guid guid;
 559     int length, type;
 560     while(!pb->eof_reached) {
 561         char key[1024];
 562         ff_get_guid(pb, &guid);
 563         type   = avio_rl32(pb);
 564         length = avio_rl32(pb);
 565         if (!length)
 566             break;
 567         if (ff_guidcmp(&guid, metadata_guid)) {
 568             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
 569                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
 570             break;
 571         }
 572         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
 573         get_tag(s, pb, key, type, length);
 574     }
 575
 576     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 577 }
 578
 579 /**
 580  * parse VIDEOINFOHEADER2 structure
 581  * @return bytes consumed
 582  */
 583 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 584 {
 585     WtvContext *wtv = s->priv_data;
 586     AVIOContext *pb = wtv->pb;
 587
 588     avio_skip(pb, 72);  // picture aspect ratio is unreliable
 589     ff_get_bmp_header(pb, st);
 590
 591     return 72 + 40;
 592 }
 593
 594 /**
 595  * Parse MPEG1WAVEFORMATEX extradata structure
 596  */
 597 static void parse_mpeg1waveformatex(AVStream *st)
 598 {
 599     /* fwHeadLayer */
 600     switch (AV_RL16(st->codecpar->extradata)) {
 601     case 0x0001 : st->codecpar->codec_id = AV_CODEC_ID_MP1; break;
 602     case 0x0002 : st->codecpar->codec_id = AV_CODEC_ID_MP2; break;
 603     case 0x0004 : st->codecpar->codec_id = AV_CODEC_ID_MP3; break;
 604     }
 605
 606     st->codecpar->bit_rate = AV_RL32(st->codecpar->extradata + 2); /* dwHeadBitrate */
 607
 608     /* dwHeadMode */
 609     switch (AV_RL16(st->codecpar->extradata + 6)) {
 610     case 1 :
 611     case 2 :
 612     case 4 : st->codecpar->channels       = 2;
 613              st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
 614              break;
 615     case 8 : st->codecpar->channels       = 1;
 616              st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
 617              break;
 618     }
 619 }
 620
 621 /**
 622  * Initialise stream
 623  * @param st Stream to initialise, or NULL to create and initialise new stream
 624  * @return NULL on error
 625  */
 626 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
 627 {
 628     if (st) {
 629         if (st->codecpar->extradata) {
 630             av_freep(&st->codecpar->extradata);
 631             st->codecpar->extradata_size = 0;
 632         }
 633     } else {
 634         WtvStream *wst = av_mallocz(sizeof(WtvStream));
 635         if (!wst)
 636             return NULL;
 637         st = avformat_new_stream(s, NULL);
 638         if (!st) {
 639             av_free(wst);
 640             return NULL;
 641         }
 642         st->id = sid;
 643         st->priv_data = wst;
 644     }
 645     st->codecpar->codec_type = codec_type;
 646     st->need_parsing      = AVSTREAM_PARSE_FULL;
 647     avpriv_set_pts_info(st, 64, 1, 10000000);
 648     return st;
 649 }
 650
 651 /**
 652  * parse Media Type structure and populate stream
 653  * @param st         Stream, or NULL to create new stream
 654  * @param mediatype  Mediatype GUID
 655  * @param subtype    Subtype GUID
 656  * @param formattype Format GUID
 657  * @param size       Size of format buffer
 658  * @return NULL on error
 659  */
 660 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
 661                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 662                                    ff_asf_guid formattype, int size)
 663 {
 664     WtvContext *wtv = s->priv_data;
 665     AVIOContext *pb = wtv->pb;
 666     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 667         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 668         ff_asf_guid actual_subtype;
 669         ff_asf_guid actual_formattype;
 670
 671         if (size < 32) {
 672             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 673             avio_skip(pb, size);
 674             return NULL;
 675         }
 676
 677         avio_skip(pb, size - 32);
 678         ff_get_guid(pb, &actual_subtype);
 679         ff_get_guid(pb, &actual_formattype);
 680         avio_seek(pb, -size, SEEK_CUR);
 681
 682         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 683         avio_skip(pb, 32);
 684         return st;
 685     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 686         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
 687         if (!st)
 688             return NULL;
 689         if (!ff_guidcmp(formattype, format_waveformatex)) {
 690             int ret = ff_get_wav_header(s, pb, st->codecpar, size);
 691             if (ret < 0)
 692                 return NULL;
 693         } else {
 694             if (ff_guidcmp(formattype, format_none))
 695                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 696             avio_skip(pb, size);
 697         }
 698
 699         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 700             st->codecpar->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codecpar->bits_per_coded_sample);
 701         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 702             if (st->codecpar->extradata && st->codecpar->extradata_size >= 22)
 703                 parse_mpeg1waveformatex(st);
 704             else
 705                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 706         } else {
 707             st->codecpar->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
 708             if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
 709                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 710         }
 711         return st;
 712     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 713         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
 714         if (!st)
 715             return NULL;
 716         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 717             int consumed = parse_videoinfoheader2(s, st);
 718             avio_skip(pb, FFMAX(size - consumed, 0));
 719         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 720             int consumed = parse_videoinfoheader2(s, st);
 721             avio_skip(pb, FFMAX(size - consumed, 0));
 722         } else {
 723             if (ff_guidcmp(formattype, format_none))
 724                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 725             avio_skip(pb, size);
 726         }
 727
 728         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 729             st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 730         } else {
 731             st->codecpar->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 732         }
 733         if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
 734             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 735         return st;
 736     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 737                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 738         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 739         if (!st)
 740             return NULL;
 741         if (ff_guidcmp(formattype, format_none))
 742             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 743         avio_skip(pb, size);
 744         st->codecpar->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
 745         return st;
 746     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 747                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 748         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 749         if (!st)
 750             return NULL;
 751         if (ff_guidcmp(formattype, format_none))
 752             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 753         avio_skip(pb, size);
 754         st->codecpar->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
 755         return st;
 756     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 757                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 758         if (ff_guidcmp(formattype, format_none))
 759             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 760         avio_skip(pb, size);
 761         return NULL;
 762     }
 763
 764     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
 765                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
 766                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
 767     avio_skip(pb, size);
 768     return NULL;
 769 }
 770
 771 enum {
 772     SEEK_TO_DATA = 0,
 773     SEEK_TO_PTS,
 774 };
 775
 776 /**
 777  * Parse WTV chunks
 778  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
 779  * @param seekts timestamp
 780  * @param[out] len_ptr Length of data chunk
 781  * @return stream index of data chunk, or <0 on error
 782  */
 783 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 784 {
 785     WtvContext *wtv = s->priv_data;
 786     AVIOContext *pb = wtv->pb;
 787     while (!pb->eof_reached) {
 788         ff_asf_guid g;
 789         int len, sid, consumed;
 790
 791         ff_get_guid(pb, &g);
 792         len = avio_rl32(pb);
 793         if (len < 32)
 794             break;
 795         sid = avio_rl32(pb) & 0x7FFF;
 796         avio_skip(pb, 8);
 797         consumed = 32;
 798
 799         if (!ff_guidcmp(g, stream_guid)) {
 800             if (ff_find_stream_index(s, sid) < 0) {
 801                 ff_asf_guid mediatype, subtype, formattype;
 802                 int size;
 803                 avio_skip(pb, 28);
 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, 0, sid, mediatype, subtype, formattype, size);
 810                 consumed += 92 + size;
 811             }
 812         } else if (!ff_guidcmp(g, stream2_guid)) {
 813             int stream_index = ff_find_stream_index(s, sid);
 814             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
 815                 ff_asf_guid mediatype, subtype, formattype;
 816                 int size;
 817                 avio_skip(pb, 12);
 818                 ff_get_guid(pb, &mediatype);
 819                 ff_get_guid(pb, &subtype);
 820                 avio_skip(pb, 12);
 821                 ff_get_guid(pb, &formattype);
 822                 size = avio_rl32(pb);
 823                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
 824                 consumed += 76 + size;
 825             }
 826         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 827                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 828                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 829                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 830                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 831                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 832             int stream_index = ff_find_stream_index(s, sid);
 833             if (stream_index >= 0) {
 834                 AVStream *st = s->streams[stream_index];
 835                 uint8_t buf[258];
 836                 const uint8_t *pbuf = buf;
 837                 int buf_size;
 838
 839                 avio_skip(pb, 8);
 840                 consumed += 8;
 841                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 842                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 843                     avio_skip(pb, 6);
 844                     consumed += 6;
 845                 }
 846
 847                 buf_size = FFMIN(len - consumed, sizeof(buf));
 848                 avio_read(pb, buf, buf_size);
 849                 consumed += buf_size;
 850                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
 851             }
 852         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
 853             int stream_index = ff_find_stream_index(s, sid);
 854             if (stream_index >= 0) {
 855                 AVStream *st = s->streams[stream_index];
 856                 int audio_type;
 857                 avio_skip(pb, 8);
 858                 audio_type = avio_r8(pb);
 859                 if (audio_type == 2)
 860                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
 861                 else if (audio_type == 3)
 862                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 863                 consumed += 9;
 864             }
 865         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 866             int stream_index = ff_find_stream_index(s, sid);
 867             if (stream_index >= 0) {
 868                 avio_skip(pb, 12);
 869                 if (avio_rl32(pb))
 870                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 871                 consumed += 16;
 872             }
 873         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 874             int stream_index = ff_find_stream_index(s, sid);
 875             if (stream_index >= 0) {
 876                 AVStream *st = s->streams[stream_index];
 877                 uint8_t language[4];
 878                 avio_skip(pb, 12);
 879                 avio_read(pb, language, 3);
 880                 if (language[0]) {
 881                     language[3] = 0;
 882                     av_dict_set(&st->metadata, "language", language, 0);
 883                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
 884                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 885                 }
 886                 consumed += 15;
 887             }
 888         } else if (!ff_guidcmp(g, timestamp_guid)) {
 889             int stream_index = ff_find_stream_index(s, sid);
 890             if (stream_index >= 0) {
 891                 avio_skip(pb, 8);
 892                 wtv->pts = avio_rl64(pb);
 893                 consumed += 16;
 894                 if (wtv->pts == -1)
 895                     wtv->pts = AV_NOPTS_VALUE;
 896                 else {
 897                     wtv->last_valid_pts = wtv->pts;
 898                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
 899                         wtv->epoch = wtv->pts;
 900                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 901 #define WTV_PAD8(x) (((x) + 7) & ~7)
 902                     avio_skip(pb, WTV_PAD8(len) - consumed);
 903                     return 0;
 904                 }
 905                 }
 906             }
 907         } else if (!ff_guidcmp(g, data_guid)) {
 908             int stream_index = ff_find_stream_index(s, sid);
 909             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
 910                 WtvStream *wst = s->streams[stream_index]->priv_data;
 911                 wst->seen_data = 1;
 912                 if (len_ptr) {
 913                     *len_ptr = len;
 914                 }
 915                 return stream_index;
 916             }
 917         } else if (
 918             !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}) ||
 919             !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}) ||
 920             !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}) ||
 921             !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}) ||
 922             !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}) ||
 923             !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}) ||
 924             !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}) ||
 925             !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}) ||
 926             !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}) ||
 927             !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}) ||
 928             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 929             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 930             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 931             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 932             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 933             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 934             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 935             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 936             //ignore known guids
 937         } else
 938             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
 939
 940         avio_skip(pb, WTV_PAD8(len) - consumed);
 941     }
 942     return AVERROR_EOF;
 943 }
 944
 945 /* declare utf16le strings */
 946 #define _ , 0,
 947 static const uint8_t timeline_le16[] =
 948     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
 949 static const uint8_t table_0_entries_legacy_attrib_le16[] =
 950     {'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};
 951 static const uint8_t table_0_entries_time_le16[] =
 952     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
 953 static const uint8_t timeline_table_0_entries_Events_le16[] =
 954     {'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};
 955 #undef _
 956
 957 static int read_header(AVFormatContext *s)
 958 {
 959     WtvContext *wtv = s->priv_data;
 960     int root_sector, root_size;
 961     uint8_t root[WTV_SECTOR_SIZE];
 962     AVIOContext *pb;
 963     int64_t timeline_pos;
 964     int ret;
 965
 966     wtv->epoch          =
 967     wtv->pts            =
 968     wtv->last_valid_pts = AV_NOPTS_VALUE;
 969
 970     /* read root directory sector */
 971     avio_skip(s->pb, 0x30);
 972     root_size = avio_rl32(s->pb);
 973     if (root_size > sizeof(root)) {
 974         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
 975         return AVERROR_INVALIDDATA;
 976     }
 977     avio_skip(s->pb, 4);
 978     root_sector = avio_rl32(s->pb);
 979
 980     ret = seek_by_sector(s->pb, root_sector, 0);
 981     if (ret < 0)
 982         return ret;
 983     root_size = avio_read(s->pb, root, root_size);
 984     if (root_size < 0)
 985         return AVERROR_INVALIDDATA;
 986
 987     /* parse chunks up until first data chunk */
 988     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
 989     if (!wtv->pb) {
 990         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
 991         return AVERROR_INVALIDDATA;
 992     }
 993
 994     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 995     if (ret < 0)
 996         return ret;
 997     avio_seek(wtv->pb, -32, SEEK_CUR);
 998
 999     timeline_pos = avio_tell(s->pb); // save before opening another file
1000
1001     /* read metadata */
1002     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
1003     if (pb) {
1004         parse_legacy_attrib(s, pb);
1005         wtvfile_close(pb);
1006     }
1007
1008     /* read seek index */
1009     if (s->nb_streams) {
1010         AVStream *st = s->streams[0];
1011         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1012         if (pb) {
1013             while(1) {
1014                 uint64_t timestamp = avio_rl64(pb);
1015                 uint64_t frame_nb  = avio_rl64(pb);
1016                 if (pb->eof_reached)
1017                     break;
1018                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1019                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1020             }
1021             wtvfile_close(pb);
1022
1023             if (wtv->nb_index_entries) {
1024                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1025                 if (pb) {
1026                     int i;
1027                     while (1) {
1028                         uint64_t frame_nb = avio_rl64(pb);
1029                         uint64_t position = avio_rl64(pb);
1030                         if (pb->eof_reached)
1031                             break;
1032                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1033                             AVIndexEntry *e = wtv->index_entries + i;
1034                             if (frame_nb > e->size)
1035                                 break;
1036                             if (position > e->pos)
1037                                 e->pos = position;
1038                         }
1039                     }
1040                     wtvfile_close(pb);
1041                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1042                 }
1043             }
1044         }
1045     }
1046
1047     avio_seek(s->pb, timeline_pos, SEEK_SET);
1048     return 0;
1049 }
1050
1051 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1052 {
1053     WtvContext *wtv = s->priv_data;
1054     AVIOContext *pb = wtv->pb;
1055     int stream_index, len, ret;
1056
1057     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1058     if (stream_index < 0)
1059         return stream_index;
1060
1061     ret = av_get_packet(pb, pkt, len - 32);
1062     if (ret < 0)
1063         return ret;
1064     pkt->stream_index = stream_index;
1065     pkt->pts          = wtv->pts;
1066     avio_skip(pb, WTV_PAD8(len) - len);
1067     return 0;
1068 }
1069
1070 static int read_seek(AVFormatContext *s, int stream_index,
1071                      int64_t ts, int flags)
1072 {
1073     WtvContext *wtv = s->priv_data;
1074     AVIOContext *pb = wtv->pb;
1075     AVStream *st = s->streams[0];
1076     int64_t ts_relative;
1077     int i;
1078
1079     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1080         return AVERROR(ENOSYS);
1081
1082     /* timestamp adjustment is required because wtv->pts values are absolute,
1083      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1084     ts_relative = ts;
1085     if (wtv->epoch != AV_NOPTS_VALUE)
1086         ts_relative -= wtv->epoch;
1087
1088     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1089     if (i < 0) {
1090         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1091             avio_seek(pb, 0, SEEK_SET);
1092         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1093             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1094         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1095             return AVERROR(ERANGE);
1096         return 0;
1097     }
1098     wtv->pts = wtv->index_entries[i].timestamp;
1099     if (wtv->epoch != AV_NOPTS_VALUE)
1100         wtv->pts += wtv->epoch;
1101     wtv->last_valid_pts = wtv->pts;
1102     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1103     return 0;
1104 }
1105
1106 static int read_close(AVFormatContext *s)
1107 {
1108     WtvContext *wtv = s->priv_data;
1109     av_free(wtv->index_entries);
1110     wtvfile_close(wtv->pb);
1111     return 0;
1112 }
1113
1114 AVInputFormat ff_wtv_demuxer = {
1115     .name           = "wtv",
1116     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1117     .priv_data_size = sizeof(WtvContext),
1118     .read_probe     = read_probe,
1119     .read_header    = read_header,
1120     .read_packet    = read_packet,
1121     .read_seek      = read_seek,
1122     .read_close     = read_close,
1123     .flags          = AVFMT_SHOW_IDS,
1124 };