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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 formating 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  *
  50  * File system routines
  51  *
  52  */
  53
  54 #define WTV_SECTOR_BITS    12
  55 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
  56 #define WTV_BIGSECTOR_BITS 18
  57
  58 #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)
  59
  60 typedef struct WtvFile {
  61     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
  62
  63     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
  64     uint32_t *sectors;   /** file allocation table */
  65     int nb_sectors;      /** number of sectors */
  66
  67     int error;
  68     int64_t position;
  69     int64_t length;
  70 } WtvFile;
  71
  72 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
  73 {
  74     return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);
  75 }
  76
  77 /**
  78  * @return bytes read, 0 on end of file, or <0 on error
  79  */
  80 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
  81 {
  82     WtvFile *wf = opaque;
  83     AVIOContext *pb = wf->pb_filesystem;
  84     int nread = 0;
  85
  86     if (wf->error || pb->error)
  87         return -1;
  88     if (wf->position >= wf->length || pb->eof_reached)
  89         return 0;
  90
  91     buf_size = FFMIN(buf_size, wf->length - wf->position);
  92     while(nread < buf_size) {
  93         int n;
  94         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
  95         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
  96
  97         n = avio_read(pb, buf, read_request);
  98         if (n <= 0)
  99             break;
 100         nread += n;
 101         buf += n;
 102         wf->position += n;
 103         if (n == remaining_in_sector) {
 104             int i = wf->position >> wf->sector_bits;
 105             if (i >= wf->nb_sectors ||
 106                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
 107                 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
 108                 wf->error = 1;
 109                 break;
 110             }
 111         }
 112     }
 113     return nread;
 114 }
 115
 116 /**
 117  * @return position (or file length)
 118  */
 119 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
 120 {
 121     WtvFile *wf = opaque;
 122     AVIOContext *pb = wf->pb_filesystem;
 123
 124     if (whence == AVSEEK_SIZE)
 125         return wf->length;
 126     else if (whence == SEEK_CUR)
 127         offset = wf->position + offset;
 128     else if (whence == SEEK_END)
 129         offset = wf->length;
 130
 131     wf->error = offset < 0 || offset >= wf->length ||
 132                 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
 133                                offset & ((1 << wf->sector_bits) - 1)) < 0;
 134     wf->position = offset;
 135     return offset;
 136 }
 137
 138 /**
 139  * read non-zero integers (le32) from input stream
 140  * @param pb
 141  * @param[out] data destination
 142  * @param     count maximum number of integers to read
 143  * @return    total number of integers read
 144  */
 145 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
 146 {
 147     int i, total = 0;
 148     for (i = 0; i < count; i++) {
 149         if ((data[total] = avio_rl32(pb)))
 150            total++;
 151     }
 152     return total;
 153 }
 154
 155 /**
 156  * Open file
 157  * @param first_sector  First sector
 158  * @param length        Length of file (bytes)
 159  * @param depth         File allocation table depth
 160  * @return NULL on error
 161  */
 162 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
 163 {
 164     AVIOContext *pb;
 165     WtvFile *wf;
 166     uint8_t *buffer;
 167
 168     if (seek_by_sector(s->pb, first_sector, 0) < 0)
 169         return NULL;
 170
 171     wf = av_mallocz(sizeof(WtvFile));
 172     if (!wf)
 173         return NULL;
 174
 175     if (depth == 0) {
 176         wf->sectors = av_malloc(sizeof(uint32_t));
 177         if (!wf->sectors) {
 178             av_free(wf);
 179             return NULL;
 180         }
 181         wf->sectors[0]  = first_sector;
 182         wf->nb_sectors  = 1;
 183         wf->sector_bits = WTV_SECTOR_BITS;
 184     } else if (depth == 1) {
 185         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
 186         if (!wf->sectors) {
 187             av_free(wf);
 188             return NULL;
 189         }
 190         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
 191         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 192     } else if (depth == 2) {
 193         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
 194         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
 195         int i;
 196
 197         wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));
 198         if (!wf->sectors) {
 199             av_free(wf);
 200             return NULL;
 201         }
 202         wf->nb_sectors = 0;
 203         for (i = 0; i < nb_sectors1; i++) {
 204             if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
 205                 break;
 206             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
 207         }
 208         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 209     } else {
 210         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 211         av_free(wf);
 212         return NULL;
 213     }
 214
 215     if (!wf->nb_sectors) {
 216         av_free(wf->sectors);
 217         av_free(wf);
 218         return NULL;
 219     }
 220
 221     /* check length */
 222     length &= 0xFFFFFFFFFFFF;
 223     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
 224         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);
 225         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
 226     }
 227     wf->length = length;
 228
 229     /* seek to initial sector */
 230     wf->position = 0;
 231     if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
 232         av_free(wf->sectors);
 233         av_free(wf);
 234         return NULL;
 235     }
 236
 237     wf->pb_filesystem = s->pb;
 238     buffer = av_malloc(1 << wf->sector_bits);
 239     if (!buffer) {
 240         av_free(wf->sectors);
 241         av_free(wf);
 242         return NULL;
 243     }
 244
 245     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
 246                            wtvfile_read_packet, NULL, wtvfile_seek);
 247     if (!pb) {
 248         av_free(buffer);
 249         av_free(wf->sectors);
 250         av_free(wf);
 251     }
 252     return pb;
 253 }
 254
 255 static const ff_asf_guid dir_entry_guid =
 256     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
 257
 258 /**
 259  * Open file using filename
 260  * @param[in]  buf       directory buffer
 261  * @param      buf_size  directory buffer size
 262  * @param[in]  filename
 263  * @param      filename_size size of filename
 264  * @return NULL on error
 265  */
 266 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
 267 {
 268     const uint8_t *buf_end = buf + buf_size;
 269
 270     while(buf + 48 <= buf_end) {
 271         int dir_length, name_size, first_sector, depth;
 272         uint64_t file_length;
 273         const uint8_t *name;
 274         if (ff_guidcmp(buf, dir_entry_guid)) {
 275             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
 276                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
 277             break;
 278         }
 279         dir_length  = AV_RL16(buf + 16);
 280         file_length = AV_RL64(buf + 24);
 281         name_size   = 2 * AV_RL32(buf + 32);
 282         if (name_size < 0) {
 283             av_log(s, AV_LOG_ERROR,
 284                    "bad filename length, remaining directory entries ignored\n");
 285             break;
 286         }
 287         if (48 + name_size > buf_end - buf) {
 288             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
 289             break;
 290         }
 291         first_sector = AV_RL32(buf + 40 + name_size);
 292         depth        = AV_RL32(buf + 44 + name_size);
 293
 294         /* compare file name; test optional null terminator */
 295         name = buf + 40;
 296         if (name_size >= filename_size &&
 297             !memcmp(name, filename, filename_size) &&
 298             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
 299             return wtvfile_open_sector(first_sector, file_length, depth, s);
 300
 301         buf += dir_length;
 302     }
 303     return 0;
 304 }
 305
 306 #define wtvfile_open(s, buf, buf_size, filename) \
 307     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
 308
 309 /**
 310  * Close file opened with wtvfile_open_sector(), or wtv_open()
 311  */
 312 static void wtvfile_close(AVIOContext *pb)
 313 {
 314     WtvFile *wf = pb->opaque;
 315     av_free(wf->sectors);
 316     av_free(wf);
 317     av_free(pb->buffer);
 318     av_free(pb);
 319 }
 320
 321 /*
 322  *
 323  * Main demuxer
 324  *
 325  */
 326
 327 typedef struct WtvStream {
 328     int seen_data;
 329 } WtvStream;
 330
 331 typedef struct WtvContext {
 332     AVIOContext *pb;       /** timeline file */
 333     int64_t epoch;
 334     int64_t pts;             /** pts for next data chunk */
 335     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
 336
 337     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
 338        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
 339     AVIndexEntry *index_entries;
 340     int nb_index_entries;
 341     unsigned int index_entries_allocated_size;
 342 } WtvContext;
 343
 344 /* WTV GUIDs */
 345 static const ff_asf_guid wtv_guid =
 346     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 347 static const ff_asf_guid metadata_guid =
 348     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
 349 static const ff_asf_guid timestamp_guid =
 350     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
 351 static const ff_asf_guid data_guid =
 352     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 353 static const ff_asf_guid stream_guid =
 354     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
 355 static const ff_asf_guid stream2_guid =
 356     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 357 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
 358     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
 359 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
 360     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
 361 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
 362     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
 363 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
 364     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
 365 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
 366     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
 367 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
 368     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
 369 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
 370     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
 371 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
 372     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
 373 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
 374     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
 375
 376 /* Windows media GUIDs */
 377
 378 /* Media types */
 379 static const ff_asf_guid mediatype_audio =
 380     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 381 static const ff_asf_guid mediatype_video =
 382     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 383 static const ff_asf_guid mediasubtype_mpeg1payload =
 384     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 385 static const ff_asf_guid mediatype_mpeg2_sections =
 386     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 387 static const ff_asf_guid mediatype_mpeg2_pes =
 388     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 389 static const ff_asf_guid mediatype_mstvcaption =
 390     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 391
 392 /* Media subtypes */
 393 static const ff_asf_guid mediasubtype_cpfilters_processed =
 394     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 395 static const ff_asf_guid mediasubtype_dvb_subtitle =
 396     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 397 static const ff_asf_guid mediasubtype_teletext =
 398     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 399 static const ff_asf_guid mediasubtype_dtvccdata =
 400     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 401 static const ff_asf_guid mediasubtype_mpeg2_sections =
 402     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 403
 404 /* Formats */
 405 static const ff_asf_guid format_cpfilters_processed =
 406     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 407 static const ff_asf_guid format_waveformatex =
 408     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 409 static const ff_asf_guid format_videoinfo2 =
 410     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 411 static const ff_asf_guid format_mpeg2_video =
 412     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 413 static const ff_asf_guid format_none =
 414     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 415
 416 static const AVCodecGuid video_guids[] = {
 417     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 418     {AV_CODEC_ID_NONE}
 419 };
 420
 421 static int read_probe(AVProbeData *p)
 422 {
 423     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 424 }
 425
 426 /**
 427  * Convert win32 FILETIME to ISO-8601 string
 428  */
 429 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
 430 {
 431     time_t t = (value / 10000000LL) - 11644473600LL;
 432     struct tm tmbuf;
 433     struct tm *tm = gmtime_r(&t, &tmbuf);
 434     if (tm) {
 435         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
 436             buf[0] = '\0';
 437     } else
 438         buf[0] = '\0';
 439 }
 440
 441 /**
 442  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
 443  */
 444 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
 445 {
 446     time_t t = (value / 10000000LL) - 719162LL*86400LL;
 447     struct tm tmbuf;
 448     struct tm *tm = gmtime_r(&t, &tmbuf);
 449     if (tm) {
 450         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
 451             buf[0] = '\0';
 452     } else
 453         buf[0] = '\0';
 454 }
 455
 456 /**
 457  * Convert OLE DATE to ISO-8601 string
 458  */
 459 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
 460 {
 461     time_t t = 631112400LL + 86400*av_int2double(value);
 462     struct tm tmbuf;
 463     struct tm *tm = gmtime_r(&t, &tmbuf);
 464     if (tm) {
 465         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
 466             buf[0] = '\0';
 467     } else
 468         buf[0] = '\0';
 469 }
 470
 471 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
 472 {
 473     char mime[1024];
 474     char description[1024];
 475     unsigned int filesize;
 476     AVStream *st;
 477     int64_t pos = avio_tell(pb);
 478
 479     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
 480     if (strcmp(mime, "image/jpeg"))
 481         goto done;
 482
 483     avio_r8(pb);
 484     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
 485     filesize = avio_rl32(pb);
 486     if (!filesize)
 487         goto done;
 488
 489     st = avformat_new_stream(s, NULL);
 490     if (!st)
 491         goto done;
 492     av_dict_set(&st->metadata, "title", description, 0);
 493     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
 494     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
 495     st->codec->extradata  = av_mallocz(filesize);
 496     st->id = -1;
 497     if (!st->codec->extradata)
 498         goto done;
 499     st->codec->extradata_size = filesize;
 500     avio_read(pb, st->codec->extradata, filesize);
 501 done:
 502     avio_seek(pb, pos + length, SEEK_SET);
 503 }
 504
 505 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
 506 {
 507     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
 508     char *buf = av_malloc(buf_size);
 509     if (!buf)
 510         return;
 511
 512     if (type == 0 && length == 4) {
 513         snprintf(buf, buf_size, "%u", avio_rl32(pb));
 514     } else if (type == 1) {
 515         avio_get_str16le(pb, length, buf, buf_size);
 516         if (!strlen(buf)) {
 517            av_free(buf);
 518            return;
 519         }
 520     } else if (type == 3 && length == 4) {
 521         strcpy(buf, avio_rl32(pb) ? "true" : "false");
 522     } else if (type == 4 && length == 8) {
 523         int64_t num = avio_rl64(pb);
 524         if (!strcmp(key, "WM/EncodingTime") ||
 525             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
 526             filetime_to_iso8601(buf, buf_size, num);
 527         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
 528                  !strcmp(key, "WM/WMRVEndTime"))
 529             crazytime_to_iso8601(buf, buf_size, num);
 530         else if (!strcmp(key, "WM/WMRVExpirationDate"))
 531             oledate_to_iso8601(buf, buf_size, num);
 532         else if (!strcmp(key, "WM/WMRVBitrate"))
 533             snprintf(buf, buf_size, "%f", av_int2double(num));
 534         else
 535             snprintf(buf, buf_size, "%"PRIi64, num);
 536     } else if (type == 5 && length == 2) {
 537         snprintf(buf, buf_size, "%u", avio_rl16(pb));
 538     } else if (type == 6 && length == 16) {
 539         ff_asf_guid guid;
 540         avio_read(pb, guid, 16);
 541         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
 542     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
 543         get_attachment(s, pb, length);
 544         av_freep(&buf);
 545         return;
 546     } else {
 547         av_freep(&buf);
 548         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
 549         avio_skip(pb, length);
 550         return;
 551     }
 552
 553     av_dict_set(&s->metadata, key, buf, 0);
 554     av_freep(&buf);
 555 }
 556
 557 /**
 558  * Parse metadata entries
 559  */
 560 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
 561 {
 562     ff_asf_guid guid;
 563     int length, type;
 564     while(!pb->eof_reached) {
 565         char key[1024];
 566         ff_get_guid(pb, &guid);
 567         type   = avio_rl32(pb);
 568         length = avio_rl32(pb);
 569         if (!length)
 570             break;
 571         if (ff_guidcmp(&guid, metadata_guid)) {
 572             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
 573                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
 574             break;
 575         }
 576         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
 577         get_tag(s, pb, key, type, length);
 578     }
 579
 580     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 581 }
 582
 583 /**
 584  * parse VIDEOINFOHEADER2 structure
 585  * @return bytes consumed
 586  */
 587 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 588 {
 589     WtvContext *wtv = s->priv_data;
 590     AVIOContext *pb = wtv->pb;
 591
 592     avio_skip(pb, 72);  // picture aspect ratio is unreliable
 593     ff_get_bmp_header(pb, st);
 594
 595     return 72 + 40;
 596 }
 597
 598 /**
 599  * Parse MPEG1WAVEFORMATEX extradata structure
 600  */
 601 static void parse_mpeg1waveformatex(AVStream *st)
 602 {
 603     /* fwHeadLayer */
 604     switch (AV_RL16(st->codec->extradata)) {
 605     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
 606     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
 607     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
 608     }
 609
 610     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
 611
 612     /* dwHeadMode */
 613     switch (AV_RL16(st->codec->extradata + 6)) {
 614     case 1 :
 615     case 2 :
 616     case 4 : st->codec->channels       = 2;
 617              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
 618              break;
 619     case 8 : st->codec->channels       = 1;
 620              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
 621              break;
 622     }
 623 }
 624
 625 /**
 626  * Initialise stream
 627  * @param st Stream to initialise, or NULL to create and initialise new stream
 628  * @return NULL on error
 629  */
 630 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
 631 {
 632     if (st) {
 633         if (st->codec->extradata) {
 634             av_freep(&st->codec->extradata);
 635             st->codec->extradata_size = 0;
 636         }
 637     } else {
 638         WtvStream *wst = av_mallocz(sizeof(WtvStream));
 639         if (!wst)
 640             return NULL;
 641         st = avformat_new_stream(s, NULL);
 642         if (!st) {
 643             av_free(wst);
 644             return NULL;
 645         }
 646         st->id = sid;
 647         st->priv_data = wst;
 648     }
 649     st->codec->codec_type = codec_type;
 650     st->need_parsing      = AVSTREAM_PARSE_FULL;
 651     avpriv_set_pts_info(st, 64, 1, 10000000);
 652     return st;
 653 }
 654
 655 /**
 656  * parse Media Type structure and populate stream
 657  * @param st         Stream, or NULL to create new stream
 658  * @param mediatype  Mediatype GUID
 659  * @param subtype    Subtype GUID
 660  * @param formattype Format GUID
 661  * @param size       Size of format buffer
 662  * @return NULL on error
 663  */
 664 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
 665                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 666                                    ff_asf_guid formattype, int size)
 667 {
 668     WtvContext *wtv = s->priv_data;
 669     AVIOContext *pb = wtv->pb;
 670     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 671         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 672         ff_asf_guid actual_subtype;
 673         ff_asf_guid actual_formattype;
 674
 675         if (size < 32) {
 676             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 677             avio_skip(pb, size);
 678             return NULL;
 679         }
 680
 681         avio_skip(pb, size - 32);
 682         ff_get_guid(pb, &actual_subtype);
 683         ff_get_guid(pb, &actual_formattype);
 684         avio_seek(pb, -size, SEEK_CUR);
 685
 686         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 687         avio_skip(pb, 32);
 688         return st;
 689     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 690         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
 691         if (!st)
 692             return NULL;
 693         if (!ff_guidcmp(formattype, format_waveformatex)) {
 694             int ret = ff_get_wav_header(s, pb, st->codec, size);
 695             if (ret < 0)
 696                 return NULL;
 697         } else {
 698             if (ff_guidcmp(formattype, format_none))
 699                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 700             avio_skip(pb, size);
 701         }
 702
 703         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 704             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
 705         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 706             if (st->codec->extradata && st->codec->extradata_size >= 22)
 707                 parse_mpeg1waveformatex(st);
 708             else
 709                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 710         } else {
 711             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
 712             if (st->codec->codec_id == AV_CODEC_ID_NONE)
 713                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 714         }
 715         return st;
 716     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 717         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
 718         if (!st)
 719             return NULL;
 720         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 721             int consumed = parse_videoinfoheader2(s, st);
 722             avio_skip(pb, FFMAX(size - consumed, 0));
 723         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 724             int consumed = parse_videoinfoheader2(s, st);
 725             avio_skip(pb, FFMAX(size - consumed, 0));
 726         } else {
 727             if (ff_guidcmp(formattype, format_none))
 728                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 729             avio_skip(pb, size);
 730         }
 731
 732         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 733             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 734         } else {
 735             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 736         }
 737         if (st->codec->codec_id == AV_CODEC_ID_NONE)
 738             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 739         return st;
 740     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 741                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 742         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 743         if (!st)
 744             return NULL;
 745         if (ff_guidcmp(formattype, format_none))
 746             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 747         avio_skip(pb, size);
 748         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
 749         return st;
 750     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 751                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 752         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 753         if (!st)
 754             return NULL;
 755         if (ff_guidcmp(formattype, format_none))
 756             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 757         avio_skip(pb, size);
 758         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
 759         return st;
 760     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 761                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 762         if (ff_guidcmp(formattype, format_none))
 763             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 764         avio_skip(pb, size);
 765         return NULL;
 766     }
 767
 768     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
 769                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
 770                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
 771     avio_skip(pb, size);
 772     return NULL;
 773 }
 774
 775 enum {
 776     SEEK_TO_DATA = 0,
 777     SEEK_TO_PTS,
 778 };
 779
 780 /**
 781  * Parse WTV chunks
 782  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
 783  * @param seekts timestamp
 784  * @param[out] len_ptr Length of data chunk
 785  * @return stream index of data chunk, or <0 on error
 786  */
 787 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 788 {
 789     WtvContext *wtv = s->priv_data;
 790     AVIOContext *pb = wtv->pb;
 791     while (!pb->eof_reached) {
 792         ff_asf_guid g;
 793         int len, sid, consumed;
 794
 795         ff_get_guid(pb, &g);
 796         len = avio_rl32(pb);
 797         if (len < 32)
 798             break;
 799         sid = avio_rl32(pb) & 0x7FFF;
 800         avio_skip(pb, 8);
 801         consumed = 32;
 802
 803         if (!ff_guidcmp(g, stream_guid)) {
 804             if (ff_find_stream_index(s, sid) < 0) {
 805                 ff_asf_guid mediatype, subtype, formattype;
 806                 int size;
 807                 avio_skip(pb, 28);
 808                 ff_get_guid(pb, &mediatype);
 809                 ff_get_guid(pb, &subtype);
 810                 avio_skip(pb, 12);
 811                 ff_get_guid(pb, &formattype);
 812                 size = avio_rl32(pb);
 813                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
 814                 consumed += 92 + size;
 815             }
 816         } else if (!ff_guidcmp(g, stream2_guid)) {
 817             int stream_index = ff_find_stream_index(s, sid);
 818             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
 819                 ff_asf_guid mediatype, subtype, formattype;
 820                 int size;
 821                 avio_skip(pb, 12);
 822                 ff_get_guid(pb, &mediatype);
 823                 ff_get_guid(pb, &subtype);
 824                 avio_skip(pb, 12);
 825                 ff_get_guid(pb, &formattype);
 826                 size = avio_rl32(pb);
 827                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
 828                 consumed += 76 + size;
 829             }
 830         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 831                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 832                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 833                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 834                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 835                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 836             int stream_index = ff_find_stream_index(s, sid);
 837             if (stream_index >= 0) {
 838                 AVStream *st = s->streams[stream_index];
 839                 uint8_t buf[258];
 840                 const uint8_t *pbuf = buf;
 841                 int buf_size;
 842
 843                 avio_skip(pb, 8);
 844                 consumed += 8;
 845                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 846                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 847                     avio_skip(pb, 6);
 848                     consumed += 6;
 849                 }
 850
 851                 buf_size = FFMIN(len - consumed, sizeof(buf));
 852                 avio_read(pb, buf, buf_size);
 853                 consumed += buf_size;
 854                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
 855             }
 856         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
 857             int stream_index = ff_find_stream_index(s, sid);
 858             if (stream_index >= 0) {
 859                 AVStream *st = s->streams[stream_index];
 860                 int audio_type;
 861                 avio_skip(pb, 8);
 862                 audio_type = avio_r8(pb);
 863                 if (audio_type == 2)
 864                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
 865                 else if (audio_type == 3)
 866                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 867                 consumed += 9;
 868             }
 869         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 870             int stream_index = ff_find_stream_index(s, sid);
 871             if (stream_index >= 0) {
 872                 avio_skip(pb, 12);
 873                 if (avio_rl32(pb))
 874                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 875                 consumed += 16;
 876             }
 877         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 878             int stream_index = ff_find_stream_index(s, sid);
 879             if (stream_index >= 0) {
 880                 AVStream *st = s->streams[stream_index];
 881                 uint8_t language[4];
 882                 avio_skip(pb, 12);
 883                 avio_read(pb, language, 3);
 884                 if (language[0]) {
 885                     language[3] = 0;
 886                     av_dict_set(&st->metadata, "language", language, 0);
 887                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
 888                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 889                 }
 890                 consumed += 15;
 891             }
 892         } else if (!ff_guidcmp(g, timestamp_guid)) {
 893             int stream_index = ff_find_stream_index(s, sid);
 894             if (stream_index >= 0) {
 895                 avio_skip(pb, 8);
 896                 wtv->pts = avio_rl64(pb);
 897                 consumed += 16;
 898                 if (wtv->pts == -1)
 899                     wtv->pts = AV_NOPTS_VALUE;
 900                 else {
 901                     wtv->last_valid_pts = wtv->pts;
 902                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
 903                         wtv->epoch = wtv->pts;
 904                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 905 #define WTV_PAD8(x) (((x) + 7) & ~7)
 906                     avio_skip(pb, WTV_PAD8(len) - consumed);
 907                     return 0;
 908                 }
 909                 }
 910             }
 911         } else if (!ff_guidcmp(g, data_guid)) {
 912             int stream_index = ff_find_stream_index(s, sid);
 913             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
 914                 WtvStream *wst = s->streams[stream_index]->priv_data;
 915                 wst->seen_data = 1;
 916                 if (len_ptr) {
 917                     *len_ptr = len;
 918                 }
 919                 return stream_index;
 920             }
 921         } else if (
 922             !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}) ||
 923             !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}) ||
 924             !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}) ||
 925             !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}) ||
 926             !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}) ||
 927             !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}) ||
 928             !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}) ||
 929             !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}) ||
 930             !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}) ||
 931             !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}) ||
 932             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 933             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 934             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 935             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 936             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 937             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 938             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 939             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 940             //ignore known guids
 941         } else
 942             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
 943
 944         avio_skip(pb, WTV_PAD8(len) - consumed);
 945     }
 946     return AVERROR_EOF;
 947 }
 948
 949 /* declare utf16le strings */
 950 #define _ , 0,
 951 static const uint8_t timeline_le16[] =
 952     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
 953 static const uint8_t table_0_entries_legacy_attrib_le16[] =
 954     {'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};
 955 static const uint8_t table_0_entries_time_le16[] =
 956     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
 957 static const uint8_t timeline_table_0_entries_Events_le16[] =
 958     {'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};
 959 #undef _
 960
 961 static int read_header(AVFormatContext *s)
 962 {
 963     WtvContext *wtv = s->priv_data;
 964     int root_sector, root_size;
 965     uint8_t root[WTV_SECTOR_SIZE];
 966     AVIOContext *pb;
 967     int64_t timeline_pos;
 968     int ret;
 969
 970     wtv->epoch          =
 971     wtv->pts            =
 972     wtv->last_valid_pts = AV_NOPTS_VALUE;
 973
 974     /* read root directory sector */
 975     avio_skip(s->pb, 0x30);
 976     root_size = avio_rl32(s->pb);
 977     if (root_size > sizeof(root)) {
 978         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
 979         return AVERROR_INVALIDDATA;
 980     }
 981     avio_skip(s->pb, 4);
 982     root_sector = avio_rl32(s->pb);
 983
 984     ret = seek_by_sector(s->pb, root_sector, 0);
 985     if (ret < 0)
 986         return ret;
 987     root_size = avio_read(s->pb, root, root_size);
 988     if (root_size < 0)
 989         return AVERROR_INVALIDDATA;
 990
 991     /* parse chunks up until first data chunk */
 992     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
 993     if (!wtv->pb) {
 994         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
 995         return AVERROR_INVALIDDATA;
 996     }
 997
 998     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 999     if (ret < 0)
1000         return ret;
1001     avio_seek(wtv->pb, -32, SEEK_CUR);
1002
1003     timeline_pos = avio_tell(s->pb); // save before opening another file
1004
1005     /* read metadata */
1006     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
1007     if (pb) {
1008         parse_legacy_attrib(s, pb);
1009         wtvfile_close(pb);
1010     }
1011
1012     /* read seek index */
1013     if (s->nb_streams) {
1014         AVStream *st = s->streams[0];
1015         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1016         if (pb) {
1017             while(1) {
1018                 uint64_t timestamp = avio_rl64(pb);
1019                 uint64_t frame_nb  = avio_rl64(pb);
1020                 if (pb->eof_reached)
1021                     break;
1022                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1023                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1024             }
1025             wtvfile_close(pb);
1026
1027             if (wtv->nb_index_entries) {
1028                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1029                 if (pb) {
1030                     int i;
1031                     while (1) {
1032                         uint64_t frame_nb = avio_rl64(pb);
1033                         uint64_t position = avio_rl64(pb);
1034                         if (pb->eof_reached)
1035                             break;
1036                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1037                             AVIndexEntry *e = wtv->index_entries + i;
1038                             if (frame_nb > e->size)
1039                                 break;
1040                             if (position > e->pos)
1041                                 e->pos = position;
1042                         }
1043                     }
1044                     wtvfile_close(pb);
1045                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1046                 }
1047             }
1048         }
1049     }
1050
1051     avio_seek(s->pb, timeline_pos, SEEK_SET);
1052     return 0;
1053 }
1054
1055 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1056 {
1057     WtvContext *wtv = s->priv_data;
1058     AVIOContext *pb = wtv->pb;
1059     int stream_index, len, ret;
1060
1061     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1062     if (stream_index < 0)
1063         return stream_index;
1064
1065     ret = av_get_packet(pb, pkt, len - 32);
1066     if (ret < 0)
1067         return ret;
1068     pkt->stream_index = stream_index;
1069     pkt->pts          = wtv->pts;
1070     avio_skip(pb, WTV_PAD8(len) - len);
1071     return 0;
1072 }
1073
1074 static int read_seek(AVFormatContext *s, int stream_index,
1075                      int64_t ts, int flags)
1076 {
1077     WtvContext *wtv = s->priv_data;
1078     AVIOContext *pb = wtv->pb;
1079     AVStream *st = s->streams[0];
1080     int64_t ts_relative;
1081     int i;
1082
1083     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1084         return AVERROR(ENOSYS);
1085
1086     /* timestamp adjustment is required because wtv->pts values are absolute,
1087      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1088     ts_relative = ts;
1089     if (wtv->epoch != AV_NOPTS_VALUE)
1090         ts_relative -= wtv->epoch;
1091
1092     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1093     if (i < 0) {
1094         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1095             avio_seek(pb, 0, SEEK_SET);
1096         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1097             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1098         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1099             return AVERROR(ERANGE);
1100         return 0;
1101     }
1102     wtv->pts = wtv->index_entries[i].timestamp;
1103     if (wtv->epoch != AV_NOPTS_VALUE)
1104         wtv->pts += wtv->epoch;
1105     wtv->last_valid_pts = wtv->pts;
1106     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1107     return 0;
1108 }
1109
1110 static int read_close(AVFormatContext *s)
1111 {
1112     WtvContext *wtv = s->priv_data;
1113     av_free(wtv->index_entries);
1114     wtvfile_close(wtv->pb);
1115     return 0;
1116 }
1117
1118 AVInputFormat ff_wtv_demuxer = {
1119     .name           = "wtv",
1120     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1121     .priv_data_size = sizeof(WtvContext),
1122     .read_probe     = read_probe,
1123     .read_header    = read_header,
1124     .read_packet    = read_packet,
1125     .read_seek      = read_seek,
1126     .read_close     = read_close,
1127     .flags          = AVFMT_SHOW_IDS,
1128 };