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   1 /*
   2  * Windows Television (WTV) demuxer
   3  * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Windows Television (WTV) demuxer
  25  * @author Peter Ross <pross@xvid.org>
  26  */
  27
  28 #include "libavutil/intreadwrite.h"
  29 #include "libavutil/intfloat_readwrite.h"
  30 #include "libavutil/dict.h"
  31 #include "avformat.h"
  32 #include "internal.h"
  33 #include "riff.h"
  34 #include "asf.h"
  35 #include "mpegts.h"
  36 #include <strings.h>
  37
  38 /* Macros for formating GUIDs */
  39 #define PRI_GUID \
  40     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
  41 #define ARG_GUID(g) \
  42     g[0],g[1],g[2],g[3],g[4],g[5],g[6],g[7],g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
  43
  44 #define PRI_PRETTY_GUID \
  45     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
  46 #define ARG_PRETTY_GUID(g) \
  47     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]
  48 #define LEN_PRETTY_GUID 34
  49
  50 /*
  51  *
  52  * File system routines
  53  *
  54  */
  55
  56 #define WTV_SECTOR_BITS    12
  57 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
  58 #define WTV_BIGSECTOR_BITS 18
  59
  60 typedef struct {
  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 /**
  73  * @return bytes read, 0 on end of file, or <0 on error
  74  */
  75 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
  76 {
  77     WtvFile *wf = opaque;
  78     AVIOContext *pb = wf->pb_filesystem;
  79     int nread = 0;
  80
  81     if (wf->error || pb->error)
  82         return -1;
  83     if (wf->position >= wf->length || pb->eof_reached)
  84         return 0;
  85
  86     buf_size = FFMIN(buf_size, wf->length - wf->position);
  87     while(nread < buf_size) {
  88         int n;
  89         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
  90         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
  91
  92         n = avio_read(pb, buf, read_request);
  93         if (n <= 0)
  94             break;
  95         nread += n;
  96         buf += n;
  97         wf->position += n;
  98         if (n == remaining_in_sector) {
  99             int i = wf->position >> wf->sector_bits;
 100             if (i >= wf->nb_sectors ||
 101                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
 102                 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
 103                 wf->error = 1;
 104                 break;
 105             }
 106         }
 107     }
 108     return nread;
 109 }
 110
 111 /**
 112  * @return position (or file length)
 113  */
 114 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
 115 {
 116     WtvFile *wf = opaque;
 117     AVIOContext *pb = wf->pb_filesystem;
 118
 119     if (whence == AVSEEK_SIZE)
 120         return wf->length;
 121     else if (whence == SEEK_CUR)
 122         offset = wf->position + offset;
 123     else if (whence == SEEK_END)
 124         offset = wf->length;
 125
 126     wf->error = offset < 0 || offset >= wf->length ||
 127                 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
 128                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
 129     wf->position = offset;
 130     return offset;
 131 }
 132
 133 /**
 134  * read non-zero integers (le32) from input stream
 135  * @param pb
 136  * @param[out] data destination
 137  * @param     count maximum number of integers to read
 138  * @return    total number of integers read
 139  */
 140 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
 141 {
 142     int i, total = 0;
 143     for (i = 0; i < count; i++) {
 144         if ((data[total] = avio_rl32(pb)))
 145            total++;
 146     }
 147     return total;
 148 }
 149
 150 /**
 151  * Open file
 152  * @param first_sector  First sector
 153  * @param length        Length of file (bytes)
 154  * @param depth         File allocation table depth
 155  * @return NULL on error
 156  */
 157 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
 158 {
 159     AVIOContext *pb;
 160     WtvFile *wf;
 161     uint8_t *buffer;
 162
 163     if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
 164         return NULL;
 165
 166     wf = av_mallocz(sizeof(WtvFile));
 167     if (!wf)
 168         return NULL;
 169
 170     if (depth == 0) {
 171         wf->sectors = av_malloc(sizeof(uint32_t));
 172         if (!wf->sectors) {
 173             av_free(wf);
 174             return NULL;
 175         }
 176         wf->sectors[0]  = first_sector;
 177         wf->nb_sectors  = 1;
 178         wf->sector_bits = WTV_SECTOR_BITS;
 179     } else if (depth == 1) {
 180         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
 181         if (!wf->sectors) {
 182             av_free(wf);
 183             return NULL;
 184         }
 185         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
 186         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 187     } else if (depth == 2) {
 188         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
 189         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
 190         int i;
 191
 192         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
 193         if (!wf->sectors) {
 194             av_free(wf);
 195             return NULL;
 196         }
 197         wf->nb_sectors = 0;
 198         for (i = 0; i < nb_sectors1; i++) {
 199             if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
 200                 break;
 201             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
 202         }
 203         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 204     } else {
 205         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 206         av_free(wf);
 207         return NULL;
 208     }
 209
 210     if (!wf->nb_sectors) {
 211         av_free(wf->sectors);
 212         av_free(wf);
 213         return NULL;
 214     }
 215
 216     /* check length */
 217     length &= 0xFFFFFFFFFFFF;
 218     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
 219         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);
 220         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
 221     }
 222     wf->length = length;
 223
 224     /* seek to intial sector */
 225     wf->position = 0;
 226     if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
 227         av_free(wf->sectors);
 228         av_free(wf);
 229         return NULL;
 230     }
 231
 232     wf->pb_filesystem = s->pb;
 233     buffer = av_malloc(1 << wf->sector_bits);
 234     if (!buffer) {
 235         av_free(wf->sectors);
 236         av_free(wf);
 237         return NULL;
 238     }
 239
 240     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
 241                            wtvfile_read_packet, NULL, wtvfile_seek);
 242     if (!pb) {
 243         av_free(buffer);
 244         av_free(wf->sectors);
 245         av_free(wf);
 246     }
 247     return pb;
 248 }
 249
 250 static const ff_asf_guid dir_entry_guid =
 251     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
 252
 253 /**
 254  * Open file using filename
 255  * @param[in]  buf       directory buffer
 256  * @param      buf_size  directory buffer size
 257  * @param[in]  filename
 258  * @param      filename_size size of filename
 259  * @return NULL on error
 260  */
 261 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
 262 {
 263     const uint8_t *buf_end = buf + buf_size;
 264
 265     while(buf + 48 <= buf_end) {
 266         int dir_length, name_size, first_sector, depth;
 267         uint64_t file_length;
 268         const uint8_t *name;
 269         if (ff_guidcmp(buf, dir_entry_guid)) {
 270             av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
 271                    "remaining directory entries ignored\n", ARG_GUID(buf));
 272             break;
 273         }
 274         dir_length  = AV_RL16(buf + 16);
 275         file_length = AV_RL64(buf + 24);
 276         name_size   = 2 * AV_RL32(buf + 32);
 277         if (buf + 48 + name_size > buf_end) {
 278             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
 279             break;
 280         }
 281         first_sector = AV_RL32(buf + 40 + name_size);
 282         depth        = AV_RL32(buf + 44 + name_size);
 283
 284         /* compare file name; test optional null terminator */
 285         name = buf + 40;
 286         if (name_size >= filename_size &&
 287             !memcmp(name, filename, filename_size) &&
 288             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
 289             return wtvfile_open_sector(first_sector, file_length, depth, s);
 290
 291         buf += dir_length;
 292     }
 293     return 0;
 294 }
 295
 296 #define wtvfile_open(s, buf, buf_size, filename) \
 297     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
 298
 299 /**
 300  * Close file opened with wtvfile_open_sector(), or wtv_open()
 301  */
 302 static void wtvfile_close(AVIOContext *pb)
 303 {
 304     WtvFile *wf = pb->opaque;
 305     av_free(wf->sectors);
 306     av_free(pb);
 307 }
 308
 309 /*
 310  *
 311  * Main demuxer
 312  *
 313  */
 314
 315 typedef struct {
 316     int seen_data;
 317 } WtvStream;
 318
 319 typedef struct {
 320     AVIOContext *pb;       /** timeline file */
 321     int64_t epoch;
 322     int64_t pts;             /** pts for next data chunk */
 323     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
 324
 325     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
 326        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
 327     AVIndexEntry *index_entries;
 328     int nb_index_entries;
 329     unsigned int index_entries_allocated_size;
 330 } WtvContext;
 331
 332 typedef struct {
 333     enum CodecID id;
 334     ff_asf_guid guid;
 335 } AVCodecGuid;
 336
 337 static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
 338 {
 339     int i;
 340     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
 341         if (!ff_guidcmp(guids[i].guid, guid))
 342             return guids[i].id;
 343     }
 344     return CODEC_ID_NONE;
 345 }
 346
 347 /* WTV GUIDs */
 348 static const ff_asf_guid wtv_guid =
 349     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 350 static const ff_asf_guid metadata_guid =
 351     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
 352 static const ff_asf_guid timestamp_guid =
 353     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
 354 static const ff_asf_guid data_guid =
 355     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 356 static const ff_asf_guid stream_guid =
 357     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
 358 static const ff_asf_guid stream2_guid =
 359     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 360 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
 361     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
 362 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
 363     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
 364 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
 365     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
 366 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
 367     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
 368 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
 369     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
 370 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
 371     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
 372 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
 373     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
 374 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
 375     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
 376 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
 377     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
 378
 379 /* Windows media GUIDs */
 380
 381 #define MEDIASUBTYPE_BASE_GUID \
 382     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
 383
 384 /* Media types */
 385 static const ff_asf_guid mediatype_audio =
 386     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
 387 static const ff_asf_guid mediatype_video =
 388     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
 389 static const ff_asf_guid mediasubtype_mpeg1payload =
 390     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 391 static const ff_asf_guid mediatype_mpeg2_sections =
 392     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 393 static const ff_asf_guid mediatype_mpeg2_pes =
 394     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 395 static const ff_asf_guid mediatype_mstvcaption =
 396     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 397
 398 /* Media subtypes */
 399 static const ff_asf_guid mediasubtype_cpfilters_processed =
 400     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 401 static const ff_asf_guid mediasubtype_dvb_subtitle =
 402     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 403 static const ff_asf_guid mediasubtype_teletext =
 404     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 405 static const ff_asf_guid mediasubtype_dtvccdata =
 406     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 407 static const ff_asf_guid mediasubtype_mpeg2_sections =
 408     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 409
 410 /* Formats */
 411 static const ff_asf_guid format_cpfilters_processed =
 412     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 413 static const ff_asf_guid format_waveformatex =
 414     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 415 static const ff_asf_guid format_videoinfo2 =
 416     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 417 static const ff_asf_guid format_mpeg2_video =
 418     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 419 static const ff_asf_guid format_none =
 420     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 421
 422 static const AVCodecGuid video_guids[] = {
 423     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 424     {CODEC_ID_NONE}
 425 };
 426
 427 static const AVCodecGuid audio_guids[] = {
 428     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 429     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
 430     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 431     {CODEC_ID_NONE}
 432 };
 433
 434 static int read_probe(AVProbeData *p)
 435 {
 436     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 437 }
 438
 439 /**
 440  * Convert win32 FILETIME to ISO-8601 string
 441  */
 442 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
 443 {
 444     time_t t = (value / 10000000LL) - 11644473600LL;
 445     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 446 }
 447
 448 /**
 449  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
 450  */
 451 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
 452 {
 453     time_t t = (value / 10000000LL) - 719162LL*86400LL;
 454     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 455 }
 456
 457 /**
 458  * Convert OLE DATE to ISO-8601 string
 459  */
 460 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
 461 {
 462     time_t t = 631112400LL + 86400*av_int2dbl(value);
 463     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 464 }
 465
 466 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
 467 {
 468     char mime[1024];
 469     char description[1024];
 470     unsigned int filesize;
 471     AVStream *st;
 472     int64_t pos = avio_tell(pb);
 473
 474     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
 475     if (strcmp(mime, "image/jpeg"))
 476         goto done;
 477
 478     avio_r8(pb);
 479     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
 480     filesize = avio_rl32(pb);
 481     if (!filesize)
 482         goto done;
 483
 484     st = avformat_new_stream(s, NULL);
 485     if (!st)
 486         goto done;
 487     av_dict_set(&st->metadata, "title", description, 0);
 488     st->codec->codec_id   = CODEC_ID_MJPEG;
 489     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
 490     st->codec->extradata  = av_mallocz(filesize);
 491     if (!st->codec->extradata)
 492         goto done;
 493     st->codec->extradata_size = filesize;
 494     avio_read(pb, st->codec->extradata, filesize);
 495 done:
 496     avio_seek(pb, pos + length, SEEK_SET);
 497 }
 498
 499 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
 500 {
 501     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
 502     char *buf = av_malloc(buf_size);
 503     if (!buf)
 504         return;
 505
 506     if (type == 0 && length == 4) {
 507         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
 508     } else if (type == 1) {
 509         avio_get_str16le(pb, length, buf, buf_size);
 510         if (!strlen(buf)) {
 511            av_free(buf);
 512            return;
 513         }
 514     } else if (type == 3 && length == 4) {
 515         strcpy(buf, avio_rl32(pb) ? "true" : "false");
 516     } else if (type == 4 && length == 8) {
 517         int64_t num = avio_rl64(pb);
 518         if (!strcmp(key, "WM/EncodingTime") ||
 519             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
 520             filetime_to_iso8601(buf, buf_size, num);
 521         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
 522                  !strcmp(key, "WM/WMRVEndTime"))
 523             crazytime_to_iso8601(buf, buf_size, num);
 524         else if (!strcmp(key, "WM/WMRVExpirationDate"))
 525             oledate_to_iso8601(buf, buf_size, num);
 526         else if (!strcmp(key, "WM/WMRVBitrate"))
 527             snprintf(buf, buf_size, "%f", av_int2dbl(num));
 528         else
 529             snprintf(buf, buf_size, "%"PRIi64, num);
 530     } else if (type == 5 && length == 2) {
 531         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
 532     } else if (type == 6 && length == 16) {
 533         ff_asf_guid guid;
 534         avio_read(pb, guid, 16);
 535         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
 536     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
 537         get_attachment(s, pb, length);
 538         av_freep(&buf);
 539         return;
 540     } else {
 541         av_freep(&buf);
 542         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
 543         avio_skip(pb, length);
 544         return;
 545     }
 546
 547     av_dict_set(&s->metadata, key, buf, 0);
 548     av_freep(&buf);
 549 }
 550
 551 /**
 552  * Parse metadata entries
 553  */
 554 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
 555 {
 556     ff_asf_guid guid;
 557     int length, type;
 558     while(!pb->eof_reached) {
 559         char key[1024];
 560         ff_get_guid(pb, &guid);
 561         type   = avio_rl32(pb);
 562         length = avio_rl32(pb);
 563         if (!length)
 564             break;
 565         if (ff_guidcmp(&guid, metadata_guid)) {
 566             av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
 567                    "remaining metadata entries ignored\n", ARG_GUID(guid));
 568             break;
 569         }
 570         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
 571         get_tag(s, pb, key, type, length);
 572     }
 573
 574     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 575 }
 576
 577 /**
 578  * parse VIDEOINFOHEADER2 structure
 579  * @return bytes consumed
 580  */
 581 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 582 {
 583     WtvContext *wtv = s->priv_data;
 584     AVIOContext *pb = wtv->pb;
 585
 586     avio_skip(pb, 72);  // picture aspect ratio is unreliable
 587     ff_get_bmp_header(pb, st);
 588
 589     return 72 + 40;
 590 }
 591
 592 /**
 593  * Parse MPEG1WAVEFORMATEX extradata structure
 594  */
 595 static void parse_mpeg1waveformatex(AVStream *st)
 596 {
 597     /* fwHeadLayer */
 598     switch (AV_RL16(st->codec->extradata)) {
 599     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
 600     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
 601     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
 602     }
 603
 604     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
 605
 606     /* dwHeadMode */
 607     switch (AV_RL16(st->codec->extradata + 6)) {
 608     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
 609     case 8 :                   st->codec->channels = 1; break;
 610     }
 611 }
 612
 613 /**
 614  * Initialise stream
 615  * @param st Stream to initialise, or NULL to create and initialise new stream
 616  * @return NULL on error
 617  */
 618 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
 619 {
 620     if (st) {
 621         if (st->codec->extradata) {
 622             av_freep(&st->codec->extradata);
 623             st->codec->extradata_size = 0;
 624         }
 625     } else {
 626         WtvStream *wst = av_mallocz(sizeof(WtvStream));
 627         if (!wst)
 628             return NULL;
 629         st = avformat_new_stream(s, NULL);
 630         if (!st)
 631             return NULL;
 632         st->id = sid;
 633         st->priv_data = wst;
 634     }
 635     st->codec->codec_type = codec_type;
 636     st->need_parsing      = AVSTREAM_PARSE_FULL;
 637     av_set_pts_info(st, 64, 1, 10000000);
 638     return st;
 639 }
 640
 641 /**
 642  * parse Media Type structure and populate stream
 643  * @param st         Stream, or NULL to create new stream
 644  * @param mediatype  Mediatype GUID
 645  * @param subtype    Subtype GUID
 646  * @param formattype Format GUID
 647  * @param size       Size of format buffer
 648  * @return NULL on error
 649  */
 650 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
 651                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 652                                    ff_asf_guid formattype, int size)
 653 {
 654     WtvContext *wtv = s->priv_data;
 655     AVIOContext *pb = wtv->pb;
 656     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 657         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 658         ff_asf_guid actual_subtype;
 659         ff_asf_guid actual_formattype;
 660
 661         if (size < 32) {
 662             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 663             avio_skip(pb, size);
 664             return NULL;
 665         }
 666
 667         avio_skip(pb, size - 32);
 668         ff_get_guid(pb, &actual_subtype);
 669         ff_get_guid(pb, &actual_formattype);
 670         avio_seek(pb, -size, SEEK_CUR);
 671
 672         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 673         avio_skip(pb, 32);
 674         return st;
 675     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 676         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
 677         if (!st)
 678             return NULL;
 679         if (!ff_guidcmp(formattype, format_waveformatex)) {
 680             int ret = ff_get_wav_header(pb, st->codec, size);
 681             if (ret < 0)
 682                 return NULL;
 683         } else {
 684             if (ff_guidcmp(formattype, format_none))
 685                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 686             avio_skip(pb, size);
 687         }
 688
 689         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
 690             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
 691         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 692             if (st->codec->extradata && st->codec->extradata_size >= 22)
 693                 parse_mpeg1waveformatex(st);
 694             else
 695                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 696         } else {
 697             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
 698             if (st->codec->codec_id == CODEC_ID_NONE)
 699                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
 700         }
 701         return st;
 702     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 703         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
 704         if (!st)
 705             return NULL;
 706         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 707             int consumed = parse_videoinfoheader2(s, st);
 708             avio_skip(pb, FFMAX(size - consumed, 0));
 709         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 710             int consumed = parse_videoinfoheader2(s, st);
 711             avio_skip(pb, FFMAX(size - consumed, 0));
 712         } else {
 713             if (ff_guidcmp(formattype, format_none))
 714                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 715             avio_skip(pb, size);
 716         }
 717
 718         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
 719             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 720         } else {
 721             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 722         }
 723         if (st->codec->codec_id == CODEC_ID_NONE)
 724             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
 725         return st;
 726     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 727                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 728         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 729         if (!st)
 730             return NULL;
 731         if (ff_guidcmp(formattype, format_none))
 732             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 733         avio_skip(pb, size);
 734         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
 735         return st;
 736     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 737                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 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:"PRI_GUID"\n", ARG_GUID(formattype));
 743         avio_skip(pb, size);
 744         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
 745         return st;
 746     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 747                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 748         if (ff_guidcmp(formattype, format_none))
 749             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 750         avio_skip(pb, size);
 751         return NULL;
 752     }
 753
 754     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
 755                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
 756                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
 757     avio_skip(pb, size);
 758     return NULL;
 759 }
 760
 761 enum {
 762     SEEK_TO_DATA = 0,
 763     SEEK_TO_PTS,
 764 };
 765
 766 /**
 767  * Parse WTV chunks
 768  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
 769  * @param seekts timestamp
 770  * @param[out] len_ptr Length of data chunk
 771  * @return stream index of data chunk, or <0 on error
 772  */
 773 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 774 {
 775     WtvContext *wtv = s->priv_data;
 776     AVIOContext *pb = wtv->pb;
 777     while (!pb->eof_reached) {
 778         ff_asf_guid g;
 779         int len, sid, consumed;
 780
 781         ff_get_guid(pb, &g);
 782         len = avio_rl32(pb);
 783         if (len < 32)
 784             break;
 785         sid = avio_rl32(pb) & 0x7FFF;
 786         avio_skip(pb, 8);
 787         consumed = 32;
 788
 789         if (!ff_guidcmp(g, stream_guid)) {
 790             if (ff_find_stream_index(s, sid) < 0) {
 791                 ff_asf_guid mediatype, subtype, formattype;
 792                 int size;
 793                 avio_skip(pb, 28);
 794                 ff_get_guid(pb, &mediatype);
 795                 ff_get_guid(pb, &subtype);
 796                 avio_skip(pb, 12);
 797                 ff_get_guid(pb, &formattype);
 798                 size = avio_rl32(pb);
 799                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
 800                 consumed += 92 + size;
 801             }
 802         } else if (!ff_guidcmp(g, stream2_guid)) {
 803             int stream_index = ff_find_stream_index(s, sid);
 804             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
 805                 ff_asf_guid mediatype, subtype, formattype;
 806                 int size;
 807                 avio_skip(pb, 12);
 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, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
 814                 consumed += 76 + size;
 815             }
 816         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 817                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 818                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 819                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 820                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 821                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 822             int stream_index = ff_find_stream_index(s, sid);
 823             if (stream_index >= 0) {
 824                 AVStream *st = s->streams[stream_index];
 825                 uint8_t buf[258];
 826                 const uint8_t *pbuf = buf;
 827                 int buf_size;
 828
 829                 avio_skip(pb, 8);
 830                 consumed += 8;
 831                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 832                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 833                     avio_skip(pb, 6);
 834                     consumed += 6;
 835                 }
 836
 837                 buf_size = FFMIN(len - consumed, sizeof(buf));
 838                 avio_read(pb, buf, buf_size);
 839                 consumed += buf_size;
 840                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
 841             }
 842         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
 843             int stream_index = ff_find_stream_index(s, sid);
 844             if (stream_index >= 0) {
 845                 AVStream *st = s->streams[stream_index];
 846                 int audio_type;
 847                 avio_skip(pb, 8);
 848                 audio_type = avio_r8(pb);
 849                 if (audio_type == 2)
 850                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
 851                 else if (audio_type == 3)
 852                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 853                 consumed += 9;
 854             }
 855         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 856             int stream_index = ff_find_stream_index(s, sid);
 857             if (stream_index >= 0) {
 858                 avio_skip(pb, 12);
 859                 if (avio_rl32(pb))
 860                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 861                 consumed += 16;
 862             }
 863         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 864             int stream_index = ff_find_stream_index(s, sid);
 865             if (stream_index >= 0) {
 866                 AVStream *st = s->streams[stream_index];
 867                 uint8_t language[4];
 868                 avio_skip(pb, 12);
 869                 avio_read(pb, language, 3);
 870                 if (language[0]) {
 871                     language[3] = 0;
 872                     av_dict_set(&st->metadata, "language", language, 0);
 873                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
 874                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 875                 }
 876                 consumed += 15;
 877             }
 878         } else if (!ff_guidcmp(g, timestamp_guid)) {
 879             int stream_index = ff_find_stream_index(s, sid);
 880             if (stream_index >= 0) {
 881                 avio_skip(pb, 8);
 882                 wtv->pts = avio_rl64(pb);
 883                 consumed += 16;
 884                 if (wtv->pts == -1)
 885                     wtv->pts = AV_NOPTS_VALUE;
 886                 else {
 887                     wtv->last_valid_pts = wtv->pts;
 888                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
 889                         wtv->epoch = wtv->pts;
 890                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 891 #define WTV_PAD8(x) (((x) + 7) & ~7)
 892                     avio_skip(pb, WTV_PAD8(len) - consumed);
 893                     return 0;
 894                 }
 895                 }
 896             }
 897         } else if (!ff_guidcmp(g, data_guid)) {
 898             int stream_index = ff_find_stream_index(s, sid);
 899             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
 900                 WtvStream *wst = s->streams[stream_index]->priv_data;
 901                 wst->seen_data = 1;
 902                 if (len_ptr) {
 903                     *len_ptr = len;
 904                 }
 905                 return stream_index;
 906             }
 907         } else if (
 908             !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}) ||
 909             !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}) ||
 910             !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}) ||
 911             !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}) ||
 912             !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}) ||
 913             !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}) ||
 914             !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}) ||
 915             !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}) ||
 916             !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}) ||
 917             !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}) ||
 918             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 919             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 920             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 921             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 922             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 923             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 924             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 925             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 926             //ignore known guids
 927         } else
 928             av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
 929
 930         avio_skip(pb, WTV_PAD8(len) - consumed);
 931     }
 932     return AVERROR_EOF;
 933 }
 934
 935 /* declare utf16le strings */
 936 #define _ , 0,
 937 static const uint8_t timeline_le16[] =
 938     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
 939 static const uint8_t table_0_entries_legacy_attrib_le16[] =
 940     {'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};
 941 static const uint8_t table_0_entries_time_le16[] =
 942     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
 943 static const uint8_t timeline_table_0_entries_Events_le16[] =
 944     {'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};
 945 #undef _
 946
 947 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
 948 {
 949     WtvContext *wtv = s->priv_data;
 950     int root_sector, root_size;
 951     uint8_t root[WTV_SECTOR_SIZE];
 952     AVIOContext *pb;
 953     int64_t timeline_pos;
 954     int ret;
 955
 956     wtv->epoch          =
 957     wtv->pts            =
 958     wtv->last_valid_pts = AV_NOPTS_VALUE;
 959
 960     /* read root directory sector */
 961     avio_skip(s->pb, 0x30);
 962     root_size = avio_rl32(s->pb);
 963     if (root_size > sizeof(root)) {
 964         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
 965         return AVERROR_INVALIDDATA;
 966     }
 967     avio_skip(s->pb, 4);
 968     root_sector = avio_rl32(s->pb);
 969
 970     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
 971     root_size = avio_read(s->pb, root, root_size);
 972     if (root_size < 0)
 973         return AVERROR_INVALIDDATA;
 974
 975     /* parse chunks up until first data chunk */
 976     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
 977     if (!wtv->pb) {
 978         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
 979         return AVERROR_INVALIDDATA;
 980     }
 981
 982     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 983     if (ret < 0)
 984         return ret;
 985     avio_seek(wtv->pb, -32, SEEK_CUR);
 986
 987     timeline_pos = avio_tell(s->pb); // save before opening another file
 988
 989     /* read metadata */
 990     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
 991     if (pb) {
 992         parse_legacy_attrib(s, pb);
 993         wtvfile_close(pb);
 994     }
 995
 996     /* read seek index */
 997     if (s->nb_streams) {
 998         AVStream *st = s->streams[0];
 999         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1000         if (pb) {
1001             while(1) {
1002                 uint64_t timestamp = avio_rl64(pb);
1003                 uint64_t frame_nb  = avio_rl64(pb);
1004                 if (pb->eof_reached)
1005                     break;
1006                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1007                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1008             }
1009             wtvfile_close(pb);
1010
1011             if (wtv->nb_index_entries) {
1012                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1013                 if (pb) {
1014                     int i;
1015                     while (1) {
1016                         uint64_t frame_nb = avio_rl64(pb);
1017                         uint64_t position = avio_rl64(pb);
1018                         if (pb->eof_reached)
1019                             break;
1020                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1021                             AVIndexEntry *e = wtv->index_entries + i;
1022                             if (frame_nb > e->size)
1023                                 break;
1024                             if (position > e->pos)
1025                                 e->pos = position;
1026                         }
1027                     }
1028                     wtvfile_close(pb);
1029                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1030                 }
1031             }
1032         }
1033     }
1034
1035     avio_seek(s->pb, timeline_pos, SEEK_SET);
1036     return 0;
1037 }
1038
1039 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1040 {
1041     WtvContext *wtv = s->priv_data;
1042     AVIOContext *pb = wtv->pb;
1043     int stream_index, len, ret;
1044
1045     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1046     if (stream_index < 0)
1047         return stream_index;
1048
1049     ret = av_get_packet(pb, pkt, len - 32);
1050     if (ret < 0)
1051         return ret;
1052     pkt->stream_index = stream_index;
1053     pkt->pts          = wtv->pts;
1054     avio_skip(pb, WTV_PAD8(len) - len);
1055     return 0;
1056 }
1057
1058 static int read_seek(AVFormatContext *s, int stream_index,
1059                      int64_t ts, int flags)
1060 {
1061     WtvContext *wtv = s->priv_data;
1062     AVIOContext *pb = wtv->pb;
1063     AVStream *st = s->streams[0];
1064     int64_t ts_relative;
1065     int i;
1066
1067     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1068         return AVERROR(ENOSYS);
1069
1070     /* timestamp adjustment is required because wtv->pts values are absolute,
1071      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1072     ts_relative = ts;
1073     if (wtv->epoch != AV_NOPTS_VALUE)
1074         ts_relative -= wtv->epoch;
1075
1076     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1077     if (i < 0) {
1078         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1079             avio_seek(pb, 0, SEEK_SET);
1080         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1081             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1082         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1083             return AVERROR(ERANGE);
1084         return 0;
1085     }
1086     wtv->pts = wtv->index_entries[i].timestamp;
1087     if (wtv->epoch != AV_NOPTS_VALUE)
1088         wtv->pts += wtv->epoch;
1089     wtv->last_valid_pts = wtv->pts;
1090     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1091     return 0;
1092 }
1093
1094 static int read_close(AVFormatContext *s)
1095 {
1096     WtvContext *wtv = s->priv_data;
1097     wtvfile_close(wtv->pb);
1098     return 0;
1099 }
1100
1101 AVInputFormat ff_wtv_demuxer = {
1102     .name           = "wtv",
1103     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1104     .priv_data_size = sizeof(WtvContext),
1105     .read_probe     = read_probe,
1106     .read_header    = read_header,
1107     .read_packet    = read_packet,
1108     .read_seek      = read_seek,
1109     .read_close     = read_close,
1110     .flags          = AVFMT_SHOW_IDS,
1111 };