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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 FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 "avformat.h"
  31 #include "internal.h"
  32 #include "riff.h"
  33 #include "asf.h"
  34 #include "mpegts.h"
  35
  36 /* Macros for formating GUIDs */
  37 #define PRI_GUID \
  38     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
  39 #define ARG_GUID(g) \
  40     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]
  41
  42 #define PRI_PRETTY_GUID \
  43     "%08x-%04x-%04x-%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 typedef struct {
  59     ByteIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
  60
  61     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
  62     uint32_t *sectors;   /** file allocation table */
  63     int nb_sectors;      /** number of sectors */
  64
  65     int error;
  66     int64_t position;
  67     int64_t length;
  68 } WtvFile;
  69
  70 /**
  71  * @return bytes read, 0 on end of file, or <0 on error
  72  */
  73 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
  74 {
  75     WtvFile *wf = opaque;
  76     ByteIOContext *pb = wf->pb_filesystem;
  77     int nread = 0;
  78
  79     if (wf->error || url_ferror(pb))
  80         return -1;
  81     if (wf->position >= wf->length || url_feof(pb))
  82         return 0;
  83
  84     buf_size = FFMIN(buf_size, wf->length - wf->position);
  85     while(nread < buf_size) {
  86         int n;
  87         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
  88         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
  89
  90         n = get_buffer(pb, buf, read_request);
  91         if (n <= 0)
  92             break;
  93         nread += n;
  94         buf += n;
  95         wf->position += n;
  96         if (n == remaining_in_sector) {
  97             int i = wf->position >> wf->sector_bits;
  98             if (i >= wf->nb_sectors ||
  99                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
 100                 url_fseek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
 101                 wf->error = 1;
 102                 break;
 103             }
 104         }
 105     }
 106     return nread;
 107 }
 108
 109 /**
 110  * @return position (or file length)
 111  */
 112 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
 113 {
 114     WtvFile *wf = opaque;
 115     ByteIOContext *pb = wf->pb_filesystem;
 116
 117     if (whence == AVSEEK_SIZE)
 118         return wf->length;
 119     else if (whence == SEEK_CUR)
 120         offset = wf->position + offset;
 121     else if (whence == SEEK_END)
 122         offset = wf->length;
 123
 124     wf->error = offset < 0 || offset >= wf->length ||
 125                 url_fseek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
 126                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
 127     wf->position = offset;
 128     return offset;
 129 }
 130
 131 /**
 132  * read non-zero integers (le32) from input stream
 133  * @param pb
 134  * @param[out] data destination
 135  * @param     count maximum number of integers to read
 136  * @return    total number of integers read
 137  */
 138 static int read_ints(ByteIOContext *pb, uint32_t *data, int count)
 139 {
 140     int i, total = 0;
 141     for (i = 0; i < count; i++) {
 142         if ((data[total] = get_le32(pb)))
 143            total++;
 144     }
 145     return total;
 146 }
 147
 148 /**
 149  * Open file
 150  * @param first_sector  First sector
 151  * @param length        Length of file (bytes)
 152  * @param depth         File allocation table depth
 153  * @return NULL on error
 154  */
 155 static ByteIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
 156 {
 157     ByteIOContext *pb;
 158     WtvFile *wf;
 159     uint8_t *buffer;
 160
 161     if (url_fseek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
 162         return NULL;
 163
 164     wf = av_mallocz(sizeof(WtvFile));
 165     if (!wf)
 166         return NULL;
 167
 168     if (depth == 0) {
 169         wf->sectors = av_malloc(sizeof(uint32_t));
 170         if (!wf->sectors) {
 171             av_free(wf);
 172             return NULL;
 173         }
 174         wf->sectors[0]  = first_sector;
 175         wf->nb_sectors  = 1;
 176         wf->sector_bits = WTV_SECTOR_BITS;
 177     } else if (depth == 1) {
 178         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
 179         if (!wf->sectors) {
 180             av_free(wf);
 181             return NULL;
 182         }
 183         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
 184         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 185     } else if (depth == 2) {
 186         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
 187         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
 188         int i;
 189
 190         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
 191         if (!wf->sectors) {
 192             av_free(wf);
 193             return NULL;
 194         }
 195         wf->nb_sectors = 0;
 196         for (i = 0; i < nb_sectors1; i++) {
 197             if (url_fseek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
 198                 break;
 199             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
 200         }
 201         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 202     } else {
 203         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 204         av_free(wf);
 205         return NULL;
 206     }
 207
 208     if (!wf->nb_sectors) {
 209         av_free(wf->sectors);
 210         av_free(wf);
 211         return NULL;
 212     }
 213
 214     /* check length */
 215     length &= 0xFFFFFFFFFFFF;
 216     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
 217         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);
 218         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
 219     }
 220     wf->length = length;
 221
 222     /* seek to intial sector */
 223     wf->position = 0;
 224     if (url_fseek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
 225         av_free(wf->sectors);
 226         av_free(wf);
 227         return NULL;
 228     }
 229
 230     wf->pb_filesystem = s->pb;
 231     buffer = av_malloc(1 << wf->sector_bits);
 232     if (!buffer) {
 233         av_free(wf->sectors);
 234         av_free(wf);
 235         return NULL;
 236     }
 237
 238     pb = av_alloc_put_byte(buffer, 1 << wf->sector_bits, 0, wf,
 239                            wtvfile_read_packet, NULL, wtvfile_seek);
 240     if (!pb) {
 241         av_free(buffer);
 242         av_free(wf->sectors);
 243         av_free(wf);
 244     }
 245     return pb;
 246 }
 247
 248 static const ff_asf_guid dir_entry_guid =
 249     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
 250
 251 /**
 252  * Open file using filename
 253  * @param[in]  buf       directory buffer
 254  * @param      buf_size  directory buffer size
 255  * @param[in]  filename
 256  * @param      filename_size size of filename
 257  * @return NULL on error
 258  */
 259 static ByteIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
 260 {
 261     const uint8_t *buf_end = buf + buf_size;
 262
 263     while(buf + 48 <= buf_end) {
 264         int dir_length, name_size, first_sector, depth;
 265         uint64_t file_length;
 266         const uint8_t *name;
 267         if (ff_guidcmp(buf, dir_entry_guid)) {
 268             av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
 269                    "remaining directory entries ignored\n", ARG_GUID(buf));
 270             break;
 271         }
 272         dir_length  = AV_RL16(buf + 16);
 273         file_length = AV_RL64(buf + 24);
 274         name_size   = 2 * AV_RL32(buf + 32);
 275         if (buf + 48 + name_size > buf_end) {
 276             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
 277             break;
 278         }
 279         first_sector = AV_RL32(buf + 40 + name_size);
 280         depth        = AV_RL32(buf + 44 + name_size);
 281
 282         /* compare file name; test optional null terminator */
 283         name = buf + 40;
 284         if (name_size >= filename_size &&
 285             !memcmp(name, filename, filename_size) &&
 286             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
 287             return wtvfile_open_sector(first_sector, file_length, depth, s);
 288
 289         buf += dir_length;
 290     }
 291     return 0;
 292 }
 293
 294 #define wtvfile_open(s, buf, buf_size, filename) \
 295     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
 296
 297 /**
 298  * Close file opened with wtvfile_open_sector(), or wtv_open()
 299  */
 300 static void wtvfile_close(ByteIOContext *pb)
 301 {
 302     WtvFile *wf = pb->opaque;
 303     av_free(wf->sectors);
 304     av_free(pb);
 305 }
 306
 307 /*
 308  *
 309  * Main demuxer
 310  *
 311  */
 312
 313 typedef struct {
 314     int seen_data;
 315 } WtvStream;
 316
 317 typedef struct {
 318     ByteIOContext *pb;       /** timeline file */
 319     int64_t epoch;
 320     int64_t pts;             /** pts for next data chunk */
 321     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
 322
 323     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
 324        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
 325     AVIndexEntry *index_entries;
 326     int nb_index_entries;
 327     unsigned int index_entries_allocated_size;
 328 } WtvContext;
 329
 330 typedef struct {
 331     enum CodecID id;
 332     ff_asf_guid guid;
 333 } AVCodecGuid;
 334
 335 static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
 336 {
 337     int i;
 338     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
 339         if (!ff_guidcmp(guids[i].guid, guid))
 340             return guids[i].id;
 341     }
 342     return CODEC_ID_NONE;
 343 }
 344
 345 /* WTV GUIDs */
 346 static const ff_asf_guid wtv_guid =
 347     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 348 static const ff_asf_guid metadata_guid =
 349     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
 350 static const ff_asf_guid timestamp_guid =
 351     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
 352 static const ff_asf_guid data_guid =
 353     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 354 static const ff_asf_guid stream_guid =
 355     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
 356 static const ff_asf_guid stream2_guid =
 357     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 358 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
 359     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
 360 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
 361     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
 362 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
 363     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
 364 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
 365     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
 366 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
 367     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
 368 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
 369     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
 370 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
 371     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
 372 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
 373     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
 374
 375 /* Windows media GUIDs */
 376
 377 #define MEDIASUBTYPE_BASE_GUID \
 378     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
 379
 380 /* Media types */
 381 static const ff_asf_guid mediatype_audio =
 382     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
 383 static const ff_asf_guid mediatype_video =
 384     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
 385 static const ff_asf_guid mediasubtype_mpeg1payload =
 386     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 387 static const ff_asf_guid mediatype_mpeg2_sections =
 388     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 389 static const ff_asf_guid mediatype_mpeg2_pes =
 390     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 391 static const ff_asf_guid mediatype_mstvcaption =
 392     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 393
 394 /* Media subtypes */
 395 static const ff_asf_guid mediasubtype_cpfilters_processed =
 396     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 397 static const ff_asf_guid mediasubtype_dvb_subtitle =
 398     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 399 static const ff_asf_guid mediasubtype_teletext =
 400     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 401 static const ff_asf_guid mediasubtype_dtvccdata =
 402     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 403 static const ff_asf_guid mediasubtype_mpeg2_sections =
 404     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 405
 406 /* Formats */
 407 static const ff_asf_guid format_cpfilters_processed =
 408     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 409 static const ff_asf_guid format_waveformatex =
 410     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 411 static const ff_asf_guid format_videoinfo2 =
 412     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 413 static const ff_asf_guid format_mpeg2_video =
 414     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 415 static const ff_asf_guid format_none =
 416     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 417
 418 static const AVCodecGuid video_guids[] = {
 419     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 420     {CODEC_ID_NONE}
 421 };
 422
 423 static const AVCodecGuid audio_guids[] = {
 424     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 425     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
 426     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 427     {CODEC_ID_NONE}
 428 };
 429
 430 static int read_probe(AVProbeData *p)
 431 {
 432     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 433 }
 434
 435 /**
 436  * Convert win32 FILETIME to ISO-8601 string
 437  */
 438 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
 439 {
 440     time_t t = (value / 10000000LL) - 11644473600LL;
 441     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 442 }
 443
 444 /**
 445  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
 446  */
 447 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
 448 {
 449     time_t t = (value / 10000000LL) - 719162LL*86400LL;
 450     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 451 }
 452
 453 /**
 454  * Convert OLE DATE to ISO-8601 string
 455  */
 456 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
 457 {
 458     time_t t = 631112400LL + 86400*av_int2dbl(value);
 459     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 460 }
 461
 462 static void get_attachment(AVFormatContext *s, ByteIOContext *pb, int length)
 463 {
 464     char mime[1024];
 465     char description[1024];
 466     unsigned int filesize;
 467     AVStream *st;
 468     int64_t pos = url_ftell(pb);
 469
 470     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
 471     if (strcmp(mime, "image/jpeg"))
 472         goto done;
 473
 474     get_byte(pb);
 475     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
 476     filesize = get_le32(pb);
 477     if (!filesize)
 478         goto done;
 479
 480     st = av_new_stream(s, 0);
 481     if (!st)
 482         goto done;
 483     av_metadata_set2(&st->metadata, "title", description, 0);
 484     st->codec->codec_id   = CODEC_ID_MJPEG;
 485     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
 486     st->codec->extradata  = av_mallocz(filesize);
 487     if (!st->codec->extradata)
 488         goto done;
 489     st->codec->extradata_size = filesize;
 490     get_buffer(pb, st->codec->extradata, filesize);
 491 done:
 492     url_fseek(pb, pos + length, SEEK_SET);
 493 }
 494
 495 static void get_tag(AVFormatContext *s, ByteIOContext *pb, const char *key, int type, int length)
 496 {
 497     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
 498     char *buf = av_malloc(buf_size);
 499     if (!buf)
 500         return;
 501
 502     if (type == 0 && length == 4) {
 503         snprintf(buf, buf_size, "%"PRIi32, get_le32(pb));
 504     } else if (type == 1) {
 505         avio_get_str16le(pb, length, buf, buf_size);
 506         if (!strlen(buf)) {
 507            av_free(buf);
 508            return;
 509         }
 510     } else if (type == 3 && length == 4) {
 511         strcpy(buf, get_le32(pb) ? "true" : "false");
 512     } else if (type == 4 && length == 8) {
 513         int64_t num = get_le64(pb);
 514         if (!strcmp(key, "WM/EncodingTime") ||
 515             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
 516             filetime_to_iso8601(buf, buf_size, num);
 517         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
 518                  !strcmp(key, "WM/WMRVEndTime"))
 519             crazytime_to_iso8601(buf, buf_size, num);
 520         else if (!strcmp(key, "WM/WMRVExpirationDate"))
 521             oledate_to_iso8601(buf, buf_size, num);
 522         else if (!strcmp(key, "WM/WMRVBitrate"))
 523             snprintf(buf, buf_size, "%f", av_int2dbl(num));
 524         else
 525             snprintf(buf, buf_size, "%"PRIi64, num);
 526     } else if (type == 5 && length == 2) {
 527         snprintf(buf, buf_size, "%"PRIi16, get_le16(pb));
 528     } else if (type == 6 && length == 16) {
 529         ff_asf_guid guid;
 530         get_buffer(pb, guid, 16);
 531         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
 532     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
 533         get_attachment(s, pb, length);
 534         av_freep(&buf);
 535         return;
 536     } else {
 537         av_freep(&buf);
 538         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
 539         url_fskip(pb, length);
 540         return;
 541     }
 542
 543     av_metadata_set2(&s->metadata, key, buf, 0);
 544     av_freep(&buf);
 545 }
 546
 547 /**
 548  * Parse metadata entries
 549  */
 550 static void parse_legacy_attrib(AVFormatContext *s, ByteIOContext *pb)
 551 {
 552     ff_asf_guid guid;
 553     int length, type;
 554     while(!url_feof(pb)) {
 555         char key[1024];
 556         ff_get_guid(pb, &guid);
 557         type   = get_le32(pb);
 558         length = get_le32(pb);
 559         if (!length)
 560             break;
 561         if (ff_guidcmp(&guid, metadata_guid)) {
 562             av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
 563                    "remaining metadata entries ignored\n", ARG_GUID(guid));
 564             break;
 565         }
 566         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
 567         get_tag(s, pb, key, type, length);
 568     }
 569
 570     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 571 }
 572
 573 /**
 574  * parse VIDEOINFOHEADER2 structure
 575  * @return bytes consumed
 576  */
 577 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 578 {
 579     WtvContext *wtv = s->priv_data;
 580     ByteIOContext *pb = wtv->pb;
 581
 582     url_fskip(pb, 72);  // picture aspect ratio is unreliable
 583     ff_get_bmp_header(pb, st);
 584
 585     return 72 + 40;
 586 }
 587
 588 /**
 589  * Parse MPEG1WAVEFORMATEX extradata structure
 590  */
 591 static void parse_mpeg1waveformatex(AVStream *st)
 592 {
 593     /* fwHeadLayer */
 594     switch (AV_RL16(st->codec->extradata)) {
 595     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
 596     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
 597     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
 598     }
 599
 600     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
 601
 602     /* dwHeadMode */
 603     switch (AV_RL16(st->codec->extradata + 6)) {
 604     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
 605     case 8 :                   st->codec->channels = 1; break;
 606     }
 607 }
 608
 609 /**
 610  * Initialise stream
 611  * @param st Stream to initialise, or NULL to create and initialise new stream
 612  * @return NULL on error
 613  */
 614 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
 615 {
 616     if (st) {
 617         if (st->codec->extradata) {
 618             av_freep(&st->codec->extradata);
 619             st->codec->extradata_size = 0;
 620         }
 621     } else {
 622         WtvStream *wst = av_mallocz(sizeof(WtvStream));
 623         if (!wst)
 624             return NULL;
 625         st = av_new_stream(s, sid);
 626         if (!st)
 627             return NULL;
 628         st->priv_data = wst;
 629     }
 630     st->codec->codec_type = codec_type;
 631     st->need_parsing      = AVSTREAM_PARSE_FULL;
 632     av_set_pts_info(st, 64, 1, 10000000);
 633     return st;
 634 }
 635
 636 /**
 637  * parse Media Type structure and populate stream
 638  * @param st         Stream, or NULL to create new stream
 639  * @param mediatype  Mediatype GUID
 640  * @param subtype    Subtype GUID
 641  * @param formattype Format GUID
 642  * @param size       Size of format buffer
 643  * @return NULL on error
 644  */
 645 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
 646                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 647                                    ff_asf_guid formattype, int size)
 648 {
 649     WtvContext *wtv = s->priv_data;
 650     ByteIOContext *pb = wtv->pb;
 651     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 652         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 653         ff_asf_guid actual_subtype;
 654         ff_asf_guid actual_formattype;
 655
 656         if (size < 32) {
 657             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 658             url_fskip(pb, size);
 659             return NULL;
 660         }
 661
 662         url_fskip(pb, size - 32);
 663         ff_get_guid(pb, &actual_subtype);
 664         ff_get_guid(pb, &actual_formattype);
 665         url_fseek(pb, -size, SEEK_CUR);
 666
 667         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 668         url_fskip(pb, 32);
 669         return st;
 670     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 671         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
 672         if (!st)
 673             return NULL;
 674         if (!ff_guidcmp(formattype, format_waveformatex)) {
 675             ff_get_wav_header(pb, st->codec, size);
 676         } else {
 677             if (ff_guidcmp(formattype, format_none))
 678                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 679             url_fskip(pb, size);
 680         }
 681
 682         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
 683             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
 684         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 685             if (st->codec->extradata && st->codec->extradata_size >= 22)
 686                 parse_mpeg1waveformatex(st);
 687             else
 688                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 689         } else {
 690             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
 691             if (st->codec->codec_id == CODEC_ID_NONE)
 692                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
 693         }
 694         return st;
 695     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 696         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
 697         if (!st)
 698             return NULL;
 699         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 700             int consumed = parse_videoinfoheader2(s, st);
 701             url_fskip(pb, FFMAX(size - consumed, 0));
 702         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 703             int consumed = parse_videoinfoheader2(s, st);
 704             url_fskip(pb, FFMAX(size - consumed, 0));
 705         } else {
 706             if (ff_guidcmp(formattype, format_none))
 707                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 708             url_fskip(pb, size);
 709         }
 710
 711         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
 712             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 713         } else {
 714             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 715         }
 716         if (st->codec->codec_id == CODEC_ID_NONE)
 717             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
 718         return st;
 719     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 720                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 721         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 722         if (!st)
 723             return NULL;
 724         if (ff_guidcmp(formattype, format_none))
 725             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 726         url_fskip(pb, size);
 727         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
 728         return st;
 729     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 730                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 731         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 732         if (!st)
 733             return NULL;
 734         if (ff_guidcmp(formattype, format_none))
 735             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 736         url_fskip(pb, size);
 737         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
 738         return st;
 739     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 740                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 741         if (ff_guidcmp(formattype, format_none))
 742             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 743         url_fskip(pb, size);
 744         return NULL;
 745     }
 746
 747     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
 748                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
 749                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
 750     url_fskip(pb, size);
 751     return NULL;
 752 }
 753
 754 enum {
 755     SEEK_TO_DATA = 0,
 756     SEEK_TO_PTS,
 757 };
 758
 759 /**
 760  * Parse WTV chunks
 761  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
 762  * @param seekts timestamp
 763  * @param[out] len Length of data chunk
 764  * @return stream index of data chunk, or <0 on error
 765  */
 766 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 767 {
 768     WtvContext *wtv = s->priv_data;
 769     ByteIOContext *pb = wtv->pb;
 770     while (!url_feof(pb)) {
 771         ff_asf_guid g;
 772         int len, sid, consumed;
 773
 774         ff_get_guid(pb, &g);
 775         len = get_le32(pb);
 776         if (len < 32)
 777             break;
 778         sid = get_le32(pb) & 0x7FFF;
 779         url_fskip(pb, 8);
 780         consumed = 32;
 781
 782         if (!ff_guidcmp(g, stream_guid)) {
 783             if (ff_find_stream_index(s, sid) < 0) {
 784                 ff_asf_guid mediatype, subtype, formattype;
 785                 int size;
 786                     url_fskip(pb, 28);
 787                     ff_get_guid(pb, &mediatype);
 788                     ff_get_guid(pb, &subtype);
 789                     url_fskip(pb, 12);
 790                     ff_get_guid(pb, &formattype);
 791                     size = get_le32(pb);
 792                     parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
 793                     consumed += 92 + size;
 794             }
 795         } else if (!ff_guidcmp(g, stream2_guid)) {
 796             int stream_index = ff_find_stream_index(s, sid);
 797             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
 798                 ff_asf_guid mediatype, subtype, formattype;
 799                 int size;
 800                 url_fskip(pb, 12);
 801                 ff_get_guid(pb, &mediatype);
 802                 ff_get_guid(pb, &subtype);
 803                 url_fskip(pb, 12);
 804                 ff_get_guid(pb, &formattype);
 805                 size = get_le32(pb);
 806                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
 807                 consumed += 76 + size;
 808             }
 809         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 810                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 811                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 812                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 813                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 814                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 815             int stream_index = ff_find_stream_index(s, sid);
 816             if (stream_index >= 0) {
 817                 AVStream *st = s->streams[stream_index];
 818                 uint8_t buf[258];
 819                 const uint8_t *pbuf = buf;
 820                 int buf_size;
 821
 822                 url_fskip(pb, 8);
 823                 consumed += 8;
 824                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 825                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 826                     url_fskip(pb, 6);
 827                     consumed += 6;
 828                 }
 829
 830                 buf_size = FFMIN(len - consumed, sizeof(buf));
 831                 get_buffer(pb, buf, buf_size);
 832                 consumed += buf_size;
 833                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
 834             }
 835         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 836             int stream_index = ff_find_stream_index(s, sid);
 837             if (stream_index >= 0) {
 838                 url_fskip(pb, 12);
 839                 if (get_le32(pb))
 840                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 841                 consumed += 16;
 842             }
 843         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 844             int stream_index = ff_find_stream_index(s, sid);
 845             if (stream_index >= 0) {
 846                 AVStream *st = s->streams[stream_index];
 847                 uint8_t language[4];
 848                 url_fskip(pb, 12);
 849                 get_buffer(pb, language, 3);
 850                 if (language[0]) {
 851                     language[3] = 0;
 852                     av_metadata_set2(&st->metadata, "language", language, 0);
 853                 }
 854                 consumed += 15;
 855             }
 856         } else if (!ff_guidcmp(g, timestamp_guid)) {
 857             int stream_index = ff_find_stream_index(s, sid);
 858             if (stream_index >= 0) {
 859                 url_fskip(pb, 8);
 860                 wtv->pts = get_le64(pb);
 861                 consumed += 16;
 862                 if (wtv->pts == -1)
 863                     wtv->pts = AV_NOPTS_VALUE;
 864                 else {
 865                     wtv->last_valid_pts = wtv->pts;
 866                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
 867                         wtv->epoch = wtv->pts;
 868                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 869 #define WTV_PAD8(x) (((x) + 7) & ~7)
 870                     url_fskip(pb, WTV_PAD8(len) - consumed);
 871                     return 0;
 872                 }
 873                 }
 874             }
 875         } else if (!ff_guidcmp(g, data_guid)) {
 876             int stream_index = ff_find_stream_index(s, sid);
 877             if (mode == SEEK_TO_DATA && stream_index >= 0) {
 878                 WtvStream *wst = s->streams[stream_index]->priv_data;
 879                 wst->seen_data = 1;
 880                 if (len_ptr) {
 881                     *len_ptr = len;
 882                 }
 883                 return stream_index;
 884             }
 885         } else if (
 886             !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}) ||
 887             !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}) ||
 888             !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}) ||
 889             !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}) ||
 890             !ff_guidcmp(g, /* EVENTID_AudioTypeSpanningEvent */ (const ff_asf_guid){0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3}) ||
 891             !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}) ||
 892             !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}) ||
 893             !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}) ||
 894             !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}) ||
 895             !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}) ||
 896             !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}) ||
 897             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 898             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 899             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 900             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 901             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 902             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 903             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 904             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 905             //ignore known guids
 906         } else
 907             av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
 908
 909         url_fskip(pb, WTV_PAD8(len) - consumed);
 910     }
 911     return AVERROR_EOF;
 912 }
 913
 914 /* declare utf16le strings */
 915 #define _ , 0,
 916 static const uint8_t timeline_le16[] =
 917     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
 918 static const uint8_t table_0_entries_legacy_attrib_le16[] =
 919     {'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};
 920 static const uint8_t table_0_entries_time_le16[] =
 921     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
 922 static const uint8_t timeline_table_0_entries_Events_le16[] =
 923     {'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};
 924 #undef _
 925
 926 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
 927 {
 928     WtvContext *wtv = s->priv_data;
 929     int root_sector, root_size;
 930     uint8_t root[WTV_SECTOR_SIZE];
 931     ByteIOContext *pb;
 932     int64_t timeline_pos;
 933     int ret;
 934
 935     wtv->epoch          =
 936     wtv->pts            =
 937     wtv->last_valid_pts = AV_NOPTS_VALUE;
 938
 939     /* read root directory sector */
 940     url_fskip(s->pb, 0x30);
 941     root_size = get_le32(s->pb);
 942     if (root_size > sizeof(root)) {
 943         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
 944         return AVERROR_INVALIDDATA;
 945     }
 946     url_fskip(s->pb, 4);
 947     root_sector = get_le32(s->pb);
 948
 949     url_fseek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
 950     root_size = get_buffer(s->pb, root, root_size);
 951     if (root_size < 0)
 952         return AVERROR_INVALIDDATA;
 953
 954     /* parse chunks up until first data chunk */
 955     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
 956     if (!wtv->pb) {
 957         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
 958         return AVERROR_INVALIDDATA;
 959     }
 960
 961     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 962     if (ret < 0)
 963         return ret;
 964     url_fseek(wtv->pb, -32, SEEK_CUR);
 965
 966     timeline_pos = url_ftell(s->pb); // save before opening another file
 967
 968     /* read metadata */
 969     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
 970     if (pb) {
 971         parse_legacy_attrib(s, pb);
 972         wtvfile_close(pb);
 973     }
 974
 975     /* read seek index */
 976     if (s->nb_streams) {
 977         AVStream *st = s->streams[0];
 978         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
 979         if (pb) {
 980             while(1) {
 981                 uint64_t timestamp = get_le64(pb);
 982                 uint64_t frame_nb  = get_le64(pb);
 983                 if (url_feof(pb))
 984                     break;
 985                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
 986                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
 987             }
 988             wtvfile_close(pb);
 989
 990             if (wtv->nb_index_entries) {
 991                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
 992                 if (pb) {
 993                     int i;
 994                     while (1) {
 995                         uint64_t frame_nb = get_le64(pb);
 996                         uint64_t position = get_le64(pb);
 997                         if (url_feof(pb))
 998                             break;
 999                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1000                             AVIndexEntry *e = wtv->index_entries + i;
1001                             if (frame_nb > e->size)
1002                                 break;
1003                             if (position > e->pos)
1004                                 e->pos = position;
1005                         }
1006                     }
1007                     wtvfile_close(pb);
1008                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1009                 }
1010             }
1011         }
1012     }
1013
1014     url_fseek(s->pb, timeline_pos, SEEK_SET);
1015     return 0;
1016 }
1017
1018 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1019 {
1020     WtvContext *wtv = s->priv_data;
1021     ByteIOContext *pb = wtv->pb;
1022     int stream_index, len, ret;
1023
1024     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1025     if (stream_index < 0)
1026         return stream_index;
1027
1028     ret = av_get_packet(pb, pkt, len - 32);
1029     if (ret < 0)
1030         return ret;
1031     pkt->stream_index = stream_index;
1032     pkt->pts          = wtv->pts;
1033     url_fskip(pb, WTV_PAD8(len) - len);
1034     return 0;
1035 }
1036
1037 static int read_seek(AVFormatContext *s, int stream_index,
1038                      int64_t ts, int flags)
1039 {
1040     WtvContext *wtv = s->priv_data;
1041     ByteIOContext *pb = wtv->pb;
1042     AVStream *st = s->streams[0];
1043     int64_t ts_relative;
1044     int i;
1045
1046     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1047         return AVERROR_NOTSUPP;
1048
1049     /* timestamp adjustment is required because wtv->pts values are absolute,
1050      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1051     ts_relative = ts;
1052     if (wtv->epoch != AV_NOPTS_VALUE)
1053         ts_relative -= wtv->epoch;
1054
1055     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1056     if (i < 0) {
1057         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1058             url_fseek(pb, 0, SEEK_SET);
1059         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1060             url_fseek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1061         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1062             return AVERROR(ERANGE);
1063         return 0;
1064     }
1065     wtv->pts = wtv->index_entries[i].timestamp;
1066     if (wtv->epoch != AV_NOPTS_VALUE)
1067         wtv->pts += wtv->epoch;
1068     wtv->last_valid_pts = wtv->pts;
1069     url_fseek(pb, wtv->index_entries[i].pos, SEEK_SET);
1070     return 0;
1071 }
1072
1073 static int read_close(AVFormatContext *s)
1074 {
1075     WtvContext *wtv = s->priv_data;
1076     wtvfile_close(wtv->pb);
1077     return 0;
1078 }
1079
1080 AVInputFormat ff_wtv_demuxer = {
1081     .name           = "wtv",
1082     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1083     .priv_data_size = sizeof(WtvContext),
1084     .read_probe     = read_probe,
1085     .read_header    = read_header,
1086     .read_packet    = read_packet,
1087     .read_seek      = read_seek,
1088     .read_close     = read_close,
1089     .flags          = AVFMT_SHOW_IDS,
1090 };