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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/channel_layout.h"
  29 #include "libavutil/intreadwrite.h"
  30 #include "libavutil/intfloat.h"
  31 #include "libavutil/dict.h"
  32 #include "avformat.h"
  33 #include "internal.h"
  34 #include "riff.h"
  35 #include "asf.h"
  36 #include "mpegts.h"
  37
  38 /* Macros for formating GUIDs */
  39 #define PRI_PRETTY_GUID \
  40     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
  41 #define ARG_PRETTY_GUID(g) \
  42     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]
  43 #define LEN_PRETTY_GUID 34
  44
  45 /*
  46  *
  47  * File system routines
  48  *
  49  */
  50
  51 #define WTV_SECTOR_BITS    12
  52 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
  53 #define WTV_BIGSECTOR_BITS 18
  54
  55 #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)
  56
  57 typedef struct {
  58     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
  59
  60     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
  61     uint32_t *sectors;   /** file allocation table */
  62     int nb_sectors;      /** number of sectors */
  63
  64     int error;
  65     int64_t position;
  66     int64_t length;
  67 } WtvFile;
  68
  69 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
  70 {
  71     return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);
  72 }
  73
  74 /**
  75  * @return bytes read, 0 on end of file, or <0 on error
  76  */
  77 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
  78 {
  79     WtvFile *wf = opaque;
  80     AVIOContext *pb = wf->pb_filesystem;
  81     int nread = 0;
  82
  83     if (wf->error || pb->error)
  84         return -1;
  85     if (wf->position >= wf->length || pb->eof_reached)
  86         return 0;
  87
  88     buf_size = FFMIN(buf_size, wf->length - wf->position);
  89     while(nread < buf_size) {
  90         int n;
  91         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
  92         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
  93
  94         n = avio_read(pb, buf, read_request);
  95         if (n <= 0)
  96             break;
  97         nread += n;
  98         buf += n;
  99         wf->position += n;
 100         if (n == remaining_in_sector) {
 101             int i = wf->position >> wf->sector_bits;
 102             if (i >= wf->nb_sectors ||
 103                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
 104                 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
 105                 wf->error = 1;
 106                 break;
 107             }
 108         }
 109     }
 110     return nread;
 111 }
 112
 113 /**
 114  * @return position (or file length)
 115  */
 116 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
 117 {
 118     WtvFile *wf = opaque;
 119     AVIOContext *pb = wf->pb_filesystem;
 120
 121     if (whence == AVSEEK_SIZE)
 122         return wf->length;
 123     else if (whence == SEEK_CUR)
 124         offset = wf->position + offset;
 125     else if (whence == SEEK_END)
 126         offset = wf->length;
 127
 128     wf->error = offset < 0 || offset >= wf->length ||
 129                 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
 130                                offset & ((1 << wf->sector_bits) - 1)) < 0;
 131     wf->position = offset;
 132     return offset;
 133 }
 134
 135 /**
 136  * read non-zero integers (le32) from input stream
 137  * @param pb
 138  * @param[out] data destination
 139  * @param     count maximum number of integers to read
 140  * @return    total number of integers read
 141  */
 142 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
 143 {
 144     int i, total = 0;
 145     for (i = 0; i < count; i++) {
 146         if ((data[total] = avio_rl32(pb)))
 147            total++;
 148     }
 149     return total;
 150 }
 151
 152 /**
 153  * Open file
 154  * @param first_sector  First sector
 155  * @param length        Length of file (bytes)
 156  * @param depth         File allocation table depth
 157  * @return NULL on error
 158  */
 159 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
 160 {
 161     AVIOContext *pb;
 162     WtvFile *wf;
 163     uint8_t *buffer;
 164
 165     if (seek_by_sector(s->pb, first_sector, 0) < 0)
 166         return NULL;
 167
 168     wf = av_mallocz(sizeof(WtvFile));
 169     if (!wf)
 170         return NULL;
 171
 172     if (depth == 0) {
 173         wf->sectors = av_malloc(sizeof(uint32_t));
 174         if (!wf->sectors) {
 175             av_free(wf);
 176             return NULL;
 177         }
 178         wf->sectors[0]  = first_sector;
 179         wf->nb_sectors  = 1;
 180         wf->sector_bits = WTV_SECTOR_BITS;
 181     } else if (depth == 1) {
 182         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
 183         if (!wf->sectors) {
 184             av_free(wf);
 185             return NULL;
 186         }
 187         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
 188         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 189     } else if (depth == 2) {
 190         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
 191         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
 192         int i;
 193
 194         wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));
 195         if (!wf->sectors) {
 196             av_free(wf);
 197             return NULL;
 198         }
 199         wf->nb_sectors = 0;
 200         for (i = 0; i < nb_sectors1; i++) {
 201             if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
 202                 break;
 203             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
 204         }
 205         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 206     } else {
 207         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 208         av_free(wf);
 209         return NULL;
 210     }
 211
 212     if (!wf->nb_sectors) {
 213         av_free(wf->sectors);
 214         av_free(wf);
 215         return NULL;
 216     }
 217
 218     /* check length */
 219     length &= 0xFFFFFFFFFFFF;
 220     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
 221         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);
 222         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
 223     }
 224     wf->length = length;
 225
 226     /* seek to initial sector */
 227     wf->position = 0;
 228     if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
 229         av_free(wf->sectors);
 230         av_free(wf);
 231         return NULL;
 232     }
 233
 234     wf->pb_filesystem = s->pb;
 235     buffer = av_malloc(1 << wf->sector_bits);
 236     if (!buffer) {
 237         av_free(wf->sectors);
 238         av_free(wf);
 239         return NULL;
 240     }
 241
 242     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
 243                            wtvfile_read_packet, NULL, wtvfile_seek);
 244     if (!pb) {
 245         av_free(buffer);
 246         av_free(wf->sectors);
 247         av_free(wf);
 248     }
 249     return pb;
 250 }
 251
 252 static const ff_asf_guid dir_entry_guid =
 253     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
 254
 255 /**
 256  * Open file using filename
 257  * @param[in]  buf       directory buffer
 258  * @param      buf_size  directory buffer size
 259  * @param[in]  filename
 260  * @param      filename_size size of filename
 261  * @return NULL on error
 262  */
 263 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
 264 {
 265     const uint8_t *buf_end = buf + buf_size;
 266
 267     while(buf + 48 <= buf_end) {
 268         int dir_length, name_size, first_sector, depth;
 269         uint64_t file_length;
 270         const uint8_t *name;
 271         if (ff_guidcmp(buf, dir_entry_guid)) {
 272             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
 273                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
 274             break;
 275         }
 276         dir_length  = AV_RL16(buf + 16);
 277         file_length = AV_RL64(buf + 24);
 278         name_size   = 2 * AV_RL32(buf + 32);
 279         if (name_size < 0) {
 280             av_log(s, AV_LOG_ERROR,
 281                    "bad filename length, remaining directory entries ignored\n");
 282             break;
 283         }
 284         if (48 + name_size > buf_end - buf) {
 285             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
 286             break;
 287         }
 288         first_sector = AV_RL32(buf + 40 + name_size);
 289         depth        = AV_RL32(buf + 44 + name_size);
 290
 291         /* compare file name; test optional null terminator */
 292         name = buf + 40;
 293         if (name_size >= filename_size &&
 294             !memcmp(name, filename, filename_size) &&
 295             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
 296             return wtvfile_open_sector(first_sector, file_length, depth, s);
 297
 298         buf += dir_length;
 299     }
 300     return 0;
 301 }
 302
 303 #define wtvfile_open(s, buf, buf_size, filename) \
 304     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
 305
 306 /**
 307  * Close file opened with wtvfile_open_sector(), or wtv_open()
 308  */
 309 static void wtvfile_close(AVIOContext *pb)
 310 {
 311     WtvFile *wf = pb->opaque;
 312     av_free(wf->sectors);
 313     av_free(wf);
 314     av_free(pb->buffer);
 315     av_free(pb);
 316 }
 317
 318 /*
 319  *
 320  * Main demuxer
 321  *
 322  */
 323
 324 typedef struct {
 325     int seen_data;
 326 } WtvStream;
 327
 328 typedef struct {
 329     AVIOContext *pb;       /** timeline file */
 330     int64_t epoch;
 331     int64_t pts;             /** pts for next data chunk */
 332     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
 333
 334     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
 335        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
 336     AVIndexEntry *index_entries;
 337     int nb_index_entries;
 338     unsigned int index_entries_allocated_size;
 339 } WtvContext;
 340
 341 /* WTV GUIDs */
 342 static const ff_asf_guid wtv_guid =
 343     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 344 static const ff_asf_guid metadata_guid =
 345     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
 346 static const ff_asf_guid timestamp_guid =
 347     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
 348 static const ff_asf_guid data_guid =
 349     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 350 static const ff_asf_guid stream_guid =
 351     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
 352 static const ff_asf_guid stream2_guid =
 353     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 354 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
 355     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
 356 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
 357     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
 358 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
 359     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
 360 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
 361     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
 362 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
 363     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
 364 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
 365     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
 366 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
 367     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
 368 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
 369     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
 370 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
 371     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
 372
 373 /* Windows media GUIDs */
 374
 375 /* Media types */
 376 static const ff_asf_guid mediatype_audio =
 377     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 378 static const ff_asf_guid mediatype_video =
 379     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
 380 static const ff_asf_guid mediasubtype_mpeg1payload =
 381     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 382 static const ff_asf_guid mediatype_mpeg2_sections =
 383     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 384 static const ff_asf_guid mediatype_mpeg2_pes =
 385     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 386 static const ff_asf_guid mediatype_mstvcaption =
 387     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 388
 389 /* Media subtypes */
 390 static const ff_asf_guid mediasubtype_cpfilters_processed =
 391     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 392 static const ff_asf_guid mediasubtype_dvb_subtitle =
 393     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 394 static const ff_asf_guid mediasubtype_teletext =
 395     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 396 static const ff_asf_guid mediasubtype_dtvccdata =
 397     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 398 static const ff_asf_guid mediasubtype_mpeg2_sections =
 399     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 400
 401 /* Formats */
 402 static const ff_asf_guid format_cpfilters_processed =
 403     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 404 static const ff_asf_guid format_waveformatex =
 405     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 406 static const ff_asf_guid format_videoinfo2 =
 407     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 408 static const ff_asf_guid format_mpeg2_video =
 409     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 410 static const ff_asf_guid format_none =
 411     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 412
 413 static const AVCodecGuid video_guids[] = {
 414     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 415     {AV_CODEC_ID_NONE}
 416 };
 417
 418 static int read_probe(AVProbeData *p)
 419 {
 420     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 421 }
 422
 423 /**
 424  * Convert win32 FILETIME to ISO-8601 string
 425  */
 426 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
 427 {
 428     time_t t = (value / 10000000LL) - 11644473600LL;
 429     struct tm *tm = gmtime(&t);
 430     if (tm)
 431         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 432     else
 433         buf[0] = '\0';
 434 }
 435
 436 /**
 437  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
 438  */
 439 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
 440 {
 441     time_t t = (value / 10000000LL) - 719162LL*86400LL;
 442     struct tm *tm = gmtime(&t);
 443     if (tm)
 444         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 445     else
 446         buf[0] = '\0';
 447 }
 448
 449 /**
 450  * Convert OLE DATE to ISO-8601 string
 451  */
 452 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
 453 {
 454     time_t t = 631112400LL + 86400*av_int2double(value);
 455     struct tm *tm = gmtime(&t);
 456     if (tm)
 457         strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 458     else
 459         buf[0] = '\0';
 460 }
 461
 462 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
 463 {
 464     char mime[1024];
 465     char description[1024];
 466     unsigned int filesize;
 467     AVStream *st;
 468     int64_t pos = avio_tell(pb);
 469
 470     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
 471     if (strcmp(mime, "image/jpeg"))
 472         goto done;
 473
 474     avio_r8(pb);
 475     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
 476     filesize = avio_rl32(pb);
 477     if (!filesize)
 478         goto done;
 479
 480     st = avformat_new_stream(s, NULL);
 481     if (!st)
 482         goto done;
 483     av_dict_set(&st->metadata, "title", description, 0);
 484     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
 485     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
 486     st->codec->extradata  = av_mallocz(filesize);
 487     st->id = -1;
 488     if (!st->codec->extradata)
 489         goto done;
 490     st->codec->extradata_size = filesize;
 491     avio_read(pb, st->codec->extradata, filesize);
 492 done:
 493     avio_seek(pb, pos + length, SEEK_SET);
 494 }
 495
 496 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
 497 {
 498     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
 499     char *buf = av_malloc(buf_size);
 500     if (!buf)
 501         return;
 502
 503     if (type == 0 && length == 4) {
 504         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
 505     } else if (type == 1) {
 506         avio_get_str16le(pb, length, buf, buf_size);
 507         if (!strlen(buf)) {
 508            av_free(buf);
 509            return;
 510         }
 511     } else if (type == 3 && length == 4) {
 512         strcpy(buf, avio_rl32(pb) ? "true" : "false");
 513     } else if (type == 4 && length == 8) {
 514         int64_t num = avio_rl64(pb);
 515         if (!strcmp(key, "WM/EncodingTime") ||
 516             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
 517             filetime_to_iso8601(buf, buf_size, num);
 518         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
 519                  !strcmp(key, "WM/WMRVEndTime"))
 520             crazytime_to_iso8601(buf, buf_size, num);
 521         else if (!strcmp(key, "WM/WMRVExpirationDate"))
 522             oledate_to_iso8601(buf, buf_size, num);
 523         else if (!strcmp(key, "WM/WMRVBitrate"))
 524             snprintf(buf, buf_size, "%f", av_int2double(num));
 525         else
 526             snprintf(buf, buf_size, "%"PRIi64, num);
 527     } else if (type == 5 && length == 2) {
 528         snprintf(buf, buf_size, "%u", avio_rl16(pb));
 529     } else if (type == 6 && length == 16) {
 530         ff_asf_guid guid;
 531         avio_read(pb, guid, 16);
 532         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
 533     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
 534         get_attachment(s, pb, length);
 535         av_freep(&buf);
 536         return;
 537     } else {
 538         av_freep(&buf);
 539         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
 540         avio_skip(pb, length);
 541         return;
 542     }
 543
 544     av_dict_set(&s->metadata, key, buf, 0);
 545     av_freep(&buf);
 546 }
 547
 548 /**
 549  * Parse metadata entries
 550  */
 551 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
 552 {
 553     ff_asf_guid guid;
 554     int length, type;
 555     while(!pb->eof_reached) {
 556         char key[1024];
 557         ff_get_guid(pb, &guid);
 558         type   = avio_rl32(pb);
 559         length = avio_rl32(pb);
 560         if (!length)
 561             break;
 562         if (ff_guidcmp(&guid, metadata_guid)) {
 563             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
 564                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
 565             break;
 566         }
 567         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
 568         get_tag(s, pb, key, type, length);
 569     }
 570
 571     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 572 }
 573
 574 /**
 575  * parse VIDEOINFOHEADER2 structure
 576  * @return bytes consumed
 577  */
 578 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 579 {
 580     WtvContext *wtv = s->priv_data;
 581     AVIOContext *pb = wtv->pb;
 582
 583     avio_skip(pb, 72);  // picture aspect ratio is unreliable
 584     ff_get_bmp_header(pb, st);
 585
 586     return 72 + 40;
 587 }
 588
 589 /**
 590  * Parse MPEG1WAVEFORMATEX extradata structure
 591  */
 592 static void parse_mpeg1waveformatex(AVStream *st)
 593 {
 594     /* fwHeadLayer */
 595     switch (AV_RL16(st->codec->extradata)) {
 596     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
 597     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
 598     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
 599     }
 600
 601     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
 602
 603     /* dwHeadMode */
 604     switch (AV_RL16(st->codec->extradata + 6)) {
 605     case 1 :
 606     case 2 :
 607     case 4 : st->codec->channels       = 2;
 608              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
 609              break;
 610     case 8 : st->codec->channels       = 1;
 611              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
 612              break;
 613     }
 614 }
 615
 616 /**
 617  * Initialise stream
 618  * @param st Stream to initialise, or NULL to create and initialise new stream
 619  * @return NULL on error
 620  */
 621 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
 622 {
 623     if (st) {
 624         if (st->codec->extradata) {
 625             av_freep(&st->codec->extradata);
 626             st->codec->extradata_size = 0;
 627         }
 628     } else {
 629         WtvStream *wst = av_mallocz(sizeof(WtvStream));
 630         if (!wst)
 631             return NULL;
 632         st = avformat_new_stream(s, NULL);
 633         if (!st)
 634             return NULL;
 635         st->id = sid;
 636         st->priv_data = wst;
 637     }
 638     st->codec->codec_type = codec_type;
 639     st->need_parsing      = AVSTREAM_PARSE_FULL;
 640     avpriv_set_pts_info(st, 64, 1, 10000000);
 641     return st;
 642 }
 643
 644 /**
 645  * parse Media Type structure and populate stream
 646  * @param st         Stream, or NULL to create new stream
 647  * @param mediatype  Mediatype GUID
 648  * @param subtype    Subtype GUID
 649  * @param formattype Format GUID
 650  * @param size       Size of format buffer
 651  * @return NULL on error
 652  */
 653 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
 654                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 655                                    ff_asf_guid formattype, int size)
 656 {
 657     WtvContext *wtv = s->priv_data;
 658     AVIOContext *pb = wtv->pb;
 659     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 660         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 661         ff_asf_guid actual_subtype;
 662         ff_asf_guid actual_formattype;
 663
 664         if (size < 32) {
 665             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 666             avio_skip(pb, size);
 667             return NULL;
 668         }
 669
 670         avio_skip(pb, size - 32);
 671         ff_get_guid(pb, &actual_subtype);
 672         ff_get_guid(pb, &actual_formattype);
 673         avio_seek(pb, -size, SEEK_CUR);
 674
 675         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 676         avio_skip(pb, 32);
 677         return st;
 678     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 679         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
 680         if (!st)
 681             return NULL;
 682         if (!ff_guidcmp(formattype, format_waveformatex)) {
 683             int ret = ff_get_wav_header(pb, st->codec, size);
 684             if (ret < 0)
 685                 return NULL;
 686         } else {
 687             if (ff_guidcmp(formattype, format_none))
 688                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 689             avio_skip(pb, size);
 690         }
 691
 692         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 693             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
 694         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 695             if (st->codec->extradata && st->codec->extradata_size >= 22)
 696                 parse_mpeg1waveformatex(st);
 697             else
 698                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 699         } else {
 700             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
 701             if (st->codec->codec_id == AV_CODEC_ID_NONE)
 702                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 703         }
 704         return st;
 705     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 706         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
 707         if (!st)
 708             return NULL;
 709         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 710             int consumed = parse_videoinfoheader2(s, st);
 711             avio_skip(pb, FFMAX(size - consumed, 0));
 712         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 713             int consumed = parse_videoinfoheader2(s, st);
 714             avio_skip(pb, FFMAX(size - consumed, 0));
 715         } else {
 716             if (ff_guidcmp(formattype, format_none))
 717                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 718             avio_skip(pb, size);
 719         }
 720
 721         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
 722             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 723         } else {
 724             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 725         }
 726         if (st->codec->codec_id == AV_CODEC_ID_NONE)
 727             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
 728         return st;
 729     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 730                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 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:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 736         avio_skip(pb, size);
 737         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
 738         return st;
 739     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 740                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 741         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 742         if (!st)
 743             return NULL;
 744         if (ff_guidcmp(formattype, format_none))
 745             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 746         avio_skip(pb, size);
 747         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;
 748         return st;
 749     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 750                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 751         if (ff_guidcmp(formattype, format_none))
 752             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
 753         avio_skip(pb, size);
 754         return NULL;
 755     }
 756
 757     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
 758                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
 759                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
 760     avio_skip(pb, size);
 761     return NULL;
 762 }
 763
 764 enum {
 765     SEEK_TO_DATA = 0,
 766     SEEK_TO_PTS,
 767 };
 768
 769 /**
 770  * Parse WTV chunks
 771  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
 772  * @param seekts timestamp
 773  * @param[out] len_ptr Length of data chunk
 774  * @return stream index of data chunk, or <0 on error
 775  */
 776 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 777 {
 778     WtvContext *wtv = s->priv_data;
 779     AVIOContext *pb = wtv->pb;
 780     while (!pb->eof_reached) {
 781         ff_asf_guid g;
 782         int len, sid, consumed;
 783
 784         ff_get_guid(pb, &g);
 785         len = avio_rl32(pb);
 786         if (len < 32)
 787             break;
 788         sid = avio_rl32(pb) & 0x7FFF;
 789         avio_skip(pb, 8);
 790         consumed = 32;
 791
 792         if (!ff_guidcmp(g, stream_guid)) {
 793             if (ff_find_stream_index(s, sid) < 0) {
 794                 ff_asf_guid mediatype, subtype, formattype;
 795                 int size;
 796                 avio_skip(pb, 28);
 797                 ff_get_guid(pb, &mediatype);
 798                 ff_get_guid(pb, &subtype);
 799                 avio_skip(pb, 12);
 800                 ff_get_guid(pb, &formattype);
 801                 size = avio_rl32(pb);
 802                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
 803                 consumed += 92 + size;
 804             }
 805         } else if (!ff_guidcmp(g, stream2_guid)) {
 806             int stream_index = ff_find_stream_index(s, sid);
 807             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
 808                 ff_asf_guid mediatype, subtype, formattype;
 809                 int size;
 810                 avio_skip(pb, 12);
 811                 ff_get_guid(pb, &mediatype);
 812                 ff_get_guid(pb, &subtype);
 813                 avio_skip(pb, 12);
 814                 ff_get_guid(pb, &formattype);
 815                 size = avio_rl32(pb);
 816                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
 817                 consumed += 76 + size;
 818             }
 819         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 820                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 821                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 822                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 823                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 824                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 825             int stream_index = ff_find_stream_index(s, sid);
 826             if (stream_index >= 0) {
 827                 AVStream *st = s->streams[stream_index];
 828                 uint8_t buf[258];
 829                 const uint8_t *pbuf = buf;
 830                 int buf_size;
 831
 832                 avio_skip(pb, 8);
 833                 consumed += 8;
 834                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 835                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 836                     avio_skip(pb, 6);
 837                     consumed += 6;
 838                 }
 839
 840                 buf_size = FFMIN(len - consumed, sizeof(buf));
 841                 avio_read(pb, buf, buf_size);
 842                 consumed += buf_size;
 843                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
 844             }
 845         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
 846             int stream_index = ff_find_stream_index(s, sid);
 847             if (stream_index >= 0) {
 848                 AVStream *st = s->streams[stream_index];
 849                 int audio_type;
 850                 avio_skip(pb, 8);
 851                 audio_type = avio_r8(pb);
 852                 if (audio_type == 2)
 853                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
 854                 else if (audio_type == 3)
 855                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 856                 consumed += 9;
 857             }
 858         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 859             int stream_index = ff_find_stream_index(s, sid);
 860             if (stream_index >= 0) {
 861                 avio_skip(pb, 12);
 862                 if (avio_rl32(pb))
 863                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 864                 consumed += 16;
 865             }
 866         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 867             int stream_index = ff_find_stream_index(s, sid);
 868             if (stream_index >= 0) {
 869                 AVStream *st = s->streams[stream_index];
 870                 uint8_t language[4];
 871                 avio_skip(pb, 12);
 872                 avio_read(pb, language, 3);
 873                 if (language[0]) {
 874                     language[3] = 0;
 875                     av_dict_set(&st->metadata, "language", language, 0);
 876                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
 877                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 878                 }
 879                 consumed += 15;
 880             }
 881         } else if (!ff_guidcmp(g, timestamp_guid)) {
 882             int stream_index = ff_find_stream_index(s, sid);
 883             if (stream_index >= 0) {
 884                 avio_skip(pb, 8);
 885                 wtv->pts = avio_rl64(pb);
 886                 consumed += 16;
 887                 if (wtv->pts == -1)
 888                     wtv->pts = AV_NOPTS_VALUE;
 889                 else {
 890                     wtv->last_valid_pts = wtv->pts;
 891                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
 892                         wtv->epoch = wtv->pts;
 893                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 894 #define WTV_PAD8(x) (((x) + 7) & ~7)
 895                     avio_skip(pb, WTV_PAD8(len) - consumed);
 896                     return 0;
 897                 }
 898                 }
 899             }
 900         } else if (!ff_guidcmp(g, data_guid)) {
 901             int stream_index = ff_find_stream_index(s, sid);
 902             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
 903                 WtvStream *wst = s->streams[stream_index]->priv_data;
 904                 wst->seen_data = 1;
 905                 if (len_ptr) {
 906                     *len_ptr = len;
 907                 }
 908                 return stream_index;
 909             }
 910         } else if (
 911             !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}) ||
 912             !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}) ||
 913             !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}) ||
 914             !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}) ||
 915             !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}) ||
 916             !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}) ||
 917             !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}) ||
 918             !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}) ||
 919             !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}) ||
 920             !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}) ||
 921             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 922             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 923             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 924             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 925             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 926             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 927             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 928             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 929             //ignore known guids
 930         } else
 931             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
 932
 933         avio_skip(pb, WTV_PAD8(len) - consumed);
 934     }
 935     return AVERROR_EOF;
 936 }
 937
 938 /* declare utf16le strings */
 939 #define _ , 0,
 940 static const uint8_t timeline_le16[] =
 941     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
 942 static const uint8_t table_0_entries_legacy_attrib_le16[] =
 943     {'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};
 944 static const uint8_t table_0_entries_time_le16[] =
 945     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
 946 static const uint8_t timeline_table_0_entries_Events_le16[] =
 947     {'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};
 948 #undef _
 949
 950 static int read_header(AVFormatContext *s)
 951 {
 952     WtvContext *wtv = s->priv_data;
 953     int root_sector, root_size;
 954     uint8_t root[WTV_SECTOR_SIZE];
 955     AVIOContext *pb;
 956     int64_t timeline_pos;
 957     int ret;
 958
 959     wtv->epoch          =
 960     wtv->pts            =
 961     wtv->last_valid_pts = AV_NOPTS_VALUE;
 962
 963     /* read root directory sector */
 964     avio_skip(s->pb, 0x30);
 965     root_size = avio_rl32(s->pb);
 966     if (root_size > sizeof(root)) {
 967         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
 968         return AVERROR_INVALIDDATA;
 969     }
 970     avio_skip(s->pb, 4);
 971     root_sector = avio_rl32(s->pb);
 972
 973     seek_by_sector(s->pb, root_sector, 0);
 974     root_size = avio_read(s->pb, root, root_size);
 975     if (root_size < 0)
 976         return AVERROR_INVALIDDATA;
 977
 978     /* parse chunks up until first data chunk */
 979     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
 980     if (!wtv->pb) {
 981         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
 982         return AVERROR_INVALIDDATA;
 983     }
 984
 985     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 986     if (ret < 0)
 987         return ret;
 988     avio_seek(wtv->pb, -32, SEEK_CUR);
 989
 990     timeline_pos = avio_tell(s->pb); // save before opening another file
 991
 992     /* read metadata */
 993     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
 994     if (pb) {
 995         parse_legacy_attrib(s, pb);
 996         wtvfile_close(pb);
 997     }
 998
 999     /* read seek index */
1000     if (s->nb_streams) {
1001         AVStream *st = s->streams[0];
1002         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1003         if (pb) {
1004             while(1) {
1005                 uint64_t timestamp = avio_rl64(pb);
1006                 uint64_t frame_nb  = avio_rl64(pb);
1007                 if (pb->eof_reached)
1008                     break;
1009                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1010                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1011             }
1012             wtvfile_close(pb);
1013
1014             if (wtv->nb_index_entries) {
1015                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1016                 if (pb) {
1017                     int i;
1018                     while (1) {
1019                         uint64_t frame_nb = avio_rl64(pb);
1020                         uint64_t position = avio_rl64(pb);
1021                         if (pb->eof_reached)
1022                             break;
1023                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1024                             AVIndexEntry *e = wtv->index_entries + i;
1025                             if (frame_nb > e->size)
1026                                 break;
1027                             if (position > e->pos)
1028                                 e->pos = position;
1029                         }
1030                     }
1031                     wtvfile_close(pb);
1032                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1033                 }
1034             }
1035         }
1036     }
1037
1038     avio_seek(s->pb, timeline_pos, SEEK_SET);
1039     return 0;
1040 }
1041
1042 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1043 {
1044     WtvContext *wtv = s->priv_data;
1045     AVIOContext *pb = wtv->pb;
1046     int stream_index, len, ret;
1047
1048     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1049     if (stream_index < 0)
1050         return stream_index;
1051
1052     ret = av_get_packet(pb, pkt, len - 32);
1053     if (ret < 0)
1054         return ret;
1055     pkt->stream_index = stream_index;
1056     pkt->pts          = wtv->pts;
1057     avio_skip(pb, WTV_PAD8(len) - len);
1058     return 0;
1059 }
1060
1061 static int read_seek(AVFormatContext *s, int stream_index,
1062                      int64_t ts, int flags)
1063 {
1064     WtvContext *wtv = s->priv_data;
1065     AVIOContext *pb = wtv->pb;
1066     AVStream *st = s->streams[0];
1067     int64_t ts_relative;
1068     int i;
1069
1070     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1071         return AVERROR(ENOSYS);
1072
1073     /* timestamp adjustment is required because wtv->pts values are absolute,
1074      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1075     ts_relative = ts;
1076     if (wtv->epoch != AV_NOPTS_VALUE)
1077         ts_relative -= wtv->epoch;
1078
1079     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1080     if (i < 0) {
1081         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1082             avio_seek(pb, 0, SEEK_SET);
1083         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1084             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1085         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1086             return AVERROR(ERANGE);
1087         return 0;
1088     }
1089     wtv->pts = wtv->index_entries[i].timestamp;
1090     if (wtv->epoch != AV_NOPTS_VALUE)
1091         wtv->pts += wtv->epoch;
1092     wtv->last_valid_pts = wtv->pts;
1093     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1094     return 0;
1095 }
1096
1097 static int read_close(AVFormatContext *s)
1098 {
1099     WtvContext *wtv = s->priv_data;
1100     av_free(wtv->index_entries);
1101     wtvfile_close(wtv->pb);
1102     return 0;
1103 }
1104
1105 AVInputFormat ff_wtv_demuxer = {
1106     .name           = "wtv",
1107     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1108     .priv_data_size = sizeof(WtvContext),
1109     .read_probe     = read_probe,
1110     .read_header    = read_header,
1111     .read_packet    = read_packet,
1112     .read_seek      = read_seek,
1113     .read_close     = read_close,
1114     .flags          = AVFMT_SHOW_IDS,
1115 };