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   1 /*
   2  * Windows Television (WTV) demuxer
   3  * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Windows Television (WTV) demuxer
  25  * @author Peter Ross <pross@xvid.org>
  26  */
  27
  28 #include "libavutil/intreadwrite.h"
  29 #include "libavutil/intfloat.h"
  30 #include "libavutil/dict.h"
  31 #include "avformat.h"
  32 #include "internal.h"
  33 #include "riff.h"
  34 #include "asf.h"
  35 #include "mpegts.h"
  36
  37 /* Macros for formating GUIDs */
  38 #define PRI_GUID \
  39     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
  40 #define ARG_GUID(g) \
  41     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]
  42
  43 #define PRI_PRETTY_GUID \
  44     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
  45 #define ARG_PRETTY_GUID(g) \
  46     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]
  47 #define LEN_PRETTY_GUID 34
  48
  49 /*
  50  *
  51  * File system routines
  52  *
  53  */
  54
  55 #define WTV_SECTOR_BITS    12
  56 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
  57 #define WTV_BIGSECTOR_BITS 18
  58
  59 typedef struct {
  60     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
  61
  62     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
  63     uint32_t *sectors;   /** file allocation table */
  64     int nb_sectors;      /** number of sectors */
  65
  66     int error;
  67     int64_t position;
  68     int64_t length;
  69 } WtvFile;
  70
  71 /**
  72  * @return bytes read, 0 on end of file, or <0 on error
  73  */
  74 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
  75 {
  76     WtvFile *wf = opaque;
  77     AVIOContext *pb = wf->pb_filesystem;
  78     int nread = 0;
  79
  80     if (wf->error || pb->error)
  81         return -1;
  82     if (wf->position >= wf->length || pb->eof_reached)
  83         return 0;
  84
  85     buf_size = FFMIN(buf_size, wf->length - wf->position);
  86     while(nread < buf_size) {
  87         int n;
  88         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
  89         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
  90
  91         n = avio_read(pb, buf, read_request);
  92         if (n <= 0)
  93             break;
  94         nread += n;
  95         buf += n;
  96         wf->position += n;
  97         if (n == remaining_in_sector) {
  98             int i = wf->position >> wf->sector_bits;
  99             if (i >= wf->nb_sectors ||
 100                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
 101                 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
 102                 wf->error = 1;
 103                 break;
 104             }
 105         }
 106     }
 107     return nread;
 108 }
 109
 110 /**
 111  * @return position (or file length)
 112  */
 113 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
 114 {
 115     WtvFile *wf = opaque;
 116     AVIOContext *pb = wf->pb_filesystem;
 117
 118     if (whence == AVSEEK_SIZE)
 119         return wf->length;
 120     else if (whence == SEEK_CUR)
 121         offset = wf->position + offset;
 122     else if (whence == SEEK_END)
 123         offset = wf->length;
 124
 125     wf->error = offset < 0 || offset >= wf->length ||
 126                 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
 127                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
 128     wf->position = offset;
 129     return offset;
 130 }
 131
 132 /**
 133  * read non-zero integers (le32) from input stream
 134  * @param pb
 135  * @param[out] data destination
 136  * @param     count maximum number of integers to read
 137  * @return    total number of integers read
 138  */
 139 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
 140 {
 141     int i, total = 0;
 142     for (i = 0; i < count; i++) {
 143         if ((data[total] = avio_rl32(pb)))
 144            total++;
 145     }
 146     return total;
 147 }
 148
 149 /**
 150  * Open file
 151  * @param first_sector  First sector
 152  * @param length        Length of file (bytes)
 153  * @param depth         File allocation table depth
 154  * @return NULL on error
 155  */
 156 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
 157 {
 158     AVIOContext *pb;
 159     WtvFile *wf;
 160     uint8_t *buffer;
 161
 162     if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
 163         return NULL;
 164
 165     wf = av_mallocz(sizeof(WtvFile));
 166     if (!wf)
 167         return NULL;
 168
 169     if (depth == 0) {
 170         wf->sectors = av_malloc(sizeof(uint32_t));
 171         if (!wf->sectors) {
 172             av_free(wf);
 173             return NULL;
 174         }
 175         wf->sectors[0]  = first_sector;
 176         wf->nb_sectors  = 1;
 177         wf->sector_bits = WTV_SECTOR_BITS;
 178     } else if (depth == 1) {
 179         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
 180         if (!wf->sectors) {
 181             av_free(wf);
 182             return NULL;
 183         }
 184         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
 185         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 186     } else if (depth == 2) {
 187         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
 188         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
 189         int i;
 190
 191         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
 192         if (!wf->sectors) {
 193             av_free(wf);
 194             return NULL;
 195         }
 196         wf->nb_sectors = 0;
 197         for (i = 0; i < nb_sectors1; i++) {
 198             if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
 199                 break;
 200             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
 201         }
 202         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 203     } else {
 204         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 205         av_free(wf);
 206         return NULL;
 207     }
 208
 209     if (!wf->nb_sectors) {
 210         av_free(wf->sectors);
 211         av_free(wf);
 212         return NULL;
 213     }
 214
 215     /* check length */
 216     length &= 0xFFFFFFFFFFFF;
 217     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
 218         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);
 219         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
 220     }
 221     wf->length = length;
 222
 223     /* seek to intial sector */
 224     wf->position = 0;
 225     if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
 226         av_free(wf->sectors);
 227         av_free(wf);
 228         return NULL;
 229     }
 230
 231     wf->pb_filesystem = s->pb;
 232     buffer = av_malloc(1 << wf->sector_bits);
 233     if (!buffer) {
 234         av_free(wf->sectors);
 235         av_free(wf);
 236         return NULL;
 237     }
 238
 239     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
 240                            wtvfile_read_packet, NULL, wtvfile_seek);
 241     if (!pb) {
 242         av_free(buffer);
 243         av_free(wf->sectors);
 244         av_free(wf);
 245     }
 246     return pb;
 247 }
 248
 249 static const ff_asf_guid dir_entry_guid =
 250     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
 251
 252 /**
 253  * Open file using filename
 254  * @param[in]  buf       directory buffer
 255  * @param      buf_size  directory buffer size
 256  * @param[in]  filename
 257  * @param      filename_size size of filename
 258  * @return NULL on error
 259  */
 260 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
 261 {
 262     const uint8_t *buf_end = buf + buf_size;
 263
 264     while(buf + 48 <= buf_end) {
 265         int dir_length, name_size, first_sector, depth;
 266         uint64_t file_length;
 267         const uint8_t *name;
 268         if (ff_guidcmp(buf, dir_entry_guid)) {
 269             av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
 270                    "remaining directory entries ignored\n", ARG_GUID(buf));
 271             break;
 272         }
 273         dir_length  = AV_RL16(buf + 16);
 274         file_length = AV_RL64(buf + 24);
 275         name_size   = 2 * AV_RL32(buf + 32);
 276         if (buf + 48 + name_size > buf_end) {
 277             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
 278             break;
 279         }
 280         first_sector = AV_RL32(buf + 40 + name_size);
 281         depth        = AV_RL32(buf + 44 + name_size);
 282
 283         /* compare file name; test optional null terminator */
 284         name = buf + 40;
 285         if (name_size >= filename_size &&
 286             !memcmp(name, filename, filename_size) &&
 287             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
 288             return wtvfile_open_sector(first_sector, file_length, depth, s);
 289
 290         buf += dir_length;
 291     }
 292     return 0;
 293 }
 294
 295 #define wtvfile_open(s, buf, buf_size, filename) \
 296     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
 297
 298 /**
 299  * Close file opened with wtvfile_open_sector(), or wtv_open()
 300  */
 301 static void wtvfile_close(AVIOContext *pb)
 302 {
 303     WtvFile *wf = pb->opaque;
 304     av_free(wf->sectors);
 305     av_free(wf);
 306     av_free(pb->buffer);
 307     av_free(pb);
 308 }
 309
 310 /*
 311  *
 312  * Main demuxer
 313  *
 314  */
 315
 316 typedef struct {
 317     int seen_data;
 318 } WtvStream;
 319
 320 typedef struct {
 321     AVIOContext *pb;       /** timeline file */
 322     int64_t epoch;
 323     int64_t pts;             /** pts for next data chunk */
 324     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
 325
 326     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
 327        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
 328     AVIndexEntry *index_entries;
 329     int nb_index_entries;
 330     unsigned int index_entries_allocated_size;
 331 } WtvContext;
 332
 333 typedef struct {
 334     enum CodecID id;
 335     ff_asf_guid guid;
 336 } AVCodecGuid;
 337
 338 static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
 339 {
 340     int i;
 341     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
 342         if (!ff_guidcmp(guids[i].guid, guid))
 343             return guids[i].id;
 344     }
 345     return CODEC_ID_NONE;
 346 }
 347
 348 /* WTV GUIDs */
 349 static const ff_asf_guid wtv_guid =
 350     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 351 static const ff_asf_guid metadata_guid =
 352     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
 353 static const ff_asf_guid timestamp_guid =
 354     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
 355 static const ff_asf_guid data_guid =
 356     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 357 static const ff_asf_guid stream_guid =
 358     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
 359 static const ff_asf_guid stream2_guid =
 360     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
 361 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
 362     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
 363 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
 364     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
 365 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
 366     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
 367 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
 368     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
 369 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
 370     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
 371 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
 372     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
 373 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
 374     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
 375 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
 376     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
 377 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
 378     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
 379
 380 /* Windows media GUIDs */
 381
 382 #define MEDIASUBTYPE_BASE_GUID \
 383     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
 384
 385 /* Media types */
 386 static const ff_asf_guid mediatype_audio =
 387     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
 388 static const ff_asf_guid mediatype_video =
 389     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
 390 static const ff_asf_guid mediasubtype_mpeg1payload =
 391     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 392 static const ff_asf_guid mediatype_mpeg2_sections =
 393     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 394 static const ff_asf_guid mediatype_mpeg2_pes =
 395     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 396 static const ff_asf_guid mediatype_mstvcaption =
 397     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 398
 399 /* Media subtypes */
 400 static const ff_asf_guid mediasubtype_cpfilters_processed =
 401     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 402 static const ff_asf_guid mediasubtype_dvb_subtitle =
 403     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 404 static const ff_asf_guid mediasubtype_teletext =
 405     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 406 static const ff_asf_guid mediasubtype_dtvccdata =
 407     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 408 static const ff_asf_guid mediasubtype_mpeg2_sections =
 409     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 410
 411 /* Formats */
 412 static const ff_asf_guid format_cpfilters_processed =
 413     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 414 static const ff_asf_guid format_waveformatex =
 415     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 416 static const ff_asf_guid format_videoinfo2 =
 417     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 418 static const ff_asf_guid format_mpeg2_video =
 419     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 420 static const ff_asf_guid format_none =
 421     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 422
 423 static const AVCodecGuid video_guids[] = {
 424     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 425     {CODEC_ID_NONE}
 426 };
 427
 428 static const AVCodecGuid audio_guids[] = {
 429     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 430     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
 431     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 432     {CODEC_ID_NONE}
 433 };
 434
 435 static int read_probe(AVProbeData *p)
 436 {
 437     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 438 }
 439
 440 /**
 441  * Convert win32 FILETIME to ISO-8601 string
 442  */
 443 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
 444 {
 445     time_t t = (value / 10000000LL) - 11644473600LL;
 446     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 447 }
 448
 449 /**
 450  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
 451  */
 452 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
 453 {
 454     time_t t = (value / 10000000LL) - 719162LL*86400LL;
 455     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 456 }
 457
 458 /**
 459  * Convert OLE DATE to ISO-8601 string
 460  */
 461 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
 462 {
 463     time_t t = 631112400LL + 86400*av_int2double(value);
 464     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
 465 }
 466
 467 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
 468 {
 469     char mime[1024];
 470     char description[1024];
 471     unsigned int filesize;
 472     AVStream *st;
 473     int64_t pos = avio_tell(pb);
 474
 475     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
 476     if (strcmp(mime, "image/jpeg"))
 477         goto done;
 478
 479     avio_r8(pb);
 480     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
 481     filesize = avio_rl32(pb);
 482     if (!filesize)
 483         goto done;
 484
 485     st = avformat_new_stream(s, NULL);
 486     if (!st)
 487         goto done;
 488     av_dict_set(&st->metadata, "title", description, 0);
 489     st->codec->codec_id   = CODEC_ID_MJPEG;
 490     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
 491     st->codec->extradata  = av_mallocz(filesize);
 492     if (!st->codec->extradata)
 493         goto done;
 494     st->codec->extradata_size = filesize;
 495     avio_read(pb, st->codec->extradata, filesize);
 496 done:
 497     avio_seek(pb, pos + length, SEEK_SET);
 498 }
 499
 500 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
 501 {
 502     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
 503     char *buf = av_malloc(buf_size);
 504     if (!buf)
 505         return;
 506
 507     if (type == 0 && length == 4) {
 508         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
 509     } else if (type == 1) {
 510         avio_get_str16le(pb, length, buf, buf_size);
 511         if (!strlen(buf)) {
 512            av_free(buf);
 513            return;
 514         }
 515     } else if (type == 3 && length == 4) {
 516         strcpy(buf, avio_rl32(pb) ? "true" : "false");
 517     } else if (type == 4 && length == 8) {
 518         int64_t num = avio_rl64(pb);
 519         if (!strcmp(key, "WM/EncodingTime") ||
 520             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
 521             filetime_to_iso8601(buf, buf_size, num);
 522         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
 523                  !strcmp(key, "WM/WMRVEndTime"))
 524             crazytime_to_iso8601(buf, buf_size, num);
 525         else if (!strcmp(key, "WM/WMRVExpirationDate"))
 526             oledate_to_iso8601(buf, buf_size, num);
 527         else if (!strcmp(key, "WM/WMRVBitrate"))
 528             snprintf(buf, buf_size, "%f", av_int2double(num));
 529         else
 530             snprintf(buf, buf_size, "%"PRIi64, num);
 531     } else if (type == 5 && length == 2) {
 532         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
 533     } else if (type == 6 && length == 16) {
 534         ff_asf_guid guid;
 535         avio_read(pb, guid, 16);
 536         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
 537     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
 538         get_attachment(s, pb, length);
 539         av_freep(&buf);
 540         return;
 541     } else {
 542         av_freep(&buf);
 543         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
 544         avio_skip(pb, length);
 545         return;
 546     }
 547
 548     av_dict_set(&s->metadata, key, buf, 0);
 549     av_freep(&buf);
 550 }
 551
 552 /**
 553  * Parse metadata entries
 554  */
 555 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
 556 {
 557     ff_asf_guid guid;
 558     int length, type;
 559     while(!pb->eof_reached) {
 560         char key[1024];
 561         ff_get_guid(pb, &guid);
 562         type   = avio_rl32(pb);
 563         length = avio_rl32(pb);
 564         if (!length)
 565             break;
 566         if (ff_guidcmp(&guid, metadata_guid)) {
 567             av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
 568                    "remaining metadata entries ignored\n", ARG_GUID(guid));
 569             break;
 570         }
 571         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
 572         get_tag(s, pb, key, type, length);
 573     }
 574
 575     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
 576 }
 577
 578 /**
 579  * parse VIDEOINFOHEADER2 structure
 580  * @return bytes consumed
 581  */
 582 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 583 {
 584     WtvContext *wtv = s->priv_data;
 585     AVIOContext *pb = wtv->pb;
 586
 587     avio_skip(pb, 72);  // picture aspect ratio is unreliable
 588     ff_get_bmp_header(pb, st);
 589
 590     return 72 + 40;
 591 }
 592
 593 /**
 594  * Parse MPEG1WAVEFORMATEX extradata structure
 595  */
 596 static void parse_mpeg1waveformatex(AVStream *st)
 597 {
 598     /* fwHeadLayer */
 599     switch (AV_RL16(st->codec->extradata)) {
 600     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
 601     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
 602     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
 603     }
 604
 605     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
 606
 607     /* dwHeadMode */
 608     switch (AV_RL16(st->codec->extradata + 6)) {
 609     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
 610     case 8 :                   st->codec->channels = 1; break;
 611     }
 612 }
 613
 614 /**
 615  * Initialise stream
 616  * @param st Stream to initialise, or NULL to create and initialise new stream
 617  * @return NULL on error
 618  */
 619 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
 620 {
 621     if (st) {
 622         if (st->codec->extradata) {
 623             av_freep(&st->codec->extradata);
 624             st->codec->extradata_size = 0;
 625         }
 626     } else {
 627         WtvStream *wst = av_mallocz(sizeof(WtvStream));
 628         if (!wst)
 629             return NULL;
 630         st = avformat_new_stream(s, NULL);
 631         if (!st)
 632             return NULL;
 633         st->id = sid;
 634         st->priv_data = wst;
 635     }
 636     st->codec->codec_type = codec_type;
 637     st->need_parsing      = AVSTREAM_PARSE_FULL;
 638     avpriv_set_pts_info(st, 64, 1, 10000000);
 639     return st;
 640 }
 641
 642 /**
 643  * parse Media Type structure and populate stream
 644  * @param st         Stream, or NULL to create new stream
 645  * @param mediatype  Mediatype GUID
 646  * @param subtype    Subtype GUID
 647  * @param formattype Format GUID
 648  * @param size       Size of format buffer
 649  * @return NULL on error
 650  */
 651 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
 652                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 653                                    ff_asf_guid formattype, int size)
 654 {
 655     WtvContext *wtv = s->priv_data;
 656     AVIOContext *pb = wtv->pb;
 657     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 658         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 659         ff_asf_guid actual_subtype;
 660         ff_asf_guid actual_formattype;
 661
 662         if (size < 32) {
 663             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 664             avio_skip(pb, size);
 665             return NULL;
 666         }
 667
 668         avio_skip(pb, size - 32);
 669         ff_get_guid(pb, &actual_subtype);
 670         ff_get_guid(pb, &actual_formattype);
 671         avio_seek(pb, -size, SEEK_CUR);
 672
 673         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 674         avio_skip(pb, 32);
 675         return st;
 676     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 677         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
 678         if (!st)
 679             return NULL;
 680         if (!ff_guidcmp(formattype, format_waveformatex)) {
 681             int ret = ff_get_wav_header(pb, st->codec, size);
 682             if (ret < 0)
 683                 return NULL;
 684         } else {
 685             if (ff_guidcmp(formattype, format_none))
 686                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 687             avio_skip(pb, size);
 688         }
 689
 690         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
 691             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
 692         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 693             if (st->codec->extradata && st->codec->extradata_size >= 22)
 694                 parse_mpeg1waveformatex(st);
 695             else
 696                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 697         } else {
 698             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
 699             if (st->codec->codec_id == CODEC_ID_NONE)
 700                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
 701         }
 702         return st;
 703     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 704         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
 705         if (!st)
 706             return NULL;
 707         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 708             int consumed = parse_videoinfoheader2(s, st);
 709             avio_skip(pb, FFMAX(size - consumed, 0));
 710         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 711             int consumed = parse_videoinfoheader2(s, st);
 712             avio_skip(pb, FFMAX(size - consumed, 0));
 713         } else {
 714             if (ff_guidcmp(formattype, format_none))
 715                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 716             avio_skip(pb, size);
 717         }
 718
 719         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
 720             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 721         } else {
 722             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 723         }
 724         if (st->codec->codec_id == CODEC_ID_NONE)
 725             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
 726         return st;
 727     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 728                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 729         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 730         if (!st)
 731             return NULL;
 732         if (ff_guidcmp(formattype, format_none))
 733             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 734         avio_skip(pb, size);
 735         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
 736         return st;
 737     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 738                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 739         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
 740         if (!st)
 741             return NULL;
 742         if (ff_guidcmp(formattype, format_none))
 743             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 744         avio_skip(pb, size);
 745         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
 746         return st;
 747     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 748                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 749         if (ff_guidcmp(formattype, format_none))
 750             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 751         avio_skip(pb, size);
 752         return NULL;
 753     }
 754
 755     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
 756                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
 757                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
 758     avio_skip(pb, size);
 759     return NULL;
 760 }
 761
 762 enum {
 763     SEEK_TO_DATA = 0,
 764     SEEK_TO_PTS,
 765 };
 766
 767 /**
 768  * Parse WTV chunks
 769  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
 770  * @param seekts timestamp
 771  * @param[out] len_ptr Length of data chunk
 772  * @return stream index of data chunk, or <0 on error
 773  */
 774 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 775 {
 776     WtvContext *wtv = s->priv_data;
 777     AVIOContext *pb = wtv->pb;
 778     while (!pb->eof_reached) {
 779         ff_asf_guid g;
 780         int len, sid, consumed;
 781
 782         ff_get_guid(pb, &g);
 783         len = avio_rl32(pb);
 784         if (len < 32)
 785             break;
 786         sid = avio_rl32(pb) & 0x7FFF;
 787         avio_skip(pb, 8);
 788         consumed = 32;
 789
 790         if (!ff_guidcmp(g, stream_guid)) {
 791             if (ff_find_stream_index(s, sid) < 0) {
 792                 ff_asf_guid mediatype, subtype, formattype;
 793                 int size;
 794                 avio_skip(pb, 28);
 795                 ff_get_guid(pb, &mediatype);
 796                 ff_get_guid(pb, &subtype);
 797                 avio_skip(pb, 12);
 798                 ff_get_guid(pb, &formattype);
 799                 size = avio_rl32(pb);
 800                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
 801                 consumed += 92 + size;
 802             }
 803         } else if (!ff_guidcmp(g, stream2_guid)) {
 804             int stream_index = ff_find_stream_index(s, sid);
 805             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
 806                 ff_asf_guid mediatype, subtype, formattype;
 807                 int size;
 808                 avio_skip(pb, 12);
 809                 ff_get_guid(pb, &mediatype);
 810                 ff_get_guid(pb, &subtype);
 811                 avio_skip(pb, 12);
 812                 ff_get_guid(pb, &formattype);
 813                 size = avio_rl32(pb);
 814                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
 815                 consumed += 76 + size;
 816             }
 817         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 818                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 819                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 820                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 821                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 822                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 823             int stream_index = ff_find_stream_index(s, sid);
 824             if (stream_index >= 0) {
 825                 AVStream *st = s->streams[stream_index];
 826                 uint8_t buf[258];
 827                 const uint8_t *pbuf = buf;
 828                 int buf_size;
 829
 830                 avio_skip(pb, 8);
 831                 consumed += 8;
 832                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 833                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 834                     avio_skip(pb, 6);
 835                     consumed += 6;
 836                 }
 837
 838                 buf_size = FFMIN(len - consumed, sizeof(buf));
 839                 avio_read(pb, buf, buf_size);
 840                 consumed += buf_size;
 841                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
 842             }
 843         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
 844             int stream_index = ff_find_stream_index(s, sid);
 845             if (stream_index >= 0) {
 846                 AVStream *st = s->streams[stream_index];
 847                 int audio_type;
 848                 avio_skip(pb, 8);
 849                 audio_type = avio_r8(pb);
 850                 if (audio_type == 2)
 851                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
 852                 else if (audio_type == 3)
 853                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 854                 consumed += 9;
 855             }
 856         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 857             int stream_index = ff_find_stream_index(s, sid);
 858             if (stream_index >= 0) {
 859                 avio_skip(pb, 12);
 860                 if (avio_rl32(pb))
 861                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 862                 consumed += 16;
 863             }
 864         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 865             int stream_index = ff_find_stream_index(s, sid);
 866             if (stream_index >= 0) {
 867                 AVStream *st = s->streams[stream_index];
 868                 uint8_t language[4];
 869                 avio_skip(pb, 12);
 870                 avio_read(pb, language, 3);
 871                 if (language[0]) {
 872                     language[3] = 0;
 873                     av_dict_set(&st->metadata, "language", language, 0);
 874                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
 875                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
 876                 }
 877                 consumed += 15;
 878             }
 879         } else if (!ff_guidcmp(g, timestamp_guid)) {
 880             int stream_index = ff_find_stream_index(s, sid);
 881             if (stream_index >= 0) {
 882                 avio_skip(pb, 8);
 883                 wtv->pts = avio_rl64(pb);
 884                 consumed += 16;
 885                 if (wtv->pts == -1)
 886                     wtv->pts = AV_NOPTS_VALUE;
 887                 else {
 888                     wtv->last_valid_pts = wtv->pts;
 889                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
 890                         wtv->epoch = wtv->pts;
 891                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 892 #define WTV_PAD8(x) (((x) + 7) & ~7)
 893                     avio_skip(pb, WTV_PAD8(len) - consumed);
 894                     return 0;
 895                 }
 896                 }
 897             }
 898         } else if (!ff_guidcmp(g, data_guid)) {
 899             int stream_index = ff_find_stream_index(s, sid);
 900             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
 901                 WtvStream *wst = s->streams[stream_index]->priv_data;
 902                 wst->seen_data = 1;
 903                 if (len_ptr) {
 904                     *len_ptr = len;
 905                 }
 906                 return stream_index;
 907             }
 908         } else if (
 909             !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}) ||
 910             !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}) ||
 911             !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}) ||
 912             !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}) ||
 913             !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}) ||
 914             !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}) ||
 915             !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}) ||
 916             !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}) ||
 917             !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}) ||
 918             !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}) ||
 919             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 920             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 921             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 922             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 923             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 924             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 925             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 926             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 927             //ignore known guids
 928         } else
 929             av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
 930
 931         avio_skip(pb, WTV_PAD8(len) - consumed);
 932     }
 933     return AVERROR_EOF;
 934 }
 935
 936 /* declare utf16le strings */
 937 #define _ , 0,
 938 static const uint8_t timeline_le16[] =
 939     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
 940 static const uint8_t table_0_entries_legacy_attrib_le16[] =
 941     {'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};
 942 static const uint8_t table_0_entries_time_le16[] =
 943     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
 944 static const uint8_t timeline_table_0_entries_Events_le16[] =
 945     {'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};
 946 #undef _
 947
 948 static int read_header(AVFormatContext *s)
 949 {
 950     WtvContext *wtv = s->priv_data;
 951     int root_sector, root_size;
 952     uint8_t root[WTV_SECTOR_SIZE];
 953     AVIOContext *pb;
 954     int64_t timeline_pos;
 955     int ret;
 956
 957     wtv->epoch          =
 958     wtv->pts            =
 959     wtv->last_valid_pts = AV_NOPTS_VALUE;
 960
 961     /* read root directory sector */
 962     avio_skip(s->pb, 0x30);
 963     root_size = avio_rl32(s->pb);
 964     if (root_size > sizeof(root)) {
 965         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
 966         return AVERROR_INVALIDDATA;
 967     }
 968     avio_skip(s->pb, 4);
 969     root_sector = avio_rl32(s->pb);
 970
 971     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
 972     root_size = avio_read(s->pb, root, root_size);
 973     if (root_size < 0)
 974         return AVERROR_INVALIDDATA;
 975
 976     /* parse chunks up until first data chunk */
 977     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
 978     if (!wtv->pb) {
 979         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
 980         return AVERROR_INVALIDDATA;
 981     }
 982
 983     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 984     if (ret < 0)
 985         return ret;
 986     avio_seek(wtv->pb, -32, SEEK_CUR);
 987
 988     timeline_pos = avio_tell(s->pb); // save before opening another file
 989
 990     /* read metadata */
 991     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
 992     if (pb) {
 993         parse_legacy_attrib(s, pb);
 994         wtvfile_close(pb);
 995     }
 996
 997     /* read seek index */
 998     if (s->nb_streams) {
 999         AVStream *st = s->streams[0];
1000         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
1001         if (pb) {
1002             while(1) {
1003                 uint64_t timestamp = avio_rl64(pb);
1004                 uint64_t frame_nb  = avio_rl64(pb);
1005                 if (pb->eof_reached)
1006                     break;
1007                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1008                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1009             }
1010             wtvfile_close(pb);
1011
1012             if (wtv->nb_index_entries) {
1013                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
1014                 if (pb) {
1015                     int i;
1016                     while (1) {
1017                         uint64_t frame_nb = avio_rl64(pb);
1018                         uint64_t position = avio_rl64(pb);
1019                         if (pb->eof_reached)
1020                             break;
1021                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1022                             AVIndexEntry *e = wtv->index_entries + i;
1023                             if (frame_nb > e->size)
1024                                 break;
1025                             if (position > e->pos)
1026                                 e->pos = position;
1027                         }
1028                     }
1029                     wtvfile_close(pb);
1030                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1031                 }
1032             }
1033         }
1034     }
1035
1036     avio_seek(s->pb, timeline_pos, SEEK_SET);
1037     return 0;
1038 }
1039
1040 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1041 {
1042     WtvContext *wtv = s->priv_data;
1043     AVIOContext *pb = wtv->pb;
1044     int stream_index, len, ret;
1045
1046     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1047     if (stream_index < 0)
1048         return stream_index;
1049
1050     ret = av_get_packet(pb, pkt, len - 32);
1051     if (ret < 0)
1052         return ret;
1053     pkt->stream_index = stream_index;
1054     pkt->pts          = wtv->pts;
1055     avio_skip(pb, WTV_PAD8(len) - len);
1056     return 0;
1057 }
1058
1059 static int read_seek(AVFormatContext *s, int stream_index,
1060                      int64_t ts, int flags)
1061 {
1062     WtvContext *wtv = s->priv_data;
1063     AVIOContext *pb = wtv->pb;
1064     AVStream *st = s->streams[0];
1065     int64_t ts_relative;
1066     int i;
1067
1068     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1069         return AVERROR(ENOSYS);
1070
1071     /* timestamp adjustment is required because wtv->pts values are absolute,
1072      * whereas AVIndexEntry->timestamp values are relative to epoch. */
1073     ts_relative = ts;
1074     if (wtv->epoch != AV_NOPTS_VALUE)
1075         ts_relative -= wtv->epoch;
1076
1077     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1078     if (i < 0) {
1079         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
1080             avio_seek(pb, 0, SEEK_SET);
1081         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
1082             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
1083         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1084             return AVERROR(ERANGE);
1085         return 0;
1086     }
1087     wtv->pts = wtv->index_entries[i].timestamp;
1088     if (wtv->epoch != AV_NOPTS_VALUE)
1089         wtv->pts += wtv->epoch;
1090     wtv->last_valid_pts = wtv->pts;
1091     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
1092     return 0;
1093 }
1094
1095 static int read_close(AVFormatContext *s)
1096 {
1097     WtvContext *wtv = s->priv_data;
1098     av_free(wtv->index_entries);
1099     wtvfile_close(wtv->pb);
1100     return 0;
1101 }
1102
1103 AVInputFormat ff_wtv_demuxer = {
1104     .name           = "wtv",
1105     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1106     .priv_data_size = sizeof(WtvContext),
1107     .read_probe     = read_probe,
1108     .read_header    = read_header,
1109     .read_packet    = read_packet,
1110     .read_seek      = read_seek,
1111     .read_close     = read_close,
1112     .flags          = AVFMT_SHOW_IDS,
1113 };