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FFmpeg/libavformat/wtv.c

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  1. /*

  2.  * Windows Television (WTV) demuxer

  3.  * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * Windows Television (WTV) demuxer

  25.  * @author Peter Ross <pross@xvid.org>

  26.  */

  27. 

  28. #include "libavutil/intreadwrite.h"

  29. #include "libavutil/intfloat_readwrite.h"

  30. #include "avformat.h"

  31. #include "internal.h"

  32. #include "riff.h"

  33. #include "asf.h"

  34. #include "mpegts.h"

  35. 

  36. /* Macros for formating GUIDs */

  37. #define PRI_GUID \

  38.     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"

  39. #define ARG_GUID(g) \

  40.     g[0],g[1],g[2],g[3],g[4],g[5],g[6],g[7],g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]

  41. 

  42. #define PRI_PRETTY_GUID \

  43.     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"

  44. #define ARG_PRETTY_GUID(g) \

  45.     AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]

  46. #define LEN_PRETTY_GUID 34

  47. 

  48. /*

  49.  *

  50.  * File system routines

  51.  *

  52.  */

  53. 

  54. #define WTV_SECTOR_BITS    12

  55. #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)

  56. #define WTV_BIGSECTOR_BITS 18

  57. 

  58. typedef struct {

  59.     ByteIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */

  60. 

  61.     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */

  62.     uint32_t *sectors;   /** file allocation table */

  63.     int nb_sectors;      /** number of sectors */

  64. 

  65.     int error;

  66.     int64_t position;

  67.     int64_t length;

  68. } WtvFile;

  69. 

  70. /**

  71.  * @return bytes read, 0 on end of file, or <0 on error

  72.  */

  73. static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)

  74. {

  75.     WtvFile *wf = opaque;

  76.     ByteIOContext *pb = wf->pb_filesystem;

  77.     int nread = 0;

  78. 

  79.     if (wf->error || url_ferror(pb))

  80.         return -1;

  81.     if (wf->position >= wf->length || url_feof(pb))

  82.         return 0;

  83. 

  84.     buf_size = FFMIN(buf_size, wf->length - wf->position);

  85.     while(nread < buf_size) {

  86.         int n;

  87.         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));

  88.         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);

  89. 

  90.         n = get_buffer(pb, buf, read_request);

  91.         if (n <= 0)

  92.             break;

  93.         nread += n;

  94.         buf += n;

  95.         wf->position += n;

  96.         if (n == remaining_in_sector) {

  97.             int i = wf->position >> wf->sector_bits;

  98.             if (i >= wf->nb_sectors ||

  99.                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&

  100.                 url_fseek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {

  101.                 wf->error = 1;

  102.                 break;

  103.             }

  104.         }

  105.     }

  106.     return nread;

  107. }

  108. 

  109. /**

  110.  * @return position (or file length)

  111.  */

  112. static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)

  113. {

  114.     WtvFile *wf = opaque;

  115.     ByteIOContext *pb = wf->pb_filesystem;

  116. 

  117.     if (whence == AVSEEK_SIZE)

  118.         return wf->length;

  119.     else if (whence == SEEK_CUR)

  120.         offset = wf->position + offset;

  121.     else if (whence == SEEK_END)

  122.         offset = wf->length;

  123. 

  124.     wf->error = offset < 0 || offset >= wf->length ||

  125.                 url_fseek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)

  126.                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;

  127.     wf->position = offset;

  128.     return offset;

  129. }

  130. 

  131. /**

  132.  * read non-zero integers (le32) from input stream

  133.  * @param pb

  134.  * @param[out] data destination

  135.  * @param     count maximum number of integers to read

  136.  * @return    total number of integers read

  137.  */

  138. static int read_ints(ByteIOContext *pb, uint32_t *data, int count)

  139. {

  140.     int i, total = 0;

  141.     for (i = 0; i < count; i++) {

  142.         if ((data[total] = get_le32(pb)))

  143.            total++;

  144.     }

  145.     return total;

  146. }

  147. 

  148. /**

  149.  * Open file

  150.  * @param first_sector  First sector

  151.  * @param length        Length of file (bytes)

  152.  * @param depth         File allocation table depth

  153.  * @return NULL on error

  154.  */

  155. static ByteIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)

  156. {

  157.     ByteIOContext *pb;

  158.     WtvFile *wf;

  159.     uint8_t *buffer;

  160. 

  161.     if (url_fseek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)

  162.         return NULL;

  163. 

  164.     wf = av_mallocz(sizeof(WtvFile));

  165.     if (!wf)

  166.         return NULL;

  167. 

  168.     if (depth == 0) {

  169.         wf->sectors = av_malloc(sizeof(uint32_t));

  170.         if (!wf->sectors) {

  171.             av_free(wf);

  172.             return NULL;

  173.         }

  174.         wf->sectors[0]  = first_sector;

  175.         wf->nb_sectors  = 1;

  176.         wf->sector_bits = WTV_SECTOR_BITS;

  177.     } else if (depth == 1) {

  178.         wf->sectors = av_malloc(WTV_SECTOR_SIZE);

  179.         if (!wf->sectors) {

  180.             av_free(wf);

  181.             return NULL;

  182.         }

  183.         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);

  184.         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;

  185.     } else if (depth == 2) {

  186.         uint32_t sectors1[WTV_SECTOR_SIZE / 4];

  187.         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);

  188.         int i;

  189. 

  190.         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);

  191.         if (!wf->sectors) {

  192.             av_free(wf);

  193.             return NULL;

  194.         }

  195.         wf->nb_sectors = 0;

  196.         for (i = 0; i < nb_sectors1; i++) {

  197.             if (url_fseek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)

  198.                 break;

  199.             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);

  200.         }

  201.         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;

  202.     } else {

  203.         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);

  204.         av_free(wf);

  205.         return NULL;

  206.     }

  207. 

  208.     if (!wf->nb_sectors) {

  209.         av_free(wf->sectors);

  210.         av_free(wf);

  211.         return NULL;

  212.     }

  213. 

  214.     /* check length */

  215.     length &= 0xFFFFFFFFFFFF;

  216.     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {

  217.         av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);

  218.         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;

  219.     }

  220.     wf->length = length;

  221. 

  222.     /* seek to intial sector */

  223.     wf->position = 0;

  224.     if (url_fseek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {

  225.         av_free(wf->sectors);

  226.         av_free(wf);

  227.         return NULL;

  228.     }

  229. 

  230.     wf->pb_filesystem = s->pb;

  231.     buffer = av_malloc(1 << wf->sector_bits);

  232.     if (!buffer) {

  233.         av_free(wf->sectors);

  234.         av_free(wf);

  235.         return NULL;

  236.     }

  237. 

  238.     pb = av_alloc_put_byte(buffer, 1 << wf->sector_bits, 0, wf,

  239.                            wtvfile_read_packet, NULL, wtvfile_seek);

  240.     if (!pb) {

  241.         av_free(buffer);

  242.         av_free(wf->sectors);

  243.         av_free(wf);

  244.     }

  245.     return pb;

  246. }

  247. 

  248. static const ff_asf_guid dir_entry_guid =

  249.     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};

  250. 

  251. /**

  252.  * Open file using filename

  253.  * @param[in]  buf       directory buffer

  254.  * @param      buf_size  directory buffer size

  255.  * @param[in]  filename

  256.  * @param      filename_size size of filename

  257.  * @return NULL on error

  258.  */

  259. static ByteIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)

  260. {

  261.     const uint8_t *buf_end = buf + buf_size;

  262. 

  263.     while(buf + 48 <= buf_end) {

  264.         int dir_length, name_size, first_sector, depth;

  265.         uint64_t file_length;

  266.         const uint8_t *name;

  267.         if (ff_guidcmp(buf, dir_entry_guid)) {

  268.             av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "

  269.                    "remaining directory entries ignored\n", ARG_GUID(buf));

  270.             break;

  271.         }

  272.         dir_length  = AV_RL16(buf + 16);

  273.         file_length = AV_RL64(buf + 24);

  274.         name_size   = 2 * AV_RL32(buf + 32);

  275.         if (buf + 48 + name_size > buf_end) {

  276.             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");

  277.             break;

  278.         }

  279.         first_sector = AV_RL32(buf + 40 + name_size);

  280.         depth        = AV_RL32(buf + 44 + name_size);

  281. 

  282.         /* compare file name; test optional null terminator */

  283.         name = buf + 40;

  284.         if (name_size >= filename_size &&

  285.             !memcmp(name, filename, filename_size) &&

  286.             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))

  287.             return wtvfile_open_sector(first_sector, file_length, depth, s);

  288. 

  289.         buf += dir_length;

  290.     }

  291.     return 0;

  292. }

  293. 

  294. #define wtvfile_open(s, buf, buf_size, filename) \

  295.     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))

  296. 

  297. /**

  298.  * Close file opened with wtvfile_open_sector(), or wtv_open()

  299.  */

  300. static void wtvfile_close(ByteIOContext *pb)

  301. {

  302.     WtvFile *wf = pb->opaque;

  303.     av_free(wf->sectors);

  304.     av_free(pb);

  305. }

  306. 

  307. /*

  308.  *

  309.  * Main demuxer

  310.  *

  311.  */

  312. 

  313. typedef struct {

  314.     int seen_data;

  315. } WtvStream;

  316. 

  317. typedef struct {

  318.     ByteIOContext *pb;       /** timeline file */

  319.     int64_t epoch;

  320.     int64_t pts;             /** pts for next data chunk */

  321.     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */

  322. 

  323.     /* maintain private seek index, as the AVIndexEntry->pos is relative to the

  324.        start of the 'timeline' file, not the file system (AVFormatContext->pb) */

  325.     AVIndexEntry *index_entries;

  326.     int nb_index_entries;

  327.     unsigned int index_entries_allocated_size;

  328. } WtvContext;

  329. 

  330. typedef struct {

  331.     enum CodecID id;

  332.     ff_asf_guid guid;

  333. } AVCodecGuid;

  334. 

  335. static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)

  336. {

  337.     int i;

  338.     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {

  339.         if (!ff_guidcmp(guids[i].guid, guid))

  340.             return guids[i].id;

  341.     }

  342.     return CODEC_ID_NONE;

  343. }

  344. 

  345. /* WTV GUIDs */

  346. static const ff_asf_guid wtv_guid =

  347.     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  348. static const ff_asf_guid metadata_guid =

  349.     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};

  350. static const ff_asf_guid timestamp_guid =

  351.     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};

  352. static const ff_asf_guid data_guid =

  353.     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  354. static const ff_asf_guid stream_guid =

  355.     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};

  356. static const ff_asf_guid stream2_guid =

  357.     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  358. static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

  359.     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};

  360. static const ff_asf_guid EVENTID_LanguageSpanningEvent =

  361.     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};

  362. static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

  363.     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};

  364. static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

  365.     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};

  366. static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

  367.     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};

  368. static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =

  369.     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};

  370. static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

  371.     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};

  372. static const ff_asf_guid EVENTID_TeletextSpanningEvent =

  373.     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};

  374. 

  375. /* Windows media GUIDs */

  376. 

  377. #define MEDIASUBTYPE_BASE_GUID \

  378.     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71

  379. 

  380. /* Media types */

  381. static const ff_asf_guid mediatype_audio =

  382.     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};

  383. static const ff_asf_guid mediatype_video =

  384.     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};

  385. static const ff_asf_guid mediasubtype_mpeg1payload =

  386.     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};

  387. static const ff_asf_guid mediatype_mpeg2_sections =

  388.     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};

  389. static const ff_asf_guid mediatype_mpeg2_pes =

  390.     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  391. static const ff_asf_guid mediatype_mstvcaption =

  392.     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};

  393. 

  394. /* Media subtypes */

  395. static const ff_asf_guid mediasubtype_cpfilters_processed =

  396.     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};

  397. static const ff_asf_guid mediasubtype_dvb_subtitle =

  398.     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};

  399. static const ff_asf_guid mediasubtype_teletext =

  400.     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  401. static const ff_asf_guid mediasubtype_dtvccdata =

  402.     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};

  403. static const ff_asf_guid mediasubtype_mpeg2_sections =

  404.     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};

  405. 

  406. /* Formats */

  407. static const ff_asf_guid format_cpfilters_processed =

  408.     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};

  409. static const ff_asf_guid format_waveformatex =

  410.     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};

  411. static const ff_asf_guid format_videoinfo2 =

  412.     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  413. static const ff_asf_guid format_mpeg2_video =

  414.     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  415. static const ff_asf_guid format_none =

  416.     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};

  417. 

  418. static const AVCodecGuid video_guids[] = {

  419.     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},

  420.     {CODEC_ID_NONE}

  421. };

  422. 

  423. static const AVCodecGuid audio_guids[] = {

  424.     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},

  425.     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},

  426.     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},

  427.     {CODEC_ID_NONE}

  428. };

  429. 

  430. static int read_probe(AVProbeData *p)

  431. {

  432.     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;

  433. }

  434. 

  435. /**

  436.  * Convert win32 FILETIME to ISO-8601 string

  437.  */

  438. static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)

  439. {

  440.     time_t t = (value / 10000000LL) - 11644473600LL;

  441.     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));

  442. }

  443. 

  444. /**

  445.  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string

  446.  */

  447. static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)

  448. {

  449.     time_t t = (value / 10000000LL) - 719162LL*86400LL;

  450.     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));

  451. }

  452. 

  453. /**

  454.  * Convert OLE DATE to ISO-8601 string

  455.  */

  456. static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)

  457. {

  458.     time_t t = 631112400LL + 86400*av_int2dbl(value);

  459.     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));

  460. }

  461. 

  462. static void get_attachment(AVFormatContext *s, ByteIOContext *pb, int length)

  463. {

  464.     char mime[1024];

  465.     char description[1024];

  466.     unsigned int filesize;

  467.     AVStream *st;

  468.     int64_t pos = url_ftell(pb);

  469. 

  470.     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));

  471.     if (strcmp(mime, "image/jpeg"))

  472.         goto done;

  473. 

  474.     get_byte(pb);

  475.     avio_get_str16le(pb, INT_MAX, description, sizeof(description));

  476.     filesize = get_le32(pb);

  477.     if (!filesize)

  478.         goto done;

  479. 

  480.     st = av_new_stream(s, 0);

  481.     if (!st)

  482.         goto done;

  483.     av_metadata_set2(&st->metadata, "title", description, 0);

  484.     st->codec->codec_id   = CODEC_ID_MJPEG;

  485.     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;

  486.     st->codec->extradata  = av_mallocz(filesize);

  487.     if (!st->codec->extradata)

  488.         goto done;

  489.     st->codec->extradata_size = filesize;

  490.     get_buffer(pb, st->codec->extradata, filesize);

  491. done:

  492.     url_fseek(pb, pos + length, SEEK_SET);

  493. }

  494. 

  495. static void get_tag(AVFormatContext *s, ByteIOContext *pb, const char *key, int type, int length)

  496. {

  497.     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;

  498.     char *buf = av_malloc(buf_size);

  499.     if (!buf)

  500.         return;

  501. 

  502.     if (type == 0 && length == 4) {

  503.         snprintf(buf, buf_size, "%"PRIi32, get_le32(pb));

  504.     } else if (type == 1) {

  505.         avio_get_str16le(pb, length, buf, buf_size);

  506.         if (!strlen(buf)) {

  507.            av_free(buf);

  508.            return;

  509.         }

  510.     } else if (type == 3 && length == 4) {

  511.         strcpy(buf, get_le32(pb) ? "true" : "false");

  512.     } else if (type == 4 && length == 8) {

  513.         int64_t num = get_le64(pb);

  514.         if (!strcmp(key, "WM/EncodingTime") ||

  515.             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))

  516.             filetime_to_iso8601(buf, buf_size, num);

  517.         else if (!strcmp(key, "WM/WMRVEncodeTime") ||

  518.                  !strcmp(key, "WM/WMRVEndTime"))

  519.             crazytime_to_iso8601(buf, buf_size, num);

  520.         else if (!strcmp(key, "WM/WMRVExpirationDate"))

  521.             oledate_to_iso8601(buf, buf_size, num);

  522.         else if (!strcmp(key, "WM/WMRVBitrate"))

  523.             snprintf(buf, buf_size, "%f", av_int2dbl(num));

  524.         else

  525.             snprintf(buf, buf_size, "%"PRIi64, num);

  526.     } else if (type == 5 && length == 2) {

  527.         snprintf(buf, buf_size, "%"PRIi16, get_le16(pb));

  528.     } else if (type == 6 && length == 16) {

  529.         ff_asf_guid guid;

  530.         get_buffer(pb, guid, 16);

  531.         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));

  532.     } else if (type == 2 && !strcmp(key, "WM/Picture")) {

  533.         get_attachment(s, pb, length);

  534.         av_freep(&buf);

  535.         return;

  536.     } else {

  537.         av_freep(&buf);

  538.         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);

  539.         url_fskip(pb, length);

  540.         return;

  541.     }

  542. 

  543.     av_metadata_set2(&s->metadata, key, buf, 0);

  544.     av_freep(&buf);

  545. }

  546. 

  547. /**

  548.  * Parse metadata entries

  549.  */

  550. static void parse_legacy_attrib(AVFormatContext *s, ByteIOContext *pb)

  551. {

  552.     ff_asf_guid guid;

  553.     int length, type;

  554.     while(!url_feof(pb)) {

  555.         char key[1024];

  556.         ff_get_guid(pb, &guid);

  557.         type   = get_le32(pb);

  558.         length = get_le32(pb);

  559.         if (!length)

  560.             break;

  561.         if (ff_guidcmp(&guid, metadata_guid)) {

  562.             av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "

  563.                    "remaining metadata entries ignored\n", ARG_GUID(guid));

  564.             break;

  565.         }

  566.         avio_get_str16le(pb, INT_MAX, key, sizeof(key));

  567.         get_tag(s, pb, key, type, length);

  568.     }

  569. 

  570.     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);

  571. }

  572. 

  573. /**

  574.  * parse VIDEOINFOHEADER2 structure

  575.  * @return bytes consumed

  576.  */

  577. static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)

  578. {

  579.     WtvContext *wtv = s->priv_data;

  580.     ByteIOContext *pb = wtv->pb;

  581. 

  582.     url_fskip(pb, 72);  // picture aspect ratio is unreliable

  583.     ff_get_bmp_header(pb, st);

  584. 

  585.     return 72 + 40;

  586. }

  587. 

  588. /**

  589.  * Parse MPEG1WAVEFORMATEX extradata structure

  590.  */

  591. static void parse_mpeg1waveformatex(AVStream *st)

  592. {

  593.     /* fwHeadLayer */

  594.     switch (AV_RL16(st->codec->extradata)) {

  595.     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;

  596.     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;

  597.     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;

  598.     }

  599. 

  600.     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */

  601. 

  602.     /* dwHeadMode */

  603.     switch (AV_RL16(st->codec->extradata + 6)) {

  604.     case 1 : case 2 : case 4 : st->codec->channels = 2; break;

  605.     case 8 :                   st->codec->channels = 1; break;

  606.     }

  607. }

  608. 

  609. /**

  610.  * Initialise stream

  611.  * @param st Stream to initialise, or NULL to create and initialise new stream

  612.  * @return NULL on error

  613.  */

  614. static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)

  615. {

  616.     if (st) {

  617.         if (st->codec->extradata) {

  618.             av_freep(&st->codec->extradata);

  619.             st->codec->extradata_size = 0;

  620.         }

  621.     } else {

  622.         WtvStream *wst = av_mallocz(sizeof(WtvStream));

  623.         if (!wst)

  624.             return NULL;

  625.         st = av_new_stream(s, sid);

  626.         if (!st)

  627.             return NULL;

  628.         st->priv_data = wst;

  629.     }

  630.     st->codec->codec_type = codec_type;

  631.     st->need_parsing      = AVSTREAM_PARSE_FULL;

  632.     av_set_pts_info(st, 64, 1, 10000000);

  633.     return st;

  634. }

  635. 

  636. /**

  637.  * parse Media Type structure and populate stream

  638.  * @param st         Stream, or NULL to create new stream

  639.  * @param mediatype  Mediatype GUID

  640.  * @param subtype    Subtype GUID

  641.  * @param formattype Format GUID

  642.  * @param size       Size of format buffer

  643.  * @return NULL on error

  644.  */

  645. static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,

  646.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  647.                                    ff_asf_guid formattype, int size)

  648. {

  649.     WtvContext *wtv = s->priv_data;

  650.     ByteIOContext *pb = wtv->pb;

  651.     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&

  652.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  653.         ff_asf_guid actual_subtype;

  654.         ff_asf_guid actual_formattype;

  655. 

  656.         if (size < 32) {

  657.             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");

  658.             url_fskip(pb, size);

  659.             return NULL;

  660.         }

  661. 

  662.         url_fskip(pb, size - 32);

  663.         ff_get_guid(pb, &actual_subtype);

  664.         ff_get_guid(pb, &actual_formattype);

  665.         url_fseek(pb, -size, SEEK_CUR);

  666. 

  667.         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);

  668.         url_fskip(pb, 32);

  669.         return st;

  670.     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {

  671.         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);

  672.         if (!st)

  673.             return NULL;

  674.         if (!ff_guidcmp(formattype, format_waveformatex)) {

  675.             ff_get_wav_header(pb, st->codec, size);

  676.         } else {

  677.             if (ff_guidcmp(formattype, format_none))

  678.                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  679.             url_fskip(pb, size);

  680.         }

  681. 

  682.         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {

  683.             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);

  684.         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {

  685.             if (st->codec->extradata && st->codec->extradata_size >= 22)

  686.                 parse_mpeg1waveformatex(st);

  687.             else

  688.                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");

  689.         } else {

  690.             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);

  691.             if (st->codec->codec_id == CODEC_ID_NONE)

  692.                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));

  693.         }

  694.         return st;

  695.     } else if (!ff_guidcmp(mediatype, mediatype_video)) {

  696.         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);

  697.         if (!st)

  698.             return NULL;

  699.         if (!ff_guidcmp(formattype, format_videoinfo2)) {

  700.             int consumed = parse_videoinfoheader2(s, st);

  701.             url_fskip(pb, FFMAX(size - consumed, 0));

  702.         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {

  703.             int consumed = parse_videoinfoheader2(s, st);

  704.             url_fskip(pb, FFMAX(size - consumed, 0));

  705.         } else {

  706.             if (ff_guidcmp(formattype, format_none))

  707.                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  708.             url_fskip(pb, size);

  709.         }

  710. 

  711.         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {

  712.             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));

  713.         } else {

  714.             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);

  715.         }

  716.         if (st->codec->codec_id == CODEC_ID_NONE)

  717.             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));

  718.         return st;

  719.     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&

  720.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

  721.         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);

  722.         if (!st)

  723.             return NULL;

  724.         if (ff_guidcmp(formattype, format_none))

  725.             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  726.         url_fskip(pb, size);

  727.         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;

  728.         return st;

  729.     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&

  730.                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {

  731.         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);

  732.         if (!st)

  733.             return NULL;

  734.         if (ff_guidcmp(formattype, format_none))

  735.             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  736.         url_fskip(pb, size);

  737.         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;

  738.         return st;

  739.     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&

  740.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  741.         if (ff_guidcmp(formattype, format_none))

  742.             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  743.         url_fskip(pb, size);

  744.         return NULL;

  745.     }

  746. 

  747.     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID

  748.                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",

  749.                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));

  750.     url_fskip(pb, size);

  751.     return NULL;

  752. }

  753. 

  754. enum {

  755.     SEEK_TO_DATA = 0,

  756.     SEEK_TO_PTS,

  757. };

  758. 

  759. /**

  760.  * Parse WTV chunks

  761.  * @param mode SEEK_TO_DATA or SEEK_TO_PTS

  762.  * @param seekts timestamp

  763.  * @param[out] len Length of data chunk

  764.  * @return stream index of data chunk, or <0 on error

  765.  */

  766. static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)

  767. {

  768.     WtvContext *wtv = s->priv_data;

  769.     ByteIOContext *pb = wtv->pb;

  770.     while (!url_feof(pb)) {

  771.         ff_asf_guid g;

  772.         int len, sid, consumed;

  773. 

  774.         ff_get_guid(pb, &g);

  775.         len = get_le32(pb);

  776.         if (len < 32)

  777.             break;

  778.         sid = get_le32(pb) & 0x7FFF;

  779.         url_fskip(pb, 8);

  780.         consumed = 32;

  781. 

  782.         if (!ff_guidcmp(g, stream_guid)) {

  783.             if (ff_find_stream_index(s, sid) < 0) {

  784.                 ff_asf_guid mediatype, subtype, formattype;

  785.                 int size;

  786.                 url_fskip(pb, 28);

  787.                 ff_get_guid(pb, &mediatype);

  788.                 ff_get_guid(pb, &subtype);

  789.                 url_fskip(pb, 12);

  790.                 ff_get_guid(pb, &formattype);

  791.                 size = get_le32(pb);

  792.                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);

  793.                 consumed += 92 + size;

  794.             }

  795.         } else if (!ff_guidcmp(g, stream2_guid)) {

  796.             int stream_index = ff_find_stream_index(s, sid);

  797.             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {

  798.                 ff_asf_guid mediatype, subtype, formattype;

  799.                 int size;

  800.                 url_fskip(pb, 12);

  801.                 ff_get_guid(pb, &mediatype);

  802.                 ff_get_guid(pb, &subtype);

  803.                 url_fskip(pb, 12);

  804.                 ff_get_guid(pb, &formattype);

  805.                 size = get_le32(pb);

  806.                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);

  807.                 consumed += 76 + size;

  808.             }

  809.         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||

  810.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  811.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  812.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  813.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  814.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

  815.             int stream_index = ff_find_stream_index(s, sid);

  816.             if (stream_index >= 0) {

  817.                 AVStream *st = s->streams[stream_index];

  818.                 uint8_t buf[258];

  819.                 const uint8_t *pbuf = buf;

  820.                 int buf_size;

  821. 

  822.                 url_fskip(pb, 8);

  823.                 consumed += 8;

  824.                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  825.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  826.                     url_fskip(pb, 6);

  827.                     consumed += 6;

  828.                 }

  829. 

  830.                 buf_size = FFMIN(len - consumed, sizeof(buf));

  831.                 get_buffer(pb, buf, buf_size);

  832.                 consumed += buf_size;

  833.                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);

  834.             }

  835.         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {

  836.             int stream_index = ff_find_stream_index(s, sid);

  837.             if (stream_index >= 0) {

  838.                 url_fskip(pb, 12);

  839.                 if (get_le32(pb))

  840.                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);

  841.                 consumed += 16;

  842.             }

  843.         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {

  844.             int stream_index = ff_find_stream_index(s, sid);

  845.             if (stream_index >= 0) {

  846.                 AVStream *st = s->streams[stream_index];

  847.                 uint8_t language[4];

  848.                 url_fskip(pb, 12);

  849.                 get_buffer(pb, language, 3);

  850.                 if (language[0]) {

  851.                     language[3] = 0;

  852.                     av_metadata_set2(&st->metadata, "language", language, 0);

  853.                 }

  854.                 consumed += 15;

  855.             }

  856.         } else if (!ff_guidcmp(g, timestamp_guid)) {

  857.             int stream_index = ff_find_stream_index(s, sid);

  858.             if (stream_index >= 0) {

  859.                 url_fskip(pb, 8);

  860.                 wtv->pts = get_le64(pb);

  861.                 consumed += 16;

  862.                 if (wtv->pts == -1)

  863.                     wtv->pts = AV_NOPTS_VALUE;

  864.                 else {

  865.                     wtv->last_valid_pts = wtv->pts;

  866.                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)

  867.                         wtv->epoch = wtv->pts;

  868.                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {

  869. #define WTV_PAD8(x) (((x) + 7) & ~7)

  870.                     url_fskip(pb, WTV_PAD8(len) - consumed);

  871.                     return 0;

  872.                 }

  873.                 }

  874.             }

  875.         } else if (!ff_guidcmp(g, data_guid)) {

  876.             int stream_index = ff_find_stream_index(s, sid);

  877.             if (mode == SEEK_TO_DATA && stream_index >= 0) {

  878.                 WtvStream *wst = s->streams[stream_index]->priv_data;

  879.                 wst->seen_data = 1;

  880.                 if (len_ptr) {

  881.                     *len_ptr = len;

  882.                 }

  883.                 return stream_index;

  884.             }

  885.         } else if (

  886.             !ff_guidcmp(g, /* DSATTRIB_CAPTURE_STREAMTIME */ (const ff_asf_guid){0x14,0x56,0x1A,0x0C,0xCD,0x30,0x40,0x4F,0xBC,0xBF,0xD0,0x3E,0x52,0x30,0x62,0x07}) ||

  887.             !ff_guidcmp(g, /* DSATTRIB_PicSampleSeq */ (const ff_asf_guid){0x02,0xAE,0x5B,0x2F,0x8F,0x7B,0x60,0x4F,0x82,0xD6,0xE4,0xEA,0x2F,0x1F,0x4C,0x99}) ||

  888.             !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ (const ff_asf_guid){0x12,0xF6,0x22,0xB6,0xAD,0x47,0x71,0x46,0xAD,0x6C,0x05,0xA9,0x8E,0x65,0xDE,0x3A}) ||

  889.             !ff_guidcmp(g, /* dvr_ms_vid_frame_rep_data */ (const ff_asf_guid){0xCC,0x32,0x64,0xDD,0x29,0xE2,0xDB,0x40,0x80,0xF6,0xD2,0x63,0x28,0xD2,0x76,0x1F}) ||

  890.             !ff_guidcmp(g, /* EVENTID_AudioTypeSpanningEvent */ (const ff_asf_guid){0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3}) ||

  891.             !ff_guidcmp(g, /* EVENTID_ChannelChangeSpanningEvent */ (const ff_asf_guid){0xE5,0xC5,0x67,0x90,0x5C,0x4C,0x05,0x42,0x86,0xC8,0x7A,0xFE,0x20,0xFE,0x1E,0xFA}) ||

  892.             !ff_guidcmp(g, /* EVENTID_ChannelInfoSpanningEvent */ (const ff_asf_guid){0x80,0x6D,0xF3,0x41,0x32,0x41,0xC2,0x4C,0xB1,0x21,0x01,0xA4,0x32,0x19,0xD8,0x1B}) ||

  893.             !ff_guidcmp(g, /* EVENTID_ChannelTypeSpanningEvent */ (const ff_asf_guid){0x51,0x1D,0xAB,0x72,0xD2,0x87,0x9B,0x48,0xBA,0x11,0x0E,0x08,0xDC,0x21,0x02,0x43}) ||

  894.             !ff_guidcmp(g, /* EVENTID_PIDListSpanningEvent */ (const ff_asf_guid){0x65,0x8F,0xFC,0x47,0xBB,0xE2,0x34,0x46,0x9C,0xEF,0xFD,0xBF,0xE6,0x26,0x1D,0x5C}) ||

  895.             !ff_guidcmp(g, /* EVENTID_SignalAndServiceStatusSpanningEvent */ (const ff_asf_guid){0xCB,0xC5,0x68,0x80,0x04,0x3C,0x2B,0x49,0xB4,0x7D,0x03,0x08,0x82,0x0D,0xCE,0x51}) ||

  896.             !ff_guidcmp(g, /* EVENTID_StreamTypeSpanningEvent */ (const ff_asf_guid){0xBC,0x2E,0xAF,0x82,0xA6,0x30,0x64,0x42,0xA8,0x0B,0xAD,0x2E,0x13,0x72,0xAC,0x60}) ||

  897.             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||

  898.             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||

  899.             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||

  900.             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||

  901.             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||

  902.             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||

  903.             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||

  904.             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {

  905.             //ignore known guids

  906.         } else

  907.             av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));

  908. 

  909.         url_fskip(pb, WTV_PAD8(len) - consumed);

  910.     }

  911.     return AVERROR_EOF;

  912. }

  913. 

  914. /* declare utf16le strings */

  915. #define _ , 0,

  916. static const uint8_t timeline_le16[] =

  917.     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};

  918. static const uint8_t table_0_entries_legacy_attrib_le16[] =

  919.     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};

  920. static const uint8_t table_0_entries_time_le16[] =

  921.     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};

  922. static const uint8_t timeline_table_0_entries_Events_le16[] =

  923.     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e'_'.'_'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'E'_'v'_'e'_'n'_'t'_'s', 0};

  924. #undef _

  925. 

  926. static int read_header(AVFormatContext *s, AVFormatParameters *ap)

  927. {

  928.     WtvContext *wtv = s->priv_data;

  929.     int root_sector, root_size;

  930.     uint8_t root[WTV_SECTOR_SIZE];

  931.     ByteIOContext *pb;

  932.     int64_t timeline_pos;

  933.     int ret;

  934. 

  935.     wtv->epoch          =

  936.     wtv->pts            =

  937.     wtv->last_valid_pts = AV_NOPTS_VALUE;

  938. 

  939.     /* read root directory sector */

  940.     url_fskip(s->pb, 0x30);

  941.     root_size = get_le32(s->pb);

  942.     if (root_size > sizeof(root)) {

  943.         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");

  944.         return AVERROR_INVALIDDATA;

  945.     }

  946.     url_fskip(s->pb, 4);

  947.     root_sector = get_le32(s->pb);

  948. 

  949.     url_fseek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);

  950.     root_size = get_buffer(s->pb, root, root_size);

  951.     if (root_size < 0)

  952.         return AVERROR_INVALIDDATA;

  953. 

  954.     /* parse chunks up until first data chunk */

  955.     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);

  956.     if (!wtv->pb) {

  957.         av_log(s, AV_LOG_ERROR, "timeline data missing\n");

  958.         return AVERROR_INVALIDDATA;

  959.     }

  960. 

  961.     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);

  962.     if (ret < 0)

  963.         return ret;

  964.     url_fseek(wtv->pb, -32, SEEK_CUR);

  965. 

  966.     timeline_pos = url_ftell(s->pb); // save before opening another file

  967. 

  968.     /* read metadata */

  969.     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);

  970.     if (pb) {

  971.         parse_legacy_attrib(s, pb);

  972.         wtvfile_close(pb);

  973.     }

  974. 

  975.     /* read seek index */

  976.     if (s->nb_streams) {

  977.         AVStream *st = s->streams[0];

  978.         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);

  979.         if (pb) {

  980.             while(1) {

  981.                 uint64_t timestamp = get_le64(pb);

  982.                 uint64_t frame_nb  = get_le64(pb);

  983.                 if (url_feof(pb))

  984.                     break;

  985.                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,

  986.                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

  987.             }

  988.             wtvfile_close(pb);

  989. 

  990.             if (wtv->nb_index_entries) {

  991.                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);

  992.                 if (pb) {

  993.                     int i;

  994.                     while (1) {

  995.                         uint64_t frame_nb = get_le64(pb);

  996.                         uint64_t position = get_le64(pb);

  997.                         if (url_feof(pb))

  998.                             break;

  999.                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {

  1000.                             AVIndexEntry *e = wtv->index_entries + i;

  1001.                             if (frame_nb > e->size)

  1002.                                 break;

  1003.                             if (position > e->pos)

  1004.                                 e->pos = position;

  1005.                         }

  1006.                     }

  1007.                     wtvfile_close(pb);

  1008.                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;

  1009.                 }

  1010.             }

  1011.         }

  1012.     }

  1013. 

  1014.     url_fseek(s->pb, timeline_pos, SEEK_SET);

  1015.     return 0;

  1016. }

  1017. 

  1018. static int read_packet(AVFormatContext *s, AVPacket *pkt)

  1019. {

  1020.     WtvContext *wtv = s->priv_data;

  1021.     ByteIOContext *pb = wtv->pb;

  1022.     int stream_index, len, ret;

  1023. 

  1024.     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);

  1025.     if (stream_index < 0)

  1026.         return stream_index;

  1027. 

  1028.     ret = av_get_packet(pb, pkt, len - 32);

  1029.     if (ret < 0)

  1030.         return ret;

  1031.     pkt->stream_index = stream_index;

  1032.     pkt->pts          = wtv->pts;

  1033.     url_fskip(pb, WTV_PAD8(len) - len);

  1034.     return 0;

  1035. }

  1036. 

  1037. static int read_seek(AVFormatContext *s, int stream_index,

  1038.                      int64_t ts, int flags)

  1039. {

  1040.     WtvContext *wtv = s->priv_data;

  1041.     ByteIOContext *pb = wtv->pb;

  1042.     AVStream *st = s->streams[0];

  1043.     int64_t ts_relative;

  1044.     int i;

  1045. 

  1046.     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

  1047.         return AVERROR_NOTSUPP;

  1048. 

  1049.     /* timestamp adjustment is required because wtv->pts values are absolute,

  1050.      * whereas AVIndexEntry->timestamp values are relative to epoch. */

  1051.     ts_relative = ts;

  1052.     if (wtv->epoch != AV_NOPTS_VALUE)

  1053.         ts_relative -= wtv->epoch;

  1054. 

  1055.     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

  1056.     if (i < 0) {

  1057.         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

  1058.             url_fseek(pb, 0, SEEK_SET);

  1059.         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

  1060.             url_fseek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

  1061.         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)

  1062.             return AVERROR(ERANGE);

  1063.         return 0;

  1064.     }

  1065.     wtv->pts = wtv->index_entries[i].timestamp;

  1066.     if (wtv->epoch != AV_NOPTS_VALUE)

  1067.         wtv->pts += wtv->epoch;

  1068.     wtv->last_valid_pts = wtv->pts;

  1069.     url_fseek(pb, wtv->index_entries[i].pos, SEEK_SET);

  1070.     return 0;

  1071. }

  1072. 

  1073. static int read_close(AVFormatContext *s)

  1074. {

  1075.     WtvContext *wtv = s->priv_data;

  1076.     wtvfile_close(wtv->pb);

  1077.     return 0;

  1078. }

  1079. 

  1080. AVInputFormat ff_wtv_demuxer = {

  1081.     .name           = "wtv",

  1082.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),

  1083.     .priv_data_size = sizeof(WtvContext),

  1084.     .read_probe     = read_probe,

  1085.     .read_header    = read_header,

  1086.     .read_packet    = read_packet,

  1087.     .read_seek      = read_seek,

  1088.     .read_close     = read_close,

  1089.     .flags          = AVFMT_SHOW_IDS,

  1090. };