falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35406 Commits
32 Branches
759MB
Tree: c3e15f7b39
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'c3e15f7b39'
${ noResults }
FFmpeg/libavformat/wtv.c

1126 lines
42KB
Raw Blame History 

  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 AVCodecID id;

  335.     ff_asf_guid guid;

  336. } AVCodecGuid;

  337. 

  338. static enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)

  339. {

  340.     int i;

  341.     for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++) {

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

  343.             return guids[i].id;

  344.     }

  345.     return AV_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.     {AV_CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},

  425.     {AV_CODEC_ID_NONE}

  426. };

  427. 

  428. static const AVCodecGuid audio_guids[] = {

  429.     {AV_CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},

  430.     {AV_CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},

  431.     {AV_CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},

  432.     {AV_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.     struct tm *tm = gmtime(&t);

  447.     if (tm)

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

  449.     else

  450.         buf[0] = '\0';

  451. }

  452. 

  453. /**

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

  455.  */

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

  457. {

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

  459.     struct tm *tm = gmtime(&t);

  460.     if (tm)

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

  462.     else

  463.         buf[0] = '\0';

  464. }

  465. 

  466. /**

  467.  * Convert OLE DATE to ISO-8601 string

  468.  */

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

  470. {

  471.     time_t t = 631112400LL + 86400*av_int2double(value);

  472.     struct tm *tm = gmtime(&t);

  473.     if (tm)

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

  475.     else

  476.         buf[0] = '\0';

  477. }

  478. 

  479. static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)

  480. {

  481.     char mime[1024];

  482.     char description[1024];

  483.     unsigned int filesize;

  484.     AVStream *st;

  485.     int64_t pos = avio_tell(pb);

  486. 

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

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

  489.         goto done;

  490. 

  491.     avio_r8(pb);

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

  493.     filesize = avio_rl32(pb);

  494.     if (!filesize)

  495.         goto done;

  496. 

  497.     st = avformat_new_stream(s, NULL);

  498.     if (!st)

  499.         goto done;

  500.     av_dict_set(&st->metadata, "title", description, 0);

  501.     st->codec->codec_id   = AV_CODEC_ID_MJPEG;

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

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

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

  505.         goto done;

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

  507.     avio_read(pb, st->codec->extradata, filesize);

  508. done:

  509.     avio_seek(pb, pos + length, SEEK_SET);

  510. }

  511. 

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

  513. {

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

  515.     char *buf = av_malloc(buf_size);

  516.     if (!buf)

  517.         return;

  518. 

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

  520.         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));

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

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

  523.         if (!strlen(buf)) {

  524.            av_free(buf);

  525.            return;

  526.         }

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

  528.         strcpy(buf, avio_rl32(pb) ? "true" : "false");

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

  530.         int64_t num = avio_rl64(pb);

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

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

  533.             filetime_to_iso8601(buf, buf_size, num);

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

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

  536.             crazytime_to_iso8601(buf, buf_size, num);

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

  538.             oledate_to_iso8601(buf, buf_size, num);

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

  540.             snprintf(buf, buf_size, "%f", av_int2double(num));

  541.         else

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

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

  544.         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));

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

  546.         ff_asf_guid guid;

  547.         avio_read(pb, guid, 16);

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

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

  550.         get_attachment(s, pb, length);

  551.         av_freep(&buf);

  552.         return;

  553.     } else {

  554.         av_freep(&buf);

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

  556.         avio_skip(pb, length);

  557.         return;

  558.     }

  559. 

  560.     av_dict_set(&s->metadata, key, buf, 0);

  561.     av_freep(&buf);

  562. }

  563. 

  564. /**

  565.  * Parse metadata entries

  566.  */

  567. static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)

  568. {

  569.     ff_asf_guid guid;

  570.     int length, type;

  571.     while(!pb->eof_reached) {

  572.         char key[1024];

  573.         ff_get_guid(pb, &guid);

  574.         type   = avio_rl32(pb);

  575.         length = avio_rl32(pb);

  576.         if (!length)

  577.             break;

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

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

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

  581.             break;

  582.         }

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

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

  585.     }

  586. 

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

  588. }

  589. 

  590. /**

  591.  * parse VIDEOINFOHEADER2 structure

  592.  * @return bytes consumed

  593.  */

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

  595. {

  596.     WtvContext *wtv = s->priv_data;

  597.     AVIOContext *pb = wtv->pb;

  598. 

  599.     avio_skip(pb, 72);  // picture aspect ratio is unreliable

  600.     ff_get_bmp_header(pb, st);

  601. 

  602.     return 72 + 40;

  603. }

  604. 

  605. /**

  606.  * Parse MPEG1WAVEFORMATEX extradata structure

  607.  */

  608. static void parse_mpeg1waveformatex(AVStream *st)

  609. {

  610.     /* fwHeadLayer */

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

  612.     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;

  613.     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;

  614.     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;

  615.     }

  616. 

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

  618. 

  619.     /* dwHeadMode */

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

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

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

  623.     }

  624. }

  625. 

  626. /**

  627.  * Initialise stream

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

  629.  * @return NULL on error

  630.  */

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

  632. {

  633.     if (st) {

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

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

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

  637.         }

  638.     } else {

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

  640.         if (!wst)

  641.             return NULL;

  642.         st = avformat_new_stream(s, NULL);

  643.         if (!st)

  644.             return NULL;

  645.         st->id = sid;

  646.         st->priv_data = wst;

  647.     }

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

  649.     st->need_parsing      = AVSTREAM_PARSE_FULL;

  650.     avpriv_set_pts_info(st, 64, 1, 10000000);

  651.     return st;

  652. }

  653. 

  654. /**

  655.  * parse Media Type structure and populate stream

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

  657.  * @param mediatype  Mediatype GUID

  658.  * @param subtype    Subtype GUID

  659.  * @param formattype Format GUID

  660.  * @param size       Size of format buffer

  661.  * @return NULL on error

  662.  */

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

  664.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  665.                                    ff_asf_guid formattype, int size)

  666. {

  667.     WtvContext *wtv = s->priv_data;

  668.     AVIOContext *pb = wtv->pb;

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

  670.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  671.         ff_asf_guid actual_subtype;

  672.         ff_asf_guid actual_formattype;

  673. 

  674.         if (size < 32) {

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

  676.             avio_skip(pb, size);

  677.             return NULL;

  678.         }

  679. 

  680.         avio_skip(pb, size - 32);

  681.         ff_get_guid(pb, &actual_subtype);

  682.         ff_get_guid(pb, &actual_formattype);

  683.         avio_seek(pb, -size, SEEK_CUR);

  684. 

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

  686.         avio_skip(pb, 32);

  687.         return st;

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

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

  690.         if (!st)

  691.             return NULL;

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

  693.             int ret = ff_get_wav_header(pb, st->codec, size);

  694.             if (ret < 0)

  695.                 return NULL;

  696.         } else {

  697.             if (ff_guidcmp(formattype, format_none))

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

  699.             avio_skip(pb, size);

  700.         }

  701. 

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

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

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

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

  706.                 parse_mpeg1waveformatex(st);

  707.             else

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

  709.         } else {

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

  711.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

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

  713.         }

  714.         return st;

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

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

  717.         if (!st)

  718.             return NULL;

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

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

  721.             avio_skip(pb, FFMAX(size - consumed, 0));

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

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

  724.             avio_skip(pb, FFMAX(size - consumed, 0));

  725.         } else {

  726.             if (ff_guidcmp(formattype, format_none))

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

  728.             avio_skip(pb, size);

  729.         }

  730. 

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

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

  733.         } else {

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

  735.         }

  736.         if (st->codec->codec_id == AV_CODEC_ID_NONE)

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

  738.         return st;

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

  740.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

  742.         if (!st)

  743.             return NULL;

  744.         if (ff_guidcmp(formattype, format_none))

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

  746.         avio_skip(pb, size);

  747.         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;

  748.         return st;

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

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

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

  752.         if (!st)

  753.             return NULL;

  754.         if (ff_guidcmp(formattype, format_none))

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

  756.         avio_skip(pb, size);

  757.         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;

  758.         return st;

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

  760.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  761.         if (ff_guidcmp(formattype, format_none))

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

  763.         avio_skip(pb, size);

  764.         return NULL;

  765.     }

  766. 

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

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

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

  770.     avio_skip(pb, size);

  771.     return NULL;

  772. }

  773. 

  774. enum {

  775.     SEEK_TO_DATA = 0,

  776.     SEEK_TO_PTS,

  777. };

  778. 

  779. /**

  780.  * Parse WTV chunks

  781.  * @param mode SEEK_TO_DATA or SEEK_TO_PTS

  782.  * @param seekts timestamp

  783.  * @param[out] len_ptr Length of data chunk

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

  785.  */

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

  787. {

  788.     WtvContext *wtv = s->priv_data;

  789.     AVIOContext *pb = wtv->pb;

  790.     while (!pb->eof_reached) {

  791.         ff_asf_guid g;

  792.         int len, sid, consumed;

  793. 

  794.         ff_get_guid(pb, &g);

  795.         len = avio_rl32(pb);

  796.         if (len < 32)

  797.             break;

  798.         sid = avio_rl32(pb) & 0x7FFF;

  799.         avio_skip(pb, 8);

  800.         consumed = 32;

  801. 

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

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

  804.                 ff_asf_guid mediatype, subtype, formattype;

  805.                 int size;

  806.                 avio_skip(pb, 28);

  807.                 ff_get_guid(pb, &mediatype);

  808.                 ff_get_guid(pb, &subtype);

  809.                 avio_skip(pb, 12);

  810.                 ff_get_guid(pb, &formattype);

  811.                 size = avio_rl32(pb);

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

  813.                 consumed += 92 + size;

  814.             }

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

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

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

  818.                 ff_asf_guid mediatype, subtype, formattype;

  819.                 int size;

  820.                 avio_skip(pb, 12);

  821.                 ff_get_guid(pb, &mediatype);

  822.                 ff_get_guid(pb, &subtype);

  823.                 avio_skip(pb, 12);

  824.                 ff_get_guid(pb, &formattype);

  825.                 size = avio_rl32(pb);

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

  827.                 consumed += 76 + size;

  828.             }

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

  830.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  831.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  832.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  833.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  834.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

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

  836.             if (stream_index >= 0) {

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

  838.                 uint8_t buf[258];

  839.                 const uint8_t *pbuf = buf;

  840.                 int buf_size;

  841. 

  842.                 avio_skip(pb, 8);

  843.                 consumed += 8;

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

  845.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  846.                     avio_skip(pb, 6);

  847.                     consumed += 6;

  848.                 }

  849. 

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

  851.                 avio_read(pb, buf, buf_size);

  852.                 consumed += buf_size;

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

  854.             }

  855.         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {

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

  857.             if (stream_index >= 0) {

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

  859.                 int audio_type;

  860.                 avio_skip(pb, 8);

  861.                 audio_type = avio_r8(pb);

  862.                 if (audio_type == 2)

  863.                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

  864.                 else if (audio_type == 3)

  865.                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  866.                 consumed += 9;

  867.             }

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

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

  870.             if (stream_index >= 0) {

  871.                 avio_skip(pb, 12);

  872.                 if (avio_rl32(pb))

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

  874.                 consumed += 16;

  875.             }

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

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

  878.             if (stream_index >= 0) {

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

  880.                 uint8_t language[4];

  881.                 avio_skip(pb, 12);

  882.                 avio_read(pb, language, 3);

  883.                 if (language[0]) {

  884.                     language[3] = 0;

  885.                     av_dict_set(&st->metadata, "language", language, 0);

  886.                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))

  887.                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  888.                 }

  889.                 consumed += 15;

  890.             }

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

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

  893.             if (stream_index >= 0) {

  894.                 avio_skip(pb, 8);

  895.                 wtv->pts = avio_rl64(pb);

  896.                 consumed += 16;

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

  898.                     wtv->pts = AV_NOPTS_VALUE;

  899.                 else {

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

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

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

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

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

  905.                     avio_skip(pb, WTV_PAD8(len) - consumed);

  906.                     return 0;

  907.                 }

  908.                 }

  909.             }

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

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

  912.             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {

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

  914.                 wst->seen_data = 1;

  915.                 if (len_ptr) {

  916.                     *len_ptr = len;

  917.                 }

  918.                 return stream_index;

  919.             }

  920.         } else if (

  921.             !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}) ||

  922.             !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}) ||

  923.             !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}) ||

  924.             !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}) ||

  925.             !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}) ||

  926.             !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}) ||

  927.             !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}) ||

  928.             !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}) ||

  929.             !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}) ||

  930.             !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}) ||

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

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

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

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

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

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

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

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

  939.             //ignore known guids

  940.         } else

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

  942. 

  943.         avio_skip(pb, WTV_PAD8(len) - consumed);

  944.     }

  945.     return AVERROR_EOF;

  946. }

  947. 

  948. /* declare utf16le strings */

  949. #define _ , 0,

  950. static const uint8_t timeline_le16[] =

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

  952. static const uint8_t table_0_entries_legacy_attrib_le16[] =

  953.     {'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};

  954. static const uint8_t table_0_entries_time_le16[] =

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

  956. static const uint8_t timeline_table_0_entries_Events_le16[] =

  957.     {'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};

  958. #undef _

  959. 

  960. static int read_header(AVFormatContext *s)

  961. {

  962.     WtvContext *wtv = s->priv_data;

  963.     int root_sector, root_size;

  964.     uint8_t root[WTV_SECTOR_SIZE];

  965.     AVIOContext *pb;

  966.     int64_t timeline_pos;

  967.     int ret;

  968. 

  969.     wtv->epoch          =

  970.     wtv->pts            =

  971.     wtv->last_valid_pts = AV_NOPTS_VALUE;

  972. 

  973.     /* read root directory sector */

  974.     avio_skip(s->pb, 0x30);

  975.     root_size = avio_rl32(s->pb);

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

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

  978.         return AVERROR_INVALIDDATA;

  979.     }

  980.     avio_skip(s->pb, 4);

  981.     root_sector = avio_rl32(s->pb);

  982. 

  983.     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);

  984.     root_size = avio_read(s->pb, root, root_size);

  985.     if (root_size < 0)

  986.         return AVERROR_INVALIDDATA;

  987. 

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

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

  990.     if (!wtv->pb) {

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

  992.         return AVERROR_INVALIDDATA;

  993.     }

  994. 

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

  996.     if (ret < 0)

  997.         return ret;

  998.     avio_seek(wtv->pb, -32, SEEK_CUR);

  999. 

  1000.     timeline_pos = avio_tell(s->pb); // save before opening another file

  1001. 

  1002.     /* read metadata */

  1003.     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);

  1004.     if (pb) {

  1005.         parse_legacy_attrib(s, pb);

  1006.         wtvfile_close(pb);

  1007.     }

  1008. 

  1009.     /* read seek index */

  1010.     if (s->nb_streams) {

  1011.         AVStream *st = s->streams[0];

  1012.         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);

  1013.         if (pb) {

  1014.             while(1) {

  1015.                 uint64_t timestamp = avio_rl64(pb);

  1016.                 uint64_t frame_nb  = avio_rl64(pb);

  1017.                 if (pb->eof_reached)

  1018.                     break;

  1019.                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,

  1020.                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

  1021.             }

  1022.             wtvfile_close(pb);

  1023. 

  1024.             if (wtv->nb_index_entries) {

  1025.                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);

  1026.                 if (pb) {

  1027.                     int i;

  1028.                     while (1) {

  1029.                         uint64_t frame_nb = avio_rl64(pb);

  1030.                         uint64_t position = avio_rl64(pb);

  1031.                         if (pb->eof_reached)

  1032.                             break;

  1033.                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {

  1034.                             AVIndexEntry *e = wtv->index_entries + i;

  1035.                             if (frame_nb > e->size)

  1036.                                 break;

  1037.                             if (position > e->pos)

  1038.                                 e->pos = position;

  1039.                         }

  1040.                     }

  1041.                     wtvfile_close(pb);

  1042.                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;

  1043.                 }

  1044.             }

  1045.         }

  1046.     }

  1047. 

  1048.     avio_seek(s->pb, timeline_pos, SEEK_SET);

  1049.     return 0;

  1050. }

  1051. 

  1052. static int read_packet(AVFormatContext *s, AVPacket *pkt)

  1053. {

  1054.     WtvContext *wtv = s->priv_data;

  1055.     AVIOContext *pb = wtv->pb;

  1056.     int stream_index, len, ret;

  1057. 

  1058.     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);

  1059.     if (stream_index < 0)

  1060.         return stream_index;

  1061. 

  1062.     ret = av_get_packet(pb, pkt, len - 32);

  1063.     if (ret < 0)

  1064.         return ret;

  1065.     pkt->stream_index = stream_index;

  1066.     pkt->pts          = wtv->pts;

  1067.     avio_skip(pb, WTV_PAD8(len) - len);

  1068.     return 0;

  1069. }

  1070. 

  1071. static int read_seek(AVFormatContext *s, int stream_index,

  1072.                      int64_t ts, int flags)

  1073. {

  1074.     WtvContext *wtv = s->priv_data;

  1075.     AVIOContext *pb = wtv->pb;

  1076.     AVStream *st = s->streams[0];

  1077.     int64_t ts_relative;

  1078.     int i;

  1079. 

  1080.     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

  1081.         return AVERROR(ENOSYS);

  1082. 

  1083.     /* timestamp adjustment is required because wtv->pts values are absolute,

  1084.      * whereas AVIndexEntry->timestamp values are relative to epoch. */

  1085.     ts_relative = ts;

  1086.     if (wtv->epoch != AV_NOPTS_VALUE)

  1087.         ts_relative -= wtv->epoch;

  1088. 

  1089.     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

  1090.     if (i < 0) {

  1091.         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

  1092.             avio_seek(pb, 0, SEEK_SET);

  1093.         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

  1094.             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

  1095.         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)

  1096.             return AVERROR(ERANGE);

  1097.         return 0;

  1098.     }

  1099.     wtv->pts = wtv->index_entries[i].timestamp;

  1100.     if (wtv->epoch != AV_NOPTS_VALUE)

  1101.         wtv->pts += wtv->epoch;

  1102.     wtv->last_valid_pts = wtv->pts;

  1103.     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);

  1104.     return 0;

  1105. }

  1106. 

  1107. static int read_close(AVFormatContext *s)

  1108. {

  1109.     WtvContext *wtv = s->priv_data;

  1110.     av_free(wtv->index_entries);

  1111.     wtvfile_close(wtv->pb);

  1112.     return 0;

  1113. }

  1114. 

  1115. AVInputFormat ff_wtv_demuxer = {

  1116.     .name           = "wtv",

  1117.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),

  1118.     .priv_data_size = sizeof(WtvContext),

  1119.     .read_probe     = read_probe,

  1120.     .read_header    = read_header,

  1121.     .read_packet    = read_packet,

  1122.     .read_seek      = read_seek,

  1123.     .read_close     = read_close,

  1124.     .flags          = AVFMT_SHOW_IDS,

  1125. };