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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 Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * Windows Television (WTV) demuxer

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

  26.  */

  27. 

  28. #include "libavutil/channel_layout.h"

  29. #include "libavutil/intreadwrite.h"

  30. #include "libavutil/intfloat.h"

  31. #include "libavutil/dict.h"

  32. #include "avformat.h"

  33. #include "internal.h"

  34. #include "riff.h"

  35. #include "asf.h"

  36. #include "mpegts.h"

  37. 

  38. /* Macros for formating GUIDs */

  39. #define PRI_GUID \

  40.     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"

  41. #define ARG_GUID(g) \

  42.     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]

  43. 

  44. #define PRI_PRETTY_GUID \

  45.     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"

  46. #define ARG_PRETTY_GUID(g) \

  47.     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]

  48. #define LEN_PRETTY_GUID 34

  49. 

  50. /*

  51.  *

  52.  * File system routines

  53.  *

  54.  */

  55. 

  56. #define WTV_SECTOR_BITS    12

  57. #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)

  58. #define WTV_BIGSECTOR_BITS 18

  59. 

  60. typedef struct {

  61.     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */

  62. 

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

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

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

  66. 

  67.     int error;

  68.     int64_t position;

  69.     int64_t length;

  70. } WtvFile;

  71. 

  72. /**

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

  74.  */

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

  76. {

  77.     WtvFile *wf = opaque;

  78.     AVIOContext *pb = wf->pb_filesystem;

  79.     int nread = 0;

  80. 

  81.     if (wf->error || pb->error)

  82.         return -1;

  83.     if (wf->position >= wf->length || pb->eof_reached)

  84.         return 0;

  85. 

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

  87.     while(nread < buf_size) {

  88.         int n;

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

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

  91. 

  92.         n = avio_read(pb, buf, read_request);

  93.         if (n <= 0)

  94.             break;

  95.         nread += n;

  96.         buf += n;

  97.         wf->position += n;

  98.         if (n == remaining_in_sector) {

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

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

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

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

  103.                 wf->error = 1;

  104.                 break;

  105.             }

  106.         }

  107.     }

  108.     return nread;

  109. }

  110. 

  111. /**

  112.  * @return position (or file length)

  113.  */

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

  115. {

  116.     WtvFile *wf = opaque;

  117.     AVIOContext *pb = wf->pb_filesystem;

  118. 

  119.     if (whence == AVSEEK_SIZE)

  120.         return wf->length;

  121.     else if (whence == SEEK_CUR)

  122.         offset = wf->position + offset;

  123.     else if (whence == SEEK_END)

  124.         offset = wf->length;

  125. 

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

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

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

  129.     wf->position = offset;

  130.     return offset;

  131. }

  132. 

  133. /**

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

  135.  * @param pb

  136.  * @param[out] data destination

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

  138.  * @return    total number of integers read

  139.  */

  140. static int read_ints(AVIOContext *pb, uint32_t *data, int count)

  141. {

  142.     int i, total = 0;

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

  144.         if ((data[total] = avio_rl32(pb)))

  145.            total++;

  146.     }

  147.     return total;

  148. }

  149. 

  150. /**

  151.  * Open file

  152.  * @param first_sector  First sector

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

  154.  * @param depth         File allocation table depth

  155.  * @return NULL on error

  156.  */

  157. static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)

  158. {

  159.     AVIOContext *pb;

  160.     WtvFile *wf;

  161.     uint8_t *buffer;

  162. 

  163.     if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)

  164.         return NULL;

  165. 

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

  167.     if (!wf)

  168.         return NULL;

  169. 

  170.     if (depth == 0) {

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

  172.         if (!wf->sectors) {

  173.             av_free(wf);

  174.             return NULL;

  175.         }

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

  177.         wf->nb_sectors  = 1;

  178.         wf->sector_bits = WTV_SECTOR_BITS;

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

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

  181.         if (!wf->sectors) {

  182.             av_free(wf);

  183.             return NULL;

  184.         }

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

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

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

  188.         uint32_t sectors1[WTV_SECTOR_SIZE / 4];

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

  190.         int i;

  191. 

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

  193.         if (!wf->sectors) {

  194.             av_free(wf);

  195.             return NULL;

  196.         }

  197.         wf->nb_sectors = 0;

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

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

  200.                 break;

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

  202.         }

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

  204.     } else {

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

  206.         av_free(wf);

  207.         return NULL;

  208.     }

  209. 

  210.     if (!wf->nb_sectors) {

  211.         av_free(wf->sectors);

  212.         av_free(wf);

  213.         return NULL;

  214.     }

  215. 

  216.     /* check length */

  217.     length &= 0xFFFFFFFFFFFF;

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

  219.         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);

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

  221.     }

  222.     wf->length = length;

  223. 

  224.     /* seek to intial sector */

  225.     wf->position = 0;

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

  227.         av_free(wf->sectors);

  228.         av_free(wf);

  229.         return NULL;

  230.     }

  231. 

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

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

  234.     if (!buffer) {

  235.         av_free(wf->sectors);

  236.         av_free(wf);

  237.         return NULL;

  238.     }

  239. 

  240.     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,

  241.                            wtvfile_read_packet, NULL, wtvfile_seek);

  242.     if (!pb) {

  243.         av_free(buffer);

  244.         av_free(wf->sectors);

  245.         av_free(wf);

  246.     }

  247.     return pb;

  248. }

  249. 

  250. static const ff_asf_guid dir_entry_guid =

  251.     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};

  252. 

  253. /**

  254.  * Open file using filename

  255.  * @param[in]  buf       directory buffer

  256.  * @param      buf_size  directory buffer size

  257.  * @param[in]  filename

  258.  * @param      filename_size size of filename

  259.  * @return NULL on error

  260.  */

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

  262. {

  263.     const uint8_t *buf_end = buf + buf_size;

  264. 

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

  266.         int dir_length, name_size, first_sector, depth;

  267.         uint64_t file_length;

  268.         const uint8_t *name;

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

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

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

  272.             break;

  273.         }

  274.         dir_length  = AV_RL16(buf + 16);

  275.         file_length = AV_RL64(buf + 24);

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

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

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

  279.             break;

  280.         }

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

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

  283. 

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

  285.         name = buf + 40;

  286.         if (name_size >= filename_size &&

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

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

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

  290. 

  291.         buf += dir_length;

  292.     }

  293.     return 0;

  294. }

  295. 

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

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

  298. 

  299. /**

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

  301.  */

  302. static void wtvfile_close(AVIOContext *pb)

  303. {

  304.     WtvFile *wf = pb->opaque;

  305.     av_free(wf->sectors);

  306.     av_free(wf);

  307.     av_free(pb->buffer);

  308.     av_free(pb);

  309. }

  310. 

  311. /*

  312.  *

  313.  * Main demuxer

  314.  *

  315.  */

  316. 

  317. typedef struct {

  318.     int seen_data;

  319. } WtvStream;

  320. 

  321. typedef struct {

  322.     AVIOContext *pb;       /** timeline file */

  323.     int64_t epoch;

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

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

  326. 

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

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

  329.     AVIndexEntry *index_entries;

  330.     int nb_index_entries;

  331.     unsigned int index_entries_allocated_size;

  332. } WtvContext;

  333. 

  334. typedef struct {

  335.     enum AVCodecID id;

  336.     ff_asf_guid guid;

  337. } AVCodecGuid;

  338. 

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

  340. {

  341.     int i;

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

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

  344.             return guids[i].id;

  345.     }

  346.     return AV_CODEC_ID_NONE;

  347. }

  348. 

  349. /* WTV GUIDs */

  350. static const ff_asf_guid wtv_guid =

  351.     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  352. static const ff_asf_guid metadata_guid =

  353.     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};

  354. static const ff_asf_guid timestamp_guid =

  355.     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};

  356. static const ff_asf_guid data_guid =

  357.     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  358. static const ff_asf_guid stream_guid =

  359.     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};

  360. static const ff_asf_guid stream2_guid =

  361.     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  362. static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

  363.     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};

  364. static const ff_asf_guid EVENTID_LanguageSpanningEvent =

  365.     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};

  366. static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

  367.     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};

  368. static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

  369.     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};

  370. static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

  371.     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};

  372. static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =

  373.     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};

  374. static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

  375.     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};

  376. static const ff_asf_guid EVENTID_TeletextSpanningEvent =

  377.     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};

  378. static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =

  379.     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};

  380. 

  381. /* Windows media GUIDs */

  382. 

  383. #define MEDIASUBTYPE_BASE_GUID \

  384.     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71

  385. 

  386. /* Media types */

  387. static const ff_asf_guid mediatype_audio =

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

  389. static const ff_asf_guid mediatype_video =

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

  391. static const ff_asf_guid mediasubtype_mpeg1payload =

  392.     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};

  393. static const ff_asf_guid mediatype_mpeg2_sections =

  394.     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};

  395. static const ff_asf_guid mediatype_mpeg2_pes =

  396.     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  397. static const ff_asf_guid mediatype_mstvcaption =

  398.     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};

  399. 

  400. /* Media subtypes */

  401. static const ff_asf_guid mediasubtype_cpfilters_processed =

  402.     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};

  403. static const ff_asf_guid mediasubtype_dvb_subtitle =

  404.     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};

  405. static const ff_asf_guid mediasubtype_teletext =

  406.     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  407. static const ff_asf_guid mediasubtype_dtvccdata =

  408.     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};

  409. static const ff_asf_guid mediasubtype_mpeg2_sections =

  410.     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};

  411. 

  412. /* Formats */

  413. static const ff_asf_guid format_cpfilters_processed =

  414.     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};

  415. static const ff_asf_guid format_waveformatex =

  416.     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};

  417. static const ff_asf_guid format_videoinfo2 =

  418.     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  419. static const ff_asf_guid format_mpeg2_video =

  420.     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  421. static const ff_asf_guid format_none =

  422.     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};

  423. 

  424. static const AVCodecGuid video_guids[] = {

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

  426.     {AV_CODEC_ID_NONE}

  427. };

  428. 

  429. static const AVCodecGuid audio_guids[] = {

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

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

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

  433.     {AV_CODEC_ID_NONE}

  434. };

  435. 

  436. static int read_probe(AVProbeData *p)

  437. {

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

  439. }

  440. 

  441. /**

  442.  * Convert win32 FILETIME to ISO-8601 string

  443.  */

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

  445. {

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

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

  448.     if (tm)

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

  450.     else

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

  452. }

  453. 

  454. /**

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

  456.  */

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

  458. {

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

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

  461.     if (tm)

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

  463.     else

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

  465. }

  466. 

  467. /**

  468.  * Convert OLE DATE to ISO-8601 string

  469.  */

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

  471. {

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

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

  474.     if (tm)

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

  476.     else

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

  478. }

  479. 

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

  481. {

  482.     char mime[1024];

  483.     char description[1024];

  484.     unsigned int filesize;

  485.     AVStream *st;

  486.     int64_t pos = avio_tell(pb);

  487. 

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

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

  490.         goto done;

  491. 

  492.     avio_r8(pb);

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

  494.     filesize = avio_rl32(pb);

  495.     if (!filesize)

  496.         goto done;

  497. 

  498.     st = avformat_new_stream(s, NULL);

  499.     if (!st)

  500.         goto done;

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

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

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

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

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

  506.         goto done;

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

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

  509. done:

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

  511. }

  512. 

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

  514. {

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

  516.     char *buf = av_malloc(buf_size);

  517.     if (!buf)

  518.         return;

  519. 

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

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

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

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

  524.         if (!strlen(buf)) {

  525.            av_free(buf);

  526.            return;

  527.         }

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

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

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

  531.         int64_t num = avio_rl64(pb);

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

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

  534.             filetime_to_iso8601(buf, buf_size, num);

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

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

  537.             crazytime_to_iso8601(buf, buf_size, num);

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

  539.             oledate_to_iso8601(buf, buf_size, num);

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

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

  542.         else

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

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

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

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

  547.         ff_asf_guid guid;

  548.         avio_read(pb, guid, 16);

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

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

  551.         get_attachment(s, pb, length);

  552.         av_freep(&buf);

  553.         return;

  554.     } else {

  555.         av_freep(&buf);

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

  557.         avio_skip(pb, length);

  558.         return;

  559.     }

  560. 

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

  562.     av_freep(&buf);

  563. }

  564. 

  565. /**

  566.  * Parse metadata entries

  567.  */

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

  569. {

  570.     ff_asf_guid guid;

  571.     int length, type;

  572.     while(!pb->eof_reached) {

  573.         char key[1024];

  574.         ff_get_guid(pb, &guid);

  575.         type   = avio_rl32(pb);

  576.         length = avio_rl32(pb);

  577.         if (!length)

  578.             break;

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

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

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

  582.             break;

  583.         }

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

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

  586.     }

  587. 

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

  589. }

  590. 

  591. /**

  592.  * parse VIDEOINFOHEADER2 structure

  593.  * @return bytes consumed

  594.  */

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

  596. {

  597.     WtvContext *wtv = s->priv_data;

  598.     AVIOContext *pb = wtv->pb;

  599. 

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

  601.     ff_get_bmp_header(pb, st);

  602. 

  603.     return 72 + 40;

  604. }

  605. 

  606. /**

  607.  * Parse MPEG1WAVEFORMATEX extradata structure

  608.  */

  609. static void parse_mpeg1waveformatex(AVStream *st)

  610. {

  611.     /* fwHeadLayer */

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

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

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

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

  616.     }

  617. 

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

  619. 

  620.     /* dwHeadMode */

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

  622.     case 1 :

  623.     case 2 :

  624.     case 4 : st->codec->channels       = 2;

  625.              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

  626.              break;

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

  628.              st->codec->channel_layout = AV_CH_LAYOUT_MONO;

  629.              break;

  630.     }

  631. }

  632. 

  633. /**

  634.  * Initialise stream

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

  636.  * @return NULL on error

  637.  */

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

  639. {

  640.     if (st) {

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

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

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

  644.         }

  645.     } else {

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

  647.         if (!wst)

  648.             return NULL;

  649.         st = avformat_new_stream(s, NULL);

  650.         if (!st)

  651.             return NULL;

  652.         st->id = sid;

  653.         st->priv_data = wst;

  654.     }

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

  656.     st->need_parsing      = AVSTREAM_PARSE_FULL;

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

  658.     return st;

  659. }

  660. 

  661. /**

  662.  * parse Media Type structure and populate stream

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

  664.  * @param mediatype  Mediatype GUID

  665.  * @param subtype    Subtype GUID

  666.  * @param formattype Format GUID

  667.  * @param size       Size of format buffer

  668.  * @return NULL on error

  669.  */

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

  671.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  672.                                    ff_asf_guid formattype, int size)

  673. {

  674.     WtvContext *wtv = s->priv_data;

  675.     AVIOContext *pb = wtv->pb;

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

  677.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  678.         ff_asf_guid actual_subtype;

  679.         ff_asf_guid actual_formattype;

  680. 

  681.         if (size < 32) {

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

  683.             avio_skip(pb, size);

  684.             return NULL;

  685.         }

  686. 

  687.         avio_skip(pb, size - 32);

  688.         ff_get_guid(pb, &actual_subtype);

  689.         ff_get_guid(pb, &actual_formattype);

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

  691. 

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

  693.         avio_skip(pb, 32);

  694.         return st;

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

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

  697.         if (!st)

  698.             return NULL;

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

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

  701.             if (ret < 0)

  702.                 return NULL;

  703.         } else {

  704.             if (ff_guidcmp(formattype, format_none))

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

  706.             avio_skip(pb, size);

  707.         }

  708. 

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

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

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

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

  713.                 parse_mpeg1waveformatex(st);

  714.             else

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

  716.         } else {

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

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

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

  720.         }

  721.         return st;

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

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

  724.         if (!st)

  725.             return NULL;

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

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

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

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

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

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

  732.         } else {

  733.             if (ff_guidcmp(formattype, format_none))

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

  735.             avio_skip(pb, size);

  736.         }

  737. 

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

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

  740.         } else {

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

  742.         }

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

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

  745.         return st;

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

  747.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

  749.         if (!st)

  750.             return NULL;

  751.         if (ff_guidcmp(formattype, format_none))

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

  753.         avio_skip(pb, size);

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

  755.         return st;

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

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

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

  759.         if (!st)

  760.             return NULL;

  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.         st->codec->codec_id   = AV_CODEC_ID_DVB_TELETEXT;

  765.         return st;

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

  767.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  768.         if (ff_guidcmp(formattype, format_none))

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

  770.         avio_skip(pb, size);

  771.         return NULL;

  772.     }

  773. 

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

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

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

  777.     avio_skip(pb, size);

  778.     return NULL;

  779. }

  780. 

  781. enum {

  782.     SEEK_TO_DATA = 0,

  783.     SEEK_TO_PTS,

  784. };

  785. 

  786. /**

  787.  * Parse WTV chunks

  788.  * @param mode SEEK_TO_DATA or SEEK_TO_PTS

  789.  * @param seekts timestamp

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

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

  792.  */

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

  794. {

  795.     WtvContext *wtv = s->priv_data;

  796.     AVIOContext *pb = wtv->pb;

  797.     while (!pb->eof_reached) {

  798.         ff_asf_guid g;

  799.         int len, sid, consumed;

  800. 

  801.         ff_get_guid(pb, &g);

  802.         len = avio_rl32(pb);

  803.         if (len < 32)

  804.             break;

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

  806.         avio_skip(pb, 8);

  807.         consumed = 32;

  808. 

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

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

  811.                 ff_asf_guid mediatype, subtype, formattype;

  812.                 int size;

  813.                 avio_skip(pb, 28);

  814.                 ff_get_guid(pb, &mediatype);

  815.                 ff_get_guid(pb, &subtype);

  816.                 avio_skip(pb, 12);

  817.                 ff_get_guid(pb, &formattype);

  818.                 size = avio_rl32(pb);

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

  820.                 consumed += 92 + size;

  821.             }

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

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

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

  825.                 ff_asf_guid mediatype, subtype, formattype;

  826.                 int size;

  827.                 avio_skip(pb, 12);

  828.                 ff_get_guid(pb, &mediatype);

  829.                 ff_get_guid(pb, &subtype);

  830.                 avio_skip(pb, 12);

  831.                 ff_get_guid(pb, &formattype);

  832.                 size = avio_rl32(pb);

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

  834.                 consumed += 76 + size;

  835.             }

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

  837.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  838.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  839.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  840.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  841.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

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

  843.             if (stream_index >= 0) {

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

  845.                 uint8_t buf[258];

  846.                 const uint8_t *pbuf = buf;

  847.                 int buf_size;

  848. 

  849.                 avio_skip(pb, 8);

  850.                 consumed += 8;

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

  852.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  853.                     avio_skip(pb, 6);

  854.                     consumed += 6;

  855.                 }

  856. 

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

  858.                 avio_read(pb, buf, buf_size);

  859.                 consumed += buf_size;

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

  861.             }

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

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

  864.             if (stream_index >= 0) {

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

  866.                 int audio_type;

  867.                 avio_skip(pb, 8);

  868.                 audio_type = avio_r8(pb);

  869.                 if (audio_type == 2)

  870.                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

  871.                 else if (audio_type == 3)

  872.                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  873.                 consumed += 9;

  874.             }

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

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

  877.             if (stream_index >= 0) {

  878.                 avio_skip(pb, 12);

  879.                 if (avio_rl32(pb))

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

  881.                 consumed += 16;

  882.             }

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

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

  885.             if (stream_index >= 0) {

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

  887.                 uint8_t language[4];

  888.                 avio_skip(pb, 12);

  889.                 avio_read(pb, language, 3);

  890.                 if (language[0]) {

  891.                     language[3] = 0;

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

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

  894.                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  895.                 }

  896.                 consumed += 15;

  897.             }

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

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

  900.             if (stream_index >= 0) {

  901.                 avio_skip(pb, 8);

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

  903.                 consumed += 16;

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

  905.                     wtv->pts = AV_NOPTS_VALUE;

  906.                 else {

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

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

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

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

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

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

  913.                     return 0;

  914.                 }

  915.                 }

  916.             }

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

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

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

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

  921.                 wst->seen_data = 1;

  922.                 if (len_ptr) {

  923.                     *len_ptr = len;

  924.                 }

  925.                 return stream_index;

  926.             }

  927.         } else if (

  928.             !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}) ||

  929.             !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}) ||

  930.             !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}) ||

  931.             !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}) ||

  932.             !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}) ||

  933.             !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}) ||

  934.             !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}) ||

  935.             !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}) ||

  936.             !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}) ||

  937.             !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}) ||

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

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

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

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

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

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

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

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

  946.             //ignore known guids

  947.         } else

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

  949. 

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

  951.     }

  952.     return AVERROR_EOF;

  953. }

  954. 

  955. /* declare utf16le strings */

  956. #define _ , 0,

  957. static const uint8_t timeline_le16[] =

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

  959. static const uint8_t table_0_entries_legacy_attrib_le16[] =

  960.     {'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};

  961. static const uint8_t table_0_entries_time_le16[] =

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

  963. static const uint8_t timeline_table_0_entries_Events_le16[] =

  964.     {'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};

  965. #undef _

  966. 

  967. static int read_header(AVFormatContext *s)

  968. {

  969.     WtvContext *wtv = s->priv_data;

  970.     int root_sector, root_size;

  971.     uint8_t root[WTV_SECTOR_SIZE];

  972.     AVIOContext *pb;

  973.     int64_t timeline_pos;

  974.     int ret;

  975. 

  976.     wtv->epoch          =

  977.     wtv->pts            =

  978.     wtv->last_valid_pts = AV_NOPTS_VALUE;

  979. 

  980.     /* read root directory sector */

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

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

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

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

  985.         return AVERROR_INVALIDDATA;

  986.     }

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

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

  989. 

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

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

  992.     if (root_size < 0)

  993.         return AVERROR_INVALIDDATA;

  994. 

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

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

  997.     if (!wtv->pb) {

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

  999.         return AVERROR_INVALIDDATA;

  1000.     }

  1001. 

  1002.     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);

  1003.     if (ret < 0)

  1004.         return ret;

  1005.     avio_seek(wtv->pb, -32, SEEK_CUR);

  1006. 

  1007.     timeline_pos = avio_tell(s->pb); // save before opening another file

  1008. 

  1009.     /* read metadata */

  1010.     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);

  1011.     if (pb) {

  1012.         parse_legacy_attrib(s, pb);

  1013.         wtvfile_close(pb);

  1014.     }

  1015. 

  1016.     /* read seek index */

  1017.     if (s->nb_streams) {

  1018.         AVStream *st = s->streams[0];

  1019.         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);

  1020.         if (pb) {

  1021.             while(1) {

  1022.                 uint64_t timestamp = avio_rl64(pb);

  1023.                 uint64_t frame_nb  = avio_rl64(pb);

  1024.                 if (pb->eof_reached)

  1025.                     break;

  1026.                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,

  1027.                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

  1028.             }

  1029.             wtvfile_close(pb);

  1030. 

  1031.             if (wtv->nb_index_entries) {

  1032.                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);

  1033.                 if (pb) {

  1034.                     int i;

  1035.                     while (1) {

  1036.                         uint64_t frame_nb = avio_rl64(pb);

  1037.                         uint64_t position = avio_rl64(pb);

  1038.                         if (pb->eof_reached)

  1039.                             break;

  1040.                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {

  1041.                             AVIndexEntry *e = wtv->index_entries + i;

  1042.                             if (frame_nb > e->size)

  1043.                                 break;

  1044.                             if (position > e->pos)

  1045.                                 e->pos = position;

  1046.                         }

  1047.                     }

  1048.                     wtvfile_close(pb);

  1049.                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;

  1050.                 }

  1051.             }

  1052.         }

  1053.     }

  1054. 

  1055.     avio_seek(s->pb, timeline_pos, SEEK_SET);

  1056.     return 0;

  1057. }

  1058. 

  1059. static int read_packet(AVFormatContext *s, AVPacket *pkt)

  1060. {

  1061.     WtvContext *wtv = s->priv_data;

  1062.     AVIOContext *pb = wtv->pb;

  1063.     int stream_index, len, ret;

  1064. 

  1065.     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);

  1066.     if (stream_index < 0)

  1067.         return stream_index;

  1068. 

  1069.     ret = av_get_packet(pb, pkt, len - 32);

  1070.     if (ret < 0)

  1071.         return ret;

  1072.     pkt->stream_index = stream_index;

  1073.     pkt->pts          = wtv->pts;

  1074.     avio_skip(pb, WTV_PAD8(len) - len);

  1075.     return 0;

  1076. }

  1077. 

  1078. static int read_seek(AVFormatContext *s, int stream_index,

  1079.                      int64_t ts, int flags)

  1080. {

  1081.     WtvContext *wtv = s->priv_data;

  1082.     AVIOContext *pb = wtv->pb;

  1083.     AVStream *st = s->streams[0];

  1084.     int64_t ts_relative;

  1085.     int i;

  1086. 

  1087.     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

  1088.         return AVERROR(ENOSYS);

  1089. 

  1090.     /* timestamp adjustment is required because wtv->pts values are absolute,

  1091.      * whereas AVIndexEntry->timestamp values are relative to epoch. */

  1092.     ts_relative = ts;

  1093.     if (wtv->epoch != AV_NOPTS_VALUE)

  1094.         ts_relative -= wtv->epoch;

  1095. 

  1096.     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

  1097.     if (i < 0) {

  1098.         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

  1099.             avio_seek(pb, 0, SEEK_SET);

  1100.         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

  1101.             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

  1102.         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)

  1103.             return AVERROR(ERANGE);

  1104.         return 0;

  1105.     }

  1106.     wtv->pts = wtv->index_entries[i].timestamp;

  1107.     if (wtv->epoch != AV_NOPTS_VALUE)

  1108.         wtv->pts += wtv->epoch;

  1109.     wtv->last_valid_pts = wtv->pts;

  1110.     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);

  1111.     return 0;

  1112. }

  1113. 

  1114. static int read_close(AVFormatContext *s)

  1115. {

  1116.     WtvContext *wtv = s->priv_data;

  1117.     av_free(wtv->index_entries);

  1118.     wtvfile_close(wtv->pb);

  1119.     return 0;

  1120. }

  1121. 

  1122. AVInputFormat ff_wtv_demuxer = {

  1123.     .name           = "wtv",

  1124.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),

  1125.     .priv_data_size = sizeof(WtvContext),

  1126.     .read_probe     = read_probe,

  1127.     .read_header    = read_header,

  1128.     .read_packet    = read_packet,

  1129.     .read_seek      = read_seek,

  1130.     .read_close     = read_close,

  1131.     .flags          = AVFMT_SHOW_IDS,

  1132. };