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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/intreadwrite.h"

  29. #include "libavutil/intfloat_readwrite.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. #include <strings.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(pb);

  307. }

  308. 

  309. /*

  310.  *

  311.  * Main demuxer

  312.  *

  313.  */

  314. 

  315. typedef struct {

  316.     int seen_data;

  317. } WtvStream;

  318. 

  319. typedef struct {

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

  321.     int64_t epoch;

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

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

  324. 

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

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

  327.     AVIndexEntry *index_entries;

  328.     int nb_index_entries;

  329.     unsigned int index_entries_allocated_size;

  330. } WtvContext;

  331. 

  332. typedef struct {

  333.     enum CodecID id;

  334.     ff_asf_guid guid;

  335. } AVCodecGuid;

  336. 

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

  338. {

  339.     int i;

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

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

  342.             return guids[i].id;

  343.     }

  344.     return CODEC_ID_NONE;

  345. }

  346. 

  347. /* WTV GUIDs */

  348. static const ff_asf_guid wtv_guid =

  349.     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  350. static const ff_asf_guid metadata_guid =

  351.     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};

  352. static const ff_asf_guid timestamp_guid =

  353.     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};

  354. static const ff_asf_guid data_guid =

  355.     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  356. static const ff_asf_guid stream_guid =

  357.     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};

  358. static const ff_asf_guid stream2_guid =

  359.     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  360. static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

  361.     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};

  362. static const ff_asf_guid EVENTID_LanguageSpanningEvent =

  363.     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};

  364. static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

  365.     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};

  366. static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

  367.     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};

  368. static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

  369.     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};

  370. static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =

  371.     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};

  372. static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

  373.     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};

  374. static const ff_asf_guid EVENTID_TeletextSpanningEvent =

  375.     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};

  376. static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =

  377.     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};

  378. 

  379. /* Windows media GUIDs */

  380. 

  381. #define MEDIASUBTYPE_BASE_GUID \

  382.     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71

  383. 

  384. /* Media types */

  385. static const ff_asf_guid mediatype_audio =

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

  387. static const ff_asf_guid mediatype_video =

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

  389. static const ff_asf_guid mediasubtype_mpeg1payload =

  390.     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};

  391. static const ff_asf_guid mediatype_mpeg2_sections =

  392.     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};

  393. static const ff_asf_guid mediatype_mpeg2_pes =

  394.     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  395. static const ff_asf_guid mediatype_mstvcaption =

  396.     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};

  397. 

  398. /* Media subtypes */

  399. static const ff_asf_guid mediasubtype_cpfilters_processed =

  400.     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};

  401. static const ff_asf_guid mediasubtype_dvb_subtitle =

  402.     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};

  403. static const ff_asf_guid mediasubtype_teletext =

  404.     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  405. static const ff_asf_guid mediasubtype_dtvccdata =

  406.     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};

  407. static const ff_asf_guid mediasubtype_mpeg2_sections =

  408.     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};

  409. 

  410. /* Formats */

  411. static const ff_asf_guid format_cpfilters_processed =

  412.     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};

  413. static const ff_asf_guid format_waveformatex =

  414.     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};

  415. static const ff_asf_guid format_videoinfo2 =

  416.     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  417. static const ff_asf_guid format_mpeg2_video =

  418.     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  419. static const ff_asf_guid format_none =

  420.     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};

  421. 

  422. static const AVCodecGuid video_guids[] = {

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

  424.     {CODEC_ID_NONE}

  425. };

  426. 

  427. static const AVCodecGuid audio_guids[] = {

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

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

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

  431.     {CODEC_ID_NONE}

  432. };

  433. 

  434. static int read_probe(AVProbeData *p)

  435. {

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

  437. }

  438. 

  439. /**

  440.  * Convert win32 FILETIME to ISO-8601 string

  441.  */

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

  443. {

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

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

  446. }

  447. 

  448. /**

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

  450.  */

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

  452. {

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

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

  455. }

  456. 

  457. /**

  458.  * Convert OLE DATE to ISO-8601 string

  459.  */

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

  461. {

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

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

  464. }

  465. 

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

  467. {

  468.     char mime[1024];

  469.     char description[1024];

  470.     unsigned int filesize;

  471.     AVStream *st;

  472.     int64_t pos = avio_tell(pb);

  473. 

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

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

  476.         goto done;

  477. 

  478.     avio_r8(pb);

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

  480.     filesize = avio_rl32(pb);

  481.     if (!filesize)

  482.         goto done;

  483. 

  484.     st = av_new_stream(s, 0);

  485.     if (!st)

  486.         goto done;

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

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

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

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

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

  492.         goto done;

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

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

  495. done:

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

  497. }

  498. 

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

  500. {

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

  502.     char *buf = av_malloc(buf_size);

  503.     if (!buf)

  504.         return;

  505. 

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

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

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

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

  510.         if (!strlen(buf)) {

  511.            av_free(buf);

  512.            return;

  513.         }

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

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

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

  517.         int64_t num = avio_rl64(pb);

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

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

  520.             filetime_to_iso8601(buf, buf_size, num);

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

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

  523.             crazytime_to_iso8601(buf, buf_size, num);

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

  525.             oledate_to_iso8601(buf, buf_size, num);

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

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

  528.         else

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

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

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

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

  533.         ff_asf_guid guid;

  534.         avio_read(pb, guid, 16);

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

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

  537.         get_attachment(s, pb, length);

  538.         av_freep(&buf);

  539.         return;

  540.     } else {

  541.         av_freep(&buf);

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

  543.         avio_skip(pb, length);

  544.         return;

  545.     }

  546. 

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

  548.     av_freep(&buf);

  549. }

  550. 

  551. /**

  552.  * Parse metadata entries

  553.  */

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

  555. {

  556.     ff_asf_guid guid;

  557.     int length, type;

  558.     while(!pb->eof_reached) {

  559.         char key[1024];

  560.         ff_get_guid(pb, &guid);

  561.         type   = avio_rl32(pb);

  562.         length = avio_rl32(pb);

  563.         if (!length)

  564.             break;

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

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

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

  568.             break;

  569.         }

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

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

  572.     }

  573. 

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

  575. }

  576. 

  577. /**

  578.  * parse VIDEOINFOHEADER2 structure

  579.  * @return bytes consumed

  580.  */

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

  582. {

  583.     WtvContext *wtv = s->priv_data;

  584.     AVIOContext *pb = wtv->pb;

  585. 

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

  587.     ff_get_bmp_header(pb, st);

  588. 

  589.     return 72 + 40;

  590. }

  591. 

  592. /**

  593.  * Parse MPEG1WAVEFORMATEX extradata structure

  594.  */

  595. static void parse_mpeg1waveformatex(AVStream *st)

  596. {

  597.     /* fwHeadLayer */

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

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

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

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

  602.     }

  603. 

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

  605. 

  606.     /* dwHeadMode */

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

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

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

  610.     }

  611. }

  612. 

  613. /**

  614.  * Initialise stream

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

  616.  * @return NULL on error

  617.  */

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

  619. {

  620.     if (st) {

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

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

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

  624.         }

  625.     } else {

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

  627.         if (!wst)

  628.             return NULL;

  629.         st = av_new_stream(s, sid);

  630.         if (!st)

  631.             return NULL;

  632.         st->priv_data = wst;

  633.     }

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

  635.     st->need_parsing      = AVSTREAM_PARSE_FULL;

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

  637.     return st;

  638. }

  639. 

  640. /**

  641.  * parse Media Type structure and populate stream

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

  643.  * @param mediatype  Mediatype GUID

  644.  * @param subtype    Subtype GUID

  645.  * @param formattype Format GUID

  646.  * @param size       Size of format buffer

  647.  * @return NULL on error

  648.  */

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

  650.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  651.                                    ff_asf_guid formattype, int size)

  652. {

  653.     WtvContext *wtv = s->priv_data;

  654.     AVIOContext *pb = wtv->pb;

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

  656.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  657.         ff_asf_guid actual_subtype;

  658.         ff_asf_guid actual_formattype;

  659. 

  660.         if (size < 32) {

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

  662.             avio_skip(pb, size);

  663.             return NULL;

  664.         }

  665. 

  666.         avio_skip(pb, size - 32);

  667.         ff_get_guid(pb, &actual_subtype);

  668.         ff_get_guid(pb, &actual_formattype);

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

  670. 

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

  672.         avio_skip(pb, 32);

  673.         return st;

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

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

  676.         if (!st)

  677.             return NULL;

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

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

  680.             if (ret < 0)

  681.                 return NULL;

  682.         } else {

  683.             if (ff_guidcmp(formattype, format_none))

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

  685.             avio_skip(pb, size);

  686.         }

  687. 

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

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

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

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

  692.                 parse_mpeg1waveformatex(st);

  693.             else

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

  695.         } else {

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

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

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

  699.         }

  700.         return st;

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

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

  703.         if (!st)

  704.             return NULL;

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

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

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

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

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

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

  711.         } else {

  712.             if (ff_guidcmp(formattype, format_none))

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

  714.             avio_skip(pb, size);

  715.         }

  716. 

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

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

  719.         } else {

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

  721.         }

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

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

  724.         return st;

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

  726.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

  728.         if (!st)

  729.             return NULL;

  730.         if (ff_guidcmp(formattype, format_none))

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

  732.         avio_skip(pb, size);

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

  734.         return st;

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

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

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

  738.         if (!st)

  739.             return NULL;

  740.         if (ff_guidcmp(formattype, format_none))

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

  742.         avio_skip(pb, size);

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

  744.         return st;

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

  746.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  747.         if (ff_guidcmp(formattype, format_none))

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

  749.         avio_skip(pb, size);

  750.         return NULL;

  751.     }

  752. 

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

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

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

  756.     avio_skip(pb, size);

  757.     return NULL;

  758. }

  759. 

  760. enum {

  761.     SEEK_TO_DATA = 0,

  762.     SEEK_TO_PTS,

  763. };

  764. 

  765. /**

  766.  * Parse WTV chunks

  767.  * @param mode SEEK_TO_DATA or SEEK_TO_PTS

  768.  * @param seekts timestamp

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

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

  771.  */

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

  773. {

  774.     WtvContext *wtv = s->priv_data;

  775.     AVIOContext *pb = wtv->pb;

  776.     while (!pb->eof_reached) {

  777.         ff_asf_guid g;

  778.         int len, sid, consumed;

  779. 

  780.         ff_get_guid(pb, &g);

  781.         len = avio_rl32(pb);

  782.         if (len < 32)

  783.             break;

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

  785.         avio_skip(pb, 8);

  786.         consumed = 32;

  787. 

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

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

  790.                 ff_asf_guid mediatype, subtype, formattype;

  791.                 int size;

  792.                 avio_skip(pb, 28);

  793.                 ff_get_guid(pb, &mediatype);

  794.                 ff_get_guid(pb, &subtype);

  795.                 avio_skip(pb, 12);

  796.                 ff_get_guid(pb, &formattype);

  797.                 size = avio_rl32(pb);

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

  799.                 consumed += 92 + size;

  800.             }

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

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

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

  804.                 ff_asf_guid mediatype, subtype, formattype;

  805.                 int size;

  806.                 avio_skip(pb, 12);

  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, s->streams[stream_index], sid, mediatype, subtype, formattype, size);

  813.                 consumed += 76 + size;

  814.             }

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

  816.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  817.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  818.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  819.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  820.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

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

  822.             if (stream_index >= 0) {

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

  824.                 uint8_t buf[258];

  825.                 const uint8_t *pbuf = buf;

  826.                 int buf_size;

  827. 

  828.                 avio_skip(pb, 8);

  829.                 consumed += 8;

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

  831.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  832.                     avio_skip(pb, 6);

  833.                     consumed += 6;

  834.                 }

  835. 

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

  837.                 avio_read(pb, buf, buf_size);

  838.                 consumed += buf_size;

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

  840.             }

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

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

  843.             if (stream_index >= 0) {

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

  845.                 int audio_type;

  846.                 avio_skip(pb, 8);

  847.                 audio_type = avio_r8(pb);

  848.                 if (audio_type == 2)

  849.                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

  850.                 else if (audio_type == 3)

  851.                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  852.                 consumed += 9;

  853.             }

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

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

  856.             if (stream_index >= 0) {

  857.                 avio_skip(pb, 12);

  858.                 if (avio_rl32(pb))

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

  860.                 consumed += 16;

  861.             }

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

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

  864.             if (stream_index >= 0) {

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

  866.                 uint8_t language[4];

  867.                 avio_skip(pb, 12);

  868.                 avio_read(pb, language, 3);

  869.                 if (language[0]) {

  870.                     language[3] = 0;

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

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

  873.                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  874.                 }

  875.                 consumed += 15;

  876.             }

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

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

  879.             if (stream_index >= 0) {

  880.                 avio_skip(pb, 8);

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

  882.                 consumed += 16;

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

  884.                     wtv->pts = AV_NOPTS_VALUE;

  885.                 else {

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

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

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

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

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

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

  892.                     return 0;

  893.                 }

  894.                 }

  895.             }

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

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

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

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

  900.                 wst->seen_data = 1;

  901.                 if (len_ptr) {

  902.                     *len_ptr = len;

  903.                 }

  904.                 return stream_index;

  905.             }

  906.         } else if (

  907.             !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}) ||

  908.             !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}) ||

  909.             !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}) ||

  910.             !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}) ||

  911.             !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}) ||

  912.             !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}) ||

  913.             !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}) ||

  914.             !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}) ||

  915.             !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}) ||

  916.             !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}) ||

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

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

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

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

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

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

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

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

  925.             //ignore known guids

  926.         } else

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

  928. 

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

  930.     }

  931.     return AVERROR_EOF;

  932. }

  933. 

  934. /* declare utf16le strings */

  935. #define _ , 0,

  936. static const uint8_t timeline_le16[] =

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

  938. static const uint8_t table_0_entries_legacy_attrib_le16[] =

  939.     {'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};

  940. static const uint8_t table_0_entries_time_le16[] =

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

  942. static const uint8_t timeline_table_0_entries_Events_le16[] =

  943.     {'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};

  944. #undef _

  945. 

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

  947. {

  948.     WtvContext *wtv = s->priv_data;

  949.     int root_sector, root_size;

  950.     uint8_t root[WTV_SECTOR_SIZE];

  951.     AVIOContext *pb;

  952.     int64_t timeline_pos;

  953.     int ret;

  954. 

  955.     wtv->epoch          =

  956.     wtv->pts            =

  957.     wtv->last_valid_pts = AV_NOPTS_VALUE;

  958. 

  959.     /* read root directory sector */

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

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

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

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

  964.         return AVERROR_INVALIDDATA;

  965.     }

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

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

  968. 

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

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

  971.     if (root_size < 0)

  972.         return AVERROR_INVALIDDATA;

  973. 

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

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

  976.     if (!wtv->pb) {

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

  978.         return AVERROR_INVALIDDATA;

  979.     }

  980. 

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

  982.     if (ret < 0)

  983.         return ret;

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

  985. 

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

  987. 

  988.     /* read metadata */

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

  990.     if (pb) {

  991.         parse_legacy_attrib(s, pb);

  992.         wtvfile_close(pb);

  993.     }

  994. 

  995.     /* read seek index */

  996.     if (s->nb_streams) {

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

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

  999.         if (pb) {

  1000.             while(1) {

  1001.                 uint64_t timestamp = avio_rl64(pb);

  1002.                 uint64_t frame_nb  = avio_rl64(pb);

  1003.                 if (pb->eof_reached)

  1004.                     break;

  1005.                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,

  1006.                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

  1007.             }

  1008.             wtvfile_close(pb);

  1009. 

  1010.             if (wtv->nb_index_entries) {

  1011.                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);

  1012.                 if (pb) {

  1013.                     int i;

  1014.                     while (1) {

  1015.                         uint64_t frame_nb = avio_rl64(pb);

  1016.                         uint64_t position = avio_rl64(pb);

  1017.                         if (pb->eof_reached)

  1018.                             break;

  1019.                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {

  1020.                             AVIndexEntry *e = wtv->index_entries + i;

  1021.                             if (frame_nb > e->size)

  1022.                                 break;

  1023.                             if (position > e->pos)

  1024.                                 e->pos = position;

  1025.                         }

  1026.                     }

  1027.                     wtvfile_close(pb);

  1028.                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;

  1029.                 }

  1030.             }

  1031.         }

  1032.     }

  1033. 

  1034.     avio_seek(s->pb, timeline_pos, SEEK_SET);

  1035.     return 0;

  1036. }

  1037. 

  1038. static int read_packet(AVFormatContext *s, AVPacket *pkt)

  1039. {

  1040.     WtvContext *wtv = s->priv_data;

  1041.     AVIOContext *pb = wtv->pb;

  1042.     int stream_index, len, ret;

  1043. 

  1044.     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);

  1045.     if (stream_index < 0)

  1046.         return stream_index;

  1047. 

  1048.     ret = av_get_packet(pb, pkt, len - 32);

  1049.     if (ret < 0)

  1050.         return ret;

  1051.     pkt->stream_index = stream_index;

  1052.     pkt->pts          = wtv->pts;

  1053.     avio_skip(pb, WTV_PAD8(len) - len);

  1054.     return 0;

  1055. }

  1056. 

  1057. static int read_seek(AVFormatContext *s, int stream_index,

  1058.                      int64_t ts, int flags)

  1059. {

  1060.     WtvContext *wtv = s->priv_data;

  1061.     AVIOContext *pb = wtv->pb;

  1062.     AVStream *st = s->streams[0];

  1063.     int64_t ts_relative;

  1064.     int i;

  1065. 

  1066.     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

  1067.         return AVERROR(ENOSYS);

  1068. 

  1069.     /* timestamp adjustment is required because wtv->pts values are absolute,

  1070.      * whereas AVIndexEntry->timestamp values are relative to epoch. */

  1071.     ts_relative = ts;

  1072.     if (wtv->epoch != AV_NOPTS_VALUE)

  1073.         ts_relative -= wtv->epoch;

  1074. 

  1075.     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

  1076.     if (i < 0) {

  1077.         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

  1078.             avio_seek(pb, 0, SEEK_SET);

  1079.         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

  1080.             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

  1081.         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)

  1082.             return AVERROR(ERANGE);

  1083.         return 0;

  1084.     }

  1085.     wtv->pts = wtv->index_entries[i].timestamp;

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

  1087.         wtv->pts += wtv->epoch;

  1088.     wtv->last_valid_pts = wtv->pts;

  1089.     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);

  1090.     return 0;

  1091. }

  1092. 

  1093. static int read_close(AVFormatContext *s)

  1094. {

  1095.     WtvContext *wtv = s->priv_data;

  1096.     wtvfile_close(wtv->pb);

  1097.     return 0;

  1098. }

  1099. 

  1100. AVInputFormat ff_wtv_demuxer = {

  1101.     .name           = "wtv",

  1102.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),

  1103.     .priv_data_size = sizeof(WtvContext),

  1104.     .read_probe     = read_probe,

  1105.     .read_header    = read_header,

  1106.     .read_packet    = read_packet,

  1107.     .read_seek      = read_seek,

  1108.     .read_close     = read_close,

  1109.     .flags          = AVFMT_SHOW_IDS,

  1110. };