falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42674 Commits
32 Branches
320MB
Tree: c33c1fa8af
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'c33c1fa8af'
${ noResults }
FFmpeg/libavformat/wtv.c

1129 lines
41KB
Raw Blame History 

  1. /*

  2.  * Windows Television (WTV) demuxer

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * Windows Television (WTV) demuxer

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

  26.  */

  27. 

  28. #include <inttypes.h>

  29. 

  30. #include "libavutil/channel_layout.h"

  31. #include "libavutil/intreadwrite.h"

  32. #include "libavutil/intfloat.h"

  33. #include "libavutil/dict.h"

  34. #include "libavutil/time_internal.h"

  35. #include "avformat.h"

  36. #include "internal.h"

  37. #include "riff.h"

  38. #include "asf.h"

  39. #include "mpegts.h"

  40. 

  41. /* Macros for formating GUIDs */

  42. #define PRI_PRETTY_GUID \

  43.     "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"

  44. #define ARG_PRETTY_GUID(g) \

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

  46. #define LEN_PRETTY_GUID 34

  47. 

  48. /*

  49.  *

  50.  * File system routines

  51.  *

  52.  */

  53. 

  54. #define WTV_SECTOR_BITS    12

  55. #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)

  56. #define WTV_BIGSECTOR_BITS 18

  57. 

  58. #define SHIFT_SECTOR_BITS(a) ((int64_t)(a) << WTV_SECTOR_BITS)

  59. 

  60. typedef struct WtvFile {

  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. static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)

  73. {

  74.     return avio_seek(pb, SHIFT_SECTOR_BITS(sector) + offset, SEEK_SET);

  75. }

  76. 

  77. /**

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

  79.  */

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

  81. {

  82.     WtvFile *wf = opaque;

  83.     AVIOContext *pb = wf->pb_filesystem;

  84.     int nread = 0;

  85. 

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

  87.         return -1;

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

  89.         return 0;

  90. 

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

  92.     while(nread < buf_size) {

  93.         int n;

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

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

  96. 

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

  98.         if (n <= 0)

  99.             break;

  100.         nread += n;

  101.         buf += n;

  102.         wf->position += n;

  103.         if (n == remaining_in_sector) {

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

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

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

  107.                 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {

  108.                 wf->error = 1;

  109.                 break;

  110.             }

  111.         }

  112.     }

  113.     return nread;

  114. }

  115. 

  116. /**

  117.  * @return position (or file length)

  118.  */

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

  120. {

  121.     WtvFile *wf = opaque;

  122.     AVIOContext *pb = wf->pb_filesystem;

  123. 

  124.     if (whence == AVSEEK_SIZE)

  125.         return wf->length;

  126.     else if (whence == SEEK_CUR)

  127.         offset = wf->position + offset;

  128.     else if (whence == SEEK_END)

  129.         offset = wf->length;

  130. 

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

  132.                 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],

  133.                                offset & ((1 << wf->sector_bits) - 1)) < 0;

  134.     wf->position = offset;

  135.     return offset;

  136. }

  137. 

  138. /**

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

  140.  * @param pb

  141.  * @param[out] data destination

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

  143.  * @return    total number of integers read

  144.  */

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

  146. {

  147.     int i, total = 0;

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

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

  150.            total++;

  151.     }

  152.     return total;

  153. }

  154. 

  155. /**

  156.  * Open file

  157.  * @param first_sector  First sector

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

  159.  * @param depth         File allocation table depth

  160.  * @return NULL on error

  161.  */

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

  163. {

  164.     AVIOContext *pb;

  165.     WtvFile *wf;

  166.     uint8_t *buffer;

  167. 

  168.     if (seek_by_sector(s->pb, first_sector, 0) < 0)

  169.         return NULL;

  170. 

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

  172.     if (!wf)

  173.         return NULL;

  174. 

  175.     if (depth == 0) {

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

  177.         if (!wf->sectors) {

  178.             av_free(wf);

  179.             return NULL;

  180.         }

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

  182.         wf->nb_sectors  = 1;

  183.         wf->sector_bits = WTV_SECTOR_BITS;

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

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

  186.         if (!wf->sectors) {

  187.             av_free(wf);

  188.             return NULL;

  189.         }

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

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

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

  193.         uint32_t sectors1[WTV_SECTOR_SIZE / 4];

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

  195.         int i;

  196. 

  197.         wf->sectors = av_malloc(SHIFT_SECTOR_BITS(nb_sectors1));

  198.         if (!wf->sectors) {

  199.             av_free(wf);

  200.             return NULL;

  201.         }

  202.         wf->nb_sectors = 0;

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

  204.             if (seek_by_sector(s->pb, sectors1[i], 0) < 0)

  205.                 break;

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

  207.         }

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

  209.     } else {

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

  211.         av_free(wf);

  212.         return NULL;

  213.     }

  214. 

  215.     if (!wf->nb_sectors) {

  216.         av_free(wf->sectors);

  217.         av_free(wf);

  218.         return NULL;

  219.     }

  220. 

  221.     /* check length */

  222.     length &= 0xFFFFFFFFFFFF;

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

  224.         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);

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

  226.     }

  227.     wf->length = length;

  228. 

  229.     /* seek to initial sector */

  230.     wf->position = 0;

  231.     if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {

  232.         av_free(wf->sectors);

  233.         av_free(wf);

  234.         return NULL;

  235.     }

  236. 

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

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

  239.     if (!buffer) {

  240.         av_free(wf->sectors);

  241.         av_free(wf);

  242.         return NULL;

  243.     }

  244. 

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

  246.                            wtvfile_read_packet, NULL, wtvfile_seek);

  247.     if (!pb) {

  248.         av_free(buffer);

  249.         av_free(wf->sectors);

  250.         av_free(wf);

  251.     }

  252.     return pb;

  253. }

  254. 

  255. static const ff_asf_guid dir_entry_guid =

  256.     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};

  257. 

  258. /**

  259.  * Open file using filename

  260.  * @param[in]  buf       directory buffer

  261.  * @param      buf_size  directory buffer size

  262.  * @param[in]  filename

  263.  * @param      filename_size size of filename

  264.  * @return NULL on error

  265.  */

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

  267. {

  268.     const uint8_t *buf_end = buf + buf_size;

  269. 

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

  271.         int dir_length, name_size, first_sector, depth;

  272.         uint64_t file_length;

  273.         const uint8_t *name;

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

  275.             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "

  276.                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));

  277.             break;

  278.         }

  279.         dir_length  = AV_RL16(buf + 16);

  280.         file_length = AV_RL64(buf + 24);

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

  282.         if (name_size < 0) {

  283.             av_log(s, AV_LOG_ERROR,

  284.                    "bad filename length, remaining directory entries ignored\n");

  285.             break;

  286.         }

  287.         if (48 + name_size > buf_end - buf) {

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

  289.             break;

  290.         }

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

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

  293. 

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

  295.         name = buf + 40;

  296.         if (name_size >= filename_size &&

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

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

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

  300. 

  301.         buf += dir_length;

  302.     }

  303.     return 0;

  304. }

  305. 

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

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

  308. 

  309. /**

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

  311.  */

  312. static void wtvfile_close(AVIOContext *pb)

  313. {

  314.     WtvFile *wf = pb->opaque;

  315.     av_free(wf->sectors);

  316.     av_free(wf);

  317.     av_free(pb->buffer);

  318.     av_free(pb);

  319. }

  320. 

  321. /*

  322.  *

  323.  * Main demuxer

  324.  *

  325.  */

  326. 

  327. typedef struct WtvStream {

  328.     int seen_data;

  329. } WtvStream;

  330. 

  331. typedef struct WtvContext {

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

  333.     int64_t epoch;

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

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

  336. 

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

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

  339.     AVIndexEntry *index_entries;

  340.     int nb_index_entries;

  341.     unsigned int index_entries_allocated_size;

  342. } WtvContext;

  343. 

  344. /* WTV GUIDs */

  345. static const ff_asf_guid wtv_guid =

  346.     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  347. static const ff_asf_guid metadata_guid =

  348.     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};

  349. static const ff_asf_guid timestamp_guid =

  350.     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};

  351. static const ff_asf_guid data_guid =

  352.     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  353. static const ff_asf_guid stream_guid =

  354.     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};

  355. static const ff_asf_guid stream2_guid =

  356.     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  357. static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

  358.     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};

  359. static const ff_asf_guid EVENTID_LanguageSpanningEvent =

  360.     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};

  361. static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

  362.     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};

  363. static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

  364.     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};

  365. static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

  366.     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};

  367. static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =

  368.     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};

  369. static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

  370.     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};

  371. static const ff_asf_guid EVENTID_TeletextSpanningEvent =

  372.     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};

  373. static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =

  374.     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};

  375. 

  376. /* Windows media GUIDs */

  377. 

  378. /* Media types */

  379. static const ff_asf_guid mediatype_audio =

  380.     {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};

  381. static const ff_asf_guid mediatype_video =

  382.     {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};

  383. static const ff_asf_guid mediasubtype_mpeg1payload =

  384.     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};

  385. static const ff_asf_guid mediatype_mpeg2_sections =

  386.     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};

  387. static const ff_asf_guid mediatype_mpeg2_pes =

  388.     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  389. static const ff_asf_guid mediatype_mstvcaption =

  390.     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};

  391. 

  392. /* Media subtypes */

  393. static const ff_asf_guid mediasubtype_cpfilters_processed =

  394.     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};

  395. static const ff_asf_guid mediasubtype_dvb_subtitle =

  396.     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};

  397. static const ff_asf_guid mediasubtype_teletext =

  398.     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  399. static const ff_asf_guid mediasubtype_dtvccdata =

  400.     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};

  401. static const ff_asf_guid mediasubtype_mpeg2_sections =

  402.     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};

  403. 

  404. /* Formats */

  405. static const ff_asf_guid format_cpfilters_processed =

  406.     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};

  407. static const ff_asf_guid format_waveformatex =

  408.     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};

  409. static const ff_asf_guid format_videoinfo2 =

  410.     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  411. static const ff_asf_guid format_mpeg2_video =

  412.     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  413. static const ff_asf_guid format_none =

  414.     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};

  415. 

  416. static const AVCodecGuid video_guids[] = {

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

  418.     {AV_CODEC_ID_NONE}

  419. };

  420. 

  421. static int read_probe(AVProbeData *p)

  422. {

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

  424. }

  425. 

  426. /**

  427.  * Convert win32 FILETIME to ISO-8601 string

  428.  */

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

  430. {

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

  432.     struct tm tmbuf;

  433.     struct tm *tm = gmtime_r(&t, &tmbuf);

  434.     if (tm) {

  435.         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))

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

  437.     } else

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

  439. }

  440. 

  441. /**

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

  443.  */

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

  445. {

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

  447.     struct tm tmbuf;

  448.     struct tm *tm = gmtime_r(&t, &tmbuf);

  449.     if (tm) {

  450.         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))

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

  452.     } else

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

  454. }

  455. 

  456. /**

  457.  * Convert OLE DATE to ISO-8601 string

  458.  */

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

  460. {

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

  462.     struct tm tmbuf;

  463.     struct tm *tm = gmtime_r(&t, &tmbuf);

  464.     if (tm) {

  465.         if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))

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

  467.     } else

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

  469. }

  470. 

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

  472. {

  473.     char mime[1024];

  474.     char description[1024];

  475.     unsigned int filesize;

  476.     AVStream *st;

  477.     int64_t pos = avio_tell(pb);

  478. 

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

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

  481.         goto done;

  482. 

  483.     avio_r8(pb);

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

  485.     filesize = avio_rl32(pb);

  486.     if (!filesize)

  487.         goto done;

  488. 

  489.     st = avformat_new_stream(s, NULL);

  490.     if (!st)

  491.         goto done;

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

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

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

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

  496.     st->id = -1;

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

  498.         goto done;

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

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

  501. done:

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

  503. }

  504. 

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

  506. {

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

  508.     char *buf = av_malloc(buf_size);

  509.     if (!buf)

  510.         return;

  511. 

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

  513.         snprintf(buf, buf_size, "%u", avio_rl32(pb));

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

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

  516.         if (!strlen(buf)) {

  517.            av_free(buf);

  518.            return;

  519.         }

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

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

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

  523.         int64_t num = avio_rl64(pb);

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

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

  526.             filetime_to_iso8601(buf, buf_size, num);

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

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

  529.             crazytime_to_iso8601(buf, buf_size, num);

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

  531.             oledate_to_iso8601(buf, buf_size, num);

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

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

  534.         else

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

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

  537.         snprintf(buf, buf_size, "%u", avio_rl16(pb));

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

  539.         ff_asf_guid guid;

  540.         avio_read(pb, guid, 16);

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

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

  543.         get_attachment(s, pb, length);

  544.         av_freep(&buf);

  545.         return;

  546.     } else {

  547.         av_freep(&buf);

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

  549.         avio_skip(pb, length);

  550.         return;

  551.     }

  552. 

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

  554.     av_freep(&buf);

  555. }

  556. 

  557. /**

  558.  * Parse metadata entries

  559.  */

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

  561. {

  562.     ff_asf_guid guid;

  563.     int length, type;

  564.     while(!pb->eof_reached) {

  565.         char key[1024];

  566.         ff_get_guid(pb, &guid);

  567.         type   = avio_rl32(pb);

  568.         length = avio_rl32(pb);

  569.         if (!length)

  570.             break;

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

  572.             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "

  573.                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));

  574.             break;

  575.         }

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

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

  578.     }

  579. 

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

  581. }

  582. 

  583. /**

  584.  * parse VIDEOINFOHEADER2 structure

  585.  * @return bytes consumed

  586.  */

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

  588. {

  589.     WtvContext *wtv = s->priv_data;

  590.     AVIOContext *pb = wtv->pb;

  591. 

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

  593.     ff_get_bmp_header(pb, st);

  594. 

  595.     return 72 + 40;

  596. }

  597. 

  598. /**

  599.  * Parse MPEG1WAVEFORMATEX extradata structure

  600.  */

  601. static void parse_mpeg1waveformatex(AVStream *st)

  602. {

  603.     /* fwHeadLayer */

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

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

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

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

  608.     }

  609. 

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

  611. 

  612.     /* dwHeadMode */

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

  614.     case 1 :

  615.     case 2 :

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

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

  618.              break;

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

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

  621.              break;

  622.     }

  623. }

  624. 

  625. /**

  626.  * Initialise stream

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

  628.  * @return NULL on error

  629.  */

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

  631. {

  632.     if (st) {

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

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

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

  636.         }

  637.     } else {

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

  639.         if (!wst)

  640.             return NULL;

  641.         st = avformat_new_stream(s, NULL);

  642.         if (!st) {

  643.             av_free(wst);

  644.             return NULL;

  645.         }

  646.         st->id = sid;

  647.         st->priv_data = wst;

  648.     }

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

  650.     st->need_parsing      = AVSTREAM_PARSE_FULL;

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

  652.     return st;

  653. }

  654. 

  655. /**

  656.  * parse Media Type structure and populate stream

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

  658.  * @param mediatype  Mediatype GUID

  659.  * @param subtype    Subtype GUID

  660.  * @param formattype Format GUID

  661.  * @param size       Size of format buffer

  662.  * @return NULL on error

  663.  */

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

  665.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  666.                                    ff_asf_guid formattype, int size)

  667. {

  668.     WtvContext *wtv = s->priv_data;

  669.     AVIOContext *pb = wtv->pb;

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

  671.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  672.         ff_asf_guid actual_subtype;

  673.         ff_asf_guid actual_formattype;

  674. 

  675.         if (size < 32) {

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

  677.             avio_skip(pb, size);

  678.             return NULL;

  679.         }

  680. 

  681.         avio_skip(pb, size - 32);

  682.         ff_get_guid(pb, &actual_subtype);

  683.         ff_get_guid(pb, &actual_formattype);

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

  685. 

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

  687.         avio_skip(pb, 32);

  688.         return st;

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

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

  691.         if (!st)

  692.             return NULL;

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

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

  695.             if (ret < 0)

  696.                 return NULL;

  697.         } else {

  698.             if (ff_guidcmp(formattype, format_none))

  699.                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

  700.             avio_skip(pb, size);

  701.         }

  702. 

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

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

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

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

  707.                 parse_mpeg1waveformatex(st);

  708.             else

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

  710.         } else {

  711.             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);

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

  713.                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));

  714.         }

  715.         return st;

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

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

  718.         if (!st)

  719.             return NULL;

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

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

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

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

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

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

  726.         } else {

  727.             if (ff_guidcmp(formattype, format_none))

  728.                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

  729.             avio_skip(pb, size);

  730.         }

  731. 

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

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

  734.         } else {

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

  736.         }

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

  738.             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));

  739.         return st;

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

  741.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

  743.         if (!st)

  744.             return NULL;

  745.         if (ff_guidcmp(formattype, format_none))

  746.             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

  747.         avio_skip(pb, size);

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

  749.         return st;

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

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

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

  753.         if (!st)

  754.             return NULL;

  755.         if (ff_guidcmp(formattype, format_none))

  756.             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

  757.         avio_skip(pb, size);

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

  759.         return st;

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

  761.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  762.         if (ff_guidcmp(formattype, format_none))

  763.             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

  764.         avio_skip(pb, size);

  765.         return NULL;

  766.     }

  767. 

  768.     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID

  769.                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",

  770.                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));

  771.     avio_skip(pb, size);

  772.     return NULL;

  773. }

  774. 

  775. enum {

  776.     SEEK_TO_DATA = 0,

  777.     SEEK_TO_PTS,

  778. };

  779. 

  780. /**

  781.  * Parse WTV chunks

  782.  * @param mode SEEK_TO_DATA or SEEK_TO_PTS

  783.  * @param seekts timestamp

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

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

  786.  */

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

  788. {

  789.     WtvContext *wtv = s->priv_data;

  790.     AVIOContext *pb = wtv->pb;

  791.     while (!pb->eof_reached) {

  792.         ff_asf_guid g;

  793.         int len, sid, consumed;

  794. 

  795.         ff_get_guid(pb, &g);

  796.         len = avio_rl32(pb);

  797.         if (len < 32)

  798.             break;

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

  800.         avio_skip(pb, 8);

  801.         consumed = 32;

  802. 

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

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

  805.                 ff_asf_guid mediatype, subtype, formattype;

  806.                 int size;

  807.                 avio_skip(pb, 28);

  808.                 ff_get_guid(pb, &mediatype);

  809.                 ff_get_guid(pb, &subtype);

  810.                 avio_skip(pb, 12);

  811.                 ff_get_guid(pb, &formattype);

  812.                 size = avio_rl32(pb);

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

  814.                 consumed += 92 + size;

  815.             }

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

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

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

  819.                 ff_asf_guid mediatype, subtype, formattype;

  820.                 int size;

  821.                 avio_skip(pb, 12);

  822.                 ff_get_guid(pb, &mediatype);

  823.                 ff_get_guid(pb, &subtype);

  824.                 avio_skip(pb, 12);

  825.                 ff_get_guid(pb, &formattype);

  826.                 size = avio_rl32(pb);

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

  828.                 consumed += 76 + size;

  829.             }

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

  831.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  832.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  833.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  834.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  835.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

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

  837.             if (stream_index >= 0) {

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

  839.                 uint8_t buf[258];

  840.                 const uint8_t *pbuf = buf;

  841.                 int buf_size;

  842. 

  843.                 avio_skip(pb, 8);

  844.                 consumed += 8;

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

  846.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  847.                     avio_skip(pb, 6);

  848.                     consumed += 6;

  849.                 }

  850. 

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

  852.                 avio_read(pb, buf, buf_size);

  853.                 consumed += buf_size;

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

  855.             }

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

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

  858.             if (stream_index >= 0) {

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

  860.                 int audio_type;

  861.                 avio_skip(pb, 8);

  862.                 audio_type = avio_r8(pb);

  863.                 if (audio_type == 2)

  864.                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

  865.                 else if (audio_type == 3)

  866.                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  867.                 consumed += 9;

  868.             }

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

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

  871.             if (stream_index >= 0) {

  872.                 avio_skip(pb, 12);

  873.                 if (avio_rl32(pb))

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

  875.                 consumed += 16;

  876.             }

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

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

  879.             if (stream_index >= 0) {

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

  881.                 uint8_t language[4];

  882.                 avio_skip(pb, 12);

  883.                 avio_read(pb, language, 3);

  884.                 if (language[0]) {

  885.                     language[3] = 0;

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

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

  888.                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  889.                 }

  890.                 consumed += 15;

  891.             }

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

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

  894.             if (stream_index >= 0) {

  895.                 avio_skip(pb, 8);

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

  897.                 consumed += 16;

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

  899.                     wtv->pts = AV_NOPTS_VALUE;

  900.                 else {

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

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

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

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

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

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

  907.                     return 0;

  908.                 }

  909.                 }

  910.             }

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

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

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

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

  915.                 wst->seen_data = 1;

  916.                 if (len_ptr) {

  917.                     *len_ptr = len;

  918.                 }

  919.                 return stream_index;

  920.             }

  921.         } else if (

  922.             !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}) ||

  923.             !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}) ||

  924.             !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}) ||

  925.             !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}) ||

  926.             !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}) ||

  927.             !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}) ||

  928.             !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}) ||

  929.             !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}) ||

  930.             !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}) ||

  931.             !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}) ||

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

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

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

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

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

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

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

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

  940.             //ignore known guids

  941.         } else

  942.             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));

  943. 

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

  945.     }

  946.     return AVERROR_EOF;

  947. }

  948. 

  949. /* declare utf16le strings */

  950. #define _ , 0,

  951. static const uint8_t timeline_le16[] =

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

  953. static const uint8_t table_0_entries_legacy_attrib_le16[] =

  954.     {'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};

  955. static const uint8_t table_0_entries_time_le16[] =

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

  957. static const uint8_t timeline_table_0_entries_Events_le16[] =

  958.     {'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};

  959. #undef _

  960. 

  961. static int read_header(AVFormatContext *s)

  962. {

  963.     WtvContext *wtv = s->priv_data;

  964.     int root_sector, root_size;

  965.     uint8_t root[WTV_SECTOR_SIZE];

  966.     AVIOContext *pb;

  967.     int64_t timeline_pos;

  968.     int ret;

  969. 

  970.     wtv->epoch          =

  971.     wtv->pts            =

  972.     wtv->last_valid_pts = AV_NOPTS_VALUE;

  973. 

  974.     /* read root directory sector */

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

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

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

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

  979.         return AVERROR_INVALIDDATA;

  980.     }

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

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

  983. 

  984.     ret = seek_by_sector(s->pb, root_sector, 0);

  985.     if (ret < 0)

  986.         return ret;

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

  988.     if (root_size < 0)

  989.         return AVERROR_INVALIDDATA;

  990. 

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

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

  993.     if (!wtv->pb) {

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

  995.         return AVERROR_INVALIDDATA;

  996.     }

  997. 

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

  999.     if (ret < 0)

  1000.         return ret;

  1001.     avio_seek(wtv->pb, -32, SEEK_CUR);

  1002. 

  1003.     timeline_pos = avio_tell(s->pb); // save before opening another file

  1004. 

  1005.     /* read metadata */

  1006.     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);

  1007.     if (pb) {

  1008.         parse_legacy_attrib(s, pb);

  1009.         wtvfile_close(pb);

  1010.     }

  1011. 

  1012.     /* read seek index */

  1013.     if (s->nb_streams) {

  1014.         AVStream *st = s->streams[0];

  1015.         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);

  1016.         if (pb) {

  1017.             while(1) {

  1018.                 uint64_t timestamp = avio_rl64(pb);

  1019.                 uint64_t frame_nb  = avio_rl64(pb);

  1020.                 if (pb->eof_reached)

  1021.                     break;

  1022.                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,

  1023.                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

  1024.             }

  1025.             wtvfile_close(pb);

  1026. 

  1027.             if (wtv->nb_index_entries) {

  1028.                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);

  1029.                 if (pb) {

  1030.                     int i;

  1031.                     while (1) {

  1032.                         uint64_t frame_nb = avio_rl64(pb);

  1033.                         uint64_t position = avio_rl64(pb);

  1034.                         if (pb->eof_reached)

  1035.                             break;

  1036.                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {

  1037.                             AVIndexEntry *e = wtv->index_entries + i;

  1038.                             if (frame_nb > e->size)

  1039.                                 break;

  1040.                             if (position > e->pos)

  1041.                                 e->pos = position;

  1042.                         }

  1043.                     }

  1044.                     wtvfile_close(pb);

  1045.                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;

  1046.                 }

  1047.             }

  1048.         }

  1049.     }

  1050. 

  1051.     avio_seek(s->pb, timeline_pos, SEEK_SET);

  1052.     return 0;

  1053. }

  1054. 

  1055. static int read_packet(AVFormatContext *s, AVPacket *pkt)

  1056. {

  1057.     WtvContext *wtv = s->priv_data;

  1058.     AVIOContext *pb = wtv->pb;

  1059.     int stream_index, len, ret;

  1060. 

  1061.     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);

  1062.     if (stream_index < 0)

  1063.         return stream_index;

  1064. 

  1065.     ret = av_get_packet(pb, pkt, len - 32);

  1066.     if (ret < 0)

  1067.         return ret;

  1068.     pkt->stream_index = stream_index;

  1069.     pkt->pts          = wtv->pts;

  1070.     avio_skip(pb, WTV_PAD8(len) - len);

  1071.     return 0;

  1072. }

  1073. 

  1074. static int read_seek(AVFormatContext *s, int stream_index,

  1075.                      int64_t ts, int flags)

  1076. {

  1077.     WtvContext *wtv = s->priv_data;

  1078.     AVIOContext *pb = wtv->pb;

  1079.     AVStream *st = s->streams[0];

  1080.     int64_t ts_relative;

  1081.     int i;

  1082. 

  1083.     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

  1084.         return AVERROR(ENOSYS);

  1085. 

  1086.     /* timestamp adjustment is required because wtv->pts values are absolute,

  1087.      * whereas AVIndexEntry->timestamp values are relative to epoch. */

  1088.     ts_relative = ts;

  1089.     if (wtv->epoch != AV_NOPTS_VALUE)

  1090.         ts_relative -= wtv->epoch;

  1091. 

  1092.     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

  1093.     if (i < 0) {

  1094.         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

  1095.             avio_seek(pb, 0, SEEK_SET);

  1096.         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

  1097.             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

  1098.         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)

  1099.             return AVERROR(ERANGE);

  1100.         return 0;

  1101.     }

  1102.     wtv->pts = wtv->index_entries[i].timestamp;

  1103.     if (wtv->epoch != AV_NOPTS_VALUE)

  1104.         wtv->pts += wtv->epoch;

  1105.     wtv->last_valid_pts = wtv->pts;

  1106.     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);

  1107.     return 0;

  1108. }

  1109. 

  1110. static int read_close(AVFormatContext *s)

  1111. {

  1112.     WtvContext *wtv = s->priv_data;

  1113.     av_free(wtv->index_entries);

  1114.     wtvfile_close(wtv->pb);

  1115.     return 0;

  1116. }

  1117. 

  1118. AVInputFormat ff_wtv_demuxer = {

  1119.     .name           = "wtv",

  1120.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),

  1121.     .priv_data_size = sizeof(WtvContext),

  1122.     .read_probe     = read_probe,

  1123.     .read_header    = read_header,

  1124.     .read_packet    = read_packet,

  1125.     .read_seek      = read_seek,

  1126.     .read_close     = read_close,

  1127.     .flags          = AVFMT_SHOW_IDS,

  1128. };