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FFmpeg/libavformat/wtv.c

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  1. /*

  2.  * Windows Television (WTV) demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * Windows Television (WTV) demuxer

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

  26.  */

  27. 

  28. #include "libavutil/intreadwrite.h"

  29. #include "libavutil/intfloat_readwrite.h"

  30. #include "avformat.h"

  31. #include "internal.h"

  32. #include "riff.h"

  33. #include "asf.h"

  34. #include "mpegts.h"

  35. #include <strings.h>

  36. 

  37. /* Macros for formating GUIDs */

  38. #define PRI_PRETTY_GUID \

  39.     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"

  40. #define ARG_PRETTY_GUID(g) \

  41.     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]

  42. #define LEN_PRETTY_GUID 34

  43. 

  44. /*

  45.  *

  46.  * File system routines

  47.  *

  48.  */

  49. 

  50. #define WTV_SECTOR_BITS    12

  51. #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)

  52. #define WTV_BIGSECTOR_BITS 18

  53. 

  54. typedef struct {

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

  56. 

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

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

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

  60. 

  61.     int error;

  62.     int64_t position;

  63.     int64_t length;

  64. } WtvFile;

  65. 

  66. /**

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

  68.  */

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

  70. {

  71.     WtvFile *wf = opaque;

  72.     AVIOContext *pb = wf->pb_filesystem;

  73.     int nread = 0;

  74. 

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

  76.         return -1;

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

  78.         return 0;

  79. 

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

  81.     while(nread < buf_size) {

  82.         int n;

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

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

  85. 

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

  87.         if (n <= 0)

  88.             break;

  89.         nread += n;

  90.         buf += n;

  91.         wf->position += n;

  92.         if (n == remaining_in_sector) {

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

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

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

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

  97.                 wf->error = 1;

  98.                 break;

  99.             }

  100.         }

  101.     }

  102.     return nread;

  103. }

  104. 

  105. /**

  106.  * @return position (or file length)

  107.  */

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

  109. {

  110.     WtvFile *wf = opaque;

  111.     AVIOContext *pb = wf->pb_filesystem;

  112. 

  113.     if (whence == AVSEEK_SIZE)

  114.         return wf->length;

  115.     else if (whence == SEEK_CUR)

  116.         offset = wf->position + offset;

  117.     else if (whence == SEEK_END)

  118.         offset = wf->length;

  119. 

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

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

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

  123.     wf->position = offset;

  124.     return offset;

  125. }

  126. 

  127. /**

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

  129.  * @param pb

  130.  * @param[out] data destination

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

  132.  * @return    total number of integers read

  133.  */

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

  135. {

  136.     int i, total = 0;

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

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

  139.            total++;

  140.     }

  141.     return total;

  142. }

  143. 

  144. /**

  145.  * Open file

  146.  * @param first_sector  First sector

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

  148.  * @param depth         File allocation table depth

  149.  * @return NULL on error

  150.  */

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

  152. {

  153.     AVIOContext *pb;

  154.     WtvFile *wf;

  155.     uint8_t *buffer;

  156. 

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

  158.         return NULL;

  159. 

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

  161.     if (!wf)

  162.         return NULL;

  163. 

  164.     if (depth == 0) {

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

  166.         if (!wf->sectors) {

  167.             av_free(wf);

  168.             return NULL;

  169.         }

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

  171.         wf->nb_sectors  = 1;

  172.         wf->sector_bits = WTV_SECTOR_BITS;

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

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

  175.         if (!wf->sectors) {

  176.             av_free(wf);

  177.             return NULL;

  178.         }

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

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

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

  182.         uint32_t sectors1[WTV_SECTOR_SIZE / 4];

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

  184.         int i;

  185. 

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

  187.         if (!wf->sectors) {

  188.             av_free(wf);

  189.             return NULL;

  190.         }

  191.         wf->nb_sectors = 0;

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

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

  194.                 break;

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

  196.         }

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

  198.     } else {

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

  200.         av_free(wf);

  201.         return NULL;

  202.     }

  203. 

  204.     if (!wf->nb_sectors) {

  205.         av_free(wf->sectors);

  206.         av_free(wf);

  207.         return NULL;

  208.     }

  209. 

  210.     /* check length */

  211.     length &= 0xFFFFFFFFFFFF;

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

  213.         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);

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

  215.     }

  216.     wf->length = length;

  217. 

  218.     /* seek to intial sector */

  219.     wf->position = 0;

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

  221.         av_free(wf->sectors);

  222.         av_free(wf);

  223.         return NULL;

  224.     }

  225. 

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

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

  228.     if (!buffer) {

  229.         av_free(wf->sectors);

  230.         av_free(wf);

  231.         return NULL;

  232.     }

  233. 

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

  235.                            wtvfile_read_packet, NULL, wtvfile_seek);

  236.     if (!pb) {

  237.         av_free(buffer);

  238.         av_free(wf->sectors);

  239.         av_free(wf);

  240.     }

  241.     return pb;

  242. }

  243. 

  244. static const ff_asf_guid dir_entry_guid =

  245.     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};

  246. 

  247. /**

  248.  * Open file using filename

  249.  * @param[in]  buf       directory buffer

  250.  * @param      buf_size  directory buffer size

  251.  * @param[in]  filename

  252.  * @param      filename_size size of filename

  253.  * @return NULL on error

  254.  */

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

  256. {

  257.     const uint8_t *buf_end = buf + buf_size;

  258. 

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

  260.         int dir_length, name_size, first_sector, depth;

  261.         uint64_t file_length;

  262.         const uint8_t *name;

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

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

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

  266.             break;

  267.         }

  268.         dir_length  = AV_RL16(buf + 16);

  269.         file_length = AV_RL64(buf + 24);

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

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

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

  273.             break;

  274.         }

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

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

  277. 

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

  279.         name = buf + 40;

  280.         if (name_size >= filename_size &&

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

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

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

  284. 

  285.         buf += dir_length;

  286.     }

  287.     return 0;

  288. }

  289. 

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

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

  292. 

  293. /**

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

  295.  */

  296. static void wtvfile_close(AVIOContext *pb)

  297. {

  298.     WtvFile *wf = pb->opaque;

  299.     av_free(wf->sectors);

  300.     av_free(pb);

  301. }

  302. 

  303. /*

  304.  *

  305.  * Main demuxer

  306.  *

  307.  */

  308. 

  309. typedef struct {

  310.     int seen_data;

  311. } WtvStream;

  312. 

  313. typedef struct {

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

  315.     int64_t epoch;

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

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

  318. 

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

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

  321.     AVIndexEntry *index_entries;

  322.     int nb_index_entries;

  323.     unsigned int index_entries_allocated_size;

  324. } WtvContext;

  325. 

  326. /* WTV GUIDs */

  327. static const ff_asf_guid wtv_guid =

  328.     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  329. static const ff_asf_guid metadata_guid =

  330.     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};

  331. static const ff_asf_guid timestamp_guid =

  332.     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};

  333. static const ff_asf_guid data_guid =

  334.     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  335. static const ff_asf_guid stream_guid =

  336.     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};

  337. static const ff_asf_guid stream2_guid =

  338.     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  339. static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

  340.     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};

  341. static const ff_asf_guid EVENTID_LanguageSpanningEvent =

  342.     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};

  343. static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

  344.     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};

  345. static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

  346.     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};

  347. static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

  348.     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};

  349. static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =

  350.     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};

  351. static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

  352.     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};

  353. static const ff_asf_guid EVENTID_TeletextSpanningEvent =

  354.     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};

  355. static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =

  356.     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};

  357. 

  358. /* Windows media GUIDs */

  359. 

  360. /* Media types */

  361. static const ff_asf_guid mediatype_audio =

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

  363. static const ff_asf_guid mediatype_video =

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

  365. static const ff_asf_guid mediasubtype_mpeg1payload =

  366.     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};

  367. static const ff_asf_guid mediatype_mpeg2_sections =

  368.     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};

  369. static const ff_asf_guid mediatype_mpeg2_pes =

  370.     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  371. static const ff_asf_guid mediatype_mstvcaption =

  372.     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};

  373. 

  374. /* Media subtypes */

  375. static const ff_asf_guid mediasubtype_cpfilters_processed =

  376.     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};

  377. static const ff_asf_guid mediasubtype_dvb_subtitle =

  378.     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};

  379. static const ff_asf_guid mediasubtype_teletext =

  380.     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  381. static const ff_asf_guid mediasubtype_dtvccdata =

  382.     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};

  383. static const ff_asf_guid mediasubtype_mpeg2_sections =

  384.     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};

  385. 

  386. /* Formats */

  387. static const ff_asf_guid format_cpfilters_processed =

  388.     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};

  389. static const ff_asf_guid format_waveformatex =

  390.     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};

  391. static const ff_asf_guid format_videoinfo2 =

  392.     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  393. static const ff_asf_guid format_mpeg2_video =

  394.     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  395. static const ff_asf_guid format_none =

  396.     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};

  397. 

  398. static const AVCodecGuid video_guids[] = {

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

  400.     {CODEC_ID_NONE}

  401. };

  402. 

  403. static int read_probe(AVProbeData *p)

  404. {

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

  406. }

  407. 

  408. /**

  409.  * Convert win32 FILETIME to ISO-8601 string

  410.  */

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

  412. {

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

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

  415. }

  416. 

  417. /**

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

  419.  */

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

  421. {

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

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

  424. }

  425. 

  426. /**

  427.  * Convert OLE DATE to ISO-8601 string

  428.  */

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

  430. {

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

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

  433. }

  434. 

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

  436. {

  437.     char mime[1024];

  438.     char description[1024];

  439.     unsigned int filesize;

  440.     AVStream *st;

  441.     int64_t pos = avio_tell(pb);

  442. 

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

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

  445.         goto done;

  446. 

  447.     avio_r8(pb);

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

  449.     filesize = avio_rl32(pb);

  450.     if (!filesize)

  451.         goto done;

  452. 

  453.     st = av_new_stream(s, 0);

  454.     if (!st)

  455.         goto done;

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

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

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

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

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

  461.         goto done;

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

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

  464. done:

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

  466. }

  467. 

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

  469. {

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

  471.     char *buf = av_malloc(buf_size);

  472.     if (!buf)

  473.         return;

  474. 

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

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

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

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

  479.         if (!strlen(buf)) {

  480.            av_free(buf);

  481.            return;

  482.         }

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

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

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

  486.         int64_t num = avio_rl64(pb);

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

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

  489.             filetime_to_iso8601(buf, buf_size, num);

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

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

  492.             crazytime_to_iso8601(buf, buf_size, num);

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

  494.             oledate_to_iso8601(buf, buf_size, num);

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

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

  497.         else

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

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

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

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

  502.         ff_asf_guid guid;

  503.         avio_read(pb, guid, 16);

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

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

  506.         get_attachment(s, pb, length);

  507.         av_freep(&buf);

  508.         return;

  509.     } else {

  510.         av_freep(&buf);

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

  512.         avio_skip(pb, length);

  513.         return;

  514.     }

  515. 

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

  517.     av_freep(&buf);

  518. }

  519. 

  520. /**

  521.  * Parse metadata entries

  522.  */

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

  524. {

  525.     ff_asf_guid guid;

  526.     int length, type;

  527.     while(!url_feof(pb)) {

  528.         char key[1024];

  529.         ff_get_guid(pb, &guid);

  530.         type   = avio_rl32(pb);

  531.         length = avio_rl32(pb);

  532.         if (!length)

  533.             break;

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

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

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

  537.             break;

  538.         }

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

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

  541.     }

  542. 

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

  544. }

  545. 

  546. /**

  547.  * parse VIDEOINFOHEADER2 structure

  548.  * @return bytes consumed

  549.  */

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

  551. {

  552.     WtvContext *wtv = s->priv_data;

  553.     AVIOContext *pb = wtv->pb;

  554. 

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

  556.     ff_get_bmp_header(pb, st);

  557. 

  558.     return 72 + 40;

  559. }

  560. 

  561. /**

  562.  * Parse MPEG1WAVEFORMATEX extradata structure

  563.  */

  564. static void parse_mpeg1waveformatex(AVStream *st)

  565. {

  566.     /* fwHeadLayer */

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

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

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

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

  571.     }

  572. 

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

  574. 

  575.     /* dwHeadMode */

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

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

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

  579.     }

  580. }

  581. 

  582. /**

  583.  * Initialise stream

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

  585.  * @return NULL on error

  586.  */

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

  588. {

  589.     if (st) {

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

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

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

  593.         }

  594.     } else {

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

  596.         if (!wst)

  597.             return NULL;

  598.         st = av_new_stream(s, sid);

  599.         if (!st)

  600.             return NULL;

  601.         st->priv_data = wst;

  602.     }

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

  604.     st->need_parsing      = AVSTREAM_PARSE_FULL;

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

  606.     return st;

  607. }

  608. 

  609. /**

  610.  * parse Media Type structure and populate stream

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

  612.  * @param mediatype  Mediatype GUID

  613.  * @param subtype    Subtype GUID

  614.  * @param formattype Format GUID

  615.  * @param size       Size of format buffer

  616.  * @return NULL on error

  617.  */

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

  619.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  620.                                    ff_asf_guid formattype, int size)

  621. {

  622.     WtvContext *wtv = s->priv_data;

  623.     AVIOContext *pb = wtv->pb;

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

  625.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  626.         ff_asf_guid actual_subtype;

  627.         ff_asf_guid actual_formattype;

  628. 

  629.         if (size < 32) {

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

  631.             avio_skip(pb, size);

  632.             return NULL;

  633.         }

  634. 

  635.         avio_skip(pb, size - 32);

  636.         ff_get_guid(pb, &actual_subtype);

  637.         ff_get_guid(pb, &actual_formattype);

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

  639. 

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

  641.         avio_skip(pb, 32);

  642.         return st;

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

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

  645.         if (!st)

  646.             return NULL;

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

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

  649.             if (ret < 0)

  650.                 return NULL;

  651.         } else {

  652.             if (ff_guidcmp(formattype, format_none))

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

  654.             avio_skip(pb, size);

  655.         }

  656. 

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

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

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

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

  661.                 parse_mpeg1waveformatex(st);

  662.             else

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

  664.         } else {

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

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

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

  668.         }

  669.         return st;

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

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

  672.         if (!st)

  673.             return NULL;

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

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

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

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

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

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

  680.         } else {

  681.             if (ff_guidcmp(formattype, format_none))

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

  683.             avio_skip(pb, size);

  684.         }

  685. 

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

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

  688.         } else {

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

  690.         }

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

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

  693.         return st;

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

  695.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

  697.         if (!st)

  698.             return NULL;

  699.         if (ff_guidcmp(formattype, format_none))

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

  701.         avio_skip(pb, size);

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

  703.         return st;

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

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

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

  707.         if (!st)

  708.             return NULL;

  709.         if (ff_guidcmp(formattype, format_none))

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

  711.         avio_skip(pb, size);

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

  713.         return st;

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

  715.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  716.         if (ff_guidcmp(formattype, format_none))

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

  718.         avio_skip(pb, size);

  719.         return NULL;

  720.     }

  721. 

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

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

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

  725.     avio_skip(pb, size);

  726.     return NULL;

  727. }

  728. 

  729. enum {

  730.     SEEK_TO_DATA = 0,

  731.     SEEK_TO_PTS,

  732. };

  733. 

  734. /**

  735.  * Parse WTV chunks

  736.  * @param mode SEEK_TO_DATA or SEEK_TO_PTS

  737.  * @param seekts timestamp

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

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

  740.  */

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

  742. {

  743.     WtvContext *wtv = s->priv_data;

  744.     AVIOContext *pb = wtv->pb;

  745.     while (!url_feof(pb)) {

  746.         ff_asf_guid g;

  747.         int len, sid, consumed;

  748. 

  749.         ff_get_guid(pb, &g);

  750.         len = avio_rl32(pb);

  751.         if (len < 32)

  752.             break;

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

  754.         avio_skip(pb, 8);

  755.         consumed = 32;

  756. 

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

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

  759.                 ff_asf_guid mediatype, subtype, formattype;

  760.                 int size;

  761.                 avio_skip(pb, 28);

  762.                 ff_get_guid(pb, &mediatype);

  763.                 ff_get_guid(pb, &subtype);

  764.                 avio_skip(pb, 12);

  765.                 ff_get_guid(pb, &formattype);

  766.                 size = avio_rl32(pb);

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

  768.                 consumed += 92 + size;

  769.             }

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

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

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

  773.                 ff_asf_guid mediatype, subtype, formattype;

  774.                 int size;

  775.                 avio_skip(pb, 12);

  776.                 ff_get_guid(pb, &mediatype);

  777.                 ff_get_guid(pb, &subtype);

  778.                 avio_skip(pb, 12);

  779.                 ff_get_guid(pb, &formattype);

  780.                 size = avio_rl32(pb);

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

  782.                 consumed += 76 + size;

  783.             }

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

  785.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  786.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  787.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  788.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  789.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

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

  791.             if (stream_index >= 0) {

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

  793.                 uint8_t buf[258];

  794.                 const uint8_t *pbuf = buf;

  795.                 int buf_size;

  796. 

  797.                 avio_skip(pb, 8);

  798.                 consumed += 8;

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

  800.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  801.                     avio_skip(pb, 6);

  802.                     consumed += 6;

  803.                 }

  804. 

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

  806.                 avio_read(pb, buf, buf_size);

  807.                 consumed += buf_size;

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

  809.             }

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

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

  812.             if (stream_index >= 0) {

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

  814.                 int audio_type;

  815.                 avio_skip(pb, 8);

  816.                 audio_type = avio_r8(pb);

  817.                 if (audio_type == 2)

  818.                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

  819.                 else if (audio_type == 3)

  820.                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  821.                 consumed += 9;

  822.             }

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

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

  825.             if (stream_index >= 0) {

  826.                 avio_skip(pb, 12);

  827.                 if (avio_rl32(pb))

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

  829.                 consumed += 16;

  830.             }

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

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

  833.             if (stream_index >= 0) {

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

  835.                 uint8_t language[4];

  836.                 avio_skip(pb, 12);

  837.                 avio_read(pb, language, 3);

  838.                 if (language[0]) {

  839.                     language[3] = 0;

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

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

  842.                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  843.                 }

  844.                 consumed += 15;

  845.             }

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

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

  848.             if (stream_index >= 0) {

  849.                 avio_skip(pb, 8);

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

  851.                 consumed += 16;

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

  853.                     wtv->pts = AV_NOPTS_VALUE;

  854.                 else {

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

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

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

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

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

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

  861.                     return 0;

  862.                 }

  863.                 }

  864.             }

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

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

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

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

  869.                 wst->seen_data = 1;

  870.                 if (len_ptr) {

  871.                     *len_ptr = len;

  872.                 }

  873.                 return stream_index;

  874.             }

  875.         } else if (

  876.             !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}) ||

  877.             !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}) ||

  878.             !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}) ||

  879.             !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}) ||

  880.             !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}) ||

  881.             !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}) ||

  882.             !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}) ||

  883.             !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}) ||

  884.             !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}) ||

  885.             !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}) ||

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

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

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

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

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

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

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

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

  894.             //ignore known guids

  895.         } else

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

  897. 

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

  899.     }

  900.     return AVERROR_EOF;

  901. }

  902. 

  903. /* declare utf16le strings */

  904. #define _ , 0,

  905. static const uint8_t timeline_le16[] =

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

  907. static const uint8_t table_0_entries_legacy_attrib_le16[] =

  908.     {'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};

  909. static const uint8_t table_0_entries_time_le16[] =

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

  911. static const uint8_t timeline_table_0_entries_Events_le16[] =

  912.     {'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};

  913. #undef _

  914. 

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

  916. {

  917.     WtvContext *wtv = s->priv_data;

  918.     int root_sector, root_size;

  919.     uint8_t root[WTV_SECTOR_SIZE];

  920.     AVIOContext *pb;

  921.     int64_t timeline_pos;

  922.     int ret;

  923. 

  924.     wtv->epoch          =

  925.     wtv->pts            =

  926.     wtv->last_valid_pts = AV_NOPTS_VALUE;

  927. 

  928.     /* read root directory sector */

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

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

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

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

  933.         return AVERROR_INVALIDDATA;

  934.     }

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

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

  937. 

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

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

  940.     if (root_size < 0)

  941.         return AVERROR_INVALIDDATA;

  942. 

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

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

  945.     if (!wtv->pb) {

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

  947.         return AVERROR_INVALIDDATA;

  948.     }

  949. 

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

  951.     if (ret < 0)

  952.         return ret;

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

  954. 

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

  956. 

  957.     /* read metadata */

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

  959.     if (pb) {

  960.         parse_legacy_attrib(s, pb);

  961.         wtvfile_close(pb);

  962.     }

  963. 

  964.     /* read seek index */

  965.     if (s->nb_streams) {

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

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

  968.         if (pb) {

  969.             while(1) {

  970.                 uint64_t timestamp = avio_rl64(pb);

  971.                 uint64_t frame_nb  = avio_rl64(pb);

  972.                 if (url_feof(pb))

  973.                     break;

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

  975.                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

  976.             }

  977.             wtvfile_close(pb);

  978. 

  979.             if (wtv->nb_index_entries) {

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

  981.                 if (pb) {

  982.                     int i;

  983.                     while (1) {

  984.                         uint64_t frame_nb = avio_rl64(pb);

  985.                         uint64_t position = avio_rl64(pb);

  986.                         if (url_feof(pb))

  987.                             break;

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

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

  990.                             if (frame_nb > e->size)

  991.                                 break;

  992.                             if (position > e->pos)

  993.                                 e->pos = position;

  994.                         }

  995.                     }

  996.                     wtvfile_close(pb);

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

  998.                 }

  999.             }

  1000.         }

  1001.     }

  1002. 

  1003.     avio_seek(s->pb, timeline_pos, SEEK_SET);

  1004.     return 0;

  1005. }

  1006. 

  1007. static int read_packet(AVFormatContext *s, AVPacket *pkt)

  1008. {

  1009.     WtvContext *wtv = s->priv_data;

  1010.     AVIOContext *pb = wtv->pb;

  1011.     int stream_index, len, ret;

  1012. 

  1013.     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);

  1014.     if (stream_index < 0)

  1015.         return stream_index;

  1016. 

  1017.     ret = av_get_packet(pb, pkt, len - 32);

  1018.     if (ret < 0)

  1019.         return ret;

  1020.     pkt->stream_index = stream_index;

  1021.     pkt->pts          = wtv->pts;

  1022.     avio_skip(pb, WTV_PAD8(len) - len);

  1023.     return 0;

  1024. }

  1025. 

  1026. static int read_seek(AVFormatContext *s, int stream_index,

  1027.                      int64_t ts, int flags)

  1028. {

  1029.     WtvContext *wtv = s->priv_data;

  1030.     AVIOContext *pb = wtv->pb;

  1031.     AVStream *st = s->streams[0];

  1032.     int64_t ts_relative;

  1033.     int i;

  1034. 

  1035.     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

  1036.         return AVERROR(ENOSYS);

  1037. 

  1038.     /* timestamp adjustment is required because wtv->pts values are absolute,

  1039.      * whereas AVIndexEntry->timestamp values are relative to epoch. */

  1040.     ts_relative = ts;

  1041.     if (wtv->epoch != AV_NOPTS_VALUE)

  1042.         ts_relative -= wtv->epoch;

  1043. 

  1044.     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

  1045.     if (i < 0) {

  1046.         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

  1047.             avio_seek(pb, 0, SEEK_SET);

  1048.         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

  1049.             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

  1050.         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)

  1051.             return AVERROR(ERANGE);

  1052.         return 0;

  1053.     }

  1054.     wtv->pts = wtv->index_entries[i].timestamp;

  1055.     if (wtv->epoch != AV_NOPTS_VALUE)

  1056.         wtv->pts += wtv->epoch;

  1057.     wtv->last_valid_pts = wtv->pts;

  1058.     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);

  1059.     return 0;

  1060. }

  1061. 

  1062. static int read_close(AVFormatContext *s)

  1063. {

  1064.     WtvContext *wtv = s->priv_data;

  1065.     wtvfile_close(wtv->pb);

  1066.     return 0;

  1067. }

  1068. 

  1069. AVInputFormat ff_wtv_demuxer = {

  1070.     .name           = "wtv",

  1071.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),

  1072.     .priv_data_size = sizeof(WtvContext),

  1073.     .read_probe     = read_probe,

  1074.     .read_header    = read_header,

  1075.     .read_packet    = read_packet,

  1076.     .read_seek      = read_seek,

  1077.     .read_close     = read_close,

  1078.     .flags          = AVFMT_SHOW_IDS,

  1079. };