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FFmpeg/libavformat/wtv.c

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  1. /*

  2.  * Windows Television (WTV) demuxer

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * Windows Television (WTV) demuxer

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

  26.  */

  27. 

  28. #include "libavutil/channel_layout.h"

  29. #include "libavutil/intreadwrite.h"

  30. #include "libavutil/intfloat.h"

  31. #include "libavutil/dict.h"

  32. #include "avformat.h"

  33. #include "internal.h"

  34. #include "riff.h"

  35. #include "asf.h"

  36. #include "mpegts.h"

  37. 

  38. /* Macros for formating GUIDs */

  39. #define PRI_PRETTY_GUID \

  40.     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"

  41. #define ARG_PRETTY_GUID(g) \

  42.     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]

  43. #define LEN_PRETTY_GUID 34

  44. 

  45. /*

  46.  *

  47.  * File system routines

  48.  *

  49.  */

  50. 

  51. #define WTV_SECTOR_BITS    12

  52. #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)

  53. #define WTV_BIGSECTOR_BITS 18

  54. 

  55. typedef struct {

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

  57. 

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

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

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

  61. 

  62.     int error;

  63.     int64_t position;

  64.     int64_t length;

  65. } WtvFile;

  66. 

  67. /**

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

  69.  */

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

  71. {

  72.     WtvFile *wf = opaque;

  73.     AVIOContext *pb = wf->pb_filesystem;

  74.     int nread = 0;

  75. 

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

  77.         return -1;

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

  79.         return 0;

  80. 

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

  82.     while(nread < buf_size) {

  83.         int n;

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

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

  86. 

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

  88.         if (n <= 0)

  89.             break;

  90.         nread += n;

  91.         buf += n;

  92.         wf->position += n;

  93.         if (n == remaining_in_sector) {

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

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

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

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

  98.                 wf->error = 1;

  99.                 break;

  100.             }

  101.         }

  102.     }

  103.     return nread;

  104. }

  105. 

  106. /**

  107.  * @return position (or file length)

  108.  */

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

  110. {

  111.     WtvFile *wf = opaque;

  112.     AVIOContext *pb = wf->pb_filesystem;

  113. 

  114.     if (whence == AVSEEK_SIZE)

  115.         return wf->length;

  116.     else if (whence == SEEK_CUR)

  117.         offset = wf->position + offset;

  118.     else if (whence == SEEK_END)

  119.         offset = wf->length;

  120. 

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

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

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

  124.     wf->position = offset;

  125.     return offset;

  126. }

  127. 

  128. /**

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

  130.  * @param pb

  131.  * @param[out] data destination

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

  133.  * @return    total number of integers read

  134.  */

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

  136. {

  137.     int i, total = 0;

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

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

  140.            total++;

  141.     }

  142.     return total;

  143. }

  144. 

  145. /**

  146.  * Open file

  147.  * @param first_sector  First sector

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

  149.  * @param depth         File allocation table depth

  150.  * @return NULL on error

  151.  */

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

  153. {

  154.     AVIOContext *pb;

  155.     WtvFile *wf;

  156.     uint8_t *buffer;

  157. 

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

  159.         return NULL;

  160. 

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

  162.     if (!wf)

  163.         return NULL;

  164. 

  165.     if (depth == 0) {

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

  167.         if (!wf->sectors) {

  168.             av_free(wf);

  169.             return NULL;

  170.         }

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

  172.         wf->nb_sectors  = 1;

  173.         wf->sector_bits = WTV_SECTOR_BITS;

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

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

  176.         if (!wf->sectors) {

  177.             av_free(wf);

  178.             return NULL;

  179.         }

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

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

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

  183.         uint32_t sectors1[WTV_SECTOR_SIZE / 4];

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

  185.         int i;

  186. 

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

  188.         if (!wf->sectors) {

  189.             av_free(wf);

  190.             return NULL;

  191.         }

  192.         wf->nb_sectors = 0;

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

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

  195.                 break;

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

  197.         }

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

  199.     } else {

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

  201.         av_free(wf);

  202.         return NULL;

  203.     }

  204. 

  205.     if (!wf->nb_sectors) {

  206.         av_free(wf->sectors);

  207.         av_free(wf);

  208.         return NULL;

  209.     }

  210. 

  211.     /* check length */

  212.     length &= 0xFFFFFFFFFFFF;

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

  214.         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);

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

  216.     }

  217.     wf->length = length;

  218. 

  219.     /* seek to initial sector */

  220.     wf->position = 0;

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

  222.         av_free(wf->sectors);

  223.         av_free(wf);

  224.         return NULL;

  225.     }

  226. 

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

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

  229.     if (!buffer) {

  230.         av_free(wf->sectors);

  231.         av_free(wf);

  232.         return NULL;

  233.     }

  234. 

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

  236.                            wtvfile_read_packet, NULL, wtvfile_seek);

  237.     if (!pb) {

  238.         av_free(buffer);

  239.         av_free(wf->sectors);

  240.         av_free(wf);

  241.     }

  242.     return pb;

  243. }

  244. 

  245. static const ff_asf_guid dir_entry_guid =

  246.     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};

  247. 

  248. /**

  249.  * Open file using filename

  250.  * @param[in]  buf       directory buffer

  251.  * @param      buf_size  directory buffer size

  252.  * @param[in]  filename

  253.  * @param      filename_size size of filename

  254.  * @return NULL on error

  255.  */

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

  257. {

  258.     const uint8_t *buf_end = buf + buf_size;

  259. 

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

  261.         int dir_length, name_size, first_sector, depth;

  262.         uint64_t file_length;

  263.         const uint8_t *name;

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

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

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

  267.             break;

  268.         }

  269.         dir_length  = AV_RL16(buf + 16);

  270.         file_length = AV_RL64(buf + 24);

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

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

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

  274.             break;

  275.         }

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

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

  278. 

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

  280.         name = buf + 40;

  281.         if (name_size >= filename_size &&

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

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

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

  285. 

  286.         buf += dir_length;

  287.     }

  288.     return 0;

  289. }

  290. 

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

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

  293. 

  294. /**

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

  296.  */

  297. static void wtvfile_close(AVIOContext *pb)

  298. {

  299.     WtvFile *wf = pb->opaque;

  300.     av_free(wf->sectors);

  301.     av_free(wf);

  302.     av_free(pb->buffer);

  303.     av_free(pb);

  304. }

  305. 

  306. /*

  307.  *

  308.  * Main demuxer

  309.  *

  310.  */

  311. 

  312. typedef struct {

  313.     int seen_data;

  314. } WtvStream;

  315. 

  316. typedef struct {

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

  318.     int64_t epoch;

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

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

  321. 

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

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

  324.     AVIndexEntry *index_entries;

  325.     int nb_index_entries;

  326.     unsigned int index_entries_allocated_size;

  327. } WtvContext;

  328. 

  329. /* WTV GUIDs */

  330. static const ff_asf_guid wtv_guid =

  331.     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  332. static const ff_asf_guid metadata_guid =

  333.     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};

  334. static const ff_asf_guid timestamp_guid =

  335.     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};

  336. static const ff_asf_guid data_guid =

  337.     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  338. static const ff_asf_guid stream_guid =

  339.     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};

  340. static const ff_asf_guid stream2_guid =

  341.     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  342. static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

  343.     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};

  344. static const ff_asf_guid EVENTID_LanguageSpanningEvent =

  345.     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};

  346. static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

  347.     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};

  348. static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

  349.     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};

  350. static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

  351.     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};

  352. static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =

  353.     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};

  354. static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

  355.     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};

  356. static const ff_asf_guid EVENTID_TeletextSpanningEvent =

  357.     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};

  358. static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =

  359.     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};

  360. 

  361. /* Windows media GUIDs */

  362. 

  363. /* Media types */

  364. static const ff_asf_guid mediatype_audio =

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

  366. static const ff_asf_guid mediatype_video =

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

  368. static const ff_asf_guid mediasubtype_mpeg1payload =

  369.     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};

  370. static const ff_asf_guid mediatype_mpeg2_sections =

  371.     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};

  372. static const ff_asf_guid mediatype_mpeg2_pes =

  373.     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  374. static const ff_asf_guid mediatype_mstvcaption =

  375.     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};

  376. 

  377. /* Media subtypes */

  378. static const ff_asf_guid mediasubtype_cpfilters_processed =

  379.     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};

  380. static const ff_asf_guid mediasubtype_dvb_subtitle =

  381.     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};

  382. static const ff_asf_guid mediasubtype_teletext =

  383.     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  384. static const ff_asf_guid mediasubtype_dtvccdata =

  385.     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};

  386. static const ff_asf_guid mediasubtype_mpeg2_sections =

  387.     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};

  388. 

  389. /* Formats */

  390. static const ff_asf_guid format_cpfilters_processed =

  391.     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};

  392. static const ff_asf_guid format_waveformatex =

  393.     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};

  394. static const ff_asf_guid format_videoinfo2 =

  395.     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  396. static const ff_asf_guid format_mpeg2_video =

  397.     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  398. static const ff_asf_guid format_none =

  399.     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};

  400. 

  401. static const AVCodecGuid video_guids[] = {

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

  403.     {AV_CODEC_ID_NONE}

  404. };

  405. 

  406. static int read_probe(AVProbeData *p)

  407. {

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

  409. }

  410. 

  411. /**

  412.  * Convert win32 FILETIME to ISO-8601 string

  413.  */

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

  415. {

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

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

  418.     if (tm)

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

  420.     else

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

  422. }

  423. 

  424. /**

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

  426.  */

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

  428. {

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

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

  431.     if (tm)

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

  433.     else

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

  435. }

  436. 

  437. /**

  438.  * Convert OLE DATE to ISO-8601 string

  439.  */

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

  441. {

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

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

  444.     if (tm)

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

  446.     else

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

  448. }

  449. 

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

  451. {

  452.     char mime[1024];

  453.     char description[1024];

  454.     unsigned int filesize;

  455.     AVStream *st;

  456.     int64_t pos = avio_tell(pb);

  457. 

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

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

  460.         goto done;

  461. 

  462.     avio_r8(pb);

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

  464.     filesize = avio_rl32(pb);

  465.     if (!filesize)

  466.         goto done;

  467. 

  468.     st = avformat_new_stream(s, NULL);

  469.     if (!st)

  470.         goto done;

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

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

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

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

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

  476.         goto done;

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

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

  479. done:

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

  481. }

  482. 

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

  484. {

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

  486.     char *buf = av_malloc(buf_size);

  487.     if (!buf)

  488.         return;

  489. 

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

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

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

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

  494.         if (!strlen(buf)) {

  495.            av_free(buf);

  496.            return;

  497.         }

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

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

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

  501.         int64_t num = avio_rl64(pb);

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

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

  504.             filetime_to_iso8601(buf, buf_size, num);

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

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

  507.             crazytime_to_iso8601(buf, buf_size, num);

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

  509.             oledate_to_iso8601(buf, buf_size, num);

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

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

  512.         else

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

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

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

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

  517.         ff_asf_guid guid;

  518.         avio_read(pb, guid, 16);

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

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

  521.         get_attachment(s, pb, length);

  522.         av_freep(&buf);

  523.         return;

  524.     } else {

  525.         av_freep(&buf);

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

  527.         avio_skip(pb, length);

  528.         return;

  529.     }

  530. 

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

  532.     av_freep(&buf);

  533. }

  534. 

  535. /**

  536.  * Parse metadata entries

  537.  */

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

  539. {

  540.     ff_asf_guid guid;

  541.     int length, type;

  542.     while(!pb->eof_reached) {

  543.         char key[1024];

  544.         ff_get_guid(pb, &guid);

  545.         type   = avio_rl32(pb);

  546.         length = avio_rl32(pb);

  547.         if (!length)

  548.             break;

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

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

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

  552.             break;

  553.         }

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

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

  556.     }

  557. 

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

  559. }

  560. 

  561. /**

  562.  * parse VIDEOINFOHEADER2 structure

  563.  * @return bytes consumed

  564.  */

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

  566. {

  567.     WtvContext *wtv = s->priv_data;

  568.     AVIOContext *pb = wtv->pb;

  569. 

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

  571.     ff_get_bmp_header(pb, st);

  572. 

  573.     return 72 + 40;

  574. }

  575. 

  576. /**

  577.  * Parse MPEG1WAVEFORMATEX extradata structure

  578.  */

  579. static void parse_mpeg1waveformatex(AVStream *st)

  580. {

  581.     /* fwHeadLayer */

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

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

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

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

  586.     }

  587. 

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

  589. 

  590.     /* dwHeadMode */

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

  592.     case 1 :

  593.     case 2 :

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

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

  596.              break;

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

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

  599.              break;

  600.     }

  601. }

  602. 

  603. /**

  604.  * Initialise stream

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

  606.  * @return NULL on error

  607.  */

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

  609. {

  610.     if (st) {

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

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

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

  614.         }

  615.     } else {

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

  617.         if (!wst)

  618.             return NULL;

  619.         st = avformat_new_stream(s, NULL);

  620.         if (!st)

  621.             return NULL;

  622.         st->id = sid;

  623.         st->priv_data = wst;

  624.     }

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

  626.     st->need_parsing      = AVSTREAM_PARSE_FULL;

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

  628.     return st;

  629. }

  630. 

  631. /**

  632.  * parse Media Type structure and populate stream

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

  634.  * @param mediatype  Mediatype GUID

  635.  * @param subtype    Subtype GUID

  636.  * @param formattype Format GUID

  637.  * @param size       Size of format buffer

  638.  * @return NULL on error

  639.  */

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

  641.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  642.                                    ff_asf_guid formattype, int size)

  643. {

  644.     WtvContext *wtv = s->priv_data;

  645.     AVIOContext *pb = wtv->pb;

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

  647.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  648.         ff_asf_guid actual_subtype;

  649.         ff_asf_guid actual_formattype;

  650. 

  651.         if (size < 32) {

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

  653.             avio_skip(pb, size);

  654.             return NULL;

  655.         }

  656. 

  657.         avio_skip(pb, size - 32);

  658.         ff_get_guid(pb, &actual_subtype);

  659.         ff_get_guid(pb, &actual_formattype);

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

  661. 

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

  663.         avio_skip(pb, 32);

  664.         return st;

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

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

  667.         if (!st)

  668.             return NULL;

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

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

  671.             if (ret < 0)

  672.                 return NULL;

  673.         } else {

  674.             if (ff_guidcmp(formattype, format_none))

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

  676.             avio_skip(pb, size);

  677.         }

  678. 

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

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

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

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

  683.                 parse_mpeg1waveformatex(st);

  684.             else

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

  686.         } else {

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

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

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

  690.         }

  691.         return st;

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

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

  694.         if (!st)

  695.             return NULL;

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

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

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

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

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

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

  702.         } else {

  703.             if (ff_guidcmp(formattype, format_none))

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

  705.             avio_skip(pb, size);

  706.         }

  707. 

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

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

  710.         } else {

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

  712.         }

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

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

  715.         return st;

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

  717.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

  719.         if (!st)

  720.             return NULL;

  721.         if (ff_guidcmp(formattype, format_none))

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

  723.         avio_skip(pb, size);

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

  725.         return st;

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

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

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

  729.         if (!st)

  730.             return NULL;

  731.         if (ff_guidcmp(formattype, format_none))

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

  733.         avio_skip(pb, size);

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

  735.         return st;

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

  737.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  738.         if (ff_guidcmp(formattype, format_none))

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

  740.         avio_skip(pb, size);

  741.         return NULL;

  742.     }

  743. 

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

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

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

  747.     avio_skip(pb, size);

  748.     return NULL;

  749. }

  750. 

  751. enum {

  752.     SEEK_TO_DATA = 0,

  753.     SEEK_TO_PTS,

  754. };

  755. 

  756. /**

  757.  * Parse WTV chunks

  758.  * @param mode SEEK_TO_DATA or SEEK_TO_PTS

  759.  * @param seekts timestamp

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

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

  762.  */

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

  764. {

  765.     WtvContext *wtv = s->priv_data;

  766.     AVIOContext *pb = wtv->pb;

  767.     while (!pb->eof_reached) {

  768.         ff_asf_guid g;

  769.         int len, sid, consumed;

  770. 

  771.         ff_get_guid(pb, &g);

  772.         len = avio_rl32(pb);

  773.         if (len < 32)

  774.             break;

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

  776.         avio_skip(pb, 8);

  777.         consumed = 32;

  778. 

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

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

  781.                 ff_asf_guid mediatype, subtype, formattype;

  782.                 int size;

  783.                 avio_skip(pb, 28);

  784.                 ff_get_guid(pb, &mediatype);

  785.                 ff_get_guid(pb, &subtype);

  786.                 avio_skip(pb, 12);

  787.                 ff_get_guid(pb, &formattype);

  788.                 size = avio_rl32(pb);

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

  790.                 consumed += 92 + size;

  791.             }

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

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

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

  795.                 ff_asf_guid mediatype, subtype, formattype;

  796.                 int size;

  797.                 avio_skip(pb, 12);

  798.                 ff_get_guid(pb, &mediatype);

  799.                 ff_get_guid(pb, &subtype);

  800.                 avio_skip(pb, 12);

  801.                 ff_get_guid(pb, &formattype);

  802.                 size = avio_rl32(pb);

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

  804.                 consumed += 76 + size;

  805.             }

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

  807.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  808.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  809.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  810.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  811.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

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

  813.             if (stream_index >= 0) {

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

  815.                 uint8_t buf[258];

  816.                 const uint8_t *pbuf = buf;

  817.                 int buf_size;

  818. 

  819.                 avio_skip(pb, 8);

  820.                 consumed += 8;

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

  822.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  823.                     avio_skip(pb, 6);

  824.                     consumed += 6;

  825.                 }

  826. 

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

  828.                 avio_read(pb, buf, buf_size);

  829.                 consumed += buf_size;

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

  831.             }

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

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

  834.             if (stream_index >= 0) {

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

  836.                 int audio_type;

  837.                 avio_skip(pb, 8);

  838.                 audio_type = avio_r8(pb);

  839.                 if (audio_type == 2)

  840.                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

  841.                 else if (audio_type == 3)

  842.                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  843.                 consumed += 9;

  844.             }

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

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

  847.             if (stream_index >= 0) {

  848.                 avio_skip(pb, 12);

  849.                 if (avio_rl32(pb))

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

  851.                 consumed += 16;

  852.             }

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

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

  855.             if (stream_index >= 0) {

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

  857.                 uint8_t language[4];

  858.                 avio_skip(pb, 12);

  859.                 avio_read(pb, language, 3);

  860.                 if (language[0]) {

  861.                     language[3] = 0;

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

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

  864.                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  865.                 }

  866.                 consumed += 15;

  867.             }

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

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

  870.             if (stream_index >= 0) {

  871.                 avio_skip(pb, 8);

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

  873.                 consumed += 16;

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

  875.                     wtv->pts = AV_NOPTS_VALUE;

  876.                 else {

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

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

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

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

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

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

  883.                     return 0;

  884.                 }

  885.                 }

  886.             }

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

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

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

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

  891.                 wst->seen_data = 1;

  892.                 if (len_ptr) {

  893.                     *len_ptr = len;

  894.                 }

  895.                 return stream_index;

  896.             }

  897.         } else if (

  898.             !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}) ||

  899.             !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}) ||

  900.             !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}) ||

  901.             !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}) ||

  902.             !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}) ||

  903.             !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}) ||

  904.             !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}) ||

  905.             !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}) ||

  906.             !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}) ||

  907.             !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}) ||

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

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

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

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

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

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

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

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

  916.             //ignore known guids

  917.         } else

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

  919. 

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

  921.     }

  922.     return AVERROR_EOF;

  923. }

  924. 

  925. /* declare utf16le strings */

  926. #define _ , 0,

  927. static const uint8_t timeline_le16[] =

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

  929. static const uint8_t table_0_entries_legacy_attrib_le16[] =

  930.     {'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};

  931. static const uint8_t table_0_entries_time_le16[] =

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

  933. static const uint8_t timeline_table_0_entries_Events_le16[] =

  934.     {'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};

  935. #undef _

  936. 

  937. static int read_header(AVFormatContext *s)

  938. {

  939.     WtvContext *wtv = s->priv_data;

  940.     int root_sector, root_size;

  941.     uint8_t root[WTV_SECTOR_SIZE];

  942.     AVIOContext *pb;

  943.     int64_t timeline_pos;

  944.     int ret;

  945. 

  946.     wtv->epoch          =

  947.     wtv->pts            =

  948.     wtv->last_valid_pts = AV_NOPTS_VALUE;

  949. 

  950.     /* read root directory sector */

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

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

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

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

  955.         return AVERROR_INVALIDDATA;

  956.     }

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

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

  959. 

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

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

  962.     if (root_size < 0)

  963.         return AVERROR_INVALIDDATA;

  964. 

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

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

  967.     if (!wtv->pb) {

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

  969.         return AVERROR_INVALIDDATA;

  970.     }

  971. 

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

  973.     if (ret < 0)

  974.         return ret;

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

  976. 

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

  978. 

  979.     /* read metadata */

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

  981.     if (pb) {

  982.         parse_legacy_attrib(s, pb);

  983.         wtvfile_close(pb);

  984.     }

  985. 

  986.     /* read seek index */

  987.     if (s->nb_streams) {

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

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

  990.         if (pb) {

  991.             while(1) {

  992.                 uint64_t timestamp = avio_rl64(pb);

  993.                 uint64_t frame_nb  = avio_rl64(pb);

  994.                 if (pb->eof_reached)

  995.                     break;

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

  997.                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

  998.             }

  999.             wtvfile_close(pb);

  1000. 

  1001.             if (wtv->nb_index_entries) {

  1002.                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);

  1003.                 if (pb) {

  1004.                     int i;

  1005.                     while (1) {

  1006.                         uint64_t frame_nb = avio_rl64(pb);

  1007.                         uint64_t position = avio_rl64(pb);

  1008.                         if (pb->eof_reached)

  1009.                             break;

  1010.                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {

  1011.                             AVIndexEntry *e = wtv->index_entries + i;

  1012.                             if (frame_nb > e->size)

  1013.                                 break;

  1014.                             if (position > e->pos)

  1015.                                 e->pos = position;

  1016.                         }

  1017.                     }

  1018.                     wtvfile_close(pb);

  1019.                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;

  1020.                 }

  1021.             }

  1022.         }

  1023.     }

  1024. 

  1025.     avio_seek(s->pb, timeline_pos, SEEK_SET);

  1026.     return 0;

  1027. }

  1028. 

  1029. static int read_packet(AVFormatContext *s, AVPacket *pkt)

  1030. {

  1031.     WtvContext *wtv = s->priv_data;

  1032.     AVIOContext *pb = wtv->pb;

  1033.     int stream_index, len, ret;

  1034. 

  1035.     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);

  1036.     if (stream_index < 0)

  1037.         return stream_index;

  1038. 

  1039.     ret = av_get_packet(pb, pkt, len - 32);

  1040.     if (ret < 0)

  1041.         return ret;

  1042.     pkt->stream_index = stream_index;

  1043.     pkt->pts          = wtv->pts;

  1044.     avio_skip(pb, WTV_PAD8(len) - len);

  1045.     return 0;

  1046. }

  1047. 

  1048. static int read_seek(AVFormatContext *s, int stream_index,

  1049.                      int64_t ts, int flags)

  1050. {

  1051.     WtvContext *wtv = s->priv_data;

  1052.     AVIOContext *pb = wtv->pb;

  1053.     AVStream *st = s->streams[0];

  1054.     int64_t ts_relative;

  1055.     int i;

  1056. 

  1057.     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

  1058.         return AVERROR(ENOSYS);

  1059. 

  1060.     /* timestamp adjustment is required because wtv->pts values are absolute,

  1061.      * whereas AVIndexEntry->timestamp values are relative to epoch. */

  1062.     ts_relative = ts;

  1063.     if (wtv->epoch != AV_NOPTS_VALUE)

  1064.         ts_relative -= wtv->epoch;

  1065. 

  1066.     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

  1067.     if (i < 0) {

  1068.         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

  1069.             avio_seek(pb, 0, SEEK_SET);

  1070.         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

  1071.             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

  1072.         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)

  1073.             return AVERROR(ERANGE);

  1074.         return 0;

  1075.     }

  1076.     wtv->pts = wtv->index_entries[i].timestamp;

  1077.     if (wtv->epoch != AV_NOPTS_VALUE)

  1078.         wtv->pts += wtv->epoch;

  1079.     wtv->last_valid_pts = wtv->pts;

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

  1081.     return 0;

  1082. }

  1083. 

  1084. static int read_close(AVFormatContext *s)

  1085. {

  1086.     WtvContext *wtv = s->priv_data;

  1087.     av_free(wtv->index_entries);

  1088.     wtvfile_close(wtv->pb);

  1089.     return 0;

  1090. }

  1091. 

  1092. AVInputFormat ff_wtv_demuxer = {

  1093.     .name           = "wtv",

  1094.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),

  1095.     .priv_data_size = sizeof(WtvContext),

  1096.     .read_probe     = read_probe,

  1097.     .read_header    = read_header,

  1098.     .read_packet    = read_packet,

  1099.     .read_seek      = read_seek,

  1100.     .read_close     = read_close,

  1101.     .flags          = AVFMT_SHOW_IDS,

  1102. };