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

  56. 

  57. typedef struct {

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

  59. 

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

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

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

  63. 

  64.     int error;

  65.     int64_t position;

  66.     int64_t length;

  67. } WtvFile;

  68. 

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

  70. {

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

  72. }

  73. 

  74. /**

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

  76.  */

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

  78. {

  79.     WtvFile *wf = opaque;

  80.     AVIOContext *pb = wf->pb_filesystem;

  81.     int nread = 0;

  82. 

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

  84.         return -1;

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

  86.         return 0;

  87. 

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

  89.     while(nread < buf_size) {

  90.         int n;

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

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

  93. 

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

  95.         if (n <= 0)

  96.             break;

  97.         nread += n;

  98.         buf += n;

  99.         wf->position += n;

  100.         if (n == remaining_in_sector) {

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

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

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

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

  105.                 wf->error = 1;

  106.                 break;

  107.             }

  108.         }

  109.     }

  110.     return nread;

  111. }

  112. 

  113. /**

  114.  * @return position (or file length)

  115.  */

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

  117. {

  118.     WtvFile *wf = opaque;

  119.     AVIOContext *pb = wf->pb_filesystem;

  120. 

  121.     if (whence == AVSEEK_SIZE)

  122.         return wf->length;

  123.     else if (whence == SEEK_CUR)

  124.         offset = wf->position + offset;

  125.     else if (whence == SEEK_END)

  126.         offset = wf->length;

  127. 

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

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

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

  131.     wf->position = offset;

  132.     return offset;

  133. }

  134. 

  135. /**

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

  137.  * @param pb

  138.  * @param[out] data destination

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

  140.  * @return    total number of integers read

  141.  */

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

  143. {

  144.     int i, total = 0;

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

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

  147.            total++;

  148.     }

  149.     return total;

  150. }

  151. 

  152. /**

  153.  * Open file

  154.  * @param first_sector  First sector

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

  156.  * @param depth         File allocation table depth

  157.  * @return NULL on error

  158.  */

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

  160. {

  161.     AVIOContext *pb;

  162.     WtvFile *wf;

  163.     uint8_t *buffer;

  164. 

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

  166.         return NULL;

  167. 

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

  169.     if (!wf)

  170.         return NULL;

  171. 

  172.     if (depth == 0) {

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

  174.         if (!wf->sectors) {

  175.             av_free(wf);

  176.             return NULL;

  177.         }

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

  179.         wf->nb_sectors  = 1;

  180.         wf->sector_bits = WTV_SECTOR_BITS;

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

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

  183.         if (!wf->sectors) {

  184.             av_free(wf);

  185.             return NULL;

  186.         }

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

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

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

  190.         uint32_t sectors1[WTV_SECTOR_SIZE / 4];

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

  192.         int i;

  193. 

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

  195.         if (!wf->sectors) {

  196.             av_free(wf);

  197.             return NULL;

  198.         }

  199.         wf->nb_sectors = 0;

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

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

  202.                 break;

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

  204.         }

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

  206.     } else {

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

  208.         av_free(wf);

  209.         return NULL;

  210.     }

  211. 

  212.     if (!wf->nb_sectors) {

  213.         av_free(wf->sectors);

  214.         av_free(wf);

  215.         return NULL;

  216.     }

  217. 

  218.     /* check length */

  219.     length &= 0xFFFFFFFFFFFF;

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

  221.         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);

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

  223.     }

  224.     wf->length = length;

  225. 

  226.     /* seek to initial sector */

  227.     wf->position = 0;

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

  229.         av_free(wf->sectors);

  230.         av_free(wf);

  231.         return NULL;

  232.     }

  233. 

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

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

  236.     if (!buffer) {

  237.         av_free(wf->sectors);

  238.         av_free(wf);

  239.         return NULL;

  240.     }

  241. 

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

  243.                            wtvfile_read_packet, NULL, wtvfile_seek);

  244.     if (!pb) {

  245.         av_free(buffer);

  246.         av_free(wf->sectors);

  247.         av_free(wf);

  248.     }

  249.     return pb;

  250. }

  251. 

  252. static const ff_asf_guid dir_entry_guid =

  253.     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};

  254. 

  255. /**

  256.  * Open file using filename

  257.  * @param[in]  buf       directory buffer

  258.  * @param      buf_size  directory buffer size

  259.  * @param[in]  filename

  260.  * @param      filename_size size of filename

  261.  * @return NULL on error

  262.  */

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

  264. {

  265.     const uint8_t *buf_end = buf + buf_size;

  266. 

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

  268.         int dir_length, name_size, first_sector, depth;

  269.         uint64_t file_length;

  270.         const uint8_t *name;

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

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

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

  274.             break;

  275.         }

  276.         dir_length  = AV_RL16(buf + 16);

  277.         file_length = AV_RL64(buf + 24);

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

  279.         if (name_size < 0) {

  280.             av_log(s, AV_LOG_ERROR,

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

  282.             break;

  283.         }

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

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

  286.             break;

  287.         }

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

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

  290. 

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

  292.         name = buf + 40;

  293.         if (name_size >= filename_size &&

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

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

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

  297. 

  298.         buf += dir_length;

  299.     }

  300.     return 0;

  301. }

  302. 

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

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

  305. 

  306. /**

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

  308.  */

  309. static void wtvfile_close(AVIOContext *pb)

  310. {

  311.     WtvFile *wf = pb->opaque;

  312.     av_free(wf->sectors);

  313.     av_free(wf);

  314.     av_free(pb->buffer);

  315.     av_free(pb);

  316. }

  317. 

  318. /*

  319.  *

  320.  * Main demuxer

  321.  *

  322.  */

  323. 

  324. typedef struct {

  325.     int seen_data;

  326. } WtvStream;

  327. 

  328. typedef struct {

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

  330.     int64_t epoch;

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

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

  333. 

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

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

  336.     AVIndexEntry *index_entries;

  337.     int nb_index_entries;

  338.     unsigned int index_entries_allocated_size;

  339. } WtvContext;

  340. 

  341. /* WTV GUIDs */

  342. static const ff_asf_guid wtv_guid =

  343.     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  344. static const ff_asf_guid metadata_guid =

  345.     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};

  346. static const ff_asf_guid timestamp_guid =

  347.     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};

  348. static const ff_asf_guid data_guid =

  349.     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  350. static const ff_asf_guid stream_guid =

  351.     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};

  352. static const ff_asf_guid stream2_guid =

  353.     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  354. static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

  355.     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};

  356. static const ff_asf_guid EVENTID_LanguageSpanningEvent =

  357.     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};

  358. static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

  359.     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};

  360. static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

  361.     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};

  362. static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

  363.     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};

  364. static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =

  365.     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};

  366. static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

  367.     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};

  368. static const ff_asf_guid EVENTID_TeletextSpanningEvent =

  369.     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};

  370. static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =

  371.     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};

  372. 

  373. /* Windows media GUIDs */

  374. 

  375. /* Media types */

  376. static const ff_asf_guid mediatype_audio =

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

  378. static const ff_asf_guid mediatype_video =

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

  380. static const ff_asf_guid mediasubtype_mpeg1payload =

  381.     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};

  382. static const ff_asf_guid mediatype_mpeg2_sections =

  383.     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};

  384. static const ff_asf_guid mediatype_mpeg2_pes =

  385.     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  386. static const ff_asf_guid mediatype_mstvcaption =

  387.     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};

  388. 

  389. /* Media subtypes */

  390. static const ff_asf_guid mediasubtype_cpfilters_processed =

  391.     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};

  392. static const ff_asf_guid mediasubtype_dvb_subtitle =

  393.     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};

  394. static const ff_asf_guid mediasubtype_teletext =

  395.     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  396. static const ff_asf_guid mediasubtype_dtvccdata =

  397.     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};

  398. static const ff_asf_guid mediasubtype_mpeg2_sections =

  399.     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};

  400. 

  401. /* Formats */

  402. static const ff_asf_guid format_cpfilters_processed =

  403.     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};

  404. static const ff_asf_guid format_waveformatex =

  405.     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};

  406. static const ff_asf_guid format_videoinfo2 =

  407.     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  408. static const ff_asf_guid format_mpeg2_video =

  409.     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  410. static const ff_asf_guid format_none =

  411.     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};

  412. 

  413. static const AVCodecGuid video_guids[] = {

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

  415.     {AV_CODEC_ID_NONE}

  416. };

  417. 

  418. static int read_probe(AVProbeData *p)

  419. {

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

  421. }

  422. 

  423. /**

  424.  * Convert win32 FILETIME to ISO-8601 string

  425.  */

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

  427. {

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

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

  430.     if (tm)

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

  432.     else

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

  434. }

  435. 

  436. /**

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

  438.  */

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

  440. {

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

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

  443.     if (tm)

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

  445.     else

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

  447. }

  448. 

  449. /**

  450.  * Convert OLE DATE to ISO-8601 string

  451.  */

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

  453. {

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

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

  456.     if (tm)

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

  458.     else

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

  460. }

  461. 

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

  463. {

  464.     char mime[1024];

  465.     char description[1024];

  466.     unsigned int filesize;

  467.     AVStream *st;

  468.     int64_t pos = avio_tell(pb);

  469. 

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

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

  472.         goto done;

  473. 

  474.     avio_r8(pb);

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

  476.     filesize = avio_rl32(pb);

  477.     if (!filesize)

  478.         goto done;

  479. 

  480.     st = avformat_new_stream(s, NULL);

  481.     if (!st)

  482.         goto done;

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

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

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

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

  487.     st->id = -1;

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

  489.         goto done;

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

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

  492. done:

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

  494. }

  495. 

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

  497. {

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

  499.     char *buf = av_malloc(buf_size);

  500.     if (!buf)

  501.         return;

  502. 

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

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

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

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

  507.         if (!strlen(buf)) {

  508.            av_free(buf);

  509.            return;

  510.         }

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

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

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

  514.         int64_t num = avio_rl64(pb);

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

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

  517.             filetime_to_iso8601(buf, buf_size, num);

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

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

  520.             crazytime_to_iso8601(buf, buf_size, num);

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

  522.             oledate_to_iso8601(buf, buf_size, num);

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

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

  525.         else

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

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

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

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

  530.         ff_asf_guid guid;

  531.         avio_read(pb, guid, 16);

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

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

  534.         get_attachment(s, pb, length);

  535.         av_freep(&buf);

  536.         return;

  537.     } else {

  538.         av_freep(&buf);

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

  540.         avio_skip(pb, length);

  541.         return;

  542.     }

  543. 

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

  545.     av_freep(&buf);

  546. }

  547. 

  548. /**

  549.  * Parse metadata entries

  550.  */

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

  552. {

  553.     ff_asf_guid guid;

  554.     int length, type;

  555.     while(!pb->eof_reached) {

  556.         char key[1024];

  557.         ff_get_guid(pb, &guid);

  558.         type   = avio_rl32(pb);

  559.         length = avio_rl32(pb);

  560.         if (!length)

  561.             break;

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

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

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

  565.             break;

  566.         }

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

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

  569.     }

  570. 

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

  572. }

  573. 

  574. /**

  575.  * parse VIDEOINFOHEADER2 structure

  576.  * @return bytes consumed

  577.  */

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

  579. {

  580.     WtvContext *wtv = s->priv_data;

  581.     AVIOContext *pb = wtv->pb;

  582. 

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

  584.     ff_get_bmp_header(pb, st);

  585. 

  586.     return 72 + 40;

  587. }

  588. 

  589. /**

  590.  * Parse MPEG1WAVEFORMATEX extradata structure

  591.  */

  592. static void parse_mpeg1waveformatex(AVStream *st)

  593. {

  594.     /* fwHeadLayer */

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

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

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

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

  599.     }

  600. 

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

  602. 

  603.     /* dwHeadMode */

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

  605.     case 1 :

  606.     case 2 :

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

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

  609.              break;

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

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

  612.              break;

  613.     }

  614. }

  615. 

  616. /**

  617.  * Initialise stream

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

  619.  * @return NULL on error

  620.  */

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

  622. {

  623.     if (st) {

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

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

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

  627.         }

  628.     } else {

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

  630.         if (!wst)

  631.             return NULL;

  632.         st = avformat_new_stream(s, NULL);

  633.         if (!st)

  634.             return NULL;

  635.         st->id = sid;

  636.         st->priv_data = wst;

  637.     }

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

  639.     st->need_parsing      = AVSTREAM_PARSE_FULL;

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

  641.     return st;

  642. }

  643. 

  644. /**

  645.  * parse Media Type structure and populate stream

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

  647.  * @param mediatype  Mediatype GUID

  648.  * @param subtype    Subtype GUID

  649.  * @param formattype Format GUID

  650.  * @param size       Size of format buffer

  651.  * @return NULL on error

  652.  */

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

  654.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  655.                                    ff_asf_guid formattype, int size)

  656. {

  657.     WtvContext *wtv = s->priv_data;

  658.     AVIOContext *pb = wtv->pb;

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

  660.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  661.         ff_asf_guid actual_subtype;

  662.         ff_asf_guid actual_formattype;

  663. 

  664.         if (size < 32) {

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

  666.             avio_skip(pb, size);

  667.             return NULL;

  668.         }

  669. 

  670.         avio_skip(pb, size - 32);

  671.         ff_get_guid(pb, &actual_subtype);

  672.         ff_get_guid(pb, &actual_formattype);

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

  674. 

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

  676.         avio_skip(pb, 32);

  677.         return st;

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

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

  680.         if (!st)

  681.             return NULL;

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

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

  684.             if (ret < 0)

  685.                 return NULL;

  686.         } else {

  687.             if (ff_guidcmp(formattype, format_none))

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

  689.             avio_skip(pb, size);

  690.         }

  691. 

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

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

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

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

  696.                 parse_mpeg1waveformatex(st);

  697.             else

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

  699.         } else {

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

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

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

  703.         }

  704.         return st;

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

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

  707.         if (!st)

  708.             return NULL;

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

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

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

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

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

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

  715.         } else {

  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.         }

  720. 

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

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

  723.         } else {

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

  725.         }

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

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

  728.         return st;

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

  730.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

  732.         if (!st)

  733.             return NULL;

  734.         if (ff_guidcmp(formattype, format_none))

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

  736.         avio_skip(pb, size);

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

  738.         return st;

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

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

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

  742.         if (!st)

  743.             return NULL;

  744.         if (ff_guidcmp(formattype, format_none))

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

  746.         avio_skip(pb, size);

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

  748.         return st;

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

  750.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  751.         if (ff_guidcmp(formattype, format_none))

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

  753.         avio_skip(pb, size);

  754.         return NULL;

  755.     }

  756. 

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

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

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

  760.     avio_skip(pb, size);

  761.     return NULL;

  762. }

  763. 

  764. enum {

  765.     SEEK_TO_DATA = 0,

  766.     SEEK_TO_PTS,

  767. };

  768. 

  769. /**

  770.  * Parse WTV chunks

  771.  * @param mode SEEK_TO_DATA or SEEK_TO_PTS

  772.  * @param seekts timestamp

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

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

  775.  */

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

  777. {

  778.     WtvContext *wtv = s->priv_data;

  779.     AVIOContext *pb = wtv->pb;

  780.     while (!pb->eof_reached) {

  781.         ff_asf_guid g;

  782.         int len, sid, consumed;

  783. 

  784.         ff_get_guid(pb, &g);

  785.         len = avio_rl32(pb);

  786.         if (len < 32)

  787.             break;

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

  789.         avio_skip(pb, 8);

  790.         consumed = 32;

  791. 

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

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

  794.                 ff_asf_guid mediatype, subtype, formattype;

  795.                 int size;

  796.                 avio_skip(pb, 28);

  797.                 ff_get_guid(pb, &mediatype);

  798.                 ff_get_guid(pb, &subtype);

  799.                 avio_skip(pb, 12);

  800.                 ff_get_guid(pb, &formattype);

  801.                 size = avio_rl32(pb);

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

  803.                 consumed += 92 + size;

  804.             }

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

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

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

  808.                 ff_asf_guid mediatype, subtype, formattype;

  809.                 int size;

  810.                 avio_skip(pb, 12);

  811.                 ff_get_guid(pb, &mediatype);

  812.                 ff_get_guid(pb, &subtype);

  813.                 avio_skip(pb, 12);

  814.                 ff_get_guid(pb, &formattype);

  815.                 size = avio_rl32(pb);

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

  817.                 consumed += 76 + size;

  818.             }

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

  820.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  821.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  822.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  823.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  824.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

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

  826.             if (stream_index >= 0) {

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

  828.                 uint8_t buf[258];

  829.                 const uint8_t *pbuf = buf;

  830.                 int buf_size;

  831. 

  832.                 avio_skip(pb, 8);

  833.                 consumed += 8;

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

  835.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  836.                     avio_skip(pb, 6);

  837.                     consumed += 6;

  838.                 }

  839. 

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

  841.                 avio_read(pb, buf, buf_size);

  842.                 consumed += buf_size;

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

  844.             }

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

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

  847.             if (stream_index >= 0) {

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

  849.                 int audio_type;

  850.                 avio_skip(pb, 8);

  851.                 audio_type = avio_r8(pb);

  852.                 if (audio_type == 2)

  853.                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

  854.                 else if (audio_type == 3)

  855.                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  856.                 consumed += 9;

  857.             }

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

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

  860.             if (stream_index >= 0) {

  861.                 avio_skip(pb, 12);

  862.                 if (avio_rl32(pb))

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

  864.                 consumed += 16;

  865.             }

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

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

  868.             if (stream_index >= 0) {

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

  870.                 uint8_t language[4];

  871.                 avio_skip(pb, 12);

  872.                 avio_read(pb, language, 3);

  873.                 if (language[0]) {

  874.                     language[3] = 0;

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

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

  877.                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  878.                 }

  879.                 consumed += 15;

  880.             }

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

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

  883.             if (stream_index >= 0) {

  884.                 avio_skip(pb, 8);

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

  886.                 consumed += 16;

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

  888.                     wtv->pts = AV_NOPTS_VALUE;

  889.                 else {

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

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

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

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

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

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

  896.                     return 0;

  897.                 }

  898.                 }

  899.             }

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

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

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

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

  904.                 wst->seen_data = 1;

  905.                 if (len_ptr) {

  906.                     *len_ptr = len;

  907.                 }

  908.                 return stream_index;

  909.             }

  910.         } else if (

  911.             !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}) ||

  912.             !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}) ||

  913.             !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}) ||

  914.             !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}) ||

  915.             !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}) ||

  916.             !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}) ||

  917.             !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}) ||

  918.             !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}) ||

  919.             !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}) ||

  920.             !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}) ||

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

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

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

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

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

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

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

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

  929.             //ignore known guids

  930.         } else

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

  932. 

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

  934.     }

  935.     return AVERROR_EOF;

  936. }

  937. 

  938. /* declare utf16le strings */

  939. #define _ , 0,

  940. static const uint8_t timeline_le16[] =

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

  942. static const uint8_t table_0_entries_legacy_attrib_le16[] =

  943.     {'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};

  944. static const uint8_t table_0_entries_time_le16[] =

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

  946. static const uint8_t timeline_table_0_entries_Events_le16[] =

  947.     {'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};

  948. #undef _

  949. 

  950. static int read_header(AVFormatContext *s)

  951. {

  952.     WtvContext *wtv = s->priv_data;

  953.     int root_sector, root_size;

  954.     uint8_t root[WTV_SECTOR_SIZE];

  955.     AVIOContext *pb;

  956.     int64_t timeline_pos;

  957.     int ret;

  958. 

  959.     wtv->epoch          =

  960.     wtv->pts            =

  961.     wtv->last_valid_pts = AV_NOPTS_VALUE;

  962. 

  963.     /* read root directory sector */

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

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

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

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

  968.         return AVERROR_INVALIDDATA;

  969.     }

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

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

  972. 

  973.     seek_by_sector(s->pb, root_sector, 0);

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

  975.     if (root_size < 0)

  976.         return AVERROR_INVALIDDATA;

  977. 

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

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

  980.     if (!wtv->pb) {

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

  982.         return AVERROR_INVALIDDATA;

  983.     }

  984. 

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

  986.     if (ret < 0)

  987.         return ret;

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

  989. 

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

  991. 

  992.     /* read metadata */

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

  994.     if (pb) {

  995.         parse_legacy_attrib(s, pb);

  996.         wtvfile_close(pb);

  997.     }

  998. 

  999.     /* read seek index */

  1000.     if (s->nb_streams) {

  1001.         AVStream *st = s->streams[0];

  1002.         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);

  1003.         if (pb) {

  1004.             while(1) {

  1005.                 uint64_t timestamp = avio_rl64(pb);

  1006.                 uint64_t frame_nb  = avio_rl64(pb);

  1007.                 if (pb->eof_reached)

  1008.                     break;

  1009.                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,

  1010.                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

  1011.             }

  1012.             wtvfile_close(pb);

  1013. 

  1014.             if (wtv->nb_index_entries) {

  1015.                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);

  1016.                 if (pb) {

  1017.                     int i;

  1018.                     while (1) {

  1019.                         uint64_t frame_nb = avio_rl64(pb);

  1020.                         uint64_t position = avio_rl64(pb);

  1021.                         if (pb->eof_reached)

  1022.                             break;

  1023.                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {

  1024.                             AVIndexEntry *e = wtv->index_entries + i;

  1025.                             if (frame_nb > e->size)

  1026.                                 break;

  1027.                             if (position > e->pos)

  1028.                                 e->pos = position;

  1029.                         }

  1030.                     }

  1031.                     wtvfile_close(pb);

  1032.                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;

  1033.                 }

  1034.             }

  1035.         }

  1036.     }

  1037. 

  1038.     avio_seek(s->pb, timeline_pos, SEEK_SET);

  1039.     return 0;

  1040. }

  1041. 

  1042. static int read_packet(AVFormatContext *s, AVPacket *pkt)

  1043. {

  1044.     WtvContext *wtv = s->priv_data;

  1045.     AVIOContext *pb = wtv->pb;

  1046.     int stream_index, len, ret;

  1047. 

  1048.     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);

  1049.     if (stream_index < 0)

  1050.         return stream_index;

  1051. 

  1052.     ret = av_get_packet(pb, pkt, len - 32);

  1053.     if (ret < 0)

  1054.         return ret;

  1055.     pkt->stream_index = stream_index;

  1056.     pkt->pts          = wtv->pts;

  1057.     avio_skip(pb, WTV_PAD8(len) - len);

  1058.     return 0;

  1059. }

  1060. 

  1061. static int read_seek(AVFormatContext *s, int stream_index,

  1062.                      int64_t ts, int flags)

  1063. {

  1064.     WtvContext *wtv = s->priv_data;

  1065.     AVIOContext *pb = wtv->pb;

  1066.     AVStream *st = s->streams[0];

  1067.     int64_t ts_relative;

  1068.     int i;

  1069. 

  1070.     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

  1071.         return AVERROR(ENOSYS);

  1072. 

  1073.     /* timestamp adjustment is required because wtv->pts values are absolute,

  1074.      * whereas AVIndexEntry->timestamp values are relative to epoch. */

  1075.     ts_relative = ts;

  1076.     if (wtv->epoch != AV_NOPTS_VALUE)

  1077.         ts_relative -= wtv->epoch;

  1078. 

  1079.     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

  1080.     if (i < 0) {

  1081.         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

  1082.             avio_seek(pb, 0, SEEK_SET);

  1083.         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

  1084.             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

  1085.         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)

  1086.             return AVERROR(ERANGE);

  1087.         return 0;

  1088.     }

  1089.     wtv->pts = wtv->index_entries[i].timestamp;

  1090.     if (wtv->epoch != AV_NOPTS_VALUE)

  1091.         wtv->pts += wtv->epoch;

  1092.     wtv->last_valid_pts = wtv->pts;

  1093.     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);

  1094.     return 0;

  1095. }

  1096. 

  1097. static int read_close(AVFormatContext *s)

  1098. {

  1099.     WtvContext *wtv = s->priv_data;

  1100.     av_free(wtv->index_entries);

  1101.     wtvfile_close(wtv->pb);

  1102.     return 0;

  1103. }

  1104. 

  1105. AVInputFormat ff_wtv_demuxer = {

  1106.     .name           = "wtv",

  1107.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),

  1108.     .priv_data_size = sizeof(WtvContext),

  1109.     .read_probe     = read_probe,

  1110.     .read_header    = read_header,

  1111.     .read_packet    = read_packet,

  1112.     .read_seek      = read_seek,

  1113.     .read_close     = read_close,

  1114.     .flags          = AVFMT_SHOW_IDS,

  1115. };