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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 <inttypes.h>

  29. 

  30. #include "libavutil/channel_layout.h"

  31. #include "libavutil/intreadwrite.h"

  32. #include "libavutil/intfloat.h"

  33. #include "libavutil/dict.h"

  34. #include "avformat.h"

  35. #include "internal.h"

  36. #include "riff.h"

  37. #include "asf.h"

  38. #include "mpegts.h"

  39. 

  40. /* Macros for formating GUIDs */

  41. #define PRI_PRETTY_GUID \

  42.     "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"

  43. #define ARG_PRETTY_GUID(g) \

  44.     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]

  45. #define LEN_PRETTY_GUID 34

  46. 

  47. /*

  48.  *

  49.  * File system routines

  50.  *

  51.  */

  52. 

  53. #define WTV_SECTOR_BITS    12

  54. #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)

  55. #define WTV_BIGSECTOR_BITS 18

  56. 

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

  58. 

  59. typedef struct {

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

  61. 

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

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

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

  65. 

  66.     int error;

  67.     int64_t position;

  68.     int64_t length;

  69. } WtvFile;

  70. 

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

  72. {

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

  74. }

  75. 

  76. /**

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

  78.  */

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

  80. {

  81.     WtvFile *wf = opaque;

  82.     AVIOContext *pb = wf->pb_filesystem;

  83.     int nread = 0;

  84. 

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

  86.         return -1;

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

  88.         return 0;

  89. 

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

  91.     while(nread < buf_size) {

  92.         int n;

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

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

  95. 

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

  97.         if (n <= 0)

  98.             break;

  99.         nread += n;

  100.         buf += n;

  101.         wf->position += n;

  102.         if (n == remaining_in_sector) {

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

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

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

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

  107.                 wf->error = 1;

  108.                 break;

  109.             }

  110.         }

  111.     }

  112.     return nread;

  113. }

  114. 

  115. /**

  116.  * @return position (or file length)

  117.  */

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

  119. {

  120.     WtvFile *wf = opaque;

  121.     AVIOContext *pb = wf->pb_filesystem;

  122. 

  123.     if (whence == AVSEEK_SIZE)

  124.         return wf->length;

  125.     else if (whence == SEEK_CUR)

  126.         offset = wf->position + offset;

  127.     else if (whence == SEEK_END)

  128.         offset = wf->length;

  129. 

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

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

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

  133.     wf->position = offset;

  134.     return offset;

  135. }

  136. 

  137. /**

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

  139.  * @param pb

  140.  * @param[out] data destination

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

  142.  * @return    total number of integers read

  143.  */

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

  145. {

  146.     int i, total = 0;

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

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

  149.            total++;

  150.     }

  151.     return total;

  152. }

  153. 

  154. /**

  155.  * Open file

  156.  * @param first_sector  First sector

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

  158.  * @param depth         File allocation table depth

  159.  * @return NULL on error

  160.  */

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

  162. {

  163.     AVIOContext *pb;

  164.     WtvFile *wf;

  165.     uint8_t *buffer;

  166. 

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

  168.         return NULL;

  169. 

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

  171.     if (!wf)

  172.         return NULL;

  173. 

  174.     if (depth == 0) {

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

  176.         if (!wf->sectors) {

  177.             av_free(wf);

  178.             return NULL;

  179.         }

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

  181.         wf->nb_sectors  = 1;

  182.         wf->sector_bits = WTV_SECTOR_BITS;

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

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

  185.         if (!wf->sectors) {

  186.             av_free(wf);

  187.             return NULL;

  188.         }

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

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

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

  192.         uint32_t sectors1[WTV_SECTOR_SIZE / 4];

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

  194.         int i;

  195. 

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

  197.         if (!wf->sectors) {

  198.             av_free(wf);

  199.             return NULL;

  200.         }

  201.         wf->nb_sectors = 0;

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

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

  204.                 break;

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

  206.         }

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

  208.     } else {

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

  210.         av_free(wf);

  211.         return NULL;

  212.     }

  213. 

  214.     if (!wf->nb_sectors) {

  215.         av_free(wf->sectors);

  216.         av_free(wf);

  217.         return NULL;

  218.     }

  219. 

  220.     /* check length */

  221.     length &= 0xFFFFFFFFFFFF;

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

  223.         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);

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

  225.     }

  226.     wf->length = length;

  227. 

  228.     /* seek to initial sector */

  229.     wf->position = 0;

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

  231.         av_free(wf->sectors);

  232.         av_free(wf);

  233.         return NULL;

  234.     }

  235. 

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

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

  238.     if (!buffer) {

  239.         av_free(wf->sectors);

  240.         av_free(wf);

  241.         return NULL;

  242.     }

  243. 

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

  245.                            wtvfile_read_packet, NULL, wtvfile_seek);

  246.     if (!pb) {

  247.         av_free(buffer);

  248.         av_free(wf->sectors);

  249.         av_free(wf);

  250.     }

  251.     return pb;

  252. }

  253. 

  254. static const ff_asf_guid dir_entry_guid =

  255.     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};

  256. 

  257. /**

  258.  * Open file using filename

  259.  * @param[in]  buf       directory buffer

  260.  * @param      buf_size  directory buffer size

  261.  * @param[in]  filename

  262.  * @param      filename_size size of filename

  263.  * @return NULL on error

  264.  */

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

  266. {

  267.     const uint8_t *buf_end = buf + buf_size;

  268. 

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

  270.         int dir_length, name_size, first_sector, depth;

  271.         uint64_t file_length;

  272.         const uint8_t *name;

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

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

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

  276.             break;

  277.         }

  278.         dir_length  = AV_RL16(buf + 16);

  279.         file_length = AV_RL64(buf + 24);

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

  281.         if (name_size < 0) {

  282.             av_log(s, AV_LOG_ERROR,

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

  284.             break;

  285.         }

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

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

  288.             break;

  289.         }

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

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

  292. 

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

  294.         name = buf + 40;

  295.         if (name_size >= filename_size &&

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

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

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

  299. 

  300.         buf += dir_length;

  301.     }

  302.     return 0;

  303. }

  304. 

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

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

  307. 

  308. /**

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

  310.  */

  311. static void wtvfile_close(AVIOContext *pb)

  312. {

  313.     WtvFile *wf = pb->opaque;

  314.     av_free(wf->sectors);

  315.     av_free(wf);

  316.     av_free(pb->buffer);

  317.     av_free(pb);

  318. }

  319. 

  320. /*

  321.  *

  322.  * Main demuxer

  323.  *

  324.  */

  325. 

  326. typedef struct {

  327.     int seen_data;

  328. } WtvStream;

  329. 

  330. typedef struct {

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

  332.     int64_t epoch;

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

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

  335. 

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

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

  338.     AVIndexEntry *index_entries;

  339.     int nb_index_entries;

  340.     unsigned int index_entries_allocated_size;

  341. } WtvContext;

  342. 

  343. /* WTV GUIDs */

  344. static const ff_asf_guid wtv_guid =

  345.     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  346. static const ff_asf_guid metadata_guid =

  347.     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};

  348. static const ff_asf_guid timestamp_guid =

  349.     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};

  350. static const ff_asf_guid data_guid =

  351.     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  352. static const ff_asf_guid stream_guid =

  353.     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};

  354. static const ff_asf_guid stream2_guid =

  355.     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  356. static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

  357.     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};

  358. static const ff_asf_guid EVENTID_LanguageSpanningEvent =

  359.     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};

  360. static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

  361.     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};

  362. static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

  363.     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};

  364. static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

  365.     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};

  366. static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =

  367.     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};

  368. static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

  369.     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};

  370. static const ff_asf_guid EVENTID_TeletextSpanningEvent =

  371.     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};

  372. static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =

  373.     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};

  374. 

  375. /* Windows media GUIDs */

  376. 

  377. /* Media types */

  378. static const ff_asf_guid mediatype_audio =

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

  380. static const ff_asf_guid mediatype_video =

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

  382. static const ff_asf_guid mediasubtype_mpeg1payload =

  383.     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};

  384. static const ff_asf_guid mediatype_mpeg2_sections =

  385.     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};

  386. static const ff_asf_guid mediatype_mpeg2_pes =

  387.     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  388. static const ff_asf_guid mediatype_mstvcaption =

  389.     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};

  390. 

  391. /* Media subtypes */

  392. static const ff_asf_guid mediasubtype_cpfilters_processed =

  393.     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};

  394. static const ff_asf_guid mediasubtype_dvb_subtitle =

  395.     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};

  396. static const ff_asf_guid mediasubtype_teletext =

  397.     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  398. static const ff_asf_guid mediasubtype_dtvccdata =

  399.     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};

  400. static const ff_asf_guid mediasubtype_mpeg2_sections =

  401.     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};

  402. 

  403. /* Formats */

  404. static const ff_asf_guid format_cpfilters_processed =

  405.     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};

  406. static const ff_asf_guid format_waveformatex =

  407.     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};

  408. static const ff_asf_guid format_videoinfo2 =

  409.     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  410. static const ff_asf_guid format_mpeg2_video =

  411.     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  412. static const ff_asf_guid format_none =

  413.     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};

  414. 

  415. static const AVCodecGuid video_guids[] = {

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

  417.     {AV_CODEC_ID_NONE}

  418. };

  419. 

  420. static int read_probe(AVProbeData *p)

  421. {

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

  423. }

  424. 

  425. /**

  426.  * Convert win32 FILETIME to ISO-8601 string

  427.  */

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

  429. {

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

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

  432.     if (tm)

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

  434.     else

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

  436. }

  437. 

  438. /**

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

  440.  */

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

  442. {

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

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

  445.     if (tm)

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

  447.     else

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

  449. }

  450. 

  451. /**

  452.  * Convert OLE DATE to ISO-8601 string

  453.  */

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

  455. {

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

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

  458.     if (tm)

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

  460.     else

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

  462. }

  463. 

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

  465. {

  466.     char mime[1024];

  467.     char description[1024];

  468.     unsigned int filesize;

  469.     AVStream *st;

  470.     int64_t pos = avio_tell(pb);

  471. 

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

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

  474.         goto done;

  475. 

  476.     avio_r8(pb);

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

  478.     filesize = avio_rl32(pb);

  479.     if (!filesize)

  480.         goto done;

  481. 

  482.     st = avformat_new_stream(s, NULL);

  483.     if (!st)

  484.         goto done;

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

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

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

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

  489.     st->id = -1;

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

  491.         goto done;

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

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

  494. done:

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

  496. }

  497. 

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

  499. {

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

  501.     char *buf = av_malloc(buf_size);

  502.     if (!buf)

  503.         return;

  504. 

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

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

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

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

  509.         if (!strlen(buf)) {

  510.            av_free(buf);

  511.            return;

  512.         }

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

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

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

  516.         int64_t num = avio_rl64(pb);

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

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

  519.             filetime_to_iso8601(buf, buf_size, num);

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

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

  522.             crazytime_to_iso8601(buf, buf_size, num);

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

  524.             oledate_to_iso8601(buf, buf_size, num);

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

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

  527.         else

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

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

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

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

  532.         ff_asf_guid guid;

  533.         avio_read(pb, guid, 16);

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

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

  536.         get_attachment(s, pb, length);

  537.         av_freep(&buf);

  538.         return;

  539.     } else {

  540.         av_freep(&buf);

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

  542.         avio_skip(pb, length);

  543.         return;

  544.     }

  545. 

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

  547.     av_freep(&buf);

  548. }

  549. 

  550. /**

  551.  * Parse metadata entries

  552.  */

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

  554. {

  555.     ff_asf_guid guid;

  556.     int length, type;

  557.     while(!pb->eof_reached) {

  558.         char key[1024];

  559.         ff_get_guid(pb, &guid);

  560.         type   = avio_rl32(pb);

  561.         length = avio_rl32(pb);

  562.         if (!length)

  563.             break;

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

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

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

  567.             break;

  568.         }

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

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

  571.     }

  572. 

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

  574. }

  575. 

  576. /**

  577.  * parse VIDEOINFOHEADER2 structure

  578.  * @return bytes consumed

  579.  */

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

  581. {

  582.     WtvContext *wtv = s->priv_data;

  583.     AVIOContext *pb = wtv->pb;

  584. 

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

  586.     ff_get_bmp_header(pb, st);

  587. 

  588.     return 72 + 40;

  589. }

  590. 

  591. /**

  592.  * Parse MPEG1WAVEFORMATEX extradata structure

  593.  */

  594. static void parse_mpeg1waveformatex(AVStream *st)

  595. {

  596.     /* fwHeadLayer */

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

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

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

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

  601.     }

  602. 

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

  604. 

  605.     /* dwHeadMode */

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

  607.     case 1 :

  608.     case 2 :

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

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

  611.              break;

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

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

  614.              break;

  615.     }

  616. }

  617. 

  618. /**

  619.  * Initialise stream

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

  621.  * @return NULL on error

  622.  */

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

  624. {

  625.     if (st) {

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

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

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

  629.         }

  630.     } else {

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

  632.         if (!wst)

  633.             return NULL;

  634.         st = avformat_new_stream(s, NULL);

  635.         if (!st)

  636.             return NULL;

  637.         st->id = sid;

  638.         st->priv_data = wst;

  639.     }

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

  641.     st->need_parsing      = AVSTREAM_PARSE_FULL;

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

  643.     return st;

  644. }

  645. 

  646. /**

  647.  * parse Media Type structure and populate stream

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

  649.  * @param mediatype  Mediatype GUID

  650.  * @param subtype    Subtype GUID

  651.  * @param formattype Format GUID

  652.  * @param size       Size of format buffer

  653.  * @return NULL on error

  654.  */

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

  656.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  657.                                    ff_asf_guid formattype, int size)

  658. {

  659.     WtvContext *wtv = s->priv_data;

  660.     AVIOContext *pb = wtv->pb;

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

  662.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  663.         ff_asf_guid actual_subtype;

  664.         ff_asf_guid actual_formattype;

  665. 

  666.         if (size < 32) {

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

  668.             avio_skip(pb, size);

  669.             return NULL;

  670.         }

  671. 

  672.         avio_skip(pb, size - 32);

  673.         ff_get_guid(pb, &actual_subtype);

  674.         ff_get_guid(pb, &actual_formattype);

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

  676. 

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

  678.         avio_skip(pb, 32);

  679.         return st;

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

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

  682.         if (!st)

  683.             return NULL;

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

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

  686.             if (ret < 0)

  687.                 return NULL;

  688.         } else {

  689.             if (ff_guidcmp(formattype, format_none))

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

  691.             avio_skip(pb, size);

  692.         }

  693. 

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

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

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

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

  698.                 parse_mpeg1waveformatex(st);

  699.             else

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

  701.         } else {

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

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

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

  705.         }

  706.         return st;

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

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

  709.         if (!st)

  710.             return NULL;

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

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

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

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

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

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

  717.         } else {

  718.             if (ff_guidcmp(formattype, format_none))

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

  720.             avio_skip(pb, size);

  721.         }

  722. 

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

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

  725.         } else {

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

  727.         }

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

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

  730.         return st;

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

  732.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

  734.         if (!st)

  735.             return NULL;

  736.         if (ff_guidcmp(formattype, format_none))

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

  738.         avio_skip(pb, size);

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

  740.         return st;

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

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

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

  744.         if (!st)

  745.             return NULL;

  746.         if (ff_guidcmp(formattype, format_none))

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

  748.         avio_skip(pb, size);

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

  750.         return st;

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

  752.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  753.         if (ff_guidcmp(formattype, format_none))

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

  755.         avio_skip(pb, size);

  756.         return NULL;

  757.     }

  758. 

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

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

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

  762.     avio_skip(pb, size);

  763.     return NULL;

  764. }

  765. 

  766. enum {

  767.     SEEK_TO_DATA = 0,

  768.     SEEK_TO_PTS,

  769. };

  770. 

  771. /**

  772.  * Parse WTV chunks

  773.  * @param mode SEEK_TO_DATA or SEEK_TO_PTS

  774.  * @param seekts timestamp

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

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

  777.  */

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

  779. {

  780.     WtvContext *wtv = s->priv_data;

  781.     AVIOContext *pb = wtv->pb;

  782.     while (!pb->eof_reached) {

  783.         ff_asf_guid g;

  784.         int len, sid, consumed;

  785. 

  786.         ff_get_guid(pb, &g);

  787.         len = avio_rl32(pb);

  788.         if (len < 32)

  789.             break;

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

  791.         avio_skip(pb, 8);

  792.         consumed = 32;

  793. 

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

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

  796.                 ff_asf_guid mediatype, subtype, formattype;

  797.                 int size;

  798.                 avio_skip(pb, 28);

  799.                 ff_get_guid(pb, &mediatype);

  800.                 ff_get_guid(pb, &subtype);

  801.                 avio_skip(pb, 12);

  802.                 ff_get_guid(pb, &formattype);

  803.                 size = avio_rl32(pb);

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

  805.                 consumed += 92 + size;

  806.             }

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

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

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

  810.                 ff_asf_guid mediatype, subtype, formattype;

  811.                 int size;

  812.                 avio_skip(pb, 12);

  813.                 ff_get_guid(pb, &mediatype);

  814.                 ff_get_guid(pb, &subtype);

  815.                 avio_skip(pb, 12);

  816.                 ff_get_guid(pb, &formattype);

  817.                 size = avio_rl32(pb);

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

  819.                 consumed += 76 + size;

  820.             }

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

  822.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  823.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  824.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  825.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  826.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

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

  828.             if (stream_index >= 0) {

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

  830.                 uint8_t buf[258];

  831.                 const uint8_t *pbuf = buf;

  832.                 int buf_size;

  833. 

  834.                 avio_skip(pb, 8);

  835.                 consumed += 8;

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

  837.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  838.                     avio_skip(pb, 6);

  839.                     consumed += 6;

  840.                 }

  841. 

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

  843.                 avio_read(pb, buf, buf_size);

  844.                 consumed += buf_size;

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

  846.             }

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

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

  849.             if (stream_index >= 0) {

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

  851.                 int audio_type;

  852.                 avio_skip(pb, 8);

  853.                 audio_type = avio_r8(pb);

  854.                 if (audio_type == 2)

  855.                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

  856.                 else if (audio_type == 3)

  857.                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  858.                 consumed += 9;

  859.             }

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

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

  862.             if (stream_index >= 0) {

  863.                 avio_skip(pb, 12);

  864.                 if (avio_rl32(pb))

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

  866.                 consumed += 16;

  867.             }

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

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

  870.             if (stream_index >= 0) {

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

  872.                 uint8_t language[4];

  873.                 avio_skip(pb, 12);

  874.                 avio_read(pb, language, 3);

  875.                 if (language[0]) {

  876.                     language[3] = 0;

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

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

  879.                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

  880.                 }

  881.                 consumed += 15;

  882.             }

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

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

  885.             if (stream_index >= 0) {

  886.                 avio_skip(pb, 8);

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

  888.                 consumed += 16;

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

  890.                     wtv->pts = AV_NOPTS_VALUE;

  891.                 else {

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

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

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

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

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

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

  898.                     return 0;

  899.                 }

  900.                 }

  901.             }

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

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

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

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

  906.                 wst->seen_data = 1;

  907.                 if (len_ptr) {

  908.                     *len_ptr = len;

  909.                 }

  910.                 return stream_index;

  911.             }

  912.         } else if (

  913.             !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}) ||

  914.             !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}) ||

  915.             !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}) ||

  916.             !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}) ||

  917.             !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}) ||

  918.             !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}) ||

  919.             !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}) ||

  920.             !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}) ||

  921.             !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}) ||

  922.             !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}) ||

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

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

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

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

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

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

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

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

  931.             //ignore known guids

  932.         } else

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

  934. 

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

  936.     }

  937.     return AVERROR_EOF;

  938. }

  939. 

  940. /* declare utf16le strings */

  941. #define _ , 0,

  942. static const uint8_t timeline_le16[] =

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

  944. static const uint8_t table_0_entries_legacy_attrib_le16[] =

  945.     {'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};

  946. static const uint8_t table_0_entries_time_le16[] =

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

  948. static const uint8_t timeline_table_0_entries_Events_le16[] =

  949.     {'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};

  950. #undef _

  951. 

  952. static int read_header(AVFormatContext *s)

  953. {

  954.     WtvContext *wtv = s->priv_data;

  955.     int root_sector, root_size;

  956.     uint8_t root[WTV_SECTOR_SIZE];

  957.     AVIOContext *pb;

  958.     int64_t timeline_pos;

  959.     int ret;

  960. 

  961.     wtv->epoch          =

  962.     wtv->pts            =

  963.     wtv->last_valid_pts = AV_NOPTS_VALUE;

  964. 

  965.     /* read root directory sector */

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

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

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

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

  970.         return AVERROR_INVALIDDATA;

  971.     }

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

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

  974. 

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

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

  977.     if (root_size < 0)

  978.         return AVERROR_INVALIDDATA;

  979. 

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

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

  982.     if (!wtv->pb) {

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

  984.         return AVERROR_INVALIDDATA;

  985.     }

  986. 

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

  988.     if (ret < 0)

  989.         return ret;

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

  991. 

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

  993. 

  994.     /* read metadata */

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

  996.     if (pb) {

  997.         parse_legacy_attrib(s, pb);

  998.         wtvfile_close(pb);

  999.     }

  1000. 

  1001.     /* read seek index */

  1002.     if (s->nb_streams) {

  1003.         AVStream *st = s->streams[0];

  1004.         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);

  1005.         if (pb) {

  1006.             while(1) {

  1007.                 uint64_t timestamp = avio_rl64(pb);

  1008.                 uint64_t frame_nb  = avio_rl64(pb);

  1009.                 if (pb->eof_reached)

  1010.                     break;

  1011.                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,

  1012.                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

  1013.             }

  1014.             wtvfile_close(pb);

  1015. 

  1016.             if (wtv->nb_index_entries) {

  1017.                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);

  1018.                 if (pb) {

  1019.                     int i;

  1020.                     while (1) {

  1021.                         uint64_t frame_nb = avio_rl64(pb);

  1022.                         uint64_t position = avio_rl64(pb);

  1023.                         if (pb->eof_reached)

  1024.                             break;

  1025.                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {

  1026.                             AVIndexEntry *e = wtv->index_entries + i;

  1027.                             if (frame_nb > e->size)

  1028.                                 break;

  1029.                             if (position > e->pos)

  1030.                                 e->pos = position;

  1031.                         }

  1032.                     }

  1033.                     wtvfile_close(pb);

  1034.                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;

  1035.                 }

  1036.             }

  1037.         }

  1038.     }

  1039. 

  1040.     avio_seek(s->pb, timeline_pos, SEEK_SET);

  1041.     return 0;

  1042. }

  1043. 

  1044. static int read_packet(AVFormatContext *s, AVPacket *pkt)

  1045. {

  1046.     WtvContext *wtv = s->priv_data;

  1047.     AVIOContext *pb = wtv->pb;

  1048.     int stream_index, len, ret;

  1049. 

  1050.     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);

  1051.     if (stream_index < 0)

  1052.         return stream_index;

  1053. 

  1054.     ret = av_get_packet(pb, pkt, len - 32);

  1055.     if (ret < 0)

  1056.         return ret;

  1057.     pkt->stream_index = stream_index;

  1058.     pkt->pts          = wtv->pts;

  1059.     avio_skip(pb, WTV_PAD8(len) - len);

  1060.     return 0;

  1061. }

  1062. 

  1063. static int read_seek(AVFormatContext *s, int stream_index,

  1064.                      int64_t ts, int flags)

  1065. {

  1066.     WtvContext *wtv = s->priv_data;

  1067.     AVIOContext *pb = wtv->pb;

  1068.     AVStream *st = s->streams[0];

  1069.     int64_t ts_relative;

  1070.     int i;

  1071. 

  1072.     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

  1073.         return AVERROR(ENOSYS);

  1074. 

  1075.     /* timestamp adjustment is required because wtv->pts values are absolute,

  1076.      * whereas AVIndexEntry->timestamp values are relative to epoch. */

  1077.     ts_relative = ts;

  1078.     if (wtv->epoch != AV_NOPTS_VALUE)

  1079.         ts_relative -= wtv->epoch;

  1080. 

  1081.     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

  1082.     if (i < 0) {

  1083.         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

  1084.             avio_seek(pb, 0, SEEK_SET);

  1085.         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

  1086.             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

  1087.         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)

  1088.             return AVERROR(ERANGE);

  1089.         return 0;

  1090.     }

  1091.     wtv->pts = wtv->index_entries[i].timestamp;

  1092.     if (wtv->epoch != AV_NOPTS_VALUE)

  1093.         wtv->pts += wtv->epoch;

  1094.     wtv->last_valid_pts = wtv->pts;

  1095.     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);

  1096.     return 0;

  1097. }

  1098. 

  1099. static int read_close(AVFormatContext *s)

  1100. {

  1101.     WtvContext *wtv = s->priv_data;

  1102.     av_free(wtv->index_entries);

  1103.     wtvfile_close(wtv->pb);

  1104.     return 0;

  1105. }

  1106. 

  1107. AVInputFormat ff_wtv_demuxer = {

  1108.     .name           = "wtv",

  1109.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),

  1110.     .priv_data_size = sizeof(WtvContext),

  1111.     .read_probe     = read_probe,

  1112.     .read_header    = read_header,

  1113.     .read_packet    = read_packet,

  1114.     .read_seek      = read_seek,

  1115.     .read_close     = read_close,

  1116.     .flags          = AVFMT_SHOW_IDS,

  1117. };