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FFmpeg/libavformat/wtv.c

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  1. /*

  2.  * Windows Television (WTV) demuxer

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * Windows Television (WTV) demuxer

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

  26.  */

  27. 

  28. #include "libavutil/intreadwrite.h"

  29. #include "avformat.h"

  30. #include "riff.h"

  31. #include "asf.h"

  32. #include "mpegts.h"

  33. 

  34. /* Macros for formating GUIDs */

  35. #define PRI_GUID \

  36.     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"

  37. #define ARG_GUID(g) \

  38.     g[0],g[1],g[2],g[3],g[4],g[5],g[6],g[7],g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]

  39. 

  40. typedef struct WtvContext {

  41.     uint64_t pts;

  42. } WtvContext;

  43. 

  44. static int is_zero(uint8_t *v, int n)

  45. {

  46.    int i;

  47.    for (i = 0; i < n; i++)

  48.       if (v[i]) return 0;

  49.    return 1;

  50. }

  51. 

  52. typedef struct {

  53.     enum CodecID id;

  54.     ff_asf_guid guid;

  55. } AVCodecGuid;

  56. 

  57. static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)

  58. {

  59.     int i;

  60.     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {

  61.         if (!ff_guidcmp(guids[i].guid, guid))

  62.             return guids[i].id;

  63.     }

  64.     return CODEC_ID_NONE;

  65. }

  66. 

  67. /* WTV GUIDs */

  68. static const ff_asf_guid wtv_guid =

  69.     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  70. static const ff_asf_guid meta_guid =

  71.     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};

  72. static const ff_asf_guid timestamp_guid =

  73.     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};

  74. static const ff_asf_guid data_guid =

  75.     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

  76. static const ff_asf_guid stream_guid =

  77.     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};

  78. static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

  79.     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};

  80. static const ff_asf_guid EVENTID_LanguageSpanningEvent =

  81.     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};

  82. static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

  83.     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};

  84. static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

  85.     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};

  86. static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

  87.     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};

  88. static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

  89.     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};

  90. static const ff_asf_guid EVENTID_TeletextSpanningEvent =

  91.     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};

  92. 

  93. /* Windows media GUIDs */

  94. 

  95. #define MEDIASUBTYPE_BASE_GUID \

  96.     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71

  97. 

  98. /* Media types */

  99. static const ff_asf_guid mediatype_audio =

  100.     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};

  101. static const ff_asf_guid mediatype_video =

  102.     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};

  103. static const ff_asf_guid mediasubtype_mpeg1payload =

  104.     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};

  105. static const ff_asf_guid mediatype_mpeg2_sections =

  106.     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};

  107. static const ff_asf_guid mediatype_mpeg2_pes =

  108.     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  109. static const ff_asf_guid mediatype_mstvcaption =

  110.     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};

  111. 

  112. /* Media subtypes */

  113. static const ff_asf_guid mediasubtype_cpfilters_processed =

  114.     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};

  115. static const ff_asf_guid mediasubtype_dvb_subtitle =

  116.     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};

  117. static const ff_asf_guid mediasubtype_teletext =

  118.     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  119. static const ff_asf_guid mediasubtype_dtvccdata =

  120.     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};

  121. static const ff_asf_guid mediasubtype_mpeg2_sections =

  122.     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};

  123. 

  124. /* Formats */

  125. static const ff_asf_guid format_cpfilters_processed =

  126.     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};

  127. static const ff_asf_guid format_waveformatex =

  128.     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};

  129. static const ff_asf_guid format_videoinfo2 =

  130.     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};

  131. static const ff_asf_guid format_mpeg2_video =

  132.     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};

  133. static const ff_asf_guid format_none =

  134.     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};

  135. 

  136. static const AVCodecGuid video_guids[] = {

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

  138.     {CODEC_ID_NONE}

  139. };

  140. 

  141. static const AVCodecGuid audio_guids[] = {

  142.     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},

  143.     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},

  144.     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},

  145.     {CODEC_ID_NONE}

  146. };

  147. 

  148. static int read_probe(AVProbeData *p)

  149. {

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

  151. }

  152. 

  153. /**

  154.  * parse VIDEOINFOHEADER2 structure

  155.  * @return bytes consumed

  156.  */

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

  158. {

  159.     ByteIOContext *pb = s->pb;

  160. 

  161.     url_fskip(pb, 32);

  162.     st->codec->bit_rate = get_le32(pb);

  163.     url_fskip(pb, 20);

  164.     st->sample_aspect_ratio.num = get_le32(pb);

  165.     st->sample_aspect_ratio.den = get_le32(pb);

  166.     url_fskip(pb, 8);

  167.     ff_get_bmp_header(pb, st);

  168. 

  169.     return 72 + 40;

  170. }

  171. 

  172. /**

  173.  * Parse MPEG1WAVEFORMATEX extradata structure

  174.  */

  175. static void parse_mpeg1waveformatex(AVStream *st)

  176. {

  177.     /* fwHeadLayer */

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

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

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

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

  182.     }

  183. 

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

  185. 

  186.     /* dwHeadMode */

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

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

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

  190.     }

  191. }

  192. 

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

  194. {

  195.     AVStream * st = av_new_stream(s, sid);

  196.     if (!st)

  197.         return NULL;

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

  199.     st->need_parsing      = AVSTREAM_PARSE_FULL;

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

  201.     return st;

  202. }

  203. 

  204. /**

  205.  * parse Media Type structure and create new streams as required

  206.  * @param mediatype  Mediatype GUID

  207.  * @param subtype    Subtype GUID

  208.  * @param formattype Format GUID

  209.  * @param size       Size of format buffer

  210.  * @return NULL on error

  211.  */

  212. static AVStream * parse_media_type(AVFormatContext *s, int sid,

  213.                                    ff_asf_guid mediatype, ff_asf_guid subtype,

  214.                                    ff_asf_guid formattype, int size)

  215. {

  216.     ByteIOContext *pb = s->pb;

  217.     AVStream *st;

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

  219.         !ff_guidcmp(formattype, format_cpfilters_processed)) {

  220.         ff_asf_guid actual_subtype;

  221.         ff_asf_guid actual_formattype;

  222. 

  223.         if (size < 32) {

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

  225.             url_fskip(pb, size);

  226.             return NULL;

  227.         }

  228. 

  229.         url_fskip(pb, size - 32);

  230.         ff_get_guid(pb, &actual_subtype);

  231.         ff_get_guid(pb, &actual_formattype);

  232.         url_fseek(pb, -size, SEEK_CUR);

  233. 

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

  235.         url_fskip(pb, 32);

  236.         return st;

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

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

  239.         if (!st)

  240.             return NULL;

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

  242.             ff_get_wav_header(pb, st->codec, size);

  243.         } else {

  244.             if (ff_guidcmp(formattype, format_none))

  245.                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  246.             url_fskip(pb, size);

  247.         }

  248. 

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

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

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

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

  253.                 parse_mpeg1waveformatex(st);

  254.             else

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

  256.         } else {

  257.             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);

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

  259.                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));

  260.         }

  261.         return st;

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

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

  264.         if (!st)

  265.             return NULL;

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

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

  268.             url_fskip(pb, FFMAX(size - consumed, 0));

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

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

  271.             url_fskip(pb, FFMAX(size - consumed, 0));

  272.         } else {

  273.             if (ff_guidcmp(formattype, format_none))

  274.                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  275.             url_fskip(pb, size);

  276.         }

  277. 

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

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

  280.         } else {

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

  282.         }

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

  284.             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));

  285.         return st;

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

  287.                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

  289.         if (!st)

  290.             return NULL;

  291.         if (ff_guidcmp(formattype, format_none))

  292.             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  293.         url_fskip(pb, size);

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

  295.         return st;

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

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

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

  299.         if (!st)

  300.             return NULL;

  301.         if (ff_guidcmp(formattype, format_none))

  302.             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  303.         url_fskip(pb, size);

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

  305.         return st;

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

  307.                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

  308.         if (ff_guidcmp(formattype, format_none))

  309.             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));

  310.         url_fskip(pb, size);

  311.         return NULL;

  312.     }

  313. 

  314.     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID

  315.                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",

  316.                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));

  317.     url_fskip(pb, size);

  318.     return NULL;

  319. }

  320. 

  321. enum {

  322.     SEEK_TO_DATA = 0,

  323.     SEEK_TO_BYTE,

  324.     SEEK_TO_PTS,

  325. };

  326. 

  327. /**

  328.  * Parse WTV chunks

  329.  * @param mode SEEK_TO_DATA, SEEK_TO_BYTE, SEEK_TO_PTS

  330.  * @param seekts either byte position or timestamp

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

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

  333.  */

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

  335. {

  336.     WtvContext *wtv = s->priv_data;

  337.     ByteIOContext *pb = s->pb;

  338.     while (!url_feof(pb)) {

  339.         ff_asf_guid g;

  340.         int len, sid, consumed;

  341. 

  342.         if (mode == SEEK_TO_BYTE && url_ftell(pb) >= seekts)

  343.             return 0;

  344. 

  345.         ff_get_guid(pb, &g);

  346.         if (is_zero(g, sizeof(ff_asf_guid)))

  347.             return AVERROR_EOF;

  348. 

  349.         len = get_le32(pb);

  350.         sid = get_le32(pb) & 0x7FFF;

  351.         url_fskip(pb, 8);

  352.         consumed = 32;

  353. 

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

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

  356.                 ff_asf_guid mediatype, subtype, formattype;

  357.                 int size;

  358.                 consumed += 20;

  359.                 url_fskip(pb, 16);

  360.                 if (get_le32(pb)) {

  361.                     url_fskip(pb, 8);

  362.                     ff_get_guid(pb, &mediatype);

  363.                     ff_get_guid(pb, &subtype);

  364.                     url_fskip(pb, 12);

  365.                     ff_get_guid(pb, &formattype);

  366.                     size = get_le32(pb);

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

  368.                     consumed += 72 + size;

  369.                 }

  370.             }

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

  372.                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

  373.                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

  374.                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

  375.                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

  376.                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

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

  378.             if (stream_index >= 0) {

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

  380.                 uint8_t buf[258];

  381.                 const uint8_t *pbuf = buf;

  382.                 int buf_size;

  383. 

  384.                 url_fskip(pb, 8);

  385.                 consumed += 8;

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

  387.                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

  388.                     url_fskip(pb, 6);

  389.                     consumed += 6;

  390.                 }

  391. 

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

  393.                 get_buffer(pb, buf, buf_size);

  394.                 consumed += buf_size;

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

  396.             }

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

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

  399.             if (stream_index >= 0) {

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

  401.                 uint8_t language[4];

  402.                 url_fskip(pb, 12);

  403.                 get_buffer(pb, language, 3);

  404.                 if (language[0]) {

  405.                     language[3] = 0;

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

  407.                 }

  408.                 consumed += 15;

  409.             }

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

  411.             url_fskip(pb, 8);

  412.             wtv->pts = get_le64(pb);

  413.             consumed += 16;

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

  415.                 wtv->pts = AV_NOPTS_VALUE;

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

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

  418.                 url_fskip(pb, WTV_PAD8(len) - consumed);

  419.                 return 0;

  420.             }

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

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

  423.             if (mode == SEEK_TO_DATA && stream_index >= 0) {

  424.                 if (len_ptr) {

  425.                     *len_ptr = len;

  426.                 }

  427.                 if (wtv->pts != AV_NOPTS_VALUE)

  428.                     av_add_index_entry(s->streams[stream_index], url_ftell(pb) - consumed, wtv->pts, 0, 0, AVINDEX_KEYFRAME);

  429.                 return stream_index;

  430.             }

  431.         } else if (

  432.             !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}) ||

  433.             !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}) ||

  434.             !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}) ||

  435.             !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}) ||

  436.             !ff_guidcmp(g, /* EVENTID_AudioTypeSpanningEvent */ (const ff_asf_guid){0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3}) ||

  437.             !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}) ||

  438.             !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}) ||

  439.             !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}) ||

  440.             !ff_guidcmp(g, /* EVENTID_DVBScramblingControlSpanningEvent */ (const ff_asf_guid){0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B}) ||

  441.             !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}) ||

  442.             !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}) ||

  443.             !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}) ||

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

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

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

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

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

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

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

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

  452.             !ff_guidcmp(g, (const ff_asf_guid){0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {

  453.             //ignore known guids

  454.         } else

  455.             av_log(s, AV_LOG_WARNING, "unsuported chunk:"PRI_GUID"\n", ARG_GUID(g));

  456. 

  457.         url_fskip(pb, WTV_PAD8(len) - consumed);

  458.     }

  459.     return AVERROR_EOF;

  460. }

  461. 

  462. #define WTV_CHUNK_START 0x40000

  463. 

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

  465. {

  466.     ByteIOContext *pb = s->pb;

  467.     int ret;

  468. 

  469.     url_fseek(pb, WTV_CHUNK_START, SEEK_SET);

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

  471.     if (ret < 0)

  472.         return ret;

  473. 

  474.     url_fseek(pb, -32, SEEK_CUR);

  475.     return 0;

  476. }

  477. 

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

  479. {

  480.     WtvContext *wtv = s->priv_data;

  481.     ByteIOContext *pb = s->pb;

  482.     int stream_index, len, ret;

  483. 

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

  485.     if (stream_index < 0)

  486.         return stream_index;

  487. 

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

  489.     if (ret < 0)

  490.         return ret;

  491.     pkt->stream_index = stream_index;

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

  493.     url_fskip(pb, WTV_PAD8(len) - len);

  494.     return 0;

  495. }

  496. 

  497. static int read_seek2(AVFormatContext *s, int stream_index,

  498.                       int64_t min_ts, int64_t ts, int64_t max_ts, int flags)

  499. {

  500.     WtvContext *wtv = s->priv_data;

  501.     ByteIOContext *pb = s->pb;

  502.     AVStream *st;

  503.     int i;

  504. 

  505.     if (stream_index < 0) {

  506.         stream_index = av_find_default_stream_index(s);

  507.         if (stream_index < 0)

  508.             return -1;

  509.     }

  510.     st = s->streams[stream_index];

  511. 

  512.     if ((flags & AVSEEK_FLAG_FRAME)) {

  513.         return AVERROR_NOTSUPP;

  514.     } else if ((flags & AVSEEK_FLAG_BYTE)) {

  515.         if (ts < url_ftell(pb)) {

  516.             for (i = st->nb_index_entries - 1; i >= 0; i--) {

  517.                 if (st->index_entries[i].pos <= ts) {

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

  519.                     url_fseek(pb, st->index_entries[i].pos, SEEK_SET);

  520.                     break;

  521.                 }

  522.             }

  523.             if (i < 0) {

  524.                 wtv->pts = 0;

  525.                 url_fseek(pb, WTV_CHUNK_START, SEEK_SET);

  526.             }

  527.         }

  528.         if (parse_chunks(s, SEEK_TO_BYTE, ts, 0) < 0)

  529.             return AVERROR(ERANGE);

  530.         return 0;

  531.     } else {

  532.         ts *= 10;

  533.         i = av_index_search_timestamp(st, ts, flags);

  534.         if (i < 0) {

  535.             if (st->nb_index_entries > 0) {

  536.                 wtv->pts    = st->index_entries[st->nb_index_entries - 1].timestamp;

  537.                 url_fseek(pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET);

  538.             } else {

  539.                 wtv->pts = 0;

  540.                 url_fseek(pb, WTV_CHUNK_START, SEEK_SET);

  541.             }

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

  543.                 return AVERROR(ERANGE);

  544.             return 0;

  545.         }

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

  547.         url_fseek(pb, st->index_entries[i].pos, SEEK_SET);

  548.         return 0;

  549.     }

  550. }

  551. 

  552. AVInputFormat wtv_demuxer = {

  553.     .name           = "wtv",

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

  555.     .priv_data_size = sizeof(WtvContext),

  556.     .read_probe     = read_probe,

  557.     .read_header    = read_header,

  558.     .read_packet    = read_packet,

  559.     .read_seek2     = read_seek2,

  560.     .flags          = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,

  561. };