git.sesse.net Git - ffmpeg/blob - libavformat/wtv.c

   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_DVBScramblingControlSpanningEvent =
  89     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
  90 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
  91     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
  92 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
  93     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
  94
  95 /* Windows media GUIDs */
  96
  97 #define MEDIASUBTYPE_BASE_GUID \
  98     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
  99
 100 /* Media types */
 101 static const ff_asf_guid mediatype_audio =
 102     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
 103 static const ff_asf_guid mediatype_video =
 104     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
 105 static const ff_asf_guid mediasubtype_mpeg1payload =
 106     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
 107 static const ff_asf_guid mediatype_mpeg2_sections =
 108     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
 109 static const ff_asf_guid mediatype_mpeg2_pes =
 110     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 111 static const ff_asf_guid mediatype_mstvcaption =
 112     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
 113
 114 /* Media subtypes */
 115 static const ff_asf_guid mediasubtype_cpfilters_processed =
 116     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
 117 static const ff_asf_guid mediasubtype_dvb_subtitle =
 118     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
 119 static const ff_asf_guid mediasubtype_teletext =
 120     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 121 static const ff_asf_guid mediasubtype_dtvccdata =
 122     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
 123 static const ff_asf_guid mediasubtype_mpeg2_sections =
 124     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
 125
 126 /* Formats */
 127 static const ff_asf_guid format_cpfilters_processed =
 128     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
 129 static const ff_asf_guid format_waveformatex =
 130     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
 131 static const ff_asf_guid format_videoinfo2 =
 132     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 133 static const ff_asf_guid format_mpeg2_video =
 134     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
 135 static const ff_asf_guid format_none =
 136     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
 137
 138 static const AVCodecGuid video_guids[] = {
 139     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 140     {CODEC_ID_NONE}
 141 };
 142
 143 static const AVCodecGuid audio_guids[] = {
 144     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 145     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
 146     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
 147     {CODEC_ID_NONE}
 148 };
 149
 150 static int read_probe(AVProbeData *p)
 151 {
 152     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
 153 }
 154
 155 /**
 156  * parse VIDEOINFOHEADER2 structure
 157  * @return bytes consumed
 158  */
 159 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
 160 {
 161     ByteIOContext *pb = s->pb;
 162
 163     url_fskip(pb, 32);
 164     st->codec->bit_rate = get_le32(pb);
 165     url_fskip(pb, 20);
 166     st->sample_aspect_ratio.num = get_le32(pb);
 167     st->sample_aspect_ratio.den = get_le32(pb);
 168     url_fskip(pb, 8);
 169     ff_get_bmp_header(pb, st);
 170
 171     return 72 + 40;
 172 }
 173
 174 /**
 175  * Parse MPEG1WAVEFORMATEX extradata structure
 176  */
 177 static void parse_mpeg1waveformatex(AVStream *st)
 178 {
 179     /* fwHeadLayer */
 180     switch (AV_RL16(st->codec->extradata)) {
 181     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
 182     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
 183     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
 184     }
 185
 186     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
 187
 188     /* dwHeadMode */
 189     switch (AV_RL16(st->codec->extradata + 6)) {
 190     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
 191     case 8 :                   st->codec->channels = 1; break;
 192     }
 193 }
 194
 195 static AVStream * new_stream(AVFormatContext *s, int sid, int codec_type)
 196 {
 197     AVStream * st = av_new_stream(s, sid);
 198     if (!st)
 199         return NULL;
 200     st->codec->codec_type = codec_type;
 201     st->need_parsing      = AVSTREAM_PARSE_FULL;
 202     av_set_pts_info(st, 64, 1, 10000000);
 203     return st;
 204 }
 205
 206 /**
 207  * parse Media Type structure and create new streams as required
 208  * @param mediatype  Mediatype GUID
 209  * @param subtype    Subtype GUID
 210  * @param formattype Format GUID
 211  * @param size       Size of format buffer
 212  * @return NULL on error
 213  */
 214 static AVStream * parse_media_type(AVFormatContext *s, int sid,
 215                                    ff_asf_guid mediatype, ff_asf_guid subtype,
 216                                    ff_asf_guid formattype, int size)
 217 {
 218     ByteIOContext *pb = s->pb;
 219     AVStream *st;
 220     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
 221         !ff_guidcmp(formattype, format_cpfilters_processed)) {
 222         ff_asf_guid actual_subtype;
 223         ff_asf_guid actual_formattype;
 224
 225         if (size < 32) {
 226             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
 227             url_fskip(pb, size);
 228             return NULL;
 229         }
 230
 231         url_fskip(pb, size - 32);
 232         ff_get_guid(pb, &actual_subtype);
 233         ff_get_guid(pb, &actual_formattype);
 234         url_fseek(pb, -size, SEEK_CUR);
 235
 236         st = parse_media_type(s, sid, mediatype, actual_subtype, actual_formattype, size - 32);
 237         url_fskip(pb, 32);
 238         return st;
 239     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
 240         st = new_stream(s, sid, AVMEDIA_TYPE_AUDIO);
 241         if (!st)
 242             return NULL;
 243         if (!ff_guidcmp(formattype, format_waveformatex)) {
 244             ff_get_wav_header(pb, st->codec, size);
 245         } else {
 246             if (ff_guidcmp(formattype, format_none))
 247                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 248             url_fskip(pb, size);
 249         }
 250
 251         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
 252             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
 253         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
 254             if (st->codec->extradata && st->codec->extradata_size >= 22)
 255                 parse_mpeg1waveformatex(st);
 256             else
 257                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
 258         } else {
 259             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
 260             if (st->codec->codec_id == CODEC_ID_NONE)
 261                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
 262         }
 263         return st;
 264     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
 265         st = new_stream(s, sid, AVMEDIA_TYPE_VIDEO);
 266         if (!st)
 267             return NULL;
 268         if (!ff_guidcmp(formattype, format_videoinfo2)) {
 269             int consumed = parse_videoinfoheader2(s, st);
 270             url_fskip(pb, FFMAX(size - consumed, 0));
 271         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
 272             int consumed = parse_videoinfoheader2(s, st);
 273             url_fskip(pb, FFMAX(size - consumed, 0));
 274         } else {
 275             if (ff_guidcmp(formattype, format_none))
 276                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 277             url_fskip(pb, size);
 278         }
 279
 280         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
 281             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
 282         } else {
 283             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
 284         }
 285         if (st->codec->codec_id == CODEC_ID_NONE)
 286             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
 287         return st;
 288     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
 289                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
 290         st = new_stream(s, sid, AVMEDIA_TYPE_SUBTITLE);
 291         if (!st)
 292             return NULL;
 293         if (ff_guidcmp(formattype, format_none))
 294             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 295         url_fskip(pb, size);
 296         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
 297         return st;
 298     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
 299                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
 300         st = new_stream(s, sid, AVMEDIA_TYPE_SUBTITLE);
 301         if (!st)
 302             return NULL;
 303         if (ff_guidcmp(formattype, format_none))
 304             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 305         url_fskip(pb, size);
 306         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
 307         return st;
 308     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
 309                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
 310         if (ff_guidcmp(formattype, format_none))
 311             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
 312         url_fskip(pb, size);
 313         return NULL;
 314     }
 315
 316     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
 317                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
 318                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
 319     url_fskip(pb, size);
 320     return NULL;
 321 }
 322
 323 enum {
 324     SEEK_TO_DATA = 0,
 325     SEEK_TO_BYTE,
 326     SEEK_TO_PTS,
 327 };
 328
 329 /**
 330  * Parse WTV chunks
 331  * @param mode SEEK_TO_DATA, SEEK_TO_BYTE, SEEK_TO_PTS
 332  * @param seekts either byte position or timestamp
 333  * @param[out] len Length of data chunk
 334  * @return stream index of data chunk, or <0 on error
 335  */
 336 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
 337 {
 338     WtvContext *wtv = s->priv_data;
 339     ByteIOContext *pb = s->pb;
 340     while (!url_feof(pb)) {
 341         ff_asf_guid g;
 342         int len, sid, consumed;
 343
 344         if (mode == SEEK_TO_BYTE && url_ftell(pb) >= seekts)
 345             return 0;
 346
 347         ff_get_guid(pb, &g);
 348         if (is_zero(g, sizeof(ff_asf_guid)))
 349             return AVERROR_EOF;
 350
 351         len = get_le32(pb);
 352         sid = get_le32(pb) & 0x7FFF;
 353         url_fskip(pb, 8);
 354         consumed = 32;
 355
 356         if (!ff_guidcmp(g, stream_guid)) {
 357             if (ff_find_stream_index(s, sid) < 0) {
 358                 ff_asf_guid mediatype, subtype, formattype;
 359                 int size;
 360                 consumed += 20;
 361                 url_fskip(pb, 16);
 362                 if (get_le32(pb)) {
 363                     url_fskip(pb, 8);
 364                     ff_get_guid(pb, &mediatype);
 365                     ff_get_guid(pb, &subtype);
 366                     url_fskip(pb, 12);
 367                     ff_get_guid(pb, &formattype);
 368                     size = get_le32(pb);
 369                     parse_media_type(s, sid, mediatype, subtype, formattype, size);
 370                     consumed += 72 + size;
 371                 }
 372             }
 373         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
 374                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 375                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
 376                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
 377                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
 378                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
 379             int stream_index = ff_find_stream_index(s, sid);
 380             if (stream_index >= 0) {
 381                 AVStream *st = s->streams[stream_index];
 382                 uint8_t buf[258];
 383                 const uint8_t *pbuf = buf;
 384                 int buf_size;
 385
 386                 url_fskip(pb, 8);
 387                 consumed += 8;
 388                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
 389                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
 390                     url_fskip(pb, 6);
 391                     consumed += 6;
 392                 }
 393
 394                 buf_size = FFMIN(len - consumed, sizeof(buf));
 395                 get_buffer(pb, buf, buf_size);
 396                 consumed += buf_size;
 397                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
 398             }
 399         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
 400             int stream_index = ff_find_stream_index(s, sid);
 401             if (stream_index >= 0) {
 402                 url_fskip(pb, 12);
 403                 if (get_le32(pb))
 404                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
 405                 consumed += 16;
 406             }
 407         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
 408             int stream_index = ff_find_stream_index(s, sid);
 409             if (stream_index >= 0) {
 410                 AVStream *st = s->streams[stream_index];
 411                 uint8_t language[4];
 412                 url_fskip(pb, 12);
 413                 get_buffer(pb, language, 3);
 414                 if (language[0]) {
 415                     language[3] = 0;
 416                     av_metadata_set2(&st->metadata, "language", language, 0);
 417                 }
 418                 consumed += 15;
 419             }
 420         } else if (!ff_guidcmp(g, timestamp_guid)) {
 421             url_fskip(pb, 8);
 422             wtv->pts = get_le64(pb);
 423             consumed += 16;
 424             if (wtv->pts == -1)
 425                 wtv->pts = AV_NOPTS_VALUE;
 426             if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
 427 #define WTV_PAD8(x) (((x) + 7) & ~7)
 428                 url_fskip(pb, WTV_PAD8(len) - consumed);
 429                 return 0;
 430             }
 431         } else if (!ff_guidcmp(g, data_guid)) {
 432             int stream_index = ff_find_stream_index(s, sid);
 433             if (mode == SEEK_TO_DATA && stream_index >= 0) {
 434                 if (len_ptr) {
 435                     *len_ptr = len;
 436                 }
 437                 if (wtv->pts != AV_NOPTS_VALUE)
 438                     av_add_index_entry(s->streams[stream_index], url_ftell(pb) - consumed, wtv->pts, 0, 0, AVINDEX_KEYFRAME);
 439                 return stream_index;
 440             }
 441         } else if (
 442             !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}) ||
 443             !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}) ||
 444             !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}) ||
 445             !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}) ||
 446             !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}) ||
 447             !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}) ||
 448             !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}) ||
 449             !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}) ||
 450             !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}) ||
 451             !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}) ||
 452             !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}) ||
 453             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
 454             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
 455             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
 456             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 457             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
 458             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 459             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 460             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
 461             !ff_guidcmp(g, (const ff_asf_guid){0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
 462             //ignore known guids
 463         } else
 464             av_log(s, AV_LOG_WARNING, "unsuported chunk:"PRI_GUID"\n", ARG_GUID(g));
 465
 466         url_fskip(pb, WTV_PAD8(len) - consumed);
 467     }
 468     return AVERROR_EOF;
 469 }
 470
 471 #define WTV_CHUNK_START 0x40000
 472
 473 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
 474 {
 475     ByteIOContext *pb = s->pb;
 476     int ret;
 477
 478     url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
 479     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
 480     if (ret < 0)
 481         return ret;
 482
 483     url_fseek(pb, -32, SEEK_CUR);
 484     return 0;
 485 }
 486
 487 static int read_packet(AVFormatContext *s, AVPacket *pkt)
 488 {
 489     WtvContext *wtv = s->priv_data;
 490     ByteIOContext *pb = s->pb;
 491     int stream_index, len, ret;
 492
 493     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
 494     if (stream_index < 0)
 495         return stream_index;
 496
 497     ret = av_get_packet(pb, pkt, len - 32);
 498     if (ret < 0)
 499         return ret;
 500     pkt->stream_index = stream_index;
 501     pkt->pts          = wtv->pts;
 502     url_fskip(pb, WTV_PAD8(len) - len);
 503     return 0;
 504 }
 505
 506 static int read_seek2(AVFormatContext *s, int stream_index,
 507                       int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
 508 {
 509     WtvContext *wtv = s->priv_data;
 510     ByteIOContext *pb = s->pb;
 511     AVStream *st;
 512     int i;
 513
 514     if (stream_index < 0) {
 515         stream_index = av_find_default_stream_index(s);
 516         if (stream_index < 0)
 517             return -1;
 518     }
 519     st = s->streams[stream_index];
 520
 521     if ((flags & AVSEEK_FLAG_FRAME)) {
 522         return AVERROR_NOTSUPP;
 523     } else if ((flags & AVSEEK_FLAG_BYTE)) {
 524         if (ts < url_ftell(pb)) {
 525             for (i = st->nb_index_entries - 1; i >= 0; i--) {
 526                 if (st->index_entries[i].pos <= ts) {
 527                     wtv->pts    = st->index_entries[i].timestamp;
 528                     url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
 529                     break;
 530                 }
 531             }
 532             if (i < 0) {
 533                 wtv->pts = 0;
 534                 url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
 535             }
 536         }
 537         if (parse_chunks(s, SEEK_TO_BYTE, ts, 0) < 0)
 538             return AVERROR(ERANGE);
 539         return 0;
 540     } else {
 541         ts *= 10;
 542         i = av_index_search_timestamp(st, ts, flags);
 543         if (i < 0) {
 544             if (st->nb_index_entries > 0) {
 545                 wtv->pts    = st->index_entries[st->nb_index_entries - 1].timestamp;
 546                 url_fseek(pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET);
 547             } else {
 548                 wtv->pts = 0;
 549                 url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
 550             }
 551             if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
 552                 return AVERROR(ERANGE);
 553             return 0;
 554         }
 555         wtv->pts    = st->index_entries[i].timestamp;
 556         url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
 557         return 0;
 558     }
 559 }
 560
 561 AVInputFormat wtv_demuxer = {
 562     .name           = "wtv",
 563     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
 564     .priv_data_size = sizeof(WtvContext),
 565     .read_probe     = read_probe,
 566     .read_header    = read_header,
 567     .read_packet    = read_packet,
 568     .read_seek2     = read_seek2,
 569     .flags          = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
 570 };