libavformat/wtv.c
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00001 /*
00002  * Windows Television (WTV) demuxer
00003  * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 #include "libavutil/intreadwrite.h"
00029 #include "libavutil/intfloat.h"
00030 #include "libavutil/dict.h"
00031 #include "avformat.h"
00032 #include "internal.h"
00033 #include "riff.h"
00034 #include "asf.h"
00035 #include "mpegts.h"
00036 
00037 /* Macros for formating GUIDs */
00038 #define PRI_GUID \
00039     "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
00040 #define ARG_GUID(g) \
00041     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]
00042 
00043 #define PRI_PRETTY_GUID \
00044     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
00045 #define ARG_PRETTY_GUID(g) \
00046     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]
00047 #define LEN_PRETTY_GUID 34
00048 
00049 /*
00050  *
00051  * File system routines
00052  *
00053  */
00054 
00055 #define WTV_SECTOR_BITS    12
00056 #define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
00057 #define WTV_BIGSECTOR_BITS 18
00058 
00059 typedef struct {
00060     AVIOContext *pb_filesystem;  
00062     int sector_bits;     
00063     uint32_t *sectors;   
00064     int nb_sectors;      
00066     int error;
00067     int64_t position;
00068     int64_t length;
00069 } WtvFile;
00070 
00074 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
00075 {
00076     WtvFile *wf = opaque;
00077     AVIOContext *pb = wf->pb_filesystem;
00078     int nread = 0;
00079 
00080     if (wf->error || pb->error)
00081         return -1;
00082     if (wf->position >= wf->length || pb->eof_reached)
00083         return 0;
00084 
00085     buf_size = FFMIN(buf_size, wf->length - wf->position);
00086     while(nread < buf_size) {
00087         int n;
00088         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
00089         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
00090 
00091         n = avio_read(pb, buf, read_request);
00092         if (n <= 0)
00093             break;
00094         nread += n;
00095         buf += n;
00096         wf->position += n;
00097         if (n == remaining_in_sector) {
00098             int i = wf->position >> wf->sector_bits;
00099             if (i >= wf->nb_sectors ||
00100                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
00101                 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
00102                 wf->error = 1;
00103                 break;
00104             }
00105         }
00106     }
00107     return nread;
00108 }
00109 
00113 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
00114 {
00115     WtvFile *wf = opaque;
00116     AVIOContext *pb = wf->pb_filesystem;
00117 
00118     if (whence == AVSEEK_SIZE)
00119         return wf->length;
00120     else if (whence == SEEK_CUR)
00121         offset = wf->position + offset;
00122     else if (whence == SEEK_END)
00123         offset = wf->length;
00124 
00125     wf->error = offset < 0 || offset >= wf->length ||
00126                 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
00127                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
00128     wf->position = offset;
00129     return offset;
00130 }
00131 
00139 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
00140 {
00141     int i, total = 0;
00142     for (i = 0; i < count; i++) {
00143         if ((data[total] = avio_rl32(pb)))
00144            total++;
00145     }
00146     return total;
00147 }
00148 
00156 static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
00157 {
00158     AVIOContext *pb;
00159     WtvFile *wf;
00160     uint8_t *buffer;
00161 
00162     if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
00163         return NULL;
00164 
00165     wf = av_mallocz(sizeof(WtvFile));
00166     if (!wf)
00167         return NULL;
00168 
00169     if (depth == 0) {
00170         wf->sectors = av_malloc(sizeof(uint32_t));
00171         if (!wf->sectors) {
00172             av_free(wf);
00173             return NULL;
00174         }
00175         wf->sectors[0]  = first_sector;
00176         wf->nb_sectors  = 1;
00177         wf->sector_bits = WTV_SECTOR_BITS;
00178     } else if (depth == 1) {
00179         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
00180         if (!wf->sectors) {
00181             av_free(wf);
00182             return NULL;
00183         }
00184         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
00185         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
00186     } else if (depth == 2) {
00187         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
00188         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
00189         int i;
00190 
00191         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
00192         if (!wf->sectors) {
00193             av_free(wf);
00194             return NULL;
00195         }
00196         wf->nb_sectors = 0;
00197         for (i = 0; i < nb_sectors1; i++) {
00198             if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
00199                 break;
00200             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
00201         }
00202         wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
00203     } else {
00204         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
00205         av_free(wf);
00206         return NULL;
00207     }
00208 
00209     if (!wf->nb_sectors) {
00210         av_free(wf->sectors);
00211         av_free(wf);
00212         return NULL;
00213     }
00214 
00215     /* check length */
00216     length &= 0xFFFFFFFFFFFF;
00217     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
00218         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);
00219         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
00220     }
00221     wf->length = length;
00222 
00223     /* seek to intial sector */
00224     wf->position = 0;
00225     if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
00226         av_free(wf->sectors);
00227         av_free(wf);
00228         return NULL;
00229     }
00230 
00231     wf->pb_filesystem = s->pb;
00232     buffer = av_malloc(1 << wf->sector_bits);
00233     if (!buffer) {
00234         av_free(wf->sectors);
00235         av_free(wf);
00236         return NULL;
00237     }
00238 
00239     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
00240                            wtvfile_read_packet, NULL, wtvfile_seek);
00241     if (!pb) {
00242         av_free(buffer);
00243         av_free(wf->sectors);
00244         av_free(wf);
00245     }
00246     return pb;
00247 }
00248 
00249 static const ff_asf_guid dir_entry_guid =
00250     {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
00251 
00260 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
00261 {
00262     const uint8_t *buf_end = buf + buf_size;
00263 
00264     while(buf + 48 <= buf_end) {
00265         int dir_length, name_size, first_sector, depth;
00266         uint64_t file_length;
00267         const uint8_t *name;
00268         if (ff_guidcmp(buf, dir_entry_guid)) {
00269             av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
00270                    "remaining directory entries ignored\n", ARG_GUID(buf));
00271             break;
00272         }
00273         dir_length  = AV_RL16(buf + 16);
00274         file_length = AV_RL64(buf + 24);
00275         name_size   = 2 * AV_RL32(buf + 32);
00276         if (buf + 48 + name_size > buf_end) {
00277             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
00278             break;
00279         }
00280         first_sector = AV_RL32(buf + 40 + name_size);
00281         depth        = AV_RL32(buf + 44 + name_size);
00282 
00283         /* compare file name; test optional null terminator */
00284         name = buf + 40;
00285         if (name_size >= filename_size &&
00286             !memcmp(name, filename, filename_size) &&
00287             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
00288             return wtvfile_open_sector(first_sector, file_length, depth, s);
00289 
00290         buf += dir_length;
00291     }
00292     return 0;
00293 }
00294 
00295 #define wtvfile_open(s, buf, buf_size, filename) \
00296     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
00297 
00301 static void wtvfile_close(AVIOContext *pb)
00302 {
00303     WtvFile *wf = pb->opaque;
00304     av_free(wf->sectors);
00305     av_free(wf);
00306     av_free(pb->buffer);
00307     av_free(pb);
00308 }
00309 
00310 /*
00311  *
00312  * Main demuxer
00313  *
00314  */
00315 
00316 typedef struct {
00317     int seen_data;
00318 } WtvStream;
00319 
00320 typedef struct {
00321     AVIOContext *pb;       
00322     int64_t epoch;
00323     int64_t pts;             
00324     int64_t last_valid_pts;  
00326     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
00327        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
00328     AVIndexEntry *index_entries;
00329     int nb_index_entries;
00330     unsigned int index_entries_allocated_size;
00331 } WtvContext;
00332 
00333 typedef struct {
00334     enum CodecID id;
00335     ff_asf_guid guid;
00336 } AVCodecGuid;
00337 
00338 static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
00339 {
00340     int i;
00341     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
00342         if (!ff_guidcmp(guids[i].guid, guid))
00343             return guids[i].id;
00344     }
00345     return CODEC_ID_NONE;
00346 }
00347 
00348 /* WTV GUIDs */
00349 static const ff_asf_guid wtv_guid =
00350     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
00351 static const ff_asf_guid metadata_guid =
00352     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
00353 static const ff_asf_guid timestamp_guid =
00354     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
00355 static const ff_asf_guid data_guid =
00356     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
00357 static const ff_asf_guid stream_guid =
00358     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
00359 static const ff_asf_guid stream2_guid =
00360     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
00361 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
00362     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
00363 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
00364     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
00365 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
00366     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
00367 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
00368     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
00369 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
00370     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
00371 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
00372     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
00373 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
00374     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
00375 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
00376     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
00377 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
00378     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
00379 
00380 /* Windows media GUIDs */
00381 
00382 #define MEDIASUBTYPE_BASE_GUID \
00383     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
00384 
00385 /* Media types */
00386 static const ff_asf_guid mediatype_audio =
00387     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
00388 static const ff_asf_guid mediatype_video =
00389     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
00390 static const ff_asf_guid mediasubtype_mpeg1payload =
00391     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
00392 static const ff_asf_guid mediatype_mpeg2_sections =
00393     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
00394 static const ff_asf_guid mediatype_mpeg2_pes =
00395     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
00396 static const ff_asf_guid mediatype_mstvcaption =
00397     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
00398 
00399 /* Media subtypes */
00400 static const ff_asf_guid mediasubtype_cpfilters_processed =
00401     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
00402 static const ff_asf_guid mediasubtype_dvb_subtitle =
00403     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
00404 static const ff_asf_guid mediasubtype_teletext =
00405     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
00406 static const ff_asf_guid mediasubtype_dtvccdata =
00407     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
00408 static const ff_asf_guid mediasubtype_mpeg2_sections =
00409     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
00410 
00411 /* Formats */
00412 static const ff_asf_guid format_cpfilters_processed =
00413     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
00414 static const ff_asf_guid format_waveformatex =
00415     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
00416 static const ff_asf_guid format_videoinfo2 =
00417     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
00418 static const ff_asf_guid format_mpeg2_video =
00419     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
00420 static const ff_asf_guid format_none =
00421     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
00422 
00423 static const AVCodecGuid video_guids[] = {
00424     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00425     {CODEC_ID_NONE}
00426 };
00427 
00428 static const AVCodecGuid audio_guids[] = {
00429     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00430     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
00431     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00432     {CODEC_ID_NONE}
00433 };
00434 
00435 static int read_probe(AVProbeData *p)
00436 {
00437     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
00438 }
00439 
00443 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
00444 {
00445     time_t t = (value / 10000000LL) - 11644473600LL;
00446     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
00447 }
00448 
00452 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
00453 {
00454     time_t t = (value / 10000000LL) - 719162LL*86400LL;
00455     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
00456 }
00457 
00461 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
00462 {
00463     time_t t = 631112400LL + 86400*av_int2double(value);
00464     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
00465 }
00466 
00467 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
00468 {
00469     char mime[1024];
00470     char description[1024];
00471     unsigned int filesize;
00472     AVStream *st;
00473     int64_t pos = avio_tell(pb);
00474 
00475     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
00476     if (strcmp(mime, "image/jpeg"))
00477         goto done;
00478 
00479     avio_r8(pb);
00480     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
00481     filesize = avio_rl32(pb);
00482     if (!filesize)
00483         goto done;
00484 
00485     st = avformat_new_stream(s, NULL);
00486     if (!st)
00487         goto done;
00488     av_dict_set(&st->metadata, "title", description, 0);
00489     st->codec->codec_id   = CODEC_ID_MJPEG;
00490     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
00491     st->codec->extradata  = av_mallocz(filesize);
00492     st->id = -1;
00493     if (!st->codec->extradata)
00494         goto done;
00495     st->codec->extradata_size = filesize;
00496     avio_read(pb, st->codec->extradata, filesize);
00497 done:
00498     avio_seek(pb, pos + length, SEEK_SET);
00499 }
00500 
00501 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
00502 {
00503     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
00504     char *buf = av_malloc(buf_size);
00505     if (!buf)
00506         return;
00507 
00508     if (type == 0 && length == 4) {
00509         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
00510     } else if (type == 1) {
00511         avio_get_str16le(pb, length, buf, buf_size);
00512         if (!strlen(buf)) {
00513            av_free(buf);
00514            return;
00515         }
00516     } else if (type == 3 && length == 4) {
00517         strcpy(buf, avio_rl32(pb) ? "true" : "false");
00518     } else if (type == 4 && length == 8) {
00519         int64_t num = avio_rl64(pb);
00520         if (!strcmp(key, "WM/EncodingTime") ||
00521             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
00522             filetime_to_iso8601(buf, buf_size, num);
00523         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
00524                  !strcmp(key, "WM/WMRVEndTime"))
00525             crazytime_to_iso8601(buf, buf_size, num);
00526         else if (!strcmp(key, "WM/WMRVExpirationDate"))
00527             oledate_to_iso8601(buf, buf_size, num);
00528         else if (!strcmp(key, "WM/WMRVBitrate"))
00529             snprintf(buf, buf_size, "%f", av_int2double(num));
00530         else
00531             snprintf(buf, buf_size, "%"PRIi64, num);
00532     } else if (type == 5 && length == 2) {
00533         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
00534     } else if (type == 6 && length == 16) {
00535         ff_asf_guid guid;
00536         avio_read(pb, guid, 16);
00537         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
00538     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
00539         get_attachment(s, pb, length);
00540         av_freep(&buf);
00541         return;
00542     } else {
00543         av_freep(&buf);
00544         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
00545         avio_skip(pb, length);
00546         return;
00547     }
00548 
00549     av_dict_set(&s->metadata, key, buf, 0);
00550     av_freep(&buf);
00551 }
00552 
00556 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
00557 {
00558     ff_asf_guid guid;
00559     int length, type;
00560     while(!pb->eof_reached) {
00561         char key[1024];
00562         ff_get_guid(pb, &guid);
00563         type   = avio_rl32(pb);
00564         length = avio_rl32(pb);
00565         if (!length)
00566             break;
00567         if (ff_guidcmp(&guid, metadata_guid)) {
00568             av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
00569                    "remaining metadata entries ignored\n", ARG_GUID(guid));
00570             break;
00571         }
00572         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
00573         get_tag(s, pb, key, type, length);
00574     }
00575 
00576     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00577 }
00578 
00583 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
00584 {
00585     WtvContext *wtv = s->priv_data;
00586     AVIOContext *pb = wtv->pb;
00587 
00588     avio_skip(pb, 72);  // picture aspect ratio is unreliable
00589     ff_get_bmp_header(pb, st);
00590 
00591     return 72 + 40;
00592 }
00593 
00597 static void parse_mpeg1waveformatex(AVStream *st)
00598 {
00599     /* fwHeadLayer */
00600     switch (AV_RL16(st->codec->extradata)) {
00601     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
00602     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
00603     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
00604     }
00605 
00606     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
00607 
00608     /* dwHeadMode */
00609     switch (AV_RL16(st->codec->extradata + 6)) {
00610     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
00611     case 8 :                   st->codec->channels = 1; break;
00612     }
00613 }
00614 
00620 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
00621 {
00622     if (st) {
00623         if (st->codec->extradata) {
00624             av_freep(&st->codec->extradata);
00625             st->codec->extradata_size = 0;
00626         }
00627     } else {
00628         WtvStream *wst = av_mallocz(sizeof(WtvStream));
00629         if (!wst)
00630             return NULL;
00631         st = avformat_new_stream(s, NULL);
00632         if (!st)
00633             return NULL;
00634         st->id = sid;
00635         st->priv_data = wst;
00636     }
00637     st->codec->codec_type = codec_type;
00638     st->need_parsing      = AVSTREAM_PARSE_FULL;
00639     avpriv_set_pts_info(st, 64, 1, 10000000);
00640     return st;
00641 }
00642 
00652 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
00653                                    ff_asf_guid mediatype, ff_asf_guid subtype,
00654                                    ff_asf_guid formattype, int size)
00655 {
00656     WtvContext *wtv = s->priv_data;
00657     AVIOContext *pb = wtv->pb;
00658     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
00659         !ff_guidcmp(formattype, format_cpfilters_processed)) {
00660         ff_asf_guid actual_subtype;
00661         ff_asf_guid actual_formattype;
00662 
00663         if (size < 32) {
00664             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
00665             avio_skip(pb, size);
00666             return NULL;
00667         }
00668 
00669         avio_skip(pb, size - 32);
00670         ff_get_guid(pb, &actual_subtype);
00671         ff_get_guid(pb, &actual_formattype);
00672         avio_seek(pb, -size, SEEK_CUR);
00673 
00674         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
00675         avio_skip(pb, 32);
00676         return st;
00677     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
00678         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
00679         if (!st)
00680             return NULL;
00681         if (!ff_guidcmp(formattype, format_waveformatex)) {
00682             int ret = ff_get_wav_header(pb, st->codec, size);
00683             if (ret < 0)
00684                 return NULL;
00685         } else {
00686             if (ff_guidcmp(formattype, format_none))
00687                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00688             avio_skip(pb, size);
00689         }
00690 
00691         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
00692             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
00693         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
00694             if (st->codec->extradata && st->codec->extradata_size >= 22)
00695                 parse_mpeg1waveformatex(st);
00696             else
00697                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
00698         } else {
00699             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
00700             if (st->codec->codec_id == CODEC_ID_NONE)
00701                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
00702         }
00703         return st;
00704     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
00705         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
00706         if (!st)
00707             return NULL;
00708         if (!ff_guidcmp(formattype, format_videoinfo2)) {
00709             int consumed = parse_videoinfoheader2(s, st);
00710             avio_skip(pb, FFMAX(size - consumed, 0));
00711         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
00712             int consumed = parse_videoinfoheader2(s, st);
00713             avio_skip(pb, FFMAX(size - consumed, 0));
00714         } else {
00715             if (ff_guidcmp(formattype, format_none))
00716                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00717             avio_skip(pb, size);
00718         }
00719 
00720         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
00721             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
00722         } else {
00723             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
00724         }
00725         if (st->codec->codec_id == CODEC_ID_NONE)
00726             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
00727         return st;
00728     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
00729                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
00730         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
00731         if (!st)
00732             return NULL;
00733         if (ff_guidcmp(formattype, format_none))
00734             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00735         avio_skip(pb, size);
00736         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
00737         return st;
00738     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
00739                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
00740         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
00741         if (!st)
00742             return NULL;
00743         if (ff_guidcmp(formattype, format_none))
00744             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00745         avio_skip(pb, size);
00746         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
00747         return st;
00748     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
00749                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
00750         if (ff_guidcmp(formattype, format_none))
00751             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00752         avio_skip(pb, size);
00753         return NULL;
00754     }
00755 
00756     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
00757                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
00758                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
00759     avio_skip(pb, size);
00760     return NULL;
00761 }
00762 
00763 enum {
00764     SEEK_TO_DATA = 0,
00765     SEEK_TO_PTS,
00766 };
00767 
00775 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
00776 {
00777     WtvContext *wtv = s->priv_data;
00778     AVIOContext *pb = wtv->pb;
00779     while (!pb->eof_reached) {
00780         ff_asf_guid g;
00781         int len, sid, consumed;
00782 
00783         ff_get_guid(pb, &g);
00784         len = avio_rl32(pb);
00785         if (len < 32)
00786             break;
00787         sid = avio_rl32(pb) & 0x7FFF;
00788         avio_skip(pb, 8);
00789         consumed = 32;
00790 
00791         if (!ff_guidcmp(g, stream_guid)) {
00792             if (ff_find_stream_index(s, sid) < 0) {
00793                 ff_asf_guid mediatype, subtype, formattype;
00794                 int size;
00795                 avio_skip(pb, 28);
00796                 ff_get_guid(pb, &mediatype);
00797                 ff_get_guid(pb, &subtype);
00798                 avio_skip(pb, 12);
00799                 ff_get_guid(pb, &formattype);
00800                 size = avio_rl32(pb);
00801                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
00802                 consumed += 92 + size;
00803             }
00804         } else if (!ff_guidcmp(g, stream2_guid)) {
00805             int stream_index = ff_find_stream_index(s, sid);
00806             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
00807                 ff_asf_guid mediatype, subtype, formattype;
00808                 int size;
00809                 avio_skip(pb, 12);
00810                 ff_get_guid(pb, &mediatype);
00811                 ff_get_guid(pb, &subtype);
00812                 avio_skip(pb, 12);
00813                 ff_get_guid(pb, &formattype);
00814                 size = avio_rl32(pb);
00815                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
00816                 consumed += 76 + size;
00817             }
00818         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
00819                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
00820                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
00821                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
00822                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
00823                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
00824             int stream_index = ff_find_stream_index(s, sid);
00825             if (stream_index >= 0) {
00826                 AVStream *st = s->streams[stream_index];
00827                 uint8_t buf[258];
00828                 const uint8_t *pbuf = buf;
00829                 int buf_size;
00830 
00831                 avio_skip(pb, 8);
00832                 consumed += 8;
00833                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
00834                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
00835                     avio_skip(pb, 6);
00836                     consumed += 6;
00837                 }
00838 
00839                 buf_size = FFMIN(len - consumed, sizeof(buf));
00840                 avio_read(pb, buf, buf_size);
00841                 consumed += buf_size;
00842                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
00843             }
00844         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
00845             int stream_index = ff_find_stream_index(s, sid);
00846             if (stream_index >= 0) {
00847                 AVStream *st = s->streams[stream_index];
00848                 int audio_type;
00849                 avio_skip(pb, 8);
00850                 audio_type = avio_r8(pb);
00851                 if (audio_type == 2)
00852                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
00853                 else if (audio_type == 3)
00854                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
00855                 consumed += 9;
00856             }
00857         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
00858             int stream_index = ff_find_stream_index(s, sid);
00859             if (stream_index >= 0) {
00860                 avio_skip(pb, 12);
00861                 if (avio_rl32(pb))
00862                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
00863                 consumed += 16;
00864             }
00865         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
00866             int stream_index = ff_find_stream_index(s, sid);
00867             if (stream_index >= 0) {
00868                 AVStream *st = s->streams[stream_index];
00869                 uint8_t language[4];
00870                 avio_skip(pb, 12);
00871                 avio_read(pb, language, 3);
00872                 if (language[0]) {
00873                     language[3] = 0;
00874                     av_dict_set(&st->metadata, "language", language, 0);
00875                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
00876                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
00877                 }
00878                 consumed += 15;
00879             }
00880         } else if (!ff_guidcmp(g, timestamp_guid)) {
00881             int stream_index = ff_find_stream_index(s, sid);
00882             if (stream_index >= 0) {
00883                 avio_skip(pb, 8);
00884                 wtv->pts = avio_rl64(pb);
00885                 consumed += 16;
00886                 if (wtv->pts == -1)
00887                     wtv->pts = AV_NOPTS_VALUE;
00888                 else {
00889                     wtv->last_valid_pts = wtv->pts;
00890                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
00891                         wtv->epoch = wtv->pts;
00892                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
00893 #define WTV_PAD8(x) (((x) + 7) & ~7)
00894                     avio_skip(pb, WTV_PAD8(len) - consumed);
00895                     return 0;
00896                 }
00897                 }
00898             }
00899         } else if (!ff_guidcmp(g, data_guid)) {
00900             int stream_index = ff_find_stream_index(s, sid);
00901             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
00902                 WtvStream *wst = s->streams[stream_index]->priv_data;
00903                 wst->seen_data = 1;
00904                 if (len_ptr) {
00905                     *len_ptr = len;
00906                 }
00907                 return stream_index;
00908             }
00909         } else if (
00910             !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}) ||
00911             !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}) ||
00912             !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}) ||
00913             !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}) ||
00914             !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}) ||
00915             !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}) ||
00916             !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}) ||
00917             !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}) ||
00918             !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}) ||
00919             !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}) ||
00920             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
00921             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
00922             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
00923             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
00924             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
00925             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
00926             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
00927             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
00928             //ignore known guids
00929         } else
00930             av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
00931 
00932         avio_skip(pb, WTV_PAD8(len) - consumed);
00933     }
00934     return AVERROR_EOF;
00935 }
00936 
00937 /* declare utf16le strings */
00938 #define _ , 0,
00939 static const uint8_t timeline_le16[] =
00940     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
00941 static const uint8_t table_0_entries_legacy_attrib_le16[] =
00942     {'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};
00943 static const uint8_t table_0_entries_time_le16[] =
00944     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
00945 static const uint8_t timeline_table_0_entries_Events_le16[] =
00946     {'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};
00947 #undef _
00948 
00949 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
00950 {
00951     WtvContext *wtv = s->priv_data;
00952     int root_sector, root_size;
00953     uint8_t root[WTV_SECTOR_SIZE];
00954     AVIOContext *pb;
00955     int64_t timeline_pos;
00956     int ret;
00957 
00958     wtv->epoch          =
00959     wtv->pts            =
00960     wtv->last_valid_pts = AV_NOPTS_VALUE;
00961 
00962     /* read root directory sector */
00963     avio_skip(s->pb, 0x30);
00964     root_size = avio_rl32(s->pb);
00965     if (root_size > sizeof(root)) {
00966         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
00967         return AVERROR_INVALIDDATA;
00968     }
00969     avio_skip(s->pb, 4);
00970     root_sector = avio_rl32(s->pb);
00971 
00972     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
00973     root_size = avio_read(s->pb, root, root_size);
00974     if (root_size < 0)
00975         return AVERROR_INVALIDDATA;
00976 
00977     /* parse chunks up until first data chunk */
00978     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
00979     if (!wtv->pb) {
00980         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
00981         return AVERROR_INVALIDDATA;
00982     }
00983 
00984     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
00985     if (ret < 0)
00986         return ret;
00987     avio_seek(wtv->pb, -32, SEEK_CUR);
00988 
00989     timeline_pos = avio_tell(s->pb); // save before opening another file
00990 
00991     /* read metadata */
00992     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
00993     if (pb) {
00994         parse_legacy_attrib(s, pb);
00995         wtvfile_close(pb);
00996     }
00997 
00998     /* read seek index */
00999     if (s->nb_streams) {
01000         AVStream *st = s->streams[0];
01001         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
01002         if (pb) {
01003             while(1) {
01004                 uint64_t timestamp = avio_rl64(pb);
01005                 uint64_t frame_nb  = avio_rl64(pb);
01006                 if (pb->eof_reached)
01007                     break;
01008                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
01009                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
01010             }
01011             wtvfile_close(pb);
01012 
01013             if (wtv->nb_index_entries) {
01014                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
01015                 if (pb) {
01016                     int i;
01017                     while (1) {
01018                         uint64_t frame_nb = avio_rl64(pb);
01019                         uint64_t position = avio_rl64(pb);
01020                         if (pb->eof_reached)
01021                             break;
01022                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
01023                             AVIndexEntry *e = wtv->index_entries + i;
01024                             if (frame_nb > e->size)
01025                                 break;
01026                             if (position > e->pos)
01027                                 e->pos = position;
01028                         }
01029                     }
01030                     wtvfile_close(pb);
01031                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
01032                 }
01033             }
01034         }
01035     }
01036 
01037     avio_seek(s->pb, timeline_pos, SEEK_SET);
01038     return 0;
01039 }
01040 
01041 static int read_packet(AVFormatContext *s, AVPacket *pkt)
01042 {
01043     WtvContext *wtv = s->priv_data;
01044     AVIOContext *pb = wtv->pb;
01045     int stream_index, len, ret;
01046 
01047     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
01048     if (stream_index < 0)
01049         return stream_index;
01050 
01051     ret = av_get_packet(pb, pkt, len - 32);
01052     if (ret < 0)
01053         return ret;
01054     pkt->stream_index = stream_index;
01055     pkt->pts          = wtv->pts;
01056     avio_skip(pb, WTV_PAD8(len) - len);
01057     return 0;
01058 }
01059 
01060 static int read_seek(AVFormatContext *s, int stream_index,
01061                      int64_t ts, int flags)
01062 {
01063     WtvContext *wtv = s->priv_data;
01064     AVIOContext *pb = wtv->pb;
01065     AVStream *st = s->streams[0];
01066     int64_t ts_relative;
01067     int i;
01068 
01069     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
01070         return AVERROR(ENOSYS);
01071 
01072     /* timestamp adjustment is required because wtv->pts values are absolute,
01073      * whereas AVIndexEntry->timestamp values are relative to epoch. */
01074     ts_relative = ts;
01075     if (wtv->epoch != AV_NOPTS_VALUE)
01076         ts_relative -= wtv->epoch;
01077 
01078     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
01079     if (i < 0) {
01080         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
01081             avio_seek(pb, 0, SEEK_SET);
01082         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
01083             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
01084         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
01085             return AVERROR(ERANGE);
01086         return 0;
01087     }
01088     wtv->pts = wtv->index_entries[i].timestamp;
01089     if (wtv->epoch != AV_NOPTS_VALUE)
01090         wtv->pts += wtv->epoch;
01091     wtv->last_valid_pts = wtv->pts;
01092     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
01093     return 0;
01094 }
01095 
01096 static int read_close(AVFormatContext *s)
01097 {
01098     WtvContext *wtv = s->priv_data;
01099     av_free(wtv->index_entries);
01100     wtvfile_close(wtv->pb);
01101     return 0;
01102 }
01103 
01104 AVInputFormat ff_wtv_demuxer = {
01105     .name           = "wtv",
01106     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
01107     .priv_data_size = sizeof(WtvContext),
01108     .read_probe     = read_probe,
01109     .read_header    = read_header,
01110     .read_packet    = read_packet,
01111     .read_seek      = read_seek,
01112     .read_close     = read_close,
01113     .flags          = AVFMT_SHOW_IDS,
01114 };