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 (name_size < 0) {
00277             av_log(s, AV_LOG_ERROR,
00278                    "bad filename length, remaining directory entries ignored\n");
00279             break;
00280         }
00281         if (48 + name_size > buf_end - buf) {
00282             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
00283             break;
00284         }
00285         first_sector = AV_RL32(buf + 40 + name_size);
00286         depth        = AV_RL32(buf + 44 + name_size);
00287 
00288         /* compare file name; test optional null terminator */
00289         name = buf + 40;
00290         if (name_size >= filename_size &&
00291             !memcmp(name, filename, filename_size) &&
00292             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
00293             return wtvfile_open_sector(first_sector, file_length, depth, s);
00294 
00295         buf += dir_length;
00296     }
00297     return 0;
00298 }
00299 
00300 #define wtvfile_open(s, buf, buf_size, filename) \
00301     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
00302 
00306 static void wtvfile_close(AVIOContext *pb)
00307 {
00308     WtvFile *wf = pb->opaque;
00309     av_free(wf->sectors);
00310     av_free(wf);
00311     av_free(pb->buffer);
00312     av_free(pb);
00313 }
00314 
00315 /*
00316  *
00317  * Main demuxer
00318  *
00319  */
00320 
00321 typedef struct {
00322     int seen_data;
00323 } WtvStream;
00324 
00325 typedef struct {
00326     AVIOContext *pb;       
00327     int64_t epoch;
00328     int64_t pts;             
00329     int64_t last_valid_pts;  
00331     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
00332        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
00333     AVIndexEntry *index_entries;
00334     int nb_index_entries;
00335     unsigned int index_entries_allocated_size;
00336 } WtvContext;
00337 
00338 typedef struct {
00339     enum CodecID id;
00340     ff_asf_guid guid;
00341 } AVCodecGuid;
00342 
00343 static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
00344 {
00345     int i;
00346     for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
00347         if (!ff_guidcmp(guids[i].guid, guid))
00348             return guids[i].id;
00349     }
00350     return CODEC_ID_NONE;
00351 }
00352 
00353 /* WTV GUIDs */
00354 static const ff_asf_guid wtv_guid =
00355     {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
00356 static const ff_asf_guid metadata_guid =
00357     {0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
00358 static const ff_asf_guid timestamp_guid =
00359     {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
00360 static const ff_asf_guid data_guid =
00361     {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
00362 static const ff_asf_guid stream_guid =
00363     {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
00364 static const ff_asf_guid stream2_guid =
00365     {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
00366 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
00367     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
00368 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
00369     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
00370 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
00371     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
00372 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
00373     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
00374 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
00375     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
00376 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
00377     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
00378 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
00379     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
00380 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
00381     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
00382 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
00383     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
00384 
00385 /* Windows media GUIDs */
00386 
00387 #define MEDIASUBTYPE_BASE_GUID \
00388     0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
00389 
00390 /* Media types */
00391 static const ff_asf_guid mediatype_audio =
00392     {'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
00393 static const ff_asf_guid mediatype_video =
00394     {'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
00395 static const ff_asf_guid mediasubtype_mpeg1payload =
00396     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
00397 static const ff_asf_guid mediatype_mpeg2_sections =
00398     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
00399 static const ff_asf_guid mediatype_mpeg2_pes =
00400     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
00401 static const ff_asf_guid mediatype_mstvcaption =
00402     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
00403 
00404 /* Media subtypes */
00405 static const ff_asf_guid mediasubtype_cpfilters_processed =
00406     {0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
00407 static const ff_asf_guid mediasubtype_dvb_subtitle =
00408     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
00409 static const ff_asf_guid mediasubtype_teletext =
00410     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
00411 static const ff_asf_guid mediasubtype_dtvccdata =
00412     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
00413 static const ff_asf_guid mediasubtype_mpeg2_sections =
00414     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
00415 
00416 /* Formats */
00417 static const ff_asf_guid format_cpfilters_processed =
00418     {0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
00419 static const ff_asf_guid format_waveformatex =
00420     {0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
00421 static const ff_asf_guid format_videoinfo2 =
00422     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
00423 static const ff_asf_guid format_mpeg2_video =
00424     {0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
00425 static const ff_asf_guid format_none =
00426     {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
00427 
00428 static const AVCodecGuid video_guids[] = {
00429     {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00430     {CODEC_ID_NONE}
00431 };
00432 
00433 static const AVCodecGuid audio_guids[] = {
00434     {CODEC_ID_AC3,        {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00435     {CODEC_ID_EAC3,       {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
00436     {CODEC_ID_MP2,        {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
00437     {CODEC_ID_NONE}
00438 };
00439 
00440 static int read_probe(AVProbeData *p)
00441 {
00442     return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
00443 }
00444 
00448 static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
00449 {
00450     time_t t = (value / 10000000LL) - 11644473600LL;
00451     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
00452 }
00453 
00457 static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
00458 {
00459     time_t t = (value / 10000000LL) - 719162LL*86400LL;
00460     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
00461 }
00462 
00466 static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
00467 {
00468     time_t t = 631112400LL + 86400*av_int2double(value);
00469     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
00470 }
00471 
00472 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
00473 {
00474     char mime[1024];
00475     char description[1024];
00476     unsigned int filesize;
00477     AVStream *st;
00478     int64_t pos = avio_tell(pb);
00479 
00480     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
00481     if (strcmp(mime, "image/jpeg"))
00482         goto done;
00483 
00484     avio_r8(pb);
00485     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
00486     filesize = avio_rl32(pb);
00487     if (!filesize)
00488         goto done;
00489 
00490     st = avformat_new_stream(s, NULL);
00491     if (!st)
00492         goto done;
00493     av_dict_set(&st->metadata, "title", description, 0);
00494     st->codec->codec_id   = CODEC_ID_MJPEG;
00495     st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
00496     st->codec->extradata  = av_mallocz(filesize);
00497     st->id = -1;
00498     if (!st->codec->extradata)
00499         goto done;
00500     st->codec->extradata_size = filesize;
00501     avio_read(pb, st->codec->extradata, filesize);
00502 done:
00503     avio_seek(pb, pos + length, SEEK_SET);
00504 }
00505 
00506 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
00507 {
00508     int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
00509     char *buf = av_malloc(buf_size);
00510     if (!buf)
00511         return;
00512 
00513     if (type == 0 && length == 4) {
00514         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
00515     } else if (type == 1) {
00516         avio_get_str16le(pb, length, buf, buf_size);
00517         if (!strlen(buf)) {
00518            av_free(buf);
00519            return;
00520         }
00521     } else if (type == 3 && length == 4) {
00522         strcpy(buf, avio_rl32(pb) ? "true" : "false");
00523     } else if (type == 4 && length == 8) {
00524         int64_t num = avio_rl64(pb);
00525         if (!strcmp(key, "WM/EncodingTime") ||
00526             !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
00527             filetime_to_iso8601(buf, buf_size, num);
00528         else if (!strcmp(key, "WM/WMRVEncodeTime") ||
00529                  !strcmp(key, "WM/WMRVEndTime"))
00530             crazytime_to_iso8601(buf, buf_size, num);
00531         else if (!strcmp(key, "WM/WMRVExpirationDate"))
00532             oledate_to_iso8601(buf, buf_size, num);
00533         else if (!strcmp(key, "WM/WMRVBitrate"))
00534             snprintf(buf, buf_size, "%f", av_int2double(num));
00535         else
00536             snprintf(buf, buf_size, "%"PRIi64, num);
00537     } else if (type == 5 && length == 2) {
00538         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
00539     } else if (type == 6 && length == 16) {
00540         ff_asf_guid guid;
00541         avio_read(pb, guid, 16);
00542         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
00543     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
00544         get_attachment(s, pb, length);
00545         av_freep(&buf);
00546         return;
00547     } else {
00548         av_freep(&buf);
00549         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
00550         avio_skip(pb, length);
00551         return;
00552     }
00553 
00554     av_dict_set(&s->metadata, key, buf, 0);
00555     av_freep(&buf);
00556 }
00557 
00561 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
00562 {
00563     ff_asf_guid guid;
00564     int length, type;
00565     while(!pb->eof_reached) {
00566         char key[1024];
00567         ff_get_guid(pb, &guid);
00568         type   = avio_rl32(pb);
00569         length = avio_rl32(pb);
00570         if (!length)
00571             break;
00572         if (ff_guidcmp(&guid, metadata_guid)) {
00573             av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
00574                    "remaining metadata entries ignored\n", ARG_GUID(guid));
00575             break;
00576         }
00577         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
00578         get_tag(s, pb, key, type, length);
00579     }
00580 
00581     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00582 }
00583 
00588 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
00589 {
00590     WtvContext *wtv = s->priv_data;
00591     AVIOContext *pb = wtv->pb;
00592 
00593     avio_skip(pb, 72);  // picture aspect ratio is unreliable
00594     ff_get_bmp_header(pb, st);
00595 
00596     return 72 + 40;
00597 }
00598 
00602 static void parse_mpeg1waveformatex(AVStream *st)
00603 {
00604     /* fwHeadLayer */
00605     switch (AV_RL16(st->codec->extradata)) {
00606     case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
00607     case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
00608     case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
00609     }
00610 
00611     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
00612 
00613     /* dwHeadMode */
00614     switch (AV_RL16(st->codec->extradata + 6)) {
00615     case 1 : case 2 : case 4 : st->codec->channels = 2; break;
00616     case 8 :                   st->codec->channels = 1; break;
00617     }
00618 }
00619 
00625 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
00626 {
00627     if (st) {
00628         if (st->codec->extradata) {
00629             av_freep(&st->codec->extradata);
00630             st->codec->extradata_size = 0;
00631         }
00632     } else {
00633         WtvStream *wst = av_mallocz(sizeof(WtvStream));
00634         if (!wst)
00635             return NULL;
00636         st = avformat_new_stream(s, NULL);
00637         if (!st)
00638             return NULL;
00639         st->id = sid;
00640         st->priv_data = wst;
00641     }
00642     st->codec->codec_type = codec_type;
00643     st->need_parsing      = AVSTREAM_PARSE_FULL;
00644     avpriv_set_pts_info(st, 64, 1, 10000000);
00645     return st;
00646 }
00647 
00657 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
00658                                    ff_asf_guid mediatype, ff_asf_guid subtype,
00659                                    ff_asf_guid formattype, int size)
00660 {
00661     WtvContext *wtv = s->priv_data;
00662     AVIOContext *pb = wtv->pb;
00663     if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
00664         !ff_guidcmp(formattype, format_cpfilters_processed)) {
00665         ff_asf_guid actual_subtype;
00666         ff_asf_guid actual_formattype;
00667 
00668         if (size < 32) {
00669             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
00670             avio_skip(pb, size);
00671             return NULL;
00672         }
00673 
00674         avio_skip(pb, size - 32);
00675         ff_get_guid(pb, &actual_subtype);
00676         ff_get_guid(pb, &actual_formattype);
00677         avio_seek(pb, -size, SEEK_CUR);
00678 
00679         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
00680         avio_skip(pb, 32);
00681         return st;
00682     } else if (!ff_guidcmp(mediatype, mediatype_audio)) {
00683         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
00684         if (!st)
00685             return NULL;
00686         if (!ff_guidcmp(formattype, format_waveformatex)) {
00687             int ret = ff_get_wav_header(pb, st->codec, size);
00688             if (ret < 0)
00689                 return NULL;
00690         } else {
00691             if (ff_guidcmp(formattype, format_none))
00692                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00693             avio_skip(pb, size);
00694         }
00695 
00696         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
00697             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
00698         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
00699             if (st->codec->extradata && st->codec->extradata_size >= 22)
00700                 parse_mpeg1waveformatex(st);
00701             else
00702                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
00703         } else {
00704             st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
00705             if (st->codec->codec_id == CODEC_ID_NONE)
00706                 av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
00707         }
00708         return st;
00709     } else if (!ff_guidcmp(mediatype, mediatype_video)) {
00710         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
00711         if (!st)
00712             return NULL;
00713         if (!ff_guidcmp(formattype, format_videoinfo2)) {
00714             int consumed = parse_videoinfoheader2(s, st);
00715             avio_skip(pb, FFMAX(size - consumed, 0));
00716         } else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
00717             int consumed = parse_videoinfoheader2(s, st);
00718             avio_skip(pb, FFMAX(size - consumed, 0));
00719         } else {
00720             if (ff_guidcmp(formattype, format_none))
00721                 av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00722             avio_skip(pb, size);
00723         }
00724 
00725         if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
00726             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
00727         } else {
00728             st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
00729         }
00730         if (st->codec->codec_id == CODEC_ID_NONE)
00731             av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
00732         return st;
00733     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
00734                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
00735         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
00736         if (!st)
00737             return NULL;
00738         if (ff_guidcmp(formattype, format_none))
00739             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00740         avio_skip(pb, size);
00741         st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;
00742         return st;
00743     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
00744                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
00745         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
00746         if (!st)
00747             return NULL;
00748         if (ff_guidcmp(formattype, format_none))
00749             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00750         avio_skip(pb, size);
00751         st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;
00752         return st;
00753     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
00754                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
00755         if (ff_guidcmp(formattype, format_none))
00756             av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
00757         avio_skip(pb, size);
00758         return NULL;
00759     }
00760 
00761     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
00762                               ", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
00763                               ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
00764     avio_skip(pb, size);
00765     return NULL;
00766 }
00767 
00768 enum {
00769     SEEK_TO_DATA = 0,
00770     SEEK_TO_PTS,
00771 };
00772 
00780 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
00781 {
00782     WtvContext *wtv = s->priv_data;
00783     AVIOContext *pb = wtv->pb;
00784     while (!pb->eof_reached) {
00785         ff_asf_guid g;
00786         int len, sid, consumed;
00787 
00788         ff_get_guid(pb, &g);
00789         len = avio_rl32(pb);
00790         if (len < 32)
00791             break;
00792         sid = avio_rl32(pb) & 0x7FFF;
00793         avio_skip(pb, 8);
00794         consumed = 32;
00795 
00796         if (!ff_guidcmp(g, stream_guid)) {
00797             if (ff_find_stream_index(s, sid) < 0) {
00798                 ff_asf_guid mediatype, subtype, formattype;
00799                 int size;
00800                 avio_skip(pb, 28);
00801                 ff_get_guid(pb, &mediatype);
00802                 ff_get_guid(pb, &subtype);
00803                 avio_skip(pb, 12);
00804                 ff_get_guid(pb, &formattype);
00805                 size = avio_rl32(pb);
00806                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
00807                 consumed += 92 + size;
00808             }
00809         } else if (!ff_guidcmp(g, stream2_guid)) {
00810             int stream_index = ff_find_stream_index(s, sid);
00811             if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
00812                 ff_asf_guid mediatype, subtype, formattype;
00813                 int size;
00814                 avio_skip(pb, 12);
00815                 ff_get_guid(pb, &mediatype);
00816                 ff_get_guid(pb, &subtype);
00817                 avio_skip(pb, 12);
00818                 ff_get_guid(pb, &formattype);
00819                 size = avio_rl32(pb);
00820                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
00821                 consumed += 76 + size;
00822             }
00823         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
00824                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
00825                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
00826                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
00827                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
00828                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
00829             int stream_index = ff_find_stream_index(s, sid);
00830             if (stream_index >= 0) {
00831                 AVStream *st = s->streams[stream_index];
00832                 uint8_t buf[258];
00833                 const uint8_t *pbuf = buf;
00834                 int buf_size;
00835 
00836                 avio_skip(pb, 8);
00837                 consumed += 8;
00838                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
00839                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
00840                     avio_skip(pb, 6);
00841                     consumed += 6;
00842                 }
00843 
00844                 buf_size = FFMIN(len - consumed, sizeof(buf));
00845                 avio_read(pb, buf, buf_size);
00846                 consumed += buf_size;
00847                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
00848             }
00849         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
00850             int stream_index = ff_find_stream_index(s, sid);
00851             if (stream_index >= 0) {
00852                 AVStream *st = s->streams[stream_index];
00853                 int audio_type;
00854                 avio_skip(pb, 8);
00855                 audio_type = avio_r8(pb);
00856                 if (audio_type == 2)
00857                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
00858                 else if (audio_type == 3)
00859                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
00860                 consumed += 9;
00861             }
00862         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
00863             int stream_index = ff_find_stream_index(s, sid);
00864             if (stream_index >= 0) {
00865                 avio_skip(pb, 12);
00866                 if (avio_rl32(pb))
00867                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
00868                 consumed += 16;
00869             }
00870         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
00871             int stream_index = ff_find_stream_index(s, sid);
00872             if (stream_index >= 0) {
00873                 AVStream *st = s->streams[stream_index];
00874                 uint8_t language[4];
00875                 avio_skip(pb, 12);
00876                 avio_read(pb, language, 3);
00877                 if (language[0]) {
00878                     language[3] = 0;
00879                     av_dict_set(&st->metadata, "language", language, 0);
00880                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
00881                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
00882                 }
00883                 consumed += 15;
00884             }
00885         } else if (!ff_guidcmp(g, timestamp_guid)) {
00886             int stream_index = ff_find_stream_index(s, sid);
00887             if (stream_index >= 0) {
00888                 avio_skip(pb, 8);
00889                 wtv->pts = avio_rl64(pb);
00890                 consumed += 16;
00891                 if (wtv->pts == -1)
00892                     wtv->pts = AV_NOPTS_VALUE;
00893                 else {
00894                     wtv->last_valid_pts = wtv->pts;
00895                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
00896                         wtv->epoch = wtv->pts;
00897                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
00898 #define WTV_PAD8(x) (((x) + 7) & ~7)
00899                     avio_skip(pb, WTV_PAD8(len) - consumed);
00900                     return 0;
00901                 }
00902                 }
00903             }
00904         } else if (!ff_guidcmp(g, data_guid)) {
00905             int stream_index = ff_find_stream_index(s, sid);
00906             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
00907                 WtvStream *wst = s->streams[stream_index]->priv_data;
00908                 wst->seen_data = 1;
00909                 if (len_ptr) {
00910                     *len_ptr = len;
00911                 }
00912                 return stream_index;
00913             }
00914         } else if (
00915             !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}) ||
00916             !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}) ||
00917             !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}) ||
00918             !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}) ||
00919             !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}) ||
00920             !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}) ||
00921             !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}) ||
00922             !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}) ||
00923             !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}) ||
00924             !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}) ||
00925             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
00926             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
00927             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
00928             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
00929             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
00930             !ff_guidcmp(g, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
00931             !ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
00932             !ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
00933             //ignore known guids
00934         } else
00935             av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
00936 
00937         avio_skip(pb, WTV_PAD8(len) - consumed);
00938     }
00939     return AVERROR_EOF;
00940 }
00941 
00942 /* declare utf16le strings */
00943 #define _ , 0,
00944 static const uint8_t timeline_le16[] =
00945     {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
00946 static const uint8_t table_0_entries_legacy_attrib_le16[] =
00947     {'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};
00948 static const uint8_t table_0_entries_time_le16[] =
00949     {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
00950 static const uint8_t timeline_table_0_entries_Events_le16[] =
00951     {'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};
00952 #undef _
00953 
00954 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
00955 {
00956     WtvContext *wtv = s->priv_data;
00957     int root_sector, root_size;
00958     uint8_t root[WTV_SECTOR_SIZE];
00959     AVIOContext *pb;
00960     int64_t timeline_pos;
00961     int ret;
00962 
00963     wtv->epoch          =
00964     wtv->pts            =
00965     wtv->last_valid_pts = AV_NOPTS_VALUE;
00966 
00967     /* read root directory sector */
00968     avio_skip(s->pb, 0x30);
00969     root_size = avio_rl32(s->pb);
00970     if (root_size > sizeof(root)) {
00971         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
00972         return AVERROR_INVALIDDATA;
00973     }
00974     avio_skip(s->pb, 4);
00975     root_sector = avio_rl32(s->pb);
00976 
00977     avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
00978     root_size = avio_read(s->pb, root, root_size);
00979     if (root_size < 0)
00980         return AVERROR_INVALIDDATA;
00981 
00982     /* parse chunks up until first data chunk */
00983     wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);
00984     if (!wtv->pb) {
00985         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
00986         return AVERROR_INVALIDDATA;
00987     }
00988 
00989     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
00990     if (ret < 0)
00991         return ret;
00992     avio_seek(wtv->pb, -32, SEEK_CUR);
00993 
00994     timeline_pos = avio_tell(s->pb); // save before opening another file
00995 
00996     /* read metadata */
00997     pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);
00998     if (pb) {
00999         parse_legacy_attrib(s, pb);
01000         wtvfile_close(pb);
01001     }
01002 
01003     /* read seek index */
01004     if (s->nb_streams) {
01005         AVStream *st = s->streams[0];
01006         pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
01007         if (pb) {
01008             while(1) {
01009                 uint64_t timestamp = avio_rl64(pb);
01010                 uint64_t frame_nb  = avio_rl64(pb);
01011                 if (pb->eof_reached)
01012                     break;
01013                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
01014                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
01015             }
01016             wtvfile_close(pb);
01017 
01018             if (wtv->nb_index_entries) {
01019                 pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);
01020                 if (pb) {
01021                     int i;
01022                     while (1) {
01023                         uint64_t frame_nb = avio_rl64(pb);
01024                         uint64_t position = avio_rl64(pb);
01025                         if (pb->eof_reached)
01026                             break;
01027                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
01028                             AVIndexEntry *e = wtv->index_entries + i;
01029                             if (frame_nb > e->size)
01030                                 break;
01031                             if (position > e->pos)
01032                                 e->pos = position;
01033                         }
01034                     }
01035                     wtvfile_close(pb);
01036                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
01037                 }
01038             }
01039         }
01040     }
01041 
01042     avio_seek(s->pb, timeline_pos, SEEK_SET);
01043     return 0;
01044 }
01045 
01046 static int read_packet(AVFormatContext *s, AVPacket *pkt)
01047 {
01048     WtvContext *wtv = s->priv_data;
01049     AVIOContext *pb = wtv->pb;
01050     int stream_index, len, ret;
01051 
01052     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
01053     if (stream_index < 0)
01054         return stream_index;
01055 
01056     ret = av_get_packet(pb, pkt, len - 32);
01057     if (ret < 0)
01058         return ret;
01059     pkt->stream_index = stream_index;
01060     pkt->pts          = wtv->pts;
01061     avio_skip(pb, WTV_PAD8(len) - len);
01062     return 0;
01063 }
01064 
01065 static int read_seek(AVFormatContext *s, int stream_index,
01066                      int64_t ts, int flags)
01067 {
01068     WtvContext *wtv = s->priv_data;
01069     AVIOContext *pb = wtv->pb;
01070     AVStream *st = s->streams[0];
01071     int64_t ts_relative;
01072     int i;
01073 
01074     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
01075         return AVERROR(ENOSYS);
01076 
01077     /* timestamp adjustment is required because wtv->pts values are absolute,
01078      * whereas AVIndexEntry->timestamp values are relative to epoch. */
01079     ts_relative = ts;
01080     if (wtv->epoch != AV_NOPTS_VALUE)
01081         ts_relative -= wtv->epoch;
01082 
01083     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
01084     if (i < 0) {
01085         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)
01086             avio_seek(pb, 0, SEEK_SET);
01087         else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
01088             avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
01089         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
01090             return AVERROR(ERANGE);
01091         return 0;
01092     }
01093     wtv->pts = wtv->index_entries[i].timestamp;
01094     if (wtv->epoch != AV_NOPTS_VALUE)
01095         wtv->pts += wtv->epoch;
01096     wtv->last_valid_pts = wtv->pts;
01097     avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
01098     return 0;
01099 }
01100 
01101 static int read_close(AVFormatContext *s)
01102 {
01103     WtvContext *wtv = s->priv_data;
01104     av_free(wtv->index_entries);
01105     wtvfile_close(wtv->pb);
01106     return 0;
01107 }
01108 
01109 AVInputFormat ff_wtv_demuxer = {
01110     .name           = "wtv",
01111     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
01112     .priv_data_size = sizeof(WtvContext),
01113     .read_probe     = read_probe,
01114     .read_header    = read_header,
01115     .read_packet    = read_packet,
01116     .read_seek      = read_seek,
01117     .read_close     = read_close,
01118     .flags          = AVFMT_SHOW_IDS,
01119 };