yading@11: /*
yading@11:  * Windows Television (WTV) demuxer
yading@11:  * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Windows Television (WTV) demuxer
yading@11:  * @author Peter Ross <pross@xvid.org>
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/intfloat.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "wtv.h"
yading@11: #include "mpegts.h"
yading@11: 
yading@11: /* Macros for formating GUIDs */
yading@11: #define PRI_PRETTY_GUID \
yading@11:     "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"
yading@11: #define ARG_PRETTY_GUID(g) \
yading@11:     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]
yading@11: #define LEN_PRETTY_GUID 34
yading@11: 
yading@11: /*
yading@11:  *
yading@11:  * File system routines
yading@11:  *
yading@11:  */
yading@11: 
yading@11: typedef struct {
yading@11:     AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */
yading@11: 
yading@11:     int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */
yading@11:     uint32_t *sectors;   /** file allocation table */
yading@11:     int nb_sectors;      /** number of sectors */
yading@11: 
yading@11:     int error;
yading@11:     int64_t position;
yading@11:     int64_t length;
yading@11: } WtvFile;
yading@11: 
yading@11: /**
yading@11:  * @return bytes read, 0 on end of file, or <0 on error
yading@11:  */
yading@11: static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
yading@11: {
yading@11:     WtvFile *wf = opaque;
yading@11:     AVIOContext *pb = wf->pb_filesystem;
yading@11:     int nread = 0;
yading@11: 
yading@11:     if (wf->error || pb->error)
yading@11:         return -1;
yading@11:     if (wf->position >= wf->length || url_feof(pb))
yading@11:         return 0;
yading@11: 
yading@11:     buf_size = FFMIN(buf_size, wf->length - wf->position);
yading@11:     while(nread < buf_size) {
yading@11:         int n;
yading@11:         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
yading@11:         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
yading@11: 
yading@11:         n = avio_read(pb, buf, read_request);
yading@11:         if (n <= 0)
yading@11:             break;
yading@11:         nread += n;
yading@11:         buf += n;
yading@11:         wf->position += n;
yading@11:         if (n == remaining_in_sector) {
yading@11:             int i = wf->position >> wf->sector_bits;
yading@11:             if (i >= wf->nb_sectors ||
yading@11:                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
yading@11:                 avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
yading@11:                 wf->error = 1;
yading@11:                 break;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11:     return nread;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * @return position (or file length)
yading@11:  */
yading@11: static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
yading@11: {
yading@11:     WtvFile *wf = opaque;
yading@11:     AVIOContext *pb = wf->pb_filesystem;
yading@11: 
yading@11:     if (whence == AVSEEK_SIZE)
yading@11:         return wf->length;
yading@11:     else if (whence == SEEK_CUR)
yading@11:         offset = wf->position + offset;
yading@11:     else if (whence == SEEK_END)
yading@11:         offset = wf->length;
yading@11: 
yading@11:     wf->error = offset < 0 || offset >= wf->length ||
yading@11:                 avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
yading@11:                               + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;
yading@11:     wf->position = offset;
yading@11:     return offset;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * read non-zero integers (le32) from input stream
yading@11:  * @param pb
yading@11:  * @param[out] data destination
yading@11:  * @param     count maximum number of integers to read
yading@11:  * @return    total number of integers read
yading@11:  */
yading@11: static int read_ints(AVIOContext *pb, uint32_t *data, int count)
yading@11: {
yading@11:     int i, total = 0;
yading@11:     for (i = 0; i < count; i++) {
yading@11:         if ((data[total] = avio_rl32(pb)))
yading@11:            total++;
yading@11:     }
yading@11:     return total;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Open file
yading@11:  * @param first_sector  First sector
yading@11:  * @param length        Length of file (bytes)
yading@11:  * @param depth         File allocation table depth
yading@11:  * @return NULL on error
yading@11:  */
yading@11: static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
yading@11: {
yading@11:     AVIOContext *pb;
yading@11:     WtvFile *wf;
yading@11:     uint8_t *buffer;
yading@11: 
yading@11:     if (avio_seek(s->pb, (int64_t)first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)
yading@11:         return NULL;
yading@11: 
yading@11:     wf = av_mallocz(sizeof(WtvFile));
yading@11:     if (!wf)
yading@11:         return NULL;
yading@11: 
yading@11:     if (depth == 0) {
yading@11:         wf->sectors = av_malloc(sizeof(uint32_t));
yading@11:         if (!wf->sectors) {
yading@11:             av_free(wf);
yading@11:             return NULL;
yading@11:         }
yading@11:         wf->sectors[0]  = first_sector;
yading@11:         wf->nb_sectors  = 1;
yading@11:     } else if (depth == 1) {
yading@11:         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
yading@11:         if (!wf->sectors) {
yading@11:             av_free(wf);
yading@11:             return NULL;
yading@11:         }
yading@11:         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
yading@11:     } else if (depth == 2) {
yading@11:         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
yading@11:         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
yading@11:         int i;
yading@11: 
yading@11:         wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);
yading@11:         if (!wf->sectors) {
yading@11:             av_free(wf);
yading@11:             return NULL;
yading@11:         }
yading@11:         wf->nb_sectors = 0;
yading@11:         for (i = 0; i < nb_sectors1; i++) {
yading@11:             if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
yading@11:                 break;
yading@11:             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
yading@11:         }
yading@11:     } else {
yading@11:         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
yading@11:         av_free(wf);
yading@11:         return NULL;
yading@11:     }
yading@11:     wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
yading@11: 
yading@11:     if (!wf->nb_sectors) {
yading@11:         av_free(wf->sectors);
yading@11:         av_free(wf);
yading@11:         return NULL;
yading@11:     }
yading@11: 
yading@11:     if ((int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > avio_tell(s->pb))
yading@11:         av_log(s, AV_LOG_WARNING, "truncated file\n");
yading@11: 
yading@11:     /* check length */
yading@11:     length &= 0xFFFFFFFFFFFF;
yading@11:     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
yading@11:         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);
yading@11:         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
yading@11:     }
yading@11:     wf->length = length;
yading@11: 
yading@11:     /* seek to initial sector */
yading@11:     wf->position = 0;
yading@11:     if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
yading@11:         av_free(wf->sectors);
yading@11:         av_free(wf);
yading@11:         return NULL;
yading@11:     }
yading@11: 
yading@11:     wf->pb_filesystem = s->pb;
yading@11:     buffer = av_malloc(1 << wf->sector_bits);
yading@11:     if (!buffer) {
yading@11:         av_free(wf->sectors);
yading@11:         av_free(wf);
yading@11:         return NULL;
yading@11:     }
yading@11: 
yading@11:     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
yading@11:                            wtvfile_read_packet, NULL, wtvfile_seek);
yading@11:     if (!pb) {
yading@11:         av_free(buffer);
yading@11:         av_free(wf->sectors);
yading@11:         av_free(wf);
yading@11:     }
yading@11:     return pb;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Open file using filename
yading@11:  * @param[in]  buf       directory buffer
yading@11:  * @param      buf_size  directory buffer size
yading@11:  * @param[in]  filename
yading@11:  * @param      filename_size size of filename
yading@11:  * @return NULL on error
yading@11:  */
yading@11: static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
yading@11: {
yading@11:     const uint8_t *buf_end = buf + buf_size;
yading@11: 
yading@11:     while(buf + 48 <= buf_end) {
yading@11:         int dir_length, name_size, first_sector, depth;
yading@11:         uint64_t file_length;
yading@11:         const uint8_t *name;
yading@11:         if (ff_guidcmp(buf, ff_dir_entry_guid)) {
yading@11:             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
yading@11:                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
yading@11:             break;
yading@11:         }
yading@11:         dir_length  = AV_RL16(buf + 16);
yading@11:         file_length = AV_RL64(buf + 24);
yading@11:         name_size   = 2 * AV_RL32(buf + 32);
yading@11:         if (buf + 48 + (int64_t)name_size > buf_end || name_size<0) {
yading@11:             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
yading@11:             break;
yading@11:         }
yading@11:         first_sector = AV_RL32(buf + 40 + name_size);
yading@11:         depth        = AV_RL32(buf + 44 + name_size);
yading@11: 
yading@11:         /* compare file name; test optional null terminator */
yading@11:         name = buf + 40;
yading@11:         if (name_size >= filename_size &&
yading@11:             !memcmp(name, filename, filename_size) &&
yading@11:             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
yading@11:             return wtvfile_open_sector(first_sector, file_length, depth, s);
yading@11: 
yading@11:         buf += dir_length;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: #define wtvfile_open(s, buf, buf_size, filename) \
yading@11:     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
yading@11: 
yading@11: /**
yading@11:  * Close file opened with wtvfile_open_sector(), or wtv_open()
yading@11:  */
yading@11: static void wtvfile_close(AVIOContext *pb)
yading@11: {
yading@11:     WtvFile *wf = pb->opaque;
yading@11:     av_free(wf->sectors);
yading@11:     av_freep(&pb->opaque);
yading@11:     av_freep(&pb->buffer);
yading@11:     av_free(pb);
yading@11: }
yading@11: 
yading@11: /*
yading@11:  *
yading@11:  * Main demuxer
yading@11:  *
yading@11:  */
yading@11: 
yading@11: typedef struct {
yading@11:     int seen_data;
yading@11: } WtvStream;
yading@11: 
yading@11: typedef struct {
yading@11:     AVIOContext *pb;       /** timeline file */
yading@11:     int64_t epoch;
yading@11:     int64_t pts;             /** pts for next data chunk */
yading@11:     int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */
yading@11: 
yading@11:     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
yading@11:        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
yading@11:     AVIndexEntry *index_entries;
yading@11:     int nb_index_entries;
yading@11:     unsigned int index_entries_allocated_size;
yading@11: } WtvContext;
yading@11: 
yading@11: /* WTV GUIDs */
yading@11: static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
yading@11:     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
yading@11: static const ff_asf_guid EVENTID_LanguageSpanningEvent =
yading@11:     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
yading@11: static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
yading@11:     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
yading@11: static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
yading@11:     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
yading@11: static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
yading@11:     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
yading@11: static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
yading@11:     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
yading@11: static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
yading@11:     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
yading@11: static const ff_asf_guid EVENTID_TeletextSpanningEvent =
yading@11:     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
yading@11: static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
yading@11:     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
yading@11: 
yading@11: /* Windows media GUIDs */
yading@11: 
yading@11: /* Media types */
yading@11: static const ff_asf_guid mediasubtype_mpeg1payload =
yading@11:     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
yading@11: static const ff_asf_guid mediatype_mpeg2_sections =
yading@11:     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
yading@11: static const ff_asf_guid mediatype_mpeg2_pes =
yading@11:     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
yading@11: static const ff_asf_guid mediatype_mstvcaption =
yading@11:     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
yading@11: 
yading@11: /* Media subtypes */
yading@11: static const ff_asf_guid mediasubtype_dvb_subtitle =
yading@11:     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
yading@11: static const ff_asf_guid mediasubtype_teletext =
yading@11:     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
yading@11: static const ff_asf_guid mediasubtype_dtvccdata =
yading@11:     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
yading@11: static const ff_asf_guid mediasubtype_mpeg2_sections =
yading@11:     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
yading@11: 
yading@11: /* Formats */
yading@11: static const ff_asf_guid format_videoinfo2 =
yading@11:     {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
yading@11: 
yading@11: static int read_probe(AVProbeData *p)
yading@11: {
yading@11:     return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Convert win32 FILETIME to ISO-8601 string
yading@11:  * @return <0 on error
yading@11:  */
yading@11: static int filetime_to_iso8601(char *buf, int buf_size, int64_t value)
yading@11: {
yading@11:     time_t t = (value / 10000000LL) - 11644473600LL;
yading@11:     struct tm *tm = gmtime(&t);
yading@11:     if (!tm)
yading@11:         return -1;
yading@11:     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
yading@11:  * @return <0 on error
yading@11:  */
yading@11: static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
yading@11: {
yading@11:     time_t t = (value / 10000000LL) - 719162LL*86400LL;
yading@11:     struct tm *tm = gmtime(&t);
yading@11:     if (!tm)
yading@11:         return -1;
yading@11:     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Convert OLE DATE to ISO-8601 string
yading@11:  * @return <0 on error
yading@11:  */
yading@11: static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
yading@11: {
yading@11:     time_t t = (av_int2double(value) - 25569.0) * 86400;
yading@11:     struct tm *result= gmtime(&t);
yading@11:     if (!result)
yading@11:         return -1;
yading@11:     strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", result);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
yading@11: {
yading@11:     char mime[1024];
yading@11:     char description[1024];
yading@11:     unsigned int filesize;
yading@11:     AVStream *st;
yading@11:     int ret;
yading@11:     int64_t pos = avio_tell(pb);
yading@11: 
yading@11:     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
yading@11:     if (strcmp(mime, "image/jpeg"))
yading@11:         goto done;
yading@11: 
yading@11:     avio_r8(pb);
yading@11:     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
yading@11:     filesize = avio_rl32(pb);
yading@11:     if (!filesize)
yading@11:         goto done;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         goto done;
yading@11:     av_dict_set(&st->metadata, "title", description, 0);
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id   = AV_CODEC_ID_MJPEG;
yading@11:     ret = av_get_packet(pb, &st->attached_pic, filesize);
yading@11:     if (ret < 0)
yading@11:         goto done;
yading@11:     st->attached_pic.stream_index = st->index;
yading@11:     st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
yading@11:     st->disposition              |= AV_DISPOSITION_ATTACHED_PIC;
yading@11: done:
yading@11:     avio_seek(pb, pos + length, SEEK_SET);
yading@11: }
yading@11: 
yading@11: static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
yading@11: {
yading@11:     int buf_size;
yading@11:     char *buf;
yading@11: 
yading@11:     if (!strcmp(key, "WM/MediaThumbType")) {
yading@11:         avio_skip(pb, length);
yading@11:         return;
yading@11:     }
yading@11: 
yading@11:     buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
yading@11:     buf = av_malloc(buf_size);
yading@11:     if (!buf)
yading@11:         return;
yading@11: 
yading@11:     if (type == 0 && length == 4) {
yading@11:         snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
yading@11:     } else if (type == 1) {
yading@11:         avio_get_str16le(pb, length, buf, buf_size);
yading@11:         if (!strlen(buf)) {
yading@11:            av_free(buf);
yading@11:            return;
yading@11:         }
yading@11:     } else if (type == 3 && length == 4) {
yading@11:         strcpy(buf, avio_rl32(pb) ? "true" : "false");
yading@11:     } else if (type == 4 && length == 8) {
yading@11:         int64_t num = avio_rl64(pb);
yading@11:         if (!strcmp(key, "WM/EncodingTime") ||
yading@11:             !strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
yading@11:             if (filetime_to_iso8601(buf, buf_size, num) < 0) {
yading@11:                 av_free(buf);
yading@11:                 return;
yading@11:             }
yading@11:         } else if (!strcmp(key, "WM/WMRVEncodeTime") ||
yading@11:                    !strcmp(key, "WM/WMRVEndTime")) {
yading@11:             if (crazytime_to_iso8601(buf, buf_size, num) < 0) {
yading@11:                 av_free(buf);
yading@11:                 return;
yading@11:             }
yading@11:         } else if (!strcmp(key, "WM/WMRVExpirationDate")) {
yading@11:             if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {
yading@11:                 av_free(buf);
yading@11:                 return;
yading@11:             }
yading@11:         } else if (!strcmp(key, "WM/WMRVBitrate"))
yading@11:             snprintf(buf, buf_size, "%f", av_int2double(num));
yading@11:         else
yading@11:             snprintf(buf, buf_size, "%"PRIi64, num);
yading@11:     } else if (type == 5 && length == 2) {
yading@11:         snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
yading@11:     } else if (type == 6 && length == 16) {
yading@11:         ff_asf_guid guid;
yading@11:         avio_read(pb, guid, 16);
yading@11:         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
yading@11:     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
yading@11:         get_attachment(s, pb, length);
yading@11:         av_freep(&buf);
yading@11:         return;
yading@11:     } else {
yading@11:         av_freep(&buf);
yading@11:         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
yading@11:         avio_skip(pb, length);
yading@11:         return;
yading@11:     }
yading@11: 
yading@11:     av_dict_set(&s->metadata, key, buf, 0);
yading@11:     av_freep(&buf);
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Parse metadata entries
yading@11:  */
yading@11: static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
yading@11: {
yading@11:     ff_asf_guid guid;
yading@11:     int length, type;
yading@11:     while(!url_feof(pb)) {
yading@11:         char key[1024];
yading@11:         ff_get_guid(pb, &guid);
yading@11:         type   = avio_rl32(pb);
yading@11:         length = avio_rl32(pb);
yading@11:         if (!length)
yading@11:             break;
yading@11:         if (ff_guidcmp(&guid, ff_metadata_guid)) {
yading@11:             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
yading@11:                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
yading@11:             break;
yading@11:         }
yading@11:         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
yading@11:         get_tag(s, pb, key, type, length);
yading@11:     }
yading@11: 
yading@11:     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * parse VIDEOINFOHEADER2 structure
yading@11:  * @return bytes consumed
yading@11:  */
yading@11: static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
yading@11: {
yading@11:     WtvContext *wtv = s->priv_data;
yading@11:     AVIOContext *pb = wtv->pb;
yading@11: 
yading@11:     avio_skip(pb, 72);  // picture aspect ratio is unreliable
yading@11:     ff_get_bmp_header(pb, st, NULL);
yading@11: 
yading@11:     return 72 + 40;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Parse MPEG1WAVEFORMATEX extradata structure
yading@11:  */
yading@11: static void parse_mpeg1waveformatex(AVStream *st)
yading@11: {
yading@11:     /* fwHeadLayer */
yading@11:     switch (AV_RL16(st->codec->extradata)) {
yading@11:     case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
yading@11:     case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
yading@11:     case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
yading@11:     }
yading@11: 
yading@11:     st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
yading@11: 
yading@11:     /* dwHeadMode */
yading@11:     switch (AV_RL16(st->codec->extradata + 6)) {
yading@11:     case 1 :
yading@11:     case 2 :
yading@11:     case 4 : st->codec->channels       = 2;
yading@11:              st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:              break;
yading@11:     case 8 : st->codec->channels       = 1;
yading@11:              st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:              break;
yading@11:     }
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Initialise stream
yading@11:  * @param st Stream to initialise, or NULL to create and initialise new stream
yading@11:  * @return NULL on error
yading@11:  */
yading@11: static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
yading@11: {
yading@11:     if (st) {
yading@11:         if (st->codec->extradata) {
yading@11:             av_freep(&st->codec->extradata);
yading@11:             st->codec->extradata_size = 0;
yading@11:         }
yading@11:     } else {
yading@11:         WtvStream *wst = av_mallocz(sizeof(WtvStream));
yading@11:         if (!wst)
yading@11:             return NULL;
yading@11:         st = avformat_new_stream(s, NULL);
yading@11:         if (!st) {
yading@11:             av_free(wst);
yading@11:             return NULL;
yading@11:         }
yading@11:         st->id = sid;
yading@11:         st->priv_data = wst;
yading@11:     }
yading@11:     st->codec->codec_type = codec_type;
yading@11:     st->need_parsing      = AVSTREAM_PARSE_FULL;
yading@11:     avpriv_set_pts_info(st, 64, 1, 10000000);
yading@11:     return st;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * parse Media Type structure and populate stream
yading@11:  * @param st         Stream, or NULL to create new stream
yading@11:  * @param mediatype  Mediatype GUID
yading@11:  * @param subtype    Subtype GUID
yading@11:  * @param formattype Format GUID
yading@11:  * @param size       Size of format buffer
yading@11:  * @return NULL on error
yading@11:  */
yading@11: static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
yading@11:                                    ff_asf_guid mediatype, ff_asf_guid subtype,
yading@11:                                    ff_asf_guid formattype, int size)
yading@11: {
yading@11:     WtvContext *wtv = s->priv_data;
yading@11:     AVIOContext *pb = wtv->pb;
yading@11:     if (!ff_guidcmp(subtype, ff_mediasubtype_cpfilters_processed) &&
yading@11:         !ff_guidcmp(formattype, ff_format_cpfilters_processed)) {
yading@11:         ff_asf_guid actual_subtype;
yading@11:         ff_asf_guid actual_formattype;
yading@11: 
yading@11:         if (size < 32) {
yading@11:             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
yading@11:             avio_skip(pb, size);
yading@11:             return NULL;
yading@11:         }
yading@11: 
yading@11:         avio_skip(pb, size - 32);
yading@11:         ff_get_guid(pb, &actual_subtype);
yading@11:         ff_get_guid(pb, &actual_formattype);
yading@11:         avio_seek(pb, -size, SEEK_CUR);
yading@11: 
yading@11:         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
yading@11:         avio_skip(pb, 32);
yading@11:         return st;
yading@11:     } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
yading@11:         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
yading@11:         if (!st)
yading@11:             return NULL;
yading@11:         if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
yading@11:             int ret = ff_get_wav_header(pb, st->codec, size);
yading@11:             if (ret < 0)
yading@11:                 return NULL;
yading@11:         } else {
yading@11:             if (ff_guidcmp(formattype, ff_format_none))
yading@11:                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
yading@11:             avio_skip(pb, size);
yading@11:         }
yading@11: 
yading@11:         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
yading@11:             st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
yading@11:         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
yading@11:             if (st->codec->extradata && st->codec->extradata_size >= 22)
yading@11:                 parse_mpeg1waveformatex(st);
yading@11:             else
yading@11:                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
yading@11:         } else {
yading@11:             st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
yading@11:             if (st->codec->codec_id == AV_CODEC_ID_NONE)
yading@11:                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
yading@11:         }
yading@11:         return st;
yading@11:     } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
yading@11:         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
yading@11:         if (!st)
yading@11:             return NULL;
yading@11:         if (!ff_guidcmp(formattype, format_videoinfo2)) {
yading@11:             int consumed = parse_videoinfoheader2(s, st);
yading@11:             avio_skip(pb, FFMAX(size - consumed, 0));
yading@11:         } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
yading@11:             int consumed = parse_videoinfoheader2(s, st);
yading@11:             avio_skip(pb, FFMAX(size - consumed, 0));
yading@11:         } else {
yading@11:             if (ff_guidcmp(formattype, ff_format_none))
yading@11:                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
yading@11:             avio_skip(pb, size);
yading@11:         }
yading@11: 
yading@11:         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
yading@11:             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
yading@11:         } else {
yading@11:             st->codec->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
yading@11:         }
yading@11:         if (st->codec->codec_id == AV_CODEC_ID_NONE)
yading@11:             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
yading@11:         return st;
yading@11:     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
yading@11:                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
yading@11:         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
yading@11:         if (!st)
yading@11:             return NULL;
yading@11:         if (ff_guidcmp(formattype, ff_format_none))
yading@11:             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
yading@11:         avio_skip(pb, size);
yading@11:         st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
yading@11:         return st;
yading@11:     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
yading@11:                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
yading@11:         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
yading@11:         if (!st)
yading@11:             return NULL;
yading@11:         if (ff_guidcmp(formattype, ff_format_none))
yading@11:             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
yading@11:         avio_skip(pb, size);
yading@11:         st->codec->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608;
yading@11:         return st;
yading@11:     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
yading@11:                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
yading@11:         if (ff_guidcmp(formattype, ff_format_none))
yading@11:             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
yading@11:         avio_skip(pb, size);
yading@11:         return NULL;
yading@11:     }
yading@11: 
yading@11:     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
yading@11:                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
yading@11:                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
yading@11:     avio_skip(pb, size);
yading@11:     return NULL;
yading@11: }
yading@11: 
yading@11: enum {
yading@11:     SEEK_TO_DATA = 0,
yading@11:     SEEK_TO_PTS,
yading@11: };
yading@11: 
yading@11: /**
yading@11:  * Parse WTV chunks
yading@11:  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
yading@11:  * @param seekts timestamp
yading@11:  * @param[out] len_ptr Length of data chunk
yading@11:  * @return stream index of data chunk, or <0 on error
yading@11:  */
yading@11: static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
yading@11: {
yading@11:     WtvContext *wtv = s->priv_data;
yading@11:     AVIOContext *pb = wtv->pb;
yading@11:     while (!url_feof(pb)) {
yading@11:         ff_asf_guid g;
yading@11:         int len, sid, consumed;
yading@11: 
yading@11:         ff_get_guid(pb, &g);
yading@11:         len = avio_rl32(pb);
yading@11:         if (len < 32)
yading@11:             break;
yading@11:         sid = avio_rl32(pb) & 0x7FFF;
yading@11:         avio_skip(pb, 8);
yading@11:         consumed = 32;
yading@11: 
yading@11:         if (!ff_guidcmp(g, ff_SBE2_STREAM_DESC_EVENT)) {
yading@11:             if (ff_find_stream_index(s, sid) < 0) {
yading@11:                 ff_asf_guid mediatype, subtype, formattype;
yading@11:                 int size;
yading@11:                 avio_skip(pb, 28);
yading@11:                 ff_get_guid(pb, &mediatype);
yading@11:                 ff_get_guid(pb, &subtype);
yading@11:                 avio_skip(pb, 12);
yading@11:                 ff_get_guid(pb, &formattype);
yading@11:                 size = avio_rl32(pb);
yading@11:                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
yading@11:                 consumed += 92 + size;
yading@11:             }
yading@11:         } else if (!ff_guidcmp(g, ff_stream2_guid)) {
yading@11:             int stream_index = ff_find_stream_index(s, sid);
yading@11:             if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
yading@11:                 ff_asf_guid mediatype, subtype, formattype;
yading@11:                 int size;
yading@11:                 avio_skip(pb, 12);
yading@11:                 ff_get_guid(pb, &mediatype);
yading@11:                 ff_get_guid(pb, &subtype);
yading@11:                 avio_skip(pb, 12);
yading@11:                 ff_get_guid(pb, &formattype);
yading@11:                 size = avio_rl32(pb);
yading@11:                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
yading@11:                 consumed += 76 + size;
yading@11:             }
yading@11:         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
yading@11:                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
yading@11:                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
yading@11:                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
yading@11:                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
yading@11:                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
yading@11:             int stream_index = ff_find_stream_index(s, sid);
yading@11:             if (stream_index >= 0) {
yading@11:                 AVStream *st = s->streams[stream_index];
yading@11:                 uint8_t buf[258];
yading@11:                 const uint8_t *pbuf = buf;
yading@11:                 int buf_size;
yading@11: 
yading@11:                 avio_skip(pb, 8);
yading@11:                 consumed += 8;
yading@11:                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
yading@11:                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
yading@11:                     avio_skip(pb, 6);
yading@11:                     consumed += 6;
yading@11:                 }
yading@11: 
yading@11:                 buf_size = FFMIN(len - consumed, sizeof(buf));
yading@11:                 avio_read(pb, buf, buf_size);
yading@11:                 consumed += buf_size;
yading@11:                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
yading@11:             }
yading@11:         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
yading@11:             int stream_index = ff_find_stream_index(s, sid);
yading@11:             if (stream_index >= 0) {
yading@11:                 AVStream *st = s->streams[stream_index];
yading@11:                 int audio_type;
yading@11:                 avio_skip(pb, 8);
yading@11:                 audio_type = avio_r8(pb);
yading@11:                 if (audio_type == 2)
yading@11:                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
yading@11:                 else if (audio_type == 3)
yading@11:                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
yading@11:                 consumed += 9;
yading@11:             }
yading@11:         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
yading@11:             int stream_index = ff_find_stream_index(s, sid);
yading@11:             if (stream_index >= 0) {
yading@11:                 avio_skip(pb, 12);
yading@11:                 if (avio_rl32(pb))
yading@11:                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
yading@11:                 consumed += 16;
yading@11:             }
yading@11:         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
yading@11:             int stream_index = ff_find_stream_index(s, sid);
yading@11:             if (stream_index >= 0) {
yading@11:                 AVStream *st = s->streams[stream_index];
yading@11:                 uint8_t language[4];
yading@11:                 avio_skip(pb, 12);
yading@11:                 avio_read(pb, language, 3);
yading@11:                 if (language[0]) {
yading@11:                     language[3] = 0;
yading@11:                     av_dict_set(&st->metadata, "language", language, 0);
yading@11:                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
yading@11:                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
yading@11:                 }
yading@11:                 consumed += 15;
yading@11:             }
yading@11:         } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
yading@11:             int stream_index = ff_find_stream_index(s, sid);
yading@11:             if (stream_index >= 0) {
yading@11:                 avio_skip(pb, 8);
yading@11:                 wtv->pts = avio_rl64(pb);
yading@11:                 consumed += 16;
yading@11:                 if (wtv->pts == -1)
yading@11:                     wtv->pts = AV_NOPTS_VALUE;
yading@11:                 else {
yading@11:                     wtv->last_valid_pts = wtv->pts;
yading@11:                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
yading@11:                         wtv->epoch = wtv->pts;
yading@11:                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
yading@11:                     avio_skip(pb, WTV_PAD8(len) - consumed);
yading@11:                     return 0;
yading@11:                 }
yading@11:                 }
yading@11:             }
yading@11:         } else if (!ff_guidcmp(g, ff_data_guid)) {
yading@11:             int stream_index = ff_find_stream_index(s, sid);
yading@11:             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
yading@11:                 WtvStream *wst = s->streams[stream_index]->priv_data;
yading@11:                 wst->seen_data = 1;
yading@11:                 if (len_ptr) {
yading@11:                     *len_ptr = len;
yading@11:                 }
yading@11:                 return stream_index;
yading@11:             }
yading@11:         } else if (!ff_guidcmp(g, /* DSATTRIB_WMDRMProtectionInfo */ (const ff_asf_guid){0x83,0x95,0x74,0x40,0x9D,0x6B,0xEC,0x4E,0xB4,0x3C,0x67,0xA1,0x80,0x1E,0x1A,0x9B})) {
yading@11:             int stream_index = ff_find_stream_index(s, sid);
yading@11:             if (stream_index >= 0)
yading@11:                 av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
yading@11:         } else if (
yading@11:             !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}) ||
yading@11:             !ff_guidcmp(g, /* DSATTRIB_PBDATAG_ATTRIBUTE */ (const ff_asf_guid){0x79,0x66,0xB5,0xE0,0xB9,0x12,0xCC,0x43,0xB7,0xDF,0x57,0x8C,0xAA,0x5A,0x7B,0x63}) ||
yading@11:             !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}) ||
yading@11:             !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
yading@11:             !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}) ||
yading@11:             !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}) ||
yading@11:             !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}) ||
yading@11:             !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}) ||
yading@11:             !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}) ||
yading@11:             !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}) ||
yading@11:             !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}) ||
yading@11:             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
yading@11:             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
yading@11:             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
yading@11:             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
yading@11:             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
yading@11:             !ff_guidcmp(g, ff_index_guid) ||
yading@11:             !ff_guidcmp(g, ff_sync_guid) ||
yading@11:             !ff_guidcmp(g, ff_stream1_guid) ||
yading@11:             !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
yading@11:             //ignore known guids
yading@11:         } else
yading@11:             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
yading@11: 
yading@11:         avio_skip(pb, WTV_PAD8(len) - consumed);
yading@11:     }
yading@11:     return AVERROR_EOF;
yading@11: }
yading@11: 
yading@11: static int read_header(AVFormatContext *s)
yading@11: {
yading@11:     WtvContext *wtv = s->priv_data;
yading@11:     int root_sector, root_size;
yading@11:     uint8_t root[WTV_SECTOR_SIZE];
yading@11:     AVIOContext *pb;
yading@11:     int64_t timeline_pos;
yading@11:     int ret;
yading@11: 
yading@11:     wtv->epoch          =
yading@11:     wtv->pts            =
yading@11:     wtv->last_valid_pts = AV_NOPTS_VALUE;
yading@11: 
yading@11:     /* read root directory sector */
yading@11:     avio_skip(s->pb, 0x30);
yading@11:     root_size = avio_rl32(s->pb);
yading@11:     if (root_size > sizeof(root)) {
yading@11:         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11:     avio_skip(s->pb, 4);
yading@11:     root_sector = avio_rl32(s->pb);
yading@11: 
yading@11:     avio_seek(s->pb, (int64_t)root_sector << WTV_SECTOR_BITS, SEEK_SET);
yading@11:     root_size = avio_read(s->pb, root, root_size);
yading@11:     if (root_size < 0)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     /* parse chunks up until first data chunk */
yading@11:     wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
yading@11:     if (!wtv->pb) {
yading@11:         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11:     avio_seek(wtv->pb, -32, SEEK_CUR);
yading@11: 
yading@11:     timeline_pos = avio_tell(s->pb); // save before opening another file
yading@11: 
yading@11:     /* read metadata */
yading@11:     pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
yading@11:     if (pb) {
yading@11:         parse_legacy_attrib(s, pb);
yading@11:         wtvfile_close(pb);
yading@11:     }
yading@11: 
yading@11:     /* read seek index */
yading@11:     if (s->nb_streams) {
yading@11:         AVStream *st = s->streams[0];
yading@11:         pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
yading@11:         if (pb) {
yading@11:             while(1) {
yading@11:                 uint64_t timestamp = avio_rl64(pb);
yading@11:                 uint64_t frame_nb  = avio_rl64(pb);
yading@11:                 if (url_feof(pb))
yading@11:                     break;
yading@11:                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
yading@11:                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
yading@11:             }
yading@11:             wtvfile_close(pb);
yading@11: 
yading@11:             if (wtv->nb_index_entries) {
yading@11:                 pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
yading@11:                 if (pb) {
yading@11:                     int i;
yading@11:                     while (1) {
yading@11:                         uint64_t frame_nb = avio_rl64(pb);
yading@11:                         uint64_t position = avio_rl64(pb);
yading@11:                         if (url_feof(pb))
yading@11:                             break;
yading@11:                         for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
yading@11:                             AVIndexEntry *e = wtv->index_entries + i;
yading@11:                             if (frame_nb > e->size)
yading@11:                                 break;
yading@11:                             if (position > e->pos)
yading@11:                                 e->pos = position;
yading@11:                         }
yading@11:                     }
yading@11:                     wtvfile_close(pb);
yading@11:                     st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
yading@11:                 }
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     avio_seek(s->pb, timeline_pos, SEEK_SET);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     WtvContext *wtv = s->priv_data;
yading@11:     AVIOContext *pb = wtv->pb;
yading@11:     int stream_index, len, ret;
yading@11: 
yading@11:     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
yading@11:     if (stream_index < 0)
yading@11:         return stream_index;
yading@11: 
yading@11:     ret = av_get_packet(pb, pkt, len - 32);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11:     pkt->stream_index = stream_index;
yading@11:     pkt->pts          = wtv->pts;
yading@11:     avio_skip(pb, WTV_PAD8(len) - len);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_seek(AVFormatContext *s, int stream_index,
yading@11:                      int64_t ts, int flags)
yading@11: {
yading@11:     WtvContext *wtv = s->priv_data;
yading@11:     AVIOContext *pb = wtv->pb;
yading@11:     AVStream *st = s->streams[0];
yading@11:     int64_t ts_relative;
yading@11:     int i;
yading@11: 
yading@11:     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
yading@11:         return AVERROR(ENOSYS);
yading@11: 
yading@11:     /* timestamp adjustment is required because wtv->pts values are absolute,
yading@11:      * whereas AVIndexEntry->timestamp values are relative to epoch. */
yading@11:     ts_relative = ts;
yading@11:     if (wtv->epoch != AV_NOPTS_VALUE)
yading@11:         ts_relative -= wtv->epoch;
yading@11: 
yading@11:     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
yading@11:     if (i < 0) {
yading@11:         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
yading@11:             if (avio_seek(pb, 0, SEEK_SET) < 0)
yading@11:                 return -1;
yading@11:         } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
yading@11:             if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
yading@11:                 return -1;
yading@11:         }
yading@11:         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
yading@11:             return AVERROR(ERANGE);
yading@11:         return 0;
yading@11:     }
yading@11:     if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
yading@11:         return -1;
yading@11:     wtv->pts = wtv->index_entries[i].timestamp;
yading@11:     if (wtv->epoch != AV_NOPTS_VALUE)
yading@11:         wtv->pts += wtv->epoch;
yading@11:     wtv->last_valid_pts = wtv->pts;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_close(AVFormatContext *s)
yading@11: {
yading@11:     WtvContext *wtv = s->priv_data;
yading@11:     av_freep(&wtv->index_entries);
yading@11:     wtvfile_close(wtv->pb);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_wtv_demuxer = {
yading@11:     .name           = "wtv",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
yading@11:     .priv_data_size = sizeof(WtvContext),
yading@11:     .read_probe     = read_probe,
yading@11:     .read_header    = read_header,
yading@11:     .read_packet    = read_packet,
yading@11:     .read_seek      = read_seek,
yading@11:     .read_close     = read_close,
yading@11:     .flags          = AVFMT_SHOW_IDS,
yading@11: };