PeerStreamer

/*

 * Windows Television (WTV) demuxer

 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>

 *

 * This file is part of FFmpeg.

 *

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

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

 * License as published by the Free Software Foundation; either

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

 *

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

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

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

 * Lesser General Public License for more details.

 *

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

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

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

 */

/**

 * @file

 * Windows Television (WTV) demuxer

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

 */

#include "libavutil/intreadwrite.h"

#include "libavutil/intfloat_readwrite.h"

#include "avformat.h"

#include "internal.h"

#include "wtv.h"

#include "mpegts.h"

#include <strings.h>

/* Macros for formating GUIDs */

#define PRI_PRETTY_GUID \

    "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x"

#define ARG_PRETTY_GUID(g) \

    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]

#define LEN_PRETTY_GUID 34

/*

 *

 * File system routines

 *

 */

typedef struct {

    AVIOContext *pb_filesystem;  /** file system (AVFormatContext->pb) */

    int sector_bits;     /** sector shift bits; used to convert sector number into pb_filesystem offset */

    uint32_t *sectors;   /** file allocation table */

    int nb_sectors;      /** number of sectors */

    int error;

    int64_t position;

    int64_t length;

} WtvFile;

/**

 * @return bytes read, 0 on end of file, or <0 on error

 */

static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)

{

    WtvFile *wf = opaque;

    AVIOContext *pb = wf->pb_filesystem;

    int nread = 0;

    if (wf->error || pb->error)

        return -1;

    if (wf->position >= wf->length || url_feof(pb))

        return 0;

    buf_size = FFMIN(buf_size, wf->length - wf->position);

    while(nread < buf_size) {

        int n;

        int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));

        int read_request        = FFMIN(buf_size - nread, remaining_in_sector);

        n = avio_read(pb, buf, read_request);

        if (n <= 0)

            break;

        nread += n;

        buf += n;

        wf->position += n;

        if (n == remaining_in_sector) {

            int i = wf->position >> wf->sector_bits;

            if (i >= wf->nb_sectors ||

                (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&

                avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {

                wf->error = 1;

                break;

            }

        }

    }

    return nread;

}

/**

 * @return position (or file length)

 */

static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)

{

    WtvFile *wf = opaque;

    AVIOContext *pb = wf->pb_filesystem;

    if (whence == AVSEEK_SIZE)

        return wf->length;

    else if (whence == SEEK_CUR)

        offset = wf->position + offset;

    else if (whence == SEEK_END)

        offset = wf->length;

    wf->error = offset < 0 || offset >= wf->length ||

                avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)

                              + (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 0;

    wf->position = offset;

    return offset;

}

/**

 * read non-zero integers (le32) from input stream

 * @param pb

 * @param[out] data destination

 * @param     count maximum number of integers to read

 * @return    total number of integers read

 */

static int read_ints(AVIOContext *pb, uint32_t *data, int count)

{

    int i, total = 0;

    for (i = 0; i < count; i++) {

        if ((data[total] = avio_rl32(pb)))

           total++;

    }

    return total;

}

/**

 * Open file

 * @param first_sector  First sector

 * @param length        Length of file (bytes)

 * @param depth         File allocation table depth

 * @return NULL on error

 */

static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)

{

    AVIOContext *pb;

    WtvFile *wf;

    uint8_t *buffer;

    if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 0)

        return NULL;

    wf = av_mallocz(sizeof(WtvFile));

    if (!wf)

        return NULL;

    if (depth == 0) {

        wf->sectors = av_malloc(sizeof(uint32_t));

        if (!wf->sectors) {

            av_free(wf);

            return NULL;

        }

        wf->sectors[0]  = first_sector;

        wf->nb_sectors  = 1;

        wf->sector_bits = WTV_SECTOR_BITS;

    } else if (depth == 1) {

        wf->sectors = av_malloc(WTV_SECTOR_SIZE);

        if (!wf->sectors) {

            av_free(wf);

            return NULL;

        }

        wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);

        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;

    } else if (depth == 2) {

        uint32_t sectors1[WTV_SECTOR_SIZE / 4];

        int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);

        int i;

        wf->sectors = av_malloc(nb_sectors1 << WTV_SECTOR_BITS);

        if (!wf->sectors) {

            av_free(wf);

            return NULL;

        }

        wf->nb_sectors = 0;

        for (i = 0; i < nb_sectors1; i++) {

            if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)

                break;

            wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);

        }

        wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;

    } else {

        av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);

        av_free(wf);

        return NULL;

    }

    if (!wf->nb_sectors) {

        av_free(wf->sectors);

        av_free(wf);

        return NULL;

    }

    /* check length */

    length &= 0xFFFFFFFFFFFF;

    if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {

        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);

        length = (int64_t)wf->nb_sectors <<  wf->sector_bits;

    }

    wf->length = length;

    /* seek to intial sector */

    wf->position = 0;

    if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {

        av_free(wf->sectors);

        av_free(wf);

        return NULL;

    }

    wf->pb_filesystem = s->pb;

    buffer = av_malloc(1 << wf->sector_bits);

    if (!buffer) {

        av_free(wf->sectors);

        av_free(wf);

        return NULL;

    }

    pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,

                           wtvfile_read_packet, NULL, wtvfile_seek);

    if (!pb) {

        av_free(buffer);

        av_free(wf->sectors);

        av_free(wf);

    }

    return pb;

}

/**

 * Open file using filename

 * @param[in]  buf       directory buffer

 * @param      buf_size  directory buffer size

 * @param[in]  filename

 * @param      filename_size size of filename

 * @return NULL on error

 */

static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)

{

    const uint8_t *buf_end = buf + buf_size;

    while(buf + 48 <= buf_end) {

        int dir_length, name_size, first_sector, depth;

        uint64_t file_length;

        const uint8_t *name;

        if (ff_guidcmp(buf, ff_dir_entry_guid)) {

            av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "

                   "remaining directory entries ignored\n", FF_ARG_GUID(buf));

            break;

        }

        dir_length  = AV_RL16(buf + 16);

        file_length = AV_RL64(buf + 24);

        name_size   = 2 * AV_RL32(buf + 32);

        if (buf + 48 + name_size > buf_end) {

            av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");

            break;

        }

        first_sector = AV_RL32(buf + 40 + name_size);

        depth        = AV_RL32(buf + 44 + name_size);

        /* compare file name; test optional null terminator */

        name = buf + 40;

        if (name_size >= filename_size &&

            !memcmp(name, filename, filename_size) &&

            (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))

            return wtvfile_open_sector(first_sector, file_length, depth, s);

        buf += dir_length;

    }

    return 0;

}

#define wtvfile_open(s, buf, buf_size, filename) \

    wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))

/**

 * Close file opened with wtvfile_open_sector(), or wtv_open()

 */

static void wtvfile_close(AVIOContext *pb)

{

    WtvFile *wf = pb->opaque;

    av_free(wf->sectors);

    av_free(pb);

}

/*

 *

 * Main demuxer

 *

 */

typedef struct {

    int seen_data;

} WtvStream;

typedef struct {

    AVIOContext *pb;       /** timeline file */

    int64_t epoch;

    int64_t pts;             /** pts for next data chunk */

    int64_t last_valid_pts;  /** latest valid pts, used for interative seeking */

    /* maintain private seek index, as the AVIndexEntry->pos is relative to the

       start of the 'timeline' file, not the file system (AVFormatContext->pb) */

    AVIndexEntry *index_entries;

    int nb_index_entries;

    unsigned int index_entries_allocated_size;

} WtvContext;

/* WTV GUIDs */

static const ff_asf_guid metadata_guid =

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

static const ff_asf_guid stream2_guid =

    {0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};

static const ff_asf_guid EVENTID_SubtitleSpanningEvent =

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

static const ff_asf_guid EVENTID_LanguageSpanningEvent =

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

static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =

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

static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =

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

static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =

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

static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =

    {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};

static const ff_asf_guid EVENTID_StreamIDSpanningEvent =

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

static const ff_asf_guid EVENTID_TeletextSpanningEvent =

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

static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =

    {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};

/* Windows media GUIDs */

/* Media types */

static const ff_asf_guid mediasubtype_mpeg1payload =

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

static const ff_asf_guid mediatype_mpeg2_sections =

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

static const ff_asf_guid mediatype_mpeg2_pes =

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

static const ff_asf_guid mediatype_mstvcaption =

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

/* Media subtypes */

static const ff_asf_guid mediasubtype_cpfilters_processed =

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

static const ff_asf_guid mediasubtype_dvb_subtitle =

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

static const ff_asf_guid mediasubtype_teletext =

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

static const ff_asf_guid mediasubtype_dtvccdata =

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

static const ff_asf_guid mediasubtype_mpeg2_sections =

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

/* Formats */

static const ff_asf_guid format_cpfilters_processed =

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

static const ff_asf_guid format_waveformatex =

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

static const ff_asf_guid format_videoinfo2 =

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

static const ff_asf_guid format_mpeg2_video =

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

static int read_probe(AVProbeData *p)

{

    return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;

}

/**

 * Convert win32 FILETIME to ISO-8601 string

 */

static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)

{

    time_t t = (value / 10000000LL) - 11644473600LL;

    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));

}

/**

 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string

 */

static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)

{

    time_t t = (value / 10000000LL) - 719162LL*86400LL;

    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));

}

/**

 * Convert OLE DATE to ISO-8601 string

 * @return <0 on error

 */

static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)

{

    time_t t = 631112400LL + 86400*av_int2dbl(value);

    struct tm result;

    if (!gmtime_r(&t, &result))

        return -1;

    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", &result);

    return 0;

}

static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)

{

    char mime[1024];

    char description[1024];

    unsigned int filesize;

    AVStream *st;

    int64_t pos = avio_tell(pb);

    avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));

    if (strcmp(mime, "image/jpeg"))

        goto done;

    avio_r8(pb);

    avio_get_str16le(pb, INT_MAX, description, sizeof(description));

    filesize = avio_rl32(pb);

    if (!filesize)

        goto done;

    st = av_new_stream(s, 0);

    if (!st)

        goto done;

    av_metadata_set2(&st->metadata, "title", description, 0);

    st->codec->codec_id   = CODEC_ID_MJPEG;

    st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;

    st->codec->extradata  = av_mallocz(filesize);

    if (!st->codec->extradata)

        goto done;

    st->codec->extradata_size = filesize;

    avio_read(pb, st->codec->extradata, filesize);

done:

    avio_seek(pb, pos + length, SEEK_SET);

}

static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)

{

    int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;

    char *buf = av_malloc(buf_size);

    if (!buf)

        return;

    if (type == 0 && length == 4) {

        snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));

    } else if (type == 1) {

        avio_get_str16le(pb, length, buf, buf_size);

        if (!strlen(buf)) {

           av_free(buf);

           return;

        }

    } else if (type == 3 && length == 4) {

        strcpy(buf, avio_rl32(pb) ? "true" : "false");

    } else if (type == 4 && length == 8) {

        int64_t num = avio_rl64(pb);

        if (!strcmp(key, "WM/EncodingTime") ||

            !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))

            filetime_to_iso8601(buf, buf_size, num);

        else if (!strcmp(key, "WM/WMRVEncodeTime") ||

                 !strcmp(key, "WM/WMRVEndTime"))

            crazytime_to_iso8601(buf, buf_size, num);

        else if (!strcmp(key, "WM/WMRVExpirationDate")) {

            if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {

                av_free(buf);

                return;

            }

        } else if (!strcmp(key, "WM/WMRVBitrate"))

            snprintf(buf, buf_size, "%f", av_int2dbl(num));

        else

            snprintf(buf, buf_size, "%"PRIi64, num);

    } else if (type == 5 && length == 2) {

        snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));

    } else if (type == 6 && length == 16) {

        ff_asf_guid guid;

        avio_read(pb, guid, 16);

        snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));

    } else if (type == 2 && !strcmp(key, "WM/Picture")) {

        get_attachment(s, pb, length);

        av_freep(&buf);

        return;

    } else {

        av_freep(&buf);

        av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);

        avio_skip(pb, length);

        return;

    }

    av_metadata_set2(&s->metadata, key, buf, 0);

    av_freep(&buf);

}

/**

 * Parse metadata entries

 */

static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)

{

    ff_asf_guid guid;

    int length, type;

    while(!url_feof(pb)) {

        char key[1024];

        ff_get_guid(pb, &guid);

        type   = avio_rl32(pb);

        length = avio_rl32(pb);

        if (!length)

            break;

        if (ff_guidcmp(&guid, metadata_guid)) {

            av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "

                   "remaining metadata entries ignored\n", FF_ARG_GUID(guid));

            break;

        }

        avio_get_str16le(pb, INT_MAX, key, sizeof(key));

        get_tag(s, pb, key, type, length);

    }

    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);

}

/**

 * parse VIDEOINFOHEADER2 structure

 * @return bytes consumed

 */

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

{

    WtvContext *wtv = s->priv_data;

    AVIOContext *pb = wtv->pb;

    avio_skip(pb, 72);  // picture aspect ratio is unreliable

    ff_get_bmp_header(pb, st);

    return 72 + 40;

}

/**

 * Parse MPEG1WAVEFORMATEX extradata structure

 */

static void parse_mpeg1waveformatex(AVStream *st)

{

    /* fwHeadLayer */

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

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

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

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

    }

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

    /* dwHeadMode */

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

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

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

    }

}

/**

 * Initialise stream

 * @param st Stream to initialise, or NULL to create and initialise new stream

 * @return NULL on error

 */

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

{

    if (st) {

        if (st->codec->extradata) {

            av_freep(&st->codec->extradata);

            st->codec->extradata_size = 0;

        }

    } else {

        WtvStream *wst = av_mallocz(sizeof(WtvStream));

        if (!wst)

            return NULL;

        st = av_new_stream(s, sid);

        if (!st)

            return NULL;

        st->priv_data = wst;

    }

    st->codec->codec_type = codec_type;

    st->need_parsing      = AVSTREAM_PARSE_FULL;

    av_set_pts_info(st, 64, 1, 10000000);

    return st;

}

/**

 * parse Media Type structure and populate stream

 * @param st         Stream, or NULL to create new stream

 * @param mediatype  Mediatype GUID

 * @param subtype    Subtype GUID

 * @param formattype Format GUID

 * @param size       Size of format buffer

 * @return NULL on error

 */

static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,

                                   ff_asf_guid mediatype, ff_asf_guid subtype,

                                   ff_asf_guid formattype, int size)

{

    WtvContext *wtv = s->priv_data;

    AVIOContext *pb = wtv->pb;

    if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&

        !ff_guidcmp(formattype, format_cpfilters_processed)) {

        ff_asf_guid actual_subtype;

        ff_asf_guid actual_formattype;

        if (size < 32) {

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

            avio_skip(pb, size);

            return NULL;

        }

        avio_skip(pb, size - 32);

        ff_get_guid(pb, &actual_subtype);

        ff_get_guid(pb, &actual_formattype);

        avio_seek(pb, -size, SEEK_CUR);

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

        avio_skip(pb, 32);

        return st;

    } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {

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

        if (!st)

            return NULL;

        if (!ff_guidcmp(formattype, format_waveformatex)) {

            int ret = ff_get_wav_header(pb, st->codec, size);

            if (ret < 0)

                return NULL;

        } else {

            if (ff_guidcmp(formattype, ff_format_none))

                av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

            avio_skip(pb, size);

        }

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

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

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

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

                parse_mpeg1waveformatex(st);

            else

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

        } else {

            st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);

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

                av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));

        }

        return st;

    } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {

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

        if (!st)

            return NULL;

        if (!ff_guidcmp(formattype, format_videoinfo2)) {

            int consumed = parse_videoinfoheader2(s, st);

            avio_skip(pb, FFMAX(size - consumed, 0));

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

            int consumed = parse_videoinfoheader2(s, st);

            avio_skip(pb, FFMAX(size - consumed, 0));

        } else {

            if (ff_guidcmp(formattype, ff_format_none))

                av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

            avio_skip(pb, size);

        }

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

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

        } else {

            st->codec->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);

        }

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

            av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));

        return st;

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

               !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {

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

        if (!st)

            return NULL;

        if (ff_guidcmp(formattype, ff_format_none))

            av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

        avio_skip(pb, size);

        st->codec->codec_id = CODEC_ID_DVB_SUBTITLE;

        return st;

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

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

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

        if (!st)

            return NULL;

        if (ff_guidcmp(formattype, ff_format_none))

            av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

        avio_skip(pb, size);

        st->codec->codec_id   = CODEC_ID_DVB_TELETEXT;

        return st;

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

               !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {

        if (ff_guidcmp(formattype, ff_format_none))

            av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));

        avio_skip(pb, size);

        return NULL;

    }

    av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID

                              ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",

                              FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));

    avio_skip(pb, size);

    return NULL;

}

enum {

    SEEK_TO_DATA = 0,

    SEEK_TO_PTS,

};

/**

 * Parse WTV chunks

 * @param mode SEEK_TO_DATA or SEEK_TO_PTS

 * @param seekts timestamp

 * @param[out] len Length of data chunk

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

 */

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

{

    WtvContext *wtv = s->priv_data;

    AVIOContext *pb = wtv->pb;

    while (!url_feof(pb)) {

        ff_asf_guid g;

        int len, sid, consumed;

        ff_get_guid(pb, &g);

        len = avio_rl32(pb);

        if (len < 32)

            break;

        sid = avio_rl32(pb) & 0x7FFF;

        avio_skip(pb, 8);

        consumed = 32;

        if (!ff_guidcmp(g, ff_stream_guid)) {

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

                ff_asf_guid mediatype, subtype, formattype;

                int size;

                avio_skip(pb, 28);

                ff_get_guid(pb, &mediatype);

                ff_get_guid(pb, &subtype);

                avio_skip(pb, 12);

                ff_get_guid(pb, &formattype);

                size = avio_rl32(pb);

                parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);

                consumed += 92 + size;

            }

        } else if (!ff_guidcmp(g, stream2_guid)) {

            int stream_index = ff_find_stream_index(s, sid);

            if (stream_index >= 0 && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {

                ff_asf_guid mediatype, subtype, formattype;

                int size;

                avio_skip(pb, 12);

                ff_get_guid(pb, &mediatype);

                ff_get_guid(pb, &subtype);

                avio_skip(pb, 12);

                ff_get_guid(pb, &formattype);

                size = avio_rl32(pb);

                parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);

                consumed += 76 + size;

            }

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

                   !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

                   !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||

                   !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||

                   !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||

                   !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {

            int stream_index = ff_find_stream_index(s, sid);

            if (stream_index >= 0) {

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

                uint8_t buf[258];

                const uint8_t *pbuf = buf;

                int buf_size;

                avio_skip(pb, 8);

                consumed += 8;

                if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||

                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {

                    avio_skip(pb, 6);

                    consumed += 6;

                }

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

                avio_read(pb, buf, buf_size);

                consumed += buf_size;

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

            }

        } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {

            int stream_index = ff_find_stream_index(s, sid);

            if (stream_index >= 0) {

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

                int audio_type;

                avio_skip(pb, 8);

                audio_type = avio_r8(pb);

                if (audio_type == 2)

                    st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

                else if (audio_type == 3)

                    st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

                consumed += 9;

            }

        } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {

            int stream_index = ff_find_stream_index(s, sid);

            if (stream_index >= 0) {

                avio_skip(pb, 12);

                if (avio_rl32(pb))

                    av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);

                consumed += 16;

            }

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

            int stream_index = ff_find_stream_index(s, sid);

            if (stream_index >= 0) {

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

                uint8_t language[4];

                avio_skip(pb, 12);

                avio_read(pb, language, 3);

                if (language[0]) {

                    language[3] = 0;

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

                    if (!strcmp(language, "nar") || !strcmp(language, "NAR"))

                        st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

                }

                consumed += 15;

            }

        } else if (!ff_guidcmp(g, ff_timestamp_guid)) {

            int stream_index = ff_find_stream_index(s, sid);

            if (stream_index >= 0) {

                avio_skip(pb, 8);

                wtv->pts = avio_rl64(pb);

                consumed += 16;

                if (wtv->pts == -1)

                    wtv->pts = AV_NOPTS_VALUE;

                else {

                    wtv->last_valid_pts = wtv->pts;

                    if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)

                        wtv->epoch = wtv->pts;

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

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

                    avio_skip(pb, WTV_PAD8(len) - consumed);

                    return 0;

                }

                }

            }

        } else if (!ff_guidcmp(g, ff_data_guid)) {

            int stream_index = ff_find_stream_index(s, sid);

            if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {

                WtvStream *wst = s->streams[stream_index]->priv_data;

                wst->seen_data = 1;

                if (len_ptr) {

                    *len_ptr = len;

                }

                return stream_index;

            }

        } else if (

            !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}) ||

            !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}) ||

            !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}) ||

            !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}) ||

            !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}) ||

            !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}) ||

            !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}) ||

            !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}) ||

            !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}) ||

            !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}) ||

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

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

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

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

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

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

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

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

            //ignore known guids

        } else

            av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));

        avio_skip(pb, WTV_PAD8(len) - consumed);

    }

    return AVERROR_EOF;

}

/* declare utf16le strings */

#define _ , 0,

static const uint8_t timeline_le16[] =

    {'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};

static const uint8_t table_0_entries_legacy_attrib_le16[] =

    {'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};

static const uint8_t table_0_entries_time_le16[] =

    {'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};

static const uint8_t timeline_table_0_entries_Events_le16[] =

    {'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};

#undef _

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

{

    WtvContext *wtv = s->priv_data;

    int root_sector, root_size;

    uint8_t root[WTV_SECTOR_SIZE];

    AVIOContext *pb;

    int64_t timeline_pos;

    int ret;

    wtv->epoch          =

    wtv->pts            =

    wtv->last_valid_pts = AV_NOPTS_VALUE;

    /* read root directory sector */

    avio_skip(s->pb, 0x30);

    root_size = avio_rl32(s->pb);

    if (root_size > sizeof(root)) {

        av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");

        return AVERROR_INVALIDDATA;

    }

    avio_skip(s->pb, 4);

    root_sector = avio_rl32(s->pb);

    avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);

    root_size = avio_read(s->pb, root, root_size);

    if (root_size < 0)

        return AVERROR_INVALIDDATA;

    /* parse chunks up until first data chunk */

    wtv->pb = wtvfile_open(s, root, root_size, timeline_le16);

    if (!wtv->pb) {

        av_log(s, AV_LOG_ERROR, "timeline data missing\n");

        return AVERROR_INVALIDDATA;

    }

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

    if (ret < 0)

        return ret;

    avio_seek(wtv->pb, -32, SEEK_CUR);

    timeline_pos = avio_tell(s->pb); // save before opening another file

    /* read metadata */

    pb = wtvfile_open(s, root, root_size, table_0_entries_legacy_attrib_le16);

    if (pb) {

        parse_legacy_attrib(s, pb);

        wtvfile_close(pb);

    }

    /* read seek index */

    if (s->nb_streams) {

        AVStream *st = s->streams[0];

        pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);

        if (pb) {

            while(1) {

                uint64_t timestamp = avio_rl64(pb);

                uint64_t frame_nb  = avio_rl64(pb);

                if (url_feof(pb))

                    break;

                ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,

                                   0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);

            }

            wtvfile_close(pb);

            if (wtv->nb_index_entries) {

                pb = wtvfile_open(s, root, root_size, timeline_table_0_entries_Events_le16);

                if (pb) {

                    int i;

                    while (1) {

                        uint64_t frame_nb = avio_rl64(pb);

                        uint64_t position = avio_rl64(pb);

                        if (url_feof(pb))

                            break;

                        for (i = wtv->nb_index_entries - 1; i >= 0; i--) {

                            AVIndexEntry *e = wtv->index_entries + i;

                            if (frame_nb > e->size)

                                break;

                            if (position > e->pos)

                                e->pos = position;

                        }

                    }

                    wtvfile_close(pb);

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

                }

            }

        }

    }

    avio_seek(s->pb, timeline_pos, SEEK_SET);

    return 0;

}

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

{

    WtvContext *wtv = s->priv_data;

    AVIOContext *pb = wtv->pb;

    int stream_index, len, ret;

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

    if (stream_index < 0)

        return stream_index;

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

    if (ret < 0)

        return ret;

    pkt->stream_index = stream_index;

    pkt->pts          = wtv->pts;

    avio_skip(pb, WTV_PAD8(len) - len);

    return 0;

}

static int read_seek(AVFormatContext *s, int stream_index,

                     int64_t ts, int flags)

{

    WtvContext *wtv = s->priv_data;

    AVIOContext *pb = wtv->pb;

    AVStream *st = s->streams[0];

    int64_t ts_relative;

    int i;

    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))

        return AVERROR(ENOSYS);

    /* timestamp adjustment is required because wtv->pts values are absolute,

     * whereas AVIndexEntry->timestamp values are relative to epoch. */

    ts_relative = ts;

    if (wtv->epoch != AV_NOPTS_VALUE)

        ts_relative -= wtv->epoch;

    i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);

    if (i < 0) {

        if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts)

            avio_seek(pb, 0, SEEK_SET);

        else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)

            avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);

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

            return AVERROR(ERANGE);

        return 0;

    }

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

    if (wtv->epoch != AV_NOPTS_VALUE)

        wtv->pts += wtv->epoch;

    wtv->last_valid_pts = wtv->pts;

    avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);

    return 0;

}

static int read_close(AVFormatContext *s)

{

    WtvContext *wtv = s->priv_data;

    wtvfile_close(wtv->pb);

    return 0;

}

AVInputFormat ff_wtv_demuxer = {

    .name           = "wtv",

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

    .priv_data_size = sizeof(WtvContext),

    .read_probe     = read_probe,

    .read_header    = read_header,

    .read_packet    = read_packet,

    .read_seek      = read_seek,

    .read_close     = read_close,

    .flags          = AVFMT_SHOW_IDS,

};