rename wtv.c to wtvdec.c

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 1079 insertions, 0 deletions

diff --git a/libavformat/wtvdec.c b/libavformat/wtvdec.c
new file mode 100644
index 0000000000..795ea39bf9
--- /dev/null
+++ b/libavformat/wtvdec.c
@@ -0,0 +1,1079 @@
+/*
+ * 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 "riff.h"
+#include "asf.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
+ *
+ */
+
+#define WTV_SECTOR_BITS    12
+#define WTV_SECTOR_SIZE    (1 << WTV_SECTOR_BITS)
+#define WTV_BIGSECTOR_BITS 18
+
+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;
+}
+
+static const ff_asf_guid dir_entry_guid =
+    {0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
+
+/**
+ * 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, 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 wtv_guid =
+    {0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
+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 timestamp_guid =
+    {0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
+static const ff_asf_guid data_guid =
+    {0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
+static const ff_asf_guid stream_guid =
+    {0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
+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 mediatype_audio =
+    {'a','u','d','s',FF_MEDIASUBTYPE_BASE_GUID};
+static const ff_asf_guid mediatype_video =
+    {'v','i','d','s',FF_MEDIASUBTYPE_BASE_GUID};
+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 const ff_asf_guid format_none =
+    {0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
+
+static const AVCodecGuid video_guids[] = {
+    {CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
+    {CODEC_ID_NONE}
+};
+
+static int read_probe(AVProbeData *p)
+{
+    return ff_guidcmp(p->buf, 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
+ */
+static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
+{
+    time_t t = 631112400LL + 86400*av_int2dbl(value);
+    strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
+}
+
+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"))
+            oledate_to_iso8601(buf, buf_size, num);
+        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, 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, 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, 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, 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(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, 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, 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, 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, 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, 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, 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,
+};