Merge remote-tracking branch 'qatar/master'
authorMichael Niedermayer <michaelni@gmx.at>
Sat, 29 Oct 2011 00:08:54 +0000 (02:08 +0200)
committerMichael Niedermayer <michaelni@gmx.at>
Sat, 29 Oct 2011 00:08:54 +0000 (02:08 +0200)
* qatar/master: (53 commits)
  probe: Restore identification of files with very large id3 tags and no extension.
  probe: Remove id3 tag presence as a criteria to do file extension checking.
  mpegts: MP4 SL support
  mpegts: MP4 OD support
  mpegts: Add support for Sections in PMT
  mpegts: Replace the MP4 descriptor parser with a recursive parser.
  mpegts: Add support for multiple mp4 descriptors
  mpegts: Parse mpeg2 SL descriptors.
  isom: Add MPEG4SYSTEMS dummy object type indication.
  aacdec: allow output reconfiguration on channel changes
  nellymoserenc: take float input samples instead of int16
  nellymoserdec: use dsp functions for overlap and windowing
  nellymoserdec: do not fail if there is extra data in the packet
  nellymoserdec: fail if output buffer is too small
  nellymoserdec: remove pointless buffer size check.
  lavf: add init_put_byte() to the list of visible symbols.
  seek-test: free options dictionary after use
  snow: do not draw_edge if emu_edge is set
  tools/pktdumper: update to recent avformat api
  seek-test: update to recent avformat api
  ...

Conflicts:
doc/APIchanges
libavcodec/mpegaudiodec.c
libavcodec/nellymoserdec.c
libavcodec/snow.c
libavcodec/version.h
libavcodec/wmadec.c
libavformat/avformat.h
libavformat/mpegts.c
libavformat/mxfdec.c
libavformat/utils.c
libavformat/wtv.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
28 files changed:
1  2 
doc/APIchanges
libavcodec/apedec.c
libavcodec/avcodec.h
libavcodec/mpegaudiodec.c
libavcodec/mpegaudiodec_float.c
libavcodec/nellymoserdec.c
libavcodec/nellymoserenc.c
libavcodec/snow.c
libavcodec/version.h
libavcodec/wmadec.c
libavcodec/wmaprodec.c
libavcodec/wmavoice.c
libavformat/asfdec.c
libavformat/avformat.h
libavformat/internal.h
libavformat/isom.c
libavformat/isom.h
libavformat/matroskadec.c
libavformat/mpegts.c
libavformat/mpegts.h
libavformat/mxfdec.c
libavformat/nutdec.c
libavformat/oggdec.c
libavformat/seek-test.c
libavformat/utils.c
libavformat/version.h
libavformat/wtvdec.c
tools/pktdumper.c

diff --cc doc/APIchanges
@@@ -13,9 -13,10 +13,13 @@@ libavutil:   2011-04-1
  
  API changes, most recent first:
  
 +2011-10-20 - b35e9e1 - lavu 51.22.0
 +  Add av_strtok() to avstring.h.
 +
+ 2011-xx-xx - xxxxxxx - lavc 53.15.0
+   Remove avcodec_parse_frame.
+   Deprecate AVCodecContext.parse_only and CODEC_CAP_PARSE_ONLY.
  2011-10-xx - xxxxxxx - lavf 53.10.0
    Add avformat_new_stream(). Deprecate av_new_stream().
  
Simple merge
Simple merge
@@@ -1801,15 -1795,15 +1795,15 @@@ static int decode_frame(AVCodecContext 
          avctx->bit_rate = s->bit_rate;
      avctx->sub_id = s->layer;
  
-     if(*data_size < 1152*avctx->channels*sizeof(OUT_INT))
-         return -1;
+     if (*data_size < avctx->frame_size * avctx->channels * sizeof(OUT_INT))
+         return AVERROR(EINVAL);
      *data_size = 0;
  
-     if(s->frame_size<=0 || s->frame_size > buf_size){
+     if (s->frame_size <= 0 || s->frame_size > buf_size) {
          av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
-         return -1;
+         return AVERROR_INVALIDDATA;
 -    } else if (s->frame_size < buf_size) {
 -        av_log(avctx, AV_LOG_ERROR, "incorrect frame size\n");
 +    }else if(s->frame_size < buf_size){
 +        av_log(avctx, AV_LOG_DEBUG, "incorrect frame size - multiple frames in buffer?\n");
          buf_size= s->frame_size;
      }
  
Simple merge
@@@ -170,19 -154,14 +155,16 @@@ static int decode_tag(AVCodecContext * 
      int blocks, i, block_size;
      int16_t *samples_s16 = data;
      float   *samples_flt = data;
 +    *data_size = 0;
  
-     if (buf_size < avctx->block_align) {
-         return buf_size;
-     }
-     if (buf_size % NELLY_BLOCK_LEN) {
-         av_log(avctx, AV_LOG_ERROR, "Tag size %d.\n", buf_size);
-         return buf_size;
-     }
      block_size = NELLY_SAMPLES * av_get_bytes_per_sample(avctx->sample_fmt);
-     blocks     = FFMIN(buf_size / NELLY_BLOCK_LEN, data_max / block_size);
+     blocks     = buf_size / NELLY_BLOCK_LEN;
++
      if (blocks <= 0) {
 -    if (*data_size < blocks * block_size) {
+         av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
+         return AVERROR_INVALIDDATA;
+     }
++    if (data_max < blocks * block_size) {
          av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
          return AVERROR(EINVAL);
      }
Simple merge
Simple merge
@@@ -21,7 -21,7 +21,7 @@@
  #define AVCODEC_VERSION_H
  
  #define LIBAVCODEC_VERSION_MAJOR 53
- #define LIBAVCODEC_VERSION_MINOR 23
 -#define LIBAVCODEC_VERSION_MINOR 15
++#define LIBAVCODEC_VERSION_MINOR 24
  #define LIBAVCODEC_VERSION_MICRO  0
  
  #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@@@ -912,8 -902,9 +915,8 @@@ static int wma_decode_superframe(AVCode
      }
  
  //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d outbytes:%d eaten:%d\n", s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,        (int8_t *)samples - (int8_t *)data, s->block_align);
-     *data_size = (int8_t *)samples - (int8_t *)data;
 -
+     *data_size = out_size;
 -    return s->block_align;
 +    return buf_size;
   fail:
      /* when error, we reset the bit reservoir */
      s->last_superframe_len = 0;
Simple merge
@@@ -1915,16 -1928,8 +1928,8 @@@ static int wmavoice_decode_packet(AVCod
      GetBitContext *gb = &s->gb;
      int size, res, pos;
  
-     if (*data_size < 480 * sizeof(float)) {
-         av_log(ctx, AV_LOG_ERROR,
-                "Output buffer too small (%d given - %zu needed)\n",
-                *data_size, 480 * sizeof(float));
-         return -1;
-     }
-     *data_size = 0;
      /* Packets are sometimes a multiple of ctx->block_align, with a packet
 -     * header at each ctx->block_align bytes. However, Libav's ASF demuxer
 +     * header at each ctx->block_align bytes. However, FFmpeg's ASF demuxer
       * feeds us ASF packets, which may concatenate multiple "codec" packets
       * in a single "muxer" packet, so we artificially emulate that by
       * capping the packet size at ctx->block_align. */
Simple merge
@@@ -656,15 -655,52 +674,58 @@@ typedef struct AVStream 
          int64_t last_dts;
          int64_t duration_gcd;
          int duration_count;
 -        double duration_error[MAX_STD_TIMEBASES];
 +        double duration_error[2][2][MAX_STD_TIMEBASES];
          int64_t codec_info_duration;
      } *info;
 +
 +    /**
 +     * flag to indicate that probing is requested
 +     * NOT PART OF PUBLIC API
 +     */
 +    int request_probe;
+ #if !FF_API_REORDER_PRIVATE
+     const uint8_t *cur_ptr;
+     int cur_len;
+     AVPacket cur_pkt;
+     // Timestamp generation support:
+     /**
+      * Timestamp corresponding to the last dts sync point.
+      *
+      * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
+      * a DTS is received from the underlying container. Otherwise set to
+      * AV_NOPTS_VALUE by default.
+      */
+     int64_t reference_dts;
+     int64_t first_dts;
+     int64_t cur_dts;
+     int last_IP_duration;
+     int64_t last_IP_pts;
+     /**
+      * Number of packets to buffer for codec probing
+      */
+ #define MAX_PROBE_PACKETS 2500
+     int probe_packets;
+     /**
+      * last packet in packet_buffer for this stream when muxing.
+      */
+     struct AVPacketList *last_in_packet_buffer;
+     AVProbeData probe_data;
+ #define MAX_REORDER_DELAY 16
+     int64_t pts_buffer[MAX_REORDER_DELAY+1];
+     /* av_read_frame() support */
+     enum AVStreamParseType need_parsing;
+     struct AVCodecParserContext *parser;
+     AVIndexEntry *index_entries; /**< Only used if the format does not
+                                     support seeking natively. */
+     int nb_index_entries;
+     unsigned int index_entries_allocated_size;
+     int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
+ #endif
  } AVStream;
  
  #define AV_PROGRAM_RUNNING 1
@@@ -918,11 -954,42 +987,48 @@@ typedef struct AVFormatContext 
       */
      int error_recognition;
  
 +    /**
 +     * Transport stream id.
 +     * This will be moved into demuxer private options. Thus no API/ABI compatibility
 +     */
 +    int ts_id;
++
+     /*****************************************************************
+      * All fields below this line are not part of the public API. They
+      * may not be used outside of libavformat and can be changed and
+      * removed at will.
+      * New public fields should be added right above.
+      *****************************************************************
+      */
+ #if !FF_API_REORDER_PRIVATE
+     /**
+      * Raw packets from the demuxer, prior to parsing and decoding.
+      * This buffer is used for buffering packets until the codec can
+      * be identified, as parsing cannot be done without knowing the
+      * codec.
+      */
+     struct AVPacketList *raw_packet_buffer;
+     struct AVPacketList *raw_packet_buffer_end;
+     /**
+      * Remaining size available for raw_packet_buffer, in bytes.
+      */
+ #define RAW_PACKET_BUFFER_SIZE 2500000
+     int raw_packet_buffer_remaining_size;
+     /**
+      * This buffer is only needed when packets were already buffered but
+      * not decoded, for example to get the codec parameters in MPEG
+      * streams.
+      */
+     struct AVPacketList *packet_buffer;
+     struct AVPacketList *packet_buffer_end;
+     /* av_read_frame() support */
+     AVStream *cur_st;
+     /* av_seek_frame() support */
+     int64_t data_offset; /**< offset of the first packet */
+ #endif
  } AVFormatContext;
  
  typedef struct AVPacketList {
Simple merge
Simple merge
Simple merge
Simple merge
@@@ -27,8 -27,8 +27,9 @@@
  #include "libavutil/dict.h"
  #include "libavutil/mathematics.h"
  #include "libavutil/opt.h"
 +#include "libavutil/avassert.h"
  #include "libavcodec/bytestream.h"
+ #include "libavcodec/get_bits.h"
  #include "avformat.h"
  #include "mpegts.h"
  #include "internal.h"
@@@ -959,19 -1261,35 +1290,37 @@@ int ff_parse_mpeg2_descriptor(AVFormatC
          mpegts_find_stream_type(st, desc_tag, DESC_types);
  
      switch(desc_tag) {
+     case 0x1E: /* SL descriptor */
+         desc_es_id = get16(pp, desc_end);
+         if (ts && ts->pids[pid])
+             ts->pids[pid]->es_id = desc_es_id;
+         for (i = 0; i < mp4_descr_count; i++)
+         if (mp4_descr[i].dec_config_descr_len &&
+             mp4_descr[i].es_id == desc_es_id) {
+             AVIOContext pb;
+             ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
+                           mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
+             ff_mp4_read_dec_config_descr(fc, st, &pb);
+             if (st->codec->codec_id == CODEC_ID_AAC &&
+                 st->codec->extradata_size > 0)
+                 st->need_parsing = 0;
+             if (st->codec->codec_id == CODEC_ID_MPEG4SYSTEMS)
+                 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
+         }
+         break;
      case 0x1F: /* FMC descriptor */
          get16(pp, desc_end);
-         if ((st->codec->codec_id == CODEC_ID_AAC_LATM || st->request_probe>0) &&
-             mp4_dec_config_descr_len && mp4_es_id == pid) {
 -        if (mp4_descr_count > 0 && st->codec->codec_id == CODEC_ID_AAC_LATM &&
++        if (mp4_descr_count > 0 && (st->codec->codec_id == CODEC_ID_AAC_LATM || st->request_probe>0) &&
+             mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
              AVIOContext pb;
-             ffio_init_context(&pb, mp4_dec_config_descr,
-                           mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
+             ffio_init_context(&pb, mp4_descr->dec_config_descr,
+                           mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
              ff_mp4_read_dec_config_descr(fc, st, &pb);
              if (st->codec->codec_id == CODEC_ID_AAC &&
 -                st->codec->extradata_size > 0)
 -                st->need_parsing = 0;
 +                st->codec->extradata_size > 0){
 +                st->request_probe= st->need_parsing = 0;
 +                st->codec->codec_type= AVMEDIA_TYPE_AUDIO;
 +            }
          }
          break;
      case 0x56: /* DVB teletext descriptor */
@@@ -1129,10 -1445,10 +1480,10 @@@ static void pmt_cb(MpegTSFilter *filter
              pes = ts->pids[pid]->u.pes_filter.opaque;
              if (!pes->st) {
                  pes->st = avformat_new_stream(pes->stream, NULL);
 -                st->id = pes->pid;
 +                pes->st->id = pes->pid;
              }
              st = pes->st;
-         } else {
+         } else if (stream_type != 0x13) {
              if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
              pes = add_pes_stream(ts, pid, pcr_pid);
              if (pes) {
Simple merge
  #include "libavutil/mathematics.h"
  #include "libavcodec/bytestream.h"
  #include "avformat.h"
+ #include "internal.h"
  #include "mxf.h"
  
 +typedef enum {
 +    Header,
 +    BodyPartition,
 +    Footer
 +} MXFPartitionType;
 +
 +typedef enum {
 +    OP1a,
 +    OP1b,
 +    OP1c,
 +    OP2a,
 +    OP2b,
 +    OP2c,
 +    OP3a,
 +    OP3b,
 +    OP3c,
 +    OPAtom,
 +} MXFOP;
 +
 +typedef struct {
 +    int closed;
 +    int complete;
 +    MXFPartitionType type;
 +    uint64_t previous_partition;
 +    int index_sid;
 +    int body_sid;
 +} MXFPartition;
 +
  typedef struct {
      UID uid;
      enum MXFMetadataSetType type;
@@@ -1139,9 -1020,8 +1140,9 @@@ static int mxf_read_seek(AVFormatContex
      if (sample_time < 0)
          sample_time = 0;
      seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
 -    avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
 +    if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)
 +        return -1;
-     av_update_cur_dts(s, st, sample_time);
+     ff_update_cur_dts(s, st, sample_time);
      return 0;
  }
  
Simple merge
Simple merge
Simple merge
@@@ -333,13 -331,30 +333,14 @@@ AVInputFormat *av_probe_input_format3(A
                  score = 50;
              }
          }
 -        if (score > *score_max) {
 -            *score_max = score;
 +        if (score > score_max) {
 +            score_max = score;
              fmt = fmt1;
 -        }else if (score == *score_max)
 +        }else if (score == score_max)
              fmt = NULL;
      }
 -
 -    /* a hack for files with huge id3v2 tags -- try to guess by file extension. */
 -    if (!fmt && is_opened && *score_max < AVPROBE_SCORE_MAX/4) {
 -        while ((fmt = av_iformat_next(fmt)))
 -            if (fmt->extensions && av_match_ext(lpd.filename, fmt->extensions)) {
 -                *score_max = AVPROBE_SCORE_MAX/4;
 -                break;
 -            }
 -    }
 -
 -    if (!fmt && id3 && *score_max < AVPROBE_SCORE_MAX/4-1) {
 -        while ((fmt = av_iformat_next(fmt)))
 -            if (fmt->extensions && av_match_ext("mp3", fmt->extensions)) {
 -                *score_max = AVPROBE_SCORE_MAX/4-1;
 -                break;
 -            }
 -    }
 +    *score_ret= score_max;
      return fmt;
  }
  
@@@ -1602,8 -1572,7 +1618,8 @@@ int ff_seek_frame_binary(AVFormatContex
      if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
          return ret;
  
-     av_update_cur_dts(s, st, ts);
 +    ff_read_frame_flush(s);
+     ff_update_cur_dts(s, st, ts);
  
      return 0;
  }
Simple merge
index 88587c4,0000000..543fcb6
mode 100644,000000..100644
--- /dev/null
@@@ -1,1038 -1,0 +1,1038 @@@
-                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, 0, 0, 0, 0);
 +/*
 + * 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;
 +    } 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);
 +    } 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);
 +        }
 +    } else {
 +        av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
 +        av_free(wf);
 +        return NULL;
 +    }
 +    wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
 +
 +    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 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_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_videoinfo2 =
 +    {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
 +
 +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 = (av_int2dbl(value) - 25569.0) * 86400;
 +    struct tm *result= gmtime(&t);
 +    if (!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 = avformat_new_stream(s, NULL);
 +    if (!st)
 +        goto done;
 +    av_dict_set(&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_dict_set(&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, ff_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 = avformat_new_stream(s, NULL);
 +        if (!st)
 +            return NULL;
 +        st->id = sid;
 +        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, ff_mediasubtype_cpfilters_processed) &&
 +        !ff_guidcmp(formattype, ff_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, ff_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, ff_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_ptr 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, ff_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, NULL, 0, 0, NULL);
 +            }
 +        } 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_dict_set(&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) {
 +                    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 */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
 +            !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;
 +}
 +
 +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, ff_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, ff_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, ff_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, ff_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) {
 +            if (avio_seek(pb, 0, SEEK_SET) < 0)
 +                return -1;
 +        } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
 +            if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
 +                return -1;
 +        }
 +        if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
 +            return AVERROR(ERANGE);
 +        return 0;
 +    }
 +    if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
 +        return -1;
 +    wtv->pts = wtv->index_entries[i].timestamp;
 +    if (wtv->epoch != AV_NOPTS_VALUE)
 +        wtv->pts += wtv->epoch;
 +    wtv->last_valid_pts = wtv->pts;
 +    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,
 +};
Simple merge