text: /*
   * MOV demuxer
   * Copyright (c) 2001 Fabrice Bellard
   * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
   *
   * first version by Francois Revol <revol@free.fr>
   * seek function by Gael Chardon <gael.dev@4now.net>
   *
   * 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
   */
  
  #include <limits.h>
  
  //#define MOV_EXPORT_ALL_METADATA
  
  #include "libavutil/attributes.h"
  #include "libavutil/channel_layout.h"
  #include "libavutil/intreadwrite.h"
  #include "libavutil/intfloat.h"
  #include "libavutil/mathematics.h"
  #include "libavutil/avstring.h"
  #include "libavutil/dict.h"
  #include "libavutil/opt.h"
  #include "libavutil/timecode.h"
  #include "libavcodec/ac3tab.h"
  #include "avformat.h"
  #include "internal.h"
  #include "avio_internal.h"
  #include "riff.h"
  #include "isom.h"
  #include "libavcodec/get_bits.h"
  #include "id3v1.h"
  #include "mov_chan.h"
  
  #if CONFIG_ZLIB
  #include <zlib.h>
  #endif
  
  #include "qtpalette.h"
  
  
  #undef NDEBUG
  #include <assert.h>
  
  /* those functions parse an atom */
  /* links atom IDs to parse functions */
  typedef struct MOVParseTableEntry {
      uint32_t type;
      int (*parse)(MOVContext *ctx, AVIOContext *pb, MOVAtom atom);
  } MOVParseTableEntry;
  
  static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom);
  
  static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb,
                                               unsigned len, const char *key)
  {
      char buf[16];
  
      short current, total = 0;
      avio_rb16(pb); // unknown
      current = avio_rb16(pb);
      if (len >= 6)
          total = avio_rb16(pb);
      if (!total)
          snprintf(buf, sizeof(buf), "%d", current);
      else
          snprintf(buf, sizeof(buf), "%d/%d", current, total);
      av_dict_set(&c->fc->metadata, key, buf, 0);
  
      return 0;
  }
  
  static int mov_metadata_int8_bypass_padding(MOVContext *c, AVIOContext *pb,
                                              unsigned len, const char *key)
  {
      char buf[16];
  
      /* bypass padding bytes */
      avio_r8(pb);
      avio_r8(pb);
      avio_r8(pb);
  
      snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
      av_dict_set(&c->fc->metadata, key, buf, 0);
  
      return 0;
  }
  
  static int mov_metadata_int8_no_padding(MOVContext *c, AVIOContext *pb,
                                          unsigned len, const char *key)
  {
      char buf[16];
  
      snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
      av_dict_set(&c->fc->metadata, key, buf, 0);
  
      return 0;
  }
  
  static int mov_metadata_gnre(MOVContext *c, AVIOContext *pb,
                               unsigned len, const char *key)
  {
      short genre;
      char buf[20];
  
      avio_r8(pb); // unknown
  
      genre = avio_r8(pb);
      if (genre < 1 || genre > ID3v1_GENRE_MAX)
          return 0;
      snprintf(buf, sizeof(buf), "%s", ff_id3v1_genre_str[genre-1]);
      av_dict_set(&c->fc->metadata, key, buf, 0);
  
      return 0;
  }
  
  static int mov_read_custom_metadata(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      char key[1024]={0}, data[1024]={0};
      int i;
      AVStream *st;
      MOVStreamContext *sc;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      if (atom.size <= 8) return 0;
  
      for (i = 0; i < 3; i++) { // Parse up to three sub-atoms looking for name and data.
          int data_size = avio_rb32(pb);
          int tag = avio_rl32(pb);
          int str_size = 0, skip_size = 0;
          char *target = NULL;
  
          switch (tag) {
          case MKTAG('n','a','m','e'):
              avio_rb32(pb); // version/flags
              str_size = skip_size = data_size - 12;
              atom.size -= 12;
              target = key;
              break;
          case MKTAG('d','a','t','a'):
              avio_rb32(pb); // version/flags
              avio_rb32(pb); // reserved (zero)
              str_size = skip_size = data_size - 16;
              atom.size -= 16;
              target = data;
              break;
          default:
              skip_size = data_size - 8;
              str_size = 0;
              break;
          }
  
          if (target) {
              str_size = FFMIN3(sizeof(data)-1, str_size, atom.size);
              avio_read(pb, target, str_size);
              target[str_size] = 0;
          }
          atom.size -= skip_size;
  
          // If we didn't read the full data chunk for the sub-atom, skip to the end of it.
          if (skip_size > str_size) avio_skip(pb, skip_size - str_size);
      }
  
      if (*key && *data) {
          if (strcmp(key, "iTunSMPB") == 0) {
              int priming, remainder, samples;
              if(sscanf(data, "%*X %X %X %X", &priming, &remainder, &samples) == 3){
                  if(priming>0 && priming<16384)
                      sc->start_pad = priming;
                  return 1;
              }
          }
          if (strcmp(key, "cdec") == 0) {
  //             av_dict_set(&st->metadata, key, data, 0);
              return 1;
          }
      }
      return 0;
  }
  
  static const uint32_t mac_to_unicode[128] = {
      0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,
      0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,
      0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,
      0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,
      0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,
      0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,
      0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,
      0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,
      0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,
      0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,
      0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,
      0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,
      0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,
      0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,
      0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,
      0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,
  };
  
  static int mov_read_mac_string(MOVContext *c, AVIOContext *pb, int len,
                                 char *dst, int dstlen)
  {
      char *p = dst;
      char *end = dst+dstlen-1;
      int i;
  
      for (i = 0; i < len; i++) {
          uint8_t t, c = avio_r8(pb);
          if (c < 0x80 && p < end)
              *p++ = c;
          else if (p < end)
              PUT_UTF8(mac_to_unicode[c-0x80], t, if (p < end) *p++ = t;);
      }
      *p = 0;
      return p - dst;
  }
  
  static int mov_read_covr(MOVContext *c, AVIOContext *pb, int type, int len)
  {
      AVPacket pkt;
      AVStream *st;
      MOVStreamContext *sc;
      enum AVCodecID id;
      int ret;
  
      switch (type) {
      case 0xd:  id = AV_CODEC_ID_MJPEG; break;
      case 0xe:  id = AV_CODEC_ID_PNG;   break;
      case 0x1b: id = AV_CODEC_ID_BMP;   break;
      default:
          av_log(c->fc, AV_LOG_WARNING, "Unknown cover type: 0x%x.\n", type);
          avio_skip(pb, len);
          return 0;
      }
  
      st = avformat_new_stream(c->fc, NULL);
      if (!st)
          return AVERROR(ENOMEM);
      sc = av_mallocz(sizeof(*sc));
      if (!sc)
          return AVERROR(ENOMEM);
      st->priv_data = sc;
  
      ret = av_get_packet(pb, &pkt, len);
      if (ret < 0)
          return ret;
  
      st->disposition              |= AV_DISPOSITION_ATTACHED_PIC;
  
      st->attached_pic              = pkt;
      st->attached_pic.stream_index = st->index;
      st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
  
      st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
      st->codec->codec_id   = id;
  
      return 0;
  }
  
  static int mov_metadata_raw(MOVContext *c, AVIOContext *pb,
                              unsigned len, const char *key)
  {
      char *value = av_malloc(len + 1);
      if (!value)
          return AVERROR(ENOMEM);
      avio_read(pb, value, len);
      value[len] = 0;
      return av_dict_set(&c->fc->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
  }
  
  static int mov_read_udta_string(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
  #ifdef MOV_EXPORT_ALL_METADATA
      char tmp_key[5];
  #endif
      char str[1024], key2[16], language[4] = {0};
      const char *key = NULL;
      uint16_t langcode = 0;
      uint32_t data_type = 0, str_size;
      int (*parse)(MOVContext*, AVIOContext*, unsigned, const char*) = NULL;
  
      if (c->itunes_metadata && atom.type == MKTAG('-','-','-','-'))
          return mov_read_custom_metadata(c, pb, atom);
  
      switch (atom.type) {
      case MKTAG(0xa9,'n','a','m'): key = "title";     break;
      case MKTAG(0xa9,'a','u','t'):
      case MKTAG(0xa9,'A','R','T'): key = "artist";    break;
      case MKTAG( 'a','A','R','T'): key = "album_artist";    break;
      case MKTAG(0xa9,'w','r','t'): key = "composer";  break;
      case MKTAG( 'c','p','r','t'):
      case MKTAG(0xa9,'c','p','y'): key = "copyright"; break;
      case MKTAG(0xa9,'g','r','p'): key = "grouping"; break;
      case MKTAG(0xa9,'l','y','r'): key = "lyrics"; break;
      case MKTAG(0xa9,'c','m','t'):
      case MKTAG(0xa9,'i','n','f'): key = "comment";   break;
      case MKTAG(0xa9,'a','l','b'): key = "album";     break;
      case MKTAG(0xa9,'d','a','y'): key = "date";      break;
      case MKTAG(0xa9,'g','e','n'): key = "genre";     break;
      case MKTAG( 'g','n','r','e'): key = "genre";
          parse = mov_metadata_gnre; break;
      case MKTAG(0xa9,'t','o','o'):
      case MKTAG(0xa9,'s','w','r'): key = "encoder";   break;
      case MKTAG(0xa9,'e','n','c'): key = "encoder";   break;
      case MKTAG(0xa9,'m','a','k'): key = "make";      break;
      case MKTAG(0xa9,'m','o','d'): key = "model";     break;
      case MKTAG(0xa9,'x','y','z'): key = "location";  break;
      case MKTAG( 'd','e','s','c'): key = "description";break;
      case MKTAG( 'l','d','e','s'): key = "synopsis";  break;
      case MKTAG( 't','v','s','h'): key = "show";      break;
      case MKTAG( 't','v','e','n'): key = "episode_id";break;
      case MKTAG( 't','v','n','n'): key = "network";   break;
      case MKTAG( 't','r','k','n'): key = "track";
          parse = mov_metadata_track_or_disc_number; break;
      case MKTAG( 'd','i','s','k'): key = "disc";
          parse = mov_metadata_track_or_disc_number; break;
      case MKTAG( 't','v','e','s'): key = "episode_sort";
          parse = mov_metadata_int8_bypass_padding; break;
      case MKTAG( 't','v','s','n'): key = "season_number";
          parse = mov_metadata_int8_bypass_padding; break;
      case MKTAG( 's','t','i','k'): key = "media_type";
          parse = mov_metadata_int8_no_padding; break;
      case MKTAG( 'h','d','v','d'): key = "hd_video";
          parse = mov_metadata_int8_no_padding; break;
      case MKTAG( 'p','g','a','p'): key = "gapless_playback";
          parse = mov_metadata_int8_no_padding; break;
      case MKTAG( '@','P','R','M'):
          return mov_metadata_raw(c, pb, atom.size, "premiere_version");
      case MKTAG( '@','P','R','Q'):
          return mov_metadata_raw(c, pb, atom.size, "quicktime_version");
      }
  
      if (c->itunes_metadata && atom.size > 8) {
          int data_size = avio_rb32(pb);
          int tag = avio_rl32(pb);
          if (tag == MKTAG('d','a','t','a')) {
              data_type = avio_rb32(pb); // type
              avio_rb32(pb); // unknown
              str_size = data_size - 16;
              atom.size -= 16;
  
              if (atom.type == MKTAG('c', 'o', 'v', 'r')) {
                  int ret = mov_read_covr(c, pb, data_type, str_size);
                  if (ret < 0) {
                      av_log(c->fc, AV_LOG_ERROR, "Error parsing cover art.\n");
                      return ret;
                  }
              }
          } else return 0;
      } else if (atom.size > 4 && key && !c->itunes_metadata) {
          str_size = avio_rb16(pb); // string length
          langcode = avio_rb16(pb);
          ff_mov_lang_to_iso639(langcode, language);
          atom.size -= 4;
      } else
          str_size = atom.size;
  
  #ifdef MOV_EXPORT_ALL_METADATA
      if (!key) {
          snprintf(tmp_key, 5, "%.4s", (char*)&atom.type);
          key = tmp_key;
      }
  #endif
  
      if (!key)
          return 0;
      if (atom.size < 0)
          return AVERROR_INVALIDDATA;
  
      str_size = FFMIN3(sizeof(str)-1, str_size, atom.size);
  
      if (parse)
          parse(c, pb, str_size, key);
      else {
          if (data_type == 3 || (data_type == 0 && (langcode < 0x400 || langcode == 0x7fff))) { // MAC Encoded
              mov_read_mac_string(c, pb, str_size, str, sizeof(str));
          } else {
              avio_read(pb, str, str_size);
              str[str_size] = 0;
          }
          av_dict_set(&c->fc->metadata, key, str, 0);
          if (*language && strcmp(language, "und")) {
              snprintf(key2, sizeof(key2), "%s-%s", key, language);
              av_dict_set(&c->fc->metadata, key2, str, 0);
          }
      }
      av_dlog(c->fc, "lang \"%3s\" ", language);
      av_dlog(c->fc, "tag \"%s\" value \"%s\" atom \"%.4s\" %d %"PRId64"\n",
              key, str, (char*)&atom.type, str_size, atom.size);
  
      return 0;
  }
  
  static int mov_read_chpl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      int64_t start;
      int i, nb_chapters, str_len, version;
      char str[256+1];
  
      if ((atom.size -= 5) < 0)
          return 0;
  
      version = avio_r8(pb);
      avio_rb24(pb);
      if (version)
          avio_rb32(pb); // ???
      nb_chapters = avio_r8(pb);
  
      for (i = 0; i < nb_chapters; i++) {
          if (atom.size < 9)
              return 0;
  
          start = avio_rb64(pb);
          str_len = avio_r8(pb);
  
          if ((atom.size -= 9+str_len) < 0)
              return 0;
  
          avio_read(pb, str, str_len);
          str[str_len] = 0;
          avpriv_new_chapter(c->fc, i, (AVRational){1,10000000}, start, AV_NOPTS_VALUE, str);
      }
      return 0;
  }
  
  #define MIN_DATA_ENTRY_BOX_SIZE 12
  static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      int entries, i, j;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      avio_rb32(pb); // version + flags
      entries = avio_rb32(pb);
      if (entries >  (atom.size - 1) / MIN_DATA_ENTRY_BOX_SIZE + 1 ||
          entries >= UINT_MAX / sizeof(*sc->drefs))
          return AVERROR_INVALIDDATA;
      av_free(sc->drefs);
      sc->drefs_count = 0;
      sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));
      if (!sc->drefs)
          return AVERROR(ENOMEM);
      sc->drefs_count = entries;
  
      for (i = 0; i < sc->drefs_count; i++) {
          MOVDref *dref = &sc->drefs[i];
          uint32_t size = avio_rb32(pb);
          int64_t next = avio_tell(pb) + size - 4;
  
          if (size < 12)
              return AVERROR_INVALIDDATA;
  
          dref->type = avio_rl32(pb);
          avio_rb32(pb); // version + flags
          av_dlog(c->fc, "type %.4s size %d\n", (char*)&dref->type, size);
  
          if (dref->type == MKTAG('a','l','i','s') && size > 150) {
              /* macintosh alias record */
              uint16_t volume_len, len;
              int16_t type;
  
              avio_skip(pb, 10);
  
              volume_len = avio_r8(pb);
              volume_len = FFMIN(volume_len, 27);
              avio_read(pb, dref->volume, 27);
              dref->volume[volume_len] = 0;
              av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", dref->volume, volume_len);
  
              avio_skip(pb, 12);
  
              len = avio_r8(pb);
              len = FFMIN(len, 63);
              avio_read(pb, dref->filename, 63);
              dref->filename[len] = 0;
              av_log(c->fc, AV_LOG_DEBUG, "filename %s, len %d\n", dref->filename, len);
  
              avio_skip(pb, 16);
  
              /* read next level up_from_alias/down_to_target */
              dref->nlvl_from = avio_rb16(pb);
              dref->nlvl_to   = avio_rb16(pb);
              av_log(c->fc, AV_LOG_DEBUG, "nlvl from %d, nlvl to %d\n",
                     dref->nlvl_from, dref->nlvl_to);
  
              avio_skip(pb, 16);
  
              for (type = 0; type != -1 && avio_tell(pb) < next; ) {
                  if(url_feof(pb))
                      return AVERROR_EOF;
                  type = avio_rb16(pb);
                  len = avio_rb16(pb);
                  av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);
                  if (len&1)
                      len += 1;
                  if (type == 2) { // absolute path
                      av_free(dref->path);
                      dref->path = av_mallocz(len+1);
                      if (!dref->path)
                          return AVERROR(ENOMEM);
                      avio_read(pb, dref->path, len);
                      if (len > volume_len && !strncmp(dref->path, dref->volume, volume_len)) {
                          len -= volume_len;
                          memmove(dref->path, dref->path+volume_len, len);
                          dref->path[len] = 0;
                      }
                      for (j = 0; j < len; j++)
                          if (dref->path[j] == ':')
                              dref->path[j] = '/';
                      av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);
                  } else if (type == 0) { // directory name
                      av_free(dref->dir);
                      dref->dir = av_malloc(len+1);
                      if (!dref->dir)
                          return AVERROR(ENOMEM);
                      avio_read(pb, dref->dir, len);
                      dref->dir[len] = 0;
                      for (j = 0; j < len; j++)
                          if (dref->dir[j] == ':')
                              dref->dir[j] = '/';
                      av_log(c->fc, AV_LOG_DEBUG, "dir %s\n", dref->dir);
                  } else
                      avio_skip(pb, len);
              }
          }
          avio_seek(pb, next, SEEK_SET);
      }
      return 0;
  }
  
  static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      uint32_t type;
      uint32_t av_unused ctype;
      int title_size;
      char *title_str;
  
      if (c->fc->nb_streams < 1) // meta before first trak
          return 0;
  
      st = c->fc->streams[c->fc->nb_streams-1];
  
      avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
  
      /* component type */
      ctype = avio_rl32(pb);
      type = avio_rl32(pb); /* component subtype */
  
      av_dlog(c->fc, "ctype= %.4s (0x%08x)\n", (char*)&ctype, ctype);
      av_dlog(c->fc, "stype= %.4s\n", (char*)&type);
  
      if     (type == MKTAG('v','i','d','e'))
          st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
      else if (type == MKTAG('s','o','u','n'))
          st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
      else if (type == MKTAG('m','1','a',' '))
          st->codec->codec_id = AV_CODEC_ID_MP2;
      else if ((type == MKTAG('s','u','b','p')) || (type == MKTAG('c','l','c','p')))
          st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
  
      avio_rb32(pb); /* component  manufacture */
      avio_rb32(pb); /* component flags */
      avio_rb32(pb); /* component flags mask */
  
      title_size = atom.size - 24;
      if (title_size > 0) {
          title_str = av_malloc(title_size + 1); /* Add null terminator */
          if (!title_str)
              return AVERROR(ENOMEM);
          avio_read(pb, title_str, title_size);
          title_str[title_size] = 0;
          if (title_str[0])
              av_dict_set(&st->metadata, "handler_name", title_str +
                          (!c->isom && title_str[0] == title_size - 1), 0);
          av_freep(&title_str);
      }
  
      return 0;
  }
  
  int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      int tag;
  
      if (fc->nb_streams < 1)
          return 0;
      st = fc->streams[fc->nb_streams-1];
  
      avio_rb32(pb); /* version + flags */
      ff_mp4_read_descr(fc, pb, &tag);
      if (tag == MP4ESDescrTag) {
          ff_mp4_parse_es_descr(pb, NULL);
      } else
          avio_rb16(pb); /* ID */
  
      ff_mp4_read_descr(fc, pb, &tag);
      if (tag == MP4DecConfigDescrTag)
          ff_mp4_read_dec_config_descr(fc, st, pb);
      return 0;
  }
  
  static int mov_read_esds(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      return ff_mov_read_esds(c->fc, pb, atom);
  }
  
  static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      int ac3info, acmod, lfeon, bsmod;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      ac3info = avio_rb24(pb);
      bsmod = (ac3info >> 14) & 0x7;
      acmod = (ac3info >> 11) & 0x7;
      lfeon = (ac3info >> 10) & 0x1;
      st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon;
      st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];
      if (lfeon)
          st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;
      st->codec->audio_service_type = bsmod;
      if (st->codec->channels > 1 && bsmod == 0x7)
          st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
  
      return 0;
  }
  
  static int mov_read_dec3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      int eac3info, acmod, lfeon, bsmod;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      /* No need to parse fields for additional independent substreams and its
       * associated dependent substreams since libavcodec's E-AC-3 decoder
       * does not support them yet. */
      avio_rb16(pb); /* data_rate and num_ind_sub */
      eac3info = avio_rb24(pb);
      bsmod = (eac3info >> 12) & 0x1f;
      acmod = (eac3info >>  9) & 0x7;
      lfeon = (eac3info >>  8) & 0x1;
      st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];
      if (lfeon)
          st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;
      st->codec->channels = av_get_channel_layout_nb_channels(st->codec->channel_layout);
      st->codec->audio_service_type = bsmod;
      if (st->codec->channels > 1 && bsmod == 0x7)
          st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
  
      return 0;
  }
  
  static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      if (atom.size < 16)
          return 0;
  
      /* skip version and flags */
      avio_skip(pb, 4);
  
      ff_mov_read_chan(c->fc, pb, st, atom.size - 4);
  
      return 0;
  }
  
  static int mov_read_wfex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      if (ff_get_wav_header(pb, st->codec, atom.size) < 0) {
          av_log(c->fc, AV_LOG_WARNING, "get_wav_header failed\n");
      }
  
      return 0;
  }
  
  static int mov_read_pasp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      const int num = avio_rb32(pb);
      const int den = avio_rb32(pb);
      AVStream *st;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      if ((st->sample_aspect_ratio.den != 1 || st->sample_aspect_ratio.num) && // default
          (den != st->sample_aspect_ratio.den || num != st->sample_aspect_ratio.num)) {
          av_log(c->fc, AV_LOG_WARNING,
                 "sample aspect ratio already set to %d:%d, ignoring 'pasp' atom (%d:%d)\n",
                 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
                 num, den);
      } else if (den != 0) {
          st->sample_aspect_ratio.num = num;
          st->sample_aspect_ratio.den = den;
      }
      return 0;
  }
  
  /* this atom contains actual media data */
  static int mov_read_mdat(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      if (atom.size == 0) /* wrong one (MP4) */
          return 0;
      c->found_mdat=1;
      return 0; /* now go for moov */
  }
  
  /* read major brand, minor version and compatible brands and store them as metadata */
  static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      uint32_t minor_ver;
      int comp_brand_size;
      char minor_ver_str[11]; /* 32 bit integer -> 10 digits + null */
      char* comp_brands_str;
      uint8_t type[5] = {0};
  
      avio_read(pb, type, 4);
      if (strcmp(type, "qt  "))
          c->isom = 1;
      av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
      av_dict_set(&c->fc->metadata, "major_brand", type, 0);
      minor_ver = avio_rb32(pb); /* minor version */
      snprintf(minor_ver_str, sizeof(minor_ver_str), "%d", minor_ver);
      av_dict_set(&c->fc->metadata, "minor_version", minor_ver_str, 0);
  
      comp_brand_size = atom.size - 8;
      if (comp_brand_size < 0)
          return AVERROR_INVALIDDATA;
      comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */
      if (!comp_brands_str)
          return AVERROR(ENOMEM);
      avio_read(pb, comp_brands_str, comp_brand_size);
      comp_brands_str[comp_brand_size] = 0;
      av_dict_set(&c->fc->metadata, "compatible_brands", comp_brands_str, 0);
      av_freep(&comp_brands_str);
  
      return 0;
  }
  
  /* this atom should contain all header atoms */
  static int mov_read_moov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      int ret;
  
      if (c->found_moov) {
          av_log(c->fc, AV_LOG_WARNING, "Found duplicated MOOV Atom. Skipped it\n");
          avio_skip(pb, atom.size);
          return 0;
      }
  
      if ((ret = mov_read_default(c, pb, atom)) < 0)
          return ret;
      /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
      /* so we don't parse the whole file if over a network */
      c->found_moov=1;
      return 0; /* now go for mdat */
  }
  
  static int mov_read_moof(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      c->fragment.moof_offset = avio_tell(pb) - 8;
      av_dlog(c->fc, "moof offset %"PRIx64"\n", c->fragment.moof_offset);
      return mov_read_default(c, pb, atom);
  }
  
  static void mov_metadata_creation_time(AVDictionary **metadata, int64_t time)
  {
      char buffer[32];
      if (time) {
          struct tm *ptm;
          time_t timet;
          if(time >= 2082844800)
              time -= 2082844800;  /* seconds between 1904-01-01 and Epoch */
          timet = time;
          ptm = gmtime(&timet);
          if (!ptm) return;
          strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);
          av_dict_set(metadata, "creation_time", buffer, 0);
      }
  }
  
  static int mov_read_mdhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      int version;
      char language[4] = {0};
      unsigned lang;
      int64_t creation_time;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      if (sc->time_scale) {
          av_log(c->fc, AV_LOG_ERROR, "Multiple mdhd?\n");
          return AVERROR_INVALIDDATA;
      }
  
      version = avio_r8(pb);
      if (version > 1) {
          avpriv_request_sample(c->fc, "Version %d", version);
          return AVERROR_PATCHWELCOME;
      }
      avio_rb24(pb); /* flags */
      if (version == 1) {
          creation_time = avio_rb64(pb);
          avio_rb64(pb);
      } else {
          creation_time = avio_rb32(pb);
          avio_rb32(pb); /* modification time */
      }
      mov_metadata_creation_time(&st->metadata, creation_time);
  
      sc->time_scale = avio_rb32(pb);
      st->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
  
      lang = avio_rb16(pb); /* language */
      if (ff_mov_lang_to_iso639(lang, language))
          av_dict_set(&st->metadata, "language", language, 0);
      avio_rb16(pb); /* quality */
  
      return 0;
  }
  
  static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      int64_t creation_time;
      int version = avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
  
      if (version == 1) {
          creation_time = avio_rb64(pb);
          avio_rb64(pb);
      } else {
          creation_time = avio_rb32(pb);
          avio_rb32(pb); /* modification time */
      }
      mov_metadata_creation_time(&c->fc->metadata, creation_time);
      c->time_scale = avio_rb32(pb); /* time scale */
  
      av_dlog(c->fc, "time scale = %i\n", c->time_scale);
  
      c->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
      // set the AVCodecContext duration because the duration of individual tracks
      // may be inaccurate
      if (c->time_scale > 0 && !c->trex_data)
          c->fc->duration = av_rescale(c->duration, AV_TIME_BASE, c->time_scale);
      avio_rb32(pb); /* preferred scale */
  
      avio_rb16(pb); /* preferred volume */
  
      avio_skip(pb, 10); /* reserved */
  
      avio_skip(pb, 36); /* display matrix */
  
      avio_rb32(pb); /* preview time */
      avio_rb32(pb); /* preview duration */
      avio_rb32(pb); /* poster time */
      avio_rb32(pb); /* selection time */
      avio_rb32(pb); /* selection duration */
      avio_rb32(pb); /* current time */
      avio_rb32(pb); /* next track ID */
      return 0;
  }
  
  static int mov_read_enda(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      int little_endian;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      little_endian = avio_rb16(pb) & 0xFF;
      av_dlog(c->fc, "enda %d\n", little_endian);
      if (little_endian == 1) {
          switch (st->codec->codec_id) {
          case AV_CODEC_ID_PCM_S24BE:
              st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;
              break;
          case AV_CODEC_ID_PCM_S32BE:
              st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
              break;
          case AV_CODEC_ID_PCM_F32BE:
              st->codec->codec_id = AV_CODEC_ID_PCM_F32LE;
              break;
          case AV_CODEC_ID_PCM_F64BE:
              st->codec->codec_id = AV_CODEC_ID_PCM_F64LE;
              break;
          default:
              break;
          }
      }
      return 0;
  }
  
  static int mov_read_fiel(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      unsigned mov_field_order;
      enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;
  
      if (c->fc->nb_streams < 1) // will happen with jp2 files
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      if (atom.size < 2)
          return AVERROR_INVALIDDATA;
      mov_field_order = avio_rb16(pb);
      if ((mov_field_order & 0xFF00) == 0x0100)
          decoded_field_order = AV_FIELD_PROGRESSIVE;
      else if ((mov_field_order & 0xFF00) == 0x0200) {
          switch (mov_field_order & 0xFF) {
          case 0x01: decoded_field_order = AV_FIELD_TT;
                     break;
          case 0x06: decoded_field_order = AV_FIELD_BB;
                     break;
          case 0x09: decoded_field_order = AV_FIELD_TB;
                     break;
          case 0x0E: decoded_field_order = AV_FIELD_BT;
                     break;
          }
      }
      if (decoded_field_order == AV_FIELD_UNKNOWN && mov_field_order) {
          av_log(NULL, AV_LOG_ERROR, "Unknown MOV field order 0x%04x\n", mov_field_order);
      }
      st->codec->field_order = decoded_field_order;
  
      return 0;
  }
  
  /* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */
  static int mov_read_extradata(MOVContext *c, AVIOContext *pb, MOVAtom atom,
                                enum AVCodecID codec_id)
  {
      AVStream *st;
      uint64_t size;
      uint8_t *buf;
  
      if (c->fc->nb_streams < 1) // will happen with jp2 files
          return 0;
      st= c->fc->streams[c->fc->nb_streams-1];
  
      if (st->codec->codec_id != codec_id)
          return 0; /* unexpected codec_id - don't mess with extradata */
  
      size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
      if (size > INT_MAX || (uint64_t)atom.size > INT_MAX)
          return AVERROR_INVALIDDATA;
      buf= av_realloc(st->codec->extradata, size);
      if (!buf)
          return AVERROR(ENOMEM);
      st->codec->extradata= buf;
      buf+= st->codec->extradata_size;
      st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
      AV_WB32(       buf    , atom.size + 8);
      AV_WL32(       buf + 4, atom.type);
      avio_read(pb, buf + 8, atom.size);
      return 0;
  }
  
  /* wrapper functions for reading ALAC/AVS/MJPEG/MJPEG2000 extradata atoms only for those codecs */
  static int mov_read_alac(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      return mov_read_extradata(c, pb, atom, AV_CODEC_ID_ALAC);
  }
  
  static int mov_read_avss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      return mov_read_extradata(c, pb, atom, AV_CODEC_ID_AVS);
  }
  
  static int mov_read_jp2h(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      return mov_read_extradata(c, pb, atom, AV_CODEC_ID_JPEG2000);
  }
  
  static int mov_read_avid(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      return mov_read_extradata(c, pb, atom, AV_CODEC_ID_AVUI);
  }
  
  static int mov_read_ares(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVCodecContext *codec = c->fc->streams[c->fc->nb_streams-1]->codec;
      if (codec->codec_tag == MKTAG('A', 'V', 'i', 'n') &&
          codec->codec_id == AV_CODEC_ID_H264 &&
          atom.size > 11) {
          avio_skip(pb, 10);
          /* For AVID AVCI50, force width of 1440 to be able to select the correct SPS and PPS */
          if (avio_rb16(pb) == 0xd4d)
              codec->width = 1440;
          return 0;
      }
  
      return mov_read_avid(c, pb, atom);
  }
  
  static int mov_read_svq3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      return mov_read_extradata(c, pb, atom, AV_CODEC_ID_SVQ3);
  }
  
  static int mov_read_wave(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      if ((uint64_t)atom.size > (1<<30))
          return AVERROR_INVALIDDATA;
  
      if (st->codec->codec_id == AV_CODEC_ID_QDM2 ||
          st->codec->codec_id == AV_CODEC_ID_QDMC ||
          st->codec->codec_id == AV_CODEC_ID_SPEEX) {
          // pass all frma atom to codec, needed at least for QDMC and QDM2
          av_free(st->codec->extradata);
          st->codec->extradata_size = 0;
          st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
          if (!st->codec->extradata)
              return AVERROR(ENOMEM);
          st->codec->extradata_size = atom.size;
          avio_read(pb, st->codec->extradata, atom.size);
      } else if (atom.size > 8) { /* to read frma, esds atoms */
          int ret;
          if ((ret = mov_read_default(c, pb, atom)) < 0)
              return ret;
      } else
          avio_skip(pb, atom.size);
      return 0;
  }
  
  /**
   * This function reads atom content and puts data in extradata without tag
   * nor size unlike mov_read_extradata.
   */
  static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      if ((uint64_t)atom.size > (1<<30))
          return AVERROR_INVALIDDATA;
  
      if (atom.size >= 10) {
          // Broken files created by legacy versions of libavformat will
          // wrap a whole fiel atom inside of a glbl atom.
          unsigned size = avio_rb32(pb);
          unsigned type = avio_rl32(pb);
          avio_seek(pb, -8, SEEK_CUR);
          if (type == MKTAG('f','i','e','l') && size == atom.size)
              return mov_read_default(c, pb, atom);
      }
      av_free(st->codec->extradata);
      st->codec->extradata_size = 0;
      st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
      if (!st->codec->extradata)
          return AVERROR(ENOMEM);
      st->codec->extradata_size = atom.size;
      avio_read(pb, st->codec->extradata, atom.size);
      return 0;
  }
  
  static int mov_read_dvc1(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      uint8_t profile_level;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      if (atom.size >= (1<<28) || atom.size < 7)
          return AVERROR_INVALIDDATA;
  
      profile_level = avio_r8(pb);
      if ((profile_level & 0xf0) != 0xc0)
          return 0;
  
      av_free(st->codec->extradata);
      st->codec->extradata_size = 0;
      st->codec->extradata = av_mallocz(atom.size - 7 + FF_INPUT_BUFFER_PADDING_SIZE);
      if (!st->codec->extradata)
          return AVERROR(ENOMEM);
      st->codec->extradata_size = atom.size - 7;
      avio_seek(pb, 6, SEEK_CUR);
      avio_read(pb, st->codec->extradata, st->codec->extradata_size);
      return 0;
  }
  
  /**
   * An strf atom is a BITMAPINFOHEADER struct. This struct is 40 bytes itself,
   * but can have extradata appended at the end after the 40 bytes belonging
   * to the struct.
   */
  static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
  
      if (c->fc->nb_streams < 1)
          return 0;
      if (atom.size <= 40)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
  
      if ((uint64_t)atom.size > (1<<30))
          return AVERROR_INVALIDDATA;
  
      av_free(st->codec->extradata);
      st->codec->extradata_size = 0;
      st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);
      if (!st->codec->extradata)
          return AVERROR(ENOMEM);
      st->codec->extradata_size = atom.size - 40;
      avio_skip(pb, 40);
      avio_read(pb, st->codec->extradata, atom.size - 40);
      return 0;
  }
  
  static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      unsigned int i, entries;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
  
      entries = avio_rb32(pb);
  
      if (!entries)
          return 0;
      if (entries >= UINT_MAX/sizeof(int64_t))
          return AVERROR_INVALIDDATA;
  
      sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));
      if (!sc->chunk_offsets)
          return AVERROR(ENOMEM);
      sc->chunk_count = entries;
  
      if      (atom.type == MKTAG('s','t','c','o'))
          for (i = 0; i < entries && !pb->eof_reached; i++)
              sc->chunk_offsets[i] = avio_rb32(pb);
      else if (atom.type == MKTAG('c','o','6','4'))
          for (i = 0; i < entries && !pb->eof_reached; i++)
              sc->chunk_offsets[i] = avio_rb64(pb);
      else
          return AVERROR_INVALIDDATA;
  
      sc->chunk_count = i;
  
      if (pb->eof_reached)
          return AVERROR_EOF;
  
      return 0;
  }
  
  /**
   * Compute codec id for 'lpcm' tag.
   * See CoreAudioTypes and AudioStreamBasicDescription at Apple.
   */
  enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
  {
      /* lpcm flags:
       * 0x1 = float
       * 0x2 = big-endian
       * 0x4 = signed
       */
      return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);
  }
  
  int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)
  {
      AVStream *st;
      MOVStreamContext *sc;
      int j, pseudo_stream_id;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      for (pseudo_stream_id = 0;
           pseudo_stream_id < entries && !pb->eof_reached;
           pseudo_stream_id++) {
          //Parsing Sample description table
          enum AVCodecID id;
          int dref_id = 1;
          MOVAtom a = { AV_RL32("stsd") };
          int64_t start_pos = avio_tell(pb);
          int64_t size = avio_rb32(pb); /* size */
          uint32_t format = avio_rl32(pb); /* data format */
  
          if (size >= 16) {
              avio_rb32(pb); /* reserved */
              avio_rb16(pb); /* reserved */
              dref_id = avio_rb16(pb);
          }else if (size <= 7){
              av_log(c->fc, AV_LOG_ERROR, "invalid size %"PRId64" in stsd\n", size);
              return AVERROR_INVALIDDATA;
          }
  
          if (st->codec->codec_tag &&
              st->codec->codec_tag != format &&
              (c->fc->video_codec_id ? ff_codec_get_id(ff_codec_movvideo_tags, format) != c->fc->video_codec_id
                                     : st->codec->codec_tag != MKTAG('j','p','e','g'))
             ){
              /* Multiple fourcc, we skip JPEG. This is not correct, we should
               * export it as a separate AVStream but this needs a few changes
               * in the MOV demuxer, patch welcome. */
              av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");
              avio_skip(pb, size - (avio_tell(pb) - start_pos));
              continue;
          }
          /* we cannot demux concatenated h264 streams because of different extradata */
          if (st->codec->codec_tag && st->codec->codec_tag == AV_RL32("avc1"))
              av_log(c->fc, AV_LOG_WARNING, "Concatenated H.264 might not play corrently.\n");
          sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;
          sc->dref_id= dref_id;
  
          st->codec->codec_tag = format;
          id = ff_codec_get_id(ff_codec_movaudio_tags, format);
          if (id<=0 && ((format&0xFFFF) == 'm'+('s'<<8) || (format&0xFFFF) == 'T'+('S'<<8)))
              id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format)&0xFFFF);
  
          if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {
              st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
          } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO && /* do not overwrite codec type */
                     format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */
              id = ff_codec_get_id(ff_codec_movvideo_tags, format);
              if (id <= 0)
                  id = ff_codec_get_id(ff_codec_bmp_tags, format);
              if (id > 0)
                  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
              else if (st->codec->codec_type == AVMEDIA_TYPE_DATA ||
                       (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
                        st->codec->codec_id == AV_CODEC_ID_NONE)){
                  id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);
                  if (id > 0)
                      st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
              }
          }
  
          av_dlog(c->fc, "size=%"PRId64" 4CC= %c%c%c%c codec_type=%d\n", size,
                  (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,
                  (format >> 24) & 0xff, st->codec->codec_type);
  
          if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
              unsigned int color_depth, len;
              int color_greyscale;
              int color_table_id;
  
              st->codec->codec_id = id;
              avio_rb16(pb); /* version */
              avio_rb16(pb); /* revision level */
              avio_rb32(pb); /* vendor */
              avio_rb32(pb); /* temporal quality */
              avio_rb32(pb); /* spatial quality */
  
              st->codec->width = avio_rb16(pb); /* width */
              st->codec->height = avio_rb16(pb); /* height */
  
              avio_rb32(pb); /* horiz resolution */
              avio_rb32(pb); /* vert resolution */
              avio_rb32(pb); /* data size, always 0 */
              avio_rb16(pb); /* frames per samples */
  
              len = avio_r8(pb); /* codec name, pascal string */
              if (len > 31)
                  len = 31;
              mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);
              if (len < 31)
                  avio_skip(pb, 31 - len);
              /* codec_tag YV12 triggers an UV swap in rawdec.c */
              if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25)){
                  st->codec->codec_tag=MKTAG('I', '4', '2', '0');
                  st->codec->width &= ~1;
                  st->codec->height &= ~1;
              }
              /* Flash Media Server uses tag H263 with Sorenson Spark */
              if (format == MKTAG('H','2','6','3') &&
                  !memcmp(st->codec->codec_name, "Sorenson H263", 13))
                  st->codec->codec_id = AV_CODEC_ID_FLV1;
  
              st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */
              color_table_id = avio_rb16(pb); /* colortable id */
              av_dlog(c->fc, "depth %d, ctab id %d\n",
                     st->codec->bits_per_coded_sample, color_table_id);
              /* figure out the palette situation */
              color_depth = st->codec->bits_per_coded_sample & 0x1F;
              color_greyscale = st->codec->bits_per_coded_sample & 0x20;
  
              /* if the depth is 2, 4, or 8 bpp, file is palettized */
              if ((color_depth == 2) || (color_depth == 4) ||
                  (color_depth == 8)) {
                  /* for palette traversal */
                  unsigned int color_start, color_count, color_end;
                  unsigned char a, r, g, b;
  
                  if (color_greyscale) {
                      int color_index, color_dec;
                      /* compute the greyscale palette */
                      st->codec->bits_per_coded_sample = color_depth;
                      color_count = 1 << color_depth;
                      color_index = 255;
                      color_dec = 256 / (color_count - 1);
                      for (j = 0; j < color_count; j++) {
                          if (id == AV_CODEC_ID_CINEPAK){
                              r = g = b = color_count - 1 - color_index;
                          }else
                          r = g = b = color_index;
                          sc->palette[j] =
                              (0xFFU << 24) | (r << 16) | (g << 8) | (b);
                          color_index -= color_dec;
                          if (color_index < 0)
                              color_index = 0;
                      }
                  } else if (color_table_id) {
                      const uint8_t *color_table;
                      /* if flag bit 3 is set, use the default palette */
                      color_count = 1 << color_depth;
                      if (color_depth == 2)
                          color_table = ff_qt_default_palette_4;
                      else if (color_depth == 4)
                          color_table = ff_qt_default_palette_16;
                      else
                          color_table = ff_qt_default_palette_256;
  
                      for (j = 0; j < color_count; j++) {
                          r = color_table[j * 3 + 0];
                          g = color_table[j * 3 + 1];
                          b = color_table[j * 3 + 2];
                          sc->palette[j] =
                              (0xFFU << 24) | (r << 16) | (g << 8) | (b);
                      }
                  } else {
                      /* load the palette from the file */
                      color_start = avio_rb32(pb);
                      color_count = avio_rb16(pb);
                      color_end = avio_rb16(pb);
                      if ((color_start <= 255) &&
                          (color_end <= 255)) {
                          for (j = color_start; j <= color_end; j++) {
                              /* each A, R, G, or B component is 16 bits;
                               * only use the top 8 bits */
                              a = avio_r8(pb);
                              avio_r8(pb);
                              r = avio_r8(pb);
                              avio_r8(pb);
                              g = avio_r8(pb);
                              avio_r8(pb);
                              b = avio_r8(pb);
                              avio_r8(pb);
                              sc->palette[j] =
                                  (a << 24 ) | (r << 16) | (g << 8) | (b);
                          }
                      }
                  }
                  sc->has_palette = 1;
              }
          } else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
              int bits_per_sample, flags;
              uint16_t version = avio_rb16(pb);
              AVDictionaryEntry *compatible_brands = av_dict_get(c->fc->metadata, "compatible_brands", NULL, AV_DICT_MATCH_CASE);
  
              st->codec->codec_id = id;
              avio_rb16(pb); /* revision level */
              avio_rb32(pb); /* vendor */
  
              st->codec->channels = avio_rb16(pb);             /* channel count */
              av_dlog(c->fc, "audio channels %d\n", st->codec->channels);
              st->codec->bits_per_coded_sample = avio_rb16(pb);      /* sample size */
  
              sc->audio_cid = avio_rb16(pb);
              avio_rb16(pb); /* packet size = 0 */
  
              st->codec->sample_rate = ((avio_rb32(pb) >> 16));
  
              //Read QT version 1 fields. In version 0 these do not exist.
              av_dlog(c->fc, "version =%d, isom =%d\n",version,c->isom);
              if (!c->isom ||
                  (compatible_brands && strstr(compatible_brands->value, "qt  "))) {
                  if (version==1) {
                      sc->samples_per_frame = avio_rb32(pb);
                      avio_rb32(pb); /* bytes per packet */
                      sc->bytes_per_frame = avio_rb32(pb);
                      avio_rb32(pb); /* bytes per sample */
                  } else if (version==2) {
                      avio_rb32(pb); /* sizeof struct only */
                      st->codec->sample_rate = av_int2double(avio_rb64(pb)); /* float 64 */
                      st->codec->channels = avio_rb32(pb);
                      avio_rb32(pb); /* always 0x7F000000 */
                      st->codec->bits_per_coded_sample = avio_rb32(pb); /* bits per channel if sound is uncompressed */
                      flags = avio_rb32(pb); /* lpcm format specific flag */
                      sc->bytes_per_frame = avio_rb32(pb); /* bytes per audio packet if constant */
                      sc->samples_per_frame = avio_rb32(pb); /* lpcm frames per audio packet if constant */
                      if (format == MKTAG('l','p','c','m'))
                          st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, flags);
                  }
              }
  
              switch (st->codec->codec_id) {
              case AV_CODEC_ID_PCM_S8:
              case AV_CODEC_ID_PCM_U8:
                  if (st->codec->bits_per_coded_sample == 16)
                      st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
                  break;
              case AV_CODEC_ID_PCM_S16LE:
              case AV_CODEC_ID_PCM_S16BE:
                  if (st->codec->bits_per_coded_sample == 8)
                      st->codec->codec_id = AV_CODEC_ID_PCM_S8;
                  else if (st->codec->bits_per_coded_sample == 24)
                      st->codec->codec_id =
                          st->codec->codec_id == AV_CODEC_ID_PCM_S16BE ?
                          AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
                  break;
              /* set values for old format before stsd version 1 appeared */
              case AV_CODEC_ID_MACE3:
                  sc->samples_per_frame = 6;
                  sc->bytes_per_frame = 2*st->codec->channels;
                  break;
              case AV_CODEC_ID_MACE6:
                  sc->samples_per_frame = 6;
                  sc->bytes_per_frame = 1*st->codec->channels;
                  break;
              case AV_CODEC_ID_ADPCM_IMA_QT:
                  sc->samples_per_frame = 64;
                  sc->bytes_per_frame = 34*st->codec->channels;
                  break;
              case AV_CODEC_ID_GSM:
                  sc->samples_per_frame = 160;
                  sc->bytes_per_frame = 33;
                  break;
              default:
                  break;
              }
  
              bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);
              if (bits_per_sample) {
                  st->codec->bits_per_coded_sample = bits_per_sample;
                  sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;
              }
          } else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){
              // ttxt stsd contains display flags, justification, background
              // color, fonts, and default styles, so fake an atom to read it
              MOVAtom fake_atom = { .size = size - (avio_tell(pb) - start_pos) };
              if (format != AV_RL32("mp4s")) // mp4s contains a regular esds atom
                  mov_read_glbl(c, pb, fake_atom);
              st->codec->codec_id= id;
              st->codec->width = sc->width;
              st->codec->height = sc->height;
          } else {
              if (st->codec->codec_tag == MKTAG('t','m','c','d')) {
                  MOVStreamContext *tmcd_ctx = st->priv_data;
                  int val;
                  avio_rb32(pb);       /* reserved */
                  val = avio_rb32(pb); /* flags */
                  tmcd_ctx->tmcd_flags = val;
                  if (val & 1)
                      st->codec->flags2 |= CODEC_FLAG2_DROP_FRAME_TIMECODE;
                  avio_rb32(pb); /* time scale */
                  avio_rb32(pb); /* frame duration */
                  st->codec->time_base.den = avio_r8(pb); /* number of frame */
                  st->codec->time_base.num = 1;
              }
              /* other codec type, just skip (rtp, mp4s, ...) */
              avio_skip(pb, size - (avio_tell(pb) - start_pos));
          }
          /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */
          a.size = size - (avio_tell(pb) - start_pos);
          if (a.size > 8) {
              int ret;
              if ((ret = mov_read_default(c, pb, a)) < 0)
                  return ret;
          } else if (a.size > 0)
              avio_skip(pb, a.size);
      }
  
      if (pb->eof_reached)
          return AVERROR_EOF;
  
      if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1)
          st->codec->sample_rate= sc->time_scale;
  
      /* special codec parameters handling */
      switch (st->codec->codec_id) {
  #if CONFIG_DV_DEMUXER
      case AV_CODEC_ID_DVAUDIO:
          c->dv_fctx = avformat_alloc_context();
          c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);
          if (!c->dv_demux) {
              av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");
              return AVERROR(ENOMEM);
          }
          sc->dv_audio_container = 1;
          st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
          break;
  #endif
      /* no ifdef since parameters are always those */
      case AV_CODEC_ID_QCELP:
          // force sample rate for qcelp when not stored in mov
          if (st->codec->codec_tag != MKTAG('Q','c','l','p'))
              st->codec->sample_rate = 8000;
          st->codec->channels= 1; /* really needed */
          break;
      case AV_CODEC_ID_AMR_NB:
          st->codec->channels= 1; /* really needed */
          /* force sample rate for amr, stsd in 3gp does not store sample rate */
          st->codec->sample_rate = 8000;
          break;
      case AV_CODEC_ID_AMR_WB:
          st->codec->channels    = 1;
          st->codec->sample_rate = 16000;
          break;
      case AV_CODEC_ID_MP2:
      case AV_CODEC_ID_MP3:
          st->codec->codec_type = AVMEDIA_TYPE_AUDIO; /* force type after stsd for m1a hdlr */
          st->need_parsing = AVSTREAM_PARSE_FULL;
          break;
      case AV_CODEC_ID_GSM:
      case AV_CODEC_ID_ADPCM_MS:
      case AV_CODEC_ID_ADPCM_IMA_WAV:
      case AV_CODEC_ID_ILBC:
      case AV_CODEC_ID_MACE3:
      case AV_CODEC_ID_MACE6:
      case AV_CODEC_ID_QDM2:
          st->codec->block_align = sc->bytes_per_frame;
          break;
      case AV_CODEC_ID_ALAC:
          if (st->codec->extradata_size == 36) {
              st->codec->channels   = AV_RB8 (st->codec->extradata+21);
              st->codec->sample_rate = AV_RB32(st->codec->extradata+32);
          }
          break;
      case AV_CODEC_ID_AC3:
          st->need_parsing = AVSTREAM_PARSE_FULL;
          break;
      case AV_CODEC_ID_MPEG1VIDEO:
          st->need_parsing = AVSTREAM_PARSE_FULL;
          break;
      case AV_CODEC_ID_VC1:
          st->need_parsing = AVSTREAM_PARSE_FULL;
          break;
      default:
          break;
      }
  
      return 0;
  }
  
  static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      int entries;
  
      avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
      entries = avio_rb32(pb);
  
      return ff_mov_read_stsd_entries(c, pb, entries);
  }
  
  static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      unsigned int i, entries;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
  
      entries = avio_rb32(pb);
  
      av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
  
      if (!entries)
          return 0;
      if (entries >= UINT_MAX / sizeof(*sc->stsc_data))
          return AVERROR_INVALIDDATA;
      sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));
      if (!sc->stsc_data)
          return AVERROR(ENOMEM);
  
      for (i = 0; i < entries && !pb->eof_reached; i++) {
          sc->stsc_data[i].first = avio_rb32(pb);
          sc->stsc_data[i].count = avio_rb32(pb);
          sc->stsc_data[i].id = avio_rb32(pb);
      }
  
      sc->stsc_count = i;
  
      if (pb->eof_reached)
          return AVERROR_EOF;
  
      return 0;
  }
  
  static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      unsigned i, entries;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      avio_rb32(pb); // version + flags
  
      entries = avio_rb32(pb);
      if (entries >= UINT_MAX / sizeof(*sc->stps_data))
          return AVERROR_INVALIDDATA;
      sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));
      if (!sc->stps_data)
          return AVERROR(ENOMEM);
  
      for (i = 0; i < entries && !pb->eof_reached; i++) {
          sc->stps_data[i] = avio_rb32(pb);
          //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);
      }
  
      sc->stps_count = i;
  
      if (pb->eof_reached)
          return AVERROR_EOF;
  
      return 0;
  }
  
  static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      unsigned int i, entries;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
  
      entries = avio_rb32(pb);
  
      av_dlog(c->fc, "keyframe_count = %d\n", entries);
  
      if (!entries)
      {
          sc->keyframe_absent = 1;
          return 0;
      }
      if (entries >= UINT_MAX / sizeof(int))
          return AVERROR_INVALIDDATA;
      sc->keyframes = av_malloc(entries * sizeof(int));
      if (!sc->keyframes)
          return AVERROR(ENOMEM);
  
      for (i = 0; i < entries && !pb->eof_reached; i++) {
          sc->keyframes[i] = avio_rb32(pb);
          //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);
      }
  
      sc->keyframe_count = i;
  
      if (pb->eof_reached)
          return AVERROR_EOF;
  
      return 0;
  }
  
  static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      unsigned int i, entries, sample_size, field_size, num_bytes;
      GetBitContext gb;
      unsigned char* buf;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
  
      if (atom.type == MKTAG('s','t','s','z')) {
          sample_size = avio_rb32(pb);
          if (!sc->sample_size) /* do not overwrite value computed in stsd */
              sc->sample_size = sample_size;
          sc->stsz_sample_size = sample_size;
          field_size = 32;
      } else {
          sample_size = 0;
          avio_rb24(pb); /* reserved */
          field_size = avio_r8(pb);
      }
      entries = avio_rb32(pb);
  
      av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);
  
      sc->sample_count = entries;
      if (sample_size)
          return 0;
  
      if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {
          av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);
          return AVERROR_INVALIDDATA;
      }
  
      if (!entries)
          return 0;
      if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)
          return AVERROR_INVALIDDATA;
      sc->sample_sizes = av_malloc(entries * sizeof(int));
      if (!sc->sample_sizes)
          return AVERROR(ENOMEM);
  
      num_bytes = (entries*field_size+4)>>3;
  
      buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);
      if (!buf) {
          av_freep(&sc->sample_sizes);
          return AVERROR(ENOMEM);
      }
  
      if (avio_read(pb, buf, num_bytes) < num_bytes) {
          av_freep(&sc->sample_sizes);
          av_free(buf);
          return AVERROR_INVALIDDATA;
      }
  
      init_get_bits(&gb, buf, 8*num_bytes);
  
      for (i = 0; i < entries && !pb->eof_reached; i++) {
          sc->sample_sizes[i] = get_bits_long(&gb, field_size);
          sc->data_size += sc->sample_sizes[i];
      }
  
      sc->sample_count = i;
  
      if (pb->eof_reached)
          return AVERROR_EOF;
  
      av_free(buf);
      return 0;
  }
  
  static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      unsigned int i, entries;
      int64_t duration=0;
      int64_t total_sample_count=0;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
      entries = avio_rb32(pb);
  
      av_dlog(c->fc, "track[%i].stts.entries = %i\n",
              c->fc->nb_streams-1, entries);
  
      if (entries >= UINT_MAX / sizeof(*sc->stts_data))
          return -1;
  
      sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));
      if (!sc->stts_data)
          return AVERROR(ENOMEM);
  
      for (i = 0; i < entries && !pb->eof_reached; i++) {
          int sample_duration;
          int sample_count;
  
          sample_count=avio_rb32(pb);
          sample_duration = avio_rb32(pb);
          /* sample_duration < 0 is invalid based on the spec */
          if (sample_duration < 0) {
              av_log(c->fc, AV_LOG_ERROR, "Invalid SampleDelta in STTS %d\n", sample_duration);
              sample_duration = 1;
          }
          sc->stts_data[i].count= sample_count;
          sc->stts_data[i].duration= sample_duration;
  
          av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",
                  sample_count, sample_duration);
  
          duration+=(int64_t)sample_duration*sample_count;
          total_sample_count+=sample_count;
      }
  
      sc->stts_count = i;
  
      if (pb->eof_reached)
          return AVERROR_EOF;
  
      st->nb_frames= total_sample_count;
      if (duration)
          st->duration= duration;
      sc->track_end = duration;
      return 0;
  }
  
  static void mov_update_dts_shift(MOVStreamContext *sc, int duration)
  {
      if (duration < 0) {
          sc->dts_shift = FFMAX(sc->dts_shift, -duration);
      }
  }
  
  static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      unsigned int i, entries;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
      entries = avio_rb32(pb);
  
      av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
  
      if (!entries)
          return 0;
      if (entries >= UINT_MAX / sizeof(*sc->ctts_data))
          return AVERROR_INVALIDDATA;
      sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));
      if (!sc->ctts_data)
          return AVERROR(ENOMEM);
  
      for (i = 0; i < entries && !pb->eof_reached; i++) {
          int count    =avio_rb32(pb);
          int duration =avio_rb32(pb);
  
          sc->ctts_data[i].count   = count;
          sc->ctts_data[i].duration= duration;
  
          av_dlog(c->fc, "count=%d, duration=%d\n",
                  count, duration);
  
          if (FFABS(duration) > (1<<28) && i+2<entries) {
              av_log(c->fc, AV_LOG_WARNING, "CTTS invalid\n");
              av_freep(&sc->ctts_data);
              sc->ctts_count = 0;
              return 0;
          }
  
          if (i+2<entries)
              mov_update_dts_shift(sc, duration);
      }
  
      sc->ctts_count = i;
  
      if (pb->eof_reached)
          return AVERROR_EOF;
  
      av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);
  
      return 0;
  }
  
  static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      unsigned int i, entries;
      uint8_t version;
      uint32_t grouping_type;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      version = avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
      grouping_type = avio_rl32(pb);
      if (grouping_type != MKTAG( 'r','a','p',' '))
          return 0; /* only support 'rap ' grouping */
      if (version == 1)
          avio_rb32(pb); /* grouping_type_parameter */
  
      entries = avio_rb32(pb);
      if (!entries)
          return 0;
      if (entries >= UINT_MAX / sizeof(*sc->rap_group))
          return AVERROR_INVALIDDATA;
      sc->rap_group = av_malloc(entries * sizeof(*sc->rap_group));
      if (!sc->rap_group)
          return AVERROR(ENOMEM);
  
      for (i = 0; i < entries && !pb->eof_reached; i++) {
          sc->rap_group[i].count = avio_rb32(pb); /* sample_count */
          sc->rap_group[i].index = avio_rb32(pb); /* group_description_index */
      }
  
      sc->rap_group_count = i;
  
      return pb->eof_reached ? AVERROR_EOF : 0;
  }
  
  static void mov_build_index(MOVContext *mov, AVStream *st)
  {
      MOVStreamContext *sc = st->priv_data;
      int64_t current_offset;
      int64_t current_dts = 0;
      unsigned int stts_index = 0;
      unsigned int stsc_index = 0;
      unsigned int stss_index = 0;
      unsigned int stps_index = 0;
      unsigned int i, j;
      uint64_t stream_size = 0;
      AVIndexEntry *mem;
  
      /* adjust first dts according to edit list */
      if ((sc->empty_duration || sc->start_time) && mov->time_scale > 0) {
          if (sc->empty_duration)
              sc->empty_duration = av_rescale(sc->empty_duration, sc->time_scale, mov->time_scale);
          sc->time_offset = sc->start_time - sc->empty_duration;
          current_dts = -sc->time_offset;
          if (sc->ctts_count>0 && sc->stts_count>0 &&
              sc->ctts_data[0].duration / FFMAX(sc->stts_data[0].duration, 1) > 16) {
              /* more than 16 frames delay, dts are likely wrong
                 this happens with files created by iMovie */
              sc->wrong_dts = 1;
              st->codec->has_b_frames = 1;
          }
      }
  
      /* only use old uncompressed audio chunk demuxing when stts specifies it */
      if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
            sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {
          unsigned int current_sample = 0;
          unsigned int stts_sample = 0;
          unsigned int sample_size;
          unsigned int distance = 0;
          unsigned int rap_group_index = 0;
          unsigned int rap_group_sample = 0;
          int rap_group_present = sc->rap_group_count && sc->rap_group;
          int key_off = (sc->keyframe_count && sc->keyframes[0] > 0) || (sc->stps_count && sc->stps_data[0] > 0);
  
          current_dts -= sc->dts_shift;
  
          if (!sc->sample_count || st->nb_index_entries)
              return;
          if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
              return;
          mem = av_realloc(st->index_entries, (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries));
          if (!mem)
              return;
          st->index_entries = mem;
          st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);
  
          for (i = 0; i < sc->chunk_count; i++) {
              int64_t next_offset = i+1 < sc->chunk_count ? sc->chunk_offsets[i+1] : INT64_MAX;
              current_offset = sc->chunk_offsets[i];
              while (stsc_index + 1 < sc->stsc_count &&
                  i + 1 == sc->stsc_data[stsc_index + 1].first)
                  stsc_index++;
  
              if (next_offset > current_offset && sc->sample_size>0 && sc->sample_size < sc->stsz_sample_size &&
                  sc->stsc_data[stsc_index].count * (int64_t)sc->stsz_sample_size > next_offset - current_offset) {
                  av_log(mov->fc, AV_LOG_WARNING, "STSZ sample size %d invalid (too large), ignoring\n", sc->stsz_sample_size);
                  sc->stsz_sample_size = sc->sample_size;
              }
              if (sc->stsz_sample_size>0 && sc->stsz_sample_size < sc->sample_size) {
                  av_log(mov->fc, AV_LOG_WARNING, "STSZ sample size %d invalid (too small), ignoring\n", sc->stsz_sample_size);
                  sc->stsz_sample_size = sc->sample_size;
              }
  
              for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {
                  int keyframe = 0;
                  if (current_sample >= sc->sample_count) {
                      av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");
                      return;
                  }
  
                  if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {
                      keyframe = 1;
                      if (stss_index + 1 < sc->keyframe_count)
                          stss_index++;
                  } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {
                      keyframe = 1;
                      if (stps_index + 1 < sc->stps_count)
                          stps_index++;
                  }
                  if (rap_group_present && rap_group_index < sc->rap_group_count) {
                      if (sc->rap_group[rap_group_index].index > 0)
                          keyframe = 1;
                      if (++rap_group_sample == sc->rap_group[rap_group_index].count) {
                          rap_group_sample = 0;
                          rap_group_index++;
                      }
                  }
                  if (keyframe)
                      distance = 0;
                  sample_size = sc->stsz_sample_size > 0 ? sc->stsz_sample_size : sc->sample_sizes[current_sample];
                  if (sc->pseudo_stream_id == -1 ||
                     sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {
                      AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];
                      e->pos = current_offset;
                      e->timestamp = current_dts;
                      e->size = sample_size;
                      e->min_distance = distance;
                      e->flags = keyframe ? AVINDEX_KEYFRAME : 0;
                      av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
                              "size %d, distance %d, keyframe %d\n", st->index, current_sample,
                              current_offset, current_dts, sample_size, distance, keyframe);
                  }
  
                  current_offset += sample_size;
                  stream_size += sample_size;
                  current_dts += sc->stts_data[stts_index].duration;
                  distance++;
                  stts_sample++;
                  current_sample++;
                  if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {
                      stts_sample = 0;
                      stts_index++;
                  }
              }
          }
          if (st->duration > 0)
              st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;
      } else {
          unsigned chunk_samples, total = 0;
  
          // compute total chunk count
          for (i = 0; i < sc->stsc_count; i++) {
              unsigned count, chunk_count;
  
              chunk_samples = sc->stsc_data[i].count;
              if (i != sc->stsc_count - 1 &&
                  sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {
                  av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");
                  return;
              }
  
              if (sc->samples_per_frame >= 160) { // gsm
                  count = chunk_samples / sc->samples_per_frame;
              } else if (sc->samples_per_frame > 1) {
                  unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;
                  count = (chunk_samples+samples-1) / samples;
              } else {
                  count = (chunk_samples+1023) / 1024;
              }
  
              if (i < sc->stsc_count - 1)
                  chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;
              else
                  chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);
              total += chunk_count * count;
          }
  
          av_dlog(mov->fc, "chunk count %d\n", total);
          if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
              return;
          mem = av_realloc(st->index_entries, (st->nb_index_entries + total) * sizeof(*st->index_entries));
          if (!mem)
              return;
          st->index_entries = mem;
          st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);
  
          // populate index
          for (i = 0; i < sc->chunk_count; i++) {
              current_offset = sc->chunk_offsets[i];
              if (stsc_index + 1 < sc->stsc_count &&
                  i + 1 == sc->stsc_data[stsc_index + 1].first)
                  stsc_index++;
              chunk_samples = sc->stsc_data[stsc_index].count;
  
              while (chunk_samples > 0) {
                  AVIndexEntry *e;
                  unsigned size, samples;
  
                  if (sc->samples_per_frame >= 160) { // gsm
                      samples = sc->samples_per_frame;
                      size = sc->bytes_per_frame;
                  } else {
                      if (sc->samples_per_frame > 1) {
                          samples = FFMIN((1024 / sc->samples_per_frame)*
                                          sc->samples_per_frame, chunk_samples);
                          size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;
                      } else {
                          samples = FFMIN(1024, chunk_samples);
                          size = samples * sc->sample_size;
                      }
                  }
  
                  if (st->nb_index_entries >= total) {
                      av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);
                      return;
                  }
                  e = &st->index_entries[st->nb_index_entries++];
                  e->pos = current_offset;
                  e->timestamp = current_dts;
                  e->size = size;
                  e->min_distance = 0;
                  e->flags = AVINDEX_KEYFRAME;
                  av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "
                          "size %d, duration %d\n", st->index, i, current_offset, current_dts,
                          size, samples);
  
                  current_offset += size;
                  current_dts += samples;
                  chunk_samples -= samples;
              }
          }
      }
  }
  
  static int mov_open_dref(AVIOContext **pb, const char *src, MOVDref *ref,
                           AVIOInterruptCB *int_cb, int use_absolute_path, AVFormatContext *fc)
  {
      /* try relative path, we do not try the absolute because it can leak information about our
         system to an attacker */
      if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {
          char filename[1024];
          const char *src_path;
          int i, l;
  
          /* find a source dir */
          src_path = strrchr(src, '/');
          if (src_path)
              src_path++;
          else
              src_path = src;
  
          /* find a next level down to target */
          for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)
              if (ref->path[l] == '/') {
                  if (i == ref->nlvl_to - 1)
                      break;
                  else
                      i++;
              }
  
          /* compose filename if next level down to target was found */
          if (i == ref->nlvl_to - 1 && src_path - src  < sizeof(filename)) {
              memcpy(filename, src, src_path - src);
              filename[src_path - src] = 0;
  
              for (i = 1; i < ref->nlvl_from; i++)
                  av_strlcat(filename, "../", 1024);
  
              av_strlcat(filename, ref->path + l + 1, 1024);
  
              if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))
                  return 0;
          }
      } else if (use_absolute_path) {
          av_log(fc, AV_LOG_WARNING, "Using absolute path on user request, "
                 "this is a possible security issue\n");
          if (!avio_open2(pb, ref->path, AVIO_FLAG_READ, int_cb, NULL))
              return 0;
      }
  
      return AVERROR(ENOENT);
  }
  
  static void fix_timescale(MOVContext *c, MOVStreamContext *sc)
  {
      if (sc->time_scale <= 0) {
          av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", sc->ffindex);
          sc->time_scale = c->time_scale;
          if (sc->time_scale <= 0)
              sc->time_scale = 1;
      }
  }
  
  static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      AVStream *st;
      MOVStreamContext *sc;
      int ret;
  
      st = avformat_new_stream(c->fc, NULL);
      if (!st) return AVERROR(ENOMEM);
      st->id = c->fc->nb_streams;
      sc = av_mallocz(sizeof(MOVStreamContext));
      if (!sc) return AVERROR(ENOMEM);
  
      st->priv_data = sc;
      st->codec->codec_type = AVMEDIA_TYPE_DATA;
      sc->ffindex = st->index;
  
      if ((ret = mov_read_default(c, pb, atom)) < 0)
          return ret;
  
      /* sanity checks */
      if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||
                              (!sc->sample_size && !sc->sample_count))) {
          av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",
                 st->index);
          return 0;
      }
  
      fix_timescale(c, sc);
  
      avpriv_set_pts_info(st, 64, 1, sc->time_scale);
  
      mov_build_index(c, st);
  
      if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {
          MOVDref *dref = &sc->drefs[sc->dref_id - 1];
          if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback,
              c->use_absolute_path, c->fc) < 0)
              av_log(c->fc, AV_LOG_ERROR,
                     "stream %d, error opening alias: path='%s', dir='%s', "
                     "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",
                     st->index, dref->path, dref->dir, dref->filename,
                     dref->volume, dref->nlvl_from, dref->nlvl_to);
      } else {
          sc->pb = c->fc->pb;
          sc->pb_is_copied = 1;
      }
  
      if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
          if (!st->sample_aspect_ratio.num &&
              (st->codec->width != sc->width || st->codec->height != sc->height)) {
              st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /
                                               ((double)st->codec->width * sc->height), INT_MAX);
          }
  
          if (st->duration > 0)
              av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
                        sc->time_scale*st->nb_frames, st->duration, INT_MAX);
  
  #if FF_API_R_FRAME_RATE
          if (sc->stts_count == 1 || (sc->stts_count == 2 && sc->stts_data[1].count == 1))
              av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,
                        sc->time_scale, sc->stts_data[0].duration, INT_MAX);
  #endif
      }
  
      // done for ai5q, ai52, ai55, ai1q, ai12 and ai15.
      if (!st->codec->extradata_size && st->codec->codec_id == AV_CODEC_ID_H264 &&
          st->codec->codec_tag != MKTAG('a', 'v', 'c', '1')) {
          ff_generate_avci_extradata(st);
      }
  
      switch (st->codec->codec_id) {
  #if CONFIG_H261_DECODER
      case AV_CODEC_ID_H261:
  #endif
  #if CONFIG_H263_DECODER
      case AV_CODEC_ID_H263:
  #endif
  #if CONFIG_MPEG4_DECODER
      case AV_CODEC_ID_MPEG4:
  #endif
          st->codec->width = 0; /* let decoder init width/height */
          st->codec->height= 0;
          break;
      }
  
      /* Do not need those anymore. */
      av_freep(&sc->chunk_offsets);
      av_freep(&sc->stsc_data);
      av_freep(&sc->sample_sizes);
      av_freep(&sc->keyframes);
      av_freep(&sc->stts_data);
      av_freep(&sc->stps_data);
      av_freep(&sc->rap_group);
  
      return 0;
  }
  
  static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      int ret;
      c->itunes_metadata = 1;
      ret = mov_read_default(c, pb, atom);
      c->itunes_metadata = 0;
      return ret;
  }
  
  static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      while (atom.size > 8) {
          uint32_t tag = avio_rl32(pb);
          atom.size -= 4;
          if (tag == MKTAG('h','d','l','r')) {
              avio_seek(pb, -8, SEEK_CUR);
              atom.size += 8;
              return mov_read_default(c, pb, atom);
          }
      }
      return 0;
  }
  
  static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      int i;
      int width;
      int height;
      int64_t disp_transform[2];
      int display_matrix[3][2];
      AVStream *st;
      MOVStreamContext *sc;
      int version;
  
      if (c->fc->nb_streams < 1)
          return 0;
      st = c->fc->streams[c->fc->nb_streams-1];
      sc = st->priv_data;
  
      version = avio_r8(pb);
      avio_rb24(pb); /* flags */
      /*
      MOV_TRACK_ENABLED 0x0001
      MOV_TRACK_IN_MOVIE 0x0002
      MOV_TRACK_IN_PREVIEW 0x0004
      MOV_TRACK_IN_POSTER 0x0008
      */
  
      if (version == 1) {
          avio_rb64(pb);
          avio_rb64(pb);
      } else {
          avio_rb32(pb); /* creation time */
          avio_rb32(pb); /* modification time */
      }
      st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/
      avio_rb32(pb); /* reserved */
  
      /* highlevel (considering edits) duration in movie timebase */
      (version == 1) ? avio_rb64(pb) : avio_rb32(pb);
      avio_rb32(pb); /* reserved */
      avio_rb32(pb); /* reserved */
  
      avio_rb16(pb); /* layer */
      avio_rb16(pb); /* alternate group */
      avio_rb16(pb); /* volume */
      avio_rb16(pb); /* reserved */
  
      //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)
      // they're kept in fixed point format through all calculations
      // ignore u,v,z b/c we don't need the scale factor to calc aspect ratio
      for (i = 0; i < 3; i++) {
          display_matrix[i][0] = avio_rb32(pb);   // 16.16 fixed point
          display_matrix[i][1] = avio_rb32(pb);   // 16.16 fixed point
          avio_rb32(pb);           // 2.30 fixed point (not used)
      }
  
      width = avio_rb32(pb);       // 16.16 fixed point track width
      height = avio_rb32(pb);      // 16.16 fixed point track height
      sc->width = width >> 16;
      sc->height = height >> 16;
  
      //Assign clockwise rotate values based on transform matrix so that
      //we can compensate for iPhone orientation during capture.
  
      if (display_matrix[1][0] == -65536 && display_matrix[0][1] == 65536) {
           av_dict_set(&st->metadata, "rotate", "90", 0);
      }
  
      if (display_matrix[0][0] == -65536 && display_matrix[1][1] == -65536) {
           av_dict_set(&st->metadata, "rotate", "180", 0);
      }
  
      if (display_matrix[1][0] == 65536 && display_matrix[0][1] == -65536) {
           av_dict_set(&st->metadata, "rotate", "270", 0);
      }
  
      // transform the display width/height according to the matrix
      // skip this if the display matrix is the default identity matrix
      // or if it is rotating the picture, ex iPhone 3GS
      // to keep the same scale, use [width height 1<<16]
      if (width && height &&
          ((display_matrix[0][0] != 65536  ||
            display_matrix[1][1] != 65536) &&
           !display_matrix[0][1] &&
           !display_matrix[1][0] &&
           !display_matrix[2][0] && !display_matrix[2][1])) {
          for (i = 0; i < 2; i++)
              disp_transform[i] =
                  (int64_t)  width  * display_matrix[0][i] +
                  (int64_t)  height * display_matrix[1][i] +
                  ((int64_t) display_matrix[2][i] << 16);
  
          //sample aspect ratio is new width/height divided by old width/height
          st->sample_aspect_ratio = av_d2q(
              ((double) disp_transform[0] * height) /
              ((double) disp_transform[1] * width), INT_MAX);
      }
      return 0;
  }
  
  static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      MOVFragment *frag = &c->fragment;
      MOVTrackExt *trex = NULL;
      int flags, track_id, i;
  
      avio_r8(pb); /* version */
      flags = avio_rb24(pb);
  
      track_id = avio_rb32(pb);
      if (!track_id)
          return AVERROR_INVALIDDATA;
      frag->track_id = track_id;
      for (i = 0; i < c->trex_count; i++)
          if (c->trex_data[i].track_id == frag->track_id) {
              trex = &c->trex_data[i];
              break;
          }
      if (!trex) {
          av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");
          return AVERROR_INVALIDDATA;
      }
  
      frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?
                               avio_rb64(pb) : frag->moof_offset;
      frag->stsd_id  = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;
  
      frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?
                       avio_rb32(pb) : trex->duration;
      frag->size     = flags & MOV_TFHD_DEFAULT_SIZE ?
                       avio_rb32(pb) : trex->size;
      frag->flags    = flags & MOV_TFHD_DEFAULT_FLAGS ?
                       avio_rb32(pb) : trex->flags;
      av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);
      return 0;
  }
  
  static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      c->chapter_track = avio_rb32(pb);
      return 0;
  }
  
  static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      MOVTrackExt *trex;
  
      if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))
          return AVERROR_INVALIDDATA;
      trex = av_realloc(c->trex_data, (c->trex_count+1)*sizeof(*c->trex_data));
      if (!trex)
          return AVERROR(ENOMEM);
  
      c->fc->duration = AV_NOPTS_VALUE; // the duration from mvhd is not representing the whole file when fragments are used.
  
      c->trex_data = trex;
      trex = &c->trex_data[c->trex_count++];
      avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
      trex->track_id = avio_rb32(pb);
      trex->stsd_id  = avio_rb32(pb);
      trex->duration = avio_rb32(pb);
      trex->size     = avio_rb32(pb);
      trex->flags    = avio_rb32(pb);
      return 0;
  }
  
  static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      MOVFragment *frag = &c->fragment;
      AVStream *st = NULL;
      MOVStreamContext *sc;
      MOVStts *ctts_data;
      uint64_t offset;
      int64_t dts;
      int data_offset = 0;
      unsigned entries, first_sample_flags = frag->flags;
      int flags, distance, i, found_keyframe = 0;
  
      for (i = 0; i < c->fc->nb_streams; i++) {
          if (c->fc->streams[i]->id == frag->track_id) {
              st = c->fc->streams[i];
              break;
          }
      }
      if (!st) {
          av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);
          return AVERROR_INVALIDDATA;
      }
      sc = st->priv_data;
      if (sc->pseudo_stream_id+1 != frag->stsd_id)
          return 0;
      avio_r8(pb); /* version */
      flags = avio_rb24(pb);
      entries = avio_rb32(pb);
      av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);
  
      /* Always assume the presence of composition time offsets.
       * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.
       *  1) in the initial movie, there are no samples.
       *  2) in the first movie fragment, there is only one sample without composition time offset.
       *  3) in the subsequent movie fragments, there are samples with composition time offset. */
      if (!sc->ctts_count && sc->sample_count)
      {
          /* Complement ctts table if moov atom doesn't have ctts atom. */
          ctts_data = av_malloc(sizeof(*sc->ctts_data));
          if (!ctts_data)
              return AVERROR(ENOMEM);
          sc->ctts_data = ctts_data;
          sc->ctts_data[sc->ctts_count].count = sc->sample_count;
          sc->ctts_data[sc->ctts_count].duration = 0;
          sc->ctts_count++;
      }
      if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))
          return AVERROR_INVALIDDATA;
      ctts_data = av_realloc(sc->ctts_data,
                             (entries+sc->ctts_count)*sizeof(*sc->ctts_data));
      if (!ctts_data)
          return AVERROR(ENOMEM);
      sc->ctts_data = ctts_data;
  
      if (flags & MOV_TRUN_DATA_OFFSET)        data_offset        = avio_rb32(pb);
      if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);
      dts    = sc->track_end - sc->time_offset;
      offset = frag->base_data_offset + data_offset;
      distance = 0;
      av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);
      for (i = 0; i < entries && !pb->eof_reached; i++) {
          unsigned sample_size = frag->size;
          int sample_flags = i ? frag->flags : first_sample_flags;
          unsigned sample_duration = frag->duration;
          int keyframe = 0;
  
          if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);
          if (flags & MOV_TRUN_SAMPLE_SIZE)     sample_size     = avio_rb32(pb);
          if (flags & MOV_TRUN_SAMPLE_FLAGS)    sample_flags    = avio_rb32(pb);
          sc->ctts_data[sc->ctts_count].count = 1;
          sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?
                                                    avio_rb32(pb) : 0;
          mov_update_dts_shift(sc, sc->ctts_data[sc->ctts_count].duration);
          sc->ctts_count++;
          if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
              keyframe = 1;
          else if (!found_keyframe)
              keyframe = found_keyframe =
                  !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |
                                    MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));
          if (keyframe)
              distance = 0;
          av_add_index_entry(st, offset, dts, sample_size, distance,
                             keyframe ? AVINDEX_KEYFRAME : 0);
          av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
                  "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,
                  offset, dts, sample_size, distance, keyframe);
          distance++;
          dts += sample_duration;
          offset += sample_size;
          sc->data_size += sample_size;
      }
  
      if (pb->eof_reached)
          return AVERROR_EOF;
  
      frag->moof_offset = offset;
      st->duration = sc->track_end = dts + sc->time_offset;
      return 0;
  }
  
  /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
  /* like the files created with Adobe Premiere 5.0, for samples see */
  /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
  static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      int err;
  
      if (atom.size < 8)
          return 0; /* continue */
      if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
          avio_skip(pb, atom.size - 4);
          return 0;
      }
      atom.type = avio_rl32(pb);
      atom.size -= 8;
      if (atom.type != MKTAG('m','d','a','t')) {
          avio_skip(pb, atom.size);
          return 0;
      }
      err = mov_read_mdat(c, pb, atom);
      return err;
  }
  
  static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
  #if CONFIG_ZLIB
      AVIOContext ctx;
      uint8_t *cmov_data;
      uint8_t *moov_data; /* uncompressed data */
      long cmov_len, moov_len;
      int ret = -1;
  
      avio_rb32(pb); /* dcom atom */
      if (avio_rl32(pb) != MKTAG('d','c','o','m'))
          return AVERROR_INVALIDDATA;
      if (avio_rl32(pb) != MKTAG('z','l','i','b')) {
          av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !\n");
          return AVERROR_INVALIDDATA;
      }
      avio_rb32(pb); /* cmvd atom */
      if (avio_rl32(pb) != MKTAG('c','m','v','d'))
          return AVERROR_INVALIDDATA;
      moov_len = avio_rb32(pb); /* uncompressed size */
      cmov_len = atom.size - 6 * 4;
  
      cmov_data = av_malloc(cmov_len);
      if (!cmov_data)
          return AVERROR(ENOMEM);
      moov_data = av_malloc(moov_len);
      if (!moov_data) {
          av_free(cmov_data);
          return AVERROR(ENOMEM);
      }
      avio_read(pb, cmov_data, cmov_len);
      if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)
          goto free_and_return;
      if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)
          goto free_and_return;
      atom.type = MKTAG('m','o','o','v');
      atom.size = moov_len;
      ret = mov_read_default(c, &ctx, atom);
  free_and_return:
      av_free(moov_data);
      av_free(cmov_data);
      return ret;
  #else
      av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
      return AVERROR(ENOSYS);
  #endif
  }
  
  /* edit list atom */
  static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      MOVStreamContext *sc;
      int i, edit_count, version, edit_start_index = 0;
      int unsupported = 0;
  
      if (c->fc->nb_streams < 1 || c->ignore_editlist)
          return 0;
      sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;
  
      version = avio_r8(pb); /* version */
      avio_rb24(pb); /* flags */
      edit_count = avio_rb32(pb); /* entries */
  
      if ((uint64_t)edit_count*12+8 > atom.size)
          return AVERROR_INVALIDDATA;
  
      av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);
      for (i=0; i<edit_count; i++){
          int64_t time;
          int64_t duration;
          int rate;
          if (version == 1) {
              duration = avio_rb64(pb);
              time     = avio_rb64(pb);
          } else {
              duration = avio_rb32(pb); /* segment duration */
              time     = (int32_t)avio_rb32(pb); /* media time */
          }
          rate = avio_rb32(pb);
          if (i == 0 && time == -1) {
              sc->empty_duration = duration;
              edit_start_index = 1;
          } else if (i == edit_start_index && time >= 0)
              sc->start_time = time;
          else
              unsupported = 1;
  
          av_dlog(c->fc, "duration=%"PRId64" time=%"PRId64" rate=%f\n",
                  duration, time, rate / 65536.0);
      }
  
      if (unsupported)
          av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "
                 "a/v desync might occur, patch welcome\n");
  
      return 0;
  }
  
  static int mov_read_tmcd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      MOVStreamContext *sc;
  
      if (c->fc->nb_streams < 1)
          return AVERROR_INVALIDDATA;
      sc = c->fc->streams[c->fc->nb_streams - 1]->priv_data;
      sc->timecode_track = avio_rb32(pb);
      return 0;
  }
  
  static int mov_read_uuid(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      int ret;
      uint8_t uuid[16];
      static const uint8_t uuid_isml_manifest[] = {
          0xa5, 0xd4, 0x0b, 0x30, 0xe8, 0x14, 0x11, 0xdd,
          0xba, 0x2f, 0x08, 0x00, 0x20, 0x0c, 0x9a, 0x66
      };
  
      if (atom.size < sizeof(uuid) || atom.size == INT64_MAX)
          return AVERROR_INVALIDDATA;
  
      ret = avio_read(pb, uuid, sizeof(uuid));
      if (ret < 0) {
          return ret;
      } else if (ret != sizeof(uuid)) {
          return AVERROR_INVALIDDATA;
      }
      if (!memcmp(uuid, uuid_isml_manifest, sizeof(uuid))) {
          uint8_t *buffer, *ptr;
          char *endptr;
          size_t len = atom.size - sizeof(uuid);
  
          if (len < 4) {
              return AVERROR_INVALIDDATA;
          }
          ret = avio_skip(pb, 4); // zeroes
          len -= 4;
  
          buffer = av_mallocz(len + 1);
          if (!buffer) {
              return AVERROR(ENOMEM);
          }
          ret = avio_read(pb, buffer, len);
          if (ret < 0) {
              av_free(buffer);
              return ret;
          } else if (ret != len) {
              av_free(buffer);
              return AVERROR_INVALIDDATA;
          }
  
          ptr = buffer;
          while ((ptr = av_stristr(ptr, "systemBitrate=\"")) != NULL) {
              ptr += sizeof("systemBitrate=\"") - 1;
              c->bitrates_count++;
              c->bitrates = av_realloc_f(c->bitrates, c->bitrates_count, sizeof(*c->bitrates));
              if (!c->bitrates) {
                  c->bitrates_count = 0;
                  av_free(buffer);
                  return AVERROR(ENOMEM);
              }
              errno = 0;
              ret = strtol(ptr, &endptr, 10);
              if (ret < 0 || errno || *endptr != '"') {
                  c->bitrates[c->bitrates_count - 1] = 0;
              } else {
                  c->bitrates[c->bitrates_count - 1] = ret;
              }
          }
  
          av_free(buffer);
      }
      return 0;
  }
  
  static const MOVParseTableEntry mov_default_parse_table[] = {
  { MKTAG('A','C','L','R'), mov_read_avid },
  { MKTAG('A','P','R','G'), mov_read_avid },
  { MKTAG('A','A','L','P'), mov_read_avid },
  { MKTAG('A','R','E','S'), mov_read_ares },
  { MKTAG('a','v','s','s'), mov_read_avss },
  { MKTAG('c','h','p','l'), mov_read_chpl },
  { MKTAG('c','o','6','4'), mov_read_stco },
  { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */
  { MKTAG('d','i','n','f'), mov_read_default },
  { MKTAG('d','r','e','f'), mov_read_dref },
  { MKTAG('e','d','t','s'), mov_read_default },
  { MKTAG('e','l','s','t'), mov_read_elst },
  { MKTAG('e','n','d','a'), mov_read_enda },
  { MKTAG('f','i','e','l'), mov_read_fiel },
  { MKTAG('f','t','y','p'), mov_read_ftyp },
  { MKTAG('g','l','b','l'), mov_read_glbl },
  { MKTAG('h','d','l','r'), mov_read_hdlr },
  { MKTAG('i','l','s','t'), mov_read_ilst },
  { MKTAG('j','p','2','h'), mov_read_jp2h },
  { MKTAG('m','d','a','t'), mov_read_mdat },
  { MKTAG('m','d','h','d'), mov_read_mdhd },
  { MKTAG('m','d','i','a'), mov_read_default },
  { MKTAG('m','e','t','a'), mov_read_meta },
  { MKTAG('m','i','n','f'), mov_read_default },
  { MKTAG('m','o','o','f'), mov_read_moof },
  { MKTAG('m','o','o','v'), mov_read_moov },
  { MKTAG('m','v','e','x'), mov_read_default },
  { MKTAG('m','v','h','d'), mov_read_mvhd },
  { MKTAG('S','M','I',' '), mov_read_svq3 },
  { MKTAG('a','l','a','c'), mov_read_alac }, /* alac specific atom */
  { MKTAG('a','v','c','C'), mov_read_glbl },
  { MKTAG('p','a','s','p'), mov_read_pasp },
  { MKTAG('s','t','b','l'), mov_read_default },
  { MKTAG('s','t','c','o'), mov_read_stco },
  { MKTAG('s','t','p','s'), mov_read_stps },
  { MKTAG('s','t','r','f'), mov_read_strf },
  { MKTAG('s','t','s','c'), mov_read_stsc },
  { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */
  { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */
  { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */
  { MKTAG('s','t','t','s'), mov_read_stts },
  { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */
  { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */
  { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */
  { MKTAG('t','r','a','k'), mov_read_trak },
  { MKTAG('t','r','a','f'), mov_read_default },
  { MKTAG('t','r','e','f'), mov_read_default },
  { MKTAG('t','m','c','d'), mov_read_tmcd },
  { MKTAG('c','h','a','p'), mov_read_chap },
  { MKTAG('t','r','e','x'), mov_read_trex },
  { MKTAG('t','r','u','n'), mov_read_trun },
  { MKTAG('u','d','t','a'), mov_read_default },
  { MKTAG('w','a','v','e'), mov_read_wave },
  { MKTAG('e','s','d','s'), mov_read_esds },
  { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */
  { MKTAG('d','e','c','3'), mov_read_dec3 }, /* EAC-3 info */
  { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */
  { MKTAG('w','f','e','x'), mov_read_wfex },
  { MKTAG('c','m','o','v'), mov_read_cmov },
  { MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */
  { MKTAG('d','v','c','1'), mov_read_dvc1 },
  { MKTAG('s','b','g','p'), mov_read_sbgp },
  { MKTAG('u','u','i','d'), mov_read_uuid },
  { 0, NULL }
  };
  
  static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
  {
      int64_t total_size = 0;
      MOVAtom a;
      int i;
  
      if (atom.size < 0)
          atom.size = INT64_MAX;
      while (total_size + 8 <= atom.size && !url_feof(pb)) {
          int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;
          a.size = atom.size;
          a.type=0;
          if (atom.size >= 8) {
              a.size = avio_rb32(pb);
              a.type = avio_rl32(pb);
              if (atom.type != MKTAG('r','o','o','t') &&
                  atom.type != MKTAG('m','o','o','v'))
              {
                  if (a.type == MKTAG('t','r','a','k') || a.type == MKTAG('m','d','a','t'))
                  {
                      av_log(c->fc, AV_LOG_ERROR, "Broken file, trak/mdat not at top-level\n");
                      avio_skip(pb, -8);
                      return 0;
                  }
              }
              total_size += 8;
              if (a.size == 1) { /* 64 bit extended size */
                  a.size = avio_rb64(pb) - 8;
                  total_size += 8;
              }
          }
          av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",
                  a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);
          if (a.size == 0) {
              a.size = atom.size - total_size + 8;
          }
          a.size -= 8;
          if (a.size < 0)
              break;
          a.size = FFMIN(a.size, atom.size - total_size);
  
          for (i = 0; mov_default_parse_table[i].type; i++)
              if (mov_default_parse_table[i].type == a.type) {
                  parse = mov_default_parse_table[i].parse;
                  break;
              }
  
          // container is user data
          if (!parse && (atom.type == MKTAG('u','d','t','a') ||
                         atom.type == MKTAG('i','l','s','t')))
              parse = mov_read_udta_string;
  
          if (!parse) { /* skip leaf atoms data */
              avio_skip(pb, a.size);
          } else {
              int64_t start_pos = avio_tell(pb);
              int64_t left;
              int err = parse(c, pb, a);
              if (err < 0)
                  return err;
              if (c->found_moov && c->found_mdat &&
                  ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||
                   start_pos + a.size == avio_size(pb))) {
                  if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)
                      c->next_root_atom = start_pos + a.size;
                  return 0;
              }
              left = a.size - avio_tell(pb) + start_pos;
              if (left > 0) /* skip garbage at atom end */
                  avio_skip(pb, left);
              else if (left < 0) {
                  av_log(c->fc, AV_LOG_WARNING,
                         "overread end of atom '%.4s' by %"PRId64" bytes\n",
                         (char*)&a.type, -left);
                  avio_seek(pb, left, SEEK_CUR);
              }
          }
  
          total_size += a.size;
      }
  
      if (total_size < atom.size && atom.size < 0x7ffff)
          avio_skip(pb, atom.size - total_size);
  
      return 0;
  }
  
  static int mov_probe(AVProbeData *p)
  {
      int64_t offset;
      uint32_t tag;
      int score = 0;
      int moov_offset = -1;
  
      /* check file header */
      offset = 0;
      for (;;) {
          /* ignore invalid offset */
          if ((offset + 8) > (unsigned int)p->buf_size)
              break;
          tag = AV_RL32(p->buf + offset + 4);
          switch(tag) {
          /* check for obvious tags */
          case MKTAG('m','o','o','v'):
              moov_offset = offset + 4;
          case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */
          case MKTAG('m','d','a','t'):
          case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */
          case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */
          case MKTAG('f','t','y','p'):
              if (AV_RB32(p->buf+offset) < 8 &&
                  (AV_RB32(p->buf+offset) != 1 ||
                   offset + 12 > (unsigned int)p->buf_size ||
                   AV_RB64(p->buf+offset + 8) == 0)) {
                  score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
              } else {
                  score = AVPROBE_SCORE_MAX;
              }
              offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
              break;
          /* those are more common words, so rate then a bit less */
          case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */
          case MKTAG('w','i','d','e'):
          case MKTAG('f','r','e','e'):
          case MKTAG('j','u','n','k'):
          case MKTAG('p','i','c','t'):
              score  = FFMAX(score, AVPROBE_SCORE_MAX - 5);
              offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
              break;
          case MKTAG(0x82,0x82,0x7f,0x7d):
          case MKTAG('s','k','i','p'):
          case MKTAG('u','u','i','d'):
          case MKTAG('p','r','f','l'):
              /* if we only find those cause probedata is too small at least rate them */
              score  = FFMAX(score, AVPROBE_SCORE_EXTENSION);
              offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
              break;
          default:
              offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
          }
      }
      if(score > AVPROBE_SCORE_MAX - 50 && moov_offset != -1) {
          /* moov atom in the header - we should make sure that this is not a
           * MOV-packed MPEG-PS */
          offset = moov_offset;
  
          while(offset < (p->buf_size - 16)){ /* Sufficient space */
                 /* We found an actual hdlr atom */
              if(AV_RL32(p->buf + offset     ) == MKTAG('h','d','l','r') &&
                 AV_RL32(p->buf + offset +  8) == MKTAG('m','h','l','r') &&
                 AV_RL32(p->buf + offset + 12) == MKTAG('M','P','E','G')){
                  av_log(NULL, AV_LOG_WARNING, "Found media data tag MPEG indicating this is a MOV-packed MPEG-PS.\n");
                  /* We found a media handler reference atom describing an
                   * MPEG-PS-in-MOV, return a
                   * low score to force expanding the probe window until
                   * mpegps_probe finds what it needs */
                  return 5;
              }else
                  /* Keep looking */
                  offset+=2;
          }
      }
  
      return score;
  }
  
  // must be done after parsing all trak because there's no order requirement
  static void mov_read_chapters(AVFormatContext *s)
  {
      MOVContext *mov = s->priv_data;
      AVStream *st = NULL;
      MOVStreamContext *sc;
      int64_t cur_pos;
      int i;
  
      for (i = 0; i < s->nb_streams; i++)
          if (s->streams[i]->id == mov->chapter_track) {
              st = s->streams[i];
              break;
          }
      if (!st) {
          av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");
          return;
      }
  
      st->discard = AVDISCARD_ALL;
      sc = st->priv_data;
      cur_pos = avio_tell(sc->pb);
  
      for (i = 0; i < st->nb_index_entries; i++) {
          AVIndexEntry *sample = &st->index_entries[i];
          int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;
          uint8_t *title;
          uint16_t ch;
          int len, title_len;
  
          if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
              av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);
              goto finish;
          }
  
          // the first two bytes are the length of the title
          len = avio_rb16(sc->pb);
          if (len > sample->size-2)
              continue;
          title_len = 2*len + 1;
          if (!(title = av_mallocz(title_len)))
              goto finish;
  
          // The samples could theoretically be in any encoding if there's an encd
          // atom following, but in practice are only utf-8 or utf-16, distinguished
          // instead by the presence of a BOM
          if (!len) {
              title[0] = 0;
          } else {
              ch = avio_rb16(sc->pb);
              if (ch == 0xfeff)
                  avio_get_str16be(sc->pb, len, title, title_len);
              else if (ch == 0xfffe)
                  avio_get_str16le(sc->pb, len, title, title_len);
              else {
                  AV_WB16(title, ch);
                  if (len == 1 || len == 2)
                      title[len] = 0;
                  else
                      avio_get_str(sc->pb, INT_MAX, title + 2, len - 1);
              }
          }
  
          avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);
          av_freep(&title);
      }
  finish:
      avio_seek(sc->pb, cur_pos, SEEK_SET);
  }
  
  static int parse_timecode_in_framenum_format(AVFormatContext *s, AVStream *st,
                                               uint32_t value, int flags)
  {
      AVTimecode tc;
      char buf[AV_TIMECODE_STR_SIZE];
      AVRational rate = {st->codec->time_base.den,
                         st->codec->time_base.num};
      int ret = av_timecode_init(&tc, rate, flags, 0, s);
      if (ret < 0)
          return ret;
      av_dict_set(&st->metadata, "timecode",
                  av_timecode_make_string(&tc, buf, value), 0);
      return 0;
  }
  
  static int mov_read_timecode_track(AVFormatContext *s, AVStream *st)
  {
      MOVStreamContext *sc = st->priv_data;
      int flags = 0;
      int64_t cur_pos = avio_tell(sc->pb);
      uint32_t value;
  
      if (!st->nb_index_entries)
          return -1;
  
      avio_seek(sc->pb, st->index_entries->pos, SEEK_SET);
      value = avio_rb32(s->pb);
  
      if (sc->tmcd_flags & 0x0001) flags |= AV_TIMECODE_FLAG_DROPFRAME;
      if (sc->tmcd_flags & 0x0002) flags |= AV_TIMECODE_FLAG_24HOURSMAX;
      if (sc->tmcd_flags & 0x0004) flags |= AV_TIMECODE_FLAG_ALLOWNEGATIVE;
  
      /* Assume Counter flag is set to 1 in tmcd track (even though it is likely
       * not the case) and thus assume "frame number format" instead of QT one.
       * No sample with tmcd track can be found with a QT timecode at the moment,
       * despite what the tmcd track "suggests" (Counter flag set to 0 means QT
       * format). */
      parse_timecode_in_framenum_format(s, st, value, flags);
  
      avio_seek(sc->pb, cur_pos, SEEK_SET);
      return 0;
  }
  
  static int mov_read_close(AVFormatContext *s)
  {
      MOVContext *mov = s->priv_data;
      int i, j;
  
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *st = s->streams[i];
          MOVStreamContext *sc = st->priv_data;
  
          av_freep(&sc->ctts_data);
          for (j = 0; j < sc->drefs_count; j++) {
              av_freep(&sc->drefs[j].path);
              av_freep(&sc->drefs[j].dir);
          }
          av_freep(&sc->drefs);
          if (!sc->pb_is_copied)
              avio_close(sc->pb);
          sc->pb = NULL;
          av_freep(&sc->chunk_offsets);
          av_freep(&sc->keyframes);
          av_freep(&sc->sample_sizes);
          av_freep(&sc->stps_data);
          av_freep(&sc->stsc_data);
          av_freep(&sc->stts_data);
      }
  
      if (mov->dv_demux) {
          for (i = 0; i < mov->dv_fctx->nb_streams; i++) {
              av_freep(&mov->dv_fctx->streams[i]->codec);
              av_freep(&mov->dv_fctx->streams[i]);
          }
          av_freep(&mov->dv_fctx);
          av_freep(&mov->dv_demux);
      }
  
      av_freep(&mov->trex_data);
      av_freep(&mov->bitrates);
  
      return 0;
  }
  
  static int tmcd_is_referenced(AVFormatContext *s, int tmcd_id)
  {
      int i;
  
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *st = s->streams[i];
          MOVStreamContext *sc = st->priv_data;
  
          if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
              sc->timecode_track == tmcd_id)
              return 1;
      }
      return 0;
  }
  
  /* look for a tmcd track not referenced by any video track, and export it globally */
  static void export_orphan_timecode(AVFormatContext *s)
  {
      int i;
  
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *st = s->streams[i];
  
          if (st->codec->codec_tag  == MKTAG('t','m','c','d') &&
              !tmcd_is_referenced(s, i + 1)) {
              AVDictionaryEntry *tcr = av_dict_get(st->metadata, "timecode", NULL, 0);
              if (tcr) {
                  av_dict_set(&s->metadata, "timecode", tcr->value, 0);
                  break;
              }
          }
      }
  }
  
  static int mov_read_header(AVFormatContext *s)
  {
      MOVContext *mov = s->priv_data;
      AVIOContext *pb = s->pb;
      int i, j, err;
      MOVAtom atom = { AV_RL32("root") };
  
      mov->fc = s;
      /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
      if (pb->seekable)
          atom.size = avio_size(pb);
      else
          atom.size = INT64_MAX;
  
      /* check MOV header */
      if ((err = mov_read_default(mov, pb, atom)) < 0) {
          av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);
          mov_read_close(s);
          return err;
      }
      if (!mov->found_moov) {
          av_log(s, AV_LOG_ERROR, "moov atom not found\n");
          mov_read_close(s);
          return AVERROR_INVALIDDATA;
      }
      av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));
  
      if (pb->seekable) {
          if (mov->chapter_track > 0)
              mov_read_chapters(s);
          for (i = 0; i < s->nb_streams; i++)
              if (s->streams[i]->codec->codec_tag == AV_RL32("tmcd"))
                  mov_read_timecode_track(s, s->streams[i]);
      }
  
      /* copy timecode metadata from tmcd tracks to the related video streams */
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *st = s->streams[i];
          MOVStreamContext *sc = st->priv_data;
          if (sc->timecode_track > 0) {
              AVDictionaryEntry *tcr;
              int tmcd_st_id = -1;
  
              for (j = 0; j < s->nb_streams; j++)
                  if (s->streams[j]->id == sc->timecode_track)
                      tmcd_st_id = j;
  
              if (tmcd_st_id < 0 || tmcd_st_id == i)
                  continue;
              tcr = av_dict_get(s->streams[tmcd_st_id]->metadata, "timecode", NULL, 0);
              if (tcr)
                  av_dict_set(&st->metadata, "timecode", tcr->value, 0);
          }
      }
      export_orphan_timecode(s);
  
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *st = s->streams[i];
          MOVStreamContext *sc = st->priv_data;
          fix_timescale(mov, sc);
          if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->codec->codec_id == AV_CODEC_ID_AAC) {
              st->skip_samples = sc->start_pad;
          }
      }
  
      if (mov->trex_data) {
          for (i = 0; i < s->nb_streams; i++) {
              AVStream *st = s->streams[i];
              MOVStreamContext *sc = st->priv_data;
              if (st->duration)
                  st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;
          }
      }
  
      for (i = 0; i < mov->bitrates_count && i < s->nb_streams; i++) {
          if (mov->bitrates[i]) {
              s->streams[i]->codec->bit_rate = mov->bitrates[i];
          }
      }
  
      return 0;
  }
  
  static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)
  {
      AVIndexEntry *sample = NULL;
      int64_t best_dts = INT64_MAX;
      int i;
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *avst = s->streams[i];
          MOVStreamContext *msc = avst->priv_data;
          if (msc->pb && msc->current_sample < avst->nb_index_entries) {
              AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];
              int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);
              av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);
              if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||
                  (s->pb->seekable &&
                   ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&
                   ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||
                    (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {
                  sample = current_sample;
                  best_dts = dts;
                  *st = avst;
              }
          }
      }
      return sample;
  }
  
  static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
  {
      MOVContext *mov = s->priv_data;
      MOVStreamContext *sc;
      AVIndexEntry *sample;
      AVStream *st = NULL;
      int ret;
      mov->fc = s;
   retry:
      sample = mov_find_next_sample(s, &st);
      if (!sample) {
          mov->found_mdat = 0;
          if (!mov->next_root_atom)
              return AVERROR_EOF;
          avio_seek(s->pb, mov->next_root_atom, SEEK_SET);
          mov->next_root_atom = 0;
          if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||
              url_feof(s->pb))
              return AVERROR_EOF;
          av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));
          goto retry;
      }
      sc = st->priv_data;
      /* must be done just before reading, to avoid infinite loop on sample */
      sc->current_sample++;
  
      if (mov->next_root_atom) {
          sample->pos = FFMIN(sample->pos, mov->next_root_atom);
          sample->size = FFMIN(sample->size, (mov->next_root_atom - sample->pos));
      }
  
      if (st->discard != AVDISCARD_ALL) {
          if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
              av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",
                     sc->ffindex, sample->pos);
              return AVERROR_INVALIDDATA;
          }
          ret = av_get_packet(sc->pb, pkt, sample->size);
          if (ret < 0)
              return ret;
          if (sc->has_palette) {
              uint8_t *pal;
  
              pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
              if (!pal) {
                  av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");
              } else {
                  memcpy(pal, sc->palette, AVPALETTE_SIZE);
                  sc->has_palette = 0;
              }
          }
  #if CONFIG_DV_DEMUXER
          if (mov->dv_demux && sc->dv_audio_container) {
              avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size, pkt->pos);
              av_free(pkt->data);
              pkt->size = 0;
              ret = avpriv_dv_get_packet(mov->dv_demux, pkt);
              if (ret < 0)
                  return ret;
          }
  #endif
      }
  
      pkt->stream_index = sc->ffindex;
      pkt->dts = sample->timestamp;
      if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {
          pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;
          /* update ctts context */
          sc->ctts_sample++;
          if (sc->ctts_index < sc->ctts_count &&
              sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {
              sc->ctts_index++;
              sc->ctts_sample = 0;
          }
          if (sc->wrong_dts)
              pkt->dts = AV_NOPTS_VALUE;
      } else {
          int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?
              st->index_entries[sc->current_sample].timestamp : st->duration;
          pkt->duration = next_dts - pkt->dts;
          pkt->pts = pkt->dts;
      }
      if (st->discard == AVDISCARD_ALL)
          goto retry;
      pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;
      pkt->pos = sample->pos;
      av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",
              pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);
      return 0;
  }
  
  static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)
  {
      MOVStreamContext *sc = st->priv_data;
      int sample, time_sample;
      int i;
  
      sample = av_index_search_timestamp(st, timestamp, flags);
      av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
      if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)
          sample = 0;
      if (sample < 0) /* not sure what to do */
          return AVERROR_INVALIDDATA;
      sc->current_sample = sample;
      av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);
      /* adjust ctts index */
      if (sc->ctts_data) {
          time_sample = 0;
          for (i = 0; i < sc->ctts_count; i++) {
              int next = time_sample + sc->ctts_data[i].count;
              if (next > sc->current_sample) {
                  sc->ctts_index = i;
                  sc->ctts_sample = sc->current_sample - time_sample;
                  break;
              }
              time_sample = next;
          }
      }
      return sample;
  }
  
  static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
  {
      AVStream *st;
      int64_t seek_timestamp, timestamp;
      int sample;
      int i;
  
      if (stream_index >= s->nb_streams)
          return AVERROR_INVALIDDATA;
  
      st = s->streams[stream_index];
      sample = mov_seek_stream(s, st, sample_time, flags);
      if (sample < 0)
          return sample;
  
      /* adjust seek timestamp to found sample timestamp */
      seek_timestamp = st->index_entries[sample].timestamp;
  
      for (i = 0; i < s->nb_streams; i++) {
          MOVStreamContext *sc = s->streams[i]->priv_data;
          st = s->streams[i];
          st->skip_samples = (sample_time <= 0) ? sc->start_pad : 0;
  
          if (stream_index == i)
              continue;
  
          timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);
          mov_seek_stream(s, st, timestamp, flags);
      }
      return 0;
  }
  
  static const AVOption options[] = {
      {"use_absolute_path",
          "allow using absolute path when opening alias, this is a possible security issue",
          offsetof(MOVContext, use_absolute_path), FF_OPT_TYPE_INT, {.i64 = 0},
          0, 1, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_DECODING_PARAM},
      {"ignore_editlist", "", offsetof(MOVContext, ignore_editlist), FF_OPT_TYPE_INT, {.i64 = 0},
          0, 1, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_DECODING_PARAM},
      {NULL}
  };
  
  static const AVClass mov_class = {
      .class_name = "mov,mp4,m4a,3gp,3g2,mj2",
      .item_name  = av_default_item_name,
      .option     = options,
      .version    = LIBAVUTIL_VERSION_INT,
  };
  
  AVInputFormat ff_mov_demuxer = {
      .name           = "mov,mp4,m4a,3gp,3g2,mj2",
      .long_name      = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),
      .priv_data_size = sizeof(MOVContext),
      .read_probe     = mov_probe,
      .read_header    = mov_read_header,
      .read_packet    = mov_read_packet,
      .read_close     = mov_read_close,
      .read_seek      = mov_read_seek,
      .priv_class     = &mov_class,
      .flags          = AVFMT_NO_BYTE_SEEK,
  };
  