func: static int ipmovie_read_packet(AVFormatContext *s,
  
                                 AVPacket *pkt)
  
  {
  
      IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
  
      ByteIOContext *pb = &s->pb;
  
      int ret;
  
  
  
      ret = process_ipmovie_chunk(ipmovie, pb, pkt);
  
      if (ret == CHUNK_BAD)
  
          ret = AVERROR_INVALIDDATA;
  
      else if (ret == CHUNK_EOF)
  
          ret = AVERROR_IO;
  
      else if (ret == CHUNK_NOMEM)
  
          ret = AVERROR_NOMEM;
  
      else
  
          ret = 0;
  
  
  
      return ret;
  
  }
  