mas01cr@204: #include "audioDB.h"
mas01cr@204: 
mas01cr@204: /* Make a new database.
mas01cr@204: 
mas01cr@204:    The database consists of:
mas01cr@204: 
mas01cr@204:    * a header (see dbTableHeader struct definition);
mas01cr@204:    * keyTable: list of keys of tracks;
mas01cr@204:    * trackTable: Maps implicit feature index to a feature vector
mas01cr@204:      matrix (sizes of tracks)
mas01cr@204:    * featureTable: Lots of doubles;
mas01cr@204:    * timesTable: (start,end) time points for each feature vector;
mas01cr@204:    * powerTable: associated power for each feature vector;
mas01cr@204:    * l2normTable: squared l2norms for each feature vector.
mas01cr@204: */
mas01cr@204: 
mas01cr@204: void audioDB::create(const char* dbName){
mas01cr@204:   if ((dbfid = open (dbName, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) < 0)
mas01cr@204:     error("Can't create database file", dbName, "open");
mas01cr@204:   get_lock(dbfid, 1);
mas01cr@204: 
mas01cr@204:   if(verbosity) {
mas01cr@204:     std::cerr << "header size:" << O2_HEADERSIZE << std::endl;
mas01cr@204:   }
mas01cr@204:   
mas01cr@204:   dbH = new dbTableHeaderT();
mas01cr@204:   assert(dbH);
mas01cr@204: 
mas01cr@204:   unsigned int maxfiles = (unsigned int) rint((double) O2_MAXFILES * (double) size / (double) O2_DEFAULTDBSIZE);
mas01cr@204: 
mas01cr@204:   // Initialize header
mas01cr@204:   dbH->magic = O2_MAGIC;
mas01cr@204:   dbH->version = O2_FORMAT_VERSION;
mas01cr@204:   dbH->numFiles = 0;
mas01cr@204:   dbH->dim = 0;
mas01cr@204:   dbH->flags = 0;
mas01cr@204:   dbH->length = 0;
mas01cr@204:   dbH->fileTableOffset = ALIGN_PAGE_UP(O2_HEADERSIZE);
mas01cr@204:   dbH->trackTableOffset = ALIGN_PAGE_UP(dbH->fileTableOffset + O2_FILETABLESIZE*maxfiles);
mas01cr@204:   dbH->dataOffset = ALIGN_PAGE_UP(dbH->trackTableOffset + O2_TRACKTABLESIZE*maxfiles);
mas01cr@204:   dbH->l2normTableOffset = ALIGN_PAGE_DOWN(size - maxfiles*O2_MEANNUMVECTORS*sizeof(double));
mas01cr@204:   dbH->powerTableOffset = ALIGN_PAGE_DOWN(dbH->l2normTableOffset - maxfiles*O2_MEANNUMVECTORS*sizeof(double));
mas01cr@204:   dbH->timesTableOffset = ALIGN_PAGE_DOWN(dbH->powerTableOffset - 2*maxfiles*O2_MEANNUMVECTORS*sizeof(double));
mas01cr@204:   dbH->dbSize = size;
mas01cr@204: 
mas01cr@204:   write(dbfid, dbH, O2_HEADERSIZE);
mas01cr@204: 
mas01cr@204:   // go to the location corresponding to the last byte
mas01cr@204:   if (lseek (dbfid, size - 1, SEEK_SET) == -1)
mas01cr@204:     error("lseek error in db file", "", "lseek");
mas01cr@204: 
mas01cr@204:   // write a dummy byte at the last location
mas01cr@204:   if (write (dbfid, "", 1) != 1)
mas01cr@204:     error("write error", "", "write");
mas01cr@204:   
mas01cr@204:   if(verbosity) {
mas01cr@204:     std::cerr << COM_CREATE << " " << dbName << std::endl;
mas01cr@204:   }
mas01cr@204: }
mas01cr@204: 
mas01cr@204: void audioDB::drop(){
mas01cr@204:   // FIXME: drop something?  Should we even allow this?
mas01cr@204: }
mas01cr@204: