mas01cr@498: extern "C" {
mas01cr@498: #include "audioDB_API.h"
mas01cr@498: }
mas01cr@498: #include "audioDB-internals.h"
mas01cr@239: 
mas01cr@239: /* Make a new database.
mas01cr@239: 
mas01cr@509: (FIXME: this text, in particular the conditional, will not be true 
mas01cr@509: once we implement create flags rather than defaulting on format based
mas01cr@509: on the requested size arguments)
mas01cr@509: 
mas01cr@509: IF size(featuredata) < ADB_FIXME_LARGE_ADB_SIZE
mas01cr@239:    The database consists of:
mas01cr@239: 
mas01cr@509:    * a header (see adb_header_t definition);
mas01cr@239:    * keyTable: list of keys of tracks;
mas01cr@239:    * trackTable: Maps implicit feature index to a feature vector
mas01cr@239:      matrix (sizes of tracks)
mas01cr@239:    * featureTable: Lots of doubles;
mas01cr@239:    * timesTable: (start,end) time points for each feature vector;
mas01cr@239:    * powerTable: associated power for each feature vector;
mas01cr@239:    * l2normTable: squared l2norms for each feature vector.
mas01cr@498: 
mas01mc@324: ELSE the database consists of:
mas01cr@498: 
mas01cr@509:    * a header (see adb_header_t definition);
mas01mc@324:    * keyTable: list of keys of tracks
mas01mc@324:    * trackTable: sizes of tracks
mas01mc@324:    * featureTable: list of feature file names
mas01mc@324:    * timesTable: list of times file names
mas01mc@324:    * powerTable: list of power file names
mas01mc@324: 
mas01cr@239: */
mas01cr@239: 
mas01cr@498: adb_t *audiodb_create(const char *path, unsigned datasize, unsigned ntracks, unsigned datadim) {
mas01cr@498:   int fd;
mas01cr@498:   adb_header_t *header = 0;
mas01cr@498:   off_t databytes, auxbytes;
mas01cr@498:   if(datasize == 0) {
mas01cr@509:     datasize = ADB_DEFAULT_DATASIZE;
mas01cr@498:   }
mas01cr@498:   if(ntracks == 0) {
mas01cr@509:     ntracks = ADB_DEFAULT_NTRACKS;
mas01cr@498:   }
mas01cr@498:   if(datadim == 0) {
mas01cr@509:     datadim = ADB_DEFAULT_DATADIM;
mas01cr@498:   }
mas01cr@239: 
mas01cr@595:   if ((fd = open(path, O_RDWR|O_CREAT|O_EXCL, ADB_CREAT_PERMISSIONS)) < 0) {
mas01cr@498:     goto error;
mas01cr@498:   }
mas01cr@239: 
mas01cr@498:   header = (adb_header_t *) malloc(sizeof(adb_header_t));
mas01cr@498:   if(!header) {
mas01cr@498:     goto error;
mas01cr@498:   }
mas01cr@239: 
mas01cr@239:   // Initialize header
mas01cr@509:   header->magic = ADB_MAGIC;
mas01cr@509:   header->version = ADB_FORMAT_VERSION;
mas01cr@498:   header->numFiles = 0;
mas01cr@498:   header->dim = 0;
mas01cr@498:   header->flags = 0;
mas01cr@509:   header->headerSize = ADB_HEADER_SIZE;
mas01cr@498:   header->length = 0;
mas01cr@509:   header->fileTableOffset = align_page_up(ADB_HEADER_SIZE);
mas01cr@509:   header->trackTableOffset = align_page_up(header->fileTableOffset + ADB_FILETABLE_ENTRY_SIZE*ntracks); //
mas01cr@509:   header->dataOffset = align_page_up(header->trackTableOffset + ADB_TRACKTABLE_ENTRY_SIZE*ntracks);
mas01cr@256: 
mas01cr@498:   databytes = ((off_t) datasize) * 1024 * 1024;
mas01cr@498:   auxbytes = databytes / datadim;
mas01cr@498: 
mas01mc@324:   // If database will fit in a single file the vectors are copied into the AudioDB instance
mas01mc@324:   // Else all the vectors are left on the FileSystem and we use the dataOffset as storage
mas01mc@324:   // for the location of the features, powers and times files (assuming that arbitrary keys are used for the fileTable)
mas01cr@509:   if(ntracks < ADB_FIXME_LARGE_ADB_NTRACKS && datasize < ADB_FIXME_LARGE_ADB_SIZE) {
mas01cr@509:     header->timesTableOffset = align_page_up(header->dataOffset + databytes);
mas01cr@509:     header->powerTableOffset = align_page_up(header->timesTableOffset + 2*auxbytes);
mas01cr@509:     header->l2normTableOffset = align_page_up(header->powerTableOffset + auxbytes);
mas01cr@509:     header->dbSize = align_page_up(header->l2normTableOffset + auxbytes);
mas01cr@509:   } else { // Create REFERENCES ADB, features and powers kept on filesystem
mas01cr@509:     header->flags |= ADB_HEADER_FLAG_REFERENCES;
mas01cr@509:     header->timesTableOffset = align_page_up(header->dataOffset + ADB_FILETABLE_ENTRY_SIZE*ntracks);
mas01cr@509:     header->powerTableOffset = align_page_up(header->timesTableOffset + ADB_FILETABLE_ENTRY_SIZE*ntracks);
mas01cr@509:     header->l2normTableOffset = align_page_up(header->powerTableOffset + ADB_FILETABLE_ENTRY_SIZE*ntracks);
mas01cr@498:     header->dbSize = header->l2normTableOffset;
mas01mc@324:   }
mas01cr@239: 
mas01cr@509:   write_or_goto_error(fd, header, ADB_HEADER_SIZE);
mas01cr@239: 
mas01cr@596:   // go to the location corresponding to the last byte of the database
mas01cr@596:   // file, and write a byte there.
mas01cr@596:   lseek_set_or_goto_error(fd, header->dbSize - 1);
mas01cr@498:   write_or_goto_error(fd, "", 1);
mas01cr@239: 
mas01cr@498:   free(header);
mas01cr@498:   return audiodb_open(path, O_RDWR);
mas01cr@498: 
mas01cr@498:  error:
mas01cr@596:   maybe_free(header);
mas01cr@498:   return NULL;
mas01cr@239: }