diff audioDB.cpp @ 140:ddd83d773d6c

Smaller databases

Adjust the sizes of the various tables (file, track, times, l2norm)
linearly with the overall size of the database.

Now it makes sense to allow 50Mb databases, as the various fixed-size
tables shrink, rather than being fixed to somewhere over that size...

--- a/audioDB.cpp	Mon Oct 29 11:45:50 2007 +0000
+++ b/audioDB.cpp	Mon Oct 29 11:47:42 2007 +0000
@@ -153,7 +153,7 @@
   }
 
   if(args_info.size_given) {
-    if (args_info.size_arg < 250 || args_info.size_arg > 4000) {
+    if (args_info.size_arg < 50 || args_info.size_arg > 4000) {
       error("Size out of range", "");
     }
     size = args_info.size_arg * 1000000;
@@ -398,6 +398,8 @@
   dbH = new dbTableHeaderT();
   assert(dbH);
 
+  unsigned int maxfiles = (unsigned int) rint((double) O2_MAXFILES * (double) size / (double) O2_DEFAULTDBSIZE);
+
   // Initialize header
   dbH->magic = O2_MAGIC;
   dbH->version = O2_FORMAT_VERSION;
@@ -406,10 +408,10 @@
   dbH->flags = 0;
   dbH->length = 0;
   dbH->fileTableOffset = ALIGN_UP(O2_HEADERSIZE, 8);
-  dbH->trackTableOffset = ALIGN_UP(dbH->fileTableOffset + O2_FILETABLESIZE*O2_MAXFILES, 8);
-  dbH->dataOffset = ALIGN_UP(dbH->trackTableOffset + O2_TRACKTABLESIZE*O2_MAXFILES, 8);
-  dbH->l2normTableOffset = ALIGN_DOWN(size - O2_MAXFILES*O2_MEANNUMVECTORS*sizeof(double), 8);
-  dbH->timesTableOffset = ALIGN_DOWN(dbH->l2normTableOffset - O2_MAXFILES*O2_MEANNUMVECTORS*sizeof(double), 8);
+  dbH->trackTableOffset = ALIGN_UP(dbH->fileTableOffset + O2_FILETABLESIZE*maxfiles, 8);
+  dbH->dataOffset = ALIGN_UP(dbH->trackTableOffset + O2_TRACKTABLESIZE*maxfiles, 8);
+  dbH->l2normTableOffset = ALIGN_DOWN(size - maxfiles*O2_MEANNUMVECTORS*sizeof(double), 8);
+  dbH->timesTableOffset = ALIGN_DOWN(dbH->l2normTableOffset - maxfiles*O2_MEANNUMVECTORS*sizeof(double), 8);
   dbH->dbSize = size;
 
   memcpy (db, dbH, O2_HEADERSIZE);