public KMIF_LOGTABLE LogTableAddRef()
{
lock (log_tables_mutex)
{
//while (log_tables_mutex != 1)
//{
// XSLEEP(0);
//}
if (log_tables_refcount == 0)
{
//log_tables = XMALLOC(sizeof(KMIF_LOGTABLE));
log_tables = new KMIF_LOGTABLE();
if (log_tables != null)
{
//XMEMSET(log_tables, 0, sizeof(KMIF_LOGTABLE));
log_tables.ctx = log_tables;
log_tables.release = LogTableRelease;
LogTableCalc(log_tables);
}
}
if (log_tables != null)
{
log_tables_refcount++;
}
}
return(log_tables);
}
public Int32 LogToLin(KMIF_LOGTABLE kmif_lt, Int32 l, UInt32 sft)
{
Int32 ret;
UInt32 ofs;
ofs = (UInt32)(l + (sft << (LOG_BITS + 1)));
sft = ofs >> (LOG_BITS + 1);
if (sft >= LOG_LIN_BITS)
{
return(0);
}
ofs = (ofs >> 1) & ((1 << LOG_BITS) - 1);
ret = (Int32)(kmif_lt.logtbl[ofs] >> (Int32)sft);
return((l & 1) != 0 ? -ret : ret);
}
public void LogTableRelease(object ctx)
{
lock (log_tables_mutex)
{
//while (log_tables_mutex != 1)
//{
//XSLEEP(0);
//}
log_tables_refcount--;
if (log_tables_refcount == 0)
{
//XFREE(ctx);
log_tables = null;
}
}
}
private void LogTableCalc(KMIF_LOGTABLE kmif_lt)
{
UInt32 i;
double a;
for (i = 0; i < (1 << LOG_BITS); i++)
{
a = (1 << LOG_LIN_BITS) / Math.Pow(2, i / (double)(1 << LOG_BITS));
kmif_lt.logtbl[i] = (UInt32)a;
}
kmif_lt.lineartbl[0] = LOG_LIN_BITS << LOG_BITS;
for (i = 1; i < (1 << LIN_BITS) + 1; i++)
{
UInt32 ua;
a = i << (LOG_LIN_BITS - LIN_BITS);
ua = (UInt32)((LOG_LIN_BITS - (Math.Log(a) / Math.Log(2))) * (1 << LOG_BITS));
kmif_lt.lineartbl[i] = ua << 1;
}
}
