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DAC: add interpolation settings

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This commit is contained in:
tildearrow 2022-12-18 03:54:30 -05:00
parent 51ea3cec2a
commit e0723c7485
5 changed files with 101 additions and 2 deletions
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23
src/engine/filter.cpp
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@ -24,6 +24,7 @@
float* DivFilterTables::cubicTable=NULL;
float* DivFilterTables::sincTable=NULL;
float* DivFilterTables::sincTable8=NULL;
float* DivFilterTables::sincIntegralTable=NULL;
// portions from Schism Tracker (scripts/lutgen.c)
@ -44,7 +45,7 @@ float* DivFilterTables::getCubicTable() {
return cubicTable;
}
float* DivFilterTables:: getSincTable() {
float* DivFilterTables::getSincTable() {
if (sincTable==NULL) {
logD("initializing sinc table.");
sincTable=new float[65536];
@ -64,6 +65,26 @@ float* DivFilterTables:: getSincTable() {
return sincTable;
}
float* DivFilterTables::getSincTable8() {
if (sincTable8==NULL) {
logD("initializing sinc table (8).");
sincTable8=new float[32768];
sincTable8[0]=1.0f;
for (int i=1; i<32768; i++) {
int mapped=((i&8191)<<2)|(i>>13);
double x=(double)i*M_PI/8192.0;
sincTable8[mapped]=sin(x)/x;
}
for (int i=0; i<32768; i++) {
int mapped=((i&8191)<<2)|(i>>13);
sincTable8[mapped]*=pow(cos(M_PI*(double)i/65536.0),2.0);
}
}
return sincTable8;
}
float* DivFilterTables::getSincIntegralTable() {
if (sincIntegralTable==NULL) {
logD("initializing sinc integral table.");