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GUI: sample resampling

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tildearrow 2022-03-20 03:14:00 -05:00
parent 90a18611cd
commit 03cb910e93
6 changed files with 517 additions and 4 deletions
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1
CMakeLists.txt
View file

@ -282,6 +282,7 @@ src/engine/config.cpp
src/engine/dispatchContainer.cpp
src/engine/engine.cpp
src/engine/fileOps.cpp
src/engine/filter.cpp
src/engine/instrument.cpp
src/engine/macroInt.cpp
src/engine/pattern.cpp

88
src/engine/filter.cpp Normal file
View file

@ -0,0 +1,88 @@
/**
* Furnace Tracker - multi-system chiptune tracker
* Copyright (C) 2021-2022 tildearrow and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stddef.h>
#define _USE_MATH_DEFINES
#include <math.h>
#include "filter.h"
#include "../ta-log.h"
float* DivFilterTables::cubicTable=NULL;
float* DivFilterTables::sincTable=NULL;
float* DivFilterTables::sincIntegralTable=NULL;
// portions from Schism Tracker (scripts/lutgen.c)
// licensed under same license as this program.
float* DivFilterTables::getCubicTable() {
if (cubicTable==NULL) {
logD("initializing cubic spline table.\n");
cubicTable=new float[4096];
for (int i=0; i<1024; i++) {
float x=(float)i/1024.0;
cubicTable[(i<<2)]=-0.5*pow(x,3)+1.0*pow(x,2)-0.5*x;
cubicTable[1+(i<<2)]=1.5*pow(x,3)-2.5*pow(x,2)+1.0;
cubicTable[2+(i<<2)]=-1.5*pow(x,3)+2.0*pow(x,2)+0.5*x;
cubicTable[3+(i<<2)]=0.5*pow(x,3)-0.5*pow(x,2);
}
}
return cubicTable;
}
float* DivFilterTables:: getSincTable() {
if (sincTable==NULL) {
logD("initializing sinc table.\n");
sincTable=new float[65536];
sincTable[0]=1.0f;
for (int i=1; i<65536; i++) {
int mapped=((i&8191)<<3)|(i>>13);
double x=(double)i*M_PI/8192.0;
sincTable[mapped]=sin(x)/x;
}
for (int i=0; i<65536; i++) {
int mapped=((i&8191)<<3)|(i>>13);
sincTable[mapped]*=pow(cos(M_PI*(double)i/131072.0),2.0);
}
}
return sincTable;
}
float* DivFilterTables::getSincIntegralTable() {
if (sincIntegralTable==NULL) {
logD("initializing sinc integral table.\n");
sincIntegralTable=new float[65536];
sincIntegralTable[0]=-0.5f;
for (int i=1; i<65536; i++) {
int mapped=((i&8191)<<3)|(i>>13);
int mappedPrev=(((i-1)&8191)<<3)|((i-1)>>13);
double x=(double)i*M_PI/8192.0;
double sinc=sin(x)/x;
sincIntegralTable[mapped]=sincIntegralTable[mappedPrev]+(sinc/8192.0);
}
for (int i=0; i<65536; i++) {
int mapped=((i&8191)<<3)|(i>>13);
sincIntegralTable[mapped]*=pow(cos(M_PI*(double)i/131072.0),2.0);
}
}
return sincIntegralTable;
}

43
src/engine/filter.h Normal file
View file

@ -0,0 +1,43 @@
/**
* Furnace Tracker - multi-system chiptune tracker
* Copyright (C) 2021-2022 tildearrow and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
class DivFilterTables {
public:
static float* cubicTable;
static float* sincTable;
static float* sincIntegralTable;
/**
* get a 1024x4 cubic spline table.
* @return the table.
*/
static float* getCubicTable();
/**
* get a 8192x8 one-side sine-windowed sinc table.
* @return the table.
*/
static float* getSincTable();
/**
* get a 8192x8 one-side sine-windowed sinc integral table.
* @return the table.
*/
static float* getSincIntegralTable();
};

345
src/engine/sample.cpp
View file

@ -19,9 +19,10 @@
#include "sample.h"
#include "../ta-log.h"
#include <math.h>
#include <string.h>
#include <sndfile.h>
#include <math.h>
#include "filter.h"
extern "C" {
#include "../../extern/adpcm/bs_codec.h"
@ -178,6 +179,348 @@ bool DivSample::resize(unsigned int count) {
return false;
}
#define RESAMPLE_BEGIN \
if (samples<1) return true; \
int finalCount=(double)samples*(r/(double)rate); \
signed char* oldData8=data8; \
short* oldData16=data16; \
if (depth==16) { \
if (data16!=NULL) { \
data16=NULL; \
initInternal(16,finalCount); \
} \
} else if (depth==8) { \
if (data8!=NULL) { \
data8=NULL; \
initInternal(8,finalCount); \
} \
} else { \
return false; \
}
#define RESAMPLE_END \
samples=finalCount; \
if (depth==16) { \
delete[] oldData16; \
} else if (depth==8) { \
delete[] oldData8; \
}
bool DivSample::resampleNone(double r) {
RESAMPLE_BEGIN;
if (depth==16) {
for (int i=0; i<finalCount; i++) {
unsigned int pos=(unsigned int)((double)i*((double)rate/r));
if (pos>=samples) {
data16[i]=0;
} else {
data16[i]=oldData16[pos];
}
}
} else if (depth==8) {
for (int i=0; i<finalCount; i++) {
unsigned int pos=(unsigned int)((double)i*((double)rate/r));
if (pos>=samples) {
data8[i]=0;
} else {
data8[i]=oldData8[pos];
}
}
}
rate=r;
RESAMPLE_END;
return true;
}
bool DivSample::resampleLinear(double r) {
RESAMPLE_BEGIN;
double posFrac=0;
unsigned int posInt=0;
double factor=(double)rate/r;
if (depth==16) {
for (int i=0; i<finalCount; i++) {
short s1=(posInt>=samples)?0:oldData16[posInt];
short s2=(posInt+1>=samples)?((loopStart>=0 && loopStart<(int)samples)?oldData16[loopStart]:0):oldData16[posInt+1];
data16[i]=s1+(float)(s2-s1)*posFrac;
posFrac+=factor;
while (posFrac>=1.0) {
posFrac-=1.0;
posInt++;
}
}
} else if (depth==8) {
for (int i=0; i<finalCount; i++) {
short s1=(posInt>=samples)?0:oldData8[posInt];
short s2=(posInt+1>=samples)?((loopStart>=0 && loopStart<(int)samples)?oldData8[loopStart]:0):oldData8[posInt+1];
data8[i]=s1+(float)(s2-s1)*posFrac;
posFrac+=factor;
while (posFrac>=1.0) {
posFrac-=1.0;
posInt++;
}
}
}
rate=r;
RESAMPLE_END;
return true;
}
bool DivSample::resampleCubic(double r) {
RESAMPLE_BEGIN;
double posFrac=0;
unsigned int posInt=0;
double factor=(double)rate/r;
float* cubicTable=DivFilterTables::getCubicTable();
if (depth==16) {
for (int i=0; i<finalCount; i++) {
unsigned int n=((unsigned int)(posFrac*1024.0))&1023;
float* t=&cubicTable[n<<2];
float s0=(posInt<1)?0:oldData16[posInt-1];
float s1=(posInt>=samples)?0:oldData16[posInt];
float s2=(posInt+1>=samples)?((loopStart>=0 && loopStart<(int)samples)?oldData16[loopStart]:0):oldData16[posInt+1];
float s3=(posInt+2>=samples)?((loopStart>=0 && loopStart<(int)samples)?oldData16[loopStart]:0):oldData16[posInt+2];
float result=s0*t[0]+s1*t[1]+s2*t[2]+s3*t[3];
if (result<-32768) result=-32768;
if (result>32767) result=32767;
data16[i]=result;
posFrac+=factor;
while (posFrac>=1.0) {
posFrac-=1.0;
posInt++;
}
}
} else if (depth==8) {
for (int i=0; i<finalCount; i++) {
unsigned int n=((unsigned int)(posFrac*1024.0))&1023;
float* t=&cubicTable[n<<2];
float s0=(posInt<1)?0:oldData8[posInt-1];
float s1=(posInt>=samples)?0:oldData8[posInt];
float s2=(posInt+1>=samples)?((loopStart>=0 && loopStart<(int)samples)?oldData8[loopStart]:0):oldData8[posInt+1];
float s3=(posInt+2>=samples)?((loopStart>=0 && loopStart<(int)samples)?oldData8[loopStart]:0):oldData8[posInt+2];
float result=s0*t[0]+s1*t[1]+s2*t[2]+s3*t[3];
if (result<-128) result=-128;
if (result>127) result=127;
data8[i]=result;
posFrac+=factor;
while (posFrac>=1.0) {
posFrac-=1.0;
posInt++;
}
}
}
rate=r;
RESAMPLE_END;
return true;
}
bool DivSample::resampleBlep(double r) {
RESAMPLE_BEGIN;
double posFrac=0;
unsigned int posInt=0;
double factor=r/(double)rate;
float* sincITable=DivFilterTables::getSincIntegralTable();
float s[16];
memset(s,0,16*sizeof(float));
if (depth==16) {
memset(data16,0,finalCount*sizeof(short));
for (int i=0; i<finalCount; i++) {
if (posInt<samples) {
int result=data16[i]+oldData16[posInt];
if (result<-32768) result=-32768;
if (result>32767) result=32767;
data16[i]=result;
}
posFrac+=1.0;
while (posFrac>=1.0) {
unsigned int n=((unsigned int)(posFrac*8192.0))&8191;
posFrac-=factor;
posInt++;
float* t1=&sincITable[(8191-n)<<3];
float* t2=&sincITable[n<<3];
float delta=oldData16[posInt]-oldData16[posInt-1];
for (int j=0; j<8; j++) {
if (i-j>0) {
float result=data16[i-j]+t1[j]*-delta;
if (result<-32768) result=-32768;
if (result>32767) result=32767;
data16[i-j]=result;
}
if (i+j+1<finalCount) {
float result=data16[i+j+1]+t2[j]*delta;
if (result<-32768) result=-32768;
if (result>32767) result=32767;
data16[i+j+1]=result;
}
}
}
}
} else if (depth==8) {
memset(data8,0,finalCount*sizeof(short));
for (int i=0; i<finalCount; i++) {
if (posInt<samples) {
int result=data8[i]+oldData8[posInt];
if (result<-128) result=-128;
if (result>127) result=127;
data8[i]=result;
}
posFrac+=1.0;
while (posFrac>=1.0) {
unsigned int n=((unsigned int)(posFrac*8192.0))&8191;
posFrac-=factor;
posInt++;
float* t1=&sincITable[(8191-n)<<3];
float* t2=&sincITable[n<<3];
float delta=oldData8[posInt]-oldData8[posInt-1];
for (int j=0; j<8; j++) {
if (i-j>0) {
float result=data8[i-j]+t1[j]*-delta;
if (result<-128) result=-128;
if (result>127) result=127;
data8[i-j]=result;
}
if (i+j+1<finalCount) {
float result=data8[i+j+1]+t2[j]*delta;
if (result<-128) result=-128;
if (result>127) result=127;
data8[i+j+1]=result;
}
}
}
}
}
rate=r;
RESAMPLE_END;
return true;
}
bool DivSample::resampleSinc(double r) {
RESAMPLE_BEGIN;
double posFrac=0;
unsigned int posInt=0;
double factor=(double)rate/r;
float* sincTable=DivFilterTables::getSincTable();
float s[16];
memset(s,0,16*sizeof(float));
if (depth==16) {
for (int i=0; i<finalCount+8; i++) {
unsigned int n=((unsigned int)(posFrac*8192.0))&8191;
float result=0;
float* t1=&sincTable[(8191-n)<<3];
float* t2=&sincTable[n<<3];
for (int j=0; j<8; j++) {
result+=s[j]*t2[7-j];
result+=s[8+j]*t1[j];
}
if (result<-32768) result=-32768;
if (result>32767) result=32767;
if (i>=8) {
data16[i-8]=result;
}
posFrac+=factor;
while (posFrac>=1.0) {
posFrac-=1.0;
posInt++;
for (int j=0; j<15; j++) s[j]=s[j+1];
s[15]=(posInt>=samples)?0:oldData16[posInt];
}
}
} else if (depth==8) {
for (int i=0; i<finalCount+8; i++) {
unsigned int n=((unsigned int)(posFrac*8192.0))&8191;
float result=0;
float* t1=&sincTable[(8191-n)<<3];
float* t2=&sincTable[n<<3];
for (int j=0; j<8; j++) {
result+=s[j]*t2[7-j];
result+=s[8+j]*t1[j];
}
if (result<-32768) result=-32768;
if (result>32767) result=32767;
if (i>=8) {
data8[i-8]=result;
}
posFrac+=factor;
while (posFrac>=1.0) {
posFrac-=1.0;
posInt++;
for (int j=0; j<15; j++) s[j]=s[j+1];
s[15]=(posInt>=samples)?0:oldData8[posInt];
}
}
}
rate=r;
RESAMPLE_END;
return true;
}
bool DivSample::resample(double r, int filter) {
if (depth!=8 && depth!=16) return false;
switch (filter) {
case DIV_RESAMPLE_NONE:
return resampleNone(r);
break;
case DIV_RESAMPLE_LINEAR:
return resampleLinear(r);
break;
case DIV_RESAMPLE_CUBIC:
return resampleCubic(r);
break;
case DIV_RESAMPLE_BLEP:
return resampleBlep(r);
break;
case DIV_RESAMPLE_SINC:
return resampleSinc(r);
break;
case DIV_RESAMPLE_BEST:
if (r>rate) {
return resampleSinc(r);
} else {
return resampleBlep(r);
}
break;
}
return false;
}
void DivSample::render() {
// step 1: convert to 16-bit if needed
if (depth!=16) {

27
src/engine/sample.h
View file

@ -19,6 +19,15 @@
#include "../ta-utils.h"
enum DivResampleFilters {
DIV_RESAMPLE_NONE=0,
DIV_RESAMPLE_LINEAR,
DIV_RESAMPLE_CUBIC,
DIV_RESAMPLE_BLEP,
DIV_RESAMPLE_SINC,
DIV_RESAMPLE_BEST
};
struct DivSample {
String name;
int rate, centerRate, loopStart, loopOffP;
@ -53,6 +62,15 @@ struct DivSample {
unsigned int samples;
/**
* @warning DO NOT USE - internal functions
*/
bool resampleNone(double rate);
bool resampleLinear(double rate);
bool resampleCubic(double rate);
bool resampleBlep(double rate);
bool resampleSinc(double rate);
/**
* save this sample to a file.
* @param path a path.
@ -84,6 +102,15 @@ struct DivSample {
*/
bool resize(unsigned int count);
/**
* change the sample rate.
* @warning do not attempt to resample outside of a synchronized block!
* @param rate number of samples.
* @param filter the interpolation filter.
* @return whether it was successful.
*/
bool resample(double rate, int filter);
/**
* initialize the rest of sample formats for this sample.
*/

17
src/gui/sampleEdit.cpp
View file

@ -159,7 +159,9 @@ void FurnaceGUI::drawSampleEdit() {
}
if (ImGui::Button("Resize")) {
e->synchronized([this,sample]() {
sample->resize(resizeSize);
if (!sample->resize(resizeSize)) {
showError("couldn't resize! make sure your sample is 8 or 16-bit.");
}
e->renderSamples();
});
updateSampleTex=true;
@ -202,7 +204,16 @@ void FurnaceGUI::drawSampleEdit() {
if (resampleTarget>96000) resampleTarget=96000;
}
ImGui::Combo("Filter",&resampleStrat,resampleStrats,6);
ImGui::Button("Resample");
if (ImGui::Button("Resample")) {
e->synchronized([this,sample]() {
if (!sample->resample(resampleTarget,resampleStrat)) {
showError("couldn't resample! make sure your sample is 8 or 16-bit.");
}
e->renderSamples();
});
updateSampleTex=true;
ImGui::CloseCurrentPopup();
}
ImGui::EndPopup();
} else {
resampleTarget=sample->rate;
@ -332,7 +343,7 @@ void FurnaceGUI::drawSampleEdit() {
ImGui::ImageButton(sampleTex,avail,ImVec2(0,0),ImVec2(1,1),0);
if (ImGui::IsItemClicked()) {
printf("drawing\n");
logD("drawing\n");
}
ImGui::Text("A workaround! Pretty cool huh?");