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heuristic for song length determination

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song length calculation of lorge.fur now takes 18ms (from ~1 hour)
This commit is contained in:
tildearrow 2025-11-09 20:42:38 -05:00
parent 61ac87d505
commit 9e8c97cc6f
6 changed files with 53 additions and 14 deletions
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37
src/engine/song.cpp
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@ -19,6 +19,7 @@
#include "song.h"
#include "../ta-log.h"
#include <inttypes.h>
#include <chrono>
TimeMicros DivSongTimestamps::getTimes(int order, int row) {
@ -347,22 +348,40 @@ void DivSubSong::calcTimestamps(int chans, std::vector<DivGroovePattern>& groove
// MAKE IT WORK
while (!endOfSong) {
// heuristic
int advance=(curVirtualTempoD*ticks)/curVirtualTempoN;
for (int i=0; i<chans; i++) {
if (rowDelay[i]>0) {
if (rowDelay[i]<advance) advance=rowDelay[i];
}
}
if (advance<1) advance=1;
//logV("tick %" PRIu64 " advance: %d",ts.totalTicks,advance);
// cycle channels to find a tick rate/tempo change effect after delay
// (unfortunately Cxxx and F0xx are not pre-effects and obey EDxx)
for (int i=0; i<chans; i++) {
if (rowDelay[i]>0) {
if (--rowDelay[i]==0) {
rowDelay[i]-=advance;
if (rowDelay[i]==0) {
tinyProcessRow(i,true);
}
}
}
// run virtual tempo
tempoAccum+=curVirtualTempoN;
tempoAccum+=curVirtualTempoN*advance;
while (tempoAccum>=curVirtualTempoD) {
tempoAccum-=curVirtualTempoD;
int ticksToRun=tempoAccum/curVirtualTempoD;
tempoAccum%=curVirtualTempoD;
// tick counter
if (--ticks<=0) {
ticks-=ticksToRun;
if (ticks<0) {
// if ticks is negative, we must call ticks back
tempoAccum+=-ticks*curVirtualTempoD;
}
if (ticks<=0) {
if (shallStopSched) {
shallStop=true;
break;
@ -400,8 +419,8 @@ void DivSubSong::calcTimestamps(int chans, std::vector<DivGroovePattern>& groove
if (!endOfSong) {
// update playback time
double dt=divider;//*((double)virtualTempoN/(double)MAX(1,virtualTempoD));
ts.totalTicks++;
double dt=divider/(double)advance;//*((double)virtualTempoN/(double)MAX(1,virtualTempoD));
ts.totalTicks+=advance;
ts.totalTime.micros+=1000000/dt;
totalMicrosOff+=fmod(1000000.0,dt);
@ -410,9 +429,10 @@ void DivSubSong::calcTimestamps(int chans, std::vector<DivGroovePattern>& groove
ts.totalTime.micros++;
}
if (ts.totalTime.micros>=1000000) {
ts.totalTime.micros-=1000000;
// who's gonna play a song for 68 years?
if (ts.totalTime.seconds<0x7fffffff) ts.totalTime.seconds++;
ts.totalTime.seconds+=ts.totalTime.micros/1000000;
if (ts.totalTime.seconds<0) ts.totalTime.seconds=INT_MAX;
ts.totalTime.micros%=1000000;
}
}
if (ts.maxRow[curOrder]<curRow) ts.maxRow[curOrder]=curRow;
@ -425,6 +445,7 @@ void DivSubSong::calcTimestamps(int chans, std::vector<DivGroovePattern>& groove
std::chrono::high_resolution_clock::time_point timeEnd=std::chrono::high_resolution_clock::now();
logV("calcTimestamps() took %dµs",std::chrono::duration_cast<std::chrono::microseconds>(timeEnd-timeStart).count());
logV("song length: %s; %" PRIu64 " ticks",ts.totalTime.toString(6,TA_TIME_FORMAT_AUTO),ts.totalTicks);
}
void DivSubSong::clearData() {