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Prepare for backward and bi-directional loop

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This commit is contained in:
cam900 2022-08-11 22:21:54 +09:00
parent da8f7dabd5
commit d44f5f0b2b
27 changed files with 418 additions and 123 deletions
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108
src/engine/playback.cpp
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@ -760,6 +760,7 @@ void DivEngine::processRow(int i, bool afterDelay) {
sPreview.sample=-1;
sPreview.wave=-1;
sPreview.pos=0;
sPreview.dir=false;
break;
}
}
@ -1268,26 +1269,109 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
DivSample* s=song.sample[sPreview.sample];
for (size_t i=0; i<prevtotal; i++) {
if (sPreview.pos>=s->samples || (sPreview.pEnd>=0 && (int)sPreview.pos>=sPreview.pEnd)) {
if (sPreview.pos>=(int)s->samples || (sPreview.pEnd>=0 && sPreview.pos>=sPreview.pEnd)) {
samp_temp=0;
} else {
samp_temp=s->data16[sPreview.pos++];
samp_temp=s->data16[sPreview.pos];
if (sPreview.dir) {
sPreview.pos--;
}
else {
sPreview.pos++;
}
}
blip_add_delta(samp_bb,i,samp_temp-samp_prevSample);
samp_prevSample=samp_temp;
if (sPreview.pos>=s->getEndPosition() || (sPreview.pEnd>=0 && (int)sPreview.pos>=sPreview.pEnd)) {
if (s->isLoopable() && (int)sPreview.pos>=s->loopStart) {
sPreview.pos=s->loopStart;
if (sPreview.dir) { // backward
if (sPreview.pos<s->getLoopStartPosition() || (sPreview.pBegin>=0 && sPreview.pos<sPreview.pBegin)) {
if (s->isLoopable() && sPreview.pos<s->getLoopEndPosition()) {
switch (s->loopMode) {
case DivSampleLoopMode::DIV_SAMPLE_LOOP_FORWARD:
sPreview.pos=s->getLoopStartPosition();
sPreview.dir=false;
break;
case DivSampleLoopMode::DIV_SAMPLE_LOOP_BACKWARD:
sPreview.pos=s->getLoopEndPosition()-1;
sPreview.dir=true;
break;
case DivSampleLoopMode::DIV_SAMPLE_LOOP_PINGPONG:
sPreview.pos=s->getLoopStartPosition();
sPreview.dir=false;
break;
default:
break;
}
}
}
} else { // forward
if (sPreview.pos>=s->getLoopEndPosition() || (sPreview.pEnd>=0 && sPreview.pos>=sPreview.pEnd)) {
if (s->isLoopable() && sPreview.pos>=s->getLoopStartPosition()) {
switch (s->loopMode) {
case DivSampleLoopMode::DIV_SAMPLE_LOOP_FORWARD:
sPreview.pos=s->getLoopStartPosition();
sPreview.dir=false;
break;
case DivSampleLoopMode::DIV_SAMPLE_LOOP_BACKWARD:
sPreview.pos=s->getLoopEndPosition()-1;
sPreview.dir=true;
break;
case DivSampleLoopMode::DIV_SAMPLE_LOOP_PINGPONG:
sPreview.pos=s->getLoopEndPosition()-1;
sPreview.dir=true;
break;
default:
break;
}
}
}
}
}
if (sPreview.pos>=s->getEndPosition() || (sPreview.pEnd>=0 && (int)sPreview.pos>=sPreview.pEnd)) {
if (s->isLoopable() && (int)sPreview.pos>=s->loopStart) {
sPreview.pos=s->loopStart;
} else if (sPreview.pos>=s->samples) {
sPreview.sample=-1;
if (sPreview.dir) { // backward
if (sPreview.pos<=s->getLoopStartPosition() || (sPreview.pBegin>=0 && sPreview.pos<=sPreview.pBegin)) {
if (s->isLoopable() && sPreview.pos>=s->getLoopStartPosition()) {
switch (s->loopMode) {
case DivSampleLoopMode::DIV_SAMPLE_LOOP_FORWARD:
sPreview.pos=s->getLoopStartPosition();
sPreview.dir=false;
break;
case DivSampleLoopMode::DIV_SAMPLE_LOOP_BACKWARD:
sPreview.pos=s->getLoopEndPosition()-1;
sPreview.dir=true;
break;
case DivSampleLoopMode::DIV_SAMPLE_LOOP_PINGPONG:
sPreview.pos=s->getLoopStartPosition();
sPreview.dir=false;
break;
default:
break;
}
} else if (sPreview.pos<0) {
sPreview.sample=-1;
}
}
} else { // forward
if (sPreview.pos>=s->getLoopEndPosition() || (sPreview.pEnd>=0 && sPreview.pos>=sPreview.pEnd)) {
if (s->isLoopable() && sPreview.pos>=s->getLoopStartPosition()) {
switch (s->loopMode) {
case DivSampleLoopMode::DIV_SAMPLE_LOOP_FORWARD:
sPreview.pos=s->getLoopStartPosition();
sPreview.dir=false;
break;
case DivSampleLoopMode::DIV_SAMPLE_LOOP_BACKWARD:
sPreview.pos=s->getLoopEndPosition()-1;
sPreview.dir=true;
break;
case DivSampleLoopMode::DIV_SAMPLE_LOOP_PINGPONG:
sPreview.pos=s->getLoopEndPosition()-1;
sPreview.dir=true;
break;
default:
break;
}
} else if (sPreview.pos>=s->getEndPosition()) {
sPreview.sample=-1;
}
}
}
} else if (sPreview.wave>=0 && sPreview.wave<(int)song.wave.size()) {
@ -1298,7 +1382,7 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
} else {
samp_temp=((MIN(wave->data[sPreview.pos],wave->max)<<14)/wave->max)-8192;
}
if (++sPreview.pos>=(unsigned int)wave->len) {
if (++sPreview.pos>=wave->len) {
sPreview.pos=0;
}
blip_add_delta(samp_bb,i,samp_temp-samp_prevSample);