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prevent clock drift when previewing samples

This commit is contained in:
tildearrow 2022-01-19 23:23:47 -05:00
parent e394b5ca5a
commit 85bb081f3b
1 changed files with 11 additions and 2 deletions
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13
src/engine/playback.cpp
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@ -1,3 +1,4 @@
#include "blip_buf.h"
#define _USE_MATH_DEFINES
#include "dispatch.h"
#include "engine.h"
@ -938,8 +939,16 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
isBusy.lock();
if (out!=NULL && sPreview.sample>=0 && sPreview.sample<(int)song.sample.size()) {
unsigned int samp_bbOff=0;
unsigned int prevAvail=blip_samples_avail(samp_bb);
if (prevAvail>size) prevAvail=size;
if (prevAvail>0) {
blip_read_samples(samp_bb,samp_bbOut,prevAvail,0);
samp_bbOff=prevAvail;
}
DivSample* s=song.sample[sPreview.sample];
size_t prevtotal=blip_clocks_needed(samp_bb,size);
size_t prevtotal=blip_clocks_needed(samp_bb,size-prevAvail);
for (size_t i=0; i<prevtotal; i++) {
if (sPreview.pos>=s->rendLength) {
@ -955,7 +964,7 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
if (sPreview.pos>=s->rendLength) sPreview.sample=-1;
blip_end_frame(samp_bb,prevtotal);
blip_read_samples(samp_bb,samp_bbOut,size,0);
blip_read_samples(samp_bb,samp_bbOut+samp_bbOff,size-samp_bbOff,0);
for (size_t i=0; i<size; i++) {
out[0][i]+=(float)samp_bbOut[i]/32768.0;
out[1][i]+=(float)samp_bbOut[i]/32768.0;