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#include "exponentialfadetransition.h"
#include <QtMath>
ExponentialFadeTransition::ExponentialFadeTransition(Clip* c, Clip* s, const EffectMeta* em) : Transition(c, s, em) {}
void ExponentialFadeTransition::process_audio(double timecode_start, double timecode_end, quint8* samples, int nb_bytes, int type) {
double interval = (timecode_end-timecode_start)/nb_bytes;
for (int i=0;i<nb_bytes;i+=2) {
qint16 samp = (qint16) (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
/*switch (type) {
case TRAN_TYPE_OPEN:
case TRAN_TYPE_OPENWLINK:
samp *= qSqrt(timecode_start + (interval * i));
break;
case TRAN_TYPE_CLOSE:
case TRAN_TYPE_CLOSEWLINK:
samp *= qSqrt(1 - (timecode_start + (interval * i)));
break;
}*/
switch (type) {
case TA_OPENING_TRANSITION:
samp *= qPow(timecode_start + (interval * i), 2);
break;
case TA_CLOSING_TRANSITION:
samp *= qPow(1 - (timecode_start + (interval * i)), 2);
break;
}
samples[i+1] = (quint8) (samp >> 8);
samples[i] = (quint8) samp;
}
}
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