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