56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "exponentialfadetransition.h"
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#include <QtMath>
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ExponentialFadeTransition::ExponentialFadeTransition(ClipPtr c, ClipPtr s, const EffectMeta* em) : Transition(c, s, em) {}
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void ExponentialFadeTransition::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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switch (type) {
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case kTransitionOpening:
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samp *= qPow(timecode_start + (interval * i), 2);
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break;
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case kTransitionClosing:
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samp *= qPow(1 - (timecode_start + (interval * i)), 2);
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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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