84 lines
2.3 KiB
C++
84 lines
2.3 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 "logarithmicfadetransition.h"
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#include <QtMath>
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LogarithmicFadeTransition::LogarithmicFadeTransition(Clip* c) :
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Transition(c)
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{
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}
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QString LogarithmicFadeTransition::name()
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{
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return tr("Logarithmic Fade");
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}
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QString LogarithmicFadeTransition::id()
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{
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return "org.olivevideoeditor.Olive.logarithmicfade";
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}
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QString LogarithmicFadeTransition::description()
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{
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return tr("An logarithmic audio fade that starts fast and ends slow.");
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}
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EffectType LogarithmicFadeTransition::type()
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{
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return EFFECT_TYPE_TRANSITION;
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}
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olive::TrackType LogarithmicFadeTransition::subtype()
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{
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return olive::kTypeAudio;
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}
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NodePtr LogarithmicFadeTransition::Create(Clip *c)
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{
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return std::make_shared<LogarithmicFadeTransition>(c);
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}
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void LogarithmicFadeTransition::process_audio(double timecode_start,
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double timecode_end,
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float **samples,
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int nb_samples,
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int channel_count,
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int type) {
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double interval = (timecode_end-timecode_start)/nb_samples;
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for (int i=0;i<nb_samples;i++) {
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float multi = timecode_start + (interval * i);
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for (int j=0;j<channel_count;j++) {
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switch (type) {
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case kTransitionOpening:
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samples[j][i] *= qSqrt(multi);
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break;
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case kTransitionClosing:
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samples[j][i] *= qSqrt(1.0f - multi);
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break;
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}
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}
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}
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}
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