62 lines
2.0 KiB
C++
62 lines
2.0 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 "paneffect.h"
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#include <QGridLayout>
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#include <QLabel>
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#include <QtMath>
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#include <cmath>
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#include "ui/labelslider.h"
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#include "ui/collapsiblewidget.h"
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PanEffect::PanEffect(Clip* c, const EffectMeta *em) : Effect(c, em) {
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EffectRow* pan_row = new EffectRow(this, tr("Pan"));
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pan_val = new DoubleField(pan_row, "pan");
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pan_val->SetMinimum(-100);
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pan_val->SetDefault(0);
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pan_val->SetMaximum(100);
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}
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void PanEffect::process_audio(double timecode_start, double timecode_end, quint8* samples, int nb_bytes, int) {
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double interval = (timecode_end - timecode_start)/nb_bytes;
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for (int i=0;i<nb_bytes;i+=4) {
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double pan_field_val = pan_val->GetDoubleAt(timecode_start+(interval*i));
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double pval = log_volume(qAbs(pan_field_val)*0.01);
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qint16 left_sample = qint16(((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
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qint16 right_sample = qint16(((samples[i+3] & 0xFF) << 8) | (samples[i+2] & 0xFF));
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if (pan_field_val < 0) {
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// affect right channel
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right_sample *= (1.0-pval);
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} else {
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// affect left channel
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left_sample *= (1.0-pval);
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}
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samples[i+3] = quint8(right_sample >> 8);
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samples[i+2] = quint8(right_sample);
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samples[i+1] = quint8(left_sample >> 8);
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samples[i] = quint8(left_sample);
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}
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}
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