61 lines
2.5 KiB
C++
61 lines
2.5 KiB
C++
/*
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* Olive. Olive is a free non-linear video editor for Windows, macOS, and Linux.
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* Copyright (C) 2018 {{ organization }}
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*
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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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*
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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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*
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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 "audionoiseeffect.h"
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#include <QDateTime>
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#include <QtMath>
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AudioNoiseEffect::AudioNoiseEffect(Clip* c, const EffectMeta *em) : Effect(c, em) {
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amount_val = add_row(tr("Amount"))->add_field(EFFECT_FIELD_DOUBLE, "amount");
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amount_val->set_double_minimum_value(0);
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amount_val->set_double_maximum_value(100);
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amount_val->set_double_default_value(20);
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mix_val = add_row(tr("Mix"))->add_field(EFFECT_FIELD_BOOL, "mix");
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mix_val->set_bool_value(true);
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}
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void AudioNoiseEffect::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 timecode = timecode_start+(interval*i);
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qint16 left_noise_sample = this->randomNumber<qint16>();
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qint16 right_noise_sample = this->randomNumber<qint16>();
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// set noise volume
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double vol = log_volume( amount_val->get_double_value(timecode, true)*0.01 );
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left_noise_sample *= vol;
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right_noise_sample *= vol;
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// mix with source audio
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if (mix_val->get_bool_value(timecode, true)) {
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qint16 left_sample = static_cast<qint16> (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
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qint16 right_sample = static_cast<qint16> (((samples[i+3] & 0xFF) << 8) | (samples[i+2] & 0xFF));
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left_noise_sample = mix_audio_sample(left_noise_sample, left_sample);
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right_noise_sample = mix_audio_sample(right_noise_sample, right_sample);
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}
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samples[i+3] = static_cast<quint8> (right_noise_sample >> 8);
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samples[i+2] = static_cast<quint8> (right_noise_sample);
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samples[i+1] = static_cast<quint8> (left_noise_sample >> 8);
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samples[i] = static_cast<quint8> (left_noise_sample);
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}
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}
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