1 /*
2 * Olive. Olive is a free non-linear video editor for Windows, macOS, and Linux.
3 * Copyright (C) 2018 {{ organization }}
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 *along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18 #include "audionoiseeffect.h"
19
20 #include <QDateTime>
21 #include <QtMath>
22
AudioNoiseEffect(Clip * c,const EffectMeta * em)23 AudioNoiseEffect::AudioNoiseEffect(Clip* c, const EffectMeta *em) : Effect(c, em) {
24 EffectRow* amount_row = new EffectRow(this, tr("Amount"));
25 amount_val = new DoubleField(amount_row, "amount");
26 amount_val->SetMinimum(0);
27 amount_val->SetDefault(20);
28 amount_val->SetMaximum(100);
29
30 EffectRow* mix_row = new EffectRow(this, tr("Mix"));
31 mix_val = new BoolField(mix_row, "mix");
32 mix_val->SetValueAt(0, true);
33 }
34
process_audio(double timecode_start,double timecode_end,quint8 * samples,int nb_bytes,int)35 void AudioNoiseEffect::process_audio(double timecode_start, double timecode_end, quint8 *samples, int nb_bytes, int) {
36 double interval = (timecode_end - timecode_start)/nb_bytes;
37 for (int i=0;i<nb_bytes;i+=4) {
38 double timecode = timecode_start+(interval*i);
39
40 qint16 left_noise_sample = this->randomNumber<qint16>();
41 qint16 right_noise_sample = this->randomNumber<qint16>();
42
43 // set noise volume
44 double vol = log_volume( amount_val->GetDoubleAt(timecode)*0.01 );
45 left_noise_sample *= vol;
46 right_noise_sample *= vol;
47
48 // mix with source audio
49 if (mix_val->GetBoolAt(timecode)) {
50 qint16 left_sample = static_cast<qint16> (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
51 qint16 right_sample = static_cast<qint16> (((samples[i+3] & 0xFF) << 8) | (samples[i+2] & 0xFF));
52 left_noise_sample = mix_audio_sample(left_noise_sample, left_sample);
53 right_noise_sample = mix_audio_sample(right_noise_sample, right_sample);
54 }
55
56 samples[i+3] = static_cast<quint8> (right_noise_sample >> 8);
57 samples[i+2] = static_cast<quint8> (right_noise_sample);
58 samples[i+1] = static_cast<quint8> (left_noise_sample >> 8);
59 samples[i] = static_cast<quint8> (left_noise_sample);
60 }
61 }
62