/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2019  Olive Team

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#include "audionoiseeffect.h"

#include <QDateTime>
#include <QtMath>

AudioNoiseEffect::AudioNoiseEffect(Clip* c, const EffectMeta *em) : Effect(c, em) {
  EffectRow* amount_row = new EffectRow(this, tr("Amount"));
  amount_val = new DoubleField(amount_row, "amount");
  amount_val->SetMinimum(0);
  amount_val->SetDefault(20);
  amount_val->SetMaximum(100);

  EffectRow* mix_row = new EffectRow(this, tr("Mix"));
  mix_val = new BoolField(mix_row, "mix");
  mix_val->SetValueAt(0, true);
}

void AudioNoiseEffect::process_audio(double timecode_start, double timecode_end, quint8 *samples, int nb_bytes, int) {
  double interval = (timecode_end - timecode_start)/nb_bytes;
  for (int i=0;i<nb_bytes;i+=4) {
    double timecode = timecode_start+(interval*i);

    qint16 left_noise_sample = this->randomNumber<qint16>();
    qint16 right_noise_sample = this->randomNumber<qint16>();

    // set noise volume
    double vol = log_volume( amount_val->GetDoubleAt(timecode)*0.01 );
    left_noise_sample *= vol;
    right_noise_sample *= vol;

    // mix with source audio
    if (mix_val->GetBoolAt(timecode)) {
      qint16 left_sample = static_cast<qint16> (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
      qint16 right_sample = static_cast<qint16> (((samples[i+3] & 0xFF) << 8) | (samples[i+2] & 0xFF));
      left_noise_sample = mix_audio_sample(left_noise_sample, left_sample);
      right_noise_sample = mix_audio_sample(right_noise_sample, right_sample);
    }

    samples[i+3] = static_cast<quint8> (right_noise_sample >> 8);
    samples[i+2] = static_cast<quint8> (right_noise_sample);
    samples[i+1] = static_cast<quint8> (left_noise_sample >> 8);
    samples[i] = static_cast<quint8> (left_noise_sample);
  }
}