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#include "audionoiseeffect.h"
#include <QDateTime>
#include <QtMath>
AudioNoiseEffect::AudioNoiseEffect(Clip* c, const EffectMeta *em) : Effect(c, em) {
amount_val = add_row("Amount:")->add_field(EFFECT_FIELD_DOUBLE, "amount");
amount_val->set_double_minimum_value(0);
amount_val->set_double_maximum_value(100);
amount_val->set_double_default_value(20);
mix_val = add_row("Mix:")->add_field(EFFECT_FIELD_BOOL, "mix");
mix_val->set_bool_value(true);
srand(QDateTime::currentMSecsSinceEpoch());
}
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 = rand();
qint16 right_noise_sample = rand();
// set noise volume
double vol = log_volume( amount_val->get_double_value(timecode, true)*0.01 );
left_noise_sample *= vol;
right_noise_sample *= vol;
// mix with source audio
if (mix_val->get_bool_value(timecode, true)) {
qint16 left_sample = (qint16) (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
qint16 right_sample = (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] = (quint8) (right_noise_sample >> 8);
samples[i+2] = (quint8) right_noise_sample;
samples[i+1] = (quint8) (left_noise_sample >> 8);
samples[i] = (quint8) left_noise_sample;
}
}
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