50 lines
1.8 KiB
C++
50 lines
1.8 KiB
C++
#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("Amount:")->add_field(EFFECT_FIELD_DOUBLE);
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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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amount_val->id = "amount";
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mix_val = add_row("Mix:")->add_field(EFFECT_FIELD_BOOL);
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mix_val->id = "mix";
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mix_val->set_bool_value(true);
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srand(QDateTime::currentMSecsSinceEpoch());
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connect(amount_val, SIGNAL(changed()), this, SLOT(field_changed()));
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connect(mix_val, SIGNAL(changed()), this, SLOT(field_changed()));
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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 = rand();
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qint16 right_noise_sample = rand();
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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 = (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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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] = (quint8) (right_noise_sample >> 8);
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samples[i+2] = (quint8) right_noise_sample;
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samples[i+1] = (quint8) (left_noise_sample >> 8);
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samples[i] = (quint8) left_noise_sample;
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}
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}
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