added noise effect and drawing nested sequences to texture

effects/audio/audionoiseeffect.cpp

@@ -0,0 +1,42 @@
+#include "audionoiseeffect.h"
+
+#include <QDateTime>
+
+AudioNoiseEffect::AudioNoiseEffect(Clip* c) : Effect(c, EFFECT_TYPE_AUDIO, AUDIO_NOISE_EFFECT) {
+	amount_val = add_row("Amount:")->add_field(EFFECT_FIELD_DOUBLE);
+	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_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
+		left_noise_sample *= amount_val->get_double_value(timecode)*0.01;
+		right_noise_sample *= amount_val->get_double_value(timecode)*0.01;
+
+		// mix with source audio
+		if (mix_val->get_bool_value(timecode)) {
+			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 += left_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;
+	}
+}

effects/audio/audionoiseeffect.h

@@ -0,0 +1,15 @@
+#ifndef AUDIONOISEEFFECT_H
+#define AUDIONOISEEFFECT_H
+
+#include "../effect.h"
+
+class AudioNoiseEffect : public Effect {
+public:
+	AudioNoiseEffect(Clip* c);
+	void process_audio(double timecode_start, double timecode_end, quint8* samples, int nb_bytes, int channel_count);
+
+	EffectField* amount_val;
+	EffectField* mix_val;
+};
+
+#endif // AUDIONOISEEFFECT_H

effects/effect.cpp

@@ -29,6 +29,7 @@
 
 #include "effects/audio/paneffect.h"
 #include "effects/audio/volumeeffect.h"
+#include "effects/audio/audionoiseeffect.h"
 
 #include <QCheckBox>
 #include <QGridLayout>
@@ -55,6 +56,7 @@ void init_effects() {
 
 	audio_effect_names[AUDIO_VOLUME_EFFECT] = "Volume";
 	audio_effect_names[AUDIO_PAN_EFFECT] = "Pan";
+	audio_effect_names[AUDIO_NOISE_EFFECT] = "Noise";
 }
 
 Effect* create_effect(int effect_id, Clip* c) {
@@ -74,6 +76,7 @@ Effect* create_effect(int effect_id, Clip* c) {
 		switch (effect_id) {
 		case AUDIO_VOLUME_EFFECT: return new VolumeEffect(c); break;
 		case AUDIO_PAN_EFFECT: return new PanEffect(c); break;
+		case AUDIO_NOISE_EFFECT: return new AudioNoiseEffect(c); break;
 		}
 	}
 	qDebug() << "[ERROR] Invalid effect ID";

effects/effect.h

@@ -35,6 +35,7 @@ enum VideoEffects {
 enum AudioEffects {
 	AUDIO_VOLUME_EFFECT,
 	AUDIO_PAN_EFFECT,
+	AUDIO_NOISE_EFFECT,
 	AUDIO_EFFECT_COUNT
 };