add Noise effect

I came up with an interesting formula having no idea what it would sound like. It turned out to make some gnarly noise. :)
Be-ing · May 3, 2020 · 02cb69b · 02cb69b
1 parent 63e5db9
commit 02cb69b
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Showing 4 changed files with 113 additions and 8 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -263,6 +263,7 @@ add_library(mixxx-lib STATIC EXCLUDE_FROM_ALL
   src/effects/backends/builtin/loudnesscontoureffect.cpp
   src/effects/backends/builtin/metronomeeffect.cpp
   src/effects/backends/builtin/moogladder4filtereffect.cpp
+  src/effects/backends/builtin/noiseeffect.cpp
   src/effects/backends/builtin/parametriceqeffect.cpp
   src/effects/backends/builtin/phasereffect.cpp
   src/effects/backends/builtin/reverbeffect.cpp

diff --git a/src/effects/backends/builtin/builtinbackend.cpp b/src/effects/backends/builtin/builtinbackend.cpp
@@ -1,19 +1,21 @@
 
+#include "effects/backends/builtin/builtinbackend.h"
+
 #include <QtDebug>
 
-#include "effects/backends/builtin/builtinbackend.h"
-#include "effects/backends/builtin/flangereffect.h"
-#include "effects/backends/builtin/bitcrushereffect.h"
 #include "effects/backends/builtin/balanceeffect.h"
-#include "effects/backends/builtin/linkwitzriley8eqeffect.h"
-#include "effects/backends/builtin/bessel8lvmixeqeffect.h"
 #include "effects/backends/builtin/bessel4lvmixeqeffect.h"
-#include "effects/backends/builtin/threebandbiquadeqeffect.h"
+#include "effects/backends/builtin/bessel8lvmixeqeffect.h"
 #include "effects/backends/builtin/biquadfullkilleqeffect.h"
-#include "effects/backends/builtin/graphiceqeffect.h"
-#include "effects/backends/builtin/parametriceqeffect.h"
+#include "effects/backends/builtin/bitcrushereffect.h"
 #include "effects/backends/builtin/filtereffect.h"
+#include "effects/backends/builtin/flangereffect.h"
+#include "effects/backends/builtin/graphiceqeffect.h"
+#include "effects/backends/builtin/linkwitzriley8eqeffect.h"
 #include "effects/backends/builtin/moogladder4filtereffect.h"
+#include "effects/backends/builtin/noiseeffect.h"
+#include "effects/backends/builtin/parametriceqeffect.h"
+#include "effects/backends/builtin/threebandbiquadeqeffect.h"
 #ifndef __MACAPPSTORE__
 #include "effects/backends/builtin/reverbeffect.h"
 #endif
@@ -40,6 +42,7 @@ BuiltInBackend::BuiltInBackend() {
     registerEffect<FilterEffect>();
     registerEffect<MoogLadder4FilterEffect>();
     registerEffect<BitCrusherEffect>();
+    registerEffect<NoiseEffect>();
     registerEffect<BalanceEffect>();
     // Fancy effects
     registerEffect<FlangerEffect>();

diff --git a/src/effects/backends/builtin/noiseeffect.cpp b/src/effects/backends/builtin/noiseeffect.cpp
@@ -0,0 +1,60 @@
+#include "effects/backends/builtin/noiseeffect.h"
+
+#include "effects/backends/effectmanifest.h"
+
+// static
+QString NoiseEffect::getId() {
+    return "org.mixxx.effects.noise";
+}
+
+// static
+EffectManifestPointer NoiseEffect::getManifest() {
+    EffectManifestPointer pManifest(new EffectManifest());
+    pManifest->setId(getId());
+    pManifest->setName(QObject::tr("Noise"));
+    pManifest->setShortName(QObject::tr("Noise"));
+    pManifest->setAuthor("The Mixxx Team");
+    pManifest->setVersion("1.0");
+    pManifest->setDescription(QObject::tr(
+            "Adds noise"));
+    pManifest->setEffectRampsFromDry(true);
+    pManifest->setMetaknobDefault(0.0);
+
+    EffectManifestParameterPointer depth = pManifest->addParameter();
+    depth->setId("depth");
+    depth->setName(QObject::tr("Depth"));
+    depth->setShortName(QObject::tr("Depth"));
+    depth->setDescription(QObject::tr(
+            "Depth"));
+    depth->setValueScaler(EffectManifestParameter::ValueScaler::LOGARITHMIC);
+    depth->setSemanticHint(EffectManifestParameter::SemanticHint::UNKNOWN);
+    depth->setUnitsHint(EffectManifestParameter::UnitsHint::UNKNOWN);
+    depth->setDefaultLinkType(EffectManifestParameter::LinkType::LINKED);
+    depth->setRange(0, 0, 1);
+
+    return pManifest;
+}
+
+void NoiseEffect::loadEngineEffectParameters(
+        const QMap<QString, EngineEffectParameterPointer>& parameters) {
+    m_pDepthParameter = parameters.value("depth");
+}
+
+void NoiseEffect::processChannel(
+        NoiseGroupState* pState,
+        const CSAMPLE* pInput,
+        CSAMPLE* pOutput,
+        const mixxx::EngineParameters& bufferParameters,
+        const EffectEnableState enableState,
+        const GroupFeatureState& groupFeatures) {
+    Q_UNUSED(pState);
+    Q_UNUSED(groupFeatures);
+    Q_UNUSED(enableState);
+
+    const CSAMPLE depth = m_pDepthParameter->value();
+
+    for (unsigned int i = 0; i < bufferParameters.samplesPerBuffer(); i++) {
+        int sign = (pInput[i] >= 0) ? 1 : -1;
+        pOutput[i] = sign * depth - pInput[i];
+    }
+}
diff --git a/src/effects/backends/builtin/noiseeffect.h b/src/effects/backends/builtin/noiseeffect.h
@@ -0,0 +1,41 @@
+#pragma once
+
+#include "effects/backends/effectprocessor.h"
+#include "engine/effects/engineeffectparameter.h"
+#include "util/types.h"
+
+// This effect requires no state.
+struct NoiseGroupState : public EffectState {
+    NoiseGroupState(const mixxx::EngineParameters& bufferParameters)
+            : EffectState(bufferParameters) {
+    }
+};
+
+class NoiseEffect : public EffectProcessorImpl<NoiseGroupState> {
+  public:
+    NoiseEffect(){};
+    ~NoiseEffect(){};
+
+    static QString getId();
+    static EffectManifestPointer getManifest();
+
+    void loadEngineEffectParameters(
+            const QMap<QString, EngineEffectParameterPointer>& parameters) override;
+
+    void processChannel(
+            NoiseGroupState* pState,
+            const CSAMPLE* pInput,
+            CSAMPLE* pOutput,
+            const mixxx::EngineParameters& bufferParameters,
+            const EffectEnableState enableState,
+            const GroupFeatureState& groupFeatureState) override;
+
+  private:
+    QString debugString() const {
+        return getId();
+    }
+
+    EngineEffectParameterPointer m_pDepthParameter;
+
+    DISALLOW_COPY_AND_ASSIGN(NoiseEffect);
+};