Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/include/fx/Threshold.h

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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+/**
+ * @file Threshold.h
+ * @ingroup fx
+ * The Threshold class.
+ */
+
+#include "fx/Effect.h"
+
+AUD_NAMESPACE_BEGIN
+
+class CallbackIIRFilterReader;
+
+/**
+ * This sound Transforms any signal to a square signal by thresholding.
+ */
+class AUD_API Threshold : public Effect
+{
+private:
+	/**
+	 * The threshold.
+	 */
+	const float m_threshold;
+
+	// delete copy constructor and operator=
+	Threshold(const Threshold&) = delete;
+	Threshold& operator=(const Threshold&) = delete;
+
+public:
+	/**
+	 * Creates a new threshold sound.
+	 * \param sound The input sound.
+	 * \param threshold The threshold.
+	 */
+	Threshold(std::shared_ptr<ISound> sound, float threshold = 0.0f);
+
+	/**
+	 * Returns the threshold.
+	 */
+	float getThreshold() const;
+
+	virtual std::shared_ptr<IReader> createReader();
+
+	/**
+	 * The thresholdFilter function implements the doFilterIIR callback
+	 * for the callback IIR filter.
+	 * @param reader The CallbackIIRFilterReader that executes the callback.
+	 * @param threshold The threshold value.
+	 * @return The filtered sample.
+	 */
+	static sample_t AUD_LOCAL thresholdFilter(CallbackIIRFilterReader* reader, float* threshold);
+
+	/**
+	 * The endThresholdFilter function implements the endFilterIIR callback
+	 * for the callback IIR filter.
+	 * @param threshold The threshold value.
+	 */
+	static void AUD_LOCAL endThresholdFilter(float* threshold);
+};
+
+AUD_NAMESPACE_END