Add Chromium-only Blender WebEngine parity work

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

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+/*******************************************************************************
+ * Copyright 2009-2025 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 EchoReader.h
+ * @ingroup fx
+ * The EchoReader class.
+ */
+
+#include <memory>
+
+#include "fx/EffectReader.h"
+#include "util/Buffer.h"
+
+AUD_NAMESPACE_BEGIN
+
+class AUD_API EchoReader : public EffectReader
+{
+private:
+	float m_delay;
+	float m_feedback;
+	float m_mix;
+	bool m_resetBuffer;
+
+	Buffer m_inBuffer;
+	Buffer m_delayBuffer;
+
+	int m_writePosition{0};
+	int m_samplesAvailable{0};
+
+public:
+	EchoReader(std::shared_ptr<IReader> reader, float delay, float feedback, float mix, bool resetBuffer = true);
+
+	virtual void read(int& length, bool& eos, sample_t* buffer) override;
+	virtual void seek(int position) override;
+};
+
+AUD_NAMESPACE_END