ParametricEQ.h

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+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2012  Jonas Thedering
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License along
+	with this program; if not, write to the Free Software Foundation, Inc.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <string>
+
+struct BiQuad
+{
+    BiQuad() {}
+    BiQuad(float dbGain, float freq, float srate, float bandwidthOrQ, bool isQ);
+        
+    __declspec(align(16)) float a[4];
+	float a0;
+};
+
+class ParametricEQ
+{
+public:
+	ParametricEQ();
+	~ParametricEQ();
+
+	void initialize(float sampleRate, unsigned channelCount);
+	void loadConfig();
+	void process(float *output, float *input, unsigned frameCount);
+
+private:
+	void loadConfig(std::wstring path, unsigned& loadFilterCount, float& loadPreamp);
+	float getFreq(char* freqString);
+	static unsigned long __stdcall notificationThread(void* parameter);
+
+	std::wstring configPath;
+	float sampleRate;
+	unsigned channelCount;
+	float preamp;
+    BiQuad filters[100];
+    unsigned filterCount;
+    float sampleData[2000];
+	bool lastInputWasSilent;
+	void* threadHandle;
+	void* shutdownEvent;
+};