Added: VST Plugin support. Add and configure plugins via Configuration Editor. The plugin's architecture has to match the OS architecture, so most people will need 64-bit plugins. The subdirectory plugins is offered to put plugins into, but they can be opened from any directory with sufficient permissions.

Fixed: When trying to add a high-pass filter in the Configuration Editor, it was instead configured to be a low-pass filter.

filters/VSTPluginFilter.h

@@ -0,0 +1,59 @@
+/*
+    This file is part of Equalizer APO, a system-wide equalizer.
+    Copyright (C) 2017  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 "IFilter.h"
+#include "helpers/VSTPluginLibrary.h"
+
+#pragma AVRT_VTABLES_BEGIN
+class VSTPluginFilter : public IFilter
+{
+public:
+	VSTPluginFilter(std::shared_ptr<VSTPluginLibrary> library, std::wstring chunkData, std::unordered_map<std::wstring, float> paramMap);
+	~VSTPluginFilter();
+
+	bool getInPlace() override {return false;}
+	std::vector<std::wstring> initialize(float sampleRate, unsigned maxFrameCount, std::vector<std::wstring> channelNames) override;
+	void prepareForProcessing(float sampleRate, unsigned maxFrameCount);
+	void process(float** output, float** input, unsigned frameCount) override;
+
+	std::shared_ptr<VSTPluginLibrary> getLibrary() const;
+	std::wstring getChunkData() const;
+	std::unordered_map<std::wstring, float> getParamMap() const;
+
+private:
+	void cleanup();
+
+	std::shared_ptr<VSTPluginLibrary> library;
+	std::wstring libPath;
+	std::wstring chunkData;
+	std::unordered_map<std::wstring, float> paramMap;
+	size_t channelCount;
+	unsigned effectChannelCount;
+	size_t effectCount = 0;
+	VSTPluginInstance** effects = NULL;
+	size_t emptyChannelCount = 0;
+	float** emptyChannels = NULL;
+	float** inputArray = NULL;
+	float** outputArray = NULL;
+	bool skipProcessing = false;
+	bool reportCrash = true;
+};
+#pragma AVRT_VTABLES_END