Initial community commit

Src/external_dependencies/openmpt-trunk/sounddsp/EQ.h

@@ -0,0 +1,66 @@
+/*
+ * EQ.h
+ * ----
+ * Purpose: Mixing code for equalizer.
+ * Notes  : Ugh... This should really be removed at some point.
+ * Authors: Olivier Lapicque
+ *          OpenMPT Devs
+ * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
+ */
+
+
+#pragma once
+
+#include "openmpt/all/BuildSettings.hpp"
+
+#include "openmpt/base/Types.hpp"
+#include "openmpt/soundbase/MixSample.hpp"
+
+#include <array>
+
+#include <cstddef>
+
+OPENMPT_NAMESPACE_BEGIN
+
+#ifndef NO_EQ
+
+inline constexpr std::size_t MAX_EQ_CHANNELS = 4;
+inline constexpr std::size_t MAX_EQ_BANDS = 6;
+
+struct EQBANDSTATE
+{
+	float x1 = 0.0f;
+	float x2 = 0.0f;
+	float y1 = 0.0f;
+	float y2 = 0.0f;
+};
+
+struct EQBANDSETTINGS
+{
+	float a0;
+	float a1;
+	float a2;
+	float b1;
+	float b2;
+	float Gain;
+	float CenterFrequency;
+};
+
+class CEQ
+{
+private:
+	std::array<std::array<EQBANDSTATE, MAX_EQ_BANDS>, MAX_EQ_CHANNELS> m_ChannelState;
+	std::array<EQBANDSETTINGS, MAX_EQ_BANDS> m_Bands;
+	template <typename TMixSample>
+	void ProcessTemplate(TMixSample *frontBuffer, TMixSample *rearBuffer, std::size_t countFrames, std::size_t numChannels);
+public:
+	CEQ();
+	void Initialize(bool bReset, uint32 MixingFreq);
+	void Process(MixSampleInt *frontBuffer, MixSampleInt *rearBuffer, std::size_t countFrames, std::size_t numChannels);
+	void Process(MixSampleFloat *frontBuffer, MixSampleFloat *rearBuffer, std::size_t countFrames, std::size_t numChannels);
+	void SetEQGains(const uint32 *pGains, const uint32 *pFreqs, bool bReset, uint32 MixingFreq);
+};
+
+#endif // !NO_EQ
+
+OPENMPT_NAMESPACE_END