added bassbooster-effect and effect-lib

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@439 0778d3d1-df1d-0410-868b-ea421aaaa00d
2006-12-18 00:29:17 +00:00
parent c6aa917e9c
commit 64aa78c4f6
13 changed files with 644 additions and 10 deletions
--- a/include/effect_lib.h
+++ b/include/effect_lib.h
@@ -0,0 +1,165 @@
+/*
+ * effect_lib.h - library with simple inline-effects
+ *
+ * Copyright (c) 2006 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ * 
+ * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
+ *
+ * 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 (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+
+#ifndef _EFFECT_LIB_H
+#define _EFFECT_LIB_H
+
+#include "templates.h"
+#include "types.h"
+
+namespace effectLib
+{
+	template<typename SAMPLE = sample_t>
+	class base
+	{
+	public:
+		typedef SAMPLE sampleType;
+		virtual ~base()
+		{
+		}
+		virtual SAMPLE nextSample( const SAMPLE _in ) const = 0;
+	} ;
+
+	template<typename SAMPLE = sample_t>
+	class stereoBase
+	{
+	public:
+		virtual ~stereoBase()
+		{
+		}
+		typedef SAMPLE sampleType;
+		virtual void nextSample( SAMPLE & _in_left,
+						SAMPLE & _in_right ) const = 0;
+	} ;
+
+	template<class FX>
+	class monoToStereoAdaptor : public stereoBase<typename FX::sampleType>
+	{
+	public:
+		typedef typename FX::sampleType sampleType;
+
+		monoToStereoAdaptor( const FX & _mono_fx ) :
+			m_leftFX( _mono_fx ),
+			m_rightFX( _mono_fx )
+		{
+		}
+
+		virtual void nextSample( sampleType & _in_left,
+						sampleType & _in_right ) const
+		{
+			_in_left = m_leftFX.nextSample( _in_left );
+			_in_right = m_rightFX.nextSample( _in_right );
+		}
+
+	private:
+		FX m_leftFX;
+		FX m_rightFX;
+	} ;
+
+
+	template<typename SAMPLE>
+	inline SAMPLE saturate( const SAMPLE _x )
+	{
+		return( tMin<SAMPLE>( tMax<SAMPLE>( -1.0f, _x ), 1.0f ) );
+	}
+
+
+	template<typename SAMPLE = sample_t>
+	class bassBoost : public base<SAMPLE>
+	{
+	public:
+		bassBoost( const float _selectivity,
+				const float _gain,
+				const float _ratio ) :
+			m_selectivity( _selectivity ),
+			m_gain1( 1.0f / ( m_selectivity + 1.0f ) ),
+			m_gain2( _gain ),
+			m_ratio( _ratio ),
+			m_cap( 0.0f )
+		{
+		}
+
+		virtual ~bassBoost()
+		{
+		}
+
+		virtual SAMPLE nextSample( const SAMPLE _in ) const
+		{
+			m_cap = ( _in + m_cap*m_selectivity ) * m_gain1;
+			return( /*saturate<SAMPLE>(*/ ( _in + m_cap*m_ratio ) *
+								m_gain2/* )*/ );
+		}
+
+/*		void setSelectivity( const float _selectivity )
+		{
+			m_selectivity = _selectivity;
+			m_gain1 = 1.0f / ( m_selectivity + 1.0f );
+		}
+
+		void setGain( const float _gain )
+		{
+			m_gain2 = _gain;
+		}
+
+		void setRatio( const float _ratio )
+		{
+			m_ratio = _ratio;
+		}*/
+
+	private:
+		float m_selectivity;
+		float m_gain1;
+		float m_gain2;
+		float m_ratio;
+		mutable float m_cap;
+	} ;
+
+
+	template<typename SAMPLE = sample_t>
+	class stereoEnhancer : public stereoBase<SAMPLE>
+	{
+	public:
+		stereoEnhancer( const float _wide_coeff ) :
+			m_wideCoeff( _wide_coeff )
+		{
+		}
+
+		virtual void nextSample( SAMPLE & _in_left,
+						SAMPLE & _in_right ) const
+		{
+			const float delta = ( _in_left -
+				( _in_left+_in_right ) / 2.0f ) * m_wideCoeff;
+			_in_left += delta;
+			_in_right -= delta;
+		}
+
+	private:
+		const float m_wideCoeff;
+	} ;
+
+} ;
+
+
+#endif