engines/common/SineLFO.h

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2005 Christian Schoenebeck                              *
 *   Copyright (C) 2011 Christian Schoenebeck and Grigor Iliev             *
 *                                                                         *
 *   This library 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 library 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 library; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_SINELFO_H__
#define __LS_SINELFO_H__

#include "LFOBase.h"

namespace LinuxSampler {

    /** @brief sine LFO
     */
    template<range_type_t RANGE>
    class SineLFO : public LFOBase<RANGE> {
        public:

            /**
             * Constructor
             *
             * @param Max - maximum value of the output levels
             */
            SineLFO(float Max) : LFOBase<RANGE>::LFOBase(Max) {
            }

            /**
             * Calculates exactly one sample point of the LFO wave.
             *
             * @returns next LFO level
             */
            inline float render() {
                uiLevel += c;
                if (RANGE == range_unsigned)
                    return normalizer * (sin(c2 * (float)uiLevel) + 1.0f);
                else /* signed range */
                    return normalizer * sin(c2 * (float)uiLevel);
            }

            /**
             * Update LFO depth with a new external controller value.
             *
             * @param ExtControlValue - new external controller value
             */
            inline void updateByMIDICtrlValue(const uint16_t& ExtControlValue) {
                this->ExtControlValue = ExtControlValue;

                //const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
                const float max = (this->InternalDepth + ExtControlValue * this->ExtControlDepthCoeff) * this->ScriptDepthFactor;
                if (RANGE == range_unsigned) {
                    normalizer = max / 2.0f;
                } else { // signed range
                    normalizer = max;
                }
            }
            
            /**
             * Will be called by the voice when the key / voice was triggered.
             *
             * @param Frequency       - frequency of the oscillator in Hz
             * @param StartLevel      - not implemented
             * @param InternalDepth   - firm, internal oscillator amplitude
             * @param ExtControlDepth - defines how strong the external MIDI
             *                          controller has influence on the
             *                          oscillator amplitude
             * @param FlipPhase       - not implemented
             * @param SampleRate      - current sample rate of the engines
             *                          audio output signal
             */
            virtual void trigger(float Frequency, start_level_t StartLevel, uint16_t InternalDepth, uint16_t ExtControlDepth, bool FlipPhase, unsigned int SampleRate) {
                this->Frequency            = Frequency;
                this->InternalDepth        = (InternalDepth / 1200.0f) * this->Max;
                this->ExtControlDepthCoeff = (((float) ExtControlDepth / 1200.0f) / 127.0f) * this->Max;
                this->ScriptFrequencyFactor = this->ScriptDepthFactor = 1.f; // reset for new voice

                const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
                const float freq = Frequency * this->ScriptFrequencyFactor;
                const float r = freq / (float) SampleRate; // frequency alteration quotient
                c = (int) (intLimit * r);
                c2 = (2.0f * M_PI) / (float) intLimit;

                uiLevel = 0;
            }
            
            /**
             * @param phase 0 to 360 degrees
             */
            void setPhase(float phase) {
                if (phase < 0) phase = 0;
                if (phase > 360) phase = 360;
                phase /= 360.0f;
                const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
                uiLevel = intLimit * phase;
            }
            
            void setFrequency(float Frequency, unsigned int SampleRate) {
                this->Frequency = Frequency;
                const float freq = Frequency * this->ScriptFrequencyFactor;
                const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
                float r = freq / (float) SampleRate; // frequency alteration quotient
                c = (int) (intLimit * r);
            }

            void setScriptDepthFactor(float factor) {
                this->ScriptDepthFactor = factor;
                updateByMIDICtrlValue(this->ExtControlValue);
            }

            void setScriptFrequencyFactor(float factor, unsigned int SampleRate) {
                this->ScriptFrequencyFactor = factor;
                setFrequency(this->Frequency, SampleRate);
            }

        protected:
            unsigned int uiLevel;
            int   c;
            float c2;
            float normalizer;
    };

} // namespace LinuxSampler

#endif // __LS_SINELFO_H__
1	iliev	2223	/***************************************************************************
2			* *
3			* Copyright (C) 2005 Christian Schoenebeck *
4			* Copyright (C) 2011 Christian Schoenebeck and Grigor Iliev *
5			* *
6			* This library is free software; you can redistribute it and/or modify *
7			* it under the terms of the GNU General Public License as published by *
8			* the Free Software Foundation; either version 2 of the License, or *
9			* (at your option) any later version. *
10			* *
11			* This library is distributed in the hope that it will be useful, *
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
14			* GNU General Public License for more details. *
15			* *
16			* You should have received a copy of the GNU General Public License *
17			* along with this library; if not, write to the Free Software *
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
19			* MA 02111-1307 USA *
20			***************************************************************************/
21
22			#ifndef __LS_SINELFO_H__
23			#define __LS_SINELFO_H__
24
25			#include "LFOBase.h"
26
27			namespace LinuxSampler {
28
29			/** @brief sine LFO
30			*/
31			template<range_type_t RANGE>
32			class SineLFO : public LFOBase<RANGE> {
33			public:
34
35			/**
36			* Constructor
37			*
38			* @param Max - maximum value of the output levels
39			*/
40			SineLFO(float Max) : LFOBase<RANGE>::LFOBase(Max) {
41			}
42
43			/**
44			* Calculates exactly one sample point of the LFO wave.
45			*
46			* @returns next LFO level
47			*/
48			inline float render() {
49			uiLevel += c;
50			if (RANGE == range_unsigned)
51			return normalizer * (sin(c2 * (float)uiLevel) + 1.0f);
52			else /* signed range */
53			return normalizer * sin(c2 * (float)uiLevel);
54			}
55
56			/**
57			* Update LFO depth with a new external controller value.
58			*
59			* @param ExtControlValue - new external controller value
60			*/
61	schoenebeck	3118	inline void updateByMIDICtrlValue(const uint16_t& ExtControlValue) {
62			this->ExtControlValue = ExtControlValue;
63
64	schoenebeck	3034	//const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
65	schoenebeck	3118	const float max = (this->InternalDepth + ExtControlValue * this->ExtControlDepthCoeff) * this->ScriptDepthFactor;
66	iliev	2223	if (RANGE == range_unsigned) {
67			normalizer = max / 2.0f;
68			} else { // signed range
69			normalizer = max;
70			}
71			}
72
73			/**
74			* Will be called by the voice when the key / voice was triggered.
75			*
76			* @param Frequency - frequency of the oscillator in Hz
77			* @param StartLevel - not implemented
78			* @param InternalDepth - firm, internal oscillator amplitude
79			* @param ExtControlDepth - defines how strong the external MIDI
80			* controller has influence on the
81			* oscillator amplitude
82			* @param FlipPhase - not implemented
83			* @param SampleRate - current sample rate of the engines
84			* audio output signal
85			*/
86			virtual void trigger(float Frequency, start_level_t StartLevel, uint16_t InternalDepth, uint16_t ExtControlDepth, bool FlipPhase, unsigned int SampleRate) {
87	schoenebeck	3118	this->Frequency = Frequency;
88	iliev	2223	this->InternalDepth = (InternalDepth / 1200.0f) * this->Max;
89			this->ExtControlDepthCoeff = (((float) ExtControlDepth / 1200.0f) / 127.0f) * this->Max;
90	schoenebeck	3118	this->ScriptFrequencyFactor = this->ScriptDepthFactor = 1.f; // reset for new voice
91	iliev	2223
92			const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
93	schoenebeck	3118	const float freq = Frequency * this->ScriptFrequencyFactor;
94			const float r = freq / (float) SampleRate; // frequency alteration quotient
95	iliev	2223	c = (int) (intLimit * r);
96			c2 = (2.0f * M_PI) / (float) intLimit;
97
98			uiLevel = 0;
99			}
100	iliev	2225
101			/**
102			* @param phase 0 to 360 degrees
103			*/
104			void setPhase(float phase) {
105			if (phase < 0) phase = 0;
106			if (phase > 360) phase = 360;
107			phase /= 360.0f;
108			const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
109			uiLevel = intLimit * phase;
110			}
111	iliev	2227
112			void setFrequency(float Frequency, unsigned int SampleRate) {
113	schoenebeck	3118	this->Frequency = Frequency;
114			const float freq = Frequency * this->ScriptFrequencyFactor;
115	iliev	2227	const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
116	schoenebeck	3118	float r = freq / (float) SampleRate; // frequency alteration quotient
117	iliev	2227	c = (int) (intLimit * r);
118			}
119	iliev	2223
120	schoenebeck	3118	void setScriptDepthFactor(float factor) {
121			this->ScriptDepthFactor = factor;
122			updateByMIDICtrlValue(this->ExtControlValue);
123			}
124
125			void setScriptFrequencyFactor(float factor, unsigned int SampleRate) {
126			this->ScriptFrequencyFactor = factor;
127			setFrequency(this->Frequency, SampleRate);
128			}
129
130	iliev	2223	protected:
131			unsigned int uiLevel;
132			int c;
133			float c2;
134			float normalizer;
135			};
136
137			} // namespace LinuxSampler
138
139			#endif // __LS_SINELFO_H__