engines/gig/Voice.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005, 2006 Christian Schoenebeck                        *
 *                                                                         *
 *   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., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_GIG_VOICE_H__
#define __LS_GIG_VOICE_H__

#include "../../common/global.h"

#include <gig.h>

#include "../../common/RTMath.h"
#include "../../common/RingBuffer.h"
#include "../../common/Pool.h"
#include "../../drivers/audio/AudioOutputDevice.h"
#include "../common/BiquadFilter.h"
#include "Engine.h"
#include "EngineChannel.h"
#include "Stream.h"
#include "DiskThread.h"
#include "EGADSR.h"
#include "EGDecay.h"
#include "Filter.h"
#include "../common/LFOBase.h"
#include "SynthesisParam.h"
#include "SmoothVolume.h"

// include the appropriate (unsigned) triangle LFO implementation
#if CONFIG_UNSIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
# include "../common/LFOTriangleIntMath.h"
#elif CONFIG_UNSIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
# include "../common/LFOTriangleIntAbsMath.h"
#elif CONFIG_UNSIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
# include "../common/LFOTriangleDiHarmonic.h"
#else
# error "Unknown or no (unsigned) triangle LFO implementation selected!"
#endif

// include the appropriate (signed) triangle LFO implementation
#if CONFIG_SIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
# include "../common/LFOTriangleIntMath.h"
#elif CONFIG_SIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
# include "../common/LFOTriangleIntAbsMath.h"
#elif CONFIG_SIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
# include "../common/LFOTriangleDiHarmonic.h"
#else
# error "Unknown or no (signed) triangle LFO implementation selected!"
#endif

namespace LinuxSampler { namespace gig {

    class Engine;

    /// Reflects a MIDI controller
    struct midi_ctrl {
        uint8_t controller; ///< MIDI control change controller number
        uint8_t value;      ///< Current MIDI controller value
        float   fvalue;     ///< Transformed / effective value (e.g. volume level or filter cutoff frequency)
    };

    #if CONFIG_UNSIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
    typedef LFOTriangleIntMath<range_unsigned> LFOUnsigned;
    #elif CONFIG_UNSIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
    typedef LFOTriangleIntAbsMath<range_unsigned> LFOUnsigned;
    #elif CONFIG_UNSIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
    typedef LFOTriangleDiHarmonic<range_unsigned> LFOUnsigned;
    #endif

    #if CONFIG_SIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
    typedef LFOTriangleIntMath<range_signed> LFOSigned;
    #elif CONFIG_SIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
    typedef LFOTriangleIntAbsMath<range_signed> LFOSigned;
    #elif CONFIG_SIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
    typedef LFOTriangleDiHarmonic<range_signed> LFOSigned;
    #endif

    /** Gig Voice
     *
     * Renders a voice for the Gigasampler format.
     */
    class Voice {
        public:
            // Types
            enum type_t {
                type_normal,
                type_release_trigger_required,  ///< If the key of this voice will be released, it causes a release triggered voice to be spawned
                type_release_trigger            ///< Release triggered voice which cannot be killed by releasing its key
            };

            // Attributes
            type_t       Type;         ///< Voice Type
            int          MIDIKey;      ///< MIDI key number of the key that triggered the voice
            uint         KeyGroup;
            DiskThread*  pDiskThread;  ///< Pointer to the disk thread, to be able to order a disk stream and later to delete the stream again

            // Methods
            Voice();
            virtual ~Voice();
            void Kill(Pool<Event>::Iterator& itKillEvent);
            void Render(uint Samples);
            void Reset();
            void SetOutput(AudioOutputDevice* pAudioOutputDevice);
            void SetEngine(Engine* pEngine);
            int  Trigger(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent, int PitchBend, ::gig::DimensionRegion* pDimRgn, type_t VoiceType, int iKeyGroup);
            inline bool IsActive() { return PlaybackState; }
            inline bool IsStealable() { return !itKillEvent && PlaybackState >= playback_state_ram; }
            void UpdatePortamentoPos(Pool<Event>::Iterator& itNoteOffEvent);

        //private:
            // Types
            enum playback_state_t {
                playback_state_end  = 0,
                playback_state_init = 1,
                playback_state_ram  = 2,
                playback_state_disk = 3
            };

            // Attributes
            EngineChannel*              pEngineChannel;
            Engine*                     pEngine;            ///< Pointer to the sampler engine, to be able to access the event lists.
            float                       VolumeLeft;         ///< Left channel volume. This factor is calculated when the voice is triggered and doesn't change after that.
            float                       VolumeRight;        ///< Right channel volume. This factor is calculated when the voice is triggered and doesn't change after that.
            SmoothVolume                CrossfadeSmoother;  ///< Crossfade volume, updated by crossfade CC events
            SmoothVolume                VolumeSmoother;     ///< Volume, updated by CC 7 (volume) events
            SmoothVolume                PanLeftSmoother;    ///< Left channel volume, updated by CC 10 (pan) events
            SmoothVolume                PanRightSmoother;   ///< Right channel volume, updated by CC 10 (pan) events
            double                      Pos;                ///< Current playback position in sample
            float                       PitchBase;          ///< Basic pitch depth, stays the same for the whole life time of the voice
            float                       PitchBend;          ///< Current pitch value of the pitchbend wheel
            float                       CutoffBase;         ///< Cutoff frequency before control change, EG and LFO are applied
            ::gig::Sample*              pSample;            ///< Pointer to the sample to be played back
            ::gig::DimensionRegion*     pDimRgn;            ///< Pointer to the articulation information of current dimension region of this voice
            playback_state_t            PlaybackState;      ///< When a sample will be triggered, it will be first played from RAM cache and after a couple of sample points it will switch to disk streaming and at the end of a disk stream we have to add null samples, so the interpolator can do it's work correctly
            bool                        DiskVoice;          ///< If the sample is very short it completely fits into the RAM cache and doesn't need to be streamed from disk, in that case this flag is set to false
            Stream::reference_t         DiskStreamRef;      ///< Reference / link to the disk stream
            int                         RealSampleWordsLeftToRead; ///< Number of samples left to read, not including the silence added for the interpolator
            unsigned long               MaxRAMPos;          ///< The upper allowed limit (not actually the end) in the RAM sample cache, after that point it's not safe to chase the interpolator another time over over the current cache position, instead we switch to disk then.
            bool                        RAMLoop;            ///< If this voice has a loop defined which completely fits into the cached RAM part of the sample, in this case we handle the looping within the voice class, else if the loop is located in the disk stream part, we let the disk stream handle the looping
            //uint                        LoopCyclesLeft;     ///< In case there is a RAMLoop and it's not an endless loop; reflects number of loop cycles left to be passed
            uint                        Delay;              ///< Number of sample points the rendering process of this voice should be delayed (jitter correction), will be set to 0 after the first audio fragment cycle
            EGADSR                      EG1;                ///< Envelope Generator 1 (Amplification)
            EGADSR                      EG2;                ///< Envelope Generator 2 (Filter cutoff frequency)
            EGDecay                     EG3;                ///< Envelope Generator 3 (Pitch)
            midi_ctrl                   VCFCutoffCtrl;
            midi_ctrl                   VCFResonanceCtrl;
            static const float          FILTER_CUTOFF_COEFF;
            LFOUnsigned*                pLFO1;               ///< Low Frequency Oscillator 1 (Amplification)
            LFOUnsigned*                pLFO2;               ///< Low Frequency Oscillator 2 (Filter cutoff frequency)
            LFOSigned*                  pLFO3;               ///< Low Frequency Oscillator 3 (Pitch)
            bool                        bLFO1Enabled;        ///< Should we use the Amplitude LFO for this voice?
            bool                        bLFO2Enabled;        ///< Should we use the Filter Cutoff LFO for this voice?
            bool                        bLFO3Enabled;        ///< Should we use the Pitch LFO for this voice?
            Pool<Event>::Iterator       itTriggerEvent;      ///< First event on the key's list the voice should process (only needed for the first audio fragment in which voice was triggered, after that it will be set to NULL).
        //public: // FIXME: just made public for debugging (sanity check in Engine::RenderAudio()), should be changed to private before the final release
            Pool<Event>::Iterator       itKillEvent;         ///< Event which caused this voice to be killed
        //private:
            int                         SynthesisMode;
            float                       fFinalCutoff;
            float                       fFinalResonance;
            SynthesisParam              finalSynthesisParameters;
            Loop                        loop;

            // Static Methods
            static float CalculateFilterCutoffCoeff();

            // Methods
            void KillImmediately();
            void ProcessEvents(uint Samples);
            void Synthesize(uint Samples, sample_t* pSrc, uint Skip);
            void processTransitionEvents(RTList<Event>::Iterator& itEvent, uint End);
            void processCCEvents(RTList<Event>::Iterator& itEvent, uint End);
            void processPitchEvent(RTList<Event>::Iterator& itEvent);
            void processCrossFadeEvent(RTList<Event>::Iterator& itEvent);
            void processCutoffEvent(RTList<Event>::Iterator& itEvent);
            void processResonanceEvent(RTList<Event>::Iterator& itEvent);

            inline uint8_t CrossfadeAttenuation(uint8_t& CrossfadeControllerValue) {
                uint8_t c = std::max(CrossfadeControllerValue, pDimRgn->AttenuationControllerThreshold);
                c = (!pDimRgn->Crossfade.out_end) ? c /* 0,0,0,0 means no crossfade defined */
                          : (c < pDimRgn->Crossfade.in_end) ?
                                ((c <= pDimRgn->Crossfade.in_start) ? 0
                                : 127 * (c - pDimRgn->Crossfade.in_start) / (pDimRgn->Crossfade.in_end - pDimRgn->Crossfade.in_start))
                          : (c <= pDimRgn->Crossfade.out_start) ? 127
                          : (c < pDimRgn->Crossfade.out_end) ? 127 * (pDimRgn->Crossfade.out_end - c) / (pDimRgn->Crossfade.out_end - pDimRgn->Crossfade.out_start)
                          : 0;
                return pDimRgn->InvertAttenuationController ? 127 - c : c;
            }

            inline float Constrain(float ValueToCheck, float Min, float Max) {
                if      (ValueToCheck > Max) ValueToCheck = Max;
                else if (ValueToCheck < Min) ValueToCheck = Min;
                return ValueToCheck;
            }
    };

}} // namespace LinuxSampler::gig

#endif // __LS_GIG_VOICE_H__
1	schoenebeck	53	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5	schoenebeck	56	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	829	* Copyright (C) 2005, 2006 Christian Schoenebeck *
7	schoenebeck	53	* *
8			* This program is free software; you can redistribute it and/or modify *
9			* it under the terms of the GNU General Public License as published by *
10			* the Free Software Foundation; either version 2 of the License, or *
11			* (at your option) any later version. *
12			* *
13			* This program is distributed in the hope that it will be useful, *
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16			* GNU General Public License for more details. *
17			* *
18			* You should have received a copy of the GNU General Public License *
19			* along with this program; if not, write to the Free Software *
20			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21			* MA 02111-1307 USA *
22			***************************************************************************/
23
24			#ifndef __LS_GIG_VOICE_H__
25			#define __LS_GIG_VOICE_H__
26
27			#include "../../common/global.h"
28
29	schoenebeck	505	#include <gig.h>
30
31	schoenebeck	53	#include "../../common/RTMath.h"
32			#include "../../common/RingBuffer.h"
33	schoenebeck	273	#include "../../common/Pool.h"
34	schoenebeck	203	#include "../../drivers/audio/AudioOutputDevice.h"
35	schoenebeck	80	#include "../common/BiquadFilter.h"
36	schoenebeck	53	#include "Engine.h"
37	schoenebeck	411	#include "EngineChannel.h"
38	schoenebeck	53	#include "Stream.h"
39			#include "DiskThread.h"
40	schoenebeck	738	#include "EGADSR.h"
41	schoenebeck	53	#include "EGDecay.h"
42			#include "Filter.h"
43	schoenebeck	738	#include "../common/LFOBase.h"
44	schoenebeck	770	#include "SynthesisParam.h"
45	persson	832	#include "SmoothVolume.h"
46	schoenebeck	53
47	schoenebeck	738	// include the appropriate (unsigned) triangle LFO implementation
48			#if CONFIG_UNSIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
49			# include "../common/LFOTriangleIntMath.h"
50			#elif CONFIG_UNSIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
51			# include "../common/LFOTriangleIntAbsMath.h"
52			#elif CONFIG_UNSIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
53			# include "../common/LFOTriangleDiHarmonic.h"
54			#else
55			# error "Unknown or no (unsigned) triangle LFO implementation selected!"
56			#endif
57
58			// include the appropriate (signed) triangle LFO implementation
59			#if CONFIG_SIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
60			# include "../common/LFOTriangleIntMath.h"
61			#elif CONFIG_SIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
62			# include "../common/LFOTriangleIntAbsMath.h"
63			#elif CONFIG_SIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
64			# include "../common/LFOTriangleDiHarmonic.h"
65			#else
66			# error "Unknown or no (signed) triangle LFO implementation selected!"
67			#endif
68
69	schoenebeck	53	namespace LinuxSampler { namespace gig {
70
71			class Engine;
72
73			/// Reflects a MIDI controller
74			struct midi_ctrl {
75			uint8_t controller; ///< MIDI control change controller number
76			uint8_t value; ///< Current MIDI controller value
77			float fvalue; ///< Transformed / effective value (e.g. volume level or filter cutoff frequency)
78			};
79
80	schoenebeck	738	#if CONFIG_UNSIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
81			typedef LFOTriangleIntMath<range_unsigned> LFOUnsigned;
82			#elif CONFIG_UNSIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
83			typedef LFOTriangleIntAbsMath<range_unsigned> LFOUnsigned;
84			#elif CONFIG_UNSIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
85			typedef LFOTriangleDiHarmonic<range_unsigned> LFOUnsigned;
86			#endif
87
88			#if CONFIG_SIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
89			typedef LFOTriangleIntMath<range_signed> LFOSigned;
90			#elif CONFIG_SIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
91			typedef LFOTriangleIntAbsMath<range_signed> LFOSigned;
92			#elif CONFIG_SIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
93			typedef LFOTriangleDiHarmonic<range_signed> LFOSigned;
94			#endif
95
96	schoenebeck	53	/** Gig Voice
97			*
98			* Renders a voice for the Gigasampler format.
99			*/
100			class Voice {
101			public:
102	schoenebeck	242	// Types
103			enum type_t {
104			type_normal,
105			type_release_trigger_required, ///< If the key of this voice will be released, it causes a release triggered voice to be spawned
106			type_release_trigger ///< Release triggered voice which cannot be killed by releasing its key
107			};
108	persson	832
109	schoenebeck	53	// Attributes
110	schoenebeck	242	type_t Type; ///< Voice Type
111	schoenebeck	53	int MIDIKey; ///< MIDI key number of the key that triggered the voice
112	schoenebeck	239	uint KeyGroup;
113	schoenebeck	53	DiskThread* pDiskThread; ///< Pointer to the disk thread, to be able to order a disk stream and later to delete the stream again
114
115			// Methods
116			Voice();
117	letz	502	virtual ~Voice();
118	schoenebeck	271	void Kill(Pool<Event>::Iterator& itKillEvent);
119	schoenebeck	53	void Render(uint Samples);
120			void Reset();
121			void SetOutput(AudioOutputDevice* pAudioOutputDevice);
122			void SetEngine(Engine* pEngine);
123	schoenebeck	669	int Trigger(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent, int PitchBend, ::gig::DimensionRegion* pDimRgn, type_t VoiceType, int iKeyGroup);
124	schoenebeck	285	inline bool IsActive() { return PlaybackState; }
125	schoenebeck	663	inline bool IsStealable() { return !itKillEvent && PlaybackState >= playback_state_ram; }
126	schoenebeck	829	void UpdatePortamentoPos(Pool<Event>::Iterator& itNoteOffEvent);
127
128	schoenebeck	319	//private:
129	schoenebeck	53	// Types
130			enum playback_state_t {
131	schoenebeck	285	playback_state_end = 0,
132	schoenebeck	563	playback_state_init = 1,
133			playback_state_ram = 2,
134			playback_state_disk = 3
135	schoenebeck	53	};
136
137			// Attributes
138	schoenebeck	411	EngineChannel* pEngineChannel;
139			Engine* pEngine; ///< Pointer to the sampler engine, to be able to access the event lists.
140	persson	832	float VolumeLeft; ///< Left channel volume. This factor is calculated when the voice is triggered and doesn't change after that.
141			float VolumeRight; ///< Right channel volume. This factor is calculated when the voice is triggered and doesn't change after that.
142			SmoothVolume CrossfadeSmoother; ///< Crossfade volume, updated by crossfade CC events
143			SmoothVolume VolumeSmoother; ///< Volume, updated by CC 7 (volume) events
144			SmoothVolume PanLeftSmoother; ///< Left channel volume, updated by CC 10 (pan) events
145			SmoothVolume PanRightSmoother; ///< Right channel volume, updated by CC 10 (pan) events
146	persson	783	double Pos; ///< Current playback position in sample
147	schoenebeck	319	float PitchBase; ///< Basic pitch depth, stays the same for the whole life time of the voice
148			float PitchBend; ///< Current pitch value of the pitchbend wheel
149	persson	729	float CutoffBase; ///< Cutoff frequency before control change, EG and LFO are applied
150	schoenebeck	53	::gig::Sample* pSample; ///< Pointer to the sample to be played back
151	schoenebeck	236	::gig::DimensionRegion* pDimRgn; ///< Pointer to the articulation information of current dimension region of this voice
152	schoenebeck	53	playback_state_t PlaybackState; ///< When a sample will be triggered, it will be first played from RAM cache and after a couple of sample points it will switch to disk streaming and at the end of a disk stream we have to add null samples, so the interpolator can do it's work correctly
153			bool DiskVoice; ///< If the sample is very short it completely fits into the RAM cache and doesn't need to be streamed from disk, in that case this flag is set to false
154			Stream::reference_t DiskStreamRef; ///< Reference / link to the disk stream
155	schoenebeck	330	int RealSampleWordsLeftToRead; ///< Number of samples left to read, not including the silence added for the interpolator
156	schoenebeck	53	unsigned long MaxRAMPos; ///< The upper allowed limit (not actually the end) in the RAM sample cache, after that point it's not safe to chase the interpolator another time over over the current cache position, instead we switch to disk then.
157			bool RAMLoop; ///< If this voice has a loop defined which completely fits into the cached RAM part of the sample, in this case we handle the looping within the voice class, else if the loop is located in the disk stream part, we let the disk stream handle the looping
158	schoenebeck	770	//uint LoopCyclesLeft; ///< In case there is a RAMLoop and it's not an endless loop; reflects number of loop cycles left to be passed
159	schoenebeck	53	uint Delay; ///< Number of sample points the rendering process of this voice should be delayed (jitter correction), will be set to 0 after the first audio fragment cycle
160	schoenebeck	738	EGADSR EG1; ///< Envelope Generator 1 (Amplification)
161			EGADSR EG2; ///< Envelope Generator 2 (Filter cutoff frequency)
162			EGDecay EG3; ///< Envelope Generator 3 (Pitch)
163	schoenebeck	53	midi_ctrl VCFCutoffCtrl;
164			midi_ctrl VCFResonanceCtrl;
165			static const float FILTER_CUTOFF_COEFF;
166	schoenebeck	738	LFOUnsigned* pLFO1; ///< Low Frequency Oscillator 1 (Amplification)
167			LFOUnsigned* pLFO2; ///< Low Frequency Oscillator 2 (Filter cutoff frequency)
168			LFOSigned* pLFO3; ///< Low Frequency Oscillator 3 (Pitch)
169	schoenebeck	687	bool bLFO1Enabled; ///< Should we use the Amplitude LFO for this voice?
170			bool bLFO2Enabled; ///< Should we use the Filter Cutoff LFO for this voice?
171			bool bLFO3Enabled; ///< Should we use the Pitch LFO for this voice?
172	schoenebeck	271	Pool<Event>::Iterator itTriggerEvent; ///< First event on the key's list the voice should process (only needed for the first audio fragment in which voice was triggered, after that it will be set to NULL).
173	schoenebeck	319	//public: // FIXME: just made public for debugging (sanity check in Engine::RenderAudio()), should be changed to private before the final release
174	schoenebeck	271	Pool<Event>::Iterator itKillEvent; ///< Event which caused this voice to be killed
175	schoenebeck	319	//private:
176			int SynthesisMode;
177	schoenebeck	738	float fFinalCutoff;
178			float fFinalResonance;
179	schoenebeck	770	SynthesisParam finalSynthesisParameters;
180			Loop loop;
181	schoenebeck	738
182	schoenebeck	53	// Static Methods
183			static float CalculateFilterCutoffCoeff();
184
185			// Methods
186	schoenebeck	319	void KillImmediately();
187			void ProcessEvents(uint Samples);
188	senkov	325	void Synthesize(uint Samples, sample_t* pSrc, uint Skip);
189	schoenebeck	738	void processTransitionEvents(RTList<Event>::Iterator& itEvent, uint End);
190			void processCCEvents(RTList<Event>::Iterator& itEvent, uint End);
191			void processPitchEvent(RTList<Event>::Iterator& itEvent);
192			void processCrossFadeEvent(RTList<Event>::Iterator& itEvent);
193			void processCutoffEvent(RTList<Event>::Iterator& itEvent);
194			void processResonanceEvent(RTList<Event>::Iterator& itEvent);
195	schoenebeck	245
196	persson	832	inline uint8_t CrossfadeAttenuation(uint8_t& CrossfadeControllerValue) {
197	persson	831	uint8_t c = std::max(CrossfadeControllerValue, pDimRgn->AttenuationControllerThreshold);
198	persson	832	c = (!pDimRgn->Crossfade.out_end) ? c /* 0,0,0,0 means no crossfade defined */
199	persson	831	: (c < pDimRgn->Crossfade.in_end) ?
200	persson	832	((c <= pDimRgn->Crossfade.in_start) ? 0
201			: 127 * (c - pDimRgn->Crossfade.in_start) / (pDimRgn->Crossfade.in_end - pDimRgn->Crossfade.in_start))
202			: (c <= pDimRgn->Crossfade.out_start) ? 127
203			: (c < pDimRgn->Crossfade.out_end) ? 127 * (pDimRgn->Crossfade.out_end - c) / (pDimRgn->Crossfade.out_end - pDimRgn->Crossfade.out_start)
204			: 0;
205			return pDimRgn->InvertAttenuationController ? 127 - c : c;
206	schoenebeck	236	}
207
208	schoenebeck	53	inline float Constrain(float ValueToCheck, float Min, float Max) {
209			if (ValueToCheck > Max) ValueToCheck = Max;
210			else if (ValueToCheck < Min) ValueToCheck = Min;
211			return ValueToCheck;
212			}
213			};
214
215			}} // namespace LinuxSampler::gig
216
217			#endif // __LS_GIG_VOICE_H__