engines/common/AbstractVoice.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck    *
 *   Copyright (C) 2005-2008 Christian Schoenebeck                         *
 *   Copyright (C) 2009-2012 Christian Schoenebeck and Grigor Iliev        *
 *                                                                         *
 *   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_ABSTRACTVOICE_H__
#define __LS_ABSTRACTVOICE_H__

#include "Voice.h"

#include "../../common/global_private.h"
#include "../AbstractEngineChannel.h"
#include "../common/LFOBase.h"
#include "../EngineBase.h"
#include "EG.h"
#include "../gig/EGADSR.h"
#include "../gig/EGDecay.h"
#include "../gig/SmoothVolume.h"
#include "../gig/Synthesizer.h"
#include "../gig/Profiler.h"
#include "SignalUnitRack.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 {

    #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

    class AbstractVoice : public Voice {
        public:
            type_t       Type;         ///< Voice Type (bit field, a voice may have several types)
            NoteBase*    pNote;        ///< Note this voice belongs to and was caused by.
            int          MIDIPan;      ///< the current MIDI pan value plus the value from RegionInfo

            SignalUnitRack* const pSignalUnitRack;

            AbstractVoice(SignalUnitRack* pRack);
            virtual ~AbstractVoice();

            inline bool IsActive() { return PlaybackState; }
            inline bool IsStealable() { return !itKillEvent && PlaybackState >= playback_state_ram; }

            virtual void Reset();

            virtual int Trigger (
                AbstractEngineChannel*  pEngineChannel,
                Pool<Event>::Iterator&  itNoteOnEvent,
                int                     PitchBend,
                type_t                  VoiceType,
                int                     iKeyGroup
            );

            /** Invoked when the voice is freed - gone from active to inactive. */
            virtual void VoiceFreed() { }

            virtual void Synthesize(uint Samples, sample_t* pSrc, uint Skip);
            
            uint GetSampleRate() { return GetEngine()->SampleRate; }
            
            uint8_t GetControllerValue(uint8_t Controller) {
                return (Controller > 128) ? 0 : pEngineChannel->ControllerTable[Controller];
            }

            /// Keyboard key on which this voice should listen to transitional events (i.e. note-off events to release the voice).
            inline uint8_t HostKey() const { return pNote->hostKey; }
            /// Keyboard key which the voice should use for calculating any synthesis relevant parameters (i.e. pitch).
            inline uint8_t MIDIKey() const { return pNote->cause.Param.Note.Key; }
            /// MIDI note-on velocity value which the voice should use for calculating any synthesis relevant parameters (i.e. amplitude).
            inline uint8_t MIDIVelocity() const { return pNote->cause.Param.Note.Velocity; }

            void processCCEvents(RTList<Event>::Iterator& itEvent, uint End);
            void processPitchEvent(RTList<Event>::Iterator& itEvent);
            void processResonanceEvent(RTList<Event>::Iterator& itEvent);
            void processTransitionEvents(RTList<Event>::Iterator& itEvent, uint End);
            void processGroupEvents(RTList<Event>::Iterator& itEvent, uint End);
            void UpdatePortamentoPos(Pool<Event>::Iterator& itNoteOffEvent);
            void Kill(Pool<Event>::Iterator& itKillEvent);
            void CreateEq();
            void onScaleTuningChanged();

            bool                Orphan;             ///< true if this voice is playing a sample from an instrument that is unloaded. When the voice dies, the sample (and dimension region) will be handed back to the instrument resource manager.
            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
            Stream::reference_t DiskStreamRef;      ///< Reference / link to the disk stream

            template<class TV, class TRR, class TR, class TD, class TIM, class TI> friend class EngineBase;

        protected:
            SampleInfo      SmplInfo;
            RegionInfo      RgnInfo;
            InstrumentInfo  InstrInfo;
            AbstractEngineChannel* pEngineChannel;

            double                      Pos;                ///< Current playback position in sample
            PitchInfo                   Pitch;
            float                       NotePitch;          ///< Updated by calls to built-in instrument script function change_tune() (defaults to 1.0, that is neutral).
            float                       CutoffBase;         ///< Cutoff frequency before control change, EG and LFO are applied
            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.
            float                       NotePanLeft;        ///< Updated by calls to built-in instrument script function change_pan() (defaults to 1.0, that is neutral).
            float                       NotePanRight;       ///< Updated by calls to built-in instrument script function change_pan() (defaults to 1.0, that is neutral).
            gig::SmoothVolume           CrossfadeSmoother;  ///< Crossfade volume, updated by crossfade CC events
            gig::SmoothVolume           VolumeSmoother;     ///< Volume, updated by CC 7 (volume) events
            gig::SmoothVolume           PanLeftSmoother;    ///< Left channel volume, updated by CC 10 (pan) events and change_pan() real-time instrument script calls.
            gig::SmoothVolume           PanRightSmoother;   ///< Right channel volume, updated by CC 10 (pan) events and change_pan() real-time instrument script calls.
            gig::SmoothVolume           NoteVolumeSmoother; ///< Note's global volume, updated by change_vol() real-time instrument script calls.
            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
            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
            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.
            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
            EG*                         pEG1;               ///< Envelope Generator 1 (Amplification)
            EG*                         pEG2;               ///< Envelope Generator 2 (Filter cutoff frequency)
            gig::EGDecay                EG3;                ///< Envelope Generator 3 (Pitch) TODO: use common EG instead?
            midi_ctrl                   VCFCutoffCtrl;
            midi_ctrl                   VCFResonanceCtrl;
            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).
            Pool<Event>::Iterator       itKillEvent;         ///< Event which caused this voice to be killed
            int                         SynthesisMode;
            float                       fFinalCutoff;
            float                       fFinalResonance;
            gig::SynthesisParam         finalSynthesisParameters;
            gig::Loop                   loop;
            RTList<Event>*              pGroupEvents;        ///< Events directed to an exclusive group
            
            EqSupport* pEq;         ///< Used for per voice equalization
            bool       bEqSupport;
            
            void PrintEqInfo() {
                if (!bEqSupport || pEq == NULL) {
                    dmsg(1,("EQ support: no\n"));
                } else {
                    pEq->PrintInfo();
                }
            }

            virtual AbstractEngine* GetEngine() = 0;
            virtual SampleInfo      GetSampleInfo() = 0;
            virtual RegionInfo      GetRegionInfo() = 0;
            virtual InstrumentInfo  GetInstrumentInfo() = 0;

            /**
             * Most of the important members of the voice are set when the voice
             * is triggered (like pEngineChannel, pRegion, pSample, etc).
             * This method is called after these members are set and before
             * the voice is actually triggered.
             * Override this method if you need to do some additional
             * initialization which depends on these members before the voice
             * is triggered.
             */
            virtual void AboutToTrigger() { }

            virtual bool EG1Finished(); 

            /**
             * Gets the sample cache size in bytes.
             */
            virtual unsigned long GetSampleCacheSize() = 0;
            
            /**
             * Because in most cases we cache part of the sample in RAM, if the
             * offset is too big (will extend beyond the RAM cache if the cache contains
             * the beginning of the sample) we should cache in the RAM buffer not the
             * beginning of the sample but a part that starts from the sample offset point.
             * In that case the current sample position should start from zero (Pos).
             * When the offset fits into RAM buffer or the whole sample is cached
             * in RAM, Pos should contain the actual offset.
             * We don't trim the sample because it might have a defined
             * loop start point before the start point of the playback.
             */
            virtual void SetSampleStartOffset();

            /**
             * Returns the correct amplitude factor for the given \a MIDIKeyVelocity.
             * All involved parameters (VelocityResponseCurve, VelocityResponseDepth
             * and VelocityResponseCurveScaling) involved are taken into account to
             * calculate the amplitude factor. Use this method when a key was
             * triggered to get the volume with which the sample should be played
             * back.
             *
             * @param MIDIKeyVelocity  MIDI velocity value of the triggered key (between 0 and 127)
             * @returns                amplitude factor (between 0.0 and 1.0)
             */
            virtual double GetVelocityAttenuation(uint8_t MIDIKeyVelocity) = 0;

            virtual double GetSampleAttenuation() = 0;

            virtual double CalculateVolume(double velocityAttenuation);

            virtual float GetReleaseTriggerAttenuation(float noteLength);

            /**
             * Get starting crossfade volume level
             */
            virtual double CalculateCrossfadeVolume(uint8_t MIDIKeyVelocity) = 0;

            virtual MidiKeyBase* GetMidiKeyInfo(int MIDIKey) = 0;

            virtual int   OrderNewStream() = 0;

            virtual PitchInfo CalculatePitchInfo(int PitchBend);

            // TODO: cleanup the interface. The following two methods
            // are maybe not neccessary after the TriggerEG1 method
            // was added.

            /**
             * Get current value of EG1 controller.
             */
            virtual double GetEG1ControllerValue(uint8_t MIDIKeyVelocity) = 0;

            /**
             * Calculate influence of EG1 controller on EG1's parameters.
             */
            virtual EGInfo CalculateEG1ControllerInfluence(double eg1ControllerValue) = 0;

            // TODO: cleanup the interface. The velrelase and
            // velocityAttenuation parameters are perhaps too gig
            // specific.
            /**
             * Trigger the amplitude envelope generator.
             */
            virtual void TriggerEG1(const EGInfo& egInfo, double velrelease, double velocityAttenuation, uint sampleRate, uint8_t velocity) = 0;

            /**
             * Get current value of EG2 controller.
             */
            virtual double GetEG2ControllerValue(uint8_t MIDIKeyVelocity) = 0;

            /**
             * Calculate influence of EG2 controller on EG2's parameters.
             */
            virtual EGInfo CalculateEG2ControllerInfluence(double eg2ControllerValue) = 0;

            virtual void TriggerEG2(const EGInfo& egInfo, double velrelease, double velocityAttenuation, uint sampleRate, uint8_t velocity) = 0;

            virtual float CalculateCutoffBase(uint8_t MIDIKeyVelocity) = 0;
            virtual float CalculateFinalCutoff(float cutoffBase) = 0;

            virtual void InitLFO1() = 0;
            virtual void InitLFO2() = 0;
            virtual void InitLFO3() = 0;

            virtual uint8_t GetVCFCutoffCtrl() = 0;
            virtual uint8_t GetVCFResonanceCtrl() = 0;
            virtual uint8_t CrossfadeAttenuation(uint8_t& CrossfadeControllerValue) = 0;

            virtual void    GetFirstEventOnKey(uint8_t MIDIKey, RTList<Event>::Iterator& itEvent) = 0;
            virtual void    ProcessCCEvent(RTList<Event>::Iterator& itEvent) = 0;
            virtual void    ProcessChannelPressureEvent(RTList<Event>::Iterator& itEvent) = 0;
            virtual void    ProcessPolyphonicKeyPressureEvent(RTList<Event>::Iterator& itEvent) = 0;
            virtual void    ProcessCutoffEvent(RTList<Event>::Iterator& itEvent) = 0;
            virtual double  GetVelocityRelease(uint8_t MIDIKeyVelocity) = 0;

            virtual unsigned long GetNoteOnTime(int MIDIKey) = 0;

            virtual void    ProcessGroupEvent(RTList<Event>::Iterator& itEvent) = 0;
            void            EnterReleaseStage();

            virtual int     CalculatePan(uint8_t pan) = 0;
    };
} // namespace LinuxSampler

#endif  /* __LS_ABSTRACTVOICE_H__ */
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005-2008 Christian Schoenebeck *
7	* Copyright (C) 2009-2012 Christian Schoenebeck and Grigor Iliev *
8	* *
9	* This program is free software; you can redistribute it and/or modify *
10	* it under the terms of the GNU General Public License as published by *
11	* the Free Software Foundation; either version 2 of the License, or *
12	* (at your option) any later version. *
13	* *
14	* This program is distributed in the hope that it will be useful, *
15	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
17	* GNU General Public License for more details. *
18	* *
19	* You should have received a copy of the GNU General Public License *
20	* along with this program; if not, write to the Free Software *
21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
22	* MA 02111-1307 USA *
23	***************************************************************************/
24
25	#ifndef __LS_ABSTRACTVOICE_H__
26	#define __LS_ABSTRACTVOICE_H__
27
28	#include "Voice.h"
29
30	#include "../../common/global_private.h"
31	#include "../AbstractEngineChannel.h"
32	#include "../common/LFOBase.h"
33	#include "../EngineBase.h"
34	#include "EG.h"
35	#include "../gig/EGADSR.h"
36	#include "../gig/EGDecay.h"
37	#include "../gig/SmoothVolume.h"
38	#include "../gig/Synthesizer.h"
39	#include "../gig/Profiler.h"
40	#include "SignalUnitRack.h"
41
42	// include the appropriate (unsigned) triangle LFO implementation
43	#if CONFIG_UNSIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
44	# include "../common/LFOTriangleIntMath.h"
45	#elif CONFIG_UNSIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
46	# include "../common/LFOTriangleIntAbsMath.h"
47	#elif CONFIG_UNSIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
48	# include "../common/LFOTriangleDiHarmonic.h"
49	#else
50	# error "Unknown or no (unsigned) triangle LFO implementation selected!"
51	#endif
52
53	// include the appropriate (signed) triangle LFO implementation
54	#if CONFIG_SIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
55	# include "../common/LFOTriangleIntMath.h"
56	#elif CONFIG_SIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
57	# include "../common/LFOTriangleIntAbsMath.h"
58	#elif CONFIG_SIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
59	# include "../common/LFOTriangleDiHarmonic.h"
60	#else
61	# error "Unknown or no (signed) triangle LFO implementation selected!"
62	#endif
63
64	namespace LinuxSampler {
65
66	#if CONFIG_UNSIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
67	typedef LFOTriangleIntMath<range_unsigned> LFOUnsigned;
68	#elif CONFIG_UNSIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
69	typedef LFOTriangleIntAbsMath<range_unsigned> LFOUnsigned;
70	#elif CONFIG_UNSIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
71	typedef LFOTriangleDiHarmonic<range_unsigned> LFOUnsigned;
72	#endif
73
74	#if CONFIG_SIGNED_TRIANG_ALGO == INT_MATH_SOLUTION
75	typedef LFOTriangleIntMath<range_signed> LFOSigned;
76	#elif CONFIG_SIGNED_TRIANG_ALGO == INT_ABS_MATH_SOLUTION
77	typedef LFOTriangleIntAbsMath<range_signed> LFOSigned;
78	#elif CONFIG_SIGNED_TRIANG_ALGO == DI_HARMONIC_SOLUTION
79	typedef LFOTriangleDiHarmonic<range_signed> LFOSigned;
80	#endif
81
82	class AbstractVoice : public Voice {
83	public:
84	type_t Type; ///< Voice Type (bit field, a voice may have several types)
85	NoteBase* pNote; ///< Note this voice belongs to and was caused by.
86	int MIDIPan; ///< the current MIDI pan value plus the value from RegionInfo
87
88	SignalUnitRack* const pSignalUnitRack;
89
90	AbstractVoice(SignalUnitRack* pRack);
91	virtual ~AbstractVoice();
92
93	inline bool IsActive() { return PlaybackState; }
94	inline bool IsStealable() { return !itKillEvent && PlaybackState >= playback_state_ram; }
95
96	virtual void Reset();
97
98	virtual int Trigger (
99	AbstractEngineChannel* pEngineChannel,
100	Pool<Event>::Iterator& itNoteOnEvent,
101	int PitchBend,
102	type_t VoiceType,
103	int iKeyGroup
104	);
105
106	/** Invoked when the voice is freed - gone from active to inactive. */
107	virtual void VoiceFreed() { }
108
109	virtual void Synthesize(uint Samples, sample_t* pSrc, uint Skip);
110
111	uint GetSampleRate() { return GetEngine()->SampleRate; }
112
113	uint8_t GetControllerValue(uint8_t Controller) {
114	return (Controller > 128) ? 0 : pEngineChannel->ControllerTable[Controller];
115	}
116
117	/// Keyboard key on which this voice should listen to transitional events (i.e. note-off events to release the voice).
118	inline uint8_t HostKey() const { return pNote->hostKey; }
119	/// Keyboard key which the voice should use for calculating any synthesis relevant parameters (i.e. pitch).
120	inline uint8_t MIDIKey() const { return pNote->cause.Param.Note.Key; }
121	/// MIDI note-on velocity value which the voice should use for calculating any synthesis relevant parameters (i.e. amplitude).
122	inline uint8_t MIDIVelocity() const { return pNote->cause.Param.Note.Velocity; }
123
124	void processCCEvents(RTList<Event>::Iterator& itEvent, uint End);
125	void processPitchEvent(RTList<Event>::Iterator& itEvent);
126	void processResonanceEvent(RTList<Event>::Iterator& itEvent);
127	void processTransitionEvents(RTList<Event>::Iterator& itEvent, uint End);
128	void processGroupEvents(RTList<Event>::Iterator& itEvent, uint End);
129	void UpdatePortamentoPos(Pool<Event>::Iterator& itNoteOffEvent);
130	void Kill(Pool<Event>::Iterator& itKillEvent);
131	void CreateEq();
132	void onScaleTuningChanged();
133
134	bool Orphan; ///< true if this voice is playing a sample from an instrument that is unloaded. When the voice dies, the sample (and dimension region) will be handed back to the instrument resource manager.
135	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
136	Stream::reference_t DiskStreamRef; ///< Reference / link to the disk stream
137
138	template<class TV, class TRR, class TR, class TD, class TIM, class TI> friend class EngineBase;
139
140	protected:
141	SampleInfo SmplInfo;
142	RegionInfo RgnInfo;
143	InstrumentInfo InstrInfo;
144	AbstractEngineChannel* pEngineChannel;
145
146	double Pos; ///< Current playback position in sample
147	PitchInfo Pitch;
148	float NotePitch; ///< Updated by calls to built-in instrument script function change_tune() (defaults to 1.0, that is neutral).
149	float CutoffBase; ///< Cutoff frequency before control change, EG and LFO are applied
150	float VolumeLeft; ///< Left channel volume. This factor is calculated when the voice is triggered and doesn't change after that.
151	float VolumeRight; ///< Right channel volume. This factor is calculated when the voice is triggered and doesn't change after that.
152	float NotePanLeft; ///< Updated by calls to built-in instrument script function change_pan() (defaults to 1.0, that is neutral).
153	float NotePanRight; ///< Updated by calls to built-in instrument script function change_pan() (defaults to 1.0, that is neutral).
154	gig::SmoothVolume CrossfadeSmoother; ///< Crossfade volume, updated by crossfade CC events
155	gig::SmoothVolume VolumeSmoother; ///< Volume, updated by CC 7 (volume) events
156	gig::SmoothVolume PanLeftSmoother; ///< Left channel volume, updated by CC 10 (pan) events and change_pan() real-time instrument script calls.
157	gig::SmoothVolume PanRightSmoother; ///< Right channel volume, updated by CC 10 (pan) events and change_pan() real-time instrument script calls.
158	gig::SmoothVolume NoteVolumeSmoother; ///< Note's global volume, updated by change_vol() real-time instrument script calls.
159	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
160	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
161	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.
162	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
163	EG* pEG1; ///< Envelope Generator 1 (Amplification)
164	EG* pEG2; ///< Envelope Generator 2 (Filter cutoff frequency)
165	gig::EGDecay EG3; ///< Envelope Generator 3 (Pitch) TODO: use common EG instead?
166	midi_ctrl VCFCutoffCtrl;
167	midi_ctrl VCFResonanceCtrl;
168	LFOUnsigned* pLFO1; ///< Low Frequency Oscillator 1 (Amplification)
169	LFOUnsigned* pLFO2; ///< Low Frequency Oscillator 2 (Filter cutoff frequency)
170	LFOSigned* pLFO3; ///< Low Frequency Oscillator 3 (Pitch)
171	bool bLFO1Enabled; ///< Should we use the Amplitude LFO for this voice?
172	bool bLFO2Enabled; ///< Should we use the Filter Cutoff LFO for this voice?
173	bool bLFO3Enabled; ///< Should we use the Pitch LFO for this voice?
174	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).
175	Pool<Event>::Iterator itKillEvent; ///< Event which caused this voice to be killed
176	int SynthesisMode;
177	float fFinalCutoff;
178	float fFinalResonance;
179	gig::SynthesisParam finalSynthesisParameters;
180	gig::Loop loop;
181	RTList<Event>* pGroupEvents; ///< Events directed to an exclusive group
182
183	EqSupport* pEq; ///< Used for per voice equalization
184	bool bEqSupport;
185
186	void PrintEqInfo() {
187	if (!bEqSupport \|\| pEq == NULL) {
188	dmsg(1,("EQ support: no\n"));
189	} else {
190	pEq->PrintInfo();
191	}
192	}
193
194	virtual AbstractEngine* GetEngine() = 0;
195	virtual SampleInfo GetSampleInfo() = 0;
196	virtual RegionInfo GetRegionInfo() = 0;
197	virtual InstrumentInfo GetInstrumentInfo() = 0;
198
199	/**
200	* Most of the important members of the voice are set when the voice
201	* is triggered (like pEngineChannel, pRegion, pSample, etc).
202	* This method is called after these members are set and before
203	* the voice is actually triggered.
204	* Override this method if you need to do some additional
205	* initialization which depends on these members before the voice
206	* is triggered.
207	*/
208	virtual void AboutToTrigger() { }
209
210	virtual bool EG1Finished();
211
212	/**
213	* Gets the sample cache size in bytes.
214	*/
215	virtual unsigned long GetSampleCacheSize() = 0;
216
217	/**
218	* Because in most cases we cache part of the sample in RAM, if the
219	* offset is too big (will extend beyond the RAM cache if the cache contains
220	* the beginning of the sample) we should cache in the RAM buffer not the
221	* beginning of the sample but a part that starts from the sample offset point.
222	* In that case the current sample position should start from zero (Pos).
223	* When the offset fits into RAM buffer or the whole sample is cached
224	* in RAM, Pos should contain the actual offset.
225	* We don't trim the sample because it might have a defined
226	* loop start point before the start point of the playback.
227	*/
228	virtual void SetSampleStartOffset();
229
230	/**
231	* Returns the correct amplitude factor for the given \a MIDIKeyVelocity.
232	* All involved parameters (VelocityResponseCurve, VelocityResponseDepth
233	* and VelocityResponseCurveScaling) involved are taken into account to
234	* calculate the amplitude factor. Use this method when a key was
235	* triggered to get the volume with which the sample should be played
236	* back.
237	*
238	* @param MIDIKeyVelocity MIDI velocity value of the triggered key (between 0 and 127)
239	* @returns amplitude factor (between 0.0 and 1.0)
240	*/
241	virtual double GetVelocityAttenuation(uint8_t MIDIKeyVelocity) = 0;
242
243	virtual double GetSampleAttenuation() = 0;
244
245	virtual double CalculateVolume(double velocityAttenuation);
246
247	virtual float GetReleaseTriggerAttenuation(float noteLength);
248
249	/**
250	* Get starting crossfade volume level
251	*/
252	virtual double CalculateCrossfadeVolume(uint8_t MIDIKeyVelocity) = 0;
253
254	virtual MidiKeyBase* GetMidiKeyInfo(int MIDIKey) = 0;
255
256	virtual int OrderNewStream() = 0;
257
258	virtual PitchInfo CalculatePitchInfo(int PitchBend);
259
260	// TODO: cleanup the interface. The following two methods
261	// are maybe not neccessary after the TriggerEG1 method
262	// was added.
263
264	/**
265	* Get current value of EG1 controller.
266	*/
267	virtual double GetEG1ControllerValue(uint8_t MIDIKeyVelocity) = 0;
268
269	/**
270	* Calculate influence of EG1 controller on EG1's parameters.
271	*/
272	virtual EGInfo CalculateEG1ControllerInfluence(double eg1ControllerValue) = 0;
273
274	// TODO: cleanup the interface. The velrelase and
275	// velocityAttenuation parameters are perhaps too gig
276	// specific.
277	/**
278	* Trigger the amplitude envelope generator.
279	*/
280	virtual void TriggerEG1(const EGInfo& egInfo, double velrelease, double velocityAttenuation, uint sampleRate, uint8_t velocity) = 0;
281
282	/**
283	* Get current value of EG2 controller.
284	*/
285	virtual double GetEG2ControllerValue(uint8_t MIDIKeyVelocity) = 0;
286
287	/**
288	* Calculate influence of EG2 controller on EG2's parameters.
289	*/
290	virtual EGInfo CalculateEG2ControllerInfluence(double eg2ControllerValue) = 0;
291
292	virtual void TriggerEG2(const EGInfo& egInfo, double velrelease, double velocityAttenuation, uint sampleRate, uint8_t velocity) = 0;
293
294	virtual float CalculateCutoffBase(uint8_t MIDIKeyVelocity) = 0;
295	virtual float CalculateFinalCutoff(float cutoffBase) = 0;
296
297	virtual void InitLFO1() = 0;
298	virtual void InitLFO2() = 0;
299	virtual void InitLFO3() = 0;
300
301	virtual uint8_t GetVCFCutoffCtrl() = 0;
302	virtual uint8_t GetVCFResonanceCtrl() = 0;
303	virtual uint8_t CrossfadeAttenuation(uint8_t& CrossfadeControllerValue) = 0;
304
305	virtual void GetFirstEventOnKey(uint8_t MIDIKey, RTList<Event>::Iterator& itEvent) = 0;
306	virtual void ProcessCCEvent(RTList<Event>::Iterator& itEvent) = 0;
307	virtual void ProcessChannelPressureEvent(RTList<Event>::Iterator& itEvent) = 0;
308	virtual void ProcessPolyphonicKeyPressureEvent(RTList<Event>::Iterator& itEvent) = 0;
309	virtual void ProcessCutoffEvent(RTList<Event>::Iterator& itEvent) = 0;
310	virtual double GetVelocityRelease(uint8_t MIDIKeyVelocity) = 0;
311
312	virtual unsigned long GetNoteOnTime(int MIDIKey) = 0;
313
314	virtual void ProcessGroupEvent(RTList<Event>::Iterator& itEvent) = 0;
315	void EnterReleaseStage();
316
317	virtual int CalculatePan(uint8_t pan) = 0;
318	};
319	} // namespace LinuxSampler
320
321	#endif /* __LS_ABSTRACTVOICE_H__ */