engines/sfz/EGADSR.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2010 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., 51 Franklin St, Fifth Floor, Boston,                *
 *   MA  02110-1301  USA                                                   *
 ***************************************************************************/

#include "EGADSR.h"

#include "../../common/global_private.h"

namespace LinuxSampler { namespace sfz {

    // Modeled after output from SFZ Player 1.97 / Rapture Demo 1.0.

    // TODO: implement hold stage correctly

    void EGADSR::update(event_t Event, uint SampleRate) {
        if (atEnd(Event)) return;

        switch (Stage) {
            case stage_attack:
                switch (Event) {
                    case event_release:
                        enterReleaseStage();
                        break;
                    case event_stage_end:
                        if (HoldAttack)
                            enterAttackHoldStage();
                        else
                            enterDecayStage(SampleRate);
                        break;
                }
                break;
            case stage_attack_hold:
                switch (Event) {
                    case event_stage_end:
                        enterDecayStage(SampleRate);
                        break;
                    case event_release:
                        enterReleaseStage();
                        break;
                }
                break;
            case stage_decay:
                switch (Event) {
                    case event_release:
                        enterReleaseStage();
                        break;
                    case event_stage_end:
                        if (Level < CONFIG_EG_BOTTOM)
                            enterEndStage();
                        else
                            enterSustainStage();
                        break;
                }
                break;
            case stage_sustain:
                switch (Event) {
                    case event_stage_end: { // just refresh time
                        const int intMax = (unsigned int) -1 >> 1;
                        StepsLeft = intMax; // we use the highest possible value
                        break;
                    }
                    case event_release:
                        enterReleaseStage();
                        break;
                }
                break;
            case stage_release:
                switch (Event) {
                    case event_stage_end:
                        enterFadeOutStage();
                        break;
                    case event_cancel_release:
                        enterSustainStage();
                        break;
                }
                break;
        }
    }

    // TODO: HoldAttack should be HoldTime and float

    void EGADSR::trigger(uint PreAttack, float AttackTime, bool HoldAttack, float DecayTime, uint SustainLevel, float ReleaseTime, uint SampleRate) {
        this->SustainLevel = SustainLevel / 1000.0;
        this->HoldAttack   = HoldAttack;
        this->DecayTime    = DecayTime;

        if (ReleaseTime < CONFIG_EG_MIN_RELEASE_TIME) ReleaseTime = CONFIG_EG_MIN_RELEASE_TIME;  // to avoid click sounds at the end of the sample playback
        ReleaseSlope = -9.226 / (ReleaseTime * SampleRate);
        Offset = 0;
        enterFirstStage();
        enterAttackStage(PreAttack, AttackTime, SampleRate);
    }

    void EGADSR::enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate) {
        Stage   = stage_attack;
        Segment = segment_lin;

        if (AttackTime >= 0.0005f) {
            StepsLeft = int(AttackTime * SampleRate);
            Level = (float) PreAttack / 1000.0;
            Coeff = (1.0f - Level) / StepsLeft;
        } else { // attack is zero - immediately jump to the next stage
            Level = 1.0f;
            if (HoldAttack) enterAttackHoldStage();
            else            enterDecayStage(SampleRate);
        }
    }

    void EGADSR::enterAttackHoldStage() {
        Stage     = stage_attack_hold;
        Segment   = segment_lin;
        Coeff     = 0.0f; // don't rise anymore
        const int intMax = (unsigned int) -1 >> 1;
        StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
    }

    void EGADSR::enterDecayStage(const uint SampleRate) {
        StepsLeft = (int) (DecayTime * SampleRate);
        if (StepsLeft && Level > SustainLevel) {
            Stage   = stage_decay;
            Segment = segment_exp;
            const float slope = -9.226 / StepsLeft;
            Coeff  = exp(slope);
            StepsLeft = int(log(SustainLevel / Level) / slope);
            if (StepsLeft > 0) return;

            enterSustainStage();
        } else {
            enterSustainStage();
        }
    }

    void EGADSR::enterSustainStage() {
        Stage   = stage_sustain;
        Segment = segment_lin;
        Coeff   = 0.0f; // don't change the envelope level in this stage
        const int intMax = (unsigned int) -1 >> 1;
        StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
    }

    void EGADSR::enterReleaseStage() {
        Stage     = stage_release;
        Segment   = segment_exp;
        StepsLeft = int(log(CONFIG_EG_BOTTOM / Level) / ReleaseSlope);
        Coeff     = exp(ReleaseSlope);
        if (StepsLeft <= 0) enterFadeOutStage();
    }

}} // namespace LinuxSampler::sfz
1	persson	2055	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6			* Copyright (C) 2005 - 2010 Christian Schoenebeck *
7			* *
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., 51 Franklin St, Fifth Floor, Boston, *
21			* MA 02110-1301 USA *
22			***************************************************************************/
23
24			#include "EGADSR.h"
25
26			#include "../../common/global_private.h"
27
28			namespace LinuxSampler { namespace sfz {
29
30			// Modeled after output from SFZ Player 1.97 / Rapture Demo 1.0.
31
32			// TODO: implement hold stage correctly
33
34			void EGADSR::update(event_t Event, uint SampleRate) {
35			if (atEnd(Event)) return;
36
37			switch (Stage) {
38			case stage_attack:
39			switch (Event) {
40			case event_release:
41			enterReleaseStage();
42			break;
43			case event_stage_end:
44			if (HoldAttack)
45			enterAttackHoldStage();
46			else
47			enterDecayStage(SampleRate);
48			break;
49			}
50			break;
51			case stage_attack_hold:
52			switch (Event) {
53			case event_stage_end:
54			enterDecayStage(SampleRate);
55			break;
56			case event_release:
57			enterReleaseStage();
58			break;
59			}
60			break;
61			case stage_decay:
62			switch (Event) {
63			case event_release:
64			enterReleaseStage();
65			break;
66			case event_stage_end:
67			if (Level < CONFIG_EG_BOTTOM)
68			enterEndStage();
69			else
70			enterSustainStage();
71			break;
72			}
73			break;
74			case stage_sustain:
75			switch (Event) {
76			case event_stage_end: { // just refresh time
77			const int intMax = (unsigned int) -1 >> 1;
78			StepsLeft = intMax; // we use the highest possible value
79			break;
80			}
81			case event_release:
82			enterReleaseStage();
83			break;
84			}
85			break;
86			case stage_release:
87			switch (Event) {
88			case event_stage_end:
89			enterFadeOutStage();
90			break;
91			case event_cancel_release:
92			enterSustainStage();
93			break;
94			}
95			break;
96			}
97			}
98
99			// TODO: HoldAttack should be HoldTime and float
100
101			void EGADSR::trigger(uint PreAttack, float AttackTime, bool HoldAttack, float DecayTime, uint SustainLevel, float ReleaseTime, uint SampleRate) {
102			this->SustainLevel = SustainLevel / 1000.0;
103			this->HoldAttack = HoldAttack;
104			this->DecayTime = DecayTime;
105
106			if (ReleaseTime < CONFIG_EG_MIN_RELEASE_TIME) ReleaseTime = CONFIG_EG_MIN_RELEASE_TIME; // to avoid click sounds at the end of the sample playback
107			ReleaseSlope = -9.226 / (ReleaseTime * SampleRate);
108			Offset = 0;
109			enterFirstStage();
110			enterAttackStage(PreAttack, AttackTime, SampleRate);
111			}
112
113			void EGADSR::enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate) {
114			Stage = stage_attack;
115			Segment = segment_lin;
116
117			if (AttackTime >= 0.0005f) {
118			StepsLeft = int(AttackTime * SampleRate);
119			Level = (float) PreAttack / 1000.0;
120			Coeff = (1.0f - Level) / StepsLeft;
121			} else { // attack is zero - immediately jump to the next stage
122			Level = 1.0f;
123			if (HoldAttack) enterAttackHoldStage();
124			else enterDecayStage(SampleRate);
125			}
126			}
127
128			void EGADSR::enterAttackHoldStage() {
129			Stage = stage_attack_hold;
130			Segment = segment_lin;
131			Coeff = 0.0f; // don't rise anymore
132			const int intMax = (unsigned int) -1 >> 1;
133			StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
134			}
135
136			void EGADSR::enterDecayStage(const uint SampleRate) {
137			StepsLeft = (int) (DecayTime * SampleRate);
138			if (StepsLeft && Level > SustainLevel) {
139			Stage = stage_decay;
140			Segment = segment_exp;
141			const float slope = -9.226 / StepsLeft;
142			Coeff = exp(slope);
143			StepsLeft = int(log(SustainLevel / Level) / slope);
144			if (StepsLeft > 0) return;
145
146			enterSustainStage();
147			} else {
148			enterSustainStage();
149			}
150			}
151
152			void EGADSR::enterSustainStage() {
153			Stage = stage_sustain;
154			Segment = segment_lin;
155			Coeff = 0.0f; // don't change the envelope level in this stage
156			const int intMax = (unsigned int) -1 >> 1;
157			StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
158			}
159
160			void EGADSR::enterReleaseStage() {
161			Stage = stage_release;
162			Segment = segment_exp;
163			StepsLeft = int(log(CONFIG_EG_BOTTOM / Level) / ReleaseSlope);
164			Coeff = exp(ReleaseSlope);
165			if (StepsLeft <= 0) enterFadeOutStage();
166			}
167
168			}} // namespace LinuxSampler::sfz