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* LinuxSampler - modular, streaming capable sampler * |
* LinuxSampler - modular, streaming capable sampler * |
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* * |
* * |
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* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
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* Copyright (C) 2005 Christian Schoenebeck * |
* Copyright (C) 2005 - 2010 Christian Schoenebeck * |
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* * |
* * |
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* This program is free software; you can redistribute it and/or modify * |
* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
* it under the terms of the GNU General Public License as published by * |
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#include "EGADSR.h" |
#include "EGADSR.h" |
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namespace LinuxSampler { namespace gig { |
#include "../../common/global_private.h" |
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EGADSR::EGADSR() { |
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enterEndStage(); |
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Level = 0.0; |
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CalculateFadeOutCoeff(CONFIG_EG_MIN_RELEASE_TIME, 44100.0); // even if the sample rate will be 192kHz it won't hurt at all |
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} |
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void EGADSR::CalculateFadeOutCoeff(float FadeOutTime, float SampleRate) { |
namespace LinuxSampler { namespace gig { |
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const float killSteps = FadeOutTime * SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE; |
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FadeOutCoeff = -1.0f / killSteps; |
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} |
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void EGADSR::update(event_t Event, uint SampleRate) { |
void EGADSR::update(event_t Event, uint SampleRate) { |
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if (atEnd(Event)) return; |
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if (Event == event_hold_end) HoldAttack = false; |
if (Event == event_hold_end) HoldAttack = false; |
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switch (Stage) { |
switch (Stage) { |
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case event_release: |
case event_release: |
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enterReleasePart1Stage(); |
enterReleasePart1Stage(); |
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break; |
break; |
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case event_cancel_release: |
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enterSustainStage(); |
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break; |
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case event_stage_end: |
case event_stage_end: |
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if (HoldAttack) |
if (HoldAttack) |
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enterAttackHoldStage(); |
enterAttackHoldStage(); |
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case event_release: |
case event_release: |
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enterReleasePart1Stage(); |
enterReleasePart1Stage(); |
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break; |
break; |
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case event_cancel_release: |
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if (InfiniteSustain) |
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enterSustainStage(); |
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else |
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enterDecay1Part1Stage(SampleRate); |
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break; |
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} |
} |
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break; |
break; |
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case stage_decay1_part1: |
case stage_decay1_part1: |
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case event_release: |
case event_release: |
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enterReleasePart1Stage(); |
enterReleasePart1Stage(); |
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break; |
break; |
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case event_cancel_release: |
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if (InfiniteSustain) |
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enterSustainStage(); |
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else |
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enterDecay2Stage(SampleRate); |
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break; |
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} |
} |
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break; |
break; |
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case stage_decay1_part2: |
case stage_decay1_part2: |
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case event_release: |
case event_release: |
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enterReleasePart1Stage(); |
enterReleasePart1Stage(); |
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break; |
break; |
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case event_stage_end: // fall through |
case event_stage_end: |
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case event_cancel_release: |
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if (Level < CONFIG_EG_BOTTOM) |
if (Level < CONFIG_EG_BOTTOM) |
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enterEndStage(); |
enterEndStage(); |
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else if (InfiniteSustain) |
else if (InfiniteSustain) |
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break; |
break; |
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} |
} |
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break; |
break; |
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case stage_fadeout: |
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switch (Event) { |
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case event_stage_end: |
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enterEndStage(); |
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break; |
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} |
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break; |
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} |
} |
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} |
} |
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ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2); |
ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2); |
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ReleaseLevel2 = 0.25 * invVolume; |
ReleaseLevel2 = 0.25 * invVolume; |
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enterFirstStage(); |
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enterAttackStage(PreAttack, AttackTime, SampleRate); |
enterAttackStage(PreAttack, AttackTime, SampleRate); |
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} |
} |
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Decay1Slope = (1.347f * SustainLevel - 1.361f) / StepsLeft; |
Decay1Slope = (1.347f * SustainLevel - 1.361f) / StepsLeft; |
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Coeff = Decay1Slope * invVolume; |
Coeff = Decay1Slope * invVolume; |
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Decay1Level2 = 0.25 * invVolume; |
Decay1Level2 = 0.25 * invVolume; |
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if (Level < Decay1Level2) enterDecay1Part2Stage(SampleRate); |
StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff); |
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else StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff); |
if (StepsLeft <= 0) enterDecay1Part2Stage(SampleRate); |
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} else { |
} else { |
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if (InfiniteSustain) enterSustainStage(); |
if (InfiniteSustain) enterSustainStage(); |
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else enterDecay2Stage(SampleRate); |
else enterDecay2Stage(SampleRate); |
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Coeff = exp(Decay1Slope); |
Coeff = exp(Decay1Slope); |
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Offset = ExpOffset * (1 - Coeff); |
Offset = ExpOffset * (1 - Coeff); |
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StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope); |
StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope); |
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} else { |
if (StepsLeft > 0) return; |
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if (InfiniteSustain) enterSustainStage(); |
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else enterDecay2Stage(SampleRate); |
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} |
} |
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if (InfiniteSustain) enterSustainStage(); |
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else enterDecay2Stage(SampleRate); |
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} |
} |
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void EGADSR::enterDecay2Stage(const uint SampleRate) { |
void EGADSR::enterDecay2Stage(const uint SampleRate) { |
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Coeff = (-1.03 / StepsLeft) * invVolume; |
Coeff = (-1.03 / StepsLeft) * invVolume; |
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//FIXME: do we really have to calculate 'StepsLeft' two times? |
//FIXME: do we really have to calculate 'StepsLeft' two times? |
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StepsLeft = int((CONFIG_EG_BOTTOM - Level) / Coeff); |
StepsLeft = int((CONFIG_EG_BOTTOM - Level) / Coeff); |
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if (StepsLeft == 0) enterEndStage(); |
if (StepsLeft <= 0) enterEndStage(); |
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} |
} |
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void EGADSR::enterSustainStage() { |
void EGADSR::enterSustainStage() { |
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Segment = segment_lin; |
Segment = segment_lin; |
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StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff); |
StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff); |
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Coeff = ReleaseCoeff; |
Coeff = ReleaseCoeff; |
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if (StepsLeft == 0) enterReleasePart2Stage(); |
if (StepsLeft <= 0) enterReleasePart2Stage(); |
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} |
} |
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void EGADSR::enterReleasePart2Stage() { |
void EGADSR::enterReleasePart2Stage() { |
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StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope); |
StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope); |
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Coeff = ReleaseCoeff2; |
Coeff = ReleaseCoeff2; |
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Offset = ReleaseCoeff3; |
Offset = ReleaseCoeff3; |
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if (StepsLeft == 0) enterFadeOutStage(); |
if (StepsLeft <= 0) enterFadeOutStage(); |
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} |
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void EGADSR::enterFadeOutStage() { |
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Stage = stage_fadeout; |
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Segment = segment_lin; |
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StepsLeft = int(Level / (-FadeOutCoeff)); |
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Coeff = FadeOutCoeff; |
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if (StepsLeft == 0) enterEndStage(); |
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} |
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void EGADSR::enterEndStage() { |
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Stage = stage_end; |
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Segment = segment_end; |
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Level = 0; |
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} |
} |
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}} // namespace LinuxSampler::gig |
}} // namespace LinuxSampler::gig |