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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2010 Andreas Persson * |
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* * |
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* 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 * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, * |
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* MA 02110-1301 USA * |
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***************************************************************************/ |
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#include "EG.h" |
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#include "../../common/global_private.h" |
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namespace LinuxSampler { namespace sfz { |
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// Modeled after output from Rapture Demo 1.0, which means the |
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// stages are using a pow function and the "curve" parameter of |
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// the stage is ignored. The "shape" parameter decides the slope |
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// of the stage, a value of 1.0 or 0.0 means linear shape. The |
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// length of the stages are dependent on the velocity. |
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// TODO: add support for loops |
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// TODO: optimization: use segment_lin for linear stages |
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void EG::update(event_t Event, uint SampleRate) { |
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if (atEnd(Event)) return; |
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if (Event == event_stage_end || Event == event_release) { |
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if (Stage == eg->node.size() - 1) { |
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enterFadeOutStage(); |
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} else if (Stage == eg->sustain && Stage != 0 && |
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Event != event_release) { |
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enterSustainStage(); |
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} else { |
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if (Event == event_release) { |
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Stage = eg->sustain; |
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} else { |
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Level = eg->node[Stage].level; |
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} |
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Stage++; |
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float shape = eg->node[Stage].shape; |
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if (shape < 0.000001) shape = 1; |
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float xd = eg->node[Stage].time * SampleRate * TimeCoeff; |
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float yd = eg->node[Stage].level - Level; |
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if (eg->node[Stage - 1].shape > 0.999999 || |
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eg->node[Stage - 1].shape < 0.000001) { |
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Exp = 1 / shape; |
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Offset = Level; |
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X = 0; |
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XDelta = 1 / xd; |
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Coeff = yd; |
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} else { |
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Exp = shape; |
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Offset = eg->node[Stage].level; |
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X = 1; |
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XDelta = -1 / xd; |
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Coeff = -yd; |
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} |
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Segment = segment_pow; |
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StepsLeft = int(xd); |
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} |
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} |
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} |
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void EG::trigger(::sfz::EG& eg, uint SampleRate, uint8_t Velocity) { |
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Stage = 0; |
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this->eg = ⪚ |
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TimeCoeff = exp(0.0054578518 * Velocity); // pow(2, Velcocity / 127) |
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enterFirstStage(); |
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update(event_stage_end, SampleRate); |
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} |
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void EG::enterSustainStage() { |
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Segment = segment_lin; |
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Coeff = 0.0f; // don't change the envelope level in this stage |
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const int intMax = (unsigned int) -1 >> 1; |
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StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case) |
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Level = eg->node[Stage].level; |
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} |
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}} // namespace LinuxSampler::sfz |