Differential D2716 Diff 9153 extern/audaspace/include/fx/ADSRReader.h

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extern/audaspace/include/fx/ADSRReader.h

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				/*******************************************************************************
				* Copyright 2009-2016 Jörg Müller
				*
				* Licensed under the Apache License, Version 2.0 (the "License");
				* you may not use this file except in compliance with the License.
				* You may obtain a copy of the License at
				*
				* http://www.apache.org/licenses/LICENSE-2.0
				*
				* Unless required by applicable law or agreed to in writing, software
				* distributed under the License is distributed on an "AS IS" BASIS,
				* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
				* See the License for the specific language governing permissions and
				* limitations under the License.
				******************************************************************************/

				#pragma once

				/**
				* @file ADSRReader.h
				* @ingroup fx
				* The ADSRReader class.
				*/

				#include "fx/EffectReader.h"

				AUD_NAMESPACE_BEGIN

				/**
				* This class is an ADSR filters.
				*/
				class AUD_API ADSRReader : public EffectReader
				{
				private:
				enum ADSRState
				{
				ADSR_STATE_INVALID = 0, /// Invalid ADSR state or finished.
				ADSR_STATE_ATTACK = 1, /// Initial attack state.
				ADSR_STATE_DECAY = 2, /// Decay state.
				ADSR_STATE_SUSTAIN = 3, /// Sustain state.
				ADSR_STATE_RELEASE = 4 /// Release state.
				};

				/**
				* Attack time.
				*/
				float m_attack;

				/**
				* Decay time.
				*/
				float m_decay;

				/**
				* Sustain level.
				*/
				float m_sustain;

				/**
				* Release time.
				*/
				float m_release;

				/**
				* Current state.
				*/
				ADSRState m_state;

				/**
				* Current level.
				*/
				float m_level;

				// delete copy constructor and operator=
				ADSRReader(const ADSRReader&) = delete;
				ADSRReader& operator=(const ADSRReader&) = delete;

				void AUD_LOCAL nextState(ADSRState state);

				public:
				/**
				* Creates a new ADSR reader.
				* \param reader The reader to read from.
				* \param attack The attack time in seconds.
				* \param decay The decay time in seconds.
				* \param sustain The sustain level, should be in range [0 - 1].
				* \param release The release time in seconds.
				*/
				ADSRReader(std::shared_ptr<IReader> reader, float attack, float decay, float sustain, float release);

				virtual ~ADSRReader();

				virtual void read(int& length, bool& eos, sample_t* buffer);

				/**
				* Triggers the release.
				*/
				void release();
				};

				AUD_NAMESPACE_END