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Diffstat (limited to 'extern/audaspace/include/fx/ADSRReader.h')
-rw-r--r-- | extern/audaspace/include/fx/ADSRReader.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/extern/audaspace/include/fx/ADSRReader.h b/extern/audaspace/include/fx/ADSRReader.h new file mode 100644 index 00000000000..a9ec076a1c5 --- /dev/null +++ b/extern/audaspace/include/fx/ADSRReader.h @@ -0,0 +1,101 @@ +/******************************************************************************* + * 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 |