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extern/audaspace/src/fx/FaderReader.cpp
- This file was added.
| /******************************************************************************* | |||||
| * Copyright 2009-2015 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. | |||||
| ******************************************************************************/ | |||||
| #include "fx/FaderReader.h" | |||||
| #include <cstring> | |||||
| AUD_NAMESPACE_BEGIN | |||||
| FaderReader::FaderReader(std::shared_ptr<IReader> reader, FadeType type, float start,float length) : | |||||
| EffectReader(reader), | |||||
| m_type(type), | |||||
| m_start(start), | |||||
| m_length(length) | |||||
| { | |||||
| } | |||||
| void FaderReader::read(int& length, bool& eos, sample_t* buffer) | |||||
| { | |||||
| int position = m_reader->getPosition(); | |||||
| Specs specs = m_reader->getSpecs(); | |||||
| int samplesize = AUD_SAMPLE_SIZE(specs); | |||||
| m_reader->read(length, eos, buffer); | |||||
| if((position + length) / (float)specs.rate <= m_start) | |||||
| { | |||||
| if(m_type != FADE_OUT) | |||||
| { | |||||
| std::memset(buffer, 0, length * samplesize); | |||||
| } | |||||
| } | |||||
| else if(position / (float)specs.rate >= m_start+m_length) | |||||
| { | |||||
| if(m_type == FADE_OUT) | |||||
| { | |||||
| std::memset(buffer, 0, length * samplesize); | |||||
| } | |||||
| } | |||||
| else | |||||
| { | |||||
| float volume = 1.0f; | |||||
| for(int i = 0; i < length * specs.channels; i++) | |||||
| { | |||||
| if(i % specs.channels == 0) | |||||
| { | |||||
| volume = (((position+i)/(float)specs.rate)-m_start) / m_length; | |||||
| if(volume > 1.0f) | |||||
| volume = 1.0f; | |||||
| else if(volume < 0.0f) | |||||
| volume = 0.0f; | |||||
| if(m_type == FADE_OUT) | |||||
| volume = 1.0f - volume; | |||||
| } | |||||
| buffer[i] = buffer[i] * volume; | |||||
| } | |||||
| } | |||||
| } | |||||
| AUD_NAMESPACE_END | |||||