77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
/*******************************************************************************
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* Copyright 2009-2016 Jörg Müller
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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******************************************************************************/
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#include "fx/FaderReader.h"
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#include <cstring>
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AUD_NAMESPACE_BEGIN
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FaderReader::FaderReader(std::shared_ptr<IReader> reader, FadeType type, double start, double length) :
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EffectReader(reader),
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m_type(type),
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m_start(start),
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m_length(length)
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{
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}
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void FaderReader::read(int& length, bool& eos, sample_t* buffer)
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{
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int position = m_reader->getPosition();
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Specs specs = m_reader->getSpecs();
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int samplesize = AUD_SAMPLE_SIZE(specs);
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m_reader->read(length, eos, buffer);
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if((position + length) / specs.rate <= m_start)
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{
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if(m_type != FADE_OUT)
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{
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std::memset(buffer, 0, length * samplesize);
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}
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}
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else if(position / specs.rate >= m_start+m_length)
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{
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if(m_type == FADE_OUT)
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{
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std::memset(buffer, 0, length * samplesize);
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}
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}
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else
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{
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float volume = 1.0f;
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for(int i = 0; i < length * specs.channels; i++)
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{
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if(i % specs.channels == 0)
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{
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volume = float((((position + i) / specs.rate) - m_start) / m_length);
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if(volume > 1.0f)
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volume = 1.0f;
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else if(volume < 0.0f)
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volume = 0.0f;
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if(m_type == FADE_OUT)
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volume = 1.0f - volume;
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}
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buffer[i] = buffer[i] * volume;
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}
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}
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}
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AUD_NAMESPACE_END
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