87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* Copyright 2009-2011 Jörg Hermann Müller
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*
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* This file is part of AudaSpace.
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*
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* Audaspace 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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* AudaSpace 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 Audaspace; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file audaspace/FX/AUD_FaderReader.cpp
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* \ingroup audfx
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*/
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#include "AUD_FaderReader.h"
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#include <cstring>
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AUD_FaderReader::AUD_FaderReader(boost::shared_ptr<AUD_IReader> reader, AUD_FadeType type,
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float start,float length) :
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AUD_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 AUD_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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AUD_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) / (float)specs.rate <= m_start)
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{
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if(m_type != AUD_FADE_OUT)
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{
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memset(buffer, 0, length * samplesize);
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}
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}
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else if(position / (float)specs.rate >= m_start+m_length)
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{
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if(m_type == AUD_FADE_OUT)
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{
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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 = (((position+i)/(float)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 == AUD_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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