148 lines
3.3 KiB
C++
148 lines
3.3 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_LimiterReader.cpp
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* \ingroup audfx
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*/
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#include "AUD_LimiterReader.h"
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#include "AUD_Buffer.h"
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AUD_LimiterReader::AUD_LimiterReader(boost::shared_ptr<AUD_IReader> reader,
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float start, float end) :
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AUD_EffectReader(reader),
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m_start(start),
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m_end(end)
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{
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if(m_start > 0)
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{
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AUD_Specs specs = m_reader->getSpecs();
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AUD_Specs specs2;
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if(m_reader->isSeekable())
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m_reader->seek(m_start * specs.rate);
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else
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{
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// skip first m_start samples by reading them
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int length = AUD_DEFAULT_BUFFER_SIZE;
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AUD_Buffer buffer(AUD_DEFAULT_BUFFER_SIZE * AUD_SAMPLE_SIZE(specs));
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bool eos = false;
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for(int len = m_start * specs.rate;
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length > 0 && !eos;
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len -= length)
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{
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if(len < AUD_DEFAULT_BUFFER_SIZE)
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length = len;
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m_reader->read(length, eos, buffer.getBuffer());
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specs2 = m_reader->getSpecs();
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if(specs2.rate != specs.rate)
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{
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len = len * specs2.rate / specs.rate;
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specs.rate = specs2.rate;
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}
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if(specs2.channels != specs.channels)
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{
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specs = specs2;
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buffer.assureSize(AUD_DEFAULT_BUFFER_SIZE * AUD_SAMPLE_SIZE(specs));
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}
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}
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}
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}
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}
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void AUD_LimiterReader::seek(int position)
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{
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m_reader->seek(position + m_start * m_reader->getSpecs().rate);
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}
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int AUD_LimiterReader::getLength() const
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{
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int len = m_reader->getLength();
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AUD_SampleRate rate = m_reader->getSpecs().rate;
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if(len < 0 || (len > m_end * rate && m_end >= 0))
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len = m_end * rate;
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return len - m_start * rate;
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}
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int AUD_LimiterReader::getPosition() const
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{
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int pos = m_reader->getPosition();
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AUD_SampleRate rate = m_reader->getSpecs().rate;
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return AUD_MIN(pos, m_end * rate) - m_start * rate;
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}
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void AUD_LimiterReader::read(int& length, bool& eos, sample_t* buffer)
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{
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eos = false;
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if(m_end >= 0)
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{
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int position = m_reader->getPosition();
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AUD_SampleRate rate = m_reader->getSpecs().rate;
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if(position + length > m_end * rate)
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{
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length = m_end * rate - position;
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eos = true;
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}
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if(position < m_start * rate)
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{
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int len2 = length;
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for(int len = m_start * rate - position;
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len2 == length && !eos;
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len -= length)
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{
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if(len < length)
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len2 = len;
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m_reader->read(len2, eos, buffer);
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position += len2;
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}
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if(position < m_start * rate)
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{
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length = 0;
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return;
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}
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}
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if(length < 0)
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{
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length = 0;
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return;
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}
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}
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if(eos)
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{
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m_reader->read(length, eos, buffer);
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eos = true;
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}
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else
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m_reader->read(length, eos, buffer);
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}
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