forked from bartvdbraak/blender
106 lines
2.5 KiB
C++
106 lines
2.5 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_ReverseReader.cpp
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* \ingroup audfx
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*/
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#include "AUD_ReverseReader.h"
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#include <cstring>
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static const char* props_error = "AUD_ReverseReader: The reader has to be "
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"seekable and a finite length.";
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AUD_ReverseReader::AUD_ReverseReader(boost::shared_ptr<AUD_IReader> reader) :
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AUD_EffectReader(reader),
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m_length(reader->getLength()),
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m_position(0)
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{
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if(m_length < 0 || !reader->isSeekable())
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AUD_THROW(AUD_ERROR_PROPS, props_error);
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}
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void AUD_ReverseReader::seek(int position)
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{
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m_position = position;
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}
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int AUD_ReverseReader::getLength() const
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{
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return m_length;
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}
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int AUD_ReverseReader::getPosition() const
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{
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return m_position;
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}
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void AUD_ReverseReader::read(int& length, bool& eos, sample_t* buffer)
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{
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// first correct the length
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if(m_position + length > m_length)
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length = m_length - m_position;
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if(length <= 0)
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{
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length = 0;
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eos = true;
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return;
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}
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const AUD_Specs specs = getSpecs();
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const int samplesize = AUD_SAMPLE_SIZE(specs);
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sample_t temp[AUD_CHANNEL_MAX];
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int len = length;
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// read from reader
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m_reader->seek(m_length - m_position - len);
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m_reader->read(len, eos, buffer);
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// set null if reader didn't give enough data
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if(len < length)
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memset(buffer, 0, (length - len) * samplesize);
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// copy the samples reverted
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for(int i = 0; i < length / 2; i++)
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{
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memcpy(temp,
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buffer + (len - 1 - i) * specs.channels,
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samplesize);
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memcpy(buffer + (len - 1 - i) * specs.channels,
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buffer + i * specs.channels,
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samplesize);
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memcpy(buffer + i * specs.channels,
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temp,
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samplesize);
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}
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m_position += length;
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eos = false;
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}
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