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/*
* $Id$
*
* ***** BEGIN LGPL LICENSE BLOCK *****
*
* Copyright 2009 Jörg Hermann Müller
*
* This file is part of AudaSpace.
*
* AudaSpace is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* AudaSpace is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
*
* ***** END LGPL LICENSE BLOCK *****
*/
#include "AUD_FaderReader.h"
#include "AUD_Buffer.h"
#include <cstring>
AUD_FaderReader::AUD_FaderReader(AUD_IReader* reader, AUD_FadeType type,
float start,float length) :
AUD_EffectReader(reader),
m_type(type),
m_start(start),
m_length(length)
{
int bigendian = 1;
bigendian = (((char*)&bigendian)[0]) ? 0: 1; // 1 if Big Endian
switch(m_reader->getSpecs().format)
{
case AUD_FORMAT_S16:
m_adjust = AUD_volume_adjust<int16_t>;
break;
case AUD_FORMAT_S32:
m_adjust = AUD_volume_adjust<int32_t>;
break;
case AUD_FORMAT_FLOAT32:
m_adjust = AUD_volume_adjust<float>;
break;
case AUD_FORMAT_FLOAT64:
m_adjust = AUD_volume_adjust<double>;
break;
case AUD_FORMAT_U8:
m_adjust = AUD_volume_adjust_u8;
break;
case AUD_FORMAT_S24:
m_adjust = bigendian ? AUD_volume_adjust_s24_be :
AUD_volume_adjust_s24_le;
break;
default:
delete m_reader;
AUD_THROW(AUD_ERROR_READER);
}
m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
}
AUD_FaderReader::~AUD_FaderReader()
{
delete m_buffer; AUD_DELETE("buffer")
}
bool AUD_FaderReader::notify(AUD_Message &message)
{
return m_reader->notify(message);
}
void AUD_FaderReader::read(int & length, sample_t* & buffer)
{
int position = m_reader->getPosition();
AUD_Specs specs = m_reader->getSpecs();
int samplesize = AUD_SAMPLE_SIZE(specs);
m_reader->read(length, buffer);
if(m_buffer->getSize() < length * samplesize)
m_buffer->resize(length * samplesize);
if((position + length) / (float)specs.rate <= m_start)
{
if(m_type != AUD_FADE_OUT)
{
buffer = m_buffer->getBuffer();
memset(buffer,
specs.format == AUD_FORMAT_U8 ? 0x80 : 0,
length * samplesize);
}
}
else if(position / (float)specs.rate >= m_start+m_length)
{
if(m_type == AUD_FADE_OUT)
{
buffer = m_buffer->getBuffer();
memset(buffer,
specs.format == AUD_FORMAT_U8 ? 0x80 : 0,
length * samplesize);
}
}
else
{
sample_t* buf = m_buffer->getBuffer();
float volume;
for(int i = 0; i < length; i++)
{
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 == AUD_FADE_OUT)
volume = 1.0f - volume;
m_adjust(buf + i * samplesize, buffer + i * samplesize,
specs.channels, volume);
}
buffer = buf;
}
}
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