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/*******************************************************************************
* Copyright 2009-2016 Jörg Müller
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#include "fx/DelayReader.h"
#include <cstring>
AUD_NAMESPACE_BEGIN
DelayReader::DelayReader(std::shared_ptr<IReader> reader, float delay) :
EffectReader(reader),
m_delay(int((SampleRate)delay * reader->getSpecs().rate)),
m_remdelay(int((SampleRate)delay * reader->getSpecs().rate))
{
}
void DelayReader::seek(int position)
{
if(position < m_delay)
{
m_remdelay = m_delay - position;
m_reader->seek(0);
}
else
{
m_remdelay = 0;
m_reader->seek(position - m_delay);
}
}
int DelayReader::getLength() const
{
int len = m_reader->getLength();
if(len < 0)
return len;
return len + m_delay;
}
int DelayReader::getPosition() const
{
if(m_remdelay > 0)
return m_delay - m_remdelay;
return m_reader->getPosition() + m_delay;
}
void DelayReader::read(int& length, bool& eos, sample_t* buffer)
{
if(m_remdelay > 0)
{
Specs specs = m_reader->getSpecs();
int samplesize = AUD_SAMPLE_SIZE(specs);
if(length > m_remdelay)
{
std::memset(buffer, 0, m_remdelay * samplesize);
int len = length - m_remdelay;
m_reader->read(len, eos, buffer + m_remdelay * specs.channels);
length = m_remdelay + len;
m_remdelay = 0;
}
else
{
std::memset(buffer, 0, length * samplesize);
m_remdelay -= length;
}
}
else
m_reader->read(length, eos, buffer);
}
AUD_NAMESPACE_END
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