92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
/*******************************************************************************
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* Copyright 2009-2016 Jörg Müller
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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******************************************************************************/
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#include "fx/LoopReader.h"
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#include <cstring>
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AUD_NAMESPACE_BEGIN
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LoopReader::LoopReader(std::shared_ptr<IReader> reader, int loop) :
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EffectReader(reader), m_count(loop), m_left(loop)
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{
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}
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void LoopReader::seek(int position)
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{
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int len = m_reader->getLength();
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if(len < 0)
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m_reader->seek(position);
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else
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{
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if(m_count >= 0)
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{
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m_left = m_count - (position / len);
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if(m_left < 0)
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m_left = 0;
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}
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m_reader->seek(position % len);
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}
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}
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int LoopReader::getLength() const
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{
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if(m_count < 0)
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return -1;
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return m_reader->getLength() * m_count;
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}
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int LoopReader::getPosition() const
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{
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return m_reader->getPosition() * (m_count < 0 ? 1 : m_count);
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}
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void LoopReader::read(int& length, bool& eos, sample_t* buffer)
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{
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const Specs specs = m_reader->getSpecs();
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int len = length;
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m_reader->read(length, eos, buffer);
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if(length < len && eos && m_left)
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{
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int pos = length;
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length = len;
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while(pos < length && eos && m_left)
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{
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if(m_left > 0)
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m_left--;
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m_reader->seek(0);
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len = length - pos;
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m_reader->read(len, eos, buffer + pos * specs.channels);
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// prevent endless loop
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if(!len)
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break;
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pos += len;
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}
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length = pos;
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}
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}
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AUD_NAMESPACE_END
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