96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
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/*******************************************************************************
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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 "sequence/SuperposeReader.h"
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#include "Exception.h"
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#include <algorithm>
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#include <cstring>
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AUD_NAMESPACE_BEGIN
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SuperposeReader::SuperposeReader(std::shared_ptr<IReader> reader1, std::shared_ptr<IReader> reader2) :
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m_reader1(reader1), m_reader2(reader2)
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{
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}
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SuperposeReader::~SuperposeReader()
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{
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}
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bool SuperposeReader::isSeekable() const
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{
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return m_reader1->isSeekable() && m_reader2->isSeekable();
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}
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void SuperposeReader::seek(int position)
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{
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m_reader1->seek(position);
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m_reader2->seek(position);
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}
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int SuperposeReader::getLength() const
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{
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int len1 = m_reader1->getLength();
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int len2 = m_reader2->getLength();
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if((len1 < 0) || (len2 < 0))
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return -1;
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return std::min(len1, len2);
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}
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int SuperposeReader::getPosition() const
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{
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int pos1 = m_reader1->getPosition();
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int pos2 = m_reader2->getPosition();
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return std::max(pos1, pos2);
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}
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Specs SuperposeReader::getSpecs() const
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{
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return m_reader1->getSpecs();
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}
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void SuperposeReader::read(int& length, bool& eos, sample_t* buffer)
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{
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Specs specs = m_reader1->getSpecs();
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Specs s2 = m_reader2->getSpecs();
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if(!AUD_COMPARE_SPECS(specs, s2))
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AUD_THROW(StateException, "Two readers with different specifiactions cannot be superposed.");
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int samplesize = AUD_SAMPLE_SIZE(specs);
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m_buffer.assureSize(length * samplesize);
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int len1 = length;
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m_reader1->read(len1, eos, buffer);
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if(len1 < length)
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std::memset(buffer + len1 * specs.channels, 0, (length - len1) * samplesize);
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int len2 = length;
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bool eos2;
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sample_t* buf = m_buffer.getBuffer();
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m_reader2->read(len2, eos2, buf);
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for(int i = 0; i < len2 * specs.channels; i++)
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buffer[i] += buf[i];
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length = std::max(len1, len2);
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eos &= eos2;
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}
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AUD_NAMESPACE_END
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