Joerg Mueller
986267300b
Deleting the old internal audaspace. Major changes from there are: - The whole library was refactored to use C++11. - Many stability and performance improvements. - Major Python API refactor: - Most requested: Play self generated sounds using numpy arrays. - For games: Sound list, random sounds and dynamic music. - Writing sounds to files. - Sequencing API. - Opening sound devices, eg. Jack. - Ability to choose different OpenAL devices in the user settings.
89 lines
2.2 KiB
C++
89 lines
2.2 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/ReverseReader.h"
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#include "Exception.h"
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#include <cstring>
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AUD_NAMESPACE_BEGIN
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ReverseReader::ReverseReader(std::shared_ptr<IReader> reader) :
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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(StateException, "A reader has to be seekable and have finite length to be reversible.");
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}
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void ReverseReader::seek(int position)
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{
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m_position = position;
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}
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int ReverseReader::getLength() const
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{
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return m_length;
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}
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int ReverseReader::getPosition() const
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{
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return m_position;
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}
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void 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 Specs specs = getSpecs();
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const int samplesize = AUD_SAMPLE_SIZE(specs);
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sample_t temp[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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std::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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std::memcpy(temp, buffer + (len - 1 - i) * specs.channels, samplesize);
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std::memcpy(buffer + (len - 1 - i) * specs.channels, buffer + i * specs.channels, samplesize);
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std::memcpy(buffer + i * specs.channels, temp, 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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AUD_NAMESPACE_END
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