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extern/audaspace/src/fx/LoopReader.cpp
- This file was added.
| /******************************************************************************* | |||||
| * 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/LoopReader.h" | |||||
| #include <cstring> | |||||
| AUD_NAMESPACE_BEGIN | |||||
| LoopReader::LoopReader(std::shared_ptr<IReader> reader, int loop) : | |||||
| EffectReader(reader), m_count(loop), m_left(loop) | |||||
| { | |||||
| } | |||||
| void LoopReader::seek(int position) | |||||
| { | |||||
| int len = m_reader->getLength(); | |||||
| if(len < 0) | |||||
| m_reader->seek(position); | |||||
| else | |||||
| { | |||||
| if(m_count >= 0) | |||||
| { | |||||
| m_left = m_count - (position / len); | |||||
| if(m_left < 0) | |||||
| m_left = 0; | |||||
| } | |||||
| m_reader->seek(position % len); | |||||
| } | |||||
| } | |||||
| int LoopReader::getLength() const | |||||
| { | |||||
| if(m_count < 0) | |||||
| return -1; | |||||
| return m_reader->getLength() * m_count; | |||||
| } | |||||
| int LoopReader::getPosition() const | |||||
| { | |||||
| return m_reader->getPosition() * (m_count < 0 ? 1 : m_count); | |||||
| } | |||||
| void LoopReader::read(int& length, bool& eos, sample_t* buffer) | |||||
| { | |||||
| const Specs specs = m_reader->getSpecs(); | |||||
| int len = length; | |||||
| m_reader->read(length, eos, buffer); | |||||
| if(length < len && eos && m_left) | |||||
| { | |||||
| int pos = length; | |||||
| length = len; | |||||
| while(pos < length && eos && m_left) | |||||
| { | |||||
| if(m_left > 0) | |||||
| m_left--; | |||||
| m_reader->seek(0); | |||||
| len = length - pos; | |||||
| m_reader->read(len, eos, buffer + pos * specs.channels); | |||||
| // prevent endless loop | |||||
| if(!len) | |||||
| break; | |||||
| pos += len; | |||||
| } | |||||
| length = pos; | |||||
| } | |||||
| } | |||||
| AUD_NAMESPACE_END | |||||