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extern/audaspace/src/fx/DelayReader.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/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 | |||||