diff options
Diffstat (limited to 'extern/audaspace/src/fx/DelayReader.cpp')
-rw-r--r-- | extern/audaspace/src/fx/DelayReader.cpp | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/extern/audaspace/src/fx/DelayReader.cpp b/extern/audaspace/src/fx/DelayReader.cpp new file mode 100644 index 00000000000..530aed69cba --- /dev/null +++ b/extern/audaspace/src/fx/DelayReader.cpp @@ -0,0 +1,87 @@ +/******************************************************************************* + * 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 |