diff options
Diffstat (limited to 'extern/audaspace/src/fx/LoopReader.cpp')
-rw-r--r-- | extern/audaspace/src/fx/LoopReader.cpp | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/extern/audaspace/src/fx/LoopReader.cpp b/extern/audaspace/src/fx/LoopReader.cpp new file mode 100644 index 00000000000..2f13a5880eb --- /dev/null +++ b/extern/audaspace/src/fx/LoopReader.cpp @@ -0,0 +1,91 @@ +/******************************************************************************* + * 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 |