diff options
Diffstat (limited to 'intern/audaspace/FX/AUD_LimiterReader.cpp')
-rw-r--r-- | intern/audaspace/FX/AUD_LimiterReader.cpp | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/intern/audaspace/FX/AUD_LimiterReader.cpp b/intern/audaspace/FX/AUD_LimiterReader.cpp new file mode 100644 index 00000000000..05882369001 --- /dev/null +++ b/intern/audaspace/FX/AUD_LimiterReader.cpp @@ -0,0 +1,95 @@ +/* + * $Id$ + * + * ***** BEGIN LGPL LICENSE BLOCK ***** + * + * Copyright 2009 Jörg Hermann Müller + * + * This file is part of AudaSpace. + * + * AudaSpace is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * AudaSpace is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with AudaSpace. If not, see <http://www.gnu.org/licenses/>. + * + * ***** END LGPL LICENSE BLOCK ***** + */ + +#include "AUD_LimiterReader.h" +#include "AUD_Buffer.h" + +#include <iostream> + +AUD_LimiterReader::AUD_LimiterReader(AUD_IReader* reader, + float start, float end) : + AUD_EffectReader(reader) +{ + m_end = (int)(end * reader->getSpecs().rate); + + if(start <= 0) + m_start = 0; + else + { + m_start = (int)(start * reader->getSpecs().rate); + if(m_reader->isSeekable()) + m_reader->seek(m_start); + else + { + // skip first m_start samples by reading them + int length; + sample_t* buffer; + for(int i = m_start; + i >= AUD_DEFAULT_BUFFER_SIZE; + i -= AUD_DEFAULT_BUFFER_SIZE) + { + length = AUD_DEFAULT_BUFFER_SIZE; + m_reader->read(length, buffer); + length = i; + } + m_reader->read(length, buffer); + } + } +} + +void AUD_LimiterReader::seek(int position) +{ + m_reader->seek(position + m_start); +} + +int AUD_LimiterReader::getLength() +{ + int len = m_reader->getLength(); + if(m_reader->getType() != AUD_TYPE_BUFFER || len < 0 || + (len > m_end && m_end >= 0)) + len = m_end; + return len - m_start; +} + +int AUD_LimiterReader::getPosition() +{ + return m_reader->getPosition() - m_start; +} + +void AUD_LimiterReader::read(int & length, sample_t* & buffer) +{ + if(m_end >= 0) + { + int position = m_reader->getPosition(); + if(position+length > m_end) + length = m_end - position; + if(length < 0) + { + length = 0; + return; + } + } + m_reader->read(length, buffer); +} |