diff options
Diffstat (limited to 'intern/audaspace/FX/AUD_ReverseReader.cpp')
-rw-r--r-- | intern/audaspace/FX/AUD_ReverseReader.cpp | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/intern/audaspace/FX/AUD_ReverseReader.cpp b/intern/audaspace/FX/AUD_ReverseReader.cpp new file mode 100644 index 00000000000..043480b91b9 --- /dev/null +++ b/intern/audaspace/FX/AUD_ReverseReader.cpp @@ -0,0 +1,111 @@ +/* + * $Id$ + * + * ***** 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_ReverseReader.h" +#include "AUD_Buffer.h" + +#include <cstring> + +AUD_ReverseReader::AUD_ReverseReader(AUD_IReader* reader) : + AUD_EffectReader(reader) +{ + if(reader->getType() != AUD_TYPE_BUFFER) + AUD_THROW(AUD_ERROR_READER); + + m_length = reader->getLength(); + if(m_length < 0) + AUD_THROW(AUD_ERROR_READER); + + m_position = 0; + m_buffer = new AUD_Buffer(); AUD_NEW("buffer") +} + +AUD_ReverseReader::~AUD_ReverseReader() +{ + delete m_buffer; AUD_DELETE("buffer") +} + +void AUD_ReverseReader::seek(int position) +{ + m_position = position; +} + +int AUD_ReverseReader::getLength() +{ + return m_length; +} + +int AUD_ReverseReader::getPosition() +{ + return m_position; +} + +void AUD_ReverseReader::read(int & length, sample_t* & buffer) +{ + // first correct the length + if(m_position+length > m_length) + length = m_length-m_position; + + if(length <= 0) + { + length = 0; + return; + } + + int samplesize = AUD_SAMPLE_SIZE(getSpecs()); + + // resize buffer if needed + if(m_buffer->getSize() < length * samplesize) + m_buffer->resize(length * samplesize); + + buffer = m_buffer->getBuffer(); + + sample_t* buf; + int len = length; + + // read from reader + m_reader->seek(m_length-m_position-len); + m_reader->read(len, buf); + + // set null if reader didn't give enough data + if(len < length) + { + if(getSpecs().format == AUD_FORMAT_U8) + memset(buffer, 0x80, (length-len)*samplesize); + else + memset(buffer, 0, (length-len)*samplesize); + buffer += length-len; + } + + // copy the samples reverted + for(int i = 0; i < len; i++) + memcpy(buffer + i * samplesize, + buf + (len - 1 - i) * samplesize, + samplesize); + + m_position += length; + + buffer = m_buffer->getBuffer(); +} |