diff options
Diffstat (limited to 'intern/audaspace/FX/AUD_AccumulatorReader.cpp')
-rw-r--r-- | intern/audaspace/FX/AUD_AccumulatorReader.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/intern/audaspace/FX/AUD_AccumulatorReader.cpp b/intern/audaspace/FX/AUD_AccumulatorReader.cpp new file mode 100644 index 00000000000..67ab4157f9c --- /dev/null +++ b/intern/audaspace/FX/AUD_AccumulatorReader.cpp @@ -0,0 +1,99 @@ +/* + * $Id$ + * + * ***** 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_AccumulatorReader.h" +#include "AUD_Buffer.h" + +#include <cstring> + +#define CC specs.channels + channel + +AUD_AccumulatorReader::AUD_AccumulatorReader(AUD_IReader* reader, + bool additive) : + AUD_EffectReader(reader), + m_additive(additive) +{ + AUD_Specs specs = reader->getSpecs(); + int samplesize = AUD_SAMPLE_SIZE(specs); + + m_buffer = new AUD_Buffer(); AUD_NEW("buffer") + + m_sums = new AUD_Buffer(samplesize); AUD_NEW("buffer") + memset(m_sums->getBuffer(), 0, samplesize); + + m_prevs = new AUD_Buffer(samplesize); AUD_NEW("buffer") + memset(m_prevs->getBuffer(), 0, samplesize); +} + +AUD_AccumulatorReader::~AUD_AccumulatorReader() +{ + delete m_buffer; AUD_DELETE("buffer") + delete m_sums; AUD_DELETE("buffer") + delete m_prevs; AUD_DELETE("buffer") +} + +void AUD_AccumulatorReader::read(int & length, sample_t* & buffer) +{ + sample_t* buf; + sample_t* sums; + sample_t* prevs; + sums = m_sums->getBuffer(); + prevs = m_prevs->getBuffer(); + + AUD_Specs specs = m_reader->getSpecs(); + + m_reader->read(length, buf); + if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs)) + m_buffer->resize(length * AUD_SAMPLE_SIZE(specs)); + + buffer = m_buffer->getBuffer(); + + if(m_additive) + { + for(int channel = 0; channel < specs.channels; channel++) + { + for(int i = 0; i < length; i++) + { + if(buf[i * CC] > prevs[channel]) + sums[channel] += buf[i * CC] - prevs[channel]; + buffer[i * CC] = sums[channel] + buf[i * CC]; + prevs[channel] = buf[i * CC]; + } + } + } + else + { + for(int channel = 0; channel < specs.channels; channel++) + { + for(int i = 0; i < length * specs.channels; i++) + { + if(buf[i * CC] > prevs[channel]) + sums[channel] += buf[i * CC] - prevs[channel]; + buffer[i * CC] = sums[channel]; + prevs[channel] = buf[i * CC]; + } + } + } +} |