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author | Arystanbek Dyussenov <arystan.d@gmail.com> | 2010-09-04 22:49:07 +0400 |
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committer | Arystanbek Dyussenov <arystan.d@gmail.com> | 2010-09-04 22:49:07 +0400 |
commit | 90b464d3728d9ed8ec26fdf59058d236b99dbcd9 (patch) | |
tree | e88cab4fb1358e962b19f658064ca8c9f8d29f5b /intern/audaspace/FX/AUD_IIRFilterReader.cpp | |
parent | 08d02dd04d836976b25793bb1d4c6a86b3f924c7 (diff) | |
parent | b0b787ef38f9947b3176642556f5282eb3518f69 (diff) |
COLLADA branch: merge from trunk -r 28015:31610.soc-2009-chingachgook
Diffstat (limited to 'intern/audaspace/FX/AUD_IIRFilterReader.cpp')
-rw-r--r-- | intern/audaspace/FX/AUD_IIRFilterReader.cpp | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/intern/audaspace/FX/AUD_IIRFilterReader.cpp b/intern/audaspace/FX/AUD_IIRFilterReader.cpp new file mode 100644 index 00000000000..120c9f8d0ae --- /dev/null +++ b/intern/audaspace/FX/AUD_IIRFilterReader.cpp @@ -0,0 +1,50 @@ +/* + * $Id$ + * + * ***** 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_IIRFilterReader.h" + +AUD_IIRFilterReader::AUD_IIRFilterReader(AUD_IReader* reader, + std::vector<float> b, + std::vector<float> a) : + AUD_BaseIIRFilterReader(reader, b.size(), a.size()), m_a(a), m_b(b) +{ + for(int i = 1; i < m_a.size(); i++) + m_a[i] /= m_a[0]; + for(int i = 0; i < m_b.size(); i++) + m_b[i] /= m_a[0]; + m_a[0] = 1; +} + +sample_t AUD_IIRFilterReader::filter() +{ + sample_t out = 0; + + for(int i = 1; i < m_a.size(); i++) + out -= y(-i) * m_a[i]; + for(int i = 0; i < m_b.size(); i++) + out += x(-i) * m_b[i]; + + return out; +} |