diff options
Diffstat (limited to 'intern/audaspace/FX/AUD_ButterworthReader.cpp')
| -rw-r--r-- | intern/audaspace/FX/AUD_ButterworthReader.cpp | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/intern/audaspace/FX/AUD_ButterworthReader.cpp b/intern/audaspace/FX/AUD_ButterworthReader.cpp deleted file mode 100644 index 2129dfef798..00000000000 --- a/intern/audaspace/FX/AUD_ButterworthReader.cpp +++ /dev/null @@ -1,124 +0,0 @@ -/* - * $Id$ - * - * ***** 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_ButterworthReader.h" -#include "AUD_Buffer.h" - -#include <cstring> -#include <cmath> - -#ifndef M_PI -#define M_PI 3.14159265358979323846 -#endif - -#define BWPB41 0.76536686473 -#define BWPB42 1.84775906502 -#define CC channels + channel - -AUD_ButterworthReader::AUD_ButterworthReader(AUD_IReader* reader, - float frequency) : - AUD_EffectReader(reader) -{ - AUD_Specs specs = reader->getSpecs(); - int samplesize = AUD_SAMPLE_SIZE(specs); - - m_buffer = new AUD_Buffer(); AUD_NEW("buffer") - - m_outvalues = new AUD_Buffer(samplesize * 5); AUD_NEW("buffer") - memset(m_outvalues->getBuffer(), 0, samplesize * 5); - - m_invalues = new AUD_Buffer(samplesize * 5); AUD_NEW("buffer") - memset(m_invalues->getBuffer(), 0, samplesize * 5); - - m_position = 0; - - // calculate coefficients - float omega = 2 * tan(frequency * M_PI / specs.rate); - float o2 = omega * omega; - float o4 = o2 * o2; - float x1 = o2 + 2 * BWPB41 * omega + 4; - float x2 = o2 + 2 * BWPB42 * omega + 4; - float y1 = o2 - 2 * BWPB41 * omega + 4; - float y2 = o2 - 2 * BWPB42 * omega + 4; - float o228 = 2 * o2 - 8; - float norm = x1 * x2; - m_coeff[0][0] = 0; - m_coeff[0][1] = (x1 + x2) * o228 / norm; - m_coeff[0][2] = (x1 * y2 + x2 * y1 + o228 * o228) / norm; - m_coeff[0][3] = (y1 + y2) * o228 / norm; - m_coeff[0][4] = y1 * y2 / norm; - m_coeff[1][4] = m_coeff[1][0] = o4 / norm; - m_coeff[1][3] = m_coeff[1][1] = 4 * o4 / norm; - m_coeff[1][2] = 6 * o4 / norm; -} - -AUD_ButterworthReader::~AUD_ButterworthReader() -{ - delete m_buffer; AUD_DELETE("buffer") - - delete m_outvalues; AUD_DELETE("buffer") - delete m_invalues; AUD_DELETE("buffer"); -} - -void AUD_ButterworthReader::read(int & length, sample_t* & buffer) -{ - sample_t* buf; - sample_t* outvalues; - sample_t* invalues; - - outvalues = m_outvalues->getBuffer(); - invalues = m_invalues->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(); - int channels = specs.channels; - - for(int channel = 0; channel < channels; channel++) - { - for(int i = 0; i < length; i++) - { - invalues[m_position * CC] = buf[i * CC]; - outvalues[m_position * CC] = 0; - - for(int j = 0; j < 4; j++) - { - outvalues[m_position * CC] += m_coeff[1][j] * - invalues[((m_position + j) % 5) * CC] - - m_coeff[0][j] * - outvalues[((m_position + j) % 5) * CC]; - } - - buffer[i * CC] = outvalues[m_position * CC]; - - m_position = (m_position + 4) % 5; - } - } -} |