diff options
Diffstat (limited to 'libs/qm-dsp/dsp/signalconditioning/Framer.cpp')
-rw-r--r-- | libs/qm-dsp/dsp/signalconditioning/Framer.cpp | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/libs/qm-dsp/dsp/signalconditioning/Framer.cpp b/libs/qm-dsp/dsp/signalconditioning/Framer.cpp new file mode 100644 index 0000000000..e352278ada --- /dev/null +++ b/libs/qm-dsp/dsp/signalconditioning/Framer.cpp @@ -0,0 +1,109 @@ +/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ + +/* + QM DSP Library + + Centre for Digital Music, Queen Mary, University of London. + This file 2005-2006 Christian Landone. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. See the file + COPYING included with this distribution for more information. +*/ + +#include "Framer.h" +#include <math.h> + +////////////////////////////////////////////////////////////////////// +// Construction/Destruction +////////////////////////////////////////////////////////////////////// + +Framer::Framer() +{ + m_dataFrame = NULL; + m_strideFrame = NULL; +} + +Framer::~Framer() +{ + if( m_dataFrame != NULL ) + delete [] m_dataFrame; + + if( m_strideFrame != NULL ) + delete [] m_strideFrame; +} + +void Framer::configure( unsigned int frameLength, unsigned int hop ) +{ + m_frameLength = frameLength; + m_stepSize = hop; + + resetCounters(); + + if( m_dataFrame != NULL ) + { + delete [] m_dataFrame; + m_dataFrame = NULL; + } + m_dataFrame = new double[ m_frameLength ]; + + if( m_strideFrame != NULL ) + { + delete [] m_strideFrame; + m_strideFrame = NULL; + } + m_strideFrame = new double[ m_stepSize ]; +} + +void Framer::getFrame(double *dst) +{ + + if( (m_ulSrcIndex + ( m_frameLength) ) < m_ulSampleLen ) + { + for( unsigned int u = 0; u < m_frameLength; u++) + { + dst[ u ] = m_srcBuffer[ m_ulSrcIndex++ ]; + } + m_ulSrcIndex -= ( m_frameLength - m_stepSize ); + } + else + { + unsigned int rem = (m_ulSampleLen - m_ulSrcIndex ); + unsigned int zero = m_frameLength - rem; + + for( unsigned int u = 0; u < rem; u++ ) + { + dst[ u ] = m_srcBuffer[ m_ulSrcIndex++ ]; + } + + for( unsigned int u = 0; u < zero; u++ ) + { + dst[ rem + u ] = 0; + } + + m_ulSrcIndex -= (( rem - m_stepSize ) ); + } + + m_framesRead++; +} + +void Framer::resetCounters() +{ + m_framesRead = 0; + m_ulSrcIndex = 0; +} + +unsigned int Framer::getMaxNoFrames() +{ + return m_maxFrames; +} + +void Framer::setSource(double *src, unsigned int length) +{ + m_srcBuffer = src; + m_ulSampleLen = length; + + m_maxFrames = (unsigned int)ceil( (double)m_ulSampleLen/(double)m_stepSize ) ; +} |