c@225: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
c@225: 
c@225: /*
c@225:     QM DSP Library
c@225: 
c@225:     Centre for Digital Music, Queen Mary, University of London.
c@309:     This file 2005-2006 Christian Landone.
c@309: 
c@309:     This program is free software; you can redistribute it and/or
c@309:     modify it under the terms of the GNU General Public License as
c@309:     published by the Free Software Foundation; either version 2 of the
c@309:     License, or (at your option) any later version.  See the file
c@309:     COPYING included with this distribution for more information.
c@225: */
c@225: 
c@225: #include "Framer.h"
cannam@485: #include <cmath>
cannam@485: #include <cstddef>
c@225: 
c@225: //////////////////////////////////////////////////////////////////////
c@225: // Construction/Destruction
c@225: //////////////////////////////////////////////////////////////////////
c@225: 
c@225: Framer::Framer()
c@225: {
c@225:     m_dataFrame = NULL;
c@225:     m_strideFrame = NULL;
c@225: }
c@225: 
c@225: Framer::~Framer()
c@225: {
cannam@483:     if( m_dataFrame != NULL ) {
cannam@483:         delete [] m_dataFrame;
cannam@483:     }
c@225: 
cannam@483:     if( m_strideFrame != NULL ) {
cannam@483:         delete [] m_strideFrame;
cannam@483:     }
c@225: }
c@225: 
c@225: void Framer::configure( unsigned int frameLength, unsigned int hop )
c@225: {
c@225:     m_frameLength = frameLength;
c@225:     m_stepSize = hop;
c@225: 
c@225:     resetCounters();
c@225: 
cannam@483:     if( m_dataFrame != NULL ) {
cannam@483:         delete [] m_dataFrame;  
cannam@483:         m_dataFrame = NULL;
c@225:     }
c@225:     m_dataFrame = new double[ m_frameLength ];
c@225: 
cannam@483:     if( m_strideFrame != NULL ) {
cannam@483:         delete [] m_strideFrame;        
cannam@483:         m_strideFrame = NULL;
c@225:     }
c@225:     m_strideFrame = new double[ m_stepSize ];
c@225: }
c@225: 
c@225: void Framer::getFrame(double *dst)
c@225: {
c@225: 
cannam@483:     if( (m_ulSrcIndex + ( m_frameLength) ) < m_ulSampleLen ) {
c@225: 
cannam@483:         for( unsigned int u = 0; u < m_frameLength; u++) {
cannam@483:             dst[ u ] = m_srcBuffer[ m_ulSrcIndex++ ]; 
cannam@483:         }       
cannam@483:         m_ulSrcIndex -= ( m_frameLength - m_stepSize );
c@225: 
cannam@483:     } else {
cannam@483: 
cannam@483:         unsigned int rem = (m_ulSampleLen - m_ulSrcIndex );
cannam@483:         unsigned int zero = m_frameLength - rem;
cannam@483: 
cannam@483:         for( unsigned int u = 0; u < rem; u++ ) {
cannam@483:             dst[ u ] = m_srcBuffer[ m_ulSrcIndex++ ];
cannam@483:         }
cannam@483:                 
cannam@483:         for( unsigned int u = 0; u < zero; u++ ) {
cannam@483:             dst[ rem + u ] = 0;
cannam@483:         }
cannam@483: 
cannam@483:         m_ulSrcIndex -= (( rem - m_stepSize ) );
c@225:     }
c@225: 
c@225:     m_framesRead++;
c@225: }
c@225: 
c@225: void Framer::resetCounters()
c@225: {
c@225:     m_framesRead = 0;
c@225:     m_ulSrcIndex = 0;
c@225: }
c@225: 
c@225: unsigned int Framer::getMaxNoFrames()
c@225: {
c@225:     return m_maxFrames;
c@225: }
c@225: 
c@225: void Framer::setSource(double *src, unsigned int length)
c@225: {
c@225:     m_srcBuffer = src;
c@225:     m_ulSampleLen = length;
c@225: 
c@225:     m_maxFrames = (unsigned int)ceil( (double)m_ulSampleLen/(double)m_stepSize ) ;
c@225: }