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/*
* Copyright (c) 2009 John Glover, National University of Ireland, Maynooth
*
* 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.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*! \file modify.c
* \brief modify sms data
*/
#include "sms.h"
/*! \brief initialize a modifications structure based on an SMS_Header
*
* \param params pointer to parameter structure
* \param header pointer to sms header
*/
void sms_initModify(SMS_Header *header, SMS_ModifyParams *params)
{
static int sizeEnvArray = 0;
params->maxFreq = header->iMaxFreq;
params->sizeSinEnv = header->nEnvCoeff;
if(sizeEnvArray < params->sizeSinEnv)
{
if(sizeEnvArray != 0) free(params->sinEnv);
if ((params->sinEnv = (sfloat *) malloc(params->sizeSinEnv * sizeof(sfloat))) == NULL)
{
sms_error("could not allocate memory for envelope array");
return;
}
sizeEnvArray = params->sizeSinEnv;
}
params->ready = 1;
}
/*! \brief initialize modification parameters
*
* \todo call this from sms_initSynth()? some other mod params are updated there
*
* \param params pointer to parameters structure
*/
void sms_initModifyParams(SMS_ModifyParams *params)
{
params->ready = 0;
params->doResGain = 0;
params->resGain = 1.;
params->doTranspose = 0;
params->transpose = 0;
params->doSinEnv = 0;
params->sinEnvInterp = 0.;
params->sizeSinEnv = 0;
params->doResEnv = 0;
params->resEnvInterp = 0.;
params->sizeResEnv = 0;
}
/*! \brief free memory allocated during initialization
*
* \param params pointer to parameter structure
*/
void sms_freeModify(SMS_ModifyParams *params)
{
}
/*! \brief linear interpolation between 2 spectral envelopes.
*
* The values in env2 are overwritten by the new interpolated envelope values.
*/
void sms_interpEnvelopes(int sizeEnv, sfloat *env1, sfloat *env2, sfloat interpFactor)
{
if(sizeEnv <= 0)
{
return;
}
int i;
sfloat amp1, amp2;
for(i = 0; i < sizeEnv; i++)
{
amp1 = env1[i];
amp2 = env2[i];
if(amp1 <= 0) amp1 = amp2;
if(amp2 <= 0) amp2 = amp1;
env2[i] = amp1 + (interpFactor * (amp2 - amp1));
}
}
/*! \brief apply the spectral envelope of 1 sound to another
*
* Changes the amplitude of spectral peaks in a target sound (pFreqs, pMags) to match those
* in the envelope (pCepEnvFreqs, pCepEnvMags) of another, up to a maximum frequency of maxFreq.
*/
void sms_applyEnvelope(int numPeaks, sfloat *pFreqs, sfloat *pMags, int sizeEnv, sfloat *pEnvMags, int maxFreq)
{
if(sizeEnv <= 0 || maxFreq <= 0)
{
return;
}
int i, envPos;
sfloat frac, binSize = (sfloat)maxFreq / (sfloat)sizeEnv;
for(i = 0; i < numPeaks; i++)
{
/* convert peak freqs into bin positions for quicker envelope lookup */
/* \todo try to remove so many pFreq lookups and get rid of divide */
pFreqs[i] /= binSize;
/* if current peak is within envelope range, set its mag to the envelope mag */
if(pFreqs[i] < (sizeEnv-1) && pFreqs[i] > 0)
{
envPos = (int)pFreqs[i];
frac = pFreqs[i] - envPos;
if(envPos < sizeEnv - 1)
{
pMags[i] = ((1.0 - frac) * pEnvMags[envPos]) + (frac * pEnvMags[envPos+1]);
}
else
{
pMags[i] = pEnvMags[sizeEnv-1];
}
}
else
{
pMags[i] = 0;
}
/* convert back to frequency values */
pFreqs[i] *= binSize;
}
}
/*! \brief scale the residual gain factor
*
* \param frame pointer to sms data
* \param gain factor to scale the residual
*/
void sms_resGain(SMS_Data *frame, sfloat gain)
{
int i;
for( i = 0; i < frame->nCoeff; i++)
frame->pFStocCoeff[i] *= gain;
}
/*! \brief basic transposition
* Multiply the frequencies of the deterministic component by a constant
*/
void sms_transpose(SMS_Data *frame, sfloat transpositionFactor)
{
int i;
for(i = 0; i < frame->nTracks; i++)
{
frame->pFSinFreq[i] *= sms_scalarTempered(transpositionFactor);
}
}
/*! \brief transposition maintaining spectral envelope
*
* Multiply the frequencies of the deterministic component by a constant, then change
* their amplitudes so that the original spectral envelope is maintained
*/
void sms_transposeKeepEnv(SMS_Data *frame, sfloat transpositionFactor, int maxFreq)
{
sms_transpose(frame, transpositionFactor);
sms_applyEnvelope(frame->nTracks, frame->pFSinFreq, frame->pFSinAmp, frame->nEnvCoeff, frame->pSpecEnv, maxFreq);
}
/*! \brief modify a frame (SMS_Data object)
*
* Performs a modification on a SMS_Data object. The type of modification and any additional
* parameters are specified in the given SMS_ModifyParams structure.
*/
void sms_modify(SMS_Data *frame, SMS_ModifyParams *params)
{
if(params->doResGain)
sms_resGain(frame, params->resGain);
if(params->doTranspose)
sms_transpose(frame, params->transpose);
if(params->doSinEnv)
{
if(params->sinEnvInterp < .00001) /* maintain original */
sms_applyEnvelope(frame->nTracks, frame->pFSinFreq, frame->pFSinAmp,
frame->nEnvCoeff, frame->pSpecEnv, params->maxFreq);
else
{
if(params->sinEnvInterp > .00001 && params->sinEnvInterp < .99999)
sms_interpEnvelopes(params->sizeSinEnv, frame->pSpecEnv, params->sinEnv, params->sinEnvInterp);
sms_applyEnvelope(frame->nTracks, frame->pFSinFreq, frame->pFSinAmp,
params->sizeSinEnv, params->sinEnv, params->maxFreq);
}
}
}
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