ref: a7ec22a8ea9f6480ae3e7e15710c991f80f79dcd
dir: /testsuite/lpc_resynth_main.c/
/*************************************************************************/
/* */
/* Language Technologies Institute */
/* Carnegie Mellon University */
/* Copyright (c) 2010 */
/* All Rights Reserved. */
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/* Permission is hereby granted, free of charge, to use and distribute */
/* this software and its documentation without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of this work, and to */
/* permit persons to whom this work is furnished to do so, subject to */
/* the following conditions: */
/* 1. The code must retain the above copyright notice, this list of */
/* conditions and the following disclaimer. */
/* 2. Any modifications must be clearly marked as such. */
/* 3. Original authors' names are not deleted. */
/* 4. The authors' names are not used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* CARNEGIE MELLON UNIVERSITY AND THE CONTRIBUTORS TO THIS WORK */
/* DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING */
/* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT */
/* SHALL CARNEGIE MELLON UNIVERSITY NOR THE CONTRIBUTORS BE LIABLE */
/* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */
/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN */
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/* THIS SOFTWARE. */
/* */
/*************************************************************************/
/* Author: Alan W Black (awb@cs.cmu.edu) */
/* Date: April 2010 */
/*************************************************************************/
/* */
/* Resynthesize lpc with various techniques */
/*************************************************************************/
#include <stdio.h>
#include "flite.h"
#include "cst_track.h"
#include "cst_wave.h"
#include "cst_tokenstream.h"
#include "cst_args.h"
#include "cst_math.h"
void lpc2ref(const float *lpc, float *rfc, int order);
void ref2lpc(const float *rfc, float *lpc, int order);
static double plus_or_minus_one()
{
/* Randomly return 1 or -1 */
/* not sure rand() is portable */
if (rand() > RAND_MAX/2.0)
return 1.0;
else
return -1.0;
}
static double rand_zero_to_one()
{
/* Return number between 0.0 and 1.0 */
return rand()/(float)RAND_MAX;
}
int main(int argc, char **argv)
{
cst_track *t1;
cst_track *me_filters=NULL;
cst_wave *w1, *w2, *res=NULL;
cst_val *files;
cst_features *args;
int i, j;
int order, o, s;
int frame_length;
float *lpcs, *residual;
float m;
const char *f1, *f2;
const char *resfn = NULL;
int last_peak = 0, next_peak;
int period;
float power;
int rfc=0;
int str=0;
int fn, fo, ss;
float xpulse, xnoise;
float fxpulse, fxnoise;
float x, me;
float *hpulse=NULL, *hnoise=NULL;
float *xpulsesig=NULL, *xnoisesig=NULL;
int q=0;
int position;
int lpc_start = 0;
args = new_features();
files =
cst_args(argv,argc,
"usage: lpc_resynth OPTIONS INTRACK OUTWAVE\n"
"Resynth an lpc track\n"
"-res <string> residual (as waveform)\n"
"-save_res Save the generated residual\n"
"-lpc_start <int> start of lpc params in lpc track {1}\n"
"-order <int> LPC order {16}\n"
"-str mixed excitation strengths\n"
"-me_filters <string> mixed excitation filters\n"
"-rfc Coefficents are reflection coefficients\n",
args);
f1 = val_string(val_car(files));
f2 = val_string(val_car(val_cdr(files)));
t1 = new_track();
lpc_start = flite_get_param_int(args,"-lpc_start",1);
if (feat_present(args,"-rfc"))
rfc = 1;
if (feat_present(args,"-str"))
str = 1;
if (feat_present(args,"-me_filters"))
{
me_filters = new_track();
if (cst_track_load_est(me_filters,flite_get_param_string(args,"-me_filters","me_filters.track")) != CST_OK_FORMAT)
{
fprintf(stderr,
"lpc_resynth: can't read file or wrong format \"%s\"\n",
f1);
return -1;
}
hpulse = cst_alloc(float,me_filters->num_channels);
hnoise = cst_alloc(float,me_filters->num_channels);
xpulsesig = cst_alloc(float,me_filters->num_channels);
xnoisesig = cst_alloc(float,me_filters->num_channels);
}
if (cst_track_load_est(t1,f1) != CST_OK_FORMAT)
{
fprintf(stderr,
"lpc_resynth: can't read file or wrong format \"%s\"\n",
f1);
return -1;
}
w1 = new_wave();
w1->sample_rate = 16000;
cst_wave_resize(w1,160+(int)(t1->times[t1->num_frames-1]*w1->sample_rate),1);
if (feat_present(args,"-res"))
{
res = new_wave();
resfn = flite_get_param_string(args,"-res","res.wav");
if (cst_wave_load_riff(res,resfn) != CST_OK_FORMAT)
{
fprintf(stderr,
"lpc_resynth: can't read file or wrong format \"%s\"\n",
resfn);
}
}
w2 = copy_wave(w1);
order = flite_get_param_int(args,"-order",16);
lpcs = cst_alloc(float,order);
s = order;
residual = NULL;
for (i=1; i<t1->num_frames; i++)
{
frame_length = 10+(int)(w1->sample_rate*t1->times[i])-s;
cst_free(residual);
residual = cst_alloc(float,frame_length);
/* LPC coefficients */
if (rfc == 1)
ref2lpc(&(t1->frames[i][lpc_start]),lpcs,order);
else
{
for (o=0; o<order; o++)
lpcs[o] = t1->frames[i][lpc_start+o];
}
/* Residual */
/* Mixed excitation residual */
if (str)
{
for (fo=0; fo<me_filters->num_channels; fo++)
{
hpulse[fo] = hnoise[fo] = 0.0;
ss=order+2;
for (fn=0; fn<me_filters->num_frames; fn++)
{
me = me_filters->frames[fn][fo];
hpulse[fo] += t1->frames[i][ss+fn] * me;
hnoise[fo] += (1 - t1->frames[i][ss+fn]) * me;
}
}
/* For each sample in the frame */
for (j=0; j<frame_length; j++)
{
xnoise = plus_or_minus_one();
if (t1->frames[i][0] == 0)
{
xpulse = 0.0; /* unvoiced */
}
else
{ /* voiced */
period = w1->sample_rate/t1->frames[i][0];
next_peak = last_peak + period;
#if 0
if (next_peak < (s + j))
{ /* voiced peak in this frame */
xpulse = sqrt(period); /* sqrt ??? */
last_peak = next_peak;
}
#endif
#if 1
if (q == 3)
{
xpulse = sqrt(period)/4.0; q--;
}
else if (q == 2)
{
xpulse = sqrt(period)/2.0; q--;
}
else if (q == 1)
{
xpulse = sqrt(period)/4.0; q--;
}
else if (next_peak < (s + j))
{
xpulse = sqrt(period)/4.0;
q = 3;
last_peak = next_peak;
}
#endif
else
xpulse = 0;
}
fxpulse = fxnoise = 0.0;
for (fo=me_filters->num_channels-1; fo>0; fo--)
{
fxpulse += hpulse[fo] * xpulsesig[fo];
fxnoise += hnoise[fo] * xnoisesig[fo];
xpulsesig[fo] = xpulsesig[fo-1];
xnoisesig[fo] = xnoisesig[fo-1];
}
fxpulse += hpulse[0] * xpulse;
fxnoise += hnoise[0] * xnoise;
xpulsesig[0] = xpulse;
xnoisesig[0] = xnoise;
x = fxpulse + fxnoise; /* excitation is pulse plus noise */
residual[j] = x * sqrt(t1->frames[i][1]);
}
}
/* predefined residual */
else if (resfn)
{
for (j=0; j<frame_length; j++)
residual[j] = res->samples[s-order+j];
}
/* Spike plus white noise */
else if ((t1->frames[i][0] == 0) ||
(t1->frames[i][t1->num_channels-1] == 0))
{ /* unvoiced */
printf("awb_debug unvoiced %d\n",i);
m = sqrt(t1->frames[i][1]);
for (j=0; j<frame_length; j++)
residual[j] = m*rand_zero_to_one()*plus_or_minus_one();
last_peak = s; /* identify where next pulse should be */
}
else
{ /* voiced */
printf("awb_debug voiced %d\n",i);
period = w1->sample_rate/t1->frames[i][0];
next_peak = last_peak + period;
memset(residual,0,sizeof(float)*frame_length);
if (next_peak < (s + frame_length))
{
printf("awb_debug ping voiced %d\n",i);
power = sqrt(t1->frames[i][1])*frame_length;
if (next_peak-s < 2)
position=2;
else
position=next_peak-s;
residual[position-2] = power/4;
residual[position-1] = power/2;
residual[position] = power/4;
last_peak = next_peak;
}
}
/* LPC resynthesis */
for (j=0; j< frame_length; j++)
{
w1->samples[s] = residual[j];
w2->samples[s] = residual[j];
for (o=0; (o < order) && ((s-order) > 0); o++)
w1->samples[s] += lpcs[o]*w1->samples[s-o-1];
s++;
}
}
cst_wave_save_riff(w1,f2);
if (feat_present(args,"-save_res"))
cst_wave_save_riff(w2,"residual.wav");
cst_free(residual);
cst_free(hpulse);
cst_free(hnoise);
cst_free(xpulsesig);
cst_free(xnoisesig);
delete_features(args);
delete_wave(w1);
delete_wave(w2);
delete_wave(res);
delete_track(t1);
delete_track(me_filters);
return 0;
}