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pv-conventional.c
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pv-conventional.c
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/* PV - phase vocoder : pv-conventional.c
* Copyright (C) 2007-2013 Kengo Ichiki <[email protected]>
*
* 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.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
// FFTW library
#include <fftw3.h>
// half-complex format handling routines
#include "hc.h"
#include "fft.h" // windowing()
// libsndfile
#include <sndfile.h>
#include "snd.h"
// ao device
#include <ao/ao.h>
#include "ao-wrapper.h"
// samplerate
#include <samplerate.h>
#include "memory-check.h" // CHECK_MALLOC() macro
/** general utility routines for pv **/
/*
* INPUT
* hop_res :
* hop_syn :
* l_out [hop_syn] :
* r_out [hop_syn] :
* ao, sfout, sfout_info : properties for output
*/
int
pv_play_resample (long hop_res, long hop_syn,
double *l_out, double *r_out,
ao_device *ao, SNDFILE *sfout, SF_INFO *sfout_info)
{
int status = 0;
int i;
// samplerate conversion
float *fl_in = NULL;
float *fl_out = NULL;
double *l_out_src = NULL;
double *r_out_src = NULL;
SRC_DATA srdata;
if (hop_res != hop_syn)
{
fl_in = (float *)malloc (sizeof (float) * 2 * hop_syn);
fl_out = (float *)malloc (sizeof (float) * 2 * hop_res);
CHECK_MALLOC (fl_in, "pv_play_resample");
CHECK_MALLOC (fl_out, "pv_play_resample");
srdata.input_frames = hop_syn;
srdata.output_frames = hop_res;
srdata.src_ratio = (double)hop_res / (double)hop_syn;
srdata.data_in = fl_in;
srdata.data_out = fl_out;
l_out_src = (double *)malloc (sizeof (double) * hop_res);
r_out_src = (double *)malloc (sizeof (double) * hop_res);
CHECK_MALLOC (l_out_src, "pv_play_resample");
CHECK_MALLOC (r_out_src, "pv_play_resample");
// samplerate conversion (time fixed)
for (i = 0; i < hop_syn; i ++)
{
fl_in [i*2 + 0] = (float)l_out [i];
fl_in [i*2 + 1] = (float)r_out [i];
}
status = src_simple (&srdata, SRC_SINC_BEST_QUALITY, 2);
//status = src_simple (&srdata, SRC_SINC_FASTEST, 2);
if (status != 0)
{
fprintf (stderr, "fail to samplerate conversion\n");
exit (1);
}
for (i = 0; i < hop_res; i ++)
{
l_out_src [i] = (double)fl_out [i*2 + 0];
r_out_src [i] = (double)fl_out [i*2 + 1];
}
// output
if (sfout == NULL)
{
status = ao_write (ao, l_out_src, r_out_src, hop_res);
status /= 4; // 2 bytes for 2 channels
}
else
{
status = sndfile_write (sfout, *sfout_info,
l_out_src, r_out_src, hop_res);
}
free (fl_in);
free (fl_out);
free (l_out_src);
free (r_out_src);
}
else
{
// no samplerate conversion (pitch fixed)
// output
if (sfout == NULL)
{
status = ao_write (ao, l_out, r_out, hop_syn);
status /= 4; // 2 bytes for 2 channels
}
else
{
status = sndfile_write (sfout, *sfout_info,
l_out, r_out, hop_syn);
}
}
return (status);
}
/* estimate the superposing weight for the window with hop
*/
double
get_scale_factor_for_window (int len, long hop_syn, int flag_window)
{
double *x = NULL;
x = (double *)malloc (sizeof (double) * len);
CHECK_MALLOC (x, "get_scale_factor_for_window");
int i;
for (i = 0; i < len; i ++)
{
x [i] = 1.0;
}
windowing (len, x, flag_window, 1.0, x);
double acc = 0.0;
double acc_max;
acc_max = 0.0;
int j;
for (j = 0; j < hop_syn; j++)
{
acc = 0.0;
for (i = 0; i < len; i += hop_syn)
{
acc += x [j + i];
}
if (acc_max < acc) acc_max = acc;
}
free (x);
// extra safety
acc *= 1.5;
return (acc);
}
/* standard phase vocoder
* Ref: J.Laroche and M.Dolson (1999)
*/
void pv_conventional (const char *file, const char *outfile,
double rate, double pitch_shift,
long len, long hop_syn,
int flag_window)
{
long hop_ana;
long hop_res;
hop_res = (long)((double)hop_syn * pow (2.0, - pitch_shift / 12.0));
hop_ana = (long)((double)hop_res * rate);
double twopi = 2.0 * M_PI;
int i;
int k;
// open the input file
long read_status;
// libsndfile version
SNDFILE *sf = NULL;
SF_INFO sfinfo;
memset (&sfinfo, 0, sizeof (sfinfo));
sf = sf_open (file, SFM_READ, &sfinfo);
if (sf == NULL)
{
fprintf (stderr, "fail to open %s\n", file);
exit (1);
}
sndfile_print_info (&sfinfo);
/* allocate buffers */
double * left = NULL;
double * right = NULL;
left = (double *) malloc (sizeof (double) * len);
right = (double *) malloc (sizeof (double) * len);
CHECK_MALLOC (left, "pv_conventional");
CHECK_MALLOC (right, "pv_conventional");
// prepare the output
int status;
ao_device *ao = NULL;
SNDFILE *sfout = NULL;
SF_INFO sfout_info;
if (outfile == NULL)
{
ao = ao_init_16_stereo (sfinfo.samplerate, 1 /* verbose */);
}
else
{
sfout = sndfile_open_for_write (&sfout_info,
outfile,
sfinfo.samplerate,
sfinfo.channels);
if (sfout == NULL)
{
fprintf (stderr, "fail to open file %s\n", outfile);
exit (1);
}
}
double window_scale;
window_scale = get_scale_factor_for_window (len, hop_syn, flag_window);
/* initialization plan for FFTW */
double *time = NULL;
double *freq = NULL;
time = (double *)fftw_malloc (len * sizeof(double));
freq = (double *)fftw_malloc (len * sizeof(double));
CHECK_MALLOC (time, "pv_conventional");
CHECK_MALLOC (freq, "pv_conventional");
fftw_plan plan;
plan = fftw_plan_r2r_1d (len, time, freq, FFTW_R2HC, FFTW_ESTIMATE);
double *t_out = NULL;
double *f_out = NULL;
f_out = (double *)fftw_malloc (len * sizeof(double));
t_out = (double *)fftw_malloc (len * sizeof(double));
CHECK_MALLOC (f_out, "pv_conventional");
CHECK_MALLOC (t_out, "pv_conventional");
fftw_plan plan_inv;
plan_inv = fftw_plan_r2r_1d (len, f_out, t_out,
FFTW_HC2R, FFTW_ESTIMATE);
double *amp = NULL;
double *ph_in = NULL;
amp = (double *)malloc (((len/2)+1) * sizeof(double));
ph_in = (double *)malloc (((len/2)+1) * sizeof(double));
CHECK_MALLOC (amp, "pv_conventional");
CHECK_MALLOC (ph_in, "pv_conventional");
double *l_ph_out = NULL;
double *r_ph_out = NULL;
l_ph_out = (double *)malloc (((len/2)+1) * sizeof(double));
r_ph_out = (double *)malloc (((len/2)+1) * sizeof(double));
CHECK_MALLOC (l_ph_out, "pv_conventional");
CHECK_MALLOC (r_ph_out, "pv_conventional");
double *l_ph_in_old = NULL;
double *r_ph_in_old = NULL;
l_ph_in_old = (double *)malloc (((len/2)+1) * sizeof(double));
r_ph_in_old = (double *)malloc (((len/2)+1) * sizeof(double));
CHECK_MALLOC (l_ph_in_old, "pv_conventional");
CHECK_MALLOC (r_ph_in_old, "pv_conventional");
for (i = 0; i < (len/2)+1; i ++)
{
ph_in [i] = 0.0;
l_ph_out [i] = 0.0;
r_ph_out [i] = 0.0;
l_ph_in_old [i] = 0.0;
r_ph_in_old [i] = 0.0;
}
double *l_out = NULL;
double *r_out = NULL;
l_out = (double *) malloc ((hop_syn + len) * sizeof(double));
r_out = (double *) malloc ((hop_syn + len) * sizeof(double));
CHECK_MALLOC (l_out, "pv_conventional");
CHECK_MALLOC (r_out, "pv_conventional");
for (i = 0; i < (hop_syn + len); i ++)
{
l_out [i] = 0.0;
r_out [i] = 0.0;
}
// expected frequency
double * omega = NULL;
omega = (double *) malloc (((len/2)+1) * sizeof(double));
CHECK_MALLOC (omega, "pv_conventional");
for (k = 0; k < (len/2)+1; k ++)
{
omega [k] = twopi * (double)k / (double)len;
}
// read the first frame
read_status = sndfile_read (sf, sfinfo, left, right, len);
if (read_status != len)
{
exit (1);
}
int flag_ph = 0;
for (;;)
{
// left channel
apply_FFT (len, left, flag_window, plan, time, freq,
1.0,
amp, ph_in);
if (flag_ph == 0)
{
// initialize phase
for (k = 0; k < (len/2)+1; k ++)
{
l_ph_out [k] = ph_in [k] * (double)hop_syn / (double)hop_ana;
//l_ph_out [k] = ph_in [k];
// backup for the next step
l_ph_in_old [k] = ph_in [k];
}
//flag_ph = 1; // right channel is in the following!
}
else
{
// only for imag components who have phase
for (k = 1; k < ((len+1)/2); k ++)
{
double dphi;
dphi = ph_in [k] - l_ph_in_old [k]
- omega [k] * (double)hop_ana;
for (; dphi >= M_PI; dphi -= twopi);
for (; dphi < -M_PI; dphi += twopi);
l_ph_out [k] += dphi * (double)hop_syn / (double)hop_ana
+ omega [k] * (double)hop_syn;
l_ph_in_old [k] = ph_in [k];
}
}
polar_to_HC (len, amp, l_ph_out, 0, f_out);
fftw_execute (plan_inv);
// scale by len and windowing
windowing (len, t_out, flag_window, (double)len * window_scale, t_out);
// superimpose
for (i = 0; i < len; i ++)
{
l_out [hop_syn + i] += t_out [i];
}
// right channel
apply_FFT (len, right, flag_window, plan, time, freq,
1.0,
amp, ph_in);
if (flag_ph == 0)
{
// initialize phase
for (k = 0; k < (len/2)+1; k ++)
{
r_ph_out [k] = ph_in [k] * (double)hop_syn / (double)hop_ana;
//r_ph_out [k] = ph_in [k];
// backup for the next step
r_ph_in_old [k] = ph_in [k];
}
flag_ph = 1;
}
else
{
// only for imag components who have phase
for (k = 1; k < ((len+1)/2); k ++)
{
double dphi;
dphi = ph_in [k] - r_ph_in_old [k]
- omega [k] * (double)hop_ana;
for (; dphi >= M_PI; dphi -= twopi);
for (; dphi < -M_PI; dphi += twopi);
r_ph_out [k] += dphi * (double)hop_syn / (double)hop_ana
+ omega [k] * (double)hop_syn;
r_ph_in_old [k] = ph_in [k];
}
}
polar_to_HC (len, amp, r_ph_out, 0, f_out);
fftw_execute (plan_inv);
// scale by len and windowing
//windowing (len, t_out, flag_window, (double)len, t_out);
windowing (len, t_out, flag_window, (double)len * window_scale, t_out);
// superimpose
for (i = 0; i < len; i ++)
{
r_out [hop_syn + i] += t_out [i];
}
// output
status = pv_play_resample (hop_res, hop_syn, l_out, r_out,
ao, sfout, &sfout_info);
/* shift acc_out by hop_syn */
for (i = 0; i < len; i ++)
{
l_out [i] = l_out [i + hop_syn];
r_out [i] = r_out [i + hop_syn];
}
for (i = len; i < len + hop_syn; i ++)
{
l_out [i] = 0.0;
r_out [i] = 0.0;
}
/* for the next step */
for (i = 0; i < (len - hop_ana); i ++)
{
left [i] = left [i + hop_ana];
right [i] = right [i + hop_ana];
}
/* read next segment */
read_status = sndfile_read (sf, sfinfo,
left + len - hop_ana,
right + len - hop_ana,
hop_ana);
if (read_status != hop_ana)
{
// most likely, it is EOF.
break;
}
}
sf_close (sf);
if (outfile == NULL)
{
ao_close (ao);
}
else
{
// frames left in l_out[] and r_out[]
status = sndfile_write (sfout, sfout_info, l_out, r_out, len);
sf_write_sync (sfout);
sf_close (sfout);
}
free (left);
free (right);
free (time);
free (freq);
fftw_destroy_plan (plan);
free (t_out);
free (f_out);
fftw_destroy_plan (plan_inv);
free (amp);
free (ph_in);
free (l_ph_out);
free (r_ph_out);
free (l_ph_in_old);
free (r_ph_in_old);
free (l_out);
free (r_out);
free (omega);
}