ref: d8c21a32aec0fd7e13fb8e45ee5f630dc7bce1dd
dir: /src/effects/timestretch_rubberband.c/
/*
Copyright (C) 2016 Paul Brossier <piem@aubio.org>
This file is part of aubio.
aubio 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 3 of the License, or
(at your option) any later version.
aubio 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 aubio. If not, see <http://www.gnu.org/licenses/>.
*/
#include "aubio_priv.h"
#ifdef HAVE_RUBBERBAND
#include "fvec.h"
#include "fmat.h"
#include "io/source.h"
#include "effects/timestretch.h"
#include <rubberband/rubberband-c.h>
#define MIN_STRETCH_RATIO 0.025
#define MAX_STRETCH_RATIO 40.
#define HAVE_THREADS 1
#if 0
#undef HAVE_THREADS
#endif
#ifdef HAVE_THREADS
#include <pthread.h>
#endif
/** generic time stretching structure */
struct _aubio_timestretch_t
{
uint_t samplerate; /**< samplerate */
uint_t hopsize; /**< hop size */
smpl_t stretchratio; /**< time ratio */
smpl_t pitchscale; /**< pitch scale */
RubberBandState rb;
RubberBandOptions rboptions;
};
extern RubberBandOptions aubio_get_rubberband_opts(const char_t *mode);
//static void aubio_timestretch_warmup (aubio_timestretch_t * p);
aubio_timestretch_t *
new_aubio_timestretch (const char_t * mode, smpl_t stretchratio, uint_t hopsize,
uint_t samplerate)
{
aubio_timestretch_t *p = AUBIO_NEW (aubio_timestretch_t);
p->hopsize = hopsize;
p->pitchscale = 1.;
if ((sint_t)hopsize <= 0) {
AUBIO_ERR("timestretch: hopsize should be > 0, got %d\n", hopsize);
goto beach;
}
if ((sint_t)samplerate <= 0) {
AUBIO_ERR("timestretch: samplerate should be > 0, got %d\n", samplerate);
goto beach;
}
if (stretchratio <= MAX_STRETCH_RATIO && stretchratio >= MIN_STRETCH_RATIO) {
p->stretchratio = stretchratio;
} else {
AUBIO_ERR("timestretch: stretchratio should be in the range [%.3f, %.3f], got %f\n",
MIN_STRETCH_RATIO, MAX_STRETCH_RATIO, stretchratio);
goto beach;
}
p->rboptions = aubio_get_rubberband_opts(mode);
if (p->rboptions < 0) {
AUBIO_ERR("timestretch: unknown time stretching method %s\n", mode);
goto beach;
}
p->rb = rubberband_new(samplerate, 1, p->rboptions, p->stretchratio, p->pitchscale);
if (!p->rb) goto beach;
p->samplerate = samplerate;
//aubio_timestretch_warmup(p);
return p;
beach:
del_aubio_timestretch(p);
return NULL;
}
#if 0
static void
aubio_timestretch_warmup (aubio_timestretch_t * p)
{
// warm up rubber band
//AUBIO_WRN("timestretch: warming-up\n");
unsigned int latency = MAX(p->hopsize, rubberband_get_latency(p->rb));
fvec_t *input = new_fvec(p->hopsize);
while (aubio_timestretch_push(p, input, input->length) < (int)latency) {
//sint_t available = aubio_timestretch_get_available(p);
//AUBIO_WRN("timestretch: warmup got %d, latency: %d\n", available, latency);
}
del_fvec(input);
}
#endif
void
del_aubio_timestretch (aubio_timestretch_t * p)
{
if (p->rb) {
rubberband_delete(p->rb);
}
AUBIO_FREE (p);
}
uint_t
aubio_timestretch_get_samplerate (aubio_timestretch_t * p)
{
return p->samplerate;
}
uint_t aubio_timestretch_get_latency (aubio_timestretch_t * p) {
return rubberband_get_latency(p->rb);
}
uint_t
aubio_timestretch_set_stretch (aubio_timestretch_t * p, smpl_t stretch)
{
if (!p->rb) {
AUBIO_ERR("timestretch: could not set stretch ratio,"
" rubberband not created\n");
return AUBIO_FAIL;
}
if (stretch >= MIN_STRETCH_RATIO && stretch <= MAX_STRETCH_RATIO) {
p->stretchratio = stretch;
rubberband_set_time_ratio(p->rb, 1./p->stretchratio);
return AUBIO_OK;
} else {
AUBIO_ERR("timestretch: could not set stretch ratio to '%f',"
" should be in the range [%.2f, %.2f].\n", stretch,
MIN_STRETCH_RATIO, MAX_STRETCH_RATIO);
return AUBIO_FAIL;
}
}
smpl_t
aubio_timestretch_get_stretch (aubio_timestretch_t * p)
{
return p->stretchratio;
}
uint_t
aubio_timestretch_set_pitchscale (aubio_timestretch_t * p, smpl_t pitchscale)
{
if (!p->rb) {
AUBIO_ERR("timestretch: could not set pitch scale,"
" rubberband not created\n");
return AUBIO_FAIL;
}
if (pitchscale >= 0.0625 && pitchscale <= 4.) {
p->pitchscale = pitchscale;
rubberband_set_pitch_scale(p->rb, p->pitchscale);
return AUBIO_OK;
} else {
AUBIO_ERR("timestretch: could not set pitchscale to '%f',"
" should be in the range [0.0625, 4.].\n", pitchscale);
return AUBIO_FAIL;
}
}
smpl_t
aubio_timestretch_get_pitchscale (aubio_timestretch_t * p)
{
return p->pitchscale;
}
uint_t
aubio_timestretch_set_transpose(aubio_timestretch_t * p, smpl_t transpose)
{
if (transpose >= -24. && transpose <= 24.) {
smpl_t pitchscale = POW(2., transpose / 12.);
return aubio_timestretch_set_pitchscale(p, pitchscale);
} else {
AUBIO_ERR("timestretch: could not set transpose to '%f',"
" should be in the range [-24; 24].\n", transpose);
return AUBIO_FAIL;
}
}
smpl_t
aubio_timestretch_get_transpose(aubio_timestretch_t * p)
{
return 12. * LOG(p->pitchscale) / LOG(2.0);
}
sint_t
aubio_timestretch_push(aubio_timestretch_t *p, fvec_t *input, uint_t length)
{
// push new samples to rubberband, return available
int available;
int eof = (input->length != length) ? 1 : 0;
rubberband_process(p->rb, (const float* const*)&(input->data), length, eof);
available = rubberband_available(p->rb);
//AUBIO_WRN("timestretch: processed %d, %d available, eof: %d\n",
// length, available, eof);
return available;
}
sint_t
aubio_timestretch_get_available(aubio_timestretch_t *p) {
return rubberband_available(p->rb);
}
void
aubio_timestretch_do(aubio_timestretch_t * p, fvec_t * out, uint_t * read)
{
// now retrieve the samples and write them into out->data
int available = rubberband_available(p->rb);
if (available >= (int)out->length) {
rubberband_retrieve(p->rb, (float* const*)&(out->data), out->length);
*read = out->length;
} else if (available > 0) {
// this occurs each time the end of file is reached
//AUBIO_WRN("timestretch: short read\n");
rubberband_retrieve(p->rb, (float* const*)&(out->data), available);
fvec_t zeros; zeros.length = out->length - available; zeros.data = out->data + available;
fvec_zeros(&zeros);
*read = available;
} else {
// this may occur if the previous was a short read available == hopsize
fvec_zeros(out);
*read = 0;
}
}
uint_t
aubio_timestretch_reset(aubio_timestretch_t *p)
{
uint_t err = AUBIO_OK;
if (p->rb) {
rubberband_reset(p->rb);
}
return err;
}
#endif