ref: c19f9e573b86231d4f8bdaa7cd6b6d2b0cf7c8aa
dir: /src/io/source_sndfile.c/
/*
Copyright (C) 2012 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 "config.h"
#ifdef HAVE_SNDFILE
#include <sndfile.h>
#include "aubio_priv.h"
#include "fvec.h"
#include "fmat.h"
#include "source_sndfile.h"
#include "temporal/resampler.h"
#define MAX_CHANNELS 6
#define MAX_SIZE 4096
#define MAX_SAMPLES MAX_CHANNELS * MAX_SIZE
struct _aubio_source_sndfile_t {
uint_t hop_size;
uint_t samplerate;
uint_t channels;
// some data about the file
char_t *path;
SNDFILE *handle;
int input_samplerate;
int input_channels;
int input_format;
// resampling stuff
smpl_t ratio;
uint_t input_hop_size;
#ifdef HAVE_SAMPLERATE
aubio_resampler_t *resampler;
fvec_t *input_data;
#endif /* HAVE_SAMPLERATE */
// some temporary memory for sndfile to write at
uint_t scratch_size;
smpl_t *scratch_data;
};
aubio_source_sndfile_t * new_aubio_source_sndfile(char_t * path, uint_t samplerate, uint_t hop_size) {
aubio_source_sndfile_t * s = AUBIO_NEW(aubio_source_sndfile_t);
if (path == NULL) {
AUBIO_ERR("Aborted opening null path\n");
return NULL;
}
s->hop_size = hop_size;
s->channels = 1;
s->path = path;
// try opening the file, geting the info in sfinfo
SF_INFO sfinfo;
AUBIO_MEMSET(&sfinfo, 0, sizeof (sfinfo));
s->handle = sf_open (s->path, SFM_READ, &sfinfo);
if (s->handle == NULL) {
/* show libsndfile err msg */
AUBIO_ERR("Failed opening %s: %s\n", s->path, sf_strerror (NULL));
goto beach;
}
/* get input specs */
s->input_samplerate = sfinfo.samplerate;
s->input_channels = sfinfo.channels;
s->input_format = sfinfo.format;
if (samplerate == 0) {
samplerate = s->input_samplerate;
//AUBIO_DBG("sampling rate set to 0, automagically adjusting to %d\n", samplerate);
}
s->samplerate = samplerate;
/* compute input block size required before resampling */
s->ratio = s->samplerate/(float)s->input_samplerate;
s->input_hop_size = (uint_t)FLOOR(s->hop_size / s->ratio + .5);
if (s->input_hop_size * s->input_channels > MAX_SAMPLES) {
AUBIO_ERR("Not able to process more than %d frames of %d channels\n",
MAX_SAMPLES / s->input_channels, s->input_channels);
goto beach;
}
#ifdef HAVE_SAMPLERATE
s->resampler = NULL;
s->input_data = NULL;
if (s->ratio != 1) {
s->input_data = new_fvec(s->input_hop_size);
s->resampler = new_aubio_resampler(s->ratio, 4);
if (s->ratio > 1) {
// we would need to add a ring buffer for these
if ( (uint_t)(s->input_hop_size * s->ratio + .5) != s->hop_size ) {
AUBIO_ERR("can not upsample from %d to %d\n", s->input_samplerate, s->samplerate);
goto beach;
}
AUBIO_WRN("upsampling %s from %d to % d\n", s->path, s->input_samplerate, s->samplerate);
}
}
#else
if (s->ratio != 1) {
AUBIO_ERR("aubio was compiled without aubio_resampler\n");
goto beach;
}
#endif /* HAVE_SAMPLERATE */
/* allocate data for de/interleaving reallocated when needed. */
s->scratch_size = s->input_hop_size * s->input_channels;
s->scratch_data = AUBIO_ARRAY(float,s->scratch_size);
return s;
beach:
AUBIO_ERR("can not read %s at samplerate %dHz with a hop_size of %d\n",
s->path, s->samplerate, s->hop_size);
del_aubio_source_sndfile(s);
return NULL;
}
void aubio_source_sndfile_do(aubio_source_sndfile_t * s, fvec_t * read_data, uint_t * read){
uint_t i,j, input_channels = s->input_channels;
/* do actual reading */
sf_count_t read_samples = sf_read_float (s->handle, s->scratch_data, s->scratch_size);
smpl_t *data;
#ifdef HAVE_SAMPLERATE
if (s->ratio != 1) {
data = s->input_data->data;
} else
#endif /* HAVE_SAMPLERATE */
{
data = read_data->data;
}
/* de-interleaving and down-mixing data */
for (j = 0; j < read_samples / input_channels; j++) {
data[j] = 0;
for (i = 0; i < input_channels; i++) {
data[j] += s->scratch_data[input_channels*j+i];
}
data[j] /= (smpl_t)input_channels;
}
#ifdef HAVE_SAMPLERATE
if (s->resampler) {
aubio_resampler_do(s->resampler, s->input_data, read_data);
}
#endif /* HAVE_SAMPLERATE */
*read = (int)FLOOR(s->ratio * read_samples / input_channels + .5);
if (*read < s->hop_size) {
for (j = *read; j < s->hop_size; j++) {
data[j] = 0;
}
}
}
void aubio_source_sndfile_do_multi(aubio_source_sndfile_t * s, fmat_t * read_data, uint_t * read){
uint_t i,j, input_channels = s->input_channels;
/* do actual reading */
sf_count_t read_samples = sf_read_float (s->handle, s->scratch_data, s->scratch_size);
smpl_t **data;
#ifdef HAVE_SAMPLERATE
if (s->ratio != 1) {
AUBIO_ERR("source_sndfile: no multi channel resampling yet");
return;
//data = s->input_data->data;
} else
#endif /* HAVE_SAMPLERATE */
{
data = read_data->data;
}
/* de-interleaving data */
for (j = 0; j < read_samples / input_channels; j++) {
for (i = 0; i < input_channels; i++) {
data[i][j] = (smpl_t)s->scratch_data[input_channels*j+i];
}
}
#ifdef HAVE_SAMPLERATE
if (s->resampler) {
//aubio_resampler_do(s->resampler, s->input_data, read_data);
}
#endif /* HAVE_SAMPLERATE */
*read = (int)FLOOR(s->ratio * read_samples / input_channels + .5);
if (*read < s->hop_size) {
for (i = 0; i < input_channels; i++) {
for (j = *read; j < s->hop_size; j++) {
data[i][j] = 0.;
}
}
}
}
uint_t aubio_source_sndfile_get_samplerate(aubio_source_sndfile_t * s) {
return s->samplerate;
}
uint_t aubio_source_sndfile_get_channels(aubio_source_sndfile_t * s) {
return s->input_channels;
}
uint_t aubio_source_sndfile_seek (aubio_source_sndfile_t * s, uint_t pos) {
uint_t resampled_pos = (uint_t)ROUND(pos * s->input_samplerate * 1. / s->samplerate);
return sf_seek (s->handle, resampled_pos, SEEK_SET);
}
void del_aubio_source_sndfile(aubio_source_sndfile_t * s){
if (!s) return;
if (sf_close(s->handle)) {
AUBIO_ERR("Error closing file %s: %s", s->path, sf_strerror (NULL));
}
#ifdef HAVE_SAMPLERATE
if (s->resampler != NULL) {
del_aubio_resampler(s->resampler);
}
if (s->input_data) {
del_fvec(s->input_data);
}
#endif /* HAVE_SAMPLERATE */
AUBIO_FREE(s->scratch_data);
AUBIO_FREE(s);
}
#endif /* HAVE_SNDFILE */