ref: 1d48e533e1c6de212ad1520ed6481b222727e7a6
dir: /src/noiseprof.c/
/* noiseprof - SoX Noise Profiling Effect.
*
* Written by Ian Turner (vectro@vectro.org)
* Copyright 1999 Ian Turner and others
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library 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 Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "noisered.h"
#include <assert.h>
#include <string.h>
#include <errno.h>
typedef struct {
float *sum;
int *profilecount;
float *window;
} chandata_t;
typedef struct {
char* output_filename;
FILE* output_file;
chandata_t *chandata;
size_t bufdata;
} priv_t;
/*
* Get the filename, if any. We don't open it until sox_noiseprof_start.
*/
static int sox_noiseprof_getopts(sox_effect_t * effp, int argc, char **argv)
{
priv_t * data = (priv_t *) effp->priv;
--argc, ++argv;
if (argc == 1) {
data->output_filename = argv[0];
} else if (argc > 1)
return lsx_usage(effp);
return (SOX_SUCCESS);
}
/*
* Prepare processing.
* Do all initializations.
*/
static int sox_noiseprof_start(sox_effect_t * effp)
{
priv_t * data = (priv_t *) effp->priv;
unsigned channels = effp->in_signal.channels;
unsigned i;
/* Note: don't fall back to stderr if stdout is unavailable
* since we already use stderr for diagnostics. */
if (!data->output_filename || !strcmp(data->output_filename, "-")) {
if (effp->global_info->global_info->stdout_in_use_by) {
lsx_fail("stdout already in use by `%s'", effp->global_info->global_info->stdout_in_use_by);
return SOX_EOF;
}
effp->global_info->global_info->stdout_in_use_by = effp->handler.name;
data->output_file = stdout;
}
else if ((data->output_file = fopen(data->output_filename, "wb")) == NULL) {
lsx_fail("Couldn't open profile file %s: %s", data->output_filename, strerror(errno));
return SOX_EOF;
}
data->chandata = lsx_calloc(channels, sizeof(*(data->chandata)));
data->bufdata = 0;
for (i = 0; i < channels; i ++) {
data->chandata[i].sum = lsx_calloc(FREQCOUNT, sizeof(float));
data->chandata[i].profilecount = lsx_calloc(FREQCOUNT, sizeof(int));
data->chandata[i].window = lsx_calloc(WINDOWSIZE, sizeof(float));
}
return SOX_SUCCESS;
}
/* Collect statistics from the complete window on channel chan. */
static void collect_data(chandata_t* chan) {
float *out = lsx_calloc(FREQCOUNT, sizeof(float));
int i;
lsx_power_spectrum_f(WINDOWSIZE, chan->window, out);
for (i = 0; i < FREQCOUNT; i ++) {
if (out[i] > 0) {
float value = log(out[i]);
chan->sum[i] += value;
chan->profilecount[i] ++;
}
}
free(out);
}
/*
* Grab what we can from ibuf, and process if we have a whole window.
*/
static int sox_noiseprof_flow(sox_effect_t * effp, const sox_sample_t *ibuf, sox_sample_t *obuf,
size_t *isamp, size_t *osamp)
{
priv_t * p = (priv_t *) effp->priv;
size_t samp = min(*isamp, *osamp), dummy = 0; /* No need to clip count */
size_t chans = effp->in_signal.channels;
size_t i, j, n = min(samp / chans, WINDOWSIZE - p->bufdata);
memcpy(obuf, ibuf, n * chans * sizeof(*obuf)); /* Pass on audio unaffected */
*isamp = *osamp = n * chans;
/* Collect data for every channel. */
for (i = 0; i < chans; i ++) {
SOX_SAMPLE_LOCALS;
chandata_t * chan = &(p->chandata[i]);
for (j = 0; j < n; j ++)
chan->window[j + p->bufdata] =
SOX_SAMPLE_TO_FLOAT_32BIT(ibuf[i + j * chans], dummy);
if (n + p->bufdata == WINDOWSIZE)
collect_data(chan);
}
p->bufdata += n;
assert(p->bufdata <= WINDOWSIZE);
if (p->bufdata == WINDOWSIZE)
p->bufdata = 0;
return SOX_SUCCESS;
}
/*
* Finish off the last window.
*/
static int sox_noiseprof_drain(sox_effect_t * effp, sox_sample_t *obuf UNUSED, size_t *osamp)
{
priv_t * data = (priv_t *) effp->priv;
int tracks = effp->in_signal.channels;
int i;
*osamp = 0;
if (data->bufdata == 0) {
return SOX_EOF;
}
for (i = 0; i < tracks; i ++) {
int j;
for (j = data->bufdata+1; j < WINDOWSIZE; j ++) {
data->chandata[i].window[j] = 0;
}
collect_data(&(data->chandata[i]));
}
if (data->bufdata == WINDOWSIZE || data->bufdata == 0)
return SOX_EOF;
else
return SOX_SUCCESS;
}
/*
* Print profile and clean up.
*/
static int sox_noiseprof_stop(sox_effect_t * effp)
{
priv_t * data = (priv_t *) effp->priv;
size_t i;
for (i = 0; i < effp->in_signal.channels; i ++) {
int j;
chandata_t* chan = &(data->chandata[i]);
fprintf(data->output_file, "Channel %lu: ", (unsigned long)i);
for (j = 0; j < FREQCOUNT; j ++) {
double r = chan->profilecount[j] != 0 ?
chan->sum[j] / chan->profilecount[j] : 0;
fprintf(data->output_file, "%s%f", j == 0 ? "" : ", ", r);
}
fprintf(data->output_file, "\n");
free(chan->sum);
free(chan->profilecount);
}
free(data->chandata);
if (data->output_file != stdout)
fclose(data->output_file);
return (SOX_SUCCESS);
}
static sox_effect_handler_t sox_noiseprof_effect = {
"noiseprof",
"[profile-file]",
SOX_EFF_MCHAN | SOX_EFF_MODIFY,
sox_noiseprof_getopts,
sox_noiseprof_start,
sox_noiseprof_flow,
sox_noiseprof_drain,
sox_noiseprof_stop,
NULL, sizeof(priv_t)
};
const sox_effect_handler_t *lsx_noiseprof_effect_fn(void)
{
return &sox_noiseprof_effect;
}