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/**
* @file vumeter.c VU-meter
*
* Copyright (C) 2010 Creytiv.com
*/
#include <string.h>
#include <stdlib.h>
#include <re.h>
#include <baresip.h>
/**
* @defgroup vumeter vumeter
*
* Simple ASCII VU-meter for the audio-signal.
*
* The Volume unit (VU) meter module takes the audio-signal as input
* and prints a simple ASCII-art bar for the recording and playback levels.
* It is using the aufilt API to get the audio samples.
*/
struct vumeter_enc {
struct aufilt_enc_st af; /* inheritance */
struct tmr tmr;
double avg_rec;
volatile bool started;
};
struct vumeter_dec {
struct aufilt_dec_st af; /* inheritance */
struct tmr tmr;
double avg_play;
volatile bool started;
};
static void enc_destructor(void *arg)
{
struct vumeter_enc *st = arg;
list_unlink(&st->af.le);
tmr_cancel(&st->tmr);
}
static void dec_destructor(void *arg)
{
struct vumeter_dec *st = arg;
list_unlink(&st->af.le);
tmr_cancel(&st->tmr);
}
static int audio_print_vu(struct re_printf *pf, double *level)
{
char buf[16];
size_t res;
double x;
x = (*level + -AULEVEL_MIN) / -AULEVEL_MIN;
res = min(sizeof(buf) * x,
sizeof(buf)-1);
memset(buf, '=', res);
buf[res] = '\0';
return re_hprintf(pf, "[%-16s]", buf);
}
static void print_vumeter(int pos, int color, double value)
{
/* move cursor to a fixed position */
re_fprintf(stderr, "\x1b[%dG", pos);
/* print VU-meter in Nice colors */
re_fprintf(stderr, " \x1b[%dm%H\x1b[;m\r",
color, audio_print_vu, &value);
}
static void enc_tmr_handler(void *arg)
{
struct vumeter_enc *st = arg;
tmr_start(&st->tmr, 100, enc_tmr_handler, st);
if (st->started)
print_vumeter(60, 31, st->avg_rec);
}
static void dec_tmr_handler(void *arg)
{
struct vumeter_dec *st = arg;
tmr_start(&st->tmr, 100, dec_tmr_handler, st);
if (st->started)
print_vumeter(80, 32, st->avg_play);
}
static int encode_update(struct aufilt_enc_st **stp, void **ctx,
const struct aufilt *af, struct aufilt_prm *prm)
{
struct vumeter_enc *st;
(void)ctx;
(void)prm;
if (!stp || !af)
return EINVAL;
if (*stp)
return 0;
st = mem_zalloc(sizeof(*st), enc_destructor);
if (!st)
return ENOMEM;
tmr_start(&st->tmr, 100, enc_tmr_handler, st);
*stp = (struct aufilt_enc_st *)st;
return 0;
}
static int decode_update(struct aufilt_dec_st **stp, void **ctx,
const struct aufilt *af, struct aufilt_prm *prm)
{
struct vumeter_dec *st;
(void)ctx;
(void)prm;
if (!stp || !af)
return EINVAL;
if (*stp)
return 0;
st = mem_zalloc(sizeof(*st), dec_destructor);
if (!st)
return ENOMEM;
tmr_start(&st->tmr, 100, dec_tmr_handler, st);
*stp = (struct aufilt_dec_st *)st;
return 0;
}
static int encode(struct aufilt_enc_st *st, int16_t *sampv, size_t *sampc)
{
struct vumeter_enc *vu = (void *)st;
vu->avg_rec = aulevel_calc_dbov(sampv, *sampc);
vu->started = true;
return 0;
}
static int decode(struct aufilt_dec_st *st, int16_t *sampv, size_t *sampc)
{
struct vumeter_dec *vu = (void *)st;
vu->avg_play = aulevel_calc_dbov(sampv, *sampc);
vu->started = true;
return 0;
}
static struct aufilt vumeter = {
LE_INIT, "vumeter", encode_update, encode, decode_update, decode
};
static int module_init(void)
{
aufilt_register(baresip_aufiltl(), &vumeter);
return 0;
}
static int module_close(void)
{
aufilt_unregister(&vumeter);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(vumeter) = {
"vumeter",
"filter",
module_init,
module_close
};
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