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/*
* Copyright (C) 2009 Nicolas George <nicolas.george@normalesup.org>
*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <math.h>
#include "af.h"
#define MAX_DB 80
#define MIN_VAL 1E-8
struct af_stats {
long long n_samples;
double tsquare;
int max;
long long histogram[65536];
};
static inline int logdb(double v)
{
if (v > 1)
return 0;
if (v <= MIN_VAL)
return MAX_DB - 1;
return log(v) / -0.23025850929940456840179914546843642076;
}
static int stats_init(af_instance_t *af, struct af_stats *s, af_data_t *data)
{
int i;
if (!data)
return AF_ERROR;
*(af->data) = *data;
af->data->format = AF_FORMAT_S16_NE;
af->data->bps = 2;
s->n_samples = 0;
s->tsquare = 0;
s->max = 0;
for (i = 0; i < 65536; i++)
s->histogram[i] = 0;
return af_test_output(af, data);
}
static void stats_print(struct af_stats *s)
{
int i;
long long sum;
float v;
long long h[MAX_DB];
s->tsquare /= 32768 * 32768;
mp_msg(MSGT_AFILTER, MSGL_INFO, "stats: n_samples: %lld\n", s->n_samples);
if (s->n_samples == 0)
return;
mp_msg(MSGT_AFILTER, MSGL_INFO, "stats: mean_volume: -%d dB\n",
logdb(s->tsquare / s->n_samples));
mp_msg(MSGT_AFILTER, MSGL_INFO, "stats: max_volume: -%d dB\n",
logdb(s->max / (32768.0 * 32768.0)));
for (i = 0; i < MAX_DB; i++)
h[i] = 0;
for (i = 0; i < 65536; i++) {
v = (i - 32768) / 32768.0;
h[logdb(v * v)] += s->histogram[i];
}
for (i = 0; i < MAX_DB; i++)
if (h[i] != 0)
break;
sum = 0;
for (; i < MAX_DB; i++) {
sum += h[i];
mp_msg(MSGT_AFILTER, MSGL_INFO, "stats: histogram_%ddb: %lld\n",
i, h[i]);
if (sum > s->n_samples / 1000)
break;
}
}
static int control(struct af_instance_s *af, int cmd, void *arg)
{
struct af_stats *s = af->setup;
switch(cmd) {
case AF_CONTROL_REINIT:
return stats_init(af, s, arg);
case AF_CONTROL_PRE_DESTROY:
stats_print(s);
return AF_OK;
}
return AF_UNKNOWN;
}
static void uninit(struct af_instance_s *af)
{
free(af->data);
free(af->setup);
}
static af_data_t *play(struct af_instance_s *af, af_data_t *data)
{
struct af_stats *s = af->setup;
int16_t *a, *aend;
int v, v2;
a = data->audio;
aend = (int16_t *)((char *)data->audio + data->len);
s->n_samples += aend - a;
for (; a < aend; a++) {
v = *a;
v2 = v * v;
s->tsquare += v2;
s->histogram[v + 32768]++;
if (v2 > s->max)
s->max = v2;
}
return data;
}
static int af_open(af_instance_t *af)
{
af->control = control;
af->uninit = uninit;
af->play = play;
af->mul = 1;
af->data = malloc(sizeof(af_data_t));
af->setup = malloc(sizeof(struct af_stats));
if (af->data == NULL || af->setup == NULL)
return AF_ERROR;
return AF_OK;
}
af_info_t af_info_stats = {
"Statistics audio filter",
"stats",
"Nicolas George",
"",
0,
af_open
};
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