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-rw-r--r--libaf/af_stats.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/libaf/af_stats.c b/libaf/af_stats.c
new file mode 100644
index 0000000000..3d78f72faa
--- /dev/null
+++ b/libaf/af_stats.c
@@ -0,0 +1,159 @@
+/*
+ * 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
+};