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/*
* Copyright (C) 2016 "IoT.bzh"
* Author Fulup Ar Foll <fulup@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* references:
* alsa-util/amixer.c + alsa-lib/simple.c
* snd_tlv_convert_from_dB
* nt snd_tlv_convert_to_dB
* snd_tlv_get_dB_range
*/
#define _GNU_SOURCE // needed for vasprintf
#include <math.h>
#include "hal-interface.h"
typedef enum {
NORMALIZE_NONE = 0,
NORMALIZE_DB_LINEAR,
NORMALIZE_DB_MATH,
NORMALIZE_LINEAR,
} enumRandeModeDB_T;
// Return Value express from 0-100%
STATIC int dbNormalizeVal(enumRandeModeDB_T normaliseMode, const alsaHalDBscaleT *dbscale, int value) {
double normalized, min_norm;
// To get real DB from TLV DB values should be divided by 100
switch (normaliseMode) {
case NORMALIZE_DB_LINEAR:
normalized = ((double) (value - dbscale->min) / (double) (dbscale->max - dbscale->min));
break;
case NORMALIZE_DB_MATH:
normalized = exp10((double) (value - dbscale->max) / 6000.0);
if (dbscale->min != SND_CTL_TLV_DB_GAIN_MUTE) {
min_norm = exp10((double) (dbscale->min - dbscale->max) / 20);
normalized = (normalized - min_norm) / (1 - min_norm);
}
break;
default:
normalized = 0;
}
return (int) round(normalized * 100);
}
// HAL normalise volume values to 0-100%
PUBLIC json_object *volumeNormalise(ActionSetGetT action, const alsaHalCtlMapT *halCtls, json_object *valuesJ) {
enumRandeModeDB_T useNormalizeDB;
int length;
// If Integer look for DBscale
if (halCtls->type == SND_CTL_ELEM_TYPE_INTEGER) {
// If not valid db_scale let's use raw_scale
if (!halCtls->dbscale || (halCtls->dbscale->min >= halCtls->dbscale->max)) {
// dbscale is invalid let's try raw range
if (halCtls->minval >= halCtls->maxval) goto ExitOnError;
// Use Raw Scale Model
useNormalizeDB = NORMALIZE_LINEAR;
} else { // db_scale looks OK let's use it
if ((halCtls->dbscale->max - halCtls->dbscale->min) <= MAX_LINEAR_DB_SCALE * 100) useNormalizeDB = NORMALIZE_DB_LINEAR;
else useNormalizeDB = NORMALIZE_LINEAR; // Fulup not sure how to handle this useNormalizeDB=NORMALIZE_DB_MATH;
}
} else useNormalizeDB = NORMALIZE_NONE;
// loop on values to normalise
enum json_type jtype = json_object_get_type(valuesJ);
if (jtype == json_type_array) length = json_object_array_length(valuesJ);
else length = 1;
json_object *normalisedJ = json_object_new_array();
for (int idx = 0; idx < length; idx++) {
int value;
if (jtype == json_type_array) {
json_object *valueJ = json_object_array_get_idx(valuesJ, idx);
value = json_object_get_int(valueJ);
} else {
value = json_object_get_int(valuesJ);
}
// If Integer scale to 0/100
if (halCtls->type == SND_CTL_ELEM_TYPE_INTEGER) {
switch (action) {
case ACTION_GET:
switch (useNormalizeDB) {
case NORMALIZE_LINEAR:
value = 100 * (value - halCtls->minval) / (halCtls->maxval - halCtls->minval);
break;
case NORMALIZE_DB_MATH: //ToBeDone
value = dbNormalizeVal(useNormalizeDB, halCtls->dbscale, value);
break;
case NORMALIZE_NONE:
default:
value = value;
}
break;
case ACTION_SET:
switch (useNormalizeDB) {
case NORMALIZE_LINEAR:
value = (value * (halCtls->maxval - halCtls->minval)) / 100;
break;
case NORMALIZE_DB_MATH: //ToBeDone
value = dbNormalizeVal(useNormalizeDB, halCtls->dbscale, value);
break;
case NORMALIZE_NONE:
default:
value = value;
}
break;
default:
AFB_NOTICE("volumeNormalise: invalid action value=%d", (int) action);
goto ExitOnError;
}
}
json_object_array_add(normalisedJ, json_object_new_int(value));
}
return (normalisedJ);
ExitOnError:
return NULL;
}
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