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/*
* Copyright (C) 2018 "IoT.bzh"
* Author Jonathan Aillet <jonathan.aillet@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.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <limits.h>
#include <math.h>
#include <wrap-json.h>
#include "4a-hal-controllers-value-handler.h"
#include "4a-hal-controllers-alsacore-link.h"
/*******************************************************************************
* Simple conversion value to/from percentage functions *
******************************************************************************/
int HalCtlsConvertValueToPercentage(double val, double min, double max)
{
double range;
range = max - min;
if(range <= 0)
return -INT_MAX;
val -= min;
return (int) round(val / range * 100);
}
int HalCtlsConvertPercentageToValue(int percentage, int min, int max)
{
int range;
range = max - min;
if(range <= 0)
return -INT_MAX;
return (int) round((double) percentage * (double) range * 0.01 + (double) min);
}
/*******************************************************************************
* Convert json object from percentage to value *
******************************************************************************/
int HalCtlsNormalizeJsonValues(AFB_ApiT apiHandle, struct CtlHalAlsaCtlProperties *alsaCtlProperties, json_object *toConvertJ, json_object **ConvertedJ)
{
int err = 0, idx, count, initialValue, convertedValue;
json_object *toConvertObjectJ, *convertedValueJ, *convertedArrayJ;
switch(json_object_get_type(toConvertJ)) {
case json_type_array:
count = json_object_array_length(toConvertJ);
break;
case json_type_null:
case json_type_object:
count = 0;
AFB_ApiWarning(apiHandle, "%s: can't normalize json values :\n-- %s", __func__, json_object_get_string(toConvertJ));
*ConvertedJ = json_object_get(toConvertJ);
return -1;
default:
count = 1;
break;
}
convertedArrayJ = json_object_new_array();
for(idx = 0; idx < count; idx++) {
if(count > 1)
toConvertObjectJ = json_object_array_get_idx(toConvertJ, idx);
else
toConvertObjectJ = toConvertJ;
switch(alsaCtlProperties->type) {
case SND_CTL_ELEM_TYPE_INTEGER:
case SND_CTL_ELEM_TYPE_INTEGER64:
if(! json_object_is_type(toConvertObjectJ, json_type_int)) {
err += -10*idx;
AFB_ApiWarning(apiHandle,
"%s: Try normalize an integer control but value sent in json is not an integer : '%s'",
__func__,
json_object_get_string(toConvertObjectJ));
convertedValueJ = toConvertObjectJ;
break;
}
initialValue = json_object_get_int(toConvertObjectJ);
convertedValue = HalCtlsConvertPercentageToValue(initialValue, alsaCtlProperties->minval, alsaCtlProperties->maxval);
if(convertedValue == -INT_MAX) {
AFB_ApiWarning(apiHandle,
"%s: Can't normalize %i (using min %i et max %i), value set to 0",
__func__,
initialValue,
alsaCtlProperties->minval,
alsaCtlProperties->maxval);
convertedValue = 0;
}
if(alsaCtlProperties->step) {
// Round value to the nearest step
convertedValue = (int) round((double) convertedValue / (double) alsaCtlProperties->step);
convertedValue *= alsaCtlProperties->step;
}
convertedValueJ = json_object_new_int(convertedValue);
break;
case SND_CTL_ELEM_TYPE_BOOLEAN:
if(! (json_object_is_type(toConvertObjectJ, json_type_int) ||
json_object_is_type(toConvertObjectJ, json_type_boolean))) {
err += -1000*idx;
AFB_ApiWarning(apiHandle,
"%s: Try normalize a boolean control but value sent in json is not a boolean/integer : '%s'",
__func__,
json_object_get_string(toConvertObjectJ));
convertedValueJ = toConvertObjectJ;
break;
}
initialValue = json_object_get_int(toConvertObjectJ);
convertedValueJ = json_object_new_int(initialValue ? 1 : 0);
break;
default:
AFB_ApiWarning(apiHandle,
"%s: Normalization not handle for the alsa control type %i, sending back the object as it was '%s'",
__func__,
(int) alsaCtlProperties->type,
json_object_get_string(toConvertJ));
convertedValueJ = toConvertObjectJ;
break;
}
json_object_array_put_idx(convertedArrayJ, idx, convertedValueJ);
}
*ConvertedJ = convertedArrayJ;
return 0;
}
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