summaryrefslogtreecommitdiffstats
path: root/HAL-afb/HAL-interface/hal-volume.c
diff options
context:
space:
mode:
authorFulup Ar Foll <fulup@iot.bzh>2017-10-24 22:13:32 +0200
committerFulup Ar Foll <fulup@iot.bzh>2017-10-24 22:13:32 +0200
commit6498bf70a861d18b177a622091f82ab4fadf216d (patch)
tree7853d3f2203b3218b3a07b9e1723fcde86b3aa48 /HAL-afb/HAL-interface/hal-volume.c
parent2fd0fa8c77dbaaf40ba0812e43b6637ff1d1d76e (diff)
Initial working version as independent repo
Diffstat (limited to 'HAL-afb/HAL-interface/hal-volume.c')
-rw-r--r--HAL-afb/HAL-interface/hal-volume.c150
1 files changed, 0 insertions, 150 deletions
diff --git a/HAL-afb/HAL-interface/hal-volume.c b/HAL-afb/HAL-interface/hal-volume.c
deleted file mode 100644
index 997ce98..0000000
--- a/HAL-afb/HAL-interface/hal-volume.c
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
- * 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;
-}