meta-agl-profile-cluster/LICENSE.MIT


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Note:
Individual files contain the following tag instead of the full license text.

    SPDX-License-Identifier: MIT

This enables machine processing of license information based on the SPDX
License Identifiers that are here available: http://spdx.org/licenses/
/*
 * AlsaLibMapping -- provide low level interface with ALSA lib (extracted from alsa-json-gateway code)
 * Copyright (C) 2015,2016,2017, 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:
   https://github.com/fulup-bzh/AlsaJsonGateway (original code)
   http://alsa-lib.sourcearchive.com/documentation/1.0.20/modules.html
   http://alsa-lib.sourcearchive.com/documentation/1.0.8/group__Control_gd48d44da8e3bfe150e928267008b8ff5.html
   http://alsa.opensrc.org/HowTo_access_a_mixer_control
   https://github.com/gch1p/alsa-volume-monitor/blob/master/main.c
   https://github.com/DongheonKim/android_hardware_alsa-sound/blob/master/ALSAControl.cpp (ALSA low level API)
   https://www.kernel.org/doc/html/v4.11/sound/index.html

 */

#define _GNU_SOURCE  // needed for vasprintf
#include "Alsa-ApiHat.h"

PUBLIC void NumidsListParse(ActionSetGetT action, queryValuesT *queryValues, ctlRequestT *ctlRequest) {
    int length;

    for (int idx = 0; idx < queryValues->count; idx++) {
        json_object *jId, *valuesJ;
        ctlRequest[idx].used = 0;
        ctlRequest[idx].valuesJ = NULL;

        // when only one NUMID is provided it might not be encapsulated in a JSON array
        if (json_type_array == json_object_get_type(queryValues->numidsJ)) ctlRequest[idx].jToken = json_object_array_get_idx(queryValues->numidsJ, idx);
        else ctlRequest[idx].jToken = queryValues->numidsJ;

        enum json_type jtype = json_object_get_type(ctlRequest[idx].jToken);
        switch (jtype) {

            case json_type_int:
                // if NUMID is not an array then it should be an integer numid with no value
                ctlRequest[idx].numId = json_object_get_int(ctlRequest[idx].jToken);

                // Special SET simple short numid form [numid, [VAL1...VALX]]
                if (action == ACTION_SET && queryValues->count == 2) {
                    ctlRequest[idx].valuesJ = json_object_array_get_idx(queryValues->numidsJ, 1);
                    queryValues->count = 1; //In this form count==2 , when only one numid is to set
                    idx++;
                    continue;
                } else
                    break;

            case json_type_array:
                // NUMID is an array 1st slot should be numid, optionally values may come after
                length = json_object_array_length(ctlRequest[idx].jToken);

                // numid must be in 1st slot of numid json array
                ctlRequest[idx].numId = json_object_get_int(json_object_array_get_idx(ctlRequest[idx].jToken, 0));
                if (action == ACTION_GET) continue;

                // In Write mode second value should be the value
                if (action == ACTION_SET && length == 2) {
                    ctlRequest[idx].valuesJ = json_object_array_get_idx(ctlRequest[idx].jToken, 1);
                    continue;
                }

                // no numid value
                ctlRequest[idx].used = -1;
                break;

            case json_type_object:
                // numid+values formated as {id:xxx, val:[aa,bb...,nn]}
                if (!json_object_object_get_ex(ctlRequest[idx].jToken, "id", &jId) || !json_object_object_get_ex(ctlRequest[idx].jToken, "val", &valuesJ)) {
                    AFB_NOTICE("Invalid Json=%s missing 'id'|'val'", json_object_get_string(ctlRequest[idx].jToken));
                    ctlRequest[idx].used = -1;
                } else {
                    ctlRequest[idx].numId = json_object_get_int(jId);
                    if (action == ACTION_SET) ctlRequest[idx].valuesJ = valuesJ;
                }
                break;

            default:
                ctlRequest[idx].used = -1;
        }
    }
}

STATIC json_object *DB2StringJsonOject(long dB) {
    char label [20];
    if (dB < 0) {
        snprintf(label, sizeof (label), "-%li.%02lidB", -dB / 100, -dB % 100);
    } else {
        snprintf(label, sizeof (label), "%li.%02lidB", dB / 100, dB % 100);
    }

    // json function takes care of string copy
    return (json_object_new_string(label));
}


// Direct port from amixer TLV decode routine. This code is too complex for me.
// I hopefully did not break it when porting it.

STATIC json_object *decodeTlv(unsigned int *tlv, unsigned int tlv_size, int mode) {
    char label[20];
    unsigned int type = tlv[0];
    unsigned int size;
    unsigned int idx = 0;
    const char *chmap_type = NULL;
    json_object * decodeTlvJson = json_object_new_object();

    if (tlv_size < (unsigned int) (2 * sizeof (unsigned int))) {
        printf("TLV size error!\n");
        return NULL;
    }
    type = tlv[idx++];
    size = tlv[idx++];
    tlv_size -= (unsigned int) (2 * sizeof (unsigned int));
    if (size > tlv_size) {
        fprintf(stderr, "TLV size error (%i, %i, %i)!\n", type, size, tlv_size);
        return NULL;
    }
    switch (type) {

        case SND_CTL_TLVT_CONTAINER:
        {
            json_object * containerJson = json_object_new_array();

            size += (unsigned int) (sizeof (unsigned int) - 1);
            size /= (unsigned int) (sizeof (unsigned int));
            while (idx < size) {
                json_object *embedJson;

                if (tlv[idx + 1] > (size - idx) * sizeof (unsigned int)) {
                    fprintf(stderr, "TLV size error in compound!\n");
                    return NULL;
                }
                embedJson = decodeTlv(tlv + idx, tlv[idx + 1] + 8, mode);
                json_object_array_add(containerJson, embedJson);
                idx += (unsigned int) (2 + (tlv[idx + 1] + sizeof (unsigned int) - 1) / sizeof (unsigned int));
            }
            json_object_object_add(decodeTlvJson, "container", containerJson);
            break;
        }

        case SND_CTL_TLVT_DB_SCALE:
        {
            json_object * dbscaleJson = json_object_new_object();

            if (size != 2 * sizeof (unsigned int)) {
                json_object * arrayJson = json_object_new_array();
                while (size > 0) {
                    if (mode >= QUERY_VERBOSE) {
                        snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
                        json_object_array_add(arrayJson, json_object_new_string(label));
                    } else {
                        json_object_array_add(arrayJson, json_object_new_int(tlv[idx++]));
                    }
                    size -= (unsigned int) sizeof (unsigned int);
                }
                json_object_object_add(dbscaleJson, "array", arrayJson);
            } else {
                if (mode >= QUERY_VERBOSE) {
                    json_object_object_add(dbscaleJson, "min", DB2StringJsonOject((int) tlv[2]));
                    json_object_object_add(dbscaleJson, "step", DB2StringJsonOject(tlv[3] & 0xffff));
                    json_object_object_add(dbscaleJson, "mute", DB2StringJsonOject((tlv[3] >> 16) & 1));
                } else {
                    json_object_object_add(dbscaleJson, "min", json_object_new_int((int) tlv[2]));
                    json_object_object_add(dbscaleJson, "step", json_object_new_int(tlv[3] & 0xffff));
                    json_object_object_add(dbscaleJson, "mute", json_object_new_int((tlv[3] >> 16) & 1));
                }
            }
            json_object_object_add(decodeTlvJson, "dbscale", dbscaleJson);
            break;
        }

#ifdef SND_CTL_TLVT_DB_LINEAR
        case SND_CTL_TLVT_DB_LINEAR:
        {
            json_object * dbLinearJson = json_object_new_object();

            if (size != 2 * sizeof (unsigned int)) {
                json_object * arrayJson = json_object_new_array();
                while (size > 0) {
                    if (mode >= QUERY_VERBOSE) {
                        snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
                        json_object_array_add(arrayJson, json_object_new_string(label));
                    } else {
                        json_object_array_add(arrayJson, json_object_new_int(tlv[idx++]));
                    }
                    size -= (unsigned int) sizeof (unsigned int);
                }
                json_object_object_add(dbLinearJson, "offset", arrayJson);
            } else {
                if (mode >= QUERY_VERBOSE) {
                    json_object_object_add(dbLinearJson, "min", DB2StringJsonOject((int) tlv[2]));
                    json_object_object_add(dbLinearJson, "max", DB2StringJsonOject((int) tlv[3]));
                } else {
                    json_object_object_add(dbLinearJson, "min", json_object_new_int((int) tlv[2]));
                    json_object_object_add(dbLinearJson, "max", json_object_new_int((int) tlv[3]));
                }
            }
            json_object_object_add(decodeTlvJson, "dblinear", dbLinearJson);
            break;
        }
#endif

#ifdef SND_CTL_TLVT_DB_RANGE
        case SND_CTL_TLVT_DB_RANGE:
        {
            json_object *dbRangeJson = json_object_new_object();

            if ((size % (6 * sizeof (unsigned int))) != 0) {
                json_object *arrayJson = json_object_new_array();
                while (size > 0) {
                    if (mode >= QUERY_VERBOSE) {
                        snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
                        json_object_array_add(arrayJson, json_object_new_string(label));
                    } else {
                        json_object_array_add(arrayJson, json_object_new_int(tlv[idx++]));
                    }
                    size -= (unsigned int) sizeof (unsigned int);
                }
                json_object_object_add(dbRangeJson, "dbrange", arrayJson);
                break;
            }
            while (size > 0) {
                json_object * embedJson = json_object_new_object();
                json_object_object_add(embedJson, "rangemin", json_object_new_int(tlv[idx++]));
                json_object_object_add(embedJson, "rangemax", json_object_new_int(tlv[idx++]));
                embedJson = decodeTlv(tlv + idx, 4 * sizeof (unsigned int), mode);
                json_object_object_add(embedJson, "tlv", embedJson);
                idx += 4;
                size -= (unsigned int) (6 * sizeof (unsigned int));
                json_object_array_add(dbRangeJson, embedJson);
            }
            json_object_object_add(decodeTlvJson, "dbrange", dbRangeJson);
            break;
        }
#endif
#ifdef SND_CTL_TLVT_DB_MINMAX
        case SND_CTL_TLVT_DB_MINMAX:
        case SND_CTL_TLVT_DB_MINMAX_MUTE:
        {
            json_object * dbMinMaxJson = json_object_new_object();

            if (size != 2 * sizeof (unsigned int)) {
                json_object * arrayJson = json_object_new_array();
                while (size > 0) {
                    if (mode >= QUERY_VERBOSE) {
                        snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
                        json_object_array_add(arrayJson, json_object_new_string(label));
                    } else {
                        json_object_array_add(arrayJson, json_object_new_int(tlv[idx++]));
                    }
                    size -= (unsigned int) sizeof (unsigned int);
                }
                json_object_object_add(dbMinMaxJson, "array", arrayJson);

            } else {
                if (mode >= QUERY_VERBOSE) {
                    json_object_object_add(dbMinMaxJson, "min", DB2StringJsonOject((int) tlv[2]));
                    json_object_object_add(dbMinMaxJson, "max", DB2StringJsonOject((int) tlv[3]));
                } else {
                    json_object_object_add(dbMinMaxJson, "min", json_object_new_int((int) tlv[2]));
                    json_object_object_add(dbMinMaxJson, "max", json_object_new_int((int) tlv[3]));
                }
            }

            if (type == SND_CTL_TLVT_DB_MINMAX_MUTE) {
                json_object_object_add(decodeTlvJson, "dbminmaxmute", dbMinMaxJson);
            } else {
                json_object_object_add(decodeTlvJson, "dbminmax", dbMinMaxJson);
            }
            break;
        }
#endif
#ifdef SND_CTL_TLVT_CHMAP_FIXED
        case SND_CTL_TLVT_CHMAP_FIXED:
            chmap_type = "fixed";
            /* Fall through */
        case SND_CTL_TLVT_CHMAP_VAR:
            if (!chmap_type)
                chmap_type = "variable";
            /* Fall through */
        case SND_CTL_TLVT_CHMAP_PAIRED:
            if (!chmap_type)
                chmap_type = "paired";

            json_object * chmapJson = json_object_new_object();
            json_object * arrayJson = json_object_new_array();

            while (size > 0) {
                snprintf(label, sizeof (label), "%s", snd_pcm_chmap_name(tlv[idx++]));
                size -= (unsigned int) sizeof (unsigned int);
                json_object_array_add(arrayJson, json_object_new_string(label));
            }
            json_object_object_add(chmapJson, chmap_type, arrayJson);
            json_object_object_add(decodeTlvJson, "chmap", chmapJson);
            break;
#endif
        default:
        {
            printf("unk-%i-", type);
            json_object * arrayJson = json_object_new_array();

            while (size > 0) {
                snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
                size -= (unsigned int) sizeof (unsigned int);
                json_object_array_add(arrayJson, json_object_new_string(label));
            }
            break;
            json_object_object_add(decodeTlvJson, "unknown", arrayJson);
        }
    }

    return (decodeTlvJson);
}


// retreive info for one given card

STATIC json_object* alsaCardProbe(const char *rqtSndId) {
    const char *info, *name;
    const char *devid, *driver;
    json_object *ctlDev;
    snd_ctl_t *handle;
    snd_ctl_card_info_t *cardinfo;
    int err;

    if ((err = snd_ctl_open(&handle, rqtSndId, 0)) < 0) {
        AFB_INFO("alsaCardProbe '%s' Not Found", rqtSndId);
        return NULL;
    }

    snd_ctl_card_info_alloca(&cardinfo);
    if ((err = snd_ctl_card_info(handle, cardinfo)) < 0) {
        snd_ctl_close(handle);
        AFB_WARNING("SndCard '%s' info error: %s", rqtSndId, snd_strerror(err));
        return NULL;
    }

    // start a new json object to store card info
    ctlDev = json_object_new_object();

    devid = snd_ctl_card_info_get_id(cardinfo);
    json_object_object_add(ctlDev, "devid", json_object_new_string(devid));
    name = snd_ctl_card_info_get_name(cardinfo);
    json_object_object_add(ctlDev, "name", json_object_new_string(name));

    if (AFB_GET_VERBOSITY > 1) {
        json_object_object_add(ctlDev, "devid", json_object_new_string(rqtSndId));
        driver = snd_ctl_card_info_get_driver(cardinfo);
        json_object_object_add(ctlDev, "driver", json_object_new_string(driver));
        info = strdup(snd_ctl_card_info_get_longname(cardinfo));
        json_object_object_add(ctlDev, "info", json_object_new_string(info));
        AFB_INFO("AJG: Soundcard Devid=%-5s devid=%-7s Name=%s\n", rqtSndId, devid, info);
    }

    // free card handle and return info
    snd_ctl_close(handle);
    return (ctlDev);
}

// Loop on every potential Sound card and register active one

PUBLIC void alsaGetInfo(afb_req request) {
    int card;
    json_object *ctlDev, *ctlDevs;
    char devid[32];

    const char *rqtSndId = afb_req_value(request, "devid");

    // if no specific card requested loop on all

    if (rqtSndId != NULL) {
        // only one card was requested let's probe it
        ctlDev = alsaCardProbe(rqtSndId);
        if (ctlDev != NULL) afb_req_success(request, ctlDev, NULL);
        else afb_req_fail_f(request, "sndscard-notfound", "SndCard '%s' Not Found", rqtSndId);

    } else {
        // return an array of ctlDev
        ctlDevs = json_object_new_array();

        // loop on potential card number
        for (card = 0; card < MAX_SND_CARD; card++) {

            // build card devid and probe it
            snprintf(devid, sizeof (devid), "hw:%i", card);
            ctlDev = alsaCardProbe(devid);

            // Alsa has hole within card list [ignore them]
            if (ctlDev != NULL) {
                // add current ctlDev to ctlDevs object
                json_object_array_add(ctlDevs, ctlDev);
            }
        }
        afb_req_success(request, ctlDevs, NULL);
    }
}

// pack Alsa element's ACL into a JSON object

STATIC json_object *getControlAcl(snd_ctl_elem_info_t *info) {

    json_object * jsonAclCtl = json_object_new_object();

    json_object_object_add(jsonAclCtl, "read", json_object_new_boolean(snd_ctl_elem_info_is_readable(info)));
    json_object_object_add(jsonAclCtl, "write", json_object_new_boolean(snd_ctl_elem_info_is_writable(info)));
    json_object_object_add(jsonAclCtl, "inact", json_object_new_boolean(snd_ctl_elem_info_is_inactive(info)));
    json_object_object_add(jsonAclCtl, "volat", json_object_new_boolean(snd_ctl_elem_info_is_volatile(info)));
    json_object_object_add(jsonAclCtl, "lock", json_object_new_boolean(snd_ctl_elem_info_is_locked(info)));

    // if TLV is readable we insert its ACL
    if (!snd_ctl_elem_info_is_tlv_readable(info)) {
        json_object * jsonTlv = json_object_new_object();

        json_object_object_add(jsonTlv, "read", json_object_new_boolean(snd_ctl_elem_info_is_tlv_readable(info)));
        json_object_object_add(jsonTlv, "write", json_object_new_boolean(snd_ctl_elem_info_is_tlv_writable(info)));
        json_object_object_add(jsonTlv, "command", json_object_new_boolean(snd_ctl_elem_info_is_tlv_commandable(info)));

        json_object_object_add(jsonAclCtl, "tlv", jsonTlv);
    }
    return (jsonAclCtl);
}

// process ALSA control and store resulting value into ctlRequest

PUBLIC int alsaSetSingleCtl(snd_ctl_t *ctlDev, snd_ctl_elem_id_t *elemId, ctlRequestT *ctlRequest) {
    snd_ctl_elem_value_t *elemData;
    snd_ctl_elem_info_t *elemInfo;
    int count, length, err, valueIsArray = 0;

    // let's make sure we are processing the right control
    if (ctlRequest->numId != snd_ctl_elem_id_get_numid(elemId)) goto OnErrorExit;

    // set info event ID and get value
    snd_ctl_elem_info_alloca(&elemInfo);
    snd_ctl_elem_info_set_id(elemInfo, elemId); // map ctlInfo to ctlId elemInfo is updated !!!
    if (snd_ctl_elem_info(ctlDev, elemInfo) < 0) {
        AFB_NOTICE("Fail to load ALSA NUMID=%d Values='%s'", ctlRequest->numId, json_object_get_string(ctlRequest->valuesJ));
        goto OnErrorExit;
    }

    if (!snd_ctl_elem_info_is_writable(elemInfo)) {
        AFB_NOTICE("Not Writable ALSA NUMID=%d Values='%s'", ctlRequest->numId, json_object_get_string(ctlRequest->valuesJ));
        goto OnErrorExit;
    }

    count = snd_ctl_elem_info_get_count(elemInfo);
    if (count == 0) goto OnErrorExit;

    enum json_type jtype = json_object_get_type(ctlRequest->valuesJ);
    switch (jtype) {
        case json_type_array:
            length = json_object_array_length(ctlRequest->valuesJ);
            valueIsArray = 1;
            break;
        case json_type_int:
            length = 1;
            valueIsArray = 0;
            break;
        default:
            length = 0;
            break;
    }


    if (length == 0) {
        AFB_NOTICE("Invalid values NUMID='%d' Values='%s' count='%d' wanted='%d'", ctlRequest->numId, json_object_get_string(ctlRequest->valuesJ), length, count);
        goto OnErrorExit;
    }

    snd_ctl_elem_value_alloca(&elemData);
    snd_ctl_elem_value_set_id(elemData, elemId); // map ctlInfo to ctlId elemInfo is updated !!!
    if (snd_ctl_elem_read(ctlDev, elemData) < 0) goto OnErrorExit;

    // Loop on every control value and push to sndcard
    for (int index = 0; index < count; index++) {
        json_object *element;
        int value;

        // when not enough value duplicate last provided one
        if (!valueIsArray) element = ctlRequest->valuesJ;
        else {
            if (index < length) element = json_object_array_get_idx(ctlRequest->valuesJ, index);
            else element = json_object_array_get_idx(ctlRequest->valuesJ, length - 1);
        }

        value = json_object_get_int(element);
        snd_ctl_elem_value_set_integer(elemData, index, value);
    }

    err = snd_ctl_elem_write(ctlDev, elemData);
    if (err < 0) {
        AFB_NOTICE("Fail to write ALSA NUMID=%d Values='%s' Error=%s", ctlRequest->numId, json_object_get_string(ctlRequest->valuesJ), snd_strerror(err));
        goto OnErrorExit;
    }

    ctlRequest->used = 1;
    return 0;

OnErrorExit:
    ctlRequest->used = -1;
    return -1;
}

// process ALSA control and store then into ctlRequest

PUBLIC int alsaGetSingleCtl(snd_ctl_t *ctlDev, snd_ctl_elem_id_t *elemId, ctlRequestT *ctlRequest, halQueryMode queryMode) {
    snd_ctl_elem_type_t elemType;
    snd_ctl_elem_value_t *elemData;
    snd_ctl_elem_info_t *elemInfo;
    int count, idx, err;


    // set info event ID and get value

    snd_ctl_elem_info_alloca(&elemInfo);
    snd_ctl_elem_info_set_id(elemInfo, elemId);
    if (snd_ctl_elem_info(ctlDev, elemInfo) < 0) goto OnErrorExit;
    count = snd_ctl_elem_info_get_count(elemInfo);
    if (count == 0) goto OnErrorExit;

    if (!snd_ctl_elem_info_is_readable(elemInfo)) goto OnErrorExit;
    elemType = snd_ctl_elem_info_get_type(elemInfo);

    snd_ctl_elem_value_alloca(&elemData);
    snd_ctl_elem_value_set_id(elemData, elemId);
    if (snd_ctl_elem_read(ctlDev, elemData) < 0) goto OnErrorExit;

    int numid = snd_ctl_elem_info_get_numid(elemInfo);

    ctlRequest->valuesJ = json_object_new_object();
    json_object_object_add(ctlRequest->valuesJ, "id", json_object_new_int(numid));
    if (queryMode >= 1) json_object_object_add(ctlRequest->valuesJ, "name", json_object_new_string(snd_ctl_elem_id_get_name(elemId)));
    if (queryMode >= 2) json_object_object_add(ctlRequest->valuesJ, "iface", json_object_new_string(snd_ctl_elem_iface_name(snd_ctl_elem_id_get_interface(elemId))));
    if (queryMode >= 3) json_object_object_add(ctlRequest->valuesJ, "actif", json_object_new_boolean(!snd_ctl_elem_info_is_inactive(elemInfo)));

    json_object *jsonValuesCtl = json_object_new_array();
    for (idx = 0; idx < count; idx++) { // start from one in amixer.c !!!
        switch (elemType) {
            case SND_CTL_ELEM_TYPE_BOOLEAN:
            {
                json_object_array_add(jsonValuesCtl, json_object_new_boolean(snd_ctl_elem_value_get_boolean(elemData, idx)));
                break;
            }
            case SND_CTL_ELEM_TYPE_INTEGER:
                json_object_array_add(jsonValuesCtl, json_object_new_int((int) snd_ctl_elem_value_get_integer(elemData, idx)));
                break;
            case SND_CTL_ELEM_TYPE_INTEGER64:
                json_object_array_add(jsonValuesCtl, json_object_new_int64(snd_ctl_elem_value_get_integer64(elemData, idx)));
                break;
            case SND_CTL_ELEM_TYPE_ENUMERATED:
                json_object_array_add(jsonValuesCtl, json_object_new_int(snd_ctl_elem_value_get_enumerated(elemData, idx)));
                break;
            case SND_CTL_ELEM_TYPE_BYTES:
                json_object_array_add(jsonValuesCtl, json_object_new_int((int) snd_ctl_elem_value_get_byte(elemData, idx)));
                break;
            case SND_CTL_ELEM_TYPE_IEC958:
            {
                json_object *jsonIec958Ctl = json_object_new_object();
                snd_aes_iec958_t iec958;
                snd_ctl_elem_value_get_iec958(elemData, &iec958);

                json_object_object_add(jsonIec958Ctl, "AES0", json_object_new_int(iec958.status[0]));
                json_object_object_add(jsonIec958Ctl, "AES1", json_object_new_int(iec958.status[1]));
                json_object_object_add(jsonIec958Ctl, "AES2", json_object_new_int(iec958.status[2]));
                json_object_object_add(jsonIec958Ctl, "AES3", json_object_new_int(iec958.status[3]));
                json_object_array_add(jsonValuesCtl, jsonIec958Ctl);
                break;
            }
            default:
                json_object_array_add(jsonValuesCtl, json_object_new_string("?unknown?"));
                break;
        }
    }
    json_object_object_add(ctlRequest->valuesJ, "val", jsonValuesCtl);

    if (queryMode >= 1) { // in simple mode do not print usable values
        json_object *jsonClassCtl = json_object_new_object();
        json_object_object_add(jsonClassCtl, "type", json_object_new_int(elemType));
        json_object_object_add(jsonClassCtl, "count", json_object_new_int(count));

        switch (elemType) {
            case SND_CTL_ELEM_TYPE_INTEGER:
                json_object_object_add(jsonClassCtl, "min", json_object_new_int((int) snd_ctl_elem_info_get_min(elemInfo)));
                json_object_object_add(jsonClassCtl, "max", json_object_new_int((int) snd_ctl_elem_info_get_max(elemInfo)));
                json_object_object_add(jsonClassCtl, "step", json_object_new_int((int) snd_ctl_elem_info_get_step(elemInfo)));
                break;
            case SND_CTL_ELEM_TYPE_INTEGER64:
                json_object_object_add(jsonClassCtl, "min", json_object_new_int64(snd_ctl_elem_info_get_min64(elemInfo)));
                json_object_object_add(jsonClassCtl, "max", json_object_new_int64(snd_ctl_elem_info_get_max64(elemInfo)));
                json_object_object_add(jsonClassCtl, "step", json_object_new_int64(snd_ctl_elem_info_get_step64(elemInfo)));
                break;
            case SND_CTL_ELEM_TYPE_ENUMERATED:
            {
                unsigned int item, items = snd_ctl_elem_info_get_items(elemInfo);
                json_object *jsonEnum = json_object_new_array();

                for (item = 0; item < items; item++) {
                    snd_ctl_elem_info_set_item(elemInfo, item);
                    if ((err = snd_ctl_elem_info(ctlDev, elemInfo)) >= 0) {
                        json_object_array_add(jsonEnum, json_object_new_string(snd_ctl_elem_info_get_item_name(elemInfo)));
                    }
                }
                json_object_object_add(jsonClassCtl, "enums", jsonEnum);
                break;
            }
            default: break; // ignore any unknown type
        }

        // add collected class info with associated ACLs
        json_object_object_add(ctlRequest->valuesJ, "ctl", jsonClassCtl);

        if (queryMode >= QUERY_FULL) json_object_object_add(ctlRequest->valuesJ, "acl", getControlAcl(elemInfo));

        // check for tlv [direct port from amixer.c]
        if (snd_ctl_elem_info_is_tlv_readable(elemInfo)) {
            unsigned int *tlv = alloca(TLV_BYTE_SIZE);
            if ((err = snd_ctl_elem_tlv_read(ctlDev, elemId, tlv, 4096)) < 0) {
                AFB_NOTICE("Control numid=%d err=%s element TLV read error\n", numid, snd_strerror(err));
                goto OnErrorExit;
            } else {
                json_object_object_add(ctlRequest->valuesJ, "tlv", decodeTlv(tlv, TLV_BYTE_SIZE, queryMode));
            }
        }
    }

    ctlRequest->used = 1;
    return 0;

OnErrorExit:
    ctlRequest->used = -1;
    return -1;
}

// assign multiple control to the same value

STATIC void alsaSetGetCtls(ActionSetGetT action, afb_req request) {
    ctlRequestT *ctlRequest;
    const char *warmsg = NULL;
    int err = 0, status = 0, done;
    unsigned int ctlCount;
    snd_ctl_t *ctlDev;
    snd_ctl_elem_list_t *ctlList;
    queryValuesT queryValues;
    json_object *queryJ, *numidsJ, *sndctls;

    queryJ = alsaCheckQuery(request, &queryValues);
    if (!queryJ) goto OnErrorExit;

    // Prase Numids + optional values
    done = json_object_object_get_ex(queryJ, "ctl", &numidsJ);
    if (!done) queryValues.count = 0;
    else {
        enum json_type jtype = json_object_get_type(numidsJ);
        switch (jtype) {
            case json_type_array:
                queryValues.numidsJ = numidsJ;
                queryValues.count = json_object_array_length(numidsJ);
                break;

            case json_type_int:
            case json_type_object:
                queryValues.count = 1;
                queryValues.numidsJ = numidsJ;
                break;

            default:
                afb_req_fail_f(request, "numid-notarray", "NumId=%s NumId not valid JSON array", json_object_get_string(numidsJ));
                goto OnErrorExit;
        }
    }

    if ((err = snd_ctl_open(&ctlDev, queryValues.devid, 0)) < 0) {
        afb_req_fail_f(request, "sndcrl-notfound", "devid='%s' load fail error=%s\n", queryValues.devid, snd_strerror(err));
        goto OnErrorExit;
    }

    snd_ctl_elem_list_alloca(&ctlList);
    if ((err = snd_ctl_elem_list(ctlDev, ctlList)) < 0) {
        afb_req_fail_f(request, "listInit-failed", "devid='%s' load fail error=%s\n", queryValues.devid, snd_strerror(err));
        goto OnErrorExit;
    }

    if ((err = snd_ctl_elem_list_alloc_space(ctlList, snd_ctl_elem_list_get_count(ctlList))) < 0) {
        afb_req_fail_f(request, "listAlloc-failed", "devid='%s' load fail error=%s\n", queryValues.devid, snd_strerror(err));
        goto OnErrorExit;
    }

    if ((err = snd_ctl_elem_list(ctlDev, ctlList)) < 0) {
        afb_req_fail_f(request, "listOpen-failed", "devid='%s' load fail error=%s\n", queryValues.devid, snd_strerror(err));
        goto OnErrorExit;
    }

    // Parse numids string (empty == all)
    ctlCount = snd_ctl_elem_list_get_used(ctlList);
    if (queryValues.count == 0) {
        ctlRequest = alloca(sizeof (ctlRequestT)*(ctlCount));
    } else {
        ctlRequest = alloca(sizeof (ctlRequestT)*(queryValues.count));
        NumidsListParse(action, &queryValues, ctlRequest);
    }

    // if more than one crl requested prepare an array for response
    if (queryValues.count != 1 && action == ACTION_GET) sndctls = json_object_new_array();
    else sndctls = NULL;

    // Loop on all ctlDev controls
    for (int ctlIndex = 0; ctlIndex < ctlCount; ctlIndex++) {
        unsigned int selected = 0;
        int jdx;

        if (queryValues.count == 0 && action == ACTION_GET) {
            selected = 1; // check is this numid is selected within query
            jdx = ctlIndex; // map all existing ctl as requested
        } else {
            int numid = snd_ctl_elem_list_get_numid(ctlList, ctlIndex);
            if (numid < 0) {
                AFB_NOTICE("snd_ctl_elem_list_get_numid index=%d fail", ctlIndex);
                continue;
            }
            // check if current control was requested in query numids list
            for (jdx = 0; jdx < queryValues.count; jdx++) {
                if (numid == ctlRequest[jdx].numId) {
                    selected = 1;
                    break;
                }
            }
        }

        // control is selected open ctlid and get value
        if (selected) {
            snd_ctl_elem_id_t *elemId;
            snd_ctl_elem_id_alloca(&elemId);

            snd_ctl_elem_list_get_id(ctlList, ctlIndex, elemId);
            switch (action) {
                case ACTION_GET:
                    err = alsaGetSingleCtl(ctlDev, elemId, &ctlRequest[jdx], queryValues.mode);
                    break;

                case ACTION_SET:
                    err = alsaSetSingleCtl(ctlDev, elemId, &ctlRequest[jdx]);
                    break;

                default:
                    err = 1;
            }
            if (err) status++;
            else {
                // Do not embed response in an array when only one ctl was requested
                if (action == ACTION_GET) {
                    if (queryValues.count > 1) json_object_array_add(sndctls, ctlRequest[jdx].valuesJ);
                    else sndctls = ctlRequest[jdx].valuesJ;
                }
            }
        }
    }

    // if we had error let's add them into response message info
    json_object *warningsJ = json_object_new_array();
    for (int jdx = 0; jdx < queryValues.count; jdx++) {
        if (ctlRequest[jdx].used <= 0) {
            json_object *failctl = json_object_new_object();
            if (ctlRequest[jdx].numId == -1) json_object_object_add(failctl, "warning", json_object_new_string("Numid Invalid"));
            else {
                if (ctlRequest[jdx].used == 0) json_object_object_add(failctl, "warning", json_object_new_string("Numid Does Not Exist"));
                if (ctlRequest[jdx].used == -1) json_object_object_add(failctl, "warning", json_object_new_string("Value Refused"));
            }

            json_object_object_add(failctl, "ctl", ctlRequest[jdx].jToken);

            json_object_array_add(warningsJ, failctl);
        }
        /* WARNING!!!! Check with Jose why following put free valuesJ
        if (ctlRequest[jdx].jToken) json_object_put(ctlRequest[jdx].jToken);
        if (ctlRequest[jdx].valuesJ) json_object_put(ctlRequest[jdx].valuesJ);
         */
    }

    if (json_object_array_length(warningsJ) > 0) warmsg = json_object_get_string(warningsJ);
    else json_object_put(warningsJ);

    // send response+warning if any
    afb_req_success(request, sndctls, warmsg);
    snd_ctl_elem_list_clear(ctlList);

OnErrorExit:
    return;
}

PUBLIC void alsaGetCtls(afb_req request) {
    alsaSetGetCtls(ACTION_GET, request);
}

PUBLIC void alsaSetCtls(afb_req request) {
    alsaSetGetCtls(ACTION_SET, request);
}