Initial working version as independent repo

1 files changed, 815 insertions, 0 deletions

diff --git a/alsa-binding/Alsa-SetGet.c b/alsa-binding/Alsa-SetGet.c
new file mode 100644
index 0000000..2083a53
--- /dev/null
+++ b/alsa-binding/Alsa-SetGet.c
@@ -0,0 +1,815 @@
+/*
+ * 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)) {
+                    AFB_NOTICE("Invalid Json=%s missing 'id'", json_object_get_string(ctlRequest[idx].jToken));
+                    ctlRequest[idx].used = -1;
+                } else {
+                    ctlRequest[idx].numId = json_object_get_int(jId);
+                    if (action == ACTION_SET) {
+                        if (!json_object_object_get_ex(ctlRequest[idx].jToken, "val", &valuesJ)) {
+                            AFB_NOTICE("Invalid Json=%s missing 'val'", json_object_get_string(ctlRequest[idx].jToken));
+                            ctlRequest[idx].used = -1;                            
+                        } else
+                            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, queryModeE 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) sndctls = ctlRequest[jdx].valuesJ;
+                    else json_object_array_add(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);
+}
+
+