Work in Progress

8 files changed, 2216 insertions, 0 deletions

diff --git a/Alsa-afb/Alsa-AddCtl.c b/Alsa-afb/Alsa-AddCtl.c
new file mode 100644
index 0000000..f7ef92e
--- /dev/null
+++ b/Alsa-afb/Alsa-AddCtl.c
@@ -0,0 +1,372 @@
+/*
+ * AlsaUseCase -- 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://kernel.readthedocs.io/en/sphinx-samples/writing-an-alsa-driver.html#control-names
+ *  https://01.org/linuxgraphics/gfx-docs/drm/sound/designs/control-names.html
+
+ */
+#define _GNU_SOURCE  // needed for vasprintf
+
+#include <alsa/asoundlib.h>
+#include <alsa/sound/tlv.h>
+#include <systemd/sd-event.h>
+#include <sys/ioctl.h>
+
+#include "Alsa-ApiHat.h"
+
+// Performs like a toggle switch for attenuation, because they're bool (ref:user-ctl-element-set.c)
+
+static const unsigned int *allocate_bool_fake_tlv(void) {
+    static const SNDRV_CTL_TLVD_DECLARE_DB_MINMAX(range, -10000, 0);
+    unsigned int *tlv = malloc(sizeof (range));
+    if (tlv == NULL) return NULL;
+    memcpy(tlv, range, sizeof (range));
+    return tlv;
+}
+
+static const unsigned int *allocate_int_dbscale_tlv(int min, int step, int mute) {
+    // SNDRV_CTL_TLVD_DECLARE_DB_SCALE(range, min, step, mute);
+    size_t tlvSize = sizeof (4 * sizeof (unsigned int));
+    unsigned int *tlv = malloc(tlvSize);
+    tlv[0] = SNDRV_CTL_TLVT_DB_LINEAR;
+    tlv[1] = (int) tlvSize;
+    tlv[2] = min * 100;
+    tlv[3] = ((step * 100) & SNDRV_CTL_TLVD_DB_SCALE_MASK) | ((mute * 100) ? SNDRV_CTL_TLVD_DB_SCALE_MUTE : 0);
+    return tlv;
+}
+
+static const unsigned int *allocate_int_linear_tlv(int max, int min) {
+    // SNDRV_CTL_TLVD_DECLARE_DB_LINEAR (range, min, max);
+    size_t tlvSize = sizeof (4 * sizeof (unsigned int));
+    unsigned int *tlv = malloc(tlvSize);
+    tlv[0] = SNDRV_CTL_TLVT_DB_LINEAR;
+    tlv[1] = (int) tlvSize;
+    tlv[2] = -min * 100;
+    tlv[3] = max * 100;
+    return tlv;
+}
+
+STATIC json_object * addOneSndCtl(afb_req request, snd_ctl_t *ctlDev, json_object *ctlJ, halQueryMode queryMode) {
+    int err, done, ctlNumid, ctlValue, shouldCreate;
+    json_object *tmpJ;
+    const char *ctlName;
+    ctlRequestT ctlRequest;
+    int ctlMax, ctlMin, ctlStep, ctlCount, ctlSubDev, ctlSndDev;
+    snd_ctl_elem_type_t ctlType;
+    snd_ctl_elem_info_t *elemInfo;
+    snd_ctl_elem_id_t *elemId;
+    snd_ctl_elem_value_t *elemValue;
+    const unsigned int *elemTlv = NULL;
+
+    // parse json ctl object
+    json_object_object_get_ex(ctlJ, "name", &tmpJ);
+    ctlName = json_object_get_string(tmpJ);
+
+    json_object_object_get_ex(ctlJ, "ctl", &tmpJ);
+    ctlNumid = json_object_get_int(tmpJ);
+
+    if (!ctlNumid && !ctlName) {
+        afb_req_fail_f(request, "ctl-invalid", "crl=%s name or numid missing", json_object_get_string(ctlJ));
+        goto OnErrorExit;
+    }
+
+
+    // We are facing a software ctl
+    if (ctlNumid == CTL_AUTO) {
+        done = json_object_object_get_ex(ctlJ, "type", &tmpJ);
+        if (done) ctlType = json_object_get_int(tmpJ);
+        else ctlType = SND_CTL_ELEM_TYPE_INTEGER;
+
+        json_object_object_get_ex(ctlJ, "value", &tmpJ);
+        ctlValue = json_object_get_int(tmpJ);
+
+        // default for json_object_get_int is zero
+        json_object_object_get_ex(ctlJ, "min", &tmpJ);
+        ctlMin = json_object_get_int(tmpJ);
+
+        done = json_object_object_get_ex(ctlJ, "max", &tmpJ);
+        if (done) ctlMax = json_object_get_int(tmpJ);
+        else {
+            if (ctlType == SND_CTL_ELEM_TYPE_BOOLEAN) ctlMax = 1;
+            else ctlMax = 100;
+        }
+
+        done = json_object_object_get_ex(ctlJ, "step", &tmpJ);
+        if (!done) ctlStep = 1;
+        else ctlStep = json_object_get_int(tmpJ);
+
+        done = json_object_object_get_ex(ctlJ, "count", &tmpJ);
+        if (!done) ctlCount = 1;
+        else ctlCount = json_object_get_int(tmpJ);
+
+        json_object_object_get_ex(ctlJ, "snddev", &tmpJ);
+        ctlSndDev = json_object_get_int(tmpJ);
+
+        json_object_object_get_ex(ctlJ, "subdev", &tmpJ);
+        ctlSubDev = json_object_get_int(tmpJ);
+    }
+
+    // Assert that this ctls is not used
+    snd_ctl_elem_info_alloca(&elemInfo);
+    if (ctlName) snd_ctl_elem_info_set_name(elemInfo, ctlName);
+    if (ctlNumid > 0)snd_ctl_elem_info_set_numid(elemInfo, ctlNumid);
+    snd_ctl_elem_info_set_interface(elemInfo, SND_CTL_ELEM_IFACE_MIXER);
+
+    // If control exist try to reuse it
+    err = snd_ctl_elem_info(ctlDev, elemInfo);
+    if (err) {
+        shouldCreate = 1;
+    } else {
+        int count, min, max, sndDev, subDev;
+        snd_ctl_elem_type_t type;
+
+        // ctl exit let's get associated elemID
+        snd_ctl_elem_id_alloca(&elemId);
+        snd_ctl_elem_info_get_id(elemInfo, elemId);
+
+        // If this is a hardware ctl only update value
+        if (ctlNumid != CTL_AUTO) goto UpdateDefaultVal;
+
+        count = snd_ctl_elem_info_get_count(elemInfo);
+        min = (int) snd_ctl_elem_info_get_min(elemInfo);
+        max = (int) snd_ctl_elem_info_get_max(elemInfo);
+        type = snd_ctl_elem_info_get_type(elemInfo);
+        sndDev = (int) snd_ctl_elem_info_get_device(elemInfo);
+        subDev = (int) snd_ctl_elem_info_get_subdevice(elemInfo);
+
+        if (count == ctlCount && min == ctlMin && max == ctlMax && type == ctlType && sndDev == ctlSndDev && subDev == ctlSubDev) {
+            // Adjust value to best fit request
+            shouldCreate = 0;
+        } else {
+            err = snd_ctl_elem_remove(ctlDev, elemId);
+            shouldCreate = 1;
+            if (err < 0) {
+                AFB_ERROR("addOneSndCtl: ctlName=%s numid=%d fail to reset", snd_ctl_elem_info_get_name(elemInfo), snd_ctl_elem_info_get_numid(elemInfo));
+                goto DoNotUpdate;
+            };
+
+            // Control was deleted need to refresh elemInfo
+            snd_ctl_elem_info_alloca(&elemInfo);
+            if (ctlName) snd_ctl_elem_info_set_name(elemInfo, ctlName);
+            snd_ctl_elem_info_set_interface(elemInfo, SND_CTL_ELEM_IFACE_MIXER);
+            snd_ctl_elem_info(ctlDev, elemInfo);
+        }
+    }
+
+    // Add requested ID into elemInfo
+    snd_ctl_elem_info_set_device(elemInfo, ctlSndDev);
+    snd_ctl_elem_info_set_subdevice(elemInfo, ctlSubDev);
+
+    switch (ctlType) {
+        case SND_CTL_ELEM_TYPE_BOOLEAN:
+            if (shouldCreate) {
+                err = snd_ctl_add_boolean_elem_set(ctlDev, elemInfo, 1, ctlCount);
+                if (err) {
+                    AFB_ERROR("AddOntSndCtl Boolean: devid='%s' name='%s' count=%d", snd_ctl_name(ctlDev), ctlName, ctlCount);
+                    afb_req_fail_f(request, "ctl-invalid-bool", "devid='%s' name='%s' count=%d", snd_ctl_name(ctlDev), ctlName, ctlCount);
+                    goto OnErrorExit;
+                }
+            }
+
+            // Create a dummy TLV
+            elemTlv = allocate_bool_fake_tlv();
+
+            break;
+
+        case SND_CTL_ELEM_TYPE_INTEGER:
+            if (shouldCreate) {
+                err = snd_ctl_add_integer_elem_set(ctlDev, elemInfo, 1, ctlCount, ctlMin, ctlMax, ctlStep);
+                if (err) {
+                    AFB_ERROR("AddOntSndCtl Integer: devid='%s' name='%s' count=%d min=%d max=%d step=%d", snd_ctl_name(ctlDev), ctlName, ctlCount, ctlMin, ctlMax, ctlStep);
+                    afb_req_fail_f(request, "ctl-invalid-bool", "devid='%s' name='%s' count=%d min=%d max=%d step=%d", snd_ctl_name(ctlDev), ctlName, ctlCount, ctlMin, ctlMax, ctlStep);
+                    goto OnErrorExit;
+                }
+            }
+
+            // Fulup needed to be tested with some dB expert !!!
+            json_object *dbscaleJ;
+            if (json_object_object_get_ex(ctlJ, "dbscale", &dbscaleJ)) {
+                int min, max;
+
+                if (json_object_get_type(dbscaleJ) != json_type_object) {
+                    afb_req_fail_f(request, "ctl-invalid-dbscale", "devid=%s crl=%s invalid json in integer control", snd_ctl_name(ctlDev), json_object_get_string(ctlJ));
+                    goto OnErrorExit;
+
+                    json_object_object_get_ex(ctlJ, "min", &tmpJ);
+                    min = json_object_get_int(tmpJ);
+                    if (min >= 0) {
+                        afb_req_fail_f(request, "ctl-invalid-dbscale", "devid=%s crl=%s min should be a negative number", snd_ctl_name(ctlDev), json_object_get_string(ctlJ));
+                        goto OnErrorExit;
+                    }
+
+                    // default value 0=mute
+                    json_object_object_get_ex(ctlJ, "max", &tmpJ);
+                    max = json_object_get_int(tmpJ);
+
+                    // default value 1dB
+                    json_object_object_get_ex(ctlJ, "step", &tmpJ);
+                    int step = json_object_get_int(tmpJ);
+                    if (step <= 0) step = 1;
+
+                    elemTlv = allocate_int_dbscale_tlv(min, max, step);
+
+                }
+            } else {
+                // provide a fake linear TLV
+                elemTlv = allocate_int_linear_tlv(ctlMin, ctlMax);
+            }
+            break;
+
+        case SND_CTL_ELEM_TYPE_ENUMERATED:
+
+            if (shouldCreate) {
+                json_object *enumsJ;
+                json_object_object_get_ex(ctlJ, "enums", &enumsJ);
+                if (json_object_get_type(enumsJ) != json_type_array) {
+                    afb_req_fail_f(request, "ctl-missing-enums", "devid=%s crl=%s mandatory enum=xxx missing in enumerated control", snd_ctl_name(ctlDev), json_object_get_string(ctlJ));
+                    goto OnErrorExit;
+                }
+
+                int length = json_object_array_length(enumsJ);
+                const char **enumlabels = malloc(length * sizeof (char*));
+
+                for (int jdx = 0; jdx < length; jdx++) {
+                    tmpJ = json_object_array_get_idx(enumsJ, jdx);
+                    enumlabels[jdx] = json_object_get_string(tmpJ);
+                }
+
+                err = snd_ctl_add_enumerated_elem_set(ctlDev, elemInfo, 1, ctlCount, length, enumlabels);
+                if (err) {
+                    afb_req_fail_f(request, "ctl-invalid-bool", "devid=%s crl=%s invalid enumerated control", snd_ctl_name(ctlDev), json_object_get_string(ctlJ));
+                    goto OnErrorExit;
+                }
+
+                // Fulup should be an empty container
+                elemTlv = allocate_bool_fake_tlv();
+            }
+            break;
+
+            // Long Term Waiting ToDoList
+        case SND_CTL_ELEM_TYPE_INTEGER64:
+        case SND_CTL_ELEM_TYPE_BYTES:
+        default:
+            afb_req_fail_f(request, "ctl-invalid-type", "crl=%s unsupported type type=%d numid=%d", json_object_get_string(ctlJ), ctlType, ctlNumid);
+            goto OnErrorExit;
+    }
+
+UpdateDefaultVal:
+
+    // Set Value to default
+    snd_ctl_elem_value_alloca(&elemValue);
+    for (int idx = 0; idx < snd_ctl_elem_info_get_count(elemInfo); idx++) {
+        snd_ctl_elem_value_set_integer(elemValue, idx, ctlValue);
+    }
+
+    // write default values in newly created control
+    snd_ctl_elem_id_alloca(&elemId);
+    snd_ctl_elem_info(ctlDev, elemInfo);
+    snd_ctl_elem_info_get_id(elemInfo, elemId);
+    snd_ctl_elem_value_set_id(elemValue, elemId);
+    err = snd_ctl_elem_write(ctlDev, elemValue);
+    if (err < 0) {
+        AFB_WARNING("addOneSndCtl: crl=%s numid=%d fail to write Values error=%s", json_object_get_string(ctlJ), snd_ctl_elem_info_get_numid(elemInfo), snd_strerror(err));
+        goto DoNotUpdate;
+    }
+
+    // write a default null TLV (if usefull should be implemented for every ctl type) 
+    if (elemTlv) {
+        err = snd_ctl_elem_tlv_write(ctlDev, elemId, elemTlv);
+        if (err < 0) {
+            AFB_WARNING("addOneSndCtl: crl=%s numid=%d fail to write TLV error=%s", json_object_get_string(ctlJ), snd_ctl_elem_info_get_numid(elemInfo), snd_strerror(err));
+            goto DoNotUpdate;
+        }
+    }
+
+DoNotUpdate:
+    // return newly created as a JSON object
+    alsaGetSingleCtl(ctlDev, elemId, &ctlRequest, queryMode);
+    if (ctlRequest.used < 0) {
+        AFB_WARNING("addOneSndCtl: crl=%s numid=%d Fail to get value", json_object_get_string(ctlJ), snd_ctl_elem_info_get_numid(elemInfo));
+    }
+    return ctlRequest.valuesJ;
+
+OnErrorExit:
+    return NULL;
+}
+
+PUBLIC void alsaAddCustomCtls(afb_req request) {
+    int err;
+    json_object *ctlsJ, *ctlsValues, *ctlValues;
+    enum json_type;
+    snd_ctl_t *ctlDev = NULL;
+    const char *devid, *mode;
+
+    devid = afb_req_value(request, "devid");
+    if (devid == NULL) {
+        afb_req_fail_f(request, "devid-missing", "devid MUST be defined for alsaAddCustomCtls");
+        goto OnErrorExit;
+    }
+
+    // open control interface for devid
+    err = snd_ctl_open(&ctlDev, devid, 0);
+    if (err < 0) {
+        afb_req_fail_f(request, "devid-unknown", "SndCard devid=[%s] Not Found err=%s", devid, snd_strerror(err));
+        goto OnErrorExit;
+    }
+
+    // get verbosity level
+    halQueryMode queryMode = QUERY_QUIET;
+    mode = afb_req_value(request, "mode");
+    if (mode != NULL) {
+        sscanf(mode, "%i", (int*) &queryMode);
+    }
+
+    // extract sound controls and parse json
+    ctlsJ = json_tokener_parse(afb_req_value(request, "ctl"));
+    if (!ctlsJ) {
+        afb_req_fail_f(request, "ctls-missing", "ctls MUST be defined as a JSON array for alsaAddCustomCtls");
+        goto OnErrorExit;
+    }
+
+    switch (json_object_get_type(ctlsJ)) {
+        case json_type_object:
+            ctlsValues = addOneSndCtl(request, ctlDev, ctlsJ, queryMode);
+            if (!ctlsValues) goto OnErrorExit;
+            break;
+
+        case json_type_array:
+            ctlsValues = json_object_new_array();
+            for (int idx = 0; idx < json_object_array_length(ctlsJ); idx++) {
+                json_object *ctlJ = json_object_array_get_idx(ctlsJ, idx);
+                ctlValues = addOneSndCtl(request, ctlDev, ctlJ, queryMode);
+                if (ctlValues) json_object_array_add(ctlsValues, ctlValues);
+                else goto OnErrorExit;
+            }
+            break;
+
+        default:
+            afb_req_fail_f(request, "ctls-invalid", "ctls=%s not valid JSON array", json_object_get_string(ctlsJ));
+            goto OnErrorExit;
+    }
+
+    // get ctl as a json response
+    afb_req_success(request, ctlsValues, NULL);
+
+OnErrorExit:
+    if (ctlDev) snd_ctl_close(ctlDev);
+    return;
+}
\ No newline at end of file
diff --git a/Alsa-afb/Alsa-ApiHat.c b/Alsa-afb/Alsa-ApiHat.c
new file mode 100644
index 0000000..2c3c5c1
--- /dev/null
+++ b/Alsa-afb/Alsa-ApiHat.c
@@ -0,0 +1,59 @@
+/*
+ * 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.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <netdb.h>
+#include <fcntl.h>
+#include <math.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include "Alsa-ApiHat.h"
+
+/*
+ * array of the verbs exported to afb-daemon
+ */
+static const struct afb_verb_v2 api_verbs[] = {
+    /* VERB'S NAME          FUNCTION TO CALL  */
+    { .verb = "ping", .callback = pingtest},
+    { .verb = "getinfo", .callback = alsaGetInfo},
+    { .verb = "getctl", .callback = alsaGetCtls},
+    { .verb = "setctl", .callback = alsaSetCtls},
+    { .verb = "subscribe", .callback = alsaEvtSubcribe},
+    { .verb = "getcardid", .callback = alsaGetCardId},
+    { .verb = "halregister", .callback = alsaRegisterHal},
+    { .verb = "hallist", .callback = alsaActiveHal},
+    { .verb = "ucmquery", .callback = alsaUseCaseQuery},
+    { .verb = "ucmset", .callback = alsaUseCaseSet},
+    { .verb = "ucmget", .callback = alsaUseCaseGet},
+    { .verb = "ucmreset", .callback = alsaUseCaseReset},
+    { .verb = "ucmclose", .callback = alsaUseCaseClose},
+    { .verb = "addcustomctl", .callback = alsaAddCustomCtls},
+    { .verb = NULL} /* marker for end of the array */
+};
+
+/*
+ * description of the binding for afb-daemon
+ */
+const struct afb_binding_v2 afbBindingV2 = {
+    .api = "alsacore",
+    .verbs = api_verbs,
+};
diff --git a/Alsa-afb/Alsa-ApiHat.h b/Alsa-afb/Alsa-ApiHat.h
new file mode 100644
index 0000000..b05cfbe
--- /dev/null
+++ b/Alsa-afb/Alsa-ApiHat.h
@@ -0,0 +1,74 @@
+/*
+ * 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.
+ */
+
+ 
+#ifndef ALSALIBMAPPING_H
+#define ALSALIBMAPPING_H
+
+
+#include <alsa/asoundlib.h>
+#include <systemd/sd-event.h>
+#include "audio-common.h"
+
+typedef enum {
+    ACTION_SET,
+    ACTION_GET
+} ActionSetGetT;
+
+// generic structure to pass parsed query values
+typedef struct {
+  const char *devid;
+  json_object *numidsJ;
+  halQueryMode mode;
+  int count;
+} queryValuesT;
+
+// use to store crl numid user request
+typedef struct {
+    unsigned int numId;
+    json_object *jToken;
+    json_object *valuesJ;
+    int used;
+} ctlRequestT;
+
+// import from AlsaAfbBinding
+extern const struct afb_binding_interface *afbIface;
+PUBLIC json_object *alsaCheckQuery (struct afb_req request, queryValuesT *queryValues);
+
+// AlseCoreSetGet exports
+PUBLIC int alsaGetSingleCtl (snd_ctl_t *ctlDev, snd_ctl_elem_id_t *elemId, ctlRequestT *ctlRequest, halQueryMode queryMode);
+PUBLIC void alsaGetInfo (struct afb_req request);
+PUBLIC void alsaGetCtls(struct afb_req request);
+PUBLIC void alsaSetCtls(struct afb_req request);
+
+
+// AlsaUseCase exports
+PUBLIC void alsaUseCaseQuery(struct afb_req request); 
+PUBLIC void alsaUseCaseSet(struct afb_req request); 
+PUBLIC void alsaUseCaseGet(struct afb_req request); 
+PUBLIC void alsaUseCaseClose(struct afb_req request); 
+PUBLIC void alsaUseCaseReset(struct afb_req request); 
+PUBLIC void alsaAddCustomCtls(struct afb_req request); 
+
+// AlsaRegEvt
+PUBLIC void alsaEvtSubcribe (struct afb_req request);
+PUBLIC void alsaGetCardId (struct afb_req request);
+PUBLIC void alsaRegisterHal (struct afb_req request);
+PUBLIC void alsaActiveHal (struct afb_req request);
+
+#endif /* ALSALIBMAPPING_H */
+
diff --git a/Alsa-afb/Alsa-RegEvt.c b/Alsa-afb/Alsa-RegEvt.c
new file mode 100644
index 0000000..080b6cc
--- /dev/null
+++ b/Alsa-afb/Alsa-RegEvt.c
@@ -0,0 +1,395 @@
+/*
+ * 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.
+
+ */
+
+#define _GNU_SOURCE  // needed for vasprintf
+
+#include "Alsa-ApiHat.h"
+
+// generic sndctrl event handle hook to event callback when pooling
+
+typedef struct {
+    struct pollfd pfds;
+    sd_event_source *src;
+    snd_ctl_t *ctlDev;
+    int mode;
+    struct afb_event afbevt;
+} evtHandleT;
+
+typedef struct {
+    int ucount;
+    int cardId;
+    evtHandleT *evtHandle;
+} sndHandleT;
+
+typedef struct {
+    char *devid;
+    char *apiprefix;
+    char *shortname;
+    char *longname;
+} cardRegistryT;
+
+cardRegistryT *cardRegistry[MAX_SND_CARD + 1];
+
+PUBLIC json_object *alsaCheckQuery(afb_req request, queryValuesT *queryValues) {
+
+    json_object *tmpJ;
+    int done;
+
+    // get query from request
+    json_object *queryInJ = afb_req_json(request);
+
+    done = json_object_object_get_ex(queryInJ, "devid", &tmpJ);
+    if (!done) {
+        afb_req_fail_f(request, "devid-missing", "Invalid query='%s'", json_object_get_string(queryInJ));
+        goto OnErrorExit;
+    }
+    queryValues->devid = json_object_get_string(tmpJ);
+
+    done = json_object_object_get_ex(queryInJ, "mode", &tmpJ);
+    if (!done) queryValues->mode = QUERY_QUIET; // default quiet
+    else queryValues->mode = json_object_get_int(tmpJ);
+
+    return queryInJ;
+
+OnErrorExit:
+    return NULL;
+}
+
+// This routine is called when ALSA event are fired
+
+STATIC int sndCtlEventCB(sd_event_source* src, int fd, uint32_t revents, void* userData) {
+    int err, ctlNumid;
+    evtHandleT *evtHandle = (evtHandleT*) userData;
+    snd_ctl_event_t *eventId;
+    json_object *ctlEventJ;
+    unsigned int mask;
+    int iface;
+    int device;
+    int subdev;
+    const char*ctlName;
+    ctlRequestT ctlRequest;
+    snd_ctl_elem_id_t *elemId;
+
+    if ((revents & EPOLLHUP) != 0) {
+        AFB_NOTICE("SndCtl hanghup [car disconnected]");
+        goto ExitOnSucess;
+    }
+
+    if ((revents & EPOLLIN) != 0) {
+
+        // initialise event structure on stack  
+        snd_ctl_event_alloca(&eventId);
+        snd_ctl_elem_id_alloca(&elemId);
+
+        err = snd_ctl_read(evtHandle->ctlDev, eventId);
+        if (err < 0) goto OnErrorExit;
+
+        // we only process sndctrl element
+        if (snd_ctl_event_get_type(eventId) != SND_CTL_EVENT_ELEM) goto ExitOnSucess;
+
+        // we only process value changed events
+        mask = snd_ctl_event_elem_get_mask(eventId);
+        if (!(mask & SND_CTL_EVENT_MASK_VALUE)) goto ExitOnSucess;
+
+        snd_ctl_event_elem_get_id(eventId, elemId);
+
+        err = alsaGetSingleCtl(evtHandle->ctlDev, elemId, &ctlRequest, evtHandle->mode);
+        if (err) goto OnErrorExit;
+
+        // If CTL as a value use it as container for response
+        if (ctlRequest.valuesJ) ctlEventJ = ctlRequest.valuesJ;
+        else {
+            ctlEventJ = json_object_new_object();
+            ctlNumid = snd_ctl_event_elem_get_numid(eventId);
+            json_object_object_add(ctlEventJ, "id", json_object_new_int(ctlNumid));
+        }
+
+        if (evtHandle->mode >= QUERY_COMPACT) {
+            ctlName = snd_ctl_event_elem_get_name(eventId);
+            json_object_object_add(ctlEventJ, "name", json_object_new_string(ctlName));
+        }
+
+        if (evtHandle->mode >= QUERY_VERBOSE) {
+            iface = snd_ctl_event_elem_get_interface(eventId);
+            device = snd_ctl_event_elem_get_device(eventId);
+            subdev = snd_ctl_event_elem_get_subdevice(eventId);
+            json_object_object_add(ctlEventJ, "ifc", json_object_new_int(iface));
+            json_object_object_add(ctlEventJ, "dev", json_object_new_int(device));
+            json_object_object_add(ctlEventJ, "sub", json_object_new_int(subdev));
+        }
+
+
+        AFB_DEBUG("sndCtlEventCB=%s", json_object_get_string(ctlEventJ));
+        afb_event_push(evtHandle->afbevt, ctlEventJ);
+    }
+
+ExitOnSucess:
+    return 0;
+
+OnErrorExit:
+    AFB_WARNING("sndCtlEventCB: ignored unsupported event type");
+    return (0);
+}
+
+// Subscribe to every Alsa CtlEvent send by a given board
+
+PUBLIC void alsaEvtSubcribe(afb_req request) {
+    static sndHandleT sndHandles[MAX_SND_CARD];
+    evtHandleT *evtHandle = NULL;
+    snd_ctl_t *ctlDev = NULL;
+    int err, idx, cardId, idxFree = -1;
+    snd_ctl_card_info_t *cardinfo;
+    queryValuesT queryValues;
+
+    json_object *queryJ = alsaCheckQuery(request, &queryValues);
+    if (!queryJ) goto OnErrorExit;
+
+    // open control interface for devid
+    err = snd_ctl_open(&ctlDev, queryValues.devid, SND_CTL_READONLY);
+    if (err < 0) {
+        afb_req_fail_f(request, "devid-unknown", "SndCard devid=%s Not Found err=%s", queryValues.devid, snd_strerror(err));
+        goto OnErrorExit;
+    }
+
+    snd_ctl_card_info_alloca(&cardinfo);
+    if ((err = snd_ctl_card_info(ctlDev, cardinfo)) < 0) {
+        afb_req_fail_f(request, "devid-invalid", "SndCard devid=%s Not Found err=%s", queryValues.devid, snd_strerror(err));
+        goto OnErrorExit;
+    }
+
+    cardId = snd_ctl_card_info_get_card(cardinfo);
+
+    // search for an existing subscription and mark 1st free slot
+    for (idx = 0; idx < MAX_SND_CARD; idx++) {
+        if (sndHandles[idx].ucount > 0 && cardId == sndHandles[idx].cardId) {
+            evtHandle = sndHandles[idx].evtHandle;
+            break;
+        } else if (idxFree == -1) idxFree = idx;
+    };
+
+    // if not subscription exist for the event let's create one
+    if (idx == MAX_SND_CARD) {
+
+        // reach MAX_SND_CARD event registration
+        if (idxFree == -1) {
+            afb_req_fail_f(request, "register-toomany", "Cannot register new event Maxcard==%d", idx);
+            goto OnErrorExit;
+        }
+
+        evtHandle = malloc(sizeof (evtHandleT));
+        evtHandle->ctlDev = ctlDev;
+        evtHandle->mode = queryValues.mode;
+        sndHandles[idxFree].ucount = 0;
+        sndHandles[idxFree].cardId = cardId;
+        sndHandles[idxFree].evtHandle = evtHandle;
+
+        // subscribe for sndctl events attached to devid
+        err = snd_ctl_subscribe_events(evtHandle->ctlDev, 1);
+        if (err < 0) {
+            afb_req_fail_f(request, "subscribe-fail", "Cannot subscribe events from devid=%s err=%d", queryValues.devid, err);
+            goto OnErrorExit;
+        }
+
+        // get pollfd attach to this sound board
+        snd_ctl_poll_descriptors(evtHandle->ctlDev, &evtHandle->pfds, 1);
+
+        // register sound event to binder main loop
+        err = sd_event_add_io(afb_daemon_get_event_loop(), &evtHandle->src, evtHandle->pfds.fd, EPOLLIN, sndCtlEventCB, evtHandle);
+        if (err < 0) {
+            afb_req_fail_f(request, "register-mainloop", "Cannot hook events to mainloop devid=%s err=%d", queryValues.devid, err);
+            goto OnErrorExit;
+        }
+
+        // create binder event attached to devid name
+        evtHandle->afbevt = afb_daemon_make_event(queryValues.devid);
+        if (!afb_event_is_valid(evtHandle->afbevt)) {
+            afb_req_fail_f(request, "register-event", "Cannot register new binder event name=%s", queryValues.devid);
+            goto OnErrorExit;
+        }
+
+        // everything looks OK let's move forward 
+        idx = idxFree;
+    }
+
+    // subscribe to binder event    
+    err = afb_req_subscribe(request, evtHandle->afbevt);
+    if (err != 0) {
+        afb_req_fail_f(request, "register-eventname", "Cannot subscribe binder event name=%s [invalid channel]", queryValues.devid);
+        goto OnErrorExit;
+    }
+
+    // increase usage count and return success
+    sndHandles[idx].ucount++;
+    afb_req_success(request, NULL, NULL);
+    return;
+
+OnErrorExit:
+    if (ctlDev) snd_ctl_close(ctlDev);
+    return;
+}
+
+// Subscribe to every Alsa CtlEvent send by a given board
+
+STATIC json_object *alsaProbeCardId(afb_req request) {
+    char devid [10];
+    const char *ctlName, *shortname, *longname;
+    int card, err, index, idx;
+    json_object *responseJ;
+    snd_ctl_t *ctlDev;
+    snd_ctl_card_info_t *cardinfo;
+
+    const char *sndname = afb_req_value(request, "sndname");
+    if (sndname == NULL) {
+        afb_req_fail_f(request, "argument-missing", "sndname=SndCardName missing");
+        goto OnErrorExit;
+    }
+
+    // loop on potential card number
+    snd_ctl_card_info_alloca(&cardinfo);
+    for (card = 0; card < MAX_SND_CARD; card++) {
+
+        // build card devid and probe it
+        snprintf(devid, sizeof (devid), "hw:%i", card);
+
+        // open control interface for devid
+        err = snd_ctl_open(&ctlDev, devid, SND_CTL_READONLY);
+        if (err < 0) continue;
+
+        // extract sound card information
+        snd_ctl_card_info(ctlDev, cardinfo);
+        index = snd_ctl_card_info_get_card(cardinfo);
+        ctlName = snd_ctl_card_info_get_id(cardinfo);
+        shortname = snd_ctl_card_info_get_name(cardinfo);
+        longname = snd_ctl_card_info_get_longname(cardinfo);
+
+        // check if short|long name match        
+        if (!strcmp(sndname, ctlName)) break;
+        if (!strcmp(sndname, shortname)) break;
+        if (!strcmp(sndname, longname)) break;
+    }
+
+    if (card == MAX_SND_CARD) {
+        afb_req_fail_f(request, "ctlDev-notfound", "Fail to find card with name=%s", sndname);
+        goto OnErrorExit;
+    }
+
+    // proxy ctlevent as a binder event        
+    responseJ = json_object_new_object();
+    json_object_object_add(responseJ, "index", json_object_new_int(index));
+    json_object_object_add(responseJ, "devid", json_object_new_string(devid));
+    json_object_object_add(responseJ, "shortname", json_object_new_string(shortname));
+    json_object_object_add(responseJ, "longname", json_object_new_string(longname));
+
+    // search for a HAL binder card mapping name to api prefix
+    for (idx = 0; (idx < MAX_SND_CARD && cardRegistry[idx]); idx++) {
+        if (!strcmp(cardRegistry[idx]->shortname, shortname)) {
+            json_object_object_add(responseJ, "halapi", json_object_new_string(cardRegistry[idx]->apiprefix));
+            break;
+        }
+    }
+
+    return responseJ;
+
+OnErrorExit:
+    return NULL;
+}
+
+// Make alsaProbeCardId compatible with AFB request
+
+PUBLIC void alsaGetCardId(afb_req request) {
+
+    json_object *responseJ = alsaProbeCardId(request);
+    if (responseJ) afb_req_success(request, responseJ, NULL);
+}
+
+// Return list of active resgistrated HAL with corresponding sndcard
+
+PUBLIC void alsaActiveHal(afb_req request) {
+    json_object *responseJ = json_object_new_array();
+
+    for (int idx = 0; idx < MAX_SND_CARD; idx++) {
+        if (!cardRegistry[idx]) break;
+
+        json_object *haldevJ = json_object_new_object();
+        json_object_object_add(haldevJ, "api", json_object_new_string(cardRegistry[idx]->apiprefix));
+        if (cardRegistry[idx]->devid) json_object_object_add(haldevJ, "devid", json_object_new_string(cardRegistry[idx]->devid));
+        if (cardRegistry[idx]->shortname)json_object_object_add(haldevJ, "shortname", json_object_new_string(cardRegistry[idx]->shortname));
+        if (cardRegistry[idx]->longname) json_object_object_add(haldevJ, "longname", json_object_new_string(cardRegistry[idx]->longname));
+        json_object_array_add(responseJ, haldevJ);
+    }
+
+    afb_req_success(request, responseJ, NULL);
+}
+
+
+// Register loaded HAL with board Name and API prefix
+
+PUBLIC void alsaRegisterHal(afb_req request) {
+    static int index = 0;
+    json_object *responseJ;
+    const char *shortname, *apiPrefix;
+
+    apiPrefix = afb_req_value(request, "prefix");
+    if (apiPrefix == NULL) {
+        afb_req_fail_f(request, "argument-missing", "prefix=BindingApiPrefix missing");
+        goto OnErrorExit;
+    }
+
+    shortname = afb_req_value(request, "sndname");
+    if (shortname == NULL) {
+        afb_req_fail_f(request, "argument-missing", "sndname=SndCardName missing");
+        goto OnErrorExit;
+    }
+
+    if (index == MAX_SND_CARD) {
+        afb_req_fail_f(request, "alsahal-toomany", "Fail to register sndname=[%s]", shortname);
+        goto OnErrorExit;
+    }
+
+    // alsaGetCardId should be check to register only valid card    
+    responseJ = alsaProbeCardId(request);
+    if (responseJ) {
+        json_object *tmpJ;
+        int done;
+
+        cardRegistry[index] = malloc(sizeof (cardRegistry));
+        cardRegistry[index]->apiprefix = strdup(apiPrefix);
+        cardRegistry[index]->shortname = strdup(shortname);
+
+        done = json_object_object_get_ex(responseJ, "devid", &tmpJ);
+        if (done) cardRegistry[index]->devid = strdup(json_object_get_string(tmpJ));
+        else cardRegistry[index]->devid = NULL;
+
+        done = json_object_object_get_ex(responseJ, "longname", &tmpJ);
+        if (done) cardRegistry[index]->longname = strdup(json_object_get_string(tmpJ));
+        else cardRegistry[index]->longname = NULL;
+
+        // make sure register close with a null value
+        index++;
+        cardRegistry[index] = NULL;
+
+        afb_req_success(request, responseJ, NULL);
+    }
+
+    // If OK return sound card Alsa ID+Info
+    return;
+
+OnErrorExit:
+    return;
+}
+
diff --git a/Alsa-afb/Alsa-SetGet.c b/Alsa-afb/Alsa-SetGet.c
new file mode 100644
index 0000000..04f2929
--- /dev/null
+++ b/Alsa-afb/Alsa-SetGet.c
@@ -0,0 +1,809 @@
+/*
+ * 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);
+}
+
+
diff --git a/Alsa-afb/Alsa-Ucm.c b/Alsa-afb/Alsa-Ucm.c
new file mode 100644
index 0000000..016fe10
--- /dev/null
+++ b/Alsa-afb/Alsa-Ucm.c
@@ -0,0 +1,433 @@
+/*
+ * AlsaUseCase -- 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:
+      http://www.alsa-project.org/alsa-doc/alsa-lib/group__ucm.html
+      https://www.alsa-project.org/main/index.php/DAPM
+      http://alsa-lib.sourcearchive.com/documentation/1.0.24.1-2/group__Use_ga4332c6bb50481bbdaf21be11551fb930.html
+      https://android.googlesource.com/platform/hardware/qcom/audio/+/jb-mr1-dev/libalsa-intf/alsa_ucm.h
+ 
+   Sample alsaucm commands using /usr/share/alsa/ucm/PandaBoard 
+    - alsaucm  -c PandaBoard list _verbs
+    - alsaucm  -c PandaBoard list _devices/HiFi
+    - alsaucm  -c PandaBoard list _modifiers/HiFi  #need to uncomment modifiers section
+    - alsaucm  -c PandaBoard list TQ/HiFi
+    - alsaucm  -c PandaBoard get TQ/HiFi/Voice
+    - alsaucm  -c PandaBoard get PlaybackPCM//HiFi
+    - alsaucm  -c PandaBoard set _verb HiFi
+    - alsaucm  -c PandaBoard set _verb HiFi _enadev Headset
+    - alsaucm  -c 'HDA Intel PCH'  set _verb HiFi set  _enadev Headphone set _enamod RecordMedia
+    - alsaucm  -c 'HDA Intel PCH'  set _verb HiFi get OutputDspName//
+
+ */
+#define _GNU_SOURCE  // needed for vasprintf
+
+#include <alsa/asoundlib.h>
+#include <alsa/asoundlib.h>
+#include <alsa/use-case.h>
+
+#include "Alsa-ApiHat.h"
+
+typedef struct {
+    snd_use_case_mgr_t *ucm;
+    int cardId;
+    char *cardName;
+} ucmHandleT;
+
+static ucmHandleT ucmHandles[MAX_SND_CARD];
+
+// Cache opened UCM handles 
+
+STATIC int alsaUseCaseOpen(struct afb_req request, queryValuesT *queryValues, int allowNewMgr) {
+    snd_ctl_t *ctlDev;
+    snd_ctl_card_info_t *cardinfo;
+    snd_use_case_mgr_t *ucmHandle;
+    const char *cardName;
+    int cardId, idx, idxFree = -1, err;
+
+    // open control interface for devid
+    err = snd_ctl_open(&ctlDev, queryValues->devid, SND_CTL_READONLY);
+    if (err < 0) {
+        ctlDev = NULL;
+        afb_req_fail_f(request, "devid-unknown", "SndCard devid=[%s] Not Found err=%d", queryValues->devid, err);
+        goto OnErrorExit;
+    }
+
+    snd_ctl_card_info_alloca(&cardinfo);
+    if ((err = snd_ctl_card_info(ctlDev, cardinfo)) < 0) {
+        afb_req_fail_f(request, "devid-invalid", "SndCard devid=[%s] Not Found err=%s", queryValues->devid, snd_strerror(err));
+        goto OnErrorExit;
+    }
+
+    // search for an existing subscription and mark 1st free slot
+    cardId = snd_ctl_card_info_get_card(cardinfo);
+    for (idx = 0; idx < MAX_SND_CARD; idx++) {
+        if (ucmHandles[idx].ucm != NULL) {
+            if (ucmHandles[idx].cardId == cardId) goto OnSuccessExit;
+        } else if (idxFree == -1) idxFree = idx;
+    };
+
+    if (!allowNewMgr) {
+        afb_req_fail_f(request, "ucm-nomgr", "SndCard devid=[%s] no exiting UCM manager session", queryValues->devid);
+        goto OnErrorExit;
+    }
+
+    if (idxFree < 0 && idx == MAX_SND_CARD) {
+        afb_req_fail_f(request, "ucm-toomany", "SndCard devid=[%s] too many open UCM Max=%d", queryValues->devid, MAX_SND_CARD);
+        goto OnErrorExit;
+    }
+
+    idx = idxFree;
+    cardName = snd_ctl_card_info_get_name(cardinfo);
+    err = snd_use_case_mgr_open(&ucmHandle, cardName);
+    if (err) {
+        afb_req_fail_f(request, "ucm-open", "SndCard devid=[%s] name=[%s] No UCM Profile err=%s", queryValues->devid, cardName, snd_strerror(err));
+        goto OnErrorExit;
+    }
+    ucmHandles[idx].ucm = ucmHandle;
+    ucmHandles[idx].cardId = cardId;
+    ucmHandles[idx].cardName = strdup(cardName);
+
+OnSuccessExit:
+    if (ctlDev) snd_ctl_close(ctlDev);
+    return idx;
+
+OnErrorExit:
+    if (ctlDev) snd_ctl_close(ctlDev);
+    return -1;
+}
+
+PUBLIC void alsaUseCaseQuery(struct afb_req request) {
+    int verbCount, ucmIdx;
+    const char **verbList;
+    snd_use_case_mgr_t *ucmHandle;
+    queryValuesT queryValues;
+    json_object *ucmJs;
+    const char *cardName;
+
+    json_object *queryJ = alsaCheckQuery(request, &queryValues);
+    if (!queryJ) goto OnErrorExit;
+
+    ucmIdx = alsaUseCaseOpen(request, &queryValues, TRUE);
+    if (ucmIdx < 0) goto OnErrorExit;
+    ucmHandle = ucmHandles [ucmIdx].ucm;
+    cardName = ucmHandles [ucmIdx].cardName;
+
+    verbCount = snd_use_case_get_list(ucmHandle, "_verbs", &verbList);
+    if (verbCount < 0) {
+        afb_req_fail_f(request, "ucm-list", "SndCard devid=[%s] name=[%s] No UCM Verbs", queryValues.devid, cardName);
+        goto OnErrorExit;
+    }
+
+    ucmJs = json_object_new_array();
+    for (int idx = 0; idx < verbCount; idx += 2) {
+        int devCount, modCount, tqCount;
+        const char **devList, **modList, **tqList;
+        json_object *ucmJ = json_object_new_object();
+        char identifier[32];
+
+        json_object_object_add(ucmJ, "verb", json_object_new_string(verbList[idx]));
+        if (verbList[idx + 1]) json_object_object_add(ucmJ, "info", json_object_new_string(verbList[idx + 1]));
+
+        AFB_DEBUG("Verb[%d] Action=%s Info=%s", idx, verbList[idx], verbList[idx + 1]);
+
+        snprintf(identifier, sizeof (identifier), "_devices/%s", verbList[idx]);
+        devCount = snd_use_case_get_list(ucmHandle, identifier, &devList);
+        if (devCount > 0) {
+            json_object *devsJ = json_object_new_array();
+
+            for (int jdx = 0; jdx < devCount; jdx += 2) {
+                json_object *devJ = json_object_new_object();
+                AFB_DEBUG("device[%d] Action=%s Info=%s", jdx, devList[jdx], devList[jdx + 1]);
+                json_object_object_add(devJ, "dev", json_object_new_string(devList[jdx]));
+                if (devList[jdx + 1]) json_object_object_add(devJ, "info", json_object_new_string(devList[jdx + 1]));
+                json_object_array_add(devsJ, devJ);
+            }
+            json_object_object_add(ucmJ, "devices", devsJ);
+            snd_use_case_free_list(devList, devCount);
+        }
+
+        snprintf(identifier, sizeof (identifier), "_modifiers/%s", verbList[idx]);
+        modCount = snd_use_case_get_list(ucmHandle, identifier, &modList);
+        if (modCount > 0) {
+            json_object *modsJ = json_object_new_array();
+
+            for (int jdx = 0; jdx < modCount; jdx += 2) {
+                json_object *modJ = json_object_new_object();
+                AFB_DEBUG("modifier[%d] Action=%s Info=%s", jdx, modList[jdx], modList[jdx + 1]);
+                json_object_object_add(modJ, "mod", json_object_new_string(modList[jdx]));
+                if (modList[jdx + 1]) json_object_object_add(modJ, "info", json_object_new_string(modList[jdx + 1]));
+                json_object_array_add(modsJ, modJ);
+            }
+            json_object_object_add(ucmJ, "modifiers", modsJ);
+            snd_use_case_free_list(modList, modCount);
+        }
+
+        snprintf(identifier, sizeof (identifier), "TQ/%s", verbList[idx]);
+        tqCount = snd_use_case_get_list(ucmHandle, identifier, &tqList);
+        if (tqCount > 0) {
+            json_object *tqsJ = json_object_new_array();
+
+            for (int jdx = 0; jdx < tqCount; jdx += 2) {
+                json_object *tqJ = json_object_new_object();
+                AFB_DEBUG("toneqa[%d] Action=%s Info=%s", jdx, tqList[jdx], tqList[jdx + 1]);
+                json_object_object_add(tqJ, "tq", json_object_new_string(tqList[jdx]));
+                if (tqList[jdx + 1]) json_object_object_add(tqJ, "info", json_object_new_string(tqList[jdx + 1]));
+                json_object_array_add(tqsJ, tqJ);
+            }
+            json_object_object_add(ucmJ, "tqs", tqsJ);
+            snd_use_case_free_list(tqList, tqCount);
+        }
+
+        json_object_array_add(ucmJs, ucmJ);
+    }
+
+    afb_req_success(request, ucmJs, NULL);
+    snd_use_case_free_list(verbList, verbCount);
+
+OnErrorExit:
+    return;
+}
+
+STATIC json_object *ucmGetValue(ucmHandleT *ucmHandle, const char *verb, const char *mod, const char *label) {
+    char identifier[80];
+    char *value;
+    int err;
+    json_object *jValue;
+
+    // handle optional parameters
+    if (!mod) mod = "";
+    if (!verb) verb = "";
+
+    if (!label) {
+        AFB_NOTICE("ucmGetValue cardname=[%s] value label missing", ucmHandle->cardName);
+        goto OnErrorExit;
+    }
+
+    snprintf(identifier, sizeof (identifier), "%s/%s/%s", label, mod, verb);
+    err = snd_use_case_get(ucmHandle->ucm, identifier, (const char**) &value); // Note: value casting is a known "FEATURE" of AlsaUCM API
+    if (err) {
+        AFB_DEBUG("ucmGetValue cardname=[%s] identifier=[%s] error=%s", ucmHandle->cardName, identifier, snd_strerror(err));
+        goto OnErrorExit;
+    }
+
+    // copy value into json object and free string
+    jValue = json_object_new_string(value);
+    free(value);
+    return (jValue);
+
+OnErrorExit:
+    return (NULL);
+}
+
+PUBLIC void alsaUseCaseGet(struct afb_req request) {
+    int ucmIdx, labelCount;
+    queryValuesT queryValues;
+    json_object *jResponse = json_object_new_object();
+    json_object *jWarnings = json_object_new_array();
+    const char *warnings = NULL;
+
+    json_object *queryJ = alsaCheckQuery(request, &queryValues);
+    if (!queryJ) goto OnErrorExit;
+    ;
+
+    ucmIdx = alsaUseCaseOpen(request, &queryValues, TRUE);
+    if (ucmIdx < 0) goto OnErrorExit;
+
+    const char *cardName = ucmHandles[ucmIdx].cardName;
+
+    const char *verb = afb_req_value(request, "verb");
+    const char *mod = afb_req_value(request, "mod");
+    const char *dev = afb_req_value(request, "dev");
+
+    if (dev && mod) {
+        afb_req_fail_f(request, "ucmget-labels", "SndCard devid=[%s] name=[%s] UCM mod+dev incompatible", queryValues.devid, cardName);
+        goto OnErrorExit;
+    }
+
+    // device selection is handle as a modifier
+    if (dev) mod = dev;
+
+    const char *labels = afb_req_value(request, "value");
+    if (!labels) {
+        afb_req_fail_f(request, "ucmget-labels", "SndCard devid=[%s] name=[%s] UCM values name missing", queryValues.devid, cardName);
+        goto OnErrorExit;
+    }
+
+    json_object *jLabels = json_tokener_parse(labels);
+    if (!jLabels) {
+        afb_req_fail_f(request, "ucmget-notjson", "labels=%s not a valid json entry", labels);
+        goto OnErrorExit;
+    };
+
+    enum json_type jtype = json_object_get_type(jLabels);
+    switch (jtype) {
+            json_object *tmpJ;
+
+        case json_type_array:
+            labelCount = json_object_array_length(jLabels);
+            break;
+
+        case json_type_string:
+            tmpJ = json_object_new_array();
+            labelCount = 1;
+            json_object_array_add(tmpJ, jLabels);
+            jLabels = tmpJ;
+            break;
+
+        default:
+            afb_req_fail_f(request, "ucmget-notarray", "labels=%s not valid JSON array", labels);
+            goto OnErrorExit;
+    }
+
+    for (int idx = 0; idx < labelCount; idx++) {
+        json_object *jValue, *jLabel;
+        const char *label;
+
+        jLabel = json_object_array_get_idx(jLabels, idx);
+        label = json_object_get_string(jLabel);
+        jValue = ucmGetValue(&ucmHandles[ucmIdx], verb, mod, label);
+        if (jValue) json_object_object_add(jResponse, label, jValue);
+        else {
+            json_object_array_add(jWarnings, jLabel);
+        }
+    }
+
+    // use info section to notified not found values label
+    if (json_object_array_length(jWarnings) > 0) {
+        json_object *tmpJ = json_object_new_object();
+        json_object_object_add(tmpJ, "no-context", jWarnings);
+        warnings = json_object_get_string(tmpJ);
+    }
+    afb_req_success(request, jResponse, warnings);
+
+OnErrorExit:
+    return;
+}
+
+PUBLIC void alsaUseCaseSet(struct afb_req request) {
+    int err, ucmIdx;
+    queryValuesT queryValues;
+    json_object *jResponse = json_object_new_object();
+
+    json_object *queryJ = alsaCheckQuery(request, &queryValues);
+    if (!queryJ) goto OnErrorExit;
+
+
+    ucmIdx = alsaUseCaseOpen(request, &queryValues, TRUE);
+    if (ucmIdx < 0) goto OnErrorExit;
+
+    snd_use_case_mgr_t *ucmMgr = ucmHandles[ucmIdx].ucm;
+    const char *cardName = ucmHandles[ucmIdx].cardName;
+
+    const char *verb = afb_req_value(request, "verb");
+    const char *mod = afb_req_value(request, "mod");
+    const char *dev = afb_req_value(request, "dev");
+    // Known identifiers: _verb - set current verb = value _enadev - enable given device = value _disdev - disable given device = value _swdev/{old_device} - new_device = value
+
+    if (verb) {
+        err = snd_use_case_set(ucmMgr, "_verb", verb);
+        if (err) {
+            afb_req_fail_f(request, "ucmset-verb", "SndCard devid=[%s] name=[%s] Invalid UCM verb=[%s] err=%s", queryValues.devid, cardName, verb, snd_strerror(err));
+            goto OnErrorExit;
+        }
+    }
+
+    if (dev) {
+        err = snd_use_case_set(ucmMgr, "_enadev", dev);
+        if (err) {
+            afb_req_fail_f(request, "ucmset-dev", "SndCard devid=[%s] name=[%s] Invalid UCMverb=[%s] dev=%s err=%s", queryValues.devid, cardName, verb, dev, snd_strerror(err));
+            goto OnErrorExit;
+        }
+    }
+
+    if (mod) {
+        err = snd_use_case_set(ucmMgr, "_enamod", mod);
+        if (err) {
+            afb_req_fail_f(request, "ucmset-mod", "SndCard devid=[%s] name=[%s] Invalid UCM verb=[%s] mod=[%s] err=%s", queryValues.devid, cardName, verb, mod, snd_strerror(err));
+            goto OnErrorExit;
+        }
+    }
+
+    // label are requested transfert request to get
+    if (afb_req_value(request, "value")) return alsaUseCaseGet(request);
+
+    if (queryValues.mode <= 3) {
+        json_object *jValue;
+
+        jValue = ucmGetValue(&ucmHandles[ucmIdx], verb, dev, "OutputDspName");
+        if (jValue) json_object_object_add(jResponse, "OutputDspName", jValue);
+
+        jValue = ucmGetValue(&ucmHandles[ucmIdx], verb, dev, "PlaybackPCM");
+        if (jValue) json_object_object_add(jResponse, "PlaybackPCM", jValue);
+
+        jValue = ucmGetValue(&ucmHandles[ucmIdx], verb, mod, "CapturePCM");
+        if (jValue) json_object_object_add(jResponse, "CapturePCM", jValue);
+    }
+    afb_req_success(request, jResponse, NULL);
+
+OnErrorExit:
+    return;
+}
+
+PUBLIC void alsaUseCaseReset(struct afb_req request) {
+    int err, ucmIdx;
+    queryValuesT queryValues;
+
+    json_object *queryJ = alsaCheckQuery(request, &queryValues);
+    if (!queryJ) goto OnErrorExit;
+
+    ucmIdx = alsaUseCaseOpen(request, &queryValues, FALSE);
+    if (ucmIdx < 0) goto OnErrorExit;
+
+    err = snd_use_case_mgr_reset(ucmHandles[ucmIdx].ucm);
+    if (err) {
+        afb_req_fail_f(request, "ucmreset-fail", "devid=%s Card Name=%s", queryValues.devid, ucmHandles[ucmIdx].cardName);
+        goto OnErrorExit;
+    }
+
+    afb_req_success(request, NULL, NULL);
+
+OnErrorExit:
+    return;
+}
+
+PUBLIC void alsaUseCaseClose(struct afb_req request) {
+    int err, ucmIdx;
+    queryValuesT queryValues;
+
+    json_object *queryJ = alsaCheckQuery(request, &queryValues);
+    if (!queryJ) goto OnErrorExit;
+
+    ucmIdx = alsaUseCaseOpen(request, &queryValues, FALSE);
+    if (ucmIdx < 0) goto OnErrorExit;
+
+    err = snd_use_case_mgr_close(ucmHandles[ucmIdx].ucm);
+    if (err) {
+        afb_req_fail_f(request, "ucmreset-close", "devid=%s Card Name=%s", queryValues.devid, ucmHandles[ucmIdx].cardName);
+        goto OnErrorExit;
+    }
+
+    // do not forget to release sound card name string
+    free(ucmHandles[ucmIdx].cardName);
+
+    afb_req_success(request, NULL, NULL);
+
+OnErrorExit:
+    return;
+}
+
+
diff --git a/Alsa-afb/CMakeLists.txt b/Alsa-afb/CMakeLists.txt
new file mode 100644
index 0000000..876e837
--- /dev/null
+++ b/Alsa-afb/CMakeLists.txt
@@ -0,0 +1,41 @@
+###########################################################################
+# Copyright 2015, 2016, 2017 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.
+###########################################################################
+
+# Add target to project dependency list
+PROJECT_TARGET_ADD(alsa-lowlevel)
+
+    # Define project Targets
+    ADD_LIBRARY(${TARGET_NAME} MODULE Alsa-ApiHat.c  Alsa-SetGet.c  Alsa-Ucm.c Alsa-AddCtl.c Alsa-RegEvt.c)
+
+    # Binder exposes a unique public entry point
+    SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES
+	PREFIX "afb-"
+        LABELS "BINDING"
+	LINK_FLAGS  ${BINDINGS_LINK_FLAG}
+        OUTPUT_NAME ${TARGET_NAME}
+    )
+
+    # Library dependencies (include updates automatically)
+    TARGET_LINK_LIBRARIES(${TARGET_NAME} 
+        audio-common 
+        ${link_libraries}
+    )
+
+    # installation directory
+    INSTALL(TARGETS ${TARGET_NAME}
+        LIBRARY DESTINATION ${BINDINGS_INSTALL_DIR})
diff --git a/Alsa-afb/README.md b/Alsa-afb/README.md
new file mode 100644
index 0000000..93d2d4d
--- /dev/null
+++ b/Alsa-afb/README.md
@@ -0,0 +1,33 @@
+------------------------------------------------------------------------
+   AlsaCore Low level binding maps AlsaLib APIs
+------------------------------------------------------------------------
+
+Testing: (from project directory bindings)
+ * start binder:  ~/opt/bin/afb-daemon --ldpaths=./build --token=mysecret --roothttp=htdocs
+ * connect browser on http://localhost:1234?devid=hw:0
+
+ # List Avaliable Sound cards
+ http://localhost:1234/api/alsacore/getinfo
+
+ # Get Info on a given Sound Card
+ http://localhost:1234/api/alsacore/getinfo?devid=hw:0
+
+ # Get shortname/longname for a given card
+ http://localhost:1234/api/alsacore/getcardid?devid=hw:0
+
+ # Get all controls from a given sound card
+ http://localhost:1234/api/alsacore/getctl?devid=hw:0
+
+ # Get detail on a given control (optional mode=0=verbose,1,2)
+ http://localhost:1234/api/alsacore/getctl?devid=hw:0&numid=1&mode=0
+
+# Debug event with afb-client-demo
+```
+ ~/opt/bin/afb-client-demo localhost:1234/api?token=mysecret
+ alsacore subscribe {"devid":"hw:0"}
+```
+
+# Open AlsaMixer and play with Volume
+```
+ alsamixer -D hw:0
+```