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-rw-r--r--ALSA-afb/AlsaCtlSetGet.c1084
1 files changed, 1084 insertions, 0 deletions
diff --git a/ALSA-afb/AlsaCtlSetGet.c b/ALSA-afb/AlsaCtlSetGet.c
new file mode 100644
index 0000000..a41e390
--- /dev/null
+++ b/ALSA-afb/AlsaCtlSetGet.c
@@ -0,0 +1,1084 @@
+/*
+ * 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)
+
+*/
+
+#define _GNU_SOURCE // needed for vasprintf
+
+#include <alsa/asoundlib.h>
+#include "AlsaCoreBinding.h"
+#include <systemd/sd-event.h>
+
+
+
+// use to store crl numid user request
+typedef struct {
+ unsigned int numId;
+ json_object *jToken;
+ json_object *jValues;
+ int used;
+} ctlRequestT;
+
+// generic sndctrl event handle hook to event callback when pooling
+typedef struct {
+ struct pollfd pfds;
+ sd_event_source *src;
+ snd_ctl_t *ctlDev;
+ int quiet;
+ struct afb_event afbevt;
+} evtHandleT;
+
+typedef struct {
+ int ucount;
+ int cardId;
+ evtHandleT *evtHandle;
+} sndHandleT;
+
+typedef struct {
+ char *apiprefix;
+ char *shortname;
+}cardRegistryT;
+
+cardRegistryT *cardRegistry[MAX_SND_CARD+1];
+
+PUBLIC void NumidsListParse (queryValuesT *queryValues, ctlRequestT *ctlRequest) {
+ json_object *jValues;
+ int length;
+
+ for (int idx=0; idx < queryValues->count; idx ++) {
+ ctlRequest[idx].jToken = json_object_array_get_idx (queryValues->jNumIds, idx);
+ ctlRequest[idx].jValues = NULL;
+ ctlRequest[idx].used=0;
+
+ enum json_type jtype=json_object_get_type(ctlRequest[idx].jToken);
+ switch (jtype) {
+ json_object *jId, *jVal;
+
+ 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);
+ 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);
+ if (length < 1 || length >2) {
+ ctlRequest[idx].used=-1;
+ continue;
+ }
+
+ ctlRequest[idx].numId =json_object_get_int(json_object_array_get_idx (ctlRequest[idx].jToken, 0));
+
+ if (length == 2) {
+ jValues = json_object_array_get_idx (ctlRequest[idx].jToken, 1);
+ if (jValues == NULL) {
+ ctlRequest[idx].used=-1;
+ continue;
+ }
+ // Value is an int or an array with potentially multiple subvalues
+ ctlRequest[idx].jValues = jValues;
+ }
+ 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",&jVal)) {
+ NOTICE (afbIface,"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);
+ ctlRequest[idx].jValues =jVal;
+ }
+
+
+ default:
+ ctlRequest[idx].used=-1;
+ }
+ }
+}
+
+PUBLIC int alsaCheckQuery (struct afb_req request, queryValuesT *queryValues) {
+
+ queryValues->devid = afb_req_value(request, "devid");
+ if (queryValues->devid == NULL) goto OnErrorExit;
+ const char *numids;
+ json_object *jNumIds;
+
+ const char *rqtQuiet = afb_req_value(request, "quiet");
+ if (!rqtQuiet) queryValues->quiet=99; // default super quiet
+ else if (rqtQuiet && ! sscanf (rqtQuiet, "%d", &queryValues->quiet)) {
+ json_object *query = afb_req_json(request);
+
+ afb_req_fail_f (request, "quiet-notinteger","Query=%s Quiet not integer &quiet=%s&", json_object_to_json_string(query), rqtQuiet);
+ goto OnErrorExit;
+ };
+
+ // no NumId is interpreted as ALL for get and error for set
+ numids = afb_req_value(request, "numids");
+ if (numids == NULL) {
+ queryValues->count=0;
+ goto OnExit;
+ }
+
+ jNumIds = json_tokener_parse(numids);
+ if (!jNumIds) {
+ afb_req_fail_f (request, "numids-notjson","numids=%s not a valid json entry", numids);
+ goto OnErrorExit;
+ };
+
+ enum json_type jtype= json_object_get_type(jNumIds);
+ switch (jtype) {
+ case json_type_array:
+ queryValues->jNumIds = jNumIds;
+ queryValues->count = json_object_array_length (jNumIds);
+ break;
+
+ case json_type_int:
+ queryValues->count = 1;
+ queryValues->jNumIds = json_object_new_array ();
+ json_object_array_add (queryValues->jNumIds, jNumIds);
+ break;
+
+ default:
+ afb_req_fail_f (request, "numid-notarray","NumId=%s NumId not valid JSON array", numids);
+ goto OnErrorExit;
+ }
+
+OnExit:
+ return 0;
+
+OnErrorExit:
+ return 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) {
+ 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);
+ 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) {
+ snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
+ json_object_array_add(arrayJson, json_object_new_string(label));
+ size -= (unsigned int) sizeof (unsigned int);
+ }
+ json_object_object_add(dbscaleJson, "array", arrayJson);
+ } else {
+ 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));
+ }
+ 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) {
+ snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
+ json_object_array_add(arrayJson, json_object_new_string(label));
+ size -= (unsigned int) sizeof (unsigned int);
+ }
+ json_object_object_add(dbLinearJson, "offset", arrayJson);
+ } else {
+ json_object_object_add(dbLinearJson, "min", DB2StringJsonOject((int) tlv[2]));
+ json_object_object_add(dbLinearJson, "max", DB2StringJsonOject((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) {
+ snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
+ json_object_array_add(arrayJson, json_object_new_string(label));
+ size -= (unsigned int) sizeof (unsigned int);
+ }
+ json_object_object_add(dbRangeJson, "dbrange", arrayJson);
+ break;
+ }
+ while (size > 0) {
+ json_object * embedJson = json_object_new_object();
+ snprintf(label, sizeof (label), "%i,", tlv[idx++]);
+ json_object_object_add(embedJson, "rangemin", json_object_new_string(label));
+ snprintf(label, sizeof (label), "%i", tlv[idx++]);
+ json_object_object_add(embedJson, "rangemax", json_object_new_string(label));
+ embedJson = decodeTlv(tlv + idx, 4 * sizeof (unsigned int));
+ 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) {
+ snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
+ json_object_array_add(arrayJson, json_object_new_string(label));
+ size -= (unsigned int) sizeof (unsigned int);
+ }
+ json_object_object_add(dbMinMaxJson, "array", arrayJson);
+
+ } else {
+ json_object_object_add(dbMinMaxJson, "min", DB2StringJsonOject((int) tlv[2]));
+ json_object_object_add(dbMinMaxJson, "max", DB2StringJsonOject((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) {
+ INFO (afbIface, "SndCard [%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);
+ WARNING (afbIface, "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 (afbIface->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));
+ INFO (afbIface, "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 (struct 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
+STATIC 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;
+
+ // 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) {
+ NOTICE (afbIface, "Fail to load ALSA NUMID=%d Values=[%s]", ctlRequest->numId, json_object_to_json_string(ctlRequest->jValues));
+ goto OnErrorExit;
+ }
+
+ snd_ctl_elem_info_get_id(elemInfo, elemId); // map ctlInfo to ctlId elemInfo is updated !!!
+ if (!snd_ctl_elem_info_is_writable(elemInfo)) {
+ NOTICE (afbIface, "Not Writable ALSA NUMID=%d Values=[%s]", ctlRequest->numId, json_object_to_json_string(ctlRequest->jValues));
+ goto OnErrorExit;
+ }
+
+ count = snd_ctl_elem_info_get_count (elemInfo);
+ if (count == 0) goto OnErrorExit;
+
+ enum json_type jtype= json_object_get_type(ctlRequest->jValues);
+ switch (jtype) {
+ case json_type_array:
+ length = json_object_array_length (ctlRequest->jValues);
+ valueIsArray=1;
+ break;
+ case json_type_int:
+ length=1;
+ valueIsArray=0;
+ break;
+ default:
+ count =0;
+ break;
+ }
+
+
+ if (count == 0 || count < length) {
+ NOTICE (afbIface, "Invalid values NUMID='%d' Values='%s' count='%d' wanted='%d'", ctlRequest->numId, json_object_to_json_string(ctlRequest->jValues), 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 < length; index++) {
+ json_object *element;
+ int value;
+
+ if (valueIsArray) element= json_object_array_get_idx(ctlRequest->jValues, index);
+ else element= ctlRequest->jValues;
+
+ 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) {
+ NOTICE (afbIface, "Fail to write ALSA NUMID=%d Values=[%s] Error=%s", ctlRequest->numId, json_object_to_json_string(ctlRequest->jValues), snd_strerror(err));
+ goto OnErrorExit;
+ }
+
+ ctlRequest->used=1;
+ return 0;
+
+ OnErrorExit:
+ ctlRequest->used=-1;
+ return -1;
+}
+
+// process ALSA control and store then into ctlRequest
+STATIC int alsaGetSingleCtl (snd_ctl_t *ctlDev, snd_ctl_elem_id_t *elemId, ctlRequestT *ctlRequest, int quiet) {
+ 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); // map ctlInfo to ctlId elemInfo is updated !!!
+ if (snd_ctl_elem_info(ctlDev, elemInfo) < 0) goto OnErrorExit;
+ count = snd_ctl_elem_info_get_count (elemInfo);
+ if (count == 0) goto OnErrorExit;
+
+ snd_ctl_elem_info_get_id(elemInfo, elemId); // map ctlInfo to ctlId elemInfo is updated !!!
+ 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); // map ctlInfo to ctlId elemInfo is updated !!!
+ if (snd_ctl_elem_read(ctlDev, elemData) < 0) goto OnErrorExit;
+
+ int numid= snd_ctl_elem_info_get_numid(elemInfo);
+
+ ctlRequest->jValues= json_object_new_object();
+ json_object_object_add (ctlRequest->jValues,"id" , json_object_new_int(numid));
+ if (quiet < 2) json_object_object_add (ctlRequest->jValues,"name" , json_object_new_string(snd_ctl_elem_id_get_name (elemId)));
+ if (quiet < 1) json_object_object_add (ctlRequest->jValues,"iface" , json_object_new_string(snd_ctl_elem_iface_name(snd_ctl_elem_id_get_interface(elemId))));
+ if (quiet < 3) json_object_object_add (ctlRequest->jValues,"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->jValues,"val",jsonValuesCtl);
+
+ if (!quiet) { // in simple mode do not print usable values
+ json_object *jsonClassCtl = json_object_new_object();
+ json_object_object_add (jsonClassCtl,"type" , json_object_new_string(snd_ctl_elem_type_name(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->jValues,"ctrl", jsonClassCtl);
+ json_object_object_add (ctlRequest->jValues,"acl" , getControlAcl (elemInfo));
+
+ // check for tlv [direct port from amixer.c]
+ if (snd_ctl_elem_info_is_tlv_readable(elemInfo)) {
+ unsigned int *tlv;
+ tlv = malloc(4096);
+ if ((err = snd_ctl_elem_info(ctlDev, elemInfo)) < 0) {
+ fprintf (stderr, "Control %s element TLV read error\n", snd_strerror(err));
+ free(tlv);
+ } else {
+ json_object_object_add (ctlRequest->jValues,"tlv", decodeTlv (tlv, 4096));
+ }
+ }
+ }
+ ctlRequest->used=1;
+ return 0;
+
+ OnErrorExit:
+ ctlRequest->used=-1;
+ return -1;
+}
+
+// assign multiple control to the same value
+PUBLIC void alsaSetGetCtls (struct afb_req request, ActionSetGetT action) {
+ ctlRequestT *ctlRequest;
+ const char *warmsg=NULL;
+ int err=0, status=0;
+ unsigned int ctlCount;
+ snd_ctl_t *ctlDev;
+ snd_ctl_elem_list_t *ctlList;
+ json_object *sndctls=json_object_new_array();;
+ queryValuesT queryValues;
+
+ err = alsaCheckQuery (request, &queryValues);
+ if (err) 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 (&queryValues, ctlRequest);
+ }
+
+ // 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) {
+ NOTICE (afbIface,"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.quiet);
+ break;
+
+ case ACTION_SET:
+ err = alsaSetSingleCtl (ctlDev, elemId, &ctlRequest[jdx]);
+
+ default:
+ err = 1;
+ }
+ if (err) status++;
+ else {
+ json_object_array_add (sndctls, ctlRequest[jdx].jValues);
+ }
+ }
+ }
+
+ // if we had error let's add them into response message info
+ json_object *warnings = json_object_new_array();
+ for (int jdx=0; jdx < queryValues.count; jdx++) {
+ if (ctlRequest[jdx].used <= 0) {
+ json_object *failctl = json_object_new_object();
+ json_object_object_add (failctl, "numid", ctlRequest[jdx].jToken);
+ if (ctlRequest[jdx].jValues)
+ json_object_object_add(failctl, "values", ctlRequest[jdx].jValues);
+
+ if (ctlRequest[jdx].numId == -1) json_object_object_add (failctl, "info", json_object_new_string ("Invalid NumID"));
+ else {
+ if (ctlRequest[jdx].used == 0) json_object_object_add (failctl, "info", json_object_new_string ("Does Not Exist"));
+ if (ctlRequest[jdx].used == -1) json_object_object_add (failctl, "info", json_object_new_string ("Invalid Value"));
+ }
+ json_object_array_add (warnings, failctl);
+ }
+ /* WARNING!!!! Check with Jose why following put free jValues
+ if (ctlRequest[jdx].jToken) json_object_put(ctlRequest[jdx].jToken);
+ if (ctlRequest[jdx].jValues) json_object_put(ctlRequest[jdx].jValues);
+ */
+ }
+
+ if (json_object_array_length(warnings)) warmsg=json_object_to_json_string_ext(warnings, JSON_C_TO_STRING_PLAIN);
+ else json_object_put(warnings);
+
+ // send response+warning if any
+ afb_req_success (request, sndctls, warmsg);
+ snd_ctl_elem_list_clear(ctlList);
+
+ OnErrorExit:
+ return;
+}
+
+PUBLIC void alsaGetCtls (struct afb_req request) {
+ alsaSetGetCtls (request, ACTION_GET);
+}
+
+PUBLIC void alsaSetCtls (struct afb_req request) {
+ alsaSetGetCtls (request, ACTION_SET);
+}
+
+
+// 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;
+ evtHandleT *evtHandle = (evtHandleT*)userData;
+ snd_ctl_event_t *eventId;
+ json_object *ctlEventJ;
+ unsigned int mask;
+ int iface;
+ int device;
+ int subdev;
+ const char*devname;
+ ctlRequestT ctlRequest;
+ snd_ctl_elem_id_t *elemId;
+
+ if ((revents & EPOLLHUP) != 0) {
+ NOTICE (afbIface, "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->quiet);
+ if (err) goto OnErrorExit;
+
+ iface = snd_ctl_event_elem_get_interface(eventId);
+ device = snd_ctl_event_elem_get_device(eventId);
+ subdev = snd_ctl_event_elem_get_subdevice(eventId);
+ devname= snd_ctl_event_elem_get_name(eventId);
+
+ // proxy ctlevent as a binder event
+ ctlEventJ = json_object_new_object();
+ json_object_object_add(ctlEventJ, "device" ,json_object_new_int (device));
+ json_object_object_add(ctlEventJ, "subdev" ,json_object_new_int (subdev));
+ if (evtHandle->quiet < 2) {
+ json_object_object_add(ctlEventJ, "iface" ,json_object_new_int (iface));
+ json_object_object_add(ctlEventJ, "devname",json_object_new_string (devname));
+ }
+ if (ctlRequest.jValues) (json_object_object_add(ctlEventJ, "values" ,ctlRequest.jValues));
+ DEBUG(afbIface, "sndCtlEventCB=%s", json_object_get_string(ctlEventJ));
+ afb_event_push(evtHandle->afbevt, ctlEventJ);
+
+ }
+
+ ExitOnSucess:
+ return 0;
+
+ OnErrorExit:
+ WARNING (afbIface, "sndCtlEventCB: ignored unsupported event type");
+ return (0);
+}
+
+// Subscribe to every Alsa CtlEvent send by a given board
+PUBLIC void alsaSubcribe (struct afb_req request) {
+ static sndHandleT sndHandles[MAX_SND_CARD];
+ evtHandleT *evtHandle;
+ snd_ctl_t *ctlDev;
+ int err, idx, cardId, idxFree=-1;
+ snd_ctl_card_info_t *cardinfo;
+ queryValuesT queryValues;
+
+
+ err = alsaCheckQuery (request, &queryValues);
+ if (err) goto OnErrorExit;
+
+
+ // 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=%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==%devent name=%s", idx);
+ goto OnErrorExit;
+ }
+
+ evtHandle = malloc (sizeof(evtHandleT));
+ evtHandle->ctlDev = ctlDev;
+ evtHandle->quiet = queryValues.quiet;
+ 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(afbIface->daemon), &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 (afbIface->daemon, 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, err);
+ 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
+PUBLIC void alsaGetCardId (struct afb_req request) {
+ char devid [10];
+ const char *devname, *shortname, *longname;
+ int card, err, index, idx;
+ json_object *respJson;
+ 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);
+ devname = 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, devname)) 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
+ respJson = json_object_new_object();
+ json_object_object_add(respJson, "index" ,json_object_new_int (index));
+ json_object_object_add(respJson, "devid" ,json_object_new_string (devid));
+ json_object_object_add(respJson, "shortname" ,json_object_new_string (shortname));
+ json_object_object_add(respJson, "longname" ,json_object_new_string (longname));
+
+ // search for a HAL binder card mapping name to api prefix
+ for (idx=0; idx < MAX_SND_CARD; idx++) {
+ if (!strcmp (cardRegistry[idx]->shortname, shortname)) break;
+ }
+ // if a match if found, then we have an HAL for this board let's return its value
+ if (idx < MAX_SND_CARD) json_object_object_add(respJson, "halapi",json_object_new_string (cardRegistry[idx]->apiprefix));
+
+ afb_req_success(request, respJson, NULL);
+ return;
+
+ OnErrorExit:
+ return;
+}
+
+// Register loaded HAL with board Name and API prefix
+PUBLIC void alsaRegisterHal (struct afb_req request) {
+ static int index=0;
+ 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, "name");
+ 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;
+ }
+
+ cardRegistry[index]= malloc (sizeof(cardRegistry));
+ cardRegistry[index]->apiprefix=strdup(apiPrefix);
+ cardRegistry[index]->shortname=strdup(shortname);
+ index++;cardRegistry[index]=NULL;
+
+ // when OK nothing to return
+ afb_req_success(request, NULL, NULL);
+ return;
+
+ OnErrorExit:
+ return;
+}
+