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-rw-r--r--AlsaSound/HALayer/SharedHal/SharedHalLib.c341
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diff --git a/AlsaSound/HALayer/SharedHal/SharedHalLib.c b/AlsaSound/HALayer/SharedHal/SharedHalLib.c
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+/*
+ * 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.
+ *
+ * reference:
+ * amixer contents; amixer controls;
+ * http://www.tldp.org/HOWTO/Alsa-sound-6.html
+ */
+#define _GNU_SOURCE // needed for vasprintf
+#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 "SharedHalLib.h"
+
+typedef struct {
+ int index;
+ int numid;
+} shareHallMap_T;
+
+static struct afb_service srvitf;
+static const struct afb_binding_interface *afbIface;
+static shareHallMap_T *shareHallMap;
+
+// Force specific HAL to depend on ShareHalLib
+PUBLIC char* SharedHalLibVersion="1.0";
+
+// This callback when api/alsacore/subscribe returns
+STATIC void alsaSubcribeCB(void *handle, int iserror, struct json_object *result) {
+ struct afb_req request = afb_req_unstore(handle);
+ struct json_object *x, *resp = NULL;
+ const char *info = NULL;
+
+ if (result) {
+ INFO(afbIface, "result=[%s]\n", json_object_to_json_string(result));
+ if (json_object_object_get_ex(result, "request", &x) && json_object_object_get_ex(x, "info", &x))
+ info = json_object_get_string(x);
+ if (!json_object_object_get_ex(result, "response", &resp)) resp = NULL;
+ }
+
+ // push message respond
+ if (iserror) afb_req_fail_f(request, "Fail", info);
+ else afb_req_success(request, resp, info);
+
+ // free calling request
+ afb_req_unref(request);
+}
+
+// Create and subscribe to alsacore ctl events
+
+STATIC void halMonitor(struct afb_req request) {
+
+ // save request in session as it might be used after return by callback
+ struct afb_req *handle = afb_req_store(request);
+
+ // push request to low level binding
+ if (!handle) afb_req_fail(request, "error", "out of memory");
+ else afb_service_call(srvitf, "alsacore", "subctl", json_object_get(afb_req_json(request)), alsaSubcribeCB, handle);
+
+ // success/failure messages return from callback
+}
+
+// Subscribe to AudioBinding events
+
+STATIC void halSubscribe(struct afb_req request) {
+ const char *devid = afb_req_value(request, "devid");
+ if (devid == NULL) {
+ afb_req_fail_f(request, "devid-missing", "devid=hw:xxx missing");
+ }
+}
+
+// Call when all bindings are loaded and ready to accept request
+
+STATIC void halGetVol(struct afb_req request) {
+
+ // Should call here Hardware Alsa Abstraction Layer for corresponding Sound Card
+ afb_req_success(request, NULL, NULL);
+ return;
+
+}
+
+STATIC void halSetVol(struct afb_req request) {
+ const char *arg;
+ const char *pcm;
+
+ arg = afb_req_value(request, "vol");
+ if (arg == NULL) {
+ afb_req_fail_f(request, "argument-missing", "vol=[0,100] missing");
+ goto OnErrorExit;
+ }
+
+ pcm = afb_req_value(request, "pcm");
+ if (pcm == NULL) pcm = "Master";
+
+ // Should call here Hardware Alsa Abstraction Layer for corresponding Sound Card
+ afb_req_success(request, NULL, NULL);
+ return;
+
+OnErrorExit:
+ return;
+
+}
+
+// AudioLogic expect volume values to be 0-100%
+
+STATIC int NormaliseValue(const alsaHalCtlMapT *halCtls, int valuein) {
+ int valueout;
+
+ if (valuein > halCtls->maxval) valuein= halCtls->maxval;
+ if (valuein < halCtls->minval) valuein= halCtls->minval;
+
+ // volume are ajusted to 100% any else is ignored
+ switch (halCtls->group) {
+ case OUTVOL:
+ case PCMVOL:
+ case INVOL:
+ valueout = (valuein * 100) / (halCtls->maxval - halCtls->minval);
+ break;
+ default:
+ valueout = valuein;
+ }
+ return (valueout);
+}
+
+// receive controls for LowLevel remap them to hight level before returning them
+
+STATIC void halGetControlCB(void *handle, int iserror, struct json_object *result) {
+ alsaHalMapT *halCtls = alsaHalSndCard.ctls;
+ struct json_object *response;
+
+ // retrieve request and check for errors
+ struct afb_req request = afb_req_unstore(handle);
+ if (!cbCheckResponse(request, iserror, result)) goto OnExit;
+
+ // Get response from object
+ json_object_object_get_ex(result, "response", &response);
+ if (!response) {
+ afb_req_fail_f(request, "response-notfound", "No Controls return from alsa/getcontrol result=[%s]", json_object_get_string(result));
+ goto OnExit;
+ }
+
+ // extract sounds controls information from received Object
+ struct json_object *ctls;
+ json_object_object_get_ex(result, "ctls", &ctls);
+ if (!ctls) {
+ afb_req_fail_f(request, "ctls-notfound", "No Controls return from alsa/getcontrol response=[%s]", json_object_get_string(response));
+ goto OnExit;
+ }
+
+ // make sure return controls have a valid type
+ if (json_object_get_type(ctls) != json_type_array) {
+ afb_req_fail_f(request, "ctls-notarray", "Invalid Controls return from alsa/getcontrol response=[%s]", json_object_get_string(response));
+ goto OnExit;
+ }
+
+ // loop on array and store values into client context
+ for (int idx = 0; idx < json_object_array_length(ctls); idx++) {
+ struct json_object *ctl;
+ int rawvalue, numid;
+
+ ctl = json_object_array_get_idx(ctls, idx);
+ if (json_object_array_length(ctl) != 2) {
+ afb_req_fail_f(request, "ctl-invalid", "Invalid Control return from alsa/getcontrol ctl=[%s]", json_object_get_string(ctl));
+ goto OnExit;
+ }
+
+ // As HAL and Business logic use the same AlsaMixerHal.h direct conversion is not an issue
+ numid = (halCtlsEnumT) json_object_get_int(json_object_array_get_idx(ctl, 0));
+ rawvalue = json_object_get_int(json_object_array_get_idx(ctl, 1));
+
+ for (int idx = 0; halCtls[idx].alsa.numid != 0; idx++) {
+ if (halCtls[idx].alsa.numid == numid) {
+ struct json_object *ctlAndValue = json_object_new_array();
+ json_object_array_add(ctlAndValue, json_object_new_int(idx)); // idx == high level control
+ json_object_array_add(ctlAndValue, json_object_new_int(NormaliseValue(&halCtls[idx].alsa, rawvalue)));
+ break;
+ }
+ }
+ if (shareHallMap[idx].numid == 0) {
+
+ afb_req_fail_f(request, "ctl-invalid", "Invalid Control numid from alsa/getcontrol ctl=[%s]", json_object_get_string(ctl));
+ goto OnExit;
+ }
+ }
+
+ OnExit:
+ return;
+}
+
+
+// Translate high level control to low level and call lower layer
+STATIC void halGetCtls(struct afb_req request) {
+
+ struct json_object *queryin, *queryout, *ctlsin, *devid;
+ struct json_object *ctlsout = json_object_new_array();
+
+ // get query from request
+ queryin = afb_req_json(request);
+
+ // check devid was given
+ if (!json_object_object_get_ex (queryin, "devid", &devid)) {
+ afb_req_fail_f(request, "devid-notfound", "No DevID given query=[%s]", json_object_get_string(queryin));
+ goto OnExit;
+ }
+
+ // loop on requested controls
+ if (!json_object_object_get_ex(queryin, "ctls", &ctlsin) || json_object_array_length(ctlsin) <= 0) {
+ afb_req_fail_f(request, "ctlsin-notfound", "No Controls given query=[%s]", json_object_get_string(queryin));
+ goto OnExit;
+ }
+
+ // loop on controls
+ for (int idx = 0; idx < json_object_array_length(ctlsin); idx++) {
+ struct json_object *ctl;
+ halCtlsEnumT control;
+
+ // each control should be halCtlsEnumT
+ ctl = json_object_array_get_idx(ctlsin, idx);
+ control = (halCtlsEnumT) json_object_get_int(ctl);
+ if (control >= EndHalCrlTag || control <= StartHalCrlTag) {
+ afb_req_fail_f(request, "ctl-invalid", "Invalid Control devid=%s sndcard=%s ctl=[%s] should be [%d-%d]"
+ , json_object_get_string(devid), alsaHalSndCard.name, json_object_get_string(ctl), StartHalCrlTag, EndHalCrlTag);
+ goto OnExit;
+ }
+
+ // add corresponding lowlevel numid to querylist
+ json_object_array_add(ctlsout, json_object_new_int(shareHallMap[control].numid));
+ }
+
+ // register HAL with Alsa Low Level Binder devid=hw:0&numid=1&quiet=0
+ queryout = json_object_new_object();
+ json_object_object_add(queryout, "devid", devid);
+ json_object_object_add(queryout, "ctls", ctlsout);
+
+ // save request context dans call lowlevel API
+ struct afb_req *handle = afb_req_store(request);
+ afb_service_call(srvitf, "alsacore", "getctl", queryout, halGetControlCB, handle);
+
+OnExit:
+ // Under normal situation success/failure is set from callback
+ return;
+};
+
+STATIC void halInitCB(void *handle, int iserror, struct json_object *result) {
+ struct json_object *queryurl = (json_object*) handle;
+
+ if (iserror) NOTICE(afbIface, "halInitCB: registration alsaHAL query=[%s] Fail", json_object_to_json_string(queryurl));
+ else DEBUG(afbIface, "halInitCB: registration alsaHAL card=[%s] Success", json_object_to_json_string(queryurl));
+}
+
+// This receive all event this binding subscribe to
+PUBLIC void afbBindingV1ServiceEvent(const char *evtname, struct json_object *object) {
+
+ NOTICE(afbIface, "afbBindingV1ServiceEvent evtname=%s [msg=%s]", evtname, json_object_to_json_string(object));
+}
+
+// this is call when after all bindings are loaded
+PUBLIC int afbBindingV1ServiceInit(struct afb_service service) {
+ int rc=0;
+ srvitf = service;
+ struct json_object *queryurl;
+
+ if (alsaHalSndCard.initCB) {
+ rc= (alsaHalSndCard.initCB) (afbIface, service);
+ if (rc != 0) goto OnExit;
+ }
+
+ // register HAL with Alsa Low Level Binder
+ queryurl = json_object_new_object();
+ json_object_object_add(queryurl, "prefix", json_object_new_string(alsaHalSndCard.prefix));
+ json_object_object_add(queryurl, "name", json_object_new_string(alsaHalSndCard.name));
+ afb_service_call(srvitf, "alsacore", "registerHal", queryurl, halInitCB, NULL);
+
+ OnExit:
+ return (rc);
+};
+
+// Every HAL export the same API & Interface Mapping from SndCard to AudioLogic is done through alsaHalSndCardT
+static const struct afb_verb_desc_v1 halSharedApi[] = {
+ /* VERB'S NAME SESSION MANAGEMENT FUNCTION TO CALL SHORT DESCRIPTION */
+ { .name = "ping", .session = AFB_SESSION_NONE, .callback = pingtest, .info = "Ping Binding"},
+ { .name = "getctls", .session = AFB_SESSION_NONE, .callback = halGetCtls, .info = "Get Control"},
+ { .name = "setvol", .session = AFB_SESSION_NONE, .callback = halSetVol, .info = "Set Volume"},
+ { .name = "getvol", .session = AFB_SESSION_NONE, .callback = halGetVol, .info = "Get Volume"},
+ { .name = "subscribe", .session = AFB_SESSION_NONE, .callback = halSubscribe,.info = "Subscribe Alsa Events"},
+ { .name = "monitor", .session = AFB_SESSION_NONE, .callback = halMonitor ,.info = "Monitor Alsa Events"},
+ { .name = NULL} /* marker for end of the array */
+};
+
+
+static struct afb_binding alsaHalBinding = {
+ /* description conforms to VERSION 1 */
+ .type= AFB_BINDING_VERSION_1,
+ .v1= {
+ .prefix= NULL,
+ .info = NULL,
+ .verbs = halSharedApi,
+ }
+};
+
+// Process HAL mapping from alsaHalSndCardT before registering HAL binder
+PUBLIC const struct afb_binding *afbBindingV1Register(const struct afb_binding_interface *itf) {
+
+ afbIface = itf; // need to keep a static trace of binder interface for avances functions
+ // alsaHalBinding.v1.verbs = halSharedApi; // complete sndcard specific alsaHalBinding with standard HAL APIs
+ alsaHalMapT *halCtls = alsaHalSndCard.ctls; // Get sndcard specific HAL control mapping
+
+ if (halCtls == NULL) {
+ ERROR(afbIface, "afbBindingV1Register Fail alsaHalCtlsMap==NULL");
+ return NULL;
+ }
+
+ // Create a zone to store HAL high/low level mapping
+ shareHallMap = malloc(EndHalCrlTag * sizeof (shareHallMap_T));
+ for (int idx = 0; (halCtls[idx].alsa.numid != 0 || halCtls[idx].cb.callback != NULL); idx++) {
+ if (halCtls[idx].alsa.numid == 0) halCtls[idx].alsa.numid =-1;
+ shareHallMap[halCtls[idx].alsa.control].numid = halCtls[idx].alsa.numid;
+ }
+
+ alsaHalBinding.v1.prefix= alsaHalSndCard.prefix;
+ alsaHalBinding.v1.info = alsaHalSndCard.info;
+ return &alsaHalBinding; /* returns the description of the binding */
+};