1 files changed, 252 insertions, 0 deletions
diff --git a/AlsaSound/HALayer/Shared/SharedHalLib.c b/AlsaSound/HALayer/Shared/SharedHalLib.c
new file mode 100644
index 0000000..ffa25e0
--- /dev/null
+++ b/AlsaSound/HALayer/Shared/SharedHalLib.c
@@ -0,0 +1,252 @@
+/*
+ * 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 <json-c/json.h>
+#include <afb/afb-binding.h>
+#include <afb/afb-service-itf.h>
+
+#include "MiscHelpers.h"
+#include "AlsaHalIface.h"
+
+typdef struct {
+    int numid;
+} shareHallMap_T;
+
+static struct afb_service srvitf;
+static const struct afb_binding_interface *afbIface;
+static shareHallMap_T *shareHallMap;
+
+
+STATIC void localping(struct afb_req request) {
+    json_object *query = afb_req_json(request);
+    afb_req_success(request, query, NULL); 
+}
+
+// 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;
+    
+}
+
+// this is call when after all bindings are loaded
+STATIC int halGetControl(struct afb_service service) {
+    srvitf = service;
+    struct json_object *queryin, *queryout, *ctls, *devid;
+
+    // get query from request
+    queryin = afb_req_json(request);
+
+    // check devid was given
+    devid= json_object_object_get(queryin,"devid");
+    if (!ctls) {
+        afb_req_fail_f(request, "devid-notfound", "No DevID given query=[%s]", json_object_get_string(queryin));
+        goto OnErrorExit;
+    }
+    
+    // loop on requested controls
+    ctls= json_object_object_get(queryin,"ctls");
+    if (!ctls || json_object_array_length(ctls) <= 0) {
+        afb_req_fail_f(request, "ctls-notfound", "No Controls given query=[%s]", json_object_get_string(queryin));
+        goto OnErrorExit;
+    }
+    
+    for (int idx=0; idx< json_object_array_length(ctls), idx++) {
+        struct json_object *ctl;
+        halControlEnumT control;
+        int value;
+        
+        // each controls should be halControlEnumT+value
+        ctl = json_object_array_get_idx(ctls, idx);
+        if (json_object_array_length(ctl != 2)) {
+            afb_req_fail_f(request, "ctl-invalid", "Invalid Control devid=%s ctl=[%s]"json_object_get_string(devid), json_object_get_string(cls)); 
+            goto OnErrorExit;                     
+        }
+        
+        // As HAL and Business logic use the same AlsaMixerHal.h direct conversion is not an issue
+        control = (halControlEnumT)json_object_get_int(json_object_array_get_idx(ctl,0));
+        value   = json_object_get_int(json_object_array_get_idx(ctl,0));
+        
+        if (control >= EndHalCrlTag || control <= StartHalCrlTag) {
+            afb_req_fail_f(request, "ctl-invalid", "Invalid Control devid=%s ctl=[%s] should be [%d=%d]"
+                          , json_object_get_string(devid), json_object_get_string(cls)), StartHalCrlTag, EndHalCrlTag; 
+            goto OnErrorExit;                                 
+        }
+        
+ 
+            default:
+          NOTICE (afbIface, "audioLogicOpenCB2 unknown HAL control=[%s]", json_object_get_string(ctl)):
+        }       
+    }
+    
+    
+    // register HAL with Alsa Low Level Binder devid=hw:0&numid=1&quiet=0
+    queryurl=json_object_new_object();
+    json_object_object_add(queryurl, "prefix",json_object_new_string(alsaHalBinding.v1.prefix));
+    json_object_object_add(queryurl, "name"  ,json_object_new_string(alsaHalSndCard.name));
+    afb_service_call(srvitf, "alsacore",  "registerHal", queryurl, halGetControlCB, queryurl);
+    
+ 
+    afb_req_success (request, sndctrls, NULL);
+    return;
+    
+OnErrorExit:
+        
+};
+
+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) {
+    srvitf = service;
+    struct json_object *queryurl;
+    
+    // API prefix is used as sndcard halname
+   alsaHalBinding.v1.prefix= prefix;
+    
+    // register HAL with Alsa Low Level Binder
+    queryurl=json_object_new_object();
+    json_object_object_add(ctx->queryurl, "prefix",json_object_new_string(alsaHalBinding.v1.prefix));
+    json_object_object_add(ctx->queryurl, "name"  ,json_object_new_string(alsaHalSndCard.name));
+    afb_service_call(srvitf, "alsacore",  "registerHal", queryurl, halInitCB, NULL);
+
+    return 0;
+};
+
+
+// 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= localping,    .info= "Ping Binding" },
+  { .name= "getcontrol", .session= AFB_SESSION_NONE, .callback= halGetControl,.info= "Get Control" },
+  { .name= "setvolume",  .session= AFB_SESSION_NONE, .callback= halSetVol,    .info= "Set Volume" },
+  { .name= "getvolume",  .session= AFB_SESSION_NONE, .callback= halGetVol,    .info= "Get Volume" },
+  { .name= "subscribe",  .session= AFB_SESSION_NONE, .callback= halSubscribe, .info= "Subscribe AudioBinding Events" },
+  { .name= NULL } /* marker for end of the array */
+};
+
+// Process HAL mapping from alsaHalSndCardT before registering HAL binder
+PUBLIC const struct afb_binding *afbBindingV1Register(const struct afb_binding_interface *itf) {
+    int count;
+    afbIface= itf;                     // need to keep a static trace of binder interface for avances functions
+    alsaHalBinding.verbs=halSharedApi; // complete sndcard specific alsaHalBinding with standard HAL APIs
+    alsaHalCtlMapT  *alsaHalCtls = MapalsaHalSndCard.alsaHalCtlsMap; // Get sndcard specific HAL control mapping
+    
+    if (alsaHalCtls == NULL) {
+        ERROR (afbIface, "afbBindingV1Register Fail alsaHalCtlsMap==NULL");
+        return NULL;
+    }
+    
+    // Create a zone to store HAL high/low level mapping
+    shareHallMap = calloc (EndHalCrlTag * sizeof(shareHallMap_T));
+    for (int idx= 0; alsaHalCtlsMap[idx].numid != 0; idx++) {
+        shareHallMap[alsaHalCtlsMap[idx].]->numid  = alsaHalCtlsMap[idx].numid;
+    }
+    
+    return alsaHalBinding;	/* returns the description of the binding */
+}