/*
* 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 */
}