path: root/src/4a-internals-hal/4a-internals-hal-cb.c

/*
 * Copyright (C) 2018 "IoT.bzh"
 * Author Jonathan Aillet <jonathan.aillet@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 <wrap-json.h>

#include <afb/afb-binding.h>

#include "4a-hal-utilities-data.h"

#include "4a-internals-hal-cb.h"
#include "4a-internals-hal-alsacore-link.h"
#include "4a-internals-hal-mixer-link.h"
#include "4a-internals-hal-value-handler.h"

/*******************************************************************************
 *	Internals HAL Event handler function				       *
 ******************************************************************************/

void InternalHalDispatchApiEvent(afb_api_t apiHandle, const char *evtLabel, json_object *eventJ)
{
	int numid, idx = 0, cardidx;

	CtlConfigT *ctrlConfig;
	CtlSourceT source;

	struct HalData *currentHalData;
	struct InternalHalAlsaMapT *currentHalAlsaCtlsT;

	json_object *valuesJ, *normalizedValuesJ;

	AFB_API_DEBUG(apiHandle, "Evtname=%s [msg=%s]", evtLabel, json_object_get_string(eventJ));

	ctrlConfig = (CtlConfigT *) afb_api_get_userdata(apiHandle);
	if(! ctrlConfig) {
		AFB_API_ERROR(apiHandle, "Can't get current internal hal controller config");
		return;
	}

	currentHalData = (struct HalData *) getExternalData(ctrlConfig);
	if(! currentHalData) {
		AFB_API_WARNING(apiHandle, "Can't get current internal hal controller data");
		return;
	}

	// Extract sound card index from event
	while(evtLabel[idx] != '\0' && evtLabel[idx] != ':')
		idx++;

	if(evtLabel[idx] != '\0' &&
	   sscanf(&evtLabel[idx + 1], "%d", &cardidx) == 1 &&
	   currentHalData->sndCardId == cardidx) {
		if(wrap_json_unpack(eventJ, "{s:i s:o !}", "id", &numid, "val", &valuesJ)) {
			AFB_API_ERROR(apiHandle, "Invalid Alsa Event label=%s value=%s", evtLabel, json_object_get_string(eventJ));
			return;
		}

		currentHalAlsaCtlsT = currentHalData->internalHalData->alsaMapT;

		// Search for corresponding numid in ALSA controls list, if found, launch callback (if available)
		for(idx = 0; idx < currentHalAlsaCtlsT->ctlsCount; idx++) {
			if(currentHalAlsaCtlsT->ctls[idx].ctl.numid == numid) {
				if(currentHalAlsaCtlsT->ctls[idx].action) {
					source.uid = currentHalAlsaCtlsT->ctls[idx].action->uid;
					source.api = currentHalAlsaCtlsT->ctls[idx].action->api;
					source.request = NULL;

					(void) ActionExecOne(&source, currentHalAlsaCtlsT->ctls[idx].action, valuesJ);
				}
				else {
					AFB_API_NOTICE(apiHandle,
						       "The alsa control id '%i' is corresponding to a known control but without any action registered",
						       numid);
				}

				if(! currentHalAlsaCtlsT->ctls[idx].alsaControlEvent ||
				   InternalHalConvertJsonValues(apiHandle,
								&currentHalAlsaCtlsT->ctls[idx].ctl.alsaCtlProperties,
								valuesJ,
								&normalizedValuesJ,
								CONVERSION_ALSACORE_TO_NORMALIZED) ||
				   (afb_event_push(currentHalAlsaCtlsT->ctls[idx].alsaControlEvent, normalizedValuesJ) < 0)) {
					AFB_API_ERROR(apiHandle,
						      "Couldn't generate an event for known halmap %s (alsa control id %i)",
						      currentHalAlsaCtlsT->ctls[idx].uid,
						      currentHalAlsaCtlsT->ctls[idx].ctl.numid);
				}

				return;
			}
		}

		AFB_API_WARNING(apiHandle,
				"Alsacore event with an unrecognized numid: %i, evtname=%s [msg=%s]",
				numid,
				evtLabel,
				json_object_get_string(eventJ));

		return;
	}

	AFB_API_INFO(apiHandle,
		     "Not an alsacore event '%s' [msg=%s]",
		     evtLabel,
		     json_object_get_string(eventJ));

	CtrlDispatchApiEvent(apiHandle, evtLabel, eventJ);
}

/*******************************************************************************
 *	Internals HAL - 'halmixer' section parsing/handling functions	       *
 ******************************************************************************/

int InternalHalHalMixerConfig(afb_api_t apiHandle, CtlSectionT *section, json_object *MixerJ)
{
	int err = 0;

	CtlConfigT *ctrlConfig;
	struct HalData *currentHalData;

	if(! apiHandle || ! section)
		return -1;

	ctrlConfig = (CtlConfigT *) afb_api_get_userdata(apiHandle);
	if(! ctrlConfig)
		return -2;

	currentHalData = (struct HalData *) getExternalData(ctrlConfig);
	if(! currentHalData)
		return -3;

	if(MixerJ) {
		if(json_object_is_type(MixerJ, json_type_object))
			currentHalData->internalHalData->halMixerJ = MixerJ;
		else
			return -4;

		if(wrap_json_unpack(MixerJ, "{s:s}", "mixerapi", &currentHalData->internalHalData->mixerApiName))
			return -5;

		wrap_json_unpack(MixerJ, "{s?:s}", "prefix", &currentHalData->internalHalData->prefix);
	}
	else if(currentHalData->status == HAL_STATUS_AVAILABLE) {
		err = InternalHalAttachToMixer(apiHandle);
		if(err) {
			AFB_API_ERROR(apiHandle, "Error %i while attaching to mixer", err);
			return -6;
		}
	}

	return 0;
}

/*******************************************************************************
 *	Internals HAL - 'halmap' section parsing/handling functions	       *
 ******************************************************************************/

int InternalHalProcessOneHalMapObject(afb_api_t apiHandle, struct InternalHalAlsaMap *alsaMap, json_object *AlsaMapJ)
{
	char *action = NULL, *typename = NULL;

	json_object *alsaJ = NULL, *createAlsaCtlJ = NULL;

	AFB_API_DEBUG(apiHandle, "AlsaMapJ=%s", json_object_get_string(AlsaMapJ));

	if(wrap_json_unpack(AlsaMapJ, "{s:s s?:s s:o s?:s !}",
				      "uid", &alsaMap->uid,
				      "info", &alsaMap->info,
				      "alsa", &alsaJ,
				      "action", &action)) {
		AFB_API_ERROR(apiHandle, "Parsing error, map should only contains [label]|[uid]|[tag]|[info]|[alsa]|[action] in : '%s'", json_object_get_string(AlsaMapJ));
		return -1;
	}

	if(wrap_json_unpack(alsaJ, "{s?:s s?:i s?:i s?:o !}",
				   "name", &alsaMap->ctl.name,
				   "numid", &alsaMap->ctl.numid,
				   "value", &alsaMap->ctl.value,
				   "create", &createAlsaCtlJ)) {
		AFB_API_ERROR(apiHandle, "Parsing error, alsa json should only contains [name]|[numid]||[value]|[create] in : '%s'", json_object_get_string(alsaJ));
		return -2;
	}

	if(createAlsaCtlJ) {
		alsaMap->ctl.alsaCtlCreation = &alsaMap->ctl.alsaCtlProperties;

		if(wrap_json_unpack(createAlsaCtlJ,
				    "{s:s s:i s:i s:i s:i !}",
				    "type", &typename,
				    "count", &alsaMap->ctl.alsaCtlCreation->count,
				    "minval", &alsaMap->ctl.alsaCtlCreation->minval,
				    "maxval", &alsaMap->ctl.alsaCtlCreation->maxval,
				    "step", &alsaMap->ctl.alsaCtlCreation->step)) {
			AFB_API_ERROR(apiHandle, "Parsing error, alsa creation json should only contains [type]|[count]|[minval]|[maxval]|[step] in : '%s'", json_object_get_string(alsaJ));
			return -3;
		}

		if(typename) {
			alsaMap->ctl.alsaCtlCreation->type = InternalHalMapsAlsaTypeToEnum(typename);
			if(alsaMap->ctl.alsaCtlCreation->type == SND_CTL_ELEM_TYPE_NONE) {
				AFB_API_ERROR(apiHandle,
					      "Couldn't get alsa type from string %s in : '%s'",
					      typename,
					      json_object_get_string(alsaJ));
				return -4;
			}
		}

		if(! alsaMap->ctl.name)
			alsaMap->ctl.name = (char *) alsaMap->uid;
	}
	else if(alsaMap->ctl.name && alsaMap->ctl.numid > 0) {
		AFB_API_ERROR(apiHandle,
			      "Can't have both a control name (%s) and a control uid (%i) in alsa object : '%s'",
			      alsaMap->ctl.name,
			      alsaMap->ctl.numid,
			      json_object_get_string(alsaJ));
		return -5;
	}
	else if(! alsaMap->ctl.name && alsaMap->ctl.numid <= 0) {
		AFB_API_ERROR(apiHandle,
			      "Need at least a control name or a control uid in alsa object : '%s'",
			      json_object_get_string(alsaJ));
		return -6;
	}

	if(action)
		alsaMap->actionJ = AlsaMapJ;

	return 0;
}

int InternalHalHandleOneHalMapObject(afb_api_t apiHandle, char *cardId, struct InternalHalAlsaMap *alsaMap)
{
	int err;

	json_object *valueJ, *convertedValueJ = NULL;

	alsaMap->alsaControlEvent = afb_api_make_event(apiHandle, alsaMap->uid);
	if(! alsaMap->alsaControlEvent) {
		AFB_API_ERROR(apiHandle,
			      "Didn't succeed to create event for current alsa control to load action using alsa object : '%s'",
			      json_object_get_string(alsaMap->actionJ));
		return -1;
	}

	if(alsaMap->ctl.alsaCtlCreation) {
		if(InternalHalCreateAlsaCtl(apiHandle, cardId, &alsaMap->ctl)) {
			AFB_API_ERROR(apiHandle, "An error happened when trying to create a new alsa control");
			return -2;
		}
	}
	else if(InternalHalUpdateAlsaCtlProperties(apiHandle, cardId, &alsaMap->ctl)) {
		AFB_API_ERROR(apiHandle, "An error happened when trying to get existing alsa control info");
		return -3;
	}

	if(alsaMap->ctl.value) {
		// TBD JAI : handle alsa controls type
		valueJ = json_object_new_int(alsaMap->ctl.value);
		if(! valueJ) {
			AFB_API_ERROR(apiHandle, "Didn't succeed to allocate ALSA control value json string");
			return -4;
		}

		err = 0;

		if(InternalHalConvertJsonValues(apiHandle, &alsaMap->ctl.alsaCtlProperties, valueJ, &convertedValueJ, CONVERSION_NORMALIZED_TO_ALSACORE)) {
			AFB_API_ERROR(apiHandle, "Error when trying to convert initiate value json '%s'", json_object_get_string(valueJ));
			err = -5;
		}
		else if(InternalHalSetAlsaCtlValue(apiHandle, cardId, alsaMap->ctl.numid, convertedValueJ)) {
			AFB_API_ERROR(apiHandle,
				      "Error while trying to set initial value on alsa control %i, device '%s', value '%s'",
				      alsaMap->ctl.numid,
				      cardId,
				      json_object_get_string(valueJ));
			err = -6;
		}

		json_object_put(valueJ);

		if(convertedValueJ)
			json_object_put(convertedValueJ);

		if(err)
			return err;
	}

	if(alsaMap->actionJ) {
		alsaMap->action = calloc(1, sizeof(CtlActionT));
		if(! alsaMap->action) {
			AFB_API_ERROR(apiHandle,
				      "Didn't succeed to allocate structure used to store action to perform"
				      "when the corresponding ALSA control is detected");
			return -7;
		}

		if(ActionLoadOne(apiHandle, alsaMap->action, alsaMap->actionJ, 0)) {
			AFB_API_ERROR(apiHandle,
				      "Didn't succeed to load action using alsa object : '%s'",
				      json_object_get_string(alsaMap->actionJ));
			return -8;
		}
	}

	if(afb_api_add_verb(apiHandle, alsaMap->uid, alsaMap->info, InternalHalActionOnAlsaCtl, (void *) alsaMap, NULL, 0, 0)) {
		AFB_API_ERROR(apiHandle,
			      "Didn't succeed to create verb for current alsa control to load action using alsa object : '%s'",
			      json_object_get_string(alsaMap->actionJ));
		return -9;
	}

	return 0;
}

int InternalHalProcessAllHalMap(afb_api_t apiHandle, json_object *AlsaMapJ, struct InternalHalAlsaMapT *currentInternalHalAlsaMapT)
{
	int idx, err = 0;

	struct InternalHalAlsaMap *ctlMaps;

	json_type alsaMapType;

	alsaMapType = json_object_get_type(AlsaMapJ);
	switch(alsaMapType) {
		case json_type_array:
			currentInternalHalAlsaMapT->ctlsCount = (unsigned int) json_object_array_length(AlsaMapJ);
			break;

		case json_type_object:
			currentInternalHalAlsaMapT->ctlsCount = 1;
			break;

		default:
			currentInternalHalAlsaMapT->ctlsCount = 0;
			currentInternalHalAlsaMapT->ctls = NULL;
			AFB_API_ERROR(apiHandle, "Content of 'halmap' section is not valid ('%s')", json_object_get_string(AlsaMapJ));
			return -1;
	}

	ctlMaps = calloc(currentInternalHalAlsaMapT->ctlsCount, sizeof(struct InternalHalAlsaMap));
	if(! ctlMaps) {
		AFB_API_ERROR(apiHandle, "Didn't succeed to allocate halmap data table");
		return -2;
	}

	for(idx = 0; idx < currentInternalHalAlsaMapT->ctlsCount; idx++)
		err += InternalHalProcessOneHalMapObject(apiHandle, &ctlMaps[idx], alsaMapType == json_type_array ? json_object_array_get_idx(AlsaMapJ, idx) : AlsaMapJ);

	currentInternalHalAlsaMapT->ctls = ctlMaps;

	return err;
}

int InternalHalHandleAllHalMap(afb_api_t apiHandle, int sndCardId, struct InternalHalAlsaMapT *currentInternalHalAlsaMapT)
{
	int idx, err = 0;

	char cardIdString[6];

	snprintf(cardIdString, 6, "hw:%i", sndCardId);

	InternalHalSubscribeToAlsaCardEvent(apiHandle, cardIdString);

	for(idx = 0; idx < currentInternalHalAlsaMapT->ctlsCount; idx++)
		err += InternalHalHandleOneHalMapObject(apiHandle, cardIdString, &currentInternalHalAlsaMapT->ctls[idx]);

	return err;
}

int InternalHalHalMapConfig(afb_api_t apiHandle, CtlSectionT *section, json_object *AlsaMapJ)
{
	CtlConfigT *ctrlConfig;
	struct HalData *currentHalData;

	ctrlConfig = (CtlConfigT *) afb_api_get_userdata(apiHandle);
	if(! ctrlConfig)
		return -1;

	currentHalData = (struct HalData *) getExternalData(ctrlConfig);
	if(! currentHalData)
		return -2;

	if(AlsaMapJ) {
		currentHalData->internalHalData->alsaMapT = calloc(1, sizeof(struct InternalHalAlsaMapT));
		if(! currentHalData->internalHalData->alsaMapT) {
			AFB_API_ERROR(apiHandle, "Didn't succeed to allocate data structure used to store halmap data table");
			return -3;
		}

		if(InternalHalProcessAllHalMap(apiHandle, AlsaMapJ, currentHalData->internalHalData->alsaMapT)) {
			AFB_API_ERROR(apiHandle, "Failed to process 'halmap' section");
			HalUtlFreeAlsaCtlsMap(currentHalData->internalHalData->alsaMapT);
			return -4;
		}
	}
	else if(currentHalData->status == HAL_STATUS_UNAVAILABLE) {
		AFB_API_WARNING(apiHandle, "Hal is unavailable, 'halmap' section data can't be handle");
		return 1;
	}
	else if(currentHalData->sndCardId < 0) {
		AFB_API_ERROR(apiHandle, "Hal alsa card id is not valid, 'halmap' section data can't be handle");
		return -5;
	}
	else if(! currentHalData->internalHalData->alsaMapT) {
		AFB_API_WARNING(apiHandle, "'halmap' section data is empty");
		return 2;
	}
	else if(! (currentHalData->internalHalData->alsaMapT->ctlsCount > 0)) {
		AFB_API_WARNING(apiHandle, "No alsa controls defined in 'halmap' section");
		return 3;
	}
	else if(InternalHalHandleAllHalMap(apiHandle, currentHalData->sndCardId, currentHalData->internalHalData->alsaMapT)) {
		AFB_API_ERROR(apiHandle, "Failed to handle 'halmap' section");
		return -6;
	}

	return 0;
}

/*******************************************************************************
 *		Internals HAL verbs functions				       *
 ******************************************************************************/

json_object *InternalHalGetJsonArrayForMixerDataTable(afb_api_t apiHandle,
						      struct InternalHalMixerData **mixerDataList,
						      enum MixerDataType dataType)
{
	int wrapRet;

	json_object *mixerDataArrayJ, *currentMixerDataJ;

	struct InternalHalMixerData *currentMixerData;

	if(! apiHandle) {
		AFB_API_ERROR(apiHandle, "Api handle is not valid");
		return NULL;
	}

	mixerDataArrayJ = json_object_new_array();
	if(! mixerDataArrayJ) {
		AFB_API_ERROR(apiHandle, "Didn't succeed to allocate requested mixer data json array");
		return NULL;
	}

	currentMixerData = *mixerDataList;
	while(currentMixerData) {
		switch(dataType) {
			case MIXER_DATA_STREAMS:
				wrapRet = wrap_json_pack(&currentMixerDataJ,
							 "{s:s s:s}",
							 "name", currentMixerData->verb,
							 "cardId", currentMixerData->streamCardId);
				break;

			case MIXER_DATA_PLAYBACKS:
			case MIXER_DATA_CAPTURES :
				wrapRet = wrap_json_pack(&currentMixerDataJ,
							 "{s:s s:s}",
							 "name", currentMixerData->verb,
							 "mixer-name", currentMixerData->verbToCall,
							 "uid", currentMixerData->streamCardId ? currentMixerData->streamCardId : "none");
				break;

			default:
				json_object_put(mixerDataArrayJ);
				return NULL;
		}

		if(wrapRet) {
			AFB_API_ERROR(apiHandle, "Didn't succeed to allocate current mixer/playbacks/captures json object");
			json_object_put(mixerDataArrayJ);
			return NULL;
		}

		json_object_array_add(mixerDataArrayJ, currentMixerDataJ);

		currentMixerData = currentMixerData->next;
	}

	return mixerDataArrayJ;
}

json_object *InternalHalGetJsonArrayForControls(afb_api_t apiHandle, struct InternalHalAlsaMapT *currentAlsaMapDataT)
{
	int wrapRet;
	unsigned int idx;

	json_object *alsaMapDataArray, *currentAlsaMapData;

	if(! apiHandle) {
		AFB_API_ERROR(apiHandle, "Can't get current internal hal api handle");
		return NULL;
	}

	if(! currentAlsaMapDataT) {
		AFB_API_ERROR(apiHandle, "Can't get Alsa map data table to handle");
		return NULL;
	}

	alsaMapDataArray = json_object_new_array();
	if(! alsaMapDataArray) {
		AFB_API_ERROR(apiHandle, "Didn't succeed to allocate ALSA controls data json array");
		return NULL;
	}

	for(idx = 0; idx < currentAlsaMapDataT->ctlsCount; idx++) {
		wrapRet = wrap_json_pack(&currentAlsaMapData,
					 "{s:s s:s}",
					 "name", currentAlsaMapDataT->ctls[idx].uid,
					 "info", currentAlsaMapDataT->ctls[idx].info ? currentAlsaMapDataT->ctls[idx].info : "none");
		if(wrapRet) {
			AFB_API_ERROR(apiHandle, "Didn't succeed to allocate current mixer/playbacks/captures json object");
			json_object_put(alsaMapDataArray);
			return NULL;
		}

		json_object_array_add(alsaMapDataArray, currentAlsaMapData);
	}

	return alsaMapDataArray;
}

void InternalHalInfo(afb_req_t request)
{
	int wrapRet;

	char *apiToCall, *returnedError = NULL, *returnedInfo = NULL;

	afb_api_t apiHandle;
	CtlConfigT *ctrlConfig;

	struct HalData *currentHalData;

	json_object *requestJson,
		    *toReturnJ = NULL,
		    *requestAnswer,
		    *streamsArray,
		    *playbacksArray,
		    *capturesArray,
		    *controlsArray;

	apiHandle = afb_req_get_api(request);
	if(! apiHandle) {
		afb_req_fail(request, "api_handle", "Can't get current internal hal api handle");
		return;
	}

	ctrlConfig = (CtlConfigT *) afb_api_get_userdata(apiHandle);
	if(! ctrlConfig) {
		afb_req_fail(request, "hal_controller_config", "Can't get current internal hal controller config");
		return;
	}

	currentHalData = (struct HalData *) getExternalData(ctrlConfig);
	if(! currentHalData) {
		afb_req_fail(request, "hal_controller_data", "Can't get current internal hal controller data");
		return;
	}

	requestJson = afb_req_json(request);
	if(! requestJson) {
		AFB_REQ_NOTICE(request, "Can't get request json");
	}
	else if(json_object_is_type(requestJson, json_type_object) && json_object_get_object(requestJson)->count > 0) {
		apiToCall = currentHalData->internalHalData->mixerApiName;
		if(! apiToCall) {
			afb_req_fail(request, "mixer_api", "Can't get mixer api");
			return;
		}

		if(InternalHalGetInfoFromMixer(apiHandle, apiToCall, requestJson, &toReturnJ, &returnedError, &returnedInfo)) {
			afb_req_fail_f(request,
				       "mixer_info",
				       "Call to mixer info verb didn't succeed with status '%s' and info '%s'",
				       returnedError ? returnedError : "not returned",
				       returnedInfo ? returnedInfo : "not returned");
			return;
		}

		afb_req_success(request, toReturnJ, "Mixer requested data");
		return;
	}

	streamsArray = InternalHalGetJsonArrayForMixerDataTable(apiHandle,
								&currentHalData->internalHalData->streamsData,
								MIXER_DATA_STREAMS);
	if(! streamsArray) {
		afb_req_fail(request, "streams_data", "Didn't succeed to generate streams data array");
		return;
	}

	playbacksArray = InternalHalGetJsonArrayForMixerDataTable(apiHandle,
								  &currentHalData->internalHalData->playbacksData,
								  MIXER_DATA_PLAYBACKS);
	if(! playbacksArray) {
		afb_req_fail(request, "playbacks_data", "Didn't succeed to generate playbacks data array");
		return;
	}

	capturesArray = InternalHalGetJsonArrayForMixerDataTable(apiHandle,
								 &currentHalData->internalHalData->capturesData,
								 MIXER_DATA_CAPTURES);
	if(! capturesArray) {
		afb_req_fail(request, "captures_data", "Didn't succeed to generate captures data array");
		return;
	}

	controlsArray = InternalHalGetJsonArrayForControls(apiHandle,
							   currentHalData->internalHalData->alsaMapT);
	if(! controlsArray) {
		afb_req_fail(request, "controls_data", "Didn't succeed to generate controls data array");
		return;
	}

	wrapRet = wrap_json_pack(&requestAnswer,
				 "{s:o s:o s:o s:o}",
				 "streams", streamsArray,
				 "playbacks", playbacksArray,
				 "captures", capturesArray,
				 "controls", controlsArray);
	if(wrapRet) {
		afb_req_fail(request,
			     "halinfo_json_object",
			     "Didn't succeed to allocate hal info response json object");
		json_object_put(streamsArray);
		json_object_put(playbacksArray);
		json_object_put(capturesArray);
		json_object_put(controlsArray);
		return;
	}

	afb_req_success(request, requestAnswer, "Requested data");
}

void InternalHalSubscribeUnsubscribe(afb_req_t request, enum SubscribeUnsubscribeType subscribeUnsubscribeType)
{
	int arrayIdx, searchIdx, count, subscriptionFound, subscriptionDoneNb = 0;

	char *currentSubscriptionString;

	afb_api_t apiHandle;
	CtlConfigT *ctrlConfig;

	struct HalData *currentHalData;
	struct InternalHalMixerData *currentStreamData;
	struct InternalHalAlsaMapT *InternalHalAlsaMapT;

	json_object *requestJson,
		    *requestedSubscriptionsJ,
		    *requestedSubscriptionJ = NULL,
		    *subscriptionDoneNbJ = NULL;
	json_type requestJsonType;

	apiHandle = afb_req_get_api(request);
	if(! apiHandle) {
		afb_req_fail(request, "api_handle", "Can't get current internal hal api handle");
		return;
	}

	ctrlConfig = (CtlConfigT *) afb_api_get_userdata(apiHandle);
	if(! ctrlConfig) {
		afb_req_fail(request, "hal_controller_config", "Can't get current internal hal controller config");
		return;
	}

	currentHalData = (struct HalData *) getExternalData(ctrlConfig);
	if(! currentHalData) {
		afb_req_fail(request, "hal_controller_data", "Can't get current internal hal controller data");
		return;
	}

	if(! currentHalData->internalHalData) {
		afb_req_fail(request, "hal_controller_data", "Current internal hal data is not valid");
		return;
	}

	InternalHalAlsaMapT = currentHalData->internalHalData->alsaMapT;

	requestJson = afb_req_json(request);
	if(! requestJson) {
		afb_req_fail(request, "request_json", "Can't get request json");
		return;
	}

	if(wrap_json_unpack(requestJson, "{s:o}", "events", &requestedSubscriptionsJ)) {
		afb_req_fail(request, "request_json", "Request json invalid");
		return;
	}

	requestJsonType = json_object_get_type(requestedSubscriptionsJ);
	switch(requestJsonType) {
		case json_type_string:
			count = 1;
			requestedSubscriptionJ = requestedSubscriptionsJ;
			break;

		case json_type_array:
			count = (int) json_object_array_length(requestedSubscriptionsJ);
			break;

		default:
			afb_req_fail(request, "request_json", "Request json invalid");
			return;
	}

	for(arrayIdx = 0; arrayIdx < count; arrayIdx++) {
		if(requestJsonType == json_type_array) {
			requestedSubscriptionJ = json_object_array_get_idx(requestedSubscriptionsJ, arrayIdx);
			if(! json_object_is_type(requestedSubscriptionJ, json_type_string)) {
				afb_req_fail_f(request, "request_json", "Request json number %i in array invalid", arrayIdx);
				return;
			}
		}

		subscriptionFound = 0;
		currentSubscriptionString = (char *) json_object_get_string(requestedSubscriptionJ);

		if(! strcasecmp(currentSubscriptionString, HAL_STREAM_UPDATES_EVENT_NAME)) {
			if(currentHalData->internalHalData->streamUpdates &&
			   subscribeUnsubscribeType == SUBSCRIPTION &&
			   afb_req_subscribe(request, currentHalData->internalHalData->streamUpdates)) {
				afb_req_fail(request,
					     "request_stream_list_updates_event",
					     "Error while trying to subscribe to stream list updates event");
					return;
			}
			else if(currentHalData->internalHalData->streamUpdates &&
				subscribeUnsubscribeType == UNSUBSCRIPTION &&
				afb_req_unsubscribe(request, currentHalData->internalHalData->streamUpdates)) {
				afb_req_fail(request,
					     "request_stream_list_updates_event",
					     "Error while trying to unsubscribe to stream list updates event");
					return;
			}

			subscriptionFound = 1;
			subscriptionDoneNb++;
		}

		currentStreamData = currentHalData->internalHalData->streamsData;
		while(currentStreamData &&
		      ! subscriptionFound) {
			if(! strcasecmp(currentSubscriptionString, currentStreamData->verb)) {
				if(currentStreamData->event &&
				   subscribeUnsubscribeType == SUBSCRIPTION &&
				   afb_req_subscribe(request, currentStreamData->event)) {
					afb_req_fail_f(request,
						       "request_stream_event",
						       "Error while trying to subscribe to %s stream events",
						       currentStreamData->verb);
					return;
				}
				else if(currentStreamData->event &&
					subscribeUnsubscribeType == UNSUBSCRIPTION &&
					afb_req_unsubscribe(request, currentStreamData->event)) {
					afb_req_fail_f(request,
						       "request_stream_event",
						       "Error while trying to unsubscribe to %s stream events",
						       currentStreamData->verb);
					return;
				}

				subscriptionFound = 1;
				subscriptionDoneNb++;
				break;
			}

			currentStreamData = currentStreamData->next;
		}

		searchIdx = 0;
		while((searchIdx < (InternalHalAlsaMapT ? InternalHalAlsaMapT->ctlsCount : 0)) &&
		      ! subscriptionFound) {
			if(! strcasecmp(currentSubscriptionString, InternalHalAlsaMapT->ctls[searchIdx].uid)) {
				if(InternalHalAlsaMapT->ctls[searchIdx].alsaControlEvent &&
				   subscribeUnsubscribeType == SUBSCRIPTION &&
				   afb_req_subscribe(request, InternalHalAlsaMapT->ctls[searchIdx].alsaControlEvent)) {
					afb_req_fail_f(request,
						       "request_control_event",
						       "Error while trying to subscribe to %s halmap controls events",
						       InternalHalAlsaMapT->ctls[searchIdx].uid);
					return;
				}
				else if(InternalHalAlsaMapT->ctls[searchIdx].alsaControlEvent &&
					subscribeUnsubscribeType == UNSUBSCRIPTION &&
					afb_req_unsubscribe(request, InternalHalAlsaMapT->ctls[searchIdx].alsaControlEvent)) {
					afb_req_fail_f(request,
						       "request_stream_event",
						       "Error while trying to unsubscribe to %s halmap controls events",
						       InternalHalAlsaMapT->ctls[searchIdx].uid);
					return;
				}

				subscriptionFound = 1;
				subscriptionDoneNb++;
				break;
			}

			searchIdx++;
		}
	}

	if(! subscriptionDoneNb) {
		afb_req_fail_f(request,
			       "events_not_found",
			       "%s failed, event(s) were not found",
			       subscribeUnsubscribeType == SUBSCRIPTION ? "Subscription" : "Unsubscription");
		return;
	}
	else {
		subscriptionDoneNbJ = json_object_new_int(subscriptionDoneNb);
		if(! subscriptionDoneNbJ) {
			afb_req_fail(request,
				     "subscriptionnb_json_integer",
				     "Didn't succeed to allocate subscription number json integer");
			return;
		}
	}

	if(subscriptionDoneNb == count)
		afb_req_success_f(request,
				  subscriptionDoneNbJ,
				  "%s succeed for all the %i events requested",
				  subscribeUnsubscribeType == SUBSCRIPTION ? "Subscription" : "Unsubscription",
				  subscriptionDoneNb);
	else if(subscriptionDoneNb < count)
		afb_req_success_f(request,
				  subscriptionDoneNbJ,
				  "%s succeed but only to %i events requested out of %i",
				  subscribeUnsubscribeType == SUBSCRIPTION ? "Subscription" : "Unsubscription",
				  subscriptionDoneNb,
				  count);
	else
		afb_req_success_f(request,
				  subscriptionDoneNbJ,
				  "%s succeed but to more events than requested (%i out of %i)",
				  subscribeUnsubscribeType == SUBSCRIPTION ? "Subscription" : "Unsubscription",
				  subscriptionDoneNb,
				  count);
}

void InternalHalSubscribe(afb_req_t request)
{
	InternalHalSubscribeUnsubscribe(request, SUBSCRIPTION);
}

void InternalHalUnsubscribe(afb_req_t request)
{
	InternalHalSubscribeUnsubscribe(request, UNSUBSCRIPTION);
}