//
// libtgvoip is free and unencumbered public domain software.
// For more information, see http://unlicense.org or the UNLICENSE file
// you should have received with this source code distribution.
//

#include <cstddef>
#include "OpenSLEngineWrapper.h"
#include "../../logging.h"

#define CHECK_SL_ERROR(res, msg) if(res!=SL_RESULT_SUCCESS){ LOGE(msg); return NULL; }

using namespace tgvoip;
using namespace tgvoip::audio;


SLObjectItf OpenSLEngineWrapper::sharedEngineObj=NULL;
SLEngineItf OpenSLEngineWrapper::sharedEngine=NULL;
int OpenSLEngineWrapper::count=0;

void OpenSLEngineWrapper::DestroyEngine(){
	count--;
	LOGI("release: engine instance count %d", count);
	if(count==0){
		(*sharedEngineObj)->Destroy(sharedEngineObj);
		sharedEngineObj=NULL;
		sharedEngine=NULL;
	}
	LOGI("after release");
}

SLEngineItf OpenSLEngineWrapper::CreateEngine(){
	count++;
	if(sharedEngine)
		return sharedEngine;
	const SLInterfaceID pIDs[1] = {SL_IID_ENGINE};
	const SLboolean pIDsRequired[1]  = {SL_BOOLEAN_TRUE};
	SLresult result = slCreateEngine(&sharedEngineObj, 0, NULL, 1, pIDs, pIDsRequired);
	CHECK_SL_ERROR(result, "Error creating engine");

	result=(*sharedEngineObj)->Realize(sharedEngineObj, SL_BOOLEAN_FALSE);
	CHECK_SL_ERROR(result, "Error realizing engine");

	result = (*sharedEngineObj)->GetInterface(sharedEngineObj, SL_IID_ENGINE, &sharedEngine);
	CHECK_SL_ERROR(result, "Error getting engine interface");
	return sharedEngine;
}