SA-MP Mobile

#define FILTERSCRIPT // This is to define the script as a FS
#include <a_samp>
#include <zcmd>
#include <sscanf2>
#include <foreach>

#define MAX_DYNAMIC_CARS 500 // If this isn't already in your script, add it

enum VehicleSirenInfo
{
	EmergencyCopSiren
}

new VehicleInfo[MAX_DYNAMIC_CARS][VehicleSirenInfo];

// If a player moves out of the area, the siren will turn off (not fade out), and if they enter the zone with the siren again, it'll
// start the siren audio over again.

stock InAreaWithCopSiren(playerid) // This is to check if a player is in the area with the siren audio
{
	new Float:x, Float:y, Float:z;
	for(new i = 0; i < MAX_DYNAMIC_CARS; i ++)
	{
		GetVehiclePos(i, x, y, z);
		if(IsPlayerInRangeOfPoint(playerid, 100.0, x, y, z))
		{
			if(VehicleInfo[i][EmergencyCopSiren] != 0)
			{
				SetPVarFloat(playerid, "CopSirenX", x);
				SetPVarFloat(playerid, "CopSirenY", y);
				SetPVarFloat(playerid, "CopSirenZ", z);
				return 1;
			}
		}
	}
	return false;
}

public OnPlayerUpdate(playerid)
{
	if(InAreaWithCopSiren(playerid))
	{
			if(!GetPVarInt(playerid, "CopSiren"))
			{
				SetPVarInt(playerid,"CopSiren", 1);
				new link[128];
				format(link, 128, "https://falcon-host.org/uploads/siren.mp3"); // This is the siren which I made and merged, but you can change it.
				PlayAudioStreamForPlayer(playerid, link, GetPVarFloat(playerid, "CopSirenX"), GetPVarFloat(playerid, "CopSirenY"), GetPVarFloat(playerid, "CopSirenZ"), 100.0 , 0);
			}
	}
	else
	{
		if(GetPVarInt(playerid, "CopSiren") != 0)
		{
			DeletePVar(playerid, "CopSiren");
			StopAudioStreamForPlayer(playerid);
		}
	}
	return 1;
}

// This is mandatory because if several emergency cars are in the area at the same time, and the player disconnects, the siren will be turned off.
// It is also added to prevent bugs from occurring, to restart the server over and over.
public OnPlayerDisconnect(playerid, reason)
{											
	if(IsPlayerInAnyVehicle(playerid))
	{
		new Float:x, Float:y, Float:z;
		new VehicleID = GetPlayerVehicleID(playerid);
		if(VehicleInfo[VehicleID][EmergencyCopSiren] != 0)
		{
			GetVehiclePos(VehicleID, x, y, z);
			VehicleInfo[VehicleID][EmergencyCopSiren] = 0;
			foreach(new i : Player)
			{
				if(IsPlayerInRangeOfPoint(i, 100.0, x, y, z))
				{
					if(GetPVarInt(i, "CopSiren") != 0) 
                                        {
						StopAudioStreamForPlayer(i);
						SetPVarInt(i, "CopSiren", 0);
					}
				}
			}
		}
	}
	return 1;
}

public OnVehicleDeath(vehicleid, killerid)
{
	if(VehicleInfo[vehicleid][EmergencyCopSiren] != 0)
	{ 
		new Float:x, Float:y, Float:z;
		GetVehiclePos(vehicleid, x, y, z);
		foreach(new i : Player)
		{
			if(IsPlayerInRangeOfPoint(i, 100.0, x, y, z))
			{
				if(GetPVarInt(i,"CopSiren") != 0)
				{
					StopAudioStreamForPlayer(i);
					SetPVarInt(i, "CopSiren", 0);
				}
			}
		}
		VehicleInfo[vehicleid][EmergencyCopSiren] = 0;
	}
	return 1;
}

// This is the command to be used: /siren on = turns on the siren, and /siren off = turns it off.
CMD:siren(playerid, params[])
{
	new Float:x, Float:y, Float:z, VehicleID, option[16];
	if(sscanf(params, "s[16]", option))
	{
		SendClientMessage(playerid, 0xFF6347FF, "Usage: /siren [parameter]");
		SendClientMessage(playerid, 0xFF6347FF, "Parameters: {FFFFFF}on, off");
		return true;
	}
	if(strcmp(option, "on", true) == 0)
	{
		VehicleID = GetPlayerVehicleID(playerid);
		GetVehiclePos(VehicleID, x, y, z);
		new link[128];
		format(link, 128, "https://falcon-host.org/uploads/siren.mp3");
		foreach(new i : Player)
		{
			if(IsPlayerInRangeOfPoint(i, 100.0, x, y, z))
			{
				PlayAudioStreamForPlayer(i, link, x, y, z, 100.0, 0);
				SetPVarInt(i, "CopSiren", 1);
			}
		}
		VehicleInfo[VehicleID][EmergencyCopSiren] = 1; // 1 = true
	}
	if(strcmp(option, "off", true) == 0)
	{
		VehicleID = GetPlayerVehicleID(playerid);
		GetVehiclePos(VehicleID, x, y, z);
		foreach(new i : Player)
		{
			if(IsPlayerInRangeOfPoint(i, 100.0, x, y, z))
			{
				if(GetPVarInt(i,"CopSiren") != 0)
				{
					StopAudioStreamForPlayer(i);
					SetPVarInt(i, "CopSiren", 0);
				}
			}
		}
		VehicleInfo[VehicleID][EmergencyCopSiren] = 0; // 0 = not true
	}
	return 1;
}