HARK Document : HarkParamsDynReconf

6.7.4 HarkParamsDynReconf

6.7.4.1 Outline of the node

To reconfigure the parameters of LocalizeMUSIC , SourceTracker , and HRLE dynamically during execution of a network, this node subscribes parameters of the three modules through socket communication and passes the parameter to the three modules.

6.7.4.2 Necessary file

None.

6.7.4.3 Usage

When to use

This node is used when wishing to reconfigure parameters of LocalizeMUSIC , SourceTracker , and HRLE dynamically while executing a network.

Typical connection

Figure 6.92 shows the usage example of HarkParamsDynReconf node.

$\includegraphics[width=.8\textwidth ]{fig/modules/HarkParamsDynReconf}$

Figure 6.92: Connection example of HarkParamsDynReconf

LocalizeMUSIC , SourceTracker , and HRLE in Figure 6.92 have the PARAMS input terminals that are not displayed by the default. Figure 6.93 shows how to add the invisible input terminal PARAMS.

$\includegraphics[width=\linewidth ]{fig/modules/HarkParamsDynReconf_input1}$
Step 1: Right-click the node and “Add Input”

$\includegraphics[width=\linewidth ]{fig/modules/HarkParamsDynReconf_input2}$
Step 2: Input “PARAMS” in the “Name” form. Click “Add”.

$\includegraphics[width=\linewidth ]{fig/modules/HarkParamsDynReconf_input3}$
Step 3: PARAMS input terminal is added to the node

Figure 6.93: Adding a invisible input terminal PARAMS

6.7.4.4 Input-output and property of the node

Input

No inputs.

Output

LocalizeMUSIC: : Vector<ObjectRef> type. This outputs the parameters of LocalizeMUSIC . This should be connected to the PARAMS input terminal of LocalizeMUSIC .
SourceTracker: : Vector<ObjectRef> type. This outputs the parameters of SourceTracker . This should be connected to the PARAMS input terminal of SourceTracker .
HRLE: : Vector<ObjectRef> type. This outputs the parameters of HRLE . This should be connected to the PARAMS input terminal of HRLE .

Parameter

Table 6.75: Parameter list of HarkParamsDynReconf

Parameter name	Type	Default value	Unit	Description
PORT	`int`			Port number for the socket connection
ENABLE_DEBUG	`bool`	`false`		Enable debug output

PORT: : int type. This parameter defines the port number for socket communication.
ENABLE_DEBUG: : bool type. If true, the debug message is printed to the standard output.

6.7.4.5 Details of the node

This node works as a server of a non-blocking socket communication and subscribes parameters of LocalizeMUSIC , SourceTracker , and HRLE from a client program. After receiving the new parameters, this node sends the parameter to the three nodes.

The subscribed data should be a float type vector with the size 12, denoted as buff[12] hereinafter. If the current frame receives new parameters, the parameters are updated. If not, the parameters keep the previous ones.

The received data, buff[12], is decoded as follows and sent to the next nodes.

NUM_SOURCE (LocalizeMUSIC ) : (int)buff[0]
MIN_DEG (LocalizeMUSIC ) : (int)buff[1]
MAX_DEG (LocalizeMUSIC ) : (int)buff[2]
LOWER_BOUND_FREQUENCY (LocalizeMUSIC ) : (int)buff[3]
UPPER_BOUND_FREQUENCY (LocalizeMUSIC ) : (int)buff[4]
THRESH (SourceTracker ) : (float)buff[5]
PAUSE_LENGTH (SourceTracker ) : (float)buff[6]
MIN_SRC_INTERVAL (SourceTracker ) : (float)buff[7]
MIN_TFINDEX_INTERVAL (SourceTracker ) : (float)buff[8]
COMPARE_MODE (SourceTracker ) : (Source::CompareMode)buff[9]
LX (HRLE ) : (float)buff[10]
TIME_CONSTANT (HRLE ) : (int)buff[11]

This node supports the reconnection of client programs.

Here is an example of a client program written in python.

#!/usr/bin/python
import socket
import struct

HOST = ’localhost’    # The remote host
PORT = 9999           # The same port as used by the server

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((HOST, PORT))
buff = [2.0, -180.0, 180.0, 500.0, 2800.0, 30.0, 800.0, 20.0, 6.0, 0.0, 0.85, 16000.0]
msg = struct.pack("f"*len(buff), *buff)
sock.send(msg)

sock.close()