Open Source Toolkit Documentation:

The MITRE Audio Echo Server

The audio echo server is designed to test audio devices by routing incoming audio broker connections to outgoing audio broker connections. It currently handles 8-bit and 16-bit broker data.

• Status
• Usage
• Message set
• Messages issued
• Known bugs

Status

History and plans

This server is thread-safe, so make thread should work (used for CATS audio example).

Version history

• 1.0 on 1/25/02
• 1.1 on 9/13/02

Usage

Command line

Default port

Command line arguments

This server also accepts the standard server arguments. See the command-line argument parsing library in the Galaxy Communicator documentation for details.

Message set

• handle_audio_data

handle_audio_data establishes an incoming broker connection and copies the broker data to an outgoing broker connection. At the moment, it only handles binary (8-bit) and 16-bit audio data. It supports compatibility with the MIT playbox control protocol.
 

	parameter	type	optional	depends on	description/constraints
IN:	:audio_host	string	yes		host of the outgoing audio broker, if not using broker proxies
	:audio_port	integer	yes		port of the outgoing audio broker, if not using broker proxies
	:call_id	string	yes		call ID of the outgoing audio broker, if not using broker proxies
	:audio_proxy	proxy	yes		proxy object encapsulating broker information, if using broker proxies
	:batch	integer	yes		if 1, save the audio until the outgoing broker is done and then set up the return broker. If 0 or not present, set up the return broker immediately and relay audio as it arrives.
	:mit_playbox_protocol	integer	yes		If 1, use the MIT playbox control protocol on input and output
	:sample_rate	integer	yes		Sample rate of the incoming audio. The server does nothing with the value besides include it in the return broker announcement.
	:encoding_format	string	yes		Encoding format of the incoming audio. The server does nothing with the value besides include it in the return broker announcement.
	:logfile	string	yes		Pathname of file for storing raw audio data for this message.

This message returns a frame.

Messages issued

{c FromEcho
   :synth_host <string: host of return broker, if incoming broker was not a proxy>
   :synth_port <integer: port of return broker, if incoming broker was not a proxy>
   :call_id <string: call ID of return broker, if incoming broker was not a proxy>
   :synth_proxy <proxy: untyped proxy stream for data, if incoming broker was a proxy>
   :sample_rate <integer: sample rate reported by incoming broker, if present>
   :encoding_format <string: encoding format reported by incoming broker, if present>
}

Known bugs