Mobile Art && Code

I am here at CMU in Pittsburgh at a conference called Mobile Art && Code. Great talks, great workshops, glad I came.

I am doing a workshop called Interactive Telephony for New Media Arts, here is the full set of notes.

One thing that I did for the workshop is a put together an Asterisk driven webservice in PHP for getting at live phone call data. If you have been working projects that get information from asterisk or use phone calls to control other applications, it might be worth checking out.

PHP AGI Script:

#!/usr/bin/php -q
<?PHP
require('/var/lib/asterisk/agi-bin/phpagi.php');

$agi = new AGI();

$agi->stream_file("vm-extension");
$return = $agi->wait_for_digit(10000);
while ($return['result'] > 0)
{
        $ascii = chr($return['result']);
        $agi->say_number($ascii);
        file_put_contents("/var/www/html/webservice/data.txt",time() . "," . $agi->request["agi_uniqueid"] . "," . $agi->request["agi_callerid"] . "," . $ascii . "\n",FILE_APPEND);
        $return = $agi->wait_for_digit(100000);
}
?>

PHP Web Service Script:

<?
	// The client will send a timestamp if it want's new stuff from the timestamp
	$timestamp = 0;
	if (isset($_GET['ts']))
	{
		$timestamp = $_GET['ts'];
	}

	$data = file_get_contents("data.txt");
	$dataarray = explode("\n",$data);
	if ($timestamp > 0)
	{
		// Send everything from the timestamp forward
		for ($i = sizeof($dataarray) - 10; $i < sizeof($dataarray); $i++)
		{
			$currentline = explode(",",$dataarray[$i]);
			if (sizeof($currentline) > 0)
			{
				if ($currentline[0] > $timestamp)
				{
					echo($dataarray[$i]."\n");
				}
			}
		}
	}
	else
	{
		// Just send the last one
		if (sizeof($dataarray) > 1)
		{
			echo($dataarray[sizeof($dataarray)-2]);
		}
	}
?>

Processing Example

I should note that this was built very quickly and therefore somewhat buggy. I don’t think the Processing example is thread safe and the PHP should really be using a database.. Also, the Processing example is a riff off of something Dan Shiffman put together for getting Asterisk and Processing to talk through a Java server.