ezdev-onvif
Version:
Client to ONVIF NVT devices Profile S: cameras
216 lines (188 loc) • 6.37 kB
JavaScript
/**
* NodeJS ONVIF PTZ and Presets Test
*
* Created by Roger Hardiman <opensource@rjh.org.uk>
*
* Read the cursor keys and send ONVIF PTZ commands to the camera
*
* There are a few challenges to reading the keyboard
* Firstly there is no 'keyup' event. So we use a Timer to schedule an ONVIF
* Stop Command to be sent after a short delay.
* If we send a new 'move' command (eg change direction or keyboard
* auto-repeat) any pending Stop commands are no longer required and are
* cleared and a new Stop command is scheduled to be sent after a short delay.
*
* Secondly we need to handle auto-repeat if a key is held down so we pause
* and resume stdin.
*
* Finally we need to use the completion callbacks for ONVIF functions
* so that we only send a new ONVIF 'move' command after the previous one has
* finished to prevent overlapping commands.
*
* The program also sends Goto Preset commands.
* The program gets a list of ONVIF presets. Keys 1..9 are used to send
* Goto Preset on the first 9 preset commands.
*
* The GetPresets command is left as an asyncronous command
* and the presets list may come in some time after the StreamURI is displayed
*
*/
var HOSTNAME = '192.168.1.128',
PORT = 80,
USERNAME = '',
PASSWORD = '',
STOP_DELAY_MS = 50;
var Cam = require('./lib/onvif').Cam;
var keypress = require('keypress');
new Cam({
hostname : HOSTNAME,
username : USERNAME,
password : PASSWORD,
port : PORT,
timeout : 10000
}, function CamFunc(err) {
if (err) {
console.log(err);
return;
}
var cam_obj = this;
var stop_timer;
var ignore_keypress = false;
var preset_names = [];
var preset_tokens = [];
cam_obj.getStreamUri({
protocol : 'RTSP'
}, // Completion callback function
// This callback is executed once we have a StreamUri
function (err, stream, xml) {
if (err) {
console.log(err);
return;
} else {
console.log('------------------------------');
console.log('Host: ' + HOSTNAME + ' Port: ' + PORT);
console.log('Stream: = ' + stream.uri);
console.log('------------------------------');
// start processing the keyboard
read_and_process_keyboard();
}
}
);
cam_obj.getPresets({}, // use 'default' profileToken
// Completion callback function
// This callback is executed once we have a list of presets
function (err, stream, xml) {
if (err) {
console.log("GetPreset Error "+err);
return;
} else {
// loop over the presets and populate the arrays
// Do this for the first 9 presets
console.log("GetPreset Reply");
var count = 1;
for(var item in stream) {
var name = item; //key
var token = stream[item]; //value
// It is possible to have a preset with a blank name so generate a name
if (name.length == 0) name='no name ('+token+')';
preset_names.push(name);
preset_tokens.push(token);
// Show first 9 preset names to user
if (count < 9) {
console.log('Press key '+count+ ' for preset "' + name + '"');
count++;
}
}
}
}
);
function read_and_process_keyboard() {
// listen for the "keypress" events
keypress(process.stdin);
process.stdin.setRawMode(true);
process.stdin.resume();
console.log('');
console.log('Use Cursor Keys to move camera. + and - to zoom. q to quit');
// keypress handler
process.stdin.on('keypress', function (ch, key) {
/* Exit on 'q' or 'Q' or 'CTRL C' */
if ((key && key.ctrl && key.name == 'c')
|| (key && key.name == 'q')) {
process.exit();
}
if (ignore_keypress) {
return;
}
if (key) {
console.log('got "keypress"',key.name);
} else {
if (ch)console.log('got "keypress character"',ch);
}
if (key && key.name == 'up') move(0,1,0,'up');
else if (key && key.name == 'down') move(0,-1,0,'down');
else if (key && key.name == 'left') move(-1,0,0,'left');
else if (key && key.name == 'right') move(1,0,0,'right');
else if (ch && ch == '-') move(0,0,-1,'zoom out');
else if (ch && ch == '+') move(0,0,1,'zoom in');
// On English keyboards '+' is "Shift and = key"
// Accept the "=" key as zoom in
else if (ch && ch == '=') move(0,0,1,'zoom in');
else if (ch && ch>='1' && ch <='9') goto_preset(ch);
});
}
function move(x_speed, y_speed, zoom_speed, msg) {
// Step 1 - Turn off the keyboard processing (so keypresses do not buffer up)
// Step 2 - Clear any existing 'stop' timeouts. We will re-schedule a new 'stop' command in this function
// Step 3 - Send the Pan/Tilt/Zoom 'move' command.
// Step 4 - In the callback from the PTZ 'move' command we schedule the ONVIF Stop command to be executed after a short delay and re-enable the keyboard
// Pause keyboard processing
ignore_keypress = true;
// Clear any pending 'stop' commands
if (stop_timer) clearTimeout(stop_timer);
// Move the camera
console.log('sending move command ' + msg);
cam_obj.continuousMove({x : x_speed,
y : y_speed,
zoom : zoom_speed } ,
// completion callback function
function (err, stream, xml) {
if (err) {
console.log(err);
} else {
console.log('move command sent '+ msg);
// schedule a Stop command to run in the future
stop_timer = setTimeout(stop,STOP_DELAY_MS);
}
// Resume keyboard processing
ignore_keypress = false;
});
}
function stop() {
// send a stop command, stopping Pan/Tilt and stopping zoom
console.log('sending stop command');
cam_obj.stop({panTilt: true, zoom: true},
function (err,stream, xml){
if (err) {
console.log(err);
} else {
console.log('stop command sent');
}
});
}
function goto_preset(number) {
if (number > preset_names.length) {
console.log ("No preset " + number);
return;
}
console.log('sending goto preset command '+preset_names[number-1]);
cam_obj.gotoPreset({ preset : preset_tokens[number-1] } ,
// completion callback function
function (err, stream, xml) {
if (err) {
console.log(err);
} else {
console.log('goto preset command sent ');
}
});
}
});