ohmm
Class CvBase.ImageServer

java.lang.Object
  ohmm.CvBase.ImageServer

Enclosing class:

CvBase

protected class CvBase.ImageServer
extends java.lang.Object

HTTP multipart/x-mixed-replace image server.

The image encoding is controlled by CvBase.serverFormat and CvBase.serverMimeType, reasonable options include jpeg and gif. The former constitutes MJPEG encoding, and gives good quality with low bandwidth, but may not be compatible with all browsers. In particular, current versions of Firefox show severe flickering with MJPEG encoding (Mozilla bug 625012). Chrome seems to work pretty well, though there are issues with non-alphanumeric keycodes. gif encoding doesn't look great due to color quantizing.

Images are served to at most one client at a time at maximum framerate CvBase.maxServerFPS.

Normally these variables are configured prior to starting the server, but it should be possible to change them online, protected by CvBase.serverLock.

The server starts automatically and listens on CvBase.serverPort iff CvBase.useServer is true.

The server knows about the following request paths:

• /server.html - the server page including the image and javascript to send keyboard and mouse events back
• /image - the live image
• /key - special path to recieve HTML GET requests encoding key events on the client
• /mouse - special path to recieve HTML GET requests encoding mouse events on the client
• /echo - echo the client request for debugging

Thus, once the server is running, you can connect to it from a remote host by bringing up e.g. Google Chrome and browsing to the url

 http://ADDR:PORT/server.html

 

where ADDR is the IP address and PORT the listening port of the server.

Field Summary

protected java.util.concurrent.ExecutorService	executor The transaction executor.
protected com.sun.net.httpserver.HttpServer	server The internal server object.

Constructor Summary

protected

CvBase.ImageServer(int port) Binds server to indicated port.

Method Summary

protected void

stop(int delay) Stops server and executor.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

server

protected com.sun.net.httpserver.HttpServer server

The internal server object.

executor

protected java.util.concurrent.ExecutorService executor

The transaction executor.

Constructor Detail

CvBase.ImageServer

protected CvBase.ImageServer(int port)

Binds server to indicated port.

Method Detail

stop

protected void stop(int delay)

Stops server and executor.