Format of main stream

The stream consists of frames and messages. All dates are sent in 24 hour format:  dd.MM.yy kk:mm:ss

For instance, 15.05.10 10:51:44 – May 15, 2010 at 10:51:44

Three lines are received just after the http heading:

sessionid=29101F1\n

errmsg=Error text message\n

errcode=100\n

Here:

• sessionid -  session id. This parameter is reserved, not in use.
• errmsg – message about error in the text format;
• errcode possesses the following values:
• 100 – no errors
• 101 – too many users connected
• 102 – invalid password (in theory the password can be changed at any moment)
• 103 – video server is not available
• 104 – older version of the client. Update the version.

Video frame or message will be received (if errcode=100) after these three lines.

Frame format:

Frame\n

size=23978\n

delay=5243\n

width=320\n

height=240\n

file.name=C:\VIDEO\13-05-10 19\1._01\n

color=1\n

frm.total=500\n

frm.id=100\n

frm.time=15.05.10 10:51:44\n

format=1\n

byte[size-4] jpegdata

byte[4]  jpegdataformat

Here:

• Last 4 bytes are to consist of the name: either JPEG or JPG1. Other formats are not supported.
• size – the size of binary data with image.
• delay – delay (in milliseconds) between frames.
• width - width in pixels.
• height – height in pixels.
• file.name – name of the archive file. It is used to navigate through the archive.
• color - 0-black and white, 1-color
• frm.total – total frames in the archive file (this parameter is not essential for live video)
• frm.id – ordinal number in the archive file (this parameter is not essential for live video)
• frm.time – time when frame appears
• format - always 1;
• jpegdata – buffer with JPEG frame;
• jpegdataformat – 4 bytes with JPEG or JPG1.

Message format:

Msg=start\n

type=CAM\n

id=1\n

action=DISABLED\n

paramname=paramvalue\n

Msg=end\n

Here:

• Msg=start and Msg=end indicate the beginning and ending of the message.
• type – type of the object that is the source of the message
• id – object id
• action
• paramname=paramvalue – the set of parameters and their values. There can be several parameters with different names.