Oldest known version of this page was edited on 2007-11-02 11:21:34 by AlexMay []
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FreeFrame Video Streaming Packet Format v1.5 (c)2006-2007 Alex May
The bigfug streaming plugins use TCP or UDP to transmit each video frame. Each packet can contains several lines of video.
Packet Format
Frame Number (1 byte)
This is a counter that is incremented for every frame sent (not every packet). When it gets to 0xff it wraps around to 0x00
Bit Depth (1 byte)
One of the following codes:
16 bit (2 bytes per pixel) = 0
24 bit (3 bytes per pixel) = 1
32 bit (4 bytes per pixel) = 2
Vertical Line Number (2 bytes)
The vertical position of the first enclosed line of image data ranging from 0 to ( Frame Height - 1 )
Frame Width (2 bytes)
The width (in pixels) of the frame
Frame Height (2 bytes)
The height (in pixels) of the frame
Image Data
(2, 3, or 4 bytes per pixel (depending on bit depth) * Frame Width * LinesInPacket. With no padding between pixels or lines)
To find how many lines are in the packet, use the following:
LinesInPacket = ( ReceivedPacketSize - HeaderSize (8 bytes) ) / ( FrameWidth * BytesPerPixel )
Example packet header showing byte order:
Frame Number = 0x12 = 18
Bit Depth = 0x01 = 1 = 24 bit data
Line Number = 0x0002 = 2
Frame Width = 0x0160 = 352
Frame Height = 0x0120 = 288
CategoryFreeFrame -
FreeFrameVideoStreaming
