US 2014/0196102 A1 · METHOD FOR TRANSMITTING VIDEO SIGNALS FROM AN APPLICATION ON A SERVER OVER AN IP NETWORK TO A CLIENT DEVICE

Abstract

A method for transmitting a video signal from an application running on a server over an IP network to a client device. The application is drawing its content, in a plurality of sequential drawing events, into a virtual frame buffer. Simultaneously, each drawing event is registered in a list of drawing events and each drawing event is associated with an address (location) of each area that was affected by this drawing event. The list is repetitively checked and if any area have changed since previous periodic check, such area is retrieved, segmented into blocks of standardized size and transmitted, together with its address in a frame, over the IP network to the client. On the client side the encoded blocks are received and combined, using the address data, into frames of an encoded video stream that can be directly fed into an industry standard decoder of client device.

Claims30

Dependent claims

Method for transmitting a video signal over an IP network from a first application running on a server to a client device, said first application generating a video output that is intended to be shown as images on a display device, the method comprising:

said first application drawing its content into a virtual frame buffer on said server, in a plurality of consecutive drawing events, said content representing images to be shown, each such image comprising of a plurality of pixels, the virtual frame buffer thus at each moment of time comprising the freshest image;
entering each drawing event into a list of drawing events together with data defining the image area that was affected by the corresponding drawing event;
repetitively, at discrete time intervals
1. determining directly from the list of drawing events, which areas of the image have been changed by said drawing events since previous determination one discrete time interval earlier;
and
2. segmenting said changed areas of the image into one or more blocks of pixels, said blocks having predetermined size;
storing such predetermined size blocks together with their identification data in an output buffer;
and
periodically, at periodic time intervals, encoding said blocks stored in the output buffer together with their identification data and transmitting said encoded blocks over the IP network to the client device.

6 more elements

A method for transmitting a video signal from an IPTV server over an IP network to an IPTV settop box to be displayed on a display device connected to or integrated with said IPTV settop box, said method comprising:

a first application run on said IPTV server generating a plurality of consecutive drawing events, each of said consecutive drawing events changing at least one area of a frame stored in a virtual frame buffer on said IPTV server, so that the virtual frame buffer after each of said consecutive drawing events contains the full image to be shown on said display device;
entering each of said consecutive drawing events into a list of drawing events together with data defining the image area that was affected by said corresponding drawing event;
repetitively, at discrete time intervals, determining directly from the list of drawing events, which areas of the image have been changed by said drawing events since previous determination one discrete time interval earlier;
and
segmenting said changed areas of the image into one or more blocks of pixels, said blocks having predetermined size;
storing such predetermined size blocks together with their identification data in an output buffer;
and
periodically, at periodic time intervals, combining and encoding said blocks stored in the output buffer together with their identification data into a data stream of encoded blocks;
transmitting said data stream of encoded blocks from said IPTV server over the IP network to said IPTV settop box;
and
on said IPTV settop box, receiving said data stream of encoded, storing each of said encoded block into a third frame buffer according to corresponding identification data of said encoded block so that at each moment of time the third frame buffer contains the full image to be shown on said display device, and
periodically retrieving said encoded blocks from said third buffer and assembling said encoded blocks into an encoded full image frame of an encoded video stream, such encoded video stream suitable for being decoded by a industry standard video decoder included in said IPTV settop box.

9 more elements

Dependencies are inferred from the claim text.

Method for transmitting video signals from an application on a server over an ip network to a client device

Life of this patent

Method for transmitting video signals from an application on a server over an ip network to a client device

Life of this patent

Abstract

Claims30