Method and apparatus for redirection of video data

• US 8,933,941 B2
• Filed: 08/23/2005
• Issued: 01/13/2015
• Est. Priority Date: 08/23/2004
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Emerson, Theodore F., Noonan, Robert L., Heinrich, David F., Dykes, Don
• Primary Examiner(s): CHOW, JEFFREY J
• Application Number:
  US11/209,886
• Publication Number:
  US 20060039465A1
• Time in Patent Office: 3,430 Days
• Field of Search: 345/520, 345/132, 345/533, 345/543, 345/544, 345/501, 375/241.01, 375/240.26, 380/200, 709/217, 709/219, 710/15, 710/126, 711/145, 711/146, 725/39, 725/41, 358/105
• US Class Current: 345/502
• CPC Class Codes: G06F 11/2294 by remote test
• CPC Class Codes: G06F 3/1454 involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
• CPC Class Codes: G06F 3/1462 with means for detecting differences between the image stored in the host and the images displayed on the remote displays
• CPC Class Codes: G09G 2340/02 Handling of images in compressed format, e.g. JPEG, MPEG
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 2001/0094 Bus
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/137 Motion inside a coding unit, e.g. average field, frame or block difference
• CPC Class Codes: H04N 19/164 Feedback from the receiver or from the transmission channel
• CPC Class Codes: H04N 19/174 the region being a slice, e.g. a line of blocks or a group of blocks
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/42 characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation H04N19/635 takes precedence
• CPC Class Codes: H04N 19/436 using parallelised computational arrangements
• CPC Class Codes: H04N 19/507 using conditional replenishment
• CPC Class Codes: H04N 21/4334 Recording operations recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27
• CPC Class Codes: H04N 21/6332 directed to client

Abstract

A remote management controller may include a video redirection device and a processor. The video redirection device may be configured to: obtain a slice of video data output from a video graphics controller; calculate at least one value correlative to the slice of video data; and if the calculated value for any portion of the slice differs from a value for a previously obtained corresponding portion, update a table associated with an image related to a remote system with the calculated value, and process the portion of the slice to create a data portion of a network packet in a network buffer. The processor may be configured to: allocate the network buffer; and provide a header portion of the network packet to the network buffer.

Claims

1. A remote management controller comprising:

a processor configured to execute instructions; and

a video redirection device, separate from the processor, configured to;

obtain a slice of video data output from a video graphics controller, the video graphics controller to receive graphical data from a frame buffer and supply the graphical data to a display,

calculate at least one value correlative to the slice of video data,

if the calculated value for any portion of the slice differs from a value for a previously obtained corresponding portion, update a table associated with an image related to a remote system with the calculated value, and process the portion of the slice to create a data portion of a network packet in a first network buffer of multiple network buffers, wherein the processor is configured by the instructions to;

allocate the multiple network buffers at a rate correlative to the rate at which slices of video data are obtained from the video graphics controller, and

provide a header portion of the network packet to the first network buffer.

2. The remote management controller, as set forth in claim 1, wherein the processor does not read the data portion of the network packet.

3. The remote management controller, as set forth in claim 1, wherein the video redirection device comprises an encoder engine to process the portion of the slice into the data portion of the network packet.

4. The remote management controller, as set forth in claim 1, wherein the at least one value comprises a cyclic redundancy check.

5. The remote management controller, as set forth in claim 1, wherein the video data is obtained from a direct video output of the video graphics controller.

6. The remote management controller, as set forth in claim 3, wherein the encoder engine is configured to process the video data by compressing the video data.

7. The remote management controller, as set forth in claim 3, wherein the encoder engine is configured to process the video data by encoding the video data.

8. The remote management controller, as set forth in claim 3, wherein the encoder engine is configured to process the video data by encrypting the video data.

9. The remote management controller, as set forth in claim 3, wherein the processor notifies the encoder engine when the network buffer has been allocated.

10. The remote management controller, as set forth in claim 1, wherein the video redirection device processes any remaining portion of the network packet.

11. A method of processing video data for transmission to a remote system, the method comprising:

obtaining a slice of video data output from a video graphics controller, the video graphics controller to receive graphical data from a frame buffer and supply the graphical data to a display;

calculating at least one value correlative to the slice of video data;

allocating multiple network buffers at a rate correlative to the rate at which slices of video data are obtained from the video graphics controller;

if the calculated value for any portion of the slice differs from a value for a previously obtained corresponding portion, updating a table associated with an image related to a remote system with the calculated value, and processing the portion of the slice to create a data portion of a network packet in a first network buffer; and

providing a header portion of the network packet to the first network buffer.

12. The method, as set forth in claim 11, comprising controlling the rate at which slice of video data are obtained by controlling the number of network buffers allocated.

13. The method, as set forth in claim 11, wherein calculating the value correlative to the slice comprises calculating a cyclic redundancy check.

14. The method, as set forth in claim 11, comprising using a processor only for allocating the network buffer, providing the header portion, and facilitating transmission of the network packet to the remote system.

15. The method, as set forth in claim 11, wherein obtaining the slice of video data comprises obtaining the slice of video data from a direct video output of the video graphics controller.

16. The method, as set forth in claim 11, wherein processing the video data into the data portion comprises compressing the video data.

17. The method, as set forth in claim 11, wherein processing the video data into the data portion comprises encoding the video data.

18. The method, as set forth in claim 11, wherein processing the video data into the data portion comprises encrypting the video data.

19. The method, as set forth in claim 11, wherein the network packet is suitable for transmission to the remote system.

20. A computer comprising:

at least one central processing unit;

main memory accessible by the at least one central processing unit;

a video graphics controller configured to receive video data from the at least one central processing unit and to generate a video data output, the video graphics controller to receive graphical data from a frame buffer and supply the graphical data to a display;

a remote management controller coupled to receive the video data output from the video graphics controller, the remote management controller comprising a video redirection device and a processor separate from the video redirection device,

the video redirection device being configured to;

obtain a slice of video data output from the video graphics controller,

calculate at least one value correlative to the slice of video data,

if the calculated value for any portion of the slice differs from a value for a previously obtained corresponding portion, update a table associated with an image related to a remote system with the calculated value, and process the portion of the slice to create a data portion of a network packet in a first network buffer of multiple network buffers; and

the processor being configured to;

allocate the multiple network buffers at a rate correlative to the rate at which slices of video data are obtained from the video graphics controller; and

provide a header portion of the network packet to the first network buffer.

21. The computer, as set forth in claim 20, wherein the processor does not read the data portion of the network packet.

22. The computer, as set forth in claim 20, wherein the video redirection device comprises an encoder engine to process the portion of the slice into the data portion of the network packet.

23. The computer, as set forth in claim 20, wherein the at least one value comprises a cyclic redundancy check.

24. The computer, as set forth in claim 20, wherein the slice of video data is obtained from a direct video output of the video graphics controller.

25. The computer, as set forth in claim 22, wherein the encoder engine is configured to process the block of video data by compressing the video data.

26. The computer, as set forth in claim 22, wherein the encoder engine is configured to process the video data by encoding the video data.

27. The computer, as set forth in claim 22, wherein the encoder engine is configured to process the video data by encrypting the video data.

28. The computer, as set forth in claim 20, wherein the network packet is suitable for transmission to the remote system.

29. The computer, as set forth in claim 20, wherein the video redirection device processes any remaining portion of the network packet.