Remote display protocol, video display system, and terminal equipment

• US 20050021810A1
• Filed: 08/29/2003
• Published: 01/27/2005
• Est. Priority Date: 07/23/2003
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Hanaoka, Seishi, Umemura, Masaya, Hara, Tsutomu, Hiroi, Kazushige, Shigematsu, Kazuo
• Application Number:
  US10/651,257
• Publication Number:
  US 20050021810A1
• Time in Patent Office: Days
• US Class Current: 709/231
• 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 5/363 Graphics controllers
• CPC Class Codes: G09G 5/39 Control of the bit-mapped memory
• CPC Class Codes: H04N 21/234309 by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 or from Quicktime to Realvideo conversion of standards in analog television systems H04N7/01
• CPC Class Codes: H04N 21/234363 by altering the spatial resolution, e.g. for clients with a lower screen resolution
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/41265 having a remote control device for bidirectional communication between the remote control device and client device unidirectional remote control device H04N21/42204
• CPC Class Codes: H04N 21/42653 for processing graphics
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/440218 by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 conversion of standards in analogue television systems H04N7/01
• CPC Class Codes: H04N 21/440263 by altering the spatial resolution, e.g. for displaying on a connected PDA

Abstract

In order to prevent a reduction in frame rate of a reproduced moving picture on the terminal equipment side for performing a display and enable moving picture playback under a simple construction in a remote display technology, either a server or a terminal equipment or both thereof are equipped with router-attached graphics engines. The server draws a window and decoration thereof into a virtual VRAM, calculates the difference in the drawn data, performs a first decode process as a pre-process, adds drawing position information to intermediate data obtained in the first decode process, and transmits moving picture stream data to the terminal equipment. The terminal equipment effects a second decode process used as a post-process on received data, and draws and displays the so-process data in accordance with the drawing position information.

Claims

1. A remote display protocol for displaying moving picture stream data stored in a server or generated by the server on the side of a terminal equipment,

wherein said server draws a window and decoration thereof into a virtual VRAM, calculates a difference in the drawn data, performs a first decode process as a pre-process, adds drawing position information to intermediate data obtained in the first decode process, and transmits the result of said addition to the terminal equipment side, and

wherein said terminal equipment performs a second decode process as a post-process after reception of the moving picture stream data, and draws and displays the data inside the window in accordance with the drawing position information.

2. The remote display protocol according to claim 1, wherein said server tag-adds information necessary for the second decode process to the intermediate data and transfers the so-obtained data to the terminal equipment side in sequence.

3. The remote display protocol according to claim 2, wherein the tag-added information is a parameter for the stream data obtained in the first decode process.

4. The remote display protocol according to claim 2, wherein the tag-added information is information for identifying a procedure for a process completed in the first decode process, or information for identifying a procedure for a process started in the second decode process.

5. The remote display protocol according to claim 1, wherein said server and said terminal equipment are respectively capable of swapping information about resources of graphics engines included therein with each other.

6. The remote display protocol according to claim 5, wherein either one or both of said server and said terminal equipment perform either one or both of the first decode process and the second decode process, based on the swapped information about the resources of the graphics engines.

7. The remote display protocol according to claim 6, wherein said server transmits the intermediate data obtained in the first decode process to the terminal equipment side.

8. The remote display protocol according to claim 1, wherein when a session is established, said server instructs the terminal equipment side to ensure a condition for each display resource.

9. The remote display protocol according to claim 1, wherein upon session establishment, said terminal equipment discloses a condition for each display resource and information of input means to said server.

10. A video display system for transmitting and receiving a video between first and second terminal equipments and displaying the same, comprising:

said first terminal equipment that notifies information about a resource of its own first graphics engine to said second terminal equipment; and

said second terminal equipment that draws a comparison between the notified information about the resource of the first graphics engine and information about a resource of its own second graphics engine, based on the notified information, acts for above process in accordance with the resource of the second graphics engine in place of the resource of the first graphics engine without using part of the resource of the first graphics engine, and transmits processed data at an intermediate stage,

wherein said first terminal equipment having deactivated the part of the resource of the first graphic engine processes the data at the intermediate stage in accordance with non-deactivated resource to playback the video.

11. The video display system according to claim 10, wherein the information about the resources of the first and second graphics engines are information of memories placed under the control of the graphics engines.

12. The video display system according to claim 10, wherein the information about the resources of the first and second graphics engines are information about operating frequencies of the resources of the graphics engines, information about computing power set every functions of computing units of the graphics engines, or information about manufacturers of the graphics engines and the types of the graphics engines.

13. A video display system for transmitting and receiving videos among a plurality of terminal equipments and displaying the same,

wherein said terminal equipments respectively have host CPU, graphics engines, a plurality of bearer chips, storages and input/output units, said graphics engines being equipped with routers thereinside and being connected to the plurality of bearer chips and the host CPU, respectively.

14. The video display system according to claim 13, wherein the plurality of terminal equipments include a first terminal equipment that transmits a video prepared by its own host CPU via the router of its own first graphics engine and a bearer connected to the first graphics engine, and a second terminal equipment which has a bearer connected to its own second graphics engine, said bearer receiving a video sent from the second terminal equipment, and directly writes the received video into the first graphics engine via the router of the first graphics engine.

15. The video display system according to claim 14, wherein the video prepared by the host CPU of the first terminal equipment is a video encoded by the host CPU.

16. The video display system according to claim 14, wherein said first graphics engine transmits a read command to the bearer connected to the first graphics engine via the router of the first graphics engine, and the bearer reads the transmitting video from the first graphics engine or a VRAM included in the first graphics engine in accordance with the read command.

17. The video display system according to claim 14, wherein when the bearer connected to the second graphics engine has received a video, the router of the second graphics engine analyzes a leading portion of the video and writes the result of analysis into a CPU or a main memory of the second terminal equipment, or the second graphics engine or a VRAM included in the second graphics engine, which is set as a transfer destination.

18. A terminal equipment for transmitting and receiving moving picture stream data, comprising:

a CPU,

wherein said CPU encodes a photographed video, a received video or a read video, adds a command of a graphics engine of a display unit or an op code thereof indicative of a resource necessary for decoding to the encoded video, transmits the same, and decodes received data in accordance with the command or the op code at the graphics engine of the display unit.