Multimedia client for multimedia/hybrid network

• US 5,953,350 A
• Filed: 03/13/1995
• Issued: 09/14/1999
• Est. Priority Date: 03/13/1995
• Status: Expired due to Term

• Current Assignee: Cisco Systems, Inc.
• Original Assignee: Selsius Systems Incorporated (Cisco Systems, Inc.)
• Inventors: Higgins, Ronald D.
• Primary Examiner(s): TON, DANG T
• Application Number:
  US08/404,191
• Time in Patent Office: 1,646 Days
• Field of Search: 370/60, 370/60.1, 370/61, 370/94.1, 370/94.2, 370/94.3, 370/110.1, 370/85.13, 370/82, 370/95.1, 370/84, 370/68.1, 379/95, 379/96, 379/158, 340/825.02, 348/15, 348/16, 348/388
• US Class Current: 370/524
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A system and method for allowing remote control of an isochronous device. The system comprises: (1) first and second isochronous devices, (2) a packet-based signalling channel coupling the first and second isochronous devices and allowing communication of signalling messages between the first and second isochronous devices, the first isochronous device capable of initiating a request to the second isochronous device to transfer multimedia information from the second isochronous device to the first isochronous device and (3) an isochronous user information path established by the second isochronous device in response to initiation of the request, the isochronous user information path coupling the first and second isochronous devices for transfer of the multimedia information, the first isochronous device thereby effecting remote control of the second isochronous device. The present invention further introduces a system for adapting a data stream received into a computer from an isochronous user information path for use by a video file viewing application, such as an MPEG video viewer.

Claims

1. In a computer having an operating system, a video file viewing application executing within said operating system and circuitry coupling said computer to an isochronous user information path, a system for adapting a data stream received into said circuitry from said isochronous user information path for use by said video file viewing application, comprising:

a buffer, under control of a buffer input manager, said buffer capable of receiving and storing portions of said data stream from said isochronous information path via said buffer input manager; and

a file emulator capable of extracting said portions of said data stream from said buffer and presenting said portions as though having been retrieved from a file compatible with said operating system, said file emulator thereby enabling said video file viewing application to retrieve said portions from said file emulator and display said portions on an output device associated with said computer.

2. The system as recited in claim 1 wherein said data stream is a real time audio data stream.

3. The system as recited in claim 1 wherein said isochronous user information path is carried on an Integrated Services Digital Network (ISDN) B channel.

4. The system as recited in claim 1 wherein said circuitry coupling said computer system to said isochronous user information path comprises an isochronous Integrated Services Digital Network (ISDN) B channel driver.

5. The system as recited in claim 1 further comprising an Integrated Services Digital Network (ISDN) B channel driver interface coupling said circuitry and said buffer input manager.

6. The system as recited in claim 1 wherein said buffer is a ring buffer.

7. The system as recited in claim 1 wherein said file emulator comprises a virtual device driver.

8. The system as recited in claim 1 further comprising a logical device enabling said video file viewing application to retrieve said portions from said file emulator.

9. The system as recited in claim 1 wherein said operating system comprises Microsoft®

Window®

overlaying Miscrsoft®

MS-DOS.

10. The system as recited in claim 1 wherein said computer is a personal computer (PC).

21. The system as recited in claim 1 wherein said data stream is a real time video data stream.

22. The system as recited in claim 1 wherein said operating system comprises Microsoft®

Windows®

.

11. In a computer having an operating system, a video file viewing application executing within said operating system and circuitry coupling said computer to an isochronous user information path, a method for adapting a data stream received into said circuitry from said isochronous user information path for use by said video file viewing application, comprising the steps of:

receiving and storing portions of said data stream from said isochronous information path in a buffer under control of a buffer input manager;

extracting said portions of said data stream from said buffer with a file emulator; and

presenting, with said file emulator, said portions as though having been retrieved from a file compatible with said operating system, said file emulator thereby enabling said video file viewing application to retrieve said portions from said file emulator and display said portions on an output device associated with said computer.

12. The method as recited in claim 11 wherein said data stream is a real time audio data stream.

13. The method as recited in claim 11 further comprising the step of carrying said isochronous user information path on an Integrated Services Digital Network (ISDN) B channel.

14. The method as recited in claim 11 wherein said circuitry coupling said computer system to said isochronous user information path comprises an isochronous Integrated Services Digital Network (ISDN) B channel driver.

15. The method as recited in claim 11 further comprising the step of coupling an Integrated Services Digital Network (ISDN) B channel driver interface between said circuitry and said buffer input manager.

16. The method as recited in claim 11 further comprising the step of storing said portions in a ring buffer.

17. The method as recited in claim 11 wherein said file emulator comprises a virtual device driver.

18. The method as recited in claim 11 further comprising the step of enabling said video file viewing application to retrieve said portions from said file emulator with a logical device.

19. The method as recited in claim 11 wherein said operating system comprises Microsoft®

Windows®

overlaying Microsoft®

MS-DOS.

20. The method as recited in claim 11 wherein said computer is a personal computer (PC).

23. The method as recited in claim 11 wherein said data stream is a real time video data stream.

24. The method as recited in claim 11 wherein said operating system comprises Microsoft®

Windows®

.