Method and apparatus for seaming of streaming content

• US 6,263,371 B1
• Filed: 06/10/1999
• Issued: 07/17/2001
• Est. Priority Date: 06/10/1999
• Status: Expired due to Term

• Current Assignee: CA, Inc. (d/b/a CA Technologies) (Broadcom, Inc.)
• Original Assignee: Cacheflow Inc.
• Inventors: Geagan, John B. III, Kellner, Michael D., Periyannan, Alagu S.
• Primary Examiner(s): Geckil, Mehmet B.
• Application Number:
  US09/329,963
• Time in Patent Office: 768 Days
• Field of Search: 709/231, 709/230, 709/234, 709/235, 709/236, 709/239, 709/242, 709/246, 370/540, 370/545, 370/538, 714/4
• US Class Current: 709/231
• CPC Class Codes: H04L 1/22 using redundant apparatus to increase reliability
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/613 for the control of the source by the destination control signals issued by the client directed to the server or network components specially adapted for selective content distribution H04N21/637
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 65/765 intermediate
• CPC Class Codes: H04L 67/01 Protocols
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04N 21/23424 involving splicing one content stream with another content stream, e.g. for inserting or substituting an advertisement
• CPC Class Codes: H04N 21/2381 Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network transmission of MPEG streams over ATM H04L12/5601
• CPC Class Codes: H04N 21/44016 involving splicing one content stream with another content stream, e.g. for substituting a video clip
• CPC Class Codes: H04N 21/6437 Real-time Transport Protocol [RTP]

Abstract

In the face of unacceptable data loss on connections between a content source and a content consumer, additional connections therebetween are opened. These additional connections are preferably opened between the content source and a proxy disposed between the content source and the content consumer. The proxy may then seam together data streams received from the content source across the additional connections before passing a resultant seamed stream to the content consumer. The seamed stream may be constructed by filling in information gaps in any of the data streams received from the content source with content derived from others of the data streams received from the content source. This derivation may be made on the basis of identifying characteristics (e.g., packet sequence numbers and/or time stamps) common throughout each of the data streams received from the content source.

Claims

1. A method, comprising seaming together two or more input data streams of common content, each made up of a number of packets, being received from a content source across one or more computer networks using an unreliable media transmission protocol at a proxy disposed between the content source and one or more content consumers so as to provide one or more output data streams to the or more content consumers, each of the output data streams including packets from multiple ones of the input data streams and including fewer missing packets than any individual one of the input data streams being received at the proxy from the content source.

2. The method of claim 1 wherein the transmission protocol comprises real-time transmission protocol (RTP).

3. The method of claim 1 wherein at least one of the content consumers comprises a plug-in for a Web browser.

4. The method of claim 1 wherein the seamed data streams are recorded as a seamed stream at the proxy.

5. The method of claim 1 wherein the proxy is physically co-located at one of the content consumers.

6. The method of claim 1 wherein the content source comprises a second proxy.

7. A method, comprising opening one or more additional connections between a content consumer and a content source in response to an indication that data loss between the content source and the content consumer over one or more existing connections therebetween has reached an unacceptable level.

8. The method of claim 7 wherein the unacceptable level is defined by a threshold.

9. The method of claim 7 wherein the one or more additional connections are opened between the content source and a proxy disposed between the content source and the content consumer.

10. The method of claim 9 wherein the proxy seams together data streams received from the content source across the additional connections before passing a resultant seamed stream to the content consumer.

11. The method of claim 10 wherein the proxy constructs the seamed stream by filling in information gaps in any of the data streams received from the content source with content derived from others of the data streams received from the content source.

12. The method of claim 11 wherein the content is derived from others of the data streams on the basis of identifying characteristics common throughout each of the data streams received from the content source.

13. The method of claim 12 wherein the identifying characteristics comprise packet sequence numbers.

14. The method of claim 12 wherein the identifying characteristics comprise time stamps.

15. The method of claim 12 wherein the identifying characteristics of each of the data streams received from the content source are normalized prior to any comparisons.

16. The method of claim 7 further comprising closing down one or more of the connections between the content consumers and the content source.

17. The method of claim 7 wherein one or more of the additional connections comprise alternative network routes to the content source.

18. The method of claim 17 wherein at least one of the alternative network routes includes a proxy.

19. A proxy configured to be coupled to one or more content consumers and a content source and further configured to open additional connections to the content source in response to an indication that data loss between the content source and one or more of the content consumers over one or more existing connections therebetween has reached an unacceptable level.

20. The proxy of claim 19 wherein the unacceptable level is defined by a threshold.

21. The proxy of claim 19 being further configured to seam together data streams received from the content source across the additional connections before passing a resultant seamed stream to the one or more content consumers.

22. The proxy of claim 21 being further configured to construct the seamed stream by filling in information gaps in any of the data streams received from the content source with content derived from others of the data streams received from the content source.

23. The proxy of claim 22 wherein the content is derived from others of the data streams on the basis of identifying characteristics common throughout each of the data streams received from the content source.

24. The proxy of claim 23 wherein the identifying characteristics comprise packet sequence numbers.

25. The proxy of claim 23 wherein the identifying characteristics comprise time stamps.

26. The proxy of claim 21 being further configured to close down one or more of the connections between the content consumers and the content source.

27. The proxy of claim 21 wherein one or more of the additional connections comprise alternative network routes to the content source.

28. The proxy of claim 27 wherein at least one of the alternative network routes includes another proxy.

29. The proxy of claim 23 further configured to record the seamed data streams.

30. The proxy of claim 23 wherein the identifying characteristics of each of the data streams received from the content source are normalized prior to any comparisons.