Remote re-multiplexing of transport streams

• US 8,514,853 B2
• Filed: 01/11/2010
• Issued: 08/20/2013
• Est. Priority Date: 01/11/2010
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Beheydt, Samie, Vanhaecke, Joachim M.
• Primary Examiner(s): Zhao, Wei
• Application Number:
  US12/685,128
• Publication Number:
  US 20110170539A1
• Time in Patent Office: 1,317 Days
• Field of Search: 370/389, 375/316
• US Class Current: 370/389
• CPC Class Codes: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
• CPC Class Codes: H04L 43/106 using time related information in packets, e.g. by adding timestamps
• CPC Class Codes: H04N 21/23608 Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/4344 Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers

Abstract

In one method embodiment, receiving at a first re-multiplexer and a second re-multiplexer a first indexed transport stream, the first re-multiplexer physically located at a location separate from the second re-multiplexer; receiving a helper transport stream, the helper transport stream comprising information about a set of operations associated with a previous re-multiplexing operation; re-multiplexing the first indexed transport stream at the first and second re-multiplexers based on the information; and generating by the first and second re-multiplexers a second transport stream and a third transport stream, respectively, the second transport stream identical to the third transport stream and different than the first indexed transport stream.

Claims

1. A method, comprising:

receiving at a first re-multiplexer and a second re-multiplexer a first indexed transport stream, the first re-multiplexer physically located in a first device remote from the second re-multiplexer physically located in a second device;

receiving a helper transport stream, the helper transport stream comprising information about a set of operations associated with a previous re-multiplexing operation;

re-multiplexing the first indexed transport stream at the first and second remote re-multiplexers based on the information; and

generating by the first and second re-multiplexers a second indexed transport stream and a third indexed transport stream, respectively, the second indexed transport stream identical to the third indexed transport stream and different than the first indexed transport stream;

wherein the re-multiplexing comprises program clock reference (PCR) re-stamping or inserting packets for inclusion in the second indexed transport stream and the third indexed transport stream, wherein the inserting packets comprises inserting null packets, program specific information (PSI) packets, system information (SI) packets, program and system information protocol (PSIP) packets, or a combination of two or more of the null packets, the PSI packets, the SI packets, or the PSIP packets.

2. The method of claim 1, wherein the re-multiplexing comprises selecting packets of the first indexed transport stream for inclusion in the second indexed transport stream and the third indexed transport stream.

3. The method of claim 1, wherein receiving the first indexed transport stream comprises receiving an indexed multi program transport stream.

4. The method of claim 1, wherein the re-multiplexing comprises separating the helper transport stream from the first indexed transport stream.

5. The method of claim 1, further comprising receiving at the first and second re-multiplexers one or more additional indexed transport streams, wherein re-multiplexing comprises separating the helper transport stream from the one or more additional indexed transport streams.

6. The method of claim 1, wherein receiving the helper transport stream comprises receiving the information in a fourth indexed transport stream separate from the first indexed transport stream.

7. The method of claim 6, wherein the fourth indexed transport stream excludes any indexed transport streams that are not helper transport streams.

8. The method of claim 1, wherein the re-multiplexing comprises applying the set of operations to the first indexed transport stream.

9. The method of claim 1, wherein the re-multiplexing and generating comprises clocking with a common clock source the first, second, and third indexed transport streams.

10. A method, comprising:

receiving at a master re-multiplexer an indexed transport stream;

re-multiplexing the indexed transport stream by performing a set of re-multiplexing operations;

generating a helper transport stream, the helper transport stream comprising a description of the set of re-multiplexing operations; and

providing the helper transport stream over a communications network to plural remote re-multiplexers contained in separate respective devices configured to identically remotely

re-multiplexing the indexed transport stream based on the helper transport stream;

wherein the set of re-multiplexing operations comprises one or more of program clock reference (PCR) re-stamping or inserting packets, wherein the inserting packets comprises inserting null packets, program specific information (PSI) packets, system information (SI) packets, program and system information protocol (PSIP) packets, or a combination of two or more of the null packets, the PSI packets, the SI packets, or the PSIP packets.

11. The method of claim 10, further comprising providing the indexed transport stream over the communications network to the plural remote re-multiplexers contemporaneously with provision of the helper transport stream.

12. The method of claim 10, further comprising receiving one or more additional indexed transport streams, and further comprising generating an additional helper transport stream for each new re-multiplexed transport stream.

13. The method of claim 10, wherein an index value for each packet of the indexed transport stream comprises a unique address for a defined time window or packet count for the each packet separate from a packet identifier (PID) value.

14. The method of claim 10, wherein the re-multiplexing and generating is based on a clock reference common to the master re-multiplexer and the plural remote re-multiplexers.

15. The method of claim 10, wherein the providing comprises providing the helper transport stream in a multiplex with the indexed transport stream.