System and method for just in time streaming of digital programs for network recording and relaying over internet protocol network

• US 20080313687A1
• Filed: 06/18/2007
• Published: 12/18/2008
• Est. Priority Date: 06/18/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Rajakarunanayake, Yasantha Nirmal
• Granted Patent: US 7,908,624 B2
• Time in Patent Office: Days
• US Class Current: 725/110
• CPC Class Codes: H04N 21/2343 involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements video transcoding H04N19/40; media packet handling at the source H04L65/762
• CPC Class Codes: H04N 21/23608 Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/2393 involving handling client requests scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/2407 Monitoring of transmitted content, e.g. distribution time, number of downloads arrangements for monitoring programmes for broadcast or for distribution combined with broadcast H04H20/14
• CPC Class Codes: H04N 21/2408 Monitoring of the upstream path of the transmission network, e.g. client requests monitoring data switching networks utilization H04L43/0876; scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/4223 Cameras H04N23/00 takes precedence
• CPC Class Codes: H04N 21/437 Interfacing the upstream path of the transmission network, e.g. for transmitting client requests to a VOD server flow control in data networks H04L47/10; streaming protocols, e.g. RTP or RTCP, H04L65/65; scheduling or organising the servicing of application requests in data packet switching networks H04L67/60
• CPC Class Codes: H04N 21/4788 communicating with other users, e.g. chatting arrangements for providing for computer conferences, e.g. chat rooms, to substation in data switching networks H04L12/1813; distributed application using peer-to-peer [P2P] networks H04L67/104

Abstract

A settop box for streaming a television program to a network device through a network includes a central processing unit, a network interface device, a direct memory access engine, a buffer, and a memory for storing computer-executable instructions. The stored instructions cause the direct memory access engine to route time-ordered digital media data packets encoding the television program into the buffer, cause the central processing unit to add a network header to the digital media data packets, and cause the network interface device to relay the digital media data packets to a network device through the network, wherein the packets are relayed substantially without latency and with a time-ordering based on the same time-ordering of the packets in the buffer.

Claims

1. A method comprising:

receiving a television broadcast at a first settop box, wherein the television broadcast comprises at least one program;

receiving time-ordered digital media data packets encoding the at least one program into a buffer;

adding a network header to the digital media data packets;

relaying the digital media data packets to a network device connected to the first settop box through a network, wherein the packets are relayed substantially without latency and with a time-ordering based on the same time-ordering of the packets in the buffer;

receiving acknowledgment packets from the network device acknowledging the reception of the relayed digital media data packets; and

freeing space in the buffer that was used to buffer for the acknowledged data packets.

2. The method of claim 1, wherein the digital media data packets are non-network-aware data packets.

3. The method of claim 1, further comprising relaying the digital media data packets to a plurality of network devices connected to the first settop box through the network.

4. The method of claim 1, wherein the network comprises a wireless network.

5. The method of claim 1, further comprising:

establishing a connection between the first settop box and the network device for a session according to a network protocol;

defining a packet header template having a plurality of static fields filled with static values valid for all packets sent from the first settop box to the network device during a relaying session and variable fields that can acquire packet-dependent values for different packets sent during the session;

creating a packet header based on the header template by defining, in a central processing unit, at least one value of a variable field and by reusing the static values for the static fields; and

wherein adding the network header to the digital media data packets includes pre-pending the packet header created based on the header template to payload data from the buffer to form the packets to be relayed to the network device.

6. The method of claim 5, wherein the protocol comprises TCP/IP and wherein a variable field of the header includes a value of a sequence number identifying the packet within a sequence of a plurality of packets sent during the session.

7. The method of claim 5, wherein the protocol comprises TCP/IP and wherein a variable field of the header includes a value of an acknowledgement number for the packet, the acknowledgement number corresponding to a value of a sequence number of an acknowledgement packet that the first computing device expects to receive from the second computing device in response to the sending of the packet to the second computing device.

8. The method of claim 5, wherein the protocol comprises TCP/IP and wherein the static fields include a source field, a destination field, and a window size field, wherein the variable fields include a checksum field, and the method further comprising performing a checksum analysis on the packet and adding the result of the checksum analysis to the checksum field.

9. The method of claim 5, wherein the protocol comprises TCP/IP and further comprising exporting from a cache the at least one value of a variable field defined by the central processing unit to a memory to associate the at least one value with the static values for the packet header.

10. The method of claim 5, wherein the variable fields include a sequence number field and an acknowledgement number field, and further comprising assigning sequence number values with a central processing unit to the sequence number fields of the header template for each of the plurality of packets.

11. The method of claim 5, wherein the first settop box and the network device are located within the same building.

12. The method of claim 1, further comprising:

establishing connections between the first settop box and a plurality of network device for sessions according to a network protocol; and

relaying the digital media data packets via multicast streaming to the plurality of network devices according to the network protocol.

13. The method of claim 12, wherein the network protocol is UDP.

14. A settop box for streaming a television program to a network device through a network, the settop box comprising:

a central processing unit;

a network interface device;

a direct memory access engine;

a buffer; and

a memory for storing computer-executable instructions for;

causing the direct memory access engine to route time-ordered digital media data packets encoding the television program into the buffer;

causing the central processing unit to add a network header to the digital media data packets;

causing the network interface device to relay the digital media data packets to a network device through the network, wherein the packets are relayed substantially without latency and with a time-ordering based on the same time-ordering of the packets in the buffer.

15. The settop box of claim 14, wherein the digital media data packets are non-network-aware data packets.

16. The settop box of claim 14, wherein the network comprises a wireless network.

17. The settop box of claim 14, wherein the memory further comprises computer executable instructions for:

causing the central processing unit to define a network header template and store the network header template in memory, the network header template has having static fields filled with static values valid for all packets sent during the session and variable fields that can acquire packet-dependent values for different packets of the plurality of data packets sent during a session, wherein the variable fields include a sequence number field and an acknowledgement number;

causing the central processing unit to assign sequence number values to the sequence number fields of the header template for each of the plurality of packets;

causing the central processing unit to pre-pend network headers based on the network header template to payload data in the buffer to form packets to be relayed to the network device.

18. The settop box of claim 14, wherein the settop box is a diskless settop box.

19. The settop box of claim 14, further comprising a RAVE.

20. The settop box of claim 14, wherein the settop box is located within the same building as the network device.