Binding for audio/video streaming in a topology of devices

• US 8,984,155 B2
• Filed: 05/18/2010
• Issued: 03/17/2015
• Est. Priority Date: 01/28/2010
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Kambhatla, Srikanth
• Primary Examiner(s): Zand, Kambiz
• Assistant Examiner(s): Ullah, Sharif E
• Application Number:
  US12/782,040
• Publication Number:
  US 20110182560A1
• Time in Patent Office: 1,764 Days
• Field of Search: 709/231, 713/182, 713/150, 380/277, 380/286, 726/2, 726/21, 726/30
• US Class Current: 709/231
• CPC Class Codes: G06F 13/4027 using bus bridges G06F13/4022 takes precedence
• CPC Class Codes: G06F 13/4221 being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus
• CPC Class Codes: G06F 3/1423 controlling a plurality of local displays, e.g. CRT and flat panel display
• CPC Class Codes: G09G 2350/00 Solving problems of bandwidth in display systems
• CPC Class Codes: G09G 2352/00 Parallel handling of streams of display data
• CPC Class Codes: G09G 2370/04 Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
• CPC Class Codes: G09G 2370/10 Use of a protocol of communication by packets in interfaces along the display data pipeline
• CPC Class Codes: G09G 2370/20 Details of the management of multiple sources of image data
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: H04L 43/0882 Utilisation of link capacity
• CPC Class Codes: H04L 65/1089 by adding media; by removing media
• CPC Class Codes: H04L 65/1094 Inter-user-equipment sessions transfer or sharing
• CPC Class Codes: H04L 65/61 for supporting one-way streaming services, e.g. Internet radio

Abstract

Resources may be managed in a topology for audio/video streaming. DisplayPort is a digital audio/video interconnect standard of the Video Electronic Standards Association (VESA). It allows video and audio to be coupled from a computer to a video display or an audio playback system. The topology includes audio/video sources and sinks and intervening branch devices. Messages between these sources, sinks, and branch devices may be used for resource management.

Claims

1. A method comprising:

receiving, in a device between a source and sink of video or audio data, a request to add an additional stream for audio or video data from the source to the sink;

storing, in the device, an input stream identifier and input port associated with the stream;

mapping, in the device, the input stream identifier to an output stream identifier for the stream;

storing, in the device the output stream identifier and output port number for the stream so that the device can handle the stream;

forwarding from the device, the request to add the stream to another device between the source and the sink and enabling said another device to handle an additional stream in response to the request sent from source to sink and then forwarded on by the receiving device between the source and the sink to said another device between the receiving device and the sink, said the another device that receives the request is then adapted to handle the additional stream when it arrives; and

receiving in said device, a specification of a bandwidth and number of streams that a downstream device can handle, and responding by sending an upstream message with a bandwidth and number of streams that both the device and the downstream device can handle.

2. The method of claim 1 including storing the stream identifier input port, input stream identifier, and output stream identifier in a mapping table.

3. The method of claim 1 including sending control signals on a first channel and data signals on a second channel.

4. The method of claim 1 including establishing the device in a topology of point-to-point connections.

5. The method of claim 4 including an address generation phase in which addresses are agreed to for each of the devices in the topology.

6. The method of claim 4 including undergoing an enumeration sequence before adding the stream.

7. The method of claim 1 including, if the device has a resource constraint that prevents adding the stream, providing a negative acknowledgement in response to receipt of said request to add a stream.

8. The method of claim 1 including only forwarding the request when the device is not the destination for the request.

9. The method of claim 1 including only propagating one request to add a stream through said device at a time.

10. The method of claim 9 including blocking a second stream requested for the same time as a first stream and unblocking the second stream after the first stream has completed.

11. A non-transitory computer readable medium storing instructions executed by a processor in a device between a source and sink of video or audio data to:

establish the device in a topology including said source and sink;

receive a request from the source to add an additional stream for audio or video data from the source to the sink;

store an input stream identifier and input port associated with the stream;

map, in the device, the input stream identifier to an output stream identifier for the stream;

store, in the device the output stream identifier and output port number for the stream so that the device can handle the stream;

forward from the device, the request to add the stream to another device between the source and the sink and enable said another device to handle an additional stream in response to the request sent from source to sink and then forwarded on by the receiving device between the source and the sink to said another device between the receiving device and the sink, said the another device that receives the request is then adapted to handle the additional stream when it arrives and;

receive in said device, a specification of a bandwidth and number of streams that a downstream device can handle, and respond by sending an upstream message with a bandwidth and number of streams that both the device and the downstream device can handle.

12. The medium of claim 11 further storing instructions to store the identifiers and port in a mapping table.

13. The medium of claim 11 further storing instructions to send control signals on a first channel and data signals on a second channel.

14. The medium of claim 11 further storing instructions to obtain addresses for devices in said topology during an address generation phase.

15. The medium of claim 11 further storing instructions to undergo an enumeration sequence before adding the stream.

16. The medium of claim 11 further storing instructions to provide a negative acknowledgement in response to receipt of said request to add a stream if the device has a resource constraint that prevents adding the stream.

17. The medium of claim 11 further storing instructions to only forward the request when the device is not the destination for the request.

18. The medium of claim 11 further storing instructions to only propagate one request to add a stream through the device at a time.

19. The medium of claim 18 further storing instructions to block a second stream requested for the same time as the first stream.

20. The medium of claim 19 further storing instructions to unblock the second stream after the first stream has completed.

21. An apparatus comprising:

a receiver;

a transmitter; and

a unit coupled to said receiver and transmitter to establish the apparatus in a topology including a source and sink of video or audio data, to receive a request from the source to add an additional stream for audio or video data from the source to the sink, to store an input stream identifier and input port associated with the stream, to map, in the unit the input stream identifier to an output stream identifier for the stream, to store, in the unit the output stream identifier and output port number for the stream so that the unit can handle the stream and forward from the unit, the request to add the stream to a device between the source and the sink and enable said device to handle an additional stream in response to the request sent from source to sink and then forwarded on by the device between the source and the sink, said device that receives the request is then adapted to handle the additional stream when it arrives, receive in said device, a specification of a bandwidth and number of streams that a downstream device can handle, and respond by sending an upstream message with a bandwidth and number of streams that both the device and the downstream device can handle.

22. The apparatus of claim 21 wherein said apparatus is a branch device.

23. The apparatus of claim 21 to only propagate one request to add a stream through the apparatus at a time.

24. The apparatus of claim 23, said unit to block a second stream request for the same time as a first stream.

25. The apparatus of claim 24, said unit to unblock the second stream after the first stream has completed.