Interactive Codec Selection

• US 20070140116A1
• Filed: 12/16/2005
• Published: 06/21/2007
• Est. Priority Date: 12/16/2005
• Status: Abandoned Application

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Vega-Garcia, Andres
• Application Number:
  US11/275,194
• Publication Number:
  US 20070140116A1
• Time in Patent Office: Days
• US Class Current: 370/230
• CPC Class Codes: H04L 43/0829 Packet loss
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/38 by adapting coding or compression rate
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 65/752 adapting media to network capabilities
• CPC Class Codes: H04L 65/756 adapting media to device capabilities
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04M 7/0072 Speech codec negotiation H04L65/1069 takes precedence

Abstract

A codec selection process is independent of a codec source. A codec table may be used that includes indexed codec references related to codecs stored in a codec source. The codec table and the codec source may be modified without affecting a codec selection process. This feature of an exemplary implementation makes it fairly straightforward to add, change, or otherwise modify codecs stored in the codec source and referenced in the codec table without having to change the codec selection process.

Claims

1. A method implemented at least in part by a computing device, comprising:

determining available network bandwidth; and

selecting, from a collection of codecs dissociated from a codec selection process, at least one codec based on at least the determined available network bandwidth.

2. A method as recited in claim 1, wherein the collection of codecs is part of at least one codec table stored in a computing device.

3. A method as recited in claim 1, wherein determining the available network bandwidth includes evaluating at least one of an amount of available bandwidth provided by a current communication session, a quality of a communication medium, and characteristics of one or more media signals for encoding.

4. A method as recited in claim 1, further comprising encoding a plurality of media signals only if the available network bandwidth is capable of supporting communication of the plurality of medial signals.

5. A method as recited in claim 4, wherein the plurality of media signals include a primary media signal and a secondary media signal.

6. A method as recited in claim 1, wherein selecting includes selecting a codec for a primary media signal and selecting another codec for a secondary media signal if the available network bandwidth is sufficient to support communication of encoded versions of the primary media signal and the secondary media signal simultaneously.

7. A method as recited in claim 1, further comprising:

evaluating if the available bandwidth is sufficient to support communication of a primary media signal and a secondary media signal; and

reevaluating if the available bandwidth is sufficient to support communication of a primary media signal and a secondary media signal after a codec is selected for encoding the primary medial signal.

8. A method as recited in claim 1, further comprising encoding only one of a plurality of media signals if the available network bandwidth is only capable of supporting communication of one of the plurality of medial signals.

9. A method as recited in claim 8, wherein the plurality of media signals includes an audio signal and a video signal, the audio signal being encoded in the act of encoding.

10. A computing device, comprising:

a codec selection module including computer-executable instructions for selecting codecs usable to encode media signals; and

a modifiable codec selection table independent of the codec selection module, the modifiable codec selection table including codec references selectable using the instructions of the codec selection module.

11. A system as recited in claim 10, wherein the modifiable codec selection table includes codecs references related to codecs used to encode audio and video media signals.

12. A system as recited in claim 10, further comprising a codec repository storing codecs referenced in the modifiable codec section table.

13. A system as recited in claim 10, wherein the modifiable codec selection table is modifiable or otherwise alterable without affecting the instructions of the codec selection module.

14. A system as recited in claim 10, wherein each of the codec references of the modifiable codec selection table includes a codec name field, a score field and a maximum bit rate field.

15. A system as recited in claim 10, further comprising a compression module that uses codecs to compress media signals.

16. A media encoding arrangement, comprising:

a codec table module having a plurality of codec references, each codec reference including a codec name field and a bit rate field; and

a codec repository including codecs referenced by the codec table module,

wherein changes to the codec table module and the codec repository do not affect a process for selecting codec references of the codec table module and codecs stored in the codec repository.

17. An arrangement as recited in claim 16, wherein each of the codec references includes a codec name field, a bit rate field and a score field, the codec name filed includes a name of a codec stored in the codec repository, the bit rate field includes a bit rate value that represents a maximum network bandwidth that is required by a codec identified in the codec name field, and the score field includes a score value representative of a computing device'"'"'s processing capability.

18. An arrangement as recited in claim 16, wherein the codec table module includes an audio table with references to audio codecs and a video table with references to video codecs.

19. An arrangement as recited in claim 16, further comprising a codec selection process module that is independent of the codec table module and the codec repository.

20. An arrangement as recited in claim 19, wherein the codec selection process module includes computer-executable instructions for selecting codec references identified in the codec table module.