Granted Patent B2

US 7,245,242 · App. 11/287,630 · Granted Jul 17, 2007

Abstract

Claims (27)

1. A decoding method, comprising:

receiving a slice comprising a plurality of context adaptive binary arithmetic coding (CABAC) encoded symbols;

retrieving context information corresponding to previously decoded macroblocks;

retrieving context state information based on the context information; and

decoding the slice without processor intervention.

2. The method of claim 1 , further comprising updating the context state information responsive to each symbol decoding.

3. The method of claim 1 , further comprising updating the context information based on decoding all macroblock syntax elements of the slice.

4. The method of claim 1 , wherein decoding comprises symbol decoding in each clock cycle.

5. A decoding system, comprising:

a macroblock decode module configured to decode a plurality of context adaptive binary arithmetic coding (CABAC) encoded symbols corresponding to a slice without processor intervention, and wherein the macroblock decode module comprising a symbol decode module configured to perform symbol decoding in each clock cycle, and the macroblock decode module comprising a plurality of syntax decoders configured to retrieve context information from a register and determine a context ID based on the context information.

6. The system of claim 5 , wherein the macroblock decode module comprises a decoding control module configured to determine which of the plurality of syntax decoders is to drive the symbol decode module based on previously decoded syntax elements.

7. The system of claim 6 , wherein the macroblock decode module comprises a switch module which, responsive to communication by the decoding control module, selects one of the plurality of the syntax decoders to drive the symbol decode module.

8. The system of claim 7 , wherein the selected syntax decoder provides the context ID to the symbol decode module.

9. The system of claim 5 , wherein the macroblock decode module comprises a context control module and symbol context memory, wherein the context control module is configured to retrieve context state information based on the context ID from the symbol context memory and provide the context state information to the symbol decode module.

10. The system of claim 9 , wherein the macroblock decode module is configured to decode one of the plurality of symbols based on the context state information.

11. The system of claim 9 , wherein the symbol decode module is configured to decode the symbols.

12. The system of claim 5 , further comprising a control module and stream buffer and decode system configured to decode slice headers and detect start codes.

13. The system of claim 5 , further comprising a control module configured to program slice parameters into the macroblock decode module and instruct the macroblock decode module to commence decoding of macroblock data.

14. The system of claim 5 , further comprising a row store buffer coupled to the macroblock decode module and configured to store context information corresponding to previously decoded macroblocks.

15. The system of claim 5 , wherein the macroblock decode module comprises a context adaptive binary arithmetic coding (CABAC) decoder.

16. A decoding system, comprising:

means for receiving a slice comprising a plurality of context adaptive binary arithmetic coding (CABAC) encoded symbols;

means for retrieving context information corresponding to previously decoded macroblocks;

means for retrieving context state information based on the context information; and

means for decoding the slice without processor intervention.

17. The system of claim 5 , wherein the macroblock decode module is embodied in a wired device or a wireless device.

18. The system of claim 5 , wherein the macroblock decode module is embodied in a computer, consumer electronic device, set-top box, television set, video storage system, telecommunication device, or personal digital assistant (PDA).

Assignments (7)