Context adaptive binary arithmetic decoding for high definition video
An apparatus comprising a first circuit and a second circuit. The first circuit may be configured to present a video signal and macroblock data in response to decoding one or more bins on a binary signal. The second circuit may be configured to, in parallel (i) generate the binary signal in response to a bitstream signal and an initial context information and (ii) calculate subsequent context information.
1. An apparatus comprising:
a first circuit configured to present a video signal and macroblock data in response to decoding one or more bins on a binary signal; and
a second circuit configured to, in parallel (i) generate said binary signal in response to a bitstream signal and an initial context information and (ii) calculate subsequent context information, wherein said second circuit is configured to (i) parse H.264 bin grammar of said one or more bins, (ii) determine a syntax element from said H.264 bin grammar and a bit index position within said determined syntax element and (iii) pre-decode said syntax elements needed to calculate a first context information and a second context information, wherein (A) said second circuit is configured to calculate said second context information by evaluating whether said value of said bin currently decoded in said first circuit is a second predetermined value, (B) said second circuit is configured to select (i) said first context information if said bin currently decoded in said first circuit is said first predetermined value and (ii) said second context information if said bin currently decoded in said first circuit is said second predetermined value and (C) said second circuit comprises a bin state machine configured to present data of a current macroblock.
2. The apparatus according to claim 1 , wherein said second circuit comprises an arithmetic decoder configured to arithmetically decode said context information.
3. The apparatus according to claim 2 , wherein said second circuit comprises a first context determination circuit configured to calculate said first context information by evaluating whether a value of said bin currently being decoded in said first circuit is a first predetermined value.
4. The apparatus according to claim 3 , wherein said second circuit comprises a second context determination circuit.
5. The apparatus according to claim 4 , wherein said second circuit comprises a multiplexer.
6. The apparatus according to claim 2 , wherein said second circuit comprises one or more registers configured to generate data of a left neighboring macroblock in response to data of a current neighboring macroblock.
7. The apparatus according to claim 6 , wherein said second circuit comprises a synchronous dynamic access memory configured to generate data for an above neighboring macroblock in response to said data of a current neighboring macroblock.
8. The apparatus according to claim 7 , wherein said first circuit comprises a decoder configured to (i) decode said one or more bins on said binary signal and (ii) generate said video signal and said macroblock data.
9. The apparatus according to claim 1 , wherein said bitstream signal comprises a high definition bitstream.