Method and system for generating a transform size syntax element for video decoding
In a video processing system, a method and system for generating a transform size syntax element for video decoding are provided. For high profile mode video decoding operations, the transform sizes may be selected based on the prediction macroblock type and the contents of the macroblock. A set of rules may be utilized to select from a 4.×.4 or an 8.×.8 transform size during the encoding operation. Dynamic selection of transform size may be performed on intra-predicted macroblocks, inter-predicted macroblocks, and/or direct mode inter-predicted macroblocks. The encoding operation may generate a transform size syntax element to indicate the transform size that may be used in reconstructing the encoded macroblock. The transform size syntax element may be transmitted to a decoder as part of the encoded video information bit stream.
1. A device for video signal processing, the device comprising:
circuitry that is configured to:
receive an intra-predicted macroblock;
receive a macroblock type of the intra-predicted macroblock indicating a transform size;
receive a transform syntax element generated based on the transform size that indicates an inverse transform size for use with the intra-predicted macroblock,
derive, based on the macroblock type, a flag indicating whether a sub-partition of the intra-predicted macroblock uses a size other than 8×8;
select a transform size based on the macroblock type, transform syntax element and the flag;
inverse transform the received macroblock based on the selected inverse transform size to generate an inverse transformed macroblock;
reconstruct a reconstructed macroblock based on the inverse transformed macroblock; and
deblock filter the reconstructed macroblock,
wherein selecting the transform size includes selecting an N×N transform size when the macroblock type is an N×N macroblock type and selecting an M×M transform size when the macroblock type is an M×M macroblock type, wherein N and M are integer values and M is greater than N.