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 method for decoding a coded picture, the method comprising:
receiving an intra-predicted macroblock;
receiving a macroblock type of the intra-predicted macroblock indicating a size;
selecting a transform size having a same size as the size of the macroblock type;
receiving a transform syntax element generated based on the transform size that indicates an inverse transform size for use with the intra-predicted macroblock;
re-scaling and inverse transforming the received macroblock based on the selected inverse transform size to generate an inverse transformed macroblock; and
reconstructing a reconstructed macroblock based on the inverse transformed 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 MxM 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.