Method of CABAC coefficient magnitude and sign decoding suitable for use on VLIW data processors
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United States of America Patent
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Feb 8, 2011
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app pub date -
Apr 26, 2007
filing date -
Apr 26, 2007
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Abstract
This invention decodes coefficient magnitudes in compressed video data using a selected context and speculatively decodes a coefficient sign. The next context selection depends upon a number of iterations. This invention confirms the speculatively decoded coefficient sign upon completion of the magnitude decode. This invention operates in a loop until reaching the number of significant coefficients within the block. The method exits the loop and decodes an escape code if an iteration count is greater than a predetermined number. An embodiment of this invention collects both a count up and a count down in an escape code decode in one loop. An embodiment of this invention estimates the number of significant coefficients in a block and selects the inventive or a prior art decode.
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