Modification of picture parameter set (pps) for hevc extensions

Abstract

A method, apparatus, article of manufacture, and a memory structure for signaling extension functions used in decoding a sequence comprising a plurality of pictures, each picture processed at least in part according to a picture parameter set is disclosed. In one embodiment, the method comprises reading a first extension flag signaling a first extension function in the processing of the sequence and determining if the first extension flag has a first value. Further, the method reads a second extension flag signaling a second extension function in the processing of the sequence and performs the second extension function according to the read second extension flag only if the first extension flag has a first value.

What is claimed is: 
     
         1 . In a processing device for decoding a sequence comprising a plurality of pictures, each picture processed at least in part according to a picture parameter set, a method of processing the sequence, comprising:
 reading a first extension flag signaling a first extension function in the processing of the sequence;   determining if the first extension flag has a first value;   only if the first extension flag has a first value:
 reading a second extension flag signaling a second extension function in the processing of the sequence; and 
 performing the second extension function according to the read second extension flag. 
   
     
     
         2 . The method of  claim 1 , further comprising:
 performing the first extension function according to the read first extension flag after reading the first extension flag and before reading the second extension flag; and   performing the second extension function according to the read second extension flag after reading the second extension flag.   
     
     
         3 . The method of  claim 2 , wherein the second extension function is functionally related to the first extension function. 
     
     
         4 . The method of  claim 2 , wherein the second extension function is only implicated in the processing sequence if the first extension function is implicated in the processing sequence. 
     
     
         5 . The method of  claim 2 , wherein the first extension function comprises a discrete cosine transforming skip operation. 
     
     
         6 . The method of  claim 2 , wherein:
 the processed picture comprises a plurality of transform units;   the processing of the sequence comprises:
 discrete cosine transforming at least some of the plurality of transform units of the processed picture; and 
 skipping discrete cosine transforming of other of the plurality of transform units at least in part according to a maximum permitted size of the transform unit; and 
   the first extension function comprises reading a value indicating the maximum permitted size of the transform unit for which discrete cosine transforming may be skipped.   
     
     
         7 . The method of  claim 2 , wherein the first function further comprises a flag read operation signaling the second function. 
     
     
         8 . An apparatus for decoding a sequence comprising a plurality of pictures, each picture processed at least in part according to a picture parameter set, the apparatus, comprising:
 a processor;   a memory, communicatively coupled to the processor, the memory storing a plurality of instructions comprising instructions for:
 reading a first extension flag signaling a first extension function in the processing of the sequence; 
 determining if the first extension flag has a first value; 
 only if the first extension flag has a first value:
 reading a second extension flag signaling a second extension function in the processing of the sequence; and 
 performing the second extension function according to the read second extension flag. 
 
   
     
     
         9 . The apparatus of  claim 8 , wherein the instructions further comprise:
 performing the first extension function according to the read first extension flag after reading the first extension flag and before reading the second extension flag; and   performing the second extension function according to the read second extension flag after reading the second extension flag.   
     
     
         10 . The apparatus of  claim 9 , wherein the second extension function is functionally related to the first extension function. 
     
     
         11 . The apparatus of  claim 9 , wherein the second extension function is only implicated in the processing sequence if the first extension function is implicated in the processing sequence. 
     
     
         12 . The apparatus of  claim 9 , wherein the first extension function comprises a discrete cosine transforming skip operation. 
     
     
         13 . The apparatus of  claim 9 , wherein:
 the processed picture comprises a plurality of transform units;   the instructions for processing of the sequence comprise:
 discrete cosine transforming at least some of the plurality of transform units of the processed picture; and 
 skipping discrete cosine transforming of other of the plurality of transform units at least in part according to a maximum permitted size of the transform unit; and 
   the first extension function comprises reading a value indicating the maximum permitted size of the transform unit for which discrete cosine transforming may be skipped.   
     
     
         14 . The apparatus of  claim 2 , wherein the first function further comprises a flag read operation signaling the second function. 
     
     
         15 . A device for decoding a sequence comprising a plurality of pictures, each picture processed at least in part according to a picture parameter set, a method of processing the sequence, comprising:
 means for reading a first extension flag signaling a first extension function in the processing of the sequence;   means for determining if the first extension flag has a first value;   means for reading a second extension flag signaling a second extension function in the processing of the sequence and performing the second extension function according to the read second extension flag only if the first extension flag has a first value.   
     
     
         16 . The device of  claim 15 , further comprising:
 means for performing the first extension function according to the read first extension flag after reading the first extension flag and before reading the second extension flag; and   means for performing the second extension function according to the read second extension flag after reading the second extension flag.   
     
     
         17 . The device of  claim 15 , wherein the second extension function is functionally related to the first extension function. 
     
     
         18 . The device of  claim 15 , wherein the second extension function is only implicated in the processing sequence if the first extension function is implicated in the processing sequence. 
     
     
         19 . The device of  claim 2 , wherein the first extension function comprises a discrete cosine transforming skip operation. 
     
     
         20 . The device of  claim 2 , wherein:
 the processed picture comprises a plurality of transform units;   the means for processing of the sequence comprises:
 means for discrete cosine transforming at least some of the plurality of transform units of the processed picture; and 
 means for skipping discrete cosine transforming of other of the plurality of transform units at least in part according to a maximum permitted size of the transform unit; and 
   the first extension function comprises reading a value indicating the maximum permitted size of the transform unit for which discrete cosine transforming may be skipped.