[x265] Optimize slice QP in PPS for x265 (xuefeng)

[xuefeng]

hello Min,
Thanks for your reply.

a）
deltaQp = sliceQp - ppsQp
ppsQp is saved in PPS and deltaQp is saved in bitstream.  
In fact, I don't calculate new QP, but calculate a best delta for ppsQP and deltaQp without changing sliceQp.
For example,  deltaQp = 14(cost 4 bits),  sliceQp = 40, and ppsQp = 26
If we set deltaQp = 14 - 14 = 0 ( cost 1 bits)  and ppsQp = 26 + 14 = 40,  sliceQp is still 40.  Then we save 3 - 1 = 2 bits in bitstream for each slice.

b)
I have change QP Range with range extension. Please see this patch.



Regards,
 
             Xuefeng Jiang
 
xuefeng at multicorewareinc.com

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