[x265] fix cbf context

[Steve Borho]

On 09/05, Satoshi Nakagawa wrote:
> # HG changeset patch
> # User Satoshi Nakagawa <nakagawa424 at oki.com>
> # Date 1409843113 -32400
> #      Fri Sep 05 00:05:13 2014 +0900
> # Node ID 85a4327fe163a91b4725891515234c87e1153289
> # Parent  b686cb0abd713f6fefcc75d00725232d12e36089
> fix cbf context

Does this fix coding errors? or just compression loss?

> diff -r b686cb0abd71 -r 85a4327fe163 source/Lib/TLibCommon/ContextTables.h
> --- a/source/Lib/TLibCommon/ContextTables.h	Thu Sep 04 17:06:16 2014 +0530
> +++ b/source/Lib/TLibCommon/ContextTables.h	Fri Sep 05 00:05:13 2014 +0900
> @@ -65,7 +65,7 @@
>  
>  #define NUM_REF_NO_CTX                2       ///< number of context models for reference index
>  #define NUM_TRANS_SUBDIV_FLAG_CTX     3       ///< number of context models for transform subdivision flags
> -#define NUM_QT_CBF_CTX                6       ///< number of context models for QT CBF
> +#define NUM_QT_CBF_CTX                7       ///< number of context models for QT CBF
>  #define NUM_QT_ROOT_CBF_CTX           1       ///< number of context models for QT ROOT CBF
>  #define NUM_DELTA_QP_CTX              3       ///< number of context models for dQP
>  
> @@ -144,7 +144,7 @@
>  #define NEIGHBOURHOOD_00_CONTEXT_1_THRESHOLD_4x4  3
>  #define NEIGHBOURHOOD_00_CONTEXT_2_THRESHOLD_4x4  1
>  
> -static const uint32_t ctxCbf[3][3] = { { 1, 0, 0 }, { 2, 3, 4 }, { 2, 3, 4} };
> +static const uint32_t ctxCbf[3][5] = { { 1, 0, 0, 0, 0 }, { 2, 3, 4, 5, 6 }, { 2, 3, 4, 5, 6 } };
>  static const uint32_t significanceMapContextSetStart[MAX_NUM_CHANNEL_TYPE][3] = { { 0,  9, 21 }, { 0,  9, 12 } };
>  static const uint32_t significanceMapContextSetSize[MAX_NUM_CHANNEL_TYPE][3]  = { { 9, 12,  6 }, { 9,  3,  3 } };
>  static const uint32_t nonDiagonalScan8x8ContextOffset[MAX_NUM_CHANNEL_TYPE]   = {  6, 0  };
> @@ -259,9 +259,9 @@
>  static const uint8_t
>      INIT_QT_CBF[3][NUM_QT_CBF_CTX] =
>  {
> -    { 153,  111,  149,   92,  167,  154, },
> -    { 153,  111,  149,  107,  167,  154, },
> -    { 111,  141,   94,  138,  182,  154, },
> +    { 153,  111,  149,   92,  167,  154,  154 },
> +    { 153,  111,  149,  107,  167,  154,  154 },
> +    { 111,  141,   94,  138,  182,  154,  154 },
>  };
>  
>  static const uint8_t
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-- 
Steve Borho