[x265] [PATCH] lambda: New 10-bit and 12-bit lambda2 table

[Pradeep Ramachandran]

On Tue, Apr 18, 2017 at 11:18 PM, <santhoshini at multicorewareinc.com> wrote:

> # HG changeset patch
> # User Santhoshini Sekar <santhoshini at multicorewareinc.com>
> # Date 1492074513 -19800
> #      Thu Apr 13 14:38:33 2017 +0530
> # Node ID a7666d5948f9d10c0e8cd5fda6f936962146756a
> # Parent  0b7d54dbb71a87a0c6514fee04a51c4b29d5d704
> lambda: New 10-bit and 12-bit lambda2 table.
>

Updated on default branch. Will be part of next release.


>
> diff --git a/source/common/constants.cpp b/source/common/constants.cpp
> --- a/source/common/constants.cpp
> +++ b/source/common/constants.cpp
> @@ -49,23 +49,23 @@
>      7298.2423, 8192.0000, 9195.2091, 10321.2732, 11585.2375
>  };
>
> -// lambda2 = pow(lambda, 2) * scale (0.85);
> +// lambda2 = 0.038 * EXP(0.234 * QP) * 256;
>  double x265_lambda2_tab[QP_MAX_MAX + 1] =
>  {
> -    13.6000,       17.1349,       21.5887,       27.2000,       34.2699,
> -    43.1773,       54.4000,       68.5397,       86.3546,       108.8000,
> -    137.0794,      172.7092,      217.6000,      274.1588,      345.4185,
> -    435.2000,      548.3176,      690.8369,      870.4000,      1096.6353,
> -    1381.6739,     1740.8000,     2193.2706,     2763.3478,     3481.6000,
> -    4386.5411,     5526.6955,     6963.2000,     8773.0822,
>  11053.3910,
> -    13926.4000,    17546.1645,    22106.7819,    27852.8000,
> 35092.3291,
> -    44213.5641,    55705.6000,    70184.6579,    88427.1282,
> 111411.2000,
> -    140369.3159,   176854.2563,   222822.4000,   280738.6324,
>  353708.5127,
> -    445644.8001,   561477.2648,   707417.0237,   891289.6000,
>  1122954.5277,
> -    1414834.0484,  1782579.2003,  2245909.0566,  2829668.0981,
> 3565158.4000,
> -    4491818.1146,  5659336.1938,  7130316.8013,  8983636.2264,
> 11318672.3923,
> -    14260633.6000, 17967272.4585, 22637344.7751, 28521267.1953,
> 35934544.9165,
> -    45274689.5567, 57042534.4000, 71869089.8338, 90549379.1181,
> 114085068.8008
> +    9.7280,        12.2880,       15.5136,       19.6096,       24.7808,
> +    31.3344,       39.6032,       50.0480,       63.2320,       79.8976,
> +    100.9664,      127.5904,      161.2544,      203.7504,      257.4848,
> +    325.3760,      411.1616,      519.5520,      656.5376,      829.6448,
> +    1048.3712,     1324.7744,     1674.0608,     2115.4048,     2673.1264,
> +    3377.8944,     4268.4416,     5393.7920,     6815.8464,     8612.8128,
> +    10883.5328,    13752.9344,    17378.8160,    21960.6528,
> 27750.4768,
> +    35066.7264,    44311.8848,    55994.4704,    70757.0944,
> 89411.8144,
> +    112984.7552,   142772.5824,   180413.7728,   227978.8800,
>  288084.2496,
> +    364036.0960,   460012.2112,   581291.8784,   734546.3040,
>  928205.3888,
> +    1172921.6256,  1482155.9552,  1872918.2208,  2366702.7968,
> 2990670.9504,
> +    3779144.8832,  4775495.6288,  6034528.7424,  7625499.0080,
> 9635919.8464,
> +    12176377.0368, 15386611.7888, 19443207.2448, 24569301.7344,
> 31046862.8224,
> +    39232197.1968, 49575549.9264, 62645870.6176, 79162109.3632,
> 100032763.4688
>  };
>
>  #elif X265_DEPTH == 10
> @@ -89,23 +89,23 @@
>      1824.5606, 2048.0000, 2298.8023, 2580.3183, 2896.3094,
>  };
>
> -// lambda2 = pow(lambda, 2) * scale (0.85);
> +// lambda2 = 0.038 * exp(0.234 * QP) * 16;
>  double x265_lambda2_tab[QP_MAX_MAX + 1] =
>  {
> -    0.8500, 1.0709, 1.3493, 1.7000, 2.1419,
> -    2.6986, 3.4000, 4.2837, 5.3972, 6.8000,
> -    8.5675, 10.7943, 13.6000, 17.1349, 21.5887,
> -    27.2000, 34.2699, 43.1773, 54.4000, 68.5397,
> -    86.3546, 108.8000, 137.0794, 172.7092, 217.6000,
> -    274.1588, 345.4185, 435.2000, 548.3176, 690.8369,
> -    870.4000, 1096.6353, 1381.6739, 1740.8000, 2193.2706,
> -    2763.3478, 3481.6000, 4386.5411, 5526.6955, 6963.2000,
> -    8773.0823, 11053.3910, 13926.4000, 17546.1645, 22106.7820,
> -    27852.8000, 35092.3290, 44213.5640, 55705.6000, 70184.6580,
> -    88427.1280, 111411.2000, 140369.3161, 176854.2561, 222822.4000,
> -    280738.6321, 353708.5122, 445644.8000, 561477.2643, 707417.0243,
> -    891289.6000, 1122954.5286, 1414834.0486, 1782579.2000, 2245909.0572,
> -    2829668.0973, 3565158.4000, 4491818.1144, 5659336.1946, 7130316.8000,
> +    0.6080, 0.7680, 0.9696, 1.2256, 1.5488,
> +    1.9584, 2.4752, 3.1280, 3.9520, 4.9936,
> +    6.3104, 7.9744, 10.0784, 12.7344, 16.0928,
> +    20.3360, 25.6976, 32.4720, 41.0336, 51.8528,
> +    65.5232, 82.7984, 104.6288, 132.2128, 167.0704,
> +    211.1184, 266.7776, 337.1120, 425.9904, 538.3008,
> +    680.2208, 859.5584, 1086.1760, 1372.5408, 1734.4048,
> +    2191.6704, 2769.4928, 3499.6544, 4422.3184, 5588.2384,
> +    7061.5472, 8923.2864, 11275.8608, 14248.6800, 18005.2656,
> +    22752.2560, 28750.7632, 36330.7424, 45909.1440, 58012.8368,
> +    73307.6016, 92634.7472, 117057.3888, 147918.9248, 186916.9344,
> +    236196.5552, 298468.4768, 377158.0464, 476593.6880, 602244.9904,
> +    761023.5648, 961663.2368, 1215200.4528, 1535581.3584, 1940428.9264,
> +    2452012.3248, 3098471.8704, 3915366.9136, 4947631.8352, 6252047.7168
>  };
>
>  #else /* !HIGH_BIT_DEPTH */
>
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