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adjusted sad_per_bit to correlate with quantizer 

Re-calibrated sad_per_bit16 and sad_per_bit4 tables to linearly
correlated to quantizer values, these two variables are used in
motion search for costing motion vectors. This change has an small
positive effect on compression.

Change-Id: Ic9b5ea6fb8d5078ef663ba4899db019cc51f4166
This commit is contained in:
Yaowu Xu 2010-12-23 19:59:12 -08:00
Родитель 8c4552fb36
Коммит 0f5264b584
1 изменённых файлов: 35 добавлений и 40 удалений
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75
vp8/encoder/rdopt.c
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@ -173,45 +173,44 @@ static int rd_iifactor [ 32 ] = { 4, 4, 3, 2, 1, 0, 0, 0,
};
// The values in this table should be reviewed
static int sad_per_bit16lut[128] =
/* values are now correlated to quantizer */
static int sad_per_bit16lut[QINDEX_RANGE] =
{
4, 4, 4, 4, 4, 4, 4, 4, // 4
4, 4, 4, 4, 4, 4, 4, 4, // 1
4, 4, 4, 4, 4, 4, 4, 4, // 2
4, 4, 4, 4, 4, 4, 4, 4, // 3
4, 4, 4, 4, 4, 4, 4, 4, // 4
4, 4, 12, 12, 13, 13, 14, 14, // 5
14, 14, 14, 15, 15, 15, 15, 15, // 6
15, 15, 15, 15, 15, 15, 15, 15, // 7
15, 15, 15, 15, 15, 16, 16, 16, // 8
16, 16, 18, 18, 18, 18, 19, 19, // 9
19, 19, 19, 19, 19, 19, 19, 19, // 10
20, 20, 22, 22, 22, 22, 21, 21, // 11
22, 22, 22, 22, 22, 22, 22, 22, // 12
22, 22, 22, 22, 22, 22, 22, 22, // 13
22, 22, 22, 22, 22, 22, 22, 22, // 14
22, 22, 22, 22, 22, 22, 22, 22, // 15
5, 5, 5, 5, 5, 5, 6, 6,
6, 6, 6, 6, 6, 7, 7, 7,
7, 7, 7, 7, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 9, 9,
9, 9, 9, 9, 10, 10, 10, 10,
10, 10, 11, 11, 11, 11, 11, 11,
12, 12, 12, 12, 12, 12, 12, 13,
13, 13, 13, 13, 13, 14, 14, 14,
14, 14, 15, 15, 15, 15, 15, 15,
16, 16, 16, 16, 16, 16, 17, 17,
17, 17, 17, 17, 17, 18, 18, 18,
18, 18, 19, 19, 19, 19, 19, 19,
20, 20, 20, 21, 21, 21, 21, 22,
22, 22, 23, 23, 23, 24, 24, 24,
25, 25, 26, 26, 27, 27, 27, 28,
28, 28, 29, 29, 30, 30, 31, 31
};
static int sad_per_bit4lut[128] =
static int sad_per_bit4lut[QINDEX_RANGE] =
{
4, 4, 4, 4, 4, 4, 4, 4, // 4
4, 4, 4, 4, 4, 4, 4, 4, // 1
4, 4, 4, 4, 4, 4, 4, 4, // 2
4, 4, 4, 4, 4, 4, 4, 4, // 3
4, 4, 4, 4, 4, 4, 4, 4, // 4
4, 4, 15, 15, 15, 15, 16, 16, // 5
16, 17, 17, 17, 17, 17, 17, 17, // 6
17, 17, 19, 19, 22, 22, 21, 21, // 7
23, 23, 23, 23, 23, 24, 24, 24, // 8
25, 25, 27, 27, 27, 27, 28, 28, // 9
28, 28, 29, 29, 29, 29, 29, 29, // 10
30, 30, 31, 31, 31, 31, 32, 32, // 11
34, 34, 34, 34, 34, 34, 34, 34, // 12
34, 34, 34, 34, 34, 34, 34, 34, // 13
34, 34, 34, 34, 34, 34, 34, 34, // 14
34, 34, 34, 34, 34, 34, 34, 34, // 15
5, 5, 5, 5, 5, 5, 7, 7,
7, 7, 7, 7, 7, 8, 8, 8,
8, 8, 8, 8, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 11, 11,
11, 11, 11, 11, 13, 13, 13, 13,
13, 13, 14, 14, 14, 14, 14, 14,
16, 16, 16, 16, 16, 16, 16, 17,
17, 17, 17, 17, 17, 19, 19, 19,
19, 19, 20, 20, 20, 20, 20, 20,
22, 22, 22, 22, 22, 22, 23, 23,
23, 23, 23, 23, 23, 25, 25, 25,
25, 25, 26, 26, 26, 26, 26, 26,
28, 28, 28, 29, 29, 29, 29, 31,
31, 31, 32, 32, 32, 34, 34, 34,
35, 35, 37, 37, 38, 38, 38, 40,
40, 40, 41, 41, 43, 43, 44, 44,
};
void vp8cx_initialize_me_consts(VP8_COMP *cpi, int QIndex)
@ -262,10 +261,6 @@ void vp8_initialize_rd_consts(VP8_COMP *cpi, int Qvalue)
cpi->RDMULT = 125;
cpi->mb.errorperbit = (cpi->RDMULT / 100);
if (cpi->mb.errorperbit < 1)
cpi->mb.errorperbit = 1;
vp8_set_speed_features(cpi);
if (cpi->common.simpler_lpf)