Commit 0ba32632 authored by Paul Wilkins's avatar Paul Wilkins

ARNR Lookup Table.

Change submitted for Adrian Grange. Convert threshold
calculation in ARNR filter to a lookup table.

Change-Id: I12a4bbb96b9ce6231ce2a6ecc2d295610d49e7ec
parent 02277b8a
......@@ -3214,8 +3214,21 @@ void write_cx_frame_to_file(YV12_BUFFER_CONFIG *frame, int this_frame)
}
#endif
// return of 0 means drop frame
#define USE_FILTER_LUT 1
#if VP8_TEMPORAL_ALT_REF
#if USE_FILTER_LUT
static int modifier_lut[7][19] =
{
16, 13, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Strength=0
16, 15, 10, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Strength=1
16, 15, 13, 9, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Strength=2
16, 16, 15, 13, 10, 7, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Strength=3
16, 16, 15, 14, 13, 11, 9, 7, 4, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Strength=4
16, 16, 16, 15, 15, 14, 13, 11, 10, 8, 7, 5, 3, 0, 0, 0, 0, 0, 0, // Strength=5
16, 16, 16, 16, 15, 15, 14, 14, 13, 12, 11, 10, 9, 8, 7, 5, 4, 2, 1// Strength=6
};
#endif
static void vp8cx_temp_blur1_c
(
VP8_COMP *cpi,
......@@ -3239,6 +3252,9 @@ static void vp8cx_temp_blur1_c
int block_ofset;
int cols;
unsigned char Shift = (block_size == 16) ? 4 : 3;
#if USE_FILTER_LUT
int *lut = modifier_lut[strength];
#endif
cols = cpi->common.mb_cols;
......@@ -3265,7 +3281,12 @@ static void vp8cx_temp_blur1_c
{
// get current frame pixel value
int pixel_value = frames[frame][byte];
#if USE_FILTER_LUT
// LUT implementation --
// improves precision of filter
modifier = abs(src_byte-pixel_value);
modifier = modifier>18 ? 0 : lut[modifier];
#else
modifier = src_byte;
modifier -= pixel_value;
modifier *= modifier;
......@@ -3276,7 +3297,7 @@ static void vp8cx_temp_blur1_c
modifier = 16;
modifier = 16 - modifier;
#endif
accumulator += modifier * pixel_value;
count += modifier;
......
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