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Use sharp filter for alter reference frame generation 

This commit uses 12-tap sharp filter to generate alter reference
frame. It improves the compression performance by
derf    0.45%
hevcmr  0.35%
stdhd   0.79%

No encoding time change is observed.

Change-Id: Ia5dc26d5aae6b9b0cb782e5a28dc5066eeeb2ec8
This commit is contained in:
Jingning Han 2016-02-24 15:33:10 -08:00
Родитель 47bc2a5741
Коммит 72eda13e50
3 изменённых файлов: 46 добавлений и 25 удалений
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54
vp10/common/filter.c
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@ -32,6 +32,27 @@ DECLARE_ALIGNED(256, static const InterpKernel,
{ 0, 0, 0, 8, 120, 0, 0, 0 }
};
DECLARE_ALIGNED(16, static const int16_t,
sub_pel_filters_12sharp[16][12]) = {
// intfilt 0.8
{0, 0, 0, 0, 0, 128, 0, 0, 0, 0, 0, 0},
{0, 1, -1, 3, -7, 127, 8, -4, 2, -1, 0, 0},
{0, 1, -3, 5, -12, 124, 18, -8, 4, -2, 1, 0},
{-1, 2, -4, 8, -17, 120, 28, -11, 6, -3, 1, -1},
{-1, 2, -4, 10, -21, 114, 38, -15, 8, -4, 2, -1},
{-1, 3, -5, 11, -23, 107, 49, -18, 9, -5, 2, -1},
{-1, 3, -6, 12, -25, 99, 60, -21, 11, -6, 3, -1},
{-1, 3, -6, 12, -25, 90, 70, -23, 12, -6, 3, -1},
{-1, 3, -6, 12, -24, 80, 80, -24, 12, -6, 3, -1},
{-1, 3, -6, 12, -23, 70, 90, -25, 12, -6, 3, -1},
{-1, 3, -6, 11, -21, 60, 99, -25, 12, -6, 3, -1},
{-1, 2, -5, 9, -18, 49, 107, -23, 11, -5, 3, -1},
{-1, 2, -4, 8, -15, 38, 114, -21, 10, -4, 2, -1},
{-1, 1, -3, 6, -11, 28, 120, -17, 8, -4, 2, -1},
{0, 1, -2, 4, -8, 18, 124, -12, 5, -3, 1, 0},
{0, 0, -1, 2, -4, 8, 127, -7, 3, -1, 1, 0},
};
DECLARE_ALIGNED(256, static const InterpKernel,
sub_pel_filters_8[SUBPEL_SHIFTS]) = {
#if CONFIG_EXT_INTERP
@ -157,28 +178,6 @@ DECLARE_ALIGNED(256, static const InterpKernel,
{0, 2, -12, 37, 94, 14, -9, 2},
{0, 2, -11, 31, 95, 19, -10, 2},
};
DECLARE_ALIGNED(16, static const int16_t,
sub_pel_filters_12sharp[16][12]) = {
// intfilt 0.8
{0, 0, 0, 0, 0, 128, 0, 0, 0, 0, 0, 0},
{0, 1, -1, 3, -7, 127, 8, -4, 2, -1, 0, 0},
{0, 1, -3, 5, -12, 124, 18, -8, 4, -2, 1, 0},
{-1, 2, -4, 8, -17, 120, 28, -11, 6, -3, 1, -1},
{-1, 2, -4, 10, -21, 114, 38, -15, 8, -4, 2, -1},
{-1, 3, -5, 11, -23, 107, 49, -18, 9, -5, 2, -1},
{-1, 3, -6, 12, -25, 99, 60, -21, 11, -6, 3, -1},
{-1, 3, -6, 12, -25, 90, 70, -23, 12, -6, 3, -1},
{-1, 3, -6, 12, -24, 80, 80, -24, 12, -6, 3, -1},
{-1, 3, -6, 12, -23, 70, 90, -25, 12, -6, 3, -1},
{-1, 3, -6, 11, -21, 60, 99, -25, 12, -6, 3, -1},
{-1, 2, -5, 9, -18, 49, 107, -23, 11, -5, 3, -1},
{-1, 2, -4, 8, -15, 38, 114, -21, 10, -4, 2, -1},
{-1, 1, -3, 6, -11, 28, 120, -17, 8, -4, 2, -1},
{0, 1, -2, 4, -8, 18, 124, -12, 5, -3, 1, 0},
{0, 0, -1, 2, -4, 8, 127, -7, 3, -1, 1, 0},
};
#else
DECLARE_ALIGNED(256, static const InterpKernel,
@ -201,7 +200,6 @@ DECLARE_ALIGNED(256, static const InterpKernel,
{ 0, -3, 2, 41, 63, 29, -2, -2},
{ 0, -3, 1, 38, 64, 32, -1, -3}
};
#endif // CONFIG_EXT_INTERP
const InterpKernel *vp10_filter_kernels[SWITCHABLE_FILTERS + 1] = {
@ -240,7 +238,17 @@ vp10_interp_filter_params_list[SWITCHABLE_FILTERS + 1] = {
{(const int16_t*)bilinear_filters, SUBPEL_TAPS, SUBPEL_SHIFTS}
};
#if FILTER_12TAP
static const InterpFilterParams vp10_interp_filter_12tap = {
(const int16_t*)sub_pel_filters_12sharp, 12, SUBPEL_SHIFTS
};
#endif
InterpFilterParams vp10_get_interp_filter_params(
const INTERP_FILTER interp_filter) {
#if FILTER_12TAP
if (interp_filter == SHARP_FILTER_12TAP)
return vp10_interp_filter_12tap;
#endif
return vp10_interp_filter_params_list[interp_filter];
}

7
vp10/common/filter.h
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@ -43,6 +43,13 @@ extern "C" {
#else
#define SWITCHABLE_FILTERS 3 /* Number of switchable filters */
#endif // CONFIG_EXT_INTERP
// TODO(jingning): Align the experiment flags and clean this up.
#define FILTER_12TAP (!CONFIG_EXT_INTERP)
#if FILTER_12TAP
#define SHARP_FILTER_12TAP (SWITCHABLE_FILTERS + 1)
#endif
// The codec can operate in four possible inter prediction filter mode:
// 8-tap, 8-tap-smooth, 8-tap-sharp, and switching between the three.

10
vp10/encoder/temporal_filter.c
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@ -45,10 +45,16 @@ static void temporal_filter_predictors_mb_c(MACROBLOCKD *xd,
int x, int y) {
const int which_mv = 0;
const MV mv = { mv_row, mv_col };
const INTERP_FILTER interp_filter = xd->mi[0]->mbmi.interp_filter;
enum mv_precision mv_precision_uv;
int uv_stride;
#if FILTER_12TAP
const INTERP_FILTER interp_filter = SHARP_FILTER_12TAP;
(void)xd;
#else
const INTERP_FILTER interp_filter = xd->mi[0]->mbmi.interp_filter;
#endif
if (uv_block_width == 8) {
uv_stride = (stride + 1) >> 1;
mv_precision_uv = MV_PRECISION_Q4;