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/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#ifndef AOM_AV1_COMMON_FILTER_H_
#define AOM_AV1_COMMON_FILTER_H_
#include <assert.h>
#include "config/aom_config.h"
#include "aom/aom_integer.h"
#include "aom_dsp/aom_filter.h"
#include "aom_ports/mem.h"
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_FILTER_TAP 8
typedef enum ATTRIBUTE_PACKED {
EIGHTTAP_REGULAR,
EIGHTTAP_SMOOTH,
MULTITAP_SHARP,
BILINEAR,
INTERP_FILTERS_ALL,
SWITCHABLE_FILTERS = BILINEAR,
SWITCHABLE = SWITCHABLE_FILTERS + 1, /* the last switchable one */
EXTRA_FILTERS = INTERP_FILTERS_ALL - SWITCHABLE_FILTERS,
} InterpFilter;
typedef enum {
USE_2_TAPS_ORIG = 0, // This is used in temporal filtering.
USE_2_TAPS,
USE_4_TAPS,
USE_8_TAPS,
} SUBPEL_SEARCH_TYPE;
// Pack two InterpFilter's into a uint32_t: since there are at most 10 filters,
// we can use 16 bits for each and have more than enough space. This reduces
// argument passing and unifies the operation of setting a (pair of) filters.
typedef uint32_t InterpFilters;
static INLINE InterpFilter av1_extract_interp_filter(InterpFilters filters,
int x_filter) {
return (InterpFilter)((filters >> (x_filter ? 16 : 0)) & 0xf);
}
static INLINE InterpFilters av1_make_interp_filters(InterpFilter y_filter,
InterpFilter x_filter) {
uint16_t y16 = y_filter & 0xf;
uint16_t x16 = x_filter & 0xf;
return y16 | ((uint32_t)x16 << 16);
}
static INLINE InterpFilters av1_broadcast_interp_filter(InterpFilter filter) {
return av1_make_interp_filters(filter, filter);
}
static INLINE InterpFilter av1_unswitchable_filter(InterpFilter filter) {
return filter == SWITCHABLE ? EIGHTTAP_REGULAR : filter;
}
/* (1 << LOG_SWITCHABLE_FILTERS) > SWITCHABLE_FILTERS */
#define LOG_SWITCHABLE_FILTERS 2
#define MAX_SUBPEL_TAPS 12
#define SWITCHABLE_FILTER_CONTEXTS ((SWITCHABLE_FILTERS + 1) * 4)
#define INTER_FILTER_COMP_OFFSET (SWITCHABLE_FILTERS + 1)
#define INTER_FILTER_DIR_OFFSET ((SWITCHABLE_FILTERS + 1) * 2)
typedef struct InterpFilterParams {
const int16_t *filter_ptr;
uint16_t taps;
uint16_t subpel_shifts;
InterpFilter interp_filter;
} InterpFilterParams;
DECLARE_ALIGNED(256, static const InterpKernel,
av1_bilinear_filters[SUBPEL_SHIFTS]) = {
{ 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 0, 0, 120, 8, 0, 0, 0 },
{ 0, 0, 0, 112, 16, 0, 0, 0 }, { 0, 0, 0, 104, 24, 0, 0, 0 },
{ 0, 0, 0, 96, 32, 0, 0, 0 }, { 0, 0, 0, 88, 40, 0, 0, 0 },
{ 0, 0, 0, 80, 48, 0, 0, 0 }, { 0, 0, 0, 72, 56, 0, 0, 0 },
{ 0, 0, 0, 64, 64, 0, 0, 0 }, { 0, 0, 0, 56, 72, 0, 0, 0 },
{ 0, 0, 0, 48, 80, 0, 0, 0 }, { 0, 0, 0, 40, 88, 0, 0, 0 },
{ 0, 0, 0, 32, 96, 0, 0, 0 }, { 0, 0, 0, 24, 104, 0, 0, 0 },
{ 0, 0, 0, 16, 112, 0, 0, 0 }, { 0, 0, 0, 8, 120, 0, 0, 0 }
};
DECLARE_ALIGNED(256, static const InterpKernel,
av1_sub_pel_filters_8[SUBPEL_SHIFTS]) = {
{ 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 2, -6, 126, 8, -2, 0, 0 },
{ 0, 2, -10, 122, 18, -4, 0, 0 }, { 0, 2, -12, 116, 28, -8, 2, 0 },
{ 0, 2, -14, 110, 38, -10, 2, 0 }, { 0, 2, -14, 102, 48, -12, 2, 0 },
{ 0, 2, -16, 94, 58, -12, 2, 0 }, { 0, 2, -14, 84, 66, -12, 2, 0 },
{ 0, 2, -14, 76, 76, -14, 2, 0 }, { 0, 2, -12, 66, 84, -14, 2, 0 },
{ 0, 2, -12, 58, 94, -16, 2, 0 }, { 0, 2, -12, 48, 102, -14, 2, 0 },
{ 0, 2, -10, 38, 110, -14, 2, 0 }, { 0, 2, -8, 28, 116, -12, 2, 0 },
{ 0, 0, -4, 18, 122, -10, 2, 0 }, { 0, 0, -2, 8, 126, -6, 2, 0 }
};
DECLARE_ALIGNED(256, static const InterpKernel,
av1_sub_pel_filters_8sharp[SUBPEL_SHIFTS]) = {
{ 0, 0, 0, 128, 0, 0, 0, 0 }, { -2, 2, -6, 126, 8, -2, 2, 0 },
{ -2, 6, -12, 124, 16, -6, 4, -2 }, { -2, 8, -18, 120, 26, -10, 6, -2 },
{ -4, 10, -22, 116, 38, -14, 6, -2 }, { -4, 10, -22, 108, 48, -18, 8, -2 },
{ -4, 10, -24, 100, 60, -20, 8, -2 }, { -4, 10, -24, 90, 70, -22, 10, -2 },
{ -4, 12, -24, 80, 80, -24, 12, -4 }, { -2, 10, -22, 70, 90, -24, 10, -4 },
{ -2, 8, -20, 60, 100, -24, 10, -4 }, { -2, 8, -18, 48, 108, -22, 10, -4 },
{ -2, 6, -14, 38, 116, -22, 10, -4 }, { -2, 6, -10, 26, 120, -18, 8, -2 },
{ -2, 4, -6, 16, 124, -12, 6, -2 }, { 0, 2, -2, 8, 126, -6, 2, -2 }
};
DECLARE_ALIGNED(256, static const InterpKernel,
av1_sub_pel_filters_8smooth[SUBPEL_SHIFTS]) = {
{ 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 2, 28, 62, 34, 2, 0, 0 },
{ 0, 0, 26, 62, 36, 4, 0, 0 }, { 0, 0, 22, 62, 40, 4, 0, 0 },
{ 0, 0, 20, 60, 42, 6, 0, 0 }, { 0, 0, 18, 58, 44, 8, 0, 0 },
{ 0, 0, 16, 56, 46, 10, 0, 0 }, { 0, -2, 16, 54, 48, 12, 0, 0 },
{ 0, -2, 14, 52, 52, 14, -2, 0 }, { 0, 0, 12, 48, 54, 16, -2, 0 },
{ 0, 0, 10, 46, 56, 16, 0, 0 }, { 0, 0, 8, 44, 58, 18, 0, 0 },
{ 0, 0, 6, 42, 60, 20, 0, 0 }, { 0, 0, 4, 40, 62, 22, 0, 0 },
{ 0, 0, 4, 36, 62, 26, 0, 0 }, { 0, 0, 2, 34, 62, 28, 2, 0 }
};
static const InterpFilterParams
av1_interp_filter_params_list[SWITCHABLE_FILTERS + 1] = {
{ (const int16_t *)av1_sub_pel_filters_8, SUBPEL_TAPS, SUBPEL_SHIFTS,
EIGHTTAP_REGULAR },
{ (const int16_t *)av1_sub_pel_filters_8smooth, SUBPEL_TAPS,
SUBPEL_SHIFTS, EIGHTTAP_SMOOTH },
{ (const int16_t *)av1_sub_pel_filters_8sharp, SUBPEL_TAPS, SUBPEL_SHIFTS,
MULTITAP_SHARP },
{ (const int16_t *)av1_bilinear_filters, SUBPEL_TAPS, SUBPEL_SHIFTS,
BILINEAR }
};
// A special 2-tap bilinear filter for IntraBC chroma. IntraBC uses full pixel
// MV for luma. If sub-sampling exists, chroma may possibly use half-pel MV.
DECLARE_ALIGNED(256, static const int16_t, av1_intrabc_bilinear_filter[2]) = {
64,
64,
};
static const InterpFilterParams av1_intrabc_filter_params = {
av1_intrabc_bilinear_filter, 2, 0, BILINEAR
};
DECLARE_ALIGNED(256, static const InterpKernel,
av1_sub_pel_filters_4[SUBPEL_SHIFTS]) = {
{ 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 0, -4, 126, 8, -2, 0, 0 },
{ 0, 0, -8, 122, 18, -4, 0, 0 }, { 0, 0, -10, 116, 28, -6, 0, 0 },
{ 0, 0, -12, 110, 38, -8, 0, 0 }, { 0, 0, -12, 102, 48, -10, 0, 0 },
{ 0, 0, -14, 94, 58, -10, 0, 0 }, { 0, 0, -12, 84, 66, -10, 0, 0 },
{ 0, 0, -12, 76, 76, -12, 0, 0 }, { 0, 0, -10, 66, 84, -12, 0, 0 },
{ 0, 0, -10, 58, 94, -14, 0, 0 }, { 0, 0, -10, 48, 102, -12, 0, 0 },
{ 0, 0, -8, 38, 110, -12, 0, 0 }, { 0, 0, -6, 28, 116, -10, 0, 0 },
{ 0, 0, -4, 18, 122, -8, 0, 0 }, { 0, 0, -2, 8, 126, -4, 0, 0 }
};
DECLARE_ALIGNED(256, static const InterpKernel,
av1_sub_pel_filters_4smooth[SUBPEL_SHIFTS]) = {
{ 0, 0, 0, 128, 0, 0, 0, 0 }, { 0, 0, 30, 62, 34, 2, 0, 0 },
{ 0, 0, 26, 62, 36, 4, 0, 0 }, { 0, 0, 22, 62, 40, 4, 0, 0 },
{ 0, 0, 20, 60, 42, 6, 0, 0 }, { 0, 0, 18, 58, 44, 8, 0, 0 },
{ 0, 0, 16, 56, 46, 10, 0, 0 }, { 0, 0, 14, 54, 48, 12, 0, 0 },
{ 0, 0, 12, 52, 52, 12, 0, 0 }, { 0, 0, 12, 48, 54, 14, 0, 0 },
{ 0, 0, 10, 46, 56, 16, 0, 0 }, { 0, 0, 8, 44, 58, 18, 0, 0 },
{ 0, 0, 6, 42, 60, 20, 0, 0 }, { 0, 0, 4, 40, 62, 22, 0, 0 },
{ 0, 0, 4, 36, 62, 26, 0, 0 }, { 0, 0, 2, 34, 62, 30, 0, 0 }
};
// For w<=4, MULTITAP_SHARP is the same as EIGHTTAP_REGULAR
static const InterpFilterParams av1_interp_4tap[SWITCHABLE_FILTERS + 1] = {
{ (const int16_t *)av1_sub_pel_filters_4, SUBPEL_TAPS, SUBPEL_SHIFTS,
EIGHTTAP_REGULAR },
{ (const int16_t *)av1_sub_pel_filters_4smooth, SUBPEL_TAPS, SUBPEL_SHIFTS,
EIGHTTAP_SMOOTH },
{ (const int16_t *)av1_sub_pel_filters_4, SUBPEL_TAPS, SUBPEL_SHIFTS,
EIGHTTAP_REGULAR },
{ (const int16_t *)av1_bilinear_filters, SUBPEL_TAPS, SUBPEL_SHIFTS,
BILINEAR },
};
static INLINE const InterpFilterParams *
av1_get_interp_filter_params_with_block_size(const InterpFilter interp_filter,
const int w) {
if (w <= 4) return &av1_interp_4tap[interp_filter];
return &av1_interp_filter_params_list[interp_filter];
}
static INLINE const InterpFilterParams *get_4tap_interp_filter_params(
const InterpFilter interp_filter) {
return &av1_interp_4tap[interp_filter];
}
static INLINE const int16_t *av1_get_interp_filter_kernel(
const InterpFilter interp_filter, int subpel_search) {
assert(subpel_search >= USE_2_TAPS);
return (subpel_search == USE_2_TAPS)
? av1_interp_4tap[BILINEAR].filter_ptr
: ((subpel_search == USE_4_TAPS)
? av1_interp_4tap[interp_filter].filter_ptr
: av1_interp_filter_params_list[interp_filter].filter_ptr);
}
static INLINE const int16_t *av1_get_interp_filter_subpel_kernel(
const InterpFilterParams *const filter_params, const int subpel) {
return filter_params->filter_ptr + filter_params->taps * subpel;
}
static INLINE const InterpFilterParams *av1_get_filter(int subpel_search) {
assert(subpel_search >= USE_2_TAPS);
switch (subpel_search) {
case USE_2_TAPS: return get_4tap_interp_filter_params(BILINEAR);
case USE_4_TAPS: return get_4tap_interp_filter_params(EIGHTTAP_REGULAR);
case USE_8_TAPS: return &av1_interp_filter_params_list[EIGHTTAP_REGULAR];
default: assert(0); return NULL;
}
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AOM_AV1_COMMON_FILTER_H_
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