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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 AV1_COMMON_FILTER_H_
#define 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;
// With CONFIG_DUAL_FILTER, 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.
//
// Without CONFIG_DUAL_FILTER,
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;
}
#define LOG_SWITCHABLE_FILTERS \
2 /* (1 << LOG_SWITCHABLE_FILTERS) > SWITCHABLE_FILTERS */
#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;
const int16_t *av1_get_interp_filter_kernel(const InterpFilter interp_filter);
InterpFilterParams av1_get_interp_filter_params_with_block_size(
const InterpFilter interp_filter, const int w);
static INLINE const int16_t *av1_get_interp_filter_subpel_kernel(
const InterpFilterParams filter_params, const int subpel) {
return filter_params.filter_ptr + filter_params.taps * subpel;
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AV1_COMMON_FILTER_H_
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