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/*
* Copyright (c) 2021, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 3-Clause Clear License
* and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
* License was not distributed with this source code in the LICENSE file, you
* can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. 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
* aomedia.org/license/patent-license/.
*/
#ifndef AOM_AV1_COMMON_ENTROPY_H_
#define AOM_AV1_COMMON_ENTROPY_H_
#include "config/aom_config.h"
#include "aom/aom_integer.h"
#include "aom_dsp/prob.h"
#include "av1/common/common.h"
#include "av1/common/common_data.h"
#include "av1/common/enums.h"
#ifdef __cplusplus
extern "C" {
#endif
#define TOKEN_CDF_Q_CTXS 4
#if CONFIG_CONTEXT_DERIVATION
#define CROSS_COMPONENT_CONTEXTS 3
#define V_TXB_SKIP_CONTEXTS 12
#define V_TXB_SKIP_CONTEXT_OFFSET 6
#endif // CONFIG_CONTEXT_DERIVATION
#define TXB_SKIP_CONTEXTS 20
#define IDTX_SIGN_CONTEXTS 9
#define IDTX_SIG_COEF_CONTEXTS 14
#define IDTX_LEVEL_CONTEXTS 14
#define EOB_COEF_CONTEXTS 9
#define SIG_COEF_CONTEXTS_BOB 3
#define EOB_MAX_SYMS 11
#define COEFF_BASE_PH_CONTEXTS 5
#define COEFF_BR_PH_CONTEXTS 7
// Number of coefficient coding contexts for the low-frequency region
// for 2D and 1D transforms
#define LF_SIG_COEF_CONTEXTS_2D 21
#define LF_SIG_COEF_CONTEXTS_1D 12
#define LF_SIG_COEF_CONTEXTS (LF_SIG_COEF_CONTEXTS_2D + LF_SIG_COEF_CONTEXTS_1D)
#define LF_LEVEL_CONTEXTS 14 // low-range contexts
// Number of coefficient coding contexts for the higher-frequency default region
// for 2D and 1D transforms
#define SIG_COEF_CONTEXTS_2D 20
#define SIG_COEF_CONTEXTS SIG_COEF_CONTEXTS_2D // base range contexts
#define LEVEL_CONTEXTS 7 // low range contexts
#define SIG_COEF_CONTEXTS_EOB 4 // context count for the EOB coefficient
// Number of symbols for base range coding in low-frequency region
#define LF_BASE_SYMBOLS 6
#define LF_NUM_BASE_LEVELS (LF_BASE_SYMBOLS - 2)
#define LF_MAX_BASE_BR_RANGE (COEFF_BASE_RANGE + LF_NUM_BASE_LEVELS + 1)
// Limits to determine the low-frequency region for coefficient coding.
#define LF_2D_LIM 4 // row + column limit
#define LF_2D_LIM_UV 1 // row + column limit for chroma
#define LF_RC_LIM 2 // row or column limit
#define LF_RC_LIM_UV 1 // row or column limit for chroma
#define COEFF_BASE_CONTEXTS (SIG_COEF_CONTEXTS)
#define DC_SIGN_CONTEXTS 3
#define BR_TMP_OFFSET 12
#define BR_REF_CAT 4
#define NUM_BASE_LEVELS 2
#define BR_CDF_SIZE (4)
#define COEFF_BASE_RANGE (4 * (BR_CDF_SIZE - 1))
#define COEFF_CONTEXT_BITS 3
#define COEFF_CONTEXT_MASK ((1 << COEFF_CONTEXT_BITS) - 1)
#define MAX_BASE_BR_RANGE (COEFF_BASE_RANGE + NUM_BASE_LEVELS + 1)
#define BASE_CONTEXT_POSITION_NUM 12
enum {
TX_CLASS_2D = 0,
TX_CLASS_HORIZ = 1,
TX_CLASS_VERT = 2,
TX_CLASSES = 3,
} UENUM1BYTE(TX_CLASS);
#define DCT_MAX_VALUE 16384
#define DCT_MAX_VALUE_HIGH10 65536
#define DCT_MAX_VALUE_HIGH12 262144
/* Coefficients are predicted via a 3-dimensional probability table indexed on
* REF_TYPES, COEF_BANDS and COEF_CONTEXTS. */
#define REF_TYPES 2 // intra=0, inter=1
struct AV1Common;
struct frame_contexts;
void av1_reset_cdf_symbol_counters(struct frame_contexts *fc);
void av1_default_coef_probs(struct AV1Common *cm);
struct frame_contexts;
typedef char ENTROPY_CONTEXT;
static INLINE int combine_entropy_contexts(ENTROPY_CONTEXT a,
ENTROPY_CONTEXT b) {
return (a != 0) + (b != 0);
}
static INLINE ENTROPY_CONTEXT get_entropy_context_1d(const ENTROPY_CONTEXT *ctx,
int size) {
switch (size) {
case 4: return ctx[0] != 0;
case 8:
#if CONFIG_EXT_RECUR_PARTITIONS
return ctx[0] != 0 || ctx[1] != 0;
#else
return !!*(const uint16_t *)ctx;
#endif // CONFIG_EXT_RECUR_PARTITIONS
case 16:
#if CONFIG_EXT_RECUR_PARTITIONS
return ctx[0] != 0 || ctx[1] != 0 || ctx[2] != 0 || ctx[3] != 0;
#else
return !!*(const uint32_t *)ctx;
#endif // CONFIG_EXT_RECUR_PARTITIONS
case 32:
#if CONFIG_EXT_RECUR_PARTITIONS
return !!(*(const uint16_t *)ctx | *(const uint16_t *)(ctx + 2) |
*(const uint16_t *)(ctx + 4) | *(const uint16_t *)(ctx + 6));
#else
return !!*(const uint64_t *)ctx;
#endif // CONFIG_EXT_RECUR_PARTITIONS
case 64: return !!(*(const uint64_t *)ctx | *(const uint64_t *)(ctx + 8));
default: assert(0 && "Invalid transform 1d size."); break;
}
return 0;
}
static INLINE int get_entropy_context(TX_SIZE tx_size, const ENTROPY_CONTEXT *a,
const ENTROPY_CONTEXT *l) {
assert(tx_size < TX_SIZES_ALL);
const int txw = tx_size_wide[tx_size];
const int txh = tx_size_high[tx_size];
ENTROPY_CONTEXT above_ec = 0, left_ec = 0;
above_ec = get_entropy_context_1d(a, txw);
left_ec = get_entropy_context_1d(l, txh);
return combine_entropy_contexts(above_ec, left_ec);
}
static INLINE TX_SIZE get_txsize_entropy_ctx(TX_SIZE txsize) {
return (TX_SIZE)((txsize_sqr_map[txsize] + txsize_sqr_up_map[txsize] + 1) >>
1);
}
#if CONFIG_EOB_POS_LUMA
#define EOB_PLANE_CTXS 3
static INLINE int get_eob_plane_ctx(int plane, int is_inter) {
return plane ? 2 : is_inter;
}
#endif // CONFIG_EOB_POS_LUMA
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AOM_AV1_COMMON_ENTROPY_H_