135 lines
5.2 KiB
C
135 lines
5.2 KiB
C
/*
|
|
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#ifndef VP9_COMMON_VP9_ENTROPY_H_
|
|
#define VP9_COMMON_VP9_ENTROPY_H_
|
|
|
|
#include "vpx/vpx_integer.h"
|
|
#include "vp9/common/vp9_treecoder.h"
|
|
#include "vp9/common/vp9_blockd.h"
|
|
#include "vp9/common/vp9_common.h"
|
|
#include "vp9/common/vp9_coefupdateprobs.h"
|
|
|
|
extern const int vp9_i8x8_block[4];
|
|
|
|
/* Coefficient token alphabet */
|
|
|
|
#define ZERO_TOKEN 0 /* 0 Extra Bits 0+0 */
|
|
#define ONE_TOKEN 1 /* 1 Extra Bits 0+1 */
|
|
#define TWO_TOKEN 2 /* 2 Extra Bits 0+1 */
|
|
#define THREE_TOKEN 3 /* 3 Extra Bits 0+1 */
|
|
#define FOUR_TOKEN 4 /* 4 Extra Bits 0+1 */
|
|
#define DCT_VAL_CATEGORY1 5 /* 5-6 Extra Bits 1+1 */
|
|
#define DCT_VAL_CATEGORY2 6 /* 7-10 Extra Bits 2+1 */
|
|
#define DCT_VAL_CATEGORY3 7 /* 11-18 Extra Bits 3+1 */
|
|
#define DCT_VAL_CATEGORY4 8 /* 19-34 Extra Bits 4+1 */
|
|
#define DCT_VAL_CATEGORY5 9 /* 35-66 Extra Bits 5+1 */
|
|
#define DCT_VAL_CATEGORY6 10 /* 67+ Extra Bits 13+1 */
|
|
#define DCT_EOB_TOKEN 11 /* EOB Extra Bits 0+0 */
|
|
#define MAX_ENTROPY_TOKENS 12
|
|
#define ENTROPY_NODES 11
|
|
#define EOSB_TOKEN 127 /* Not signalled, encoder only */
|
|
|
|
#define INTER_MODE_CONTEXTS 7
|
|
|
|
extern const vp9_tree_index vp9_coef_tree[];
|
|
|
|
extern struct vp9_token_struct vp9_coef_encodings[MAX_ENTROPY_TOKENS];
|
|
|
|
typedef struct {
|
|
vp9_tree_p tree;
|
|
const vp9_prob *prob;
|
|
int Len;
|
|
int base_val;
|
|
} vp9_extra_bit_struct;
|
|
|
|
extern vp9_extra_bit_struct vp9_extra_bits[12]; /* indexed by token value */
|
|
|
|
#define PROB_UPDATE_BASELINE_COST 7
|
|
|
|
#define MAX_PROB 255
|
|
#define DCT_MAX_VALUE 16384
|
|
|
|
/* Coefficients are predicted via a 3-dimensional probability table. */
|
|
|
|
/* Outside dimension. 0 = Y with DC, 1 = UV */
|
|
#define BLOCK_TYPES 2
|
|
#define BLOCK_TYPES_32X32 1
|
|
#define REF_TYPES 2 // intra=0, inter=1
|
|
|
|
/* Middle dimension reflects the coefficient position within the transform. */
|
|
#define COEF_BANDS 6
|
|
|
|
/* Inside dimension is measure of nearby complexity, that reflects the energy
|
|
of nearby coefficients are nonzero. For the first coefficient (DC, unless
|
|
block type is 0), we look at the (already encoded) blocks above and to the
|
|
left of the current block. The context index is then the number (0,1,or 2)
|
|
of these blocks having nonzero coefficients.
|
|
After decoding a coefficient, the measure is determined by the size of the
|
|
most recently decoded coefficient.
|
|
Note that the intuitive meaning of this measure changes as coefficients
|
|
are decoded, e.g., prior to the first token, a zero means that my neighbors
|
|
are empty while, after the first token, because of the use of end-of-block,
|
|
a zero means we just decoded a zero and hence guarantees that a non-zero
|
|
coefficient will appear later in this block. However, this shift
|
|
in meaning is perfectly OK because our context depends also on the
|
|
coefficient band (and since zigzag positions 0, 1, and 2 are in
|
|
distinct bands). */
|
|
|
|
/*# define DC_TOKEN_CONTEXTS 3*/ /* 00, 0!0, !0!0 */
|
|
#define PREV_COEF_CONTEXTS 6
|
|
|
|
typedef unsigned int vp9_coeff_count[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
|
|
[MAX_ENTROPY_TOKENS];
|
|
typedef unsigned int vp9_coeff_stats[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
|
|
[ENTROPY_NODES][2];
|
|
typedef vp9_prob vp9_coeff_probs[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
|
|
[ENTROPY_NODES];
|
|
|
|
#define SUBEXP_PARAM 4 /* Subexponential code parameter */
|
|
#define MODULUS_PARAM 13 /* Modulus parameter */
|
|
|
|
struct VP9Common;
|
|
void vp9_default_coef_probs(struct VP9Common *);
|
|
extern DECLARE_ALIGNED(16, const int, vp9_default_zig_zag1d_4x4[16]);
|
|
|
|
extern DECLARE_ALIGNED(16, const int, vp9_col_scan_4x4[16]);
|
|
extern DECLARE_ALIGNED(16, const int, vp9_row_scan_4x4[16]);
|
|
|
|
extern DECLARE_ALIGNED(64, const int, vp9_default_zig_zag1d_8x8[64]);
|
|
extern DECLARE_ALIGNED(16, const int, vp9_default_zig_zag1d_16x16[256]);
|
|
extern DECLARE_ALIGNED(16, const int, vp9_default_zig_zag1d_32x32[1024]);
|
|
|
|
void vp9_coef_tree_initialize(void);
|
|
void vp9_adapt_coef_probs(struct VP9Common *);
|
|
|
|
static void vp9_reset_mb_tokens_context(MACROBLOCKD* const xd) {
|
|
/* Clear entropy contexts */
|
|
vpx_memset(xd->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
|
|
vpx_memset(xd->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
|
|
}
|
|
|
|
extern const int vp9_coef_bands[32];
|
|
extern const int vp9_coef_bands4x4[16];
|
|
|
|
static int get_coef_band(TX_SIZE tx_size, int coef_index) {
|
|
if (tx_size == TX_4X4) {
|
|
return vp9_coef_bands4x4[coef_index];
|
|
} else {
|
|
if (coef_index < 32)
|
|
return vp9_coef_bands[coef_index];
|
|
else
|
|
return 5;
|
|
}
|
|
}
|
|
extern int vp9_get_coef_context(int * recent_energy, int token);
|
|
|
|
#endif // VP9_COMMON_VP9_ENTROPY_H_
|