113 lines
4.3 KiB
C
113 lines
4.3 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef __INC_ENTROPY_H
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#define __INC_ENTROPY_H
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#include "treecoder.h"
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#include "blockd.h"
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#include "common.h"
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#include "coefupdateprobs.h"
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extern const int vp9_i8x8_block[4];
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/* Coefficient token alphabet */
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#define ZERO_TOKEN 0 /* 0 Extra Bits 0+0 */
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#define ONE_TOKEN 1 /* 1 Extra Bits 0+1 */
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#define TWO_TOKEN 2 /* 2 Extra Bits 0+1 */
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#define THREE_TOKEN 3 /* 3 Extra Bits 0+1 */
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#define FOUR_TOKEN 4 /* 4 Extra Bits 0+1 */
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#define DCT_VAL_CATEGORY1 5 /* 5-6 Extra Bits 1+1 */
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#define DCT_VAL_CATEGORY2 6 /* 7-10 Extra Bits 2+1 */
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#define DCT_VAL_CATEGORY3 7 /* 11-18 Extra Bits 3+1 */
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#define DCT_VAL_CATEGORY4 8 /* 19-34 Extra Bits 4+1 */
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#define DCT_VAL_CATEGORY5 9 /* 35-66 Extra Bits 5+1 */
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#define DCT_VAL_CATEGORY6 10 /* 67+ Extra Bits 13+1 */
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#define DCT_EOB_TOKEN 11 /* EOB Extra Bits 0+0 */
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#define MAX_ENTROPY_TOKENS 12
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#define ENTROPY_NODES 11
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#define EOSB_TOKEN 127 /* Not signalled, encoder only */
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extern const vp9_tree_index vp9_coef_tree[];
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extern struct vp9_token_struct vp9_coef_encodings[MAX_ENTROPY_TOKENS];
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typedef struct {
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vp9_tree_p tree;
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const vp9_prob *prob;
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int Len;
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int base_val;
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} vp9_extra_bit_struct;
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extern vp9_extra_bit_struct vp9_extra_bits[12]; /* indexed by token value */
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#define PROB_UPDATE_BASELINE_COST 7
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#define MAX_PROB 255
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#define DCT_MAX_VALUE 8192
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/* Coefficients are predicted via a 3-dimensional probability table. */
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/* Outside dimension. 0 = Y no DC, 1 = Y2, 2 = UV, 3 = Y with DC */
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#define BLOCK_TYPES 4
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#define BLOCK_TYPES_8X8 4
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#define BLOCK_TYPES_16X16 4
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/* Middle dimension is a coarsening of the coefficient's
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position within the 4x4 DCT. */
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#define COEF_BANDS 8
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extern DECLARE_ALIGNED(16, const int, vp9_coef_bands[16]);
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extern DECLARE_ALIGNED(64, const int, vp9_coef_bands_8x8[64]);
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extern DECLARE_ALIGNED(16, const int, vp9_coef_bands_16x16[256]);
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/* Inside dimension is 3-valued measure of nearby complexity, that is,
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the extent to which nearby coefficients are nonzero. For the first
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coefficient (DC, unless block type is 0), we look at the (already encoded)
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blocks above and to the left of the current block. The context index is
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then the number (0,1,or 2) of these blocks having nonzero coefficients.
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After decoding a coefficient, the measure is roughly the size of the
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most recently decoded coefficient (0 for 0, 1 for 1, 2 for >1).
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Note that the intuitive meaning of this measure changes as coefficients
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are decoded, e.g., prior to the first token, a zero means that my neighbors
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are empty while, after the first token, because of the use of end-of-block,
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a zero means we just decoded a zero and hence guarantees that a non-zero
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coefficient will appear later in this block. However, this shift
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in meaning is perfectly OK because our context depends also on the
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coefficient band (and since zigzag positions 0, 1, and 2 are in
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distinct bands). */
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/*# define DC_TOKEN_CONTEXTS 3*/ /* 00, 0!0, !0!0 */
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#define PREV_COEF_CONTEXTS 4
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#define SUBEXP_PARAM 4 /* Subexponential code parameter */
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#define MODULUS_PARAM 13 /* Modulus parameter */
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extern DECLARE_ALIGNED(16, const unsigned char, vp9_prev_token_class[MAX_ENTROPY_TOKENS]);
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struct VP9Common;
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void vp9_default_coef_probs(struct VP9Common *);
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extern DECLARE_ALIGNED(16, const int, vp9_default_zig_zag1d[16]);
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extern DECLARE_ALIGNED(16, const int, vp9_col_scan[16]);
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extern DECLARE_ALIGNED(16, const int, vp9_row_scan[16]);
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extern DECLARE_ALIGNED(64, const int, vp9_default_zig_zag1d_8x8[64]);
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void vp9_coef_tree_initialize(void);
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extern DECLARE_ALIGNED(16, const int, vp9_default_zig_zag1d_16x16[256]);
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void vp9_adapt_coef_probs(struct VP9Common *);
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#endif
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