mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-29 15:17:11 +01:00
110 lines
4.0 KiB
C++
110 lines
4.0 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 VP8_COMMON_ENTROPY_H_
|
|
#define VP8_COMMON_ENTROPY_H_
|
|
|
|
#include "treecoder.h"
|
|
#include "blockd.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* 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 11+1 */
|
|
#define DCT_EOB_TOKEN 11 /* EOB Extra Bits 0+0 */
|
|
|
|
#define MAX_ENTROPY_TOKENS 12
|
|
#define ENTROPY_NODES 11
|
|
|
|
extern const vp8_tree_index vp8_coef_tree[];
|
|
|
|
extern const struct vp8_token_struct vp8_coef_encodings[MAX_ENTROPY_TOKENS];
|
|
|
|
typedef struct
|
|
{
|
|
vp8_tree_p tree;
|
|
const vp8_prob *prob;
|
|
int Len;
|
|
int base_val;
|
|
} vp8_extra_bit_struct;
|
|
|
|
extern const vp8_extra_bit_struct vp8_extra_bits[12]; /* indexed by token value */
|
|
|
|
#define PROB_UPDATE_BASELINE_COST 7
|
|
|
|
#define MAX_PROB 255
|
|
#define DCT_MAX_VALUE 2048
|
|
|
|
|
|
/* Coefficients are predicted via a 3-dimensional probability table. */
|
|
|
|
/* Outside dimension. 0 = Y no DC, 1 = Y2, 2 = UV, 3 = Y with DC */
|
|
|
|
#define BLOCK_TYPES 4
|
|
|
|
/* Middle dimension is a coarsening of the coefficient's
|
|
position within the 4x4 DCT. */
|
|
|
|
#define COEF_BANDS 8
|
|
extern DECLARE_ALIGNED(16, const unsigned char, vp8_coef_bands[16]);
|
|
|
|
/* Inside dimension is 3-valued measure of nearby complexity, that is,
|
|
the extent to which 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 roughly the size of the
|
|
most recently decoded coefficient (0 for 0, 1 for 1, 2 for >1).
|
|
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 3
|
|
|
|
extern DECLARE_ALIGNED(16, const unsigned char, vp8_prev_token_class[MAX_ENTROPY_TOKENS]);
|
|
|
|
extern const vp8_prob vp8_coef_update_probs [BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [ENTROPY_NODES];
|
|
|
|
|
|
struct VP8Common;
|
|
void vp8_default_coef_probs(struct VP8Common *);
|
|
|
|
extern DECLARE_ALIGNED(16, const int, vp8_default_zig_zag1d[16]);
|
|
extern DECLARE_ALIGNED(16, const short, vp8_default_inv_zig_zag[16]);
|
|
extern DECLARE_ALIGNED(16, const short, vp8_default_zig_zag_mask[16]);
|
|
extern const int vp8_mb_feature_data_bits[MB_LVL_MAX];
|
|
|
|
void vp8_coef_tree_initialize(void);
|
|
#ifdef __cplusplus
|
|
} // extern "C"
|
|
#endif
|
|
|
|
#endif // VP8_COMMON_ENTROPY_H_
|