ref: 7ec916e8183332df6f1bd94b58f344f9923833b7
dir: /vp8/common/entropy.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.
*/
#include "entropy.h"
#include "blockd.h"
#include "onyxc_int.h"
#include "vpx_mem/vpx_mem.h"
#include "coefupdateprobs.h"
DECLARE_ALIGNED(16, const unsigned char, vp8_norm[256]) = {
0, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
DECLARE_ALIGNED(16, const unsigned char,
vp8_coef_bands[16]) = { 0, 1, 2, 3, 6, 4, 5, 6,
6, 6, 6, 6, 6, 6, 6, 7 };
DECLARE_ALIGNED(16, const unsigned char,
vp8_prev_token_class[MAX_ENTROPY_TOKENS]) = {
0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0
};
DECLARE_ALIGNED(16, const int, vp8_default_zig_zag1d[16]) = {
0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15,
};
DECLARE_ALIGNED(16, const short,
vp8_default_inv_zig_zag[16]) = { 1, 2, 6, 7, 3, 5, 8, 13,
4, 9, 12, 14, 10, 11, 15, 16 };
/* vp8_default_zig_zag_mask generated with:
void vp8_init_scan_order_mask()
{
int i;
for (i = 0; i < 16; ++i)
{
vp8_default_zig_zag_mask[vp8_default_zig_zag1d[i]] = 1 << i;
}
}
*/
DECLARE_ALIGNED(16, const short, vp8_default_zig_zag_mask[16]) = {
1, 2, 32, 64, 4, 16, 128, 4096, 8, 256, 2048, 8192, 512, 1024, 16384, -32768
};
const int vp8_mb_feature_data_bits[MB_LVL_MAX] = { 7, 6 };
/* Array indices are identical to previously-existing CONTEXT_NODE indices */
/* corresponding _CONTEXT_NODEs */
/* clang-format off */
const vp8_tree_index vp8_coef_tree[22] = {
-DCT_EOB_TOKEN, 2, /* 0 = EOB */
-ZERO_TOKEN, 4, /* 1 = ZERO */
-ONE_TOKEN, 6, /* 2 = ONE */
8, 12, /* 3 = LOW_VAL */
-TWO_TOKEN, 10, /* 4 = TWO */
-THREE_TOKEN, -FOUR_TOKEN, /* 5 = THREE */
14, 16, /* 6 = HIGH_LOW */
-DCT_VAL_CATEGORY1, -DCT_VAL_CATEGORY2, /* 7 = CAT_ONE */
18, 20, /* 8 = CAT_THREEFOUR */
-DCT_VAL_CATEGORY3, -DCT_VAL_CATEGORY4, /* 9 = CAT_THREE */
-DCT_VAL_CATEGORY5, -DCT_VAL_CATEGORY6 /* 10 = CAT_FIVE */
};
/* clang-format on */
/* vp8_coef_encodings generated with:
vp8_tokens_from_tree(vp8_coef_encodings, vp8_coef_tree);
*/
vp8_token vp8_coef_encodings[MAX_ENTROPY_TOKENS] = {
{ 2, 2 }, { 6, 3 }, { 28, 5 }, { 58, 6 }, { 59, 6 }, { 60, 6 },
{ 61, 6 }, { 124, 7 }, { 125, 7 }, { 126, 7 }, { 127, 7 }, { 0, 1 }
};
/* Trees for extra bits. Probabilities are constant and
do not depend on previously encoded bits */
static const vp8_prob Pcat1[] = { 159 };
static const vp8_prob Pcat2[] = { 165, 145 };
static const vp8_prob Pcat3[] = { 173, 148, 140 };
static const vp8_prob Pcat4[] = { 176, 155, 140, 135 };
static const vp8_prob Pcat5[] = { 180, 157, 141, 134, 130 };
static const vp8_prob Pcat6[] = { 254, 254, 243, 230, 196, 177,
153, 140, 133, 130, 129 };
/* tree index tables generated with:
void init_bit_tree(vp8_tree_index *p, int n) {
int i = 0;
while (++i < n) {
p[0] = p[1] = i << 1;
p += 2;
}
p[0] = p[1] = 0;
}
void init_bit_trees() {
init_bit_tree(cat1, 1);
init_bit_tree(cat2, 2);
init_bit_tree(cat3, 3);
init_bit_tree(cat4, 4);
init_bit_tree(cat5, 5);
init_bit_tree(cat6, 11);
}
*/
static const vp8_tree_index cat1[2] = { 0, 0 };
static const vp8_tree_index cat2[4] = { 2, 2, 0, 0 };
static const vp8_tree_index cat3[6] = { 2, 2, 4, 4, 0, 0 };
static const vp8_tree_index cat4[8] = { 2, 2, 4, 4, 6, 6, 0, 0 };
static const vp8_tree_index cat5[10] = { 2, 2, 4, 4, 6, 6, 8, 8, 0, 0 };
static const vp8_tree_index cat6[22] = { 2, 2, 4, 4, 6, 6, 8, 8,
10, 10, 12, 12, 14, 14, 16, 16,
18, 18, 20, 20, 0, 0 };
const vp8_extra_bit_struct vp8_extra_bits[12] = {
{ 0, 0, 0, 0 }, { 0, 0, 0, 1 }, { 0, 0, 0, 2 },
{ 0, 0, 0, 3 }, { 0, 0, 0, 4 }, { cat1, Pcat1, 1, 5 },
{ cat2, Pcat2, 2, 7 }, { cat3, Pcat3, 3, 11 }, { cat4, Pcat4, 4, 19 },
{ cat5, Pcat5, 5, 35 }, { cat6, Pcat6, 11, 67 }, { 0, 0, 0, 0 }
};
#include "default_coef_probs.h"
void vp8_default_coef_probs(VP8_COMMON *pc) {
memcpy(pc->fc.coef_probs, default_coef_probs, sizeof(default_coef_probs));
}