84 строки
3.2 KiB
C
84 строки
3.2 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#include <assert.h>
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#include "av1/common/entropy.h"
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#include "av1/decoder/dsubexp.h"
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static int inv_recenter_nonneg(int v, int m) {
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if (v > 2 * m) return v;
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return (v & 1) ? m - ((v + 1) >> 1) : m + (v >> 1);
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}
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static int decode_uniform(aom_reader *r) {
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const int l = 8;
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const int m = (1 << l) - 190;
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const int v = aom_read_literal(r, l - 1);
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return v < m ? v : (v << 1) - m + aom_read_bit(r);
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}
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static int inv_remap_prob(int v, int m) {
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static uint8_t inv_map_table[MAX_PROB - 1] = {
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7, 20, 33, 46, 59, 72, 85, 98, 111, 124, 137, 150, 163, 176, 189,
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202, 215, 228, 241, 254, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11,
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12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27,
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28, 29, 30, 31, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43,
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44, 45, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60,
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61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76,
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77, 78, 79, 80, 81, 82, 83, 84, 86, 87, 88, 89, 90, 91, 92,
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93, 94, 95, 96, 97, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108,
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109, 110, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 125,
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126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 138, 139, 140, 141,
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142, 143, 144, 145, 146, 147, 148, 149, 151, 152, 153, 154, 155, 156, 157,
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158, 159, 160, 161, 162, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173,
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174, 175, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 190,
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191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 203, 204, 205, 206,
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207, 208, 209, 210, 211, 212, 213, 214, 216, 217, 218, 219, 220, 221, 222,
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223, 224, 225, 226, 227, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238,
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239, 240, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253,
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};
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assert(v < (int)(sizeof(inv_map_table) / sizeof(inv_map_table[0])));
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v = inv_map_table[v];
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m--;
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if ((m << 1) <= MAX_PROB) {
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return 1 + inv_recenter_nonneg(v, m);
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} else {
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return MAX_PROB - inv_recenter_nonneg(v, MAX_PROB - 1 - m);
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}
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}
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static int decode_term_subexp(aom_reader *r) {
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if (!aom_read_bit(r)) return aom_read_literal(r, 4);
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if (!aom_read_bit(r)) return aom_read_literal(r, 4) + 16;
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if (!aom_read_bit(r)) return aom_read_literal(r, 5) + 32;
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return decode_uniform(r) + 64;
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}
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void av1_diff_update_prob(aom_reader *r, aom_prob *p) {
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if (aom_read(r, DIFF_UPDATE_PROB)) {
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const int delp = decode_term_subexp(r);
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*p = (aom_prob)inv_remap_prob(delp, *p);
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}
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}
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int aom_read_primitive_symmetric(aom_reader *r, unsigned int mag_bits) {
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if (aom_read_bit(r)) {
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int s = aom_read_bit(r);
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int x = aom_read_literal(r, mag_bits) + 1;
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return (s > 0 ? -x : x);
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} else {
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return 0;
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}
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}
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