cost.c (1936B)
1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved. 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 #include <assert.h> 12 13 #include "aom_dsp/entcode.h" 14 #include "av1/encoder/cost.h" 15 #include "av1/common/entropy.h" 16 17 // round(-log2(i/256.) * (1 << AV1_PROB_COST_SHIFT)); i = 128~255. 18 const uint16_t av1_prob_cost[128] = { 19 512, 506, 501, 495, 489, 484, 478, 473, 467, 462, 456, 451, 446, 441, 435, 20 430, 425, 420, 415, 410, 405, 400, 395, 390, 385, 380, 375, 371, 366, 361, 21 356, 352, 347, 343, 338, 333, 329, 324, 320, 316, 311, 307, 302, 298, 294, 22 289, 285, 281, 277, 273, 268, 264, 260, 256, 252, 248, 244, 240, 236, 232, 23 228, 224, 220, 216, 212, 209, 205, 201, 197, 194, 190, 186, 182, 179, 175, 24 171, 168, 164, 161, 157, 153, 150, 146, 143, 139, 136, 132, 129, 125, 122, 25 119, 115, 112, 109, 105, 102, 99, 95, 92, 89, 86, 82, 79, 76, 73, 26 70, 66, 63, 60, 57, 54, 51, 48, 45, 42, 38, 35, 32, 29, 26, 27 23, 20, 18, 15, 12, 9, 6, 3, 28 }; 29 30 void av1_cost_tokens_from_cdf(int *costs, const aom_cdf_prob *cdf, 31 const int *inv_map) { 32 int i; 33 aom_cdf_prob prev_cdf = 0; 34 for (i = 0;; ++i) { 35 aom_cdf_prob p15 = AOM_ICDF(cdf[i]) - prev_cdf; 36 p15 = (p15 < EC_MIN_PROB) ? EC_MIN_PROB : p15; 37 prev_cdf = AOM_ICDF(cdf[i]); 38 39 if (inv_map) 40 costs[inv_map[i]] = av1_cost_symbol(p15); 41 else 42 costs[i] = av1_cost_symbol(p15); 43 44 // Stop once we reach the end of the CDF 45 if (cdf[i] == AOM_ICDF(CDF_PROB_TOP)) break; 46 } 47 }