| /* |
| * Copyright (c) 2021, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 3-Clause Clear License |
| * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear |
| * License was not distributed with this source code in the LICENSE file, you |
| * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. If the |
| * Alliance for Open Media Patent License 1.0 was not distributed with this |
| * source code in the PATENTS file, you can obtain it at |
| * aomedia.org/license/patent-license/. |
| */ |
| #include <assert.h> |
| |
| #include "av1/encoder/cost.h" |
| #include "av1/common/entropy.h" |
| |
| // round(-log2(i/256.) * (1 << AV1_PROB_COST_SHIFT)); i = 128~255. |
| const uint16_t av1_prob_cost[128] = { |
| 512, 506, 501, 495, 489, 484, 478, 473, 467, 462, 456, 451, 446, 441, 435, |
| 430, 425, 420, 415, 410, 405, 400, 395, 390, 385, 380, 375, 371, 366, 361, |
| 356, 352, 347, 343, 338, 333, 329, 324, 320, 316, 311, 307, 302, 298, 294, |
| 289, 285, 281, 277, 273, 268, 264, 260, 256, 252, 248, 244, 240, 236, 232, |
| 228, 224, 220, 216, 212, 209, 205, 201, 197, 194, 190, 186, 182, 179, 175, |
| 171, 168, 164, 161, 157, 153, 150, 146, 143, 139, 136, 132, 129, 125, 122, |
| 119, 115, 112, 109, 105, 102, 99, 95, 92, 89, 86, 82, 79, 76, 73, |
| 70, 66, 63, 60, 57, 54, 51, 48, 45, 42, 38, 35, 32, 29, 26, |
| 23, 20, 18, 15, 12, 9, 6, 3, |
| }; |
| |
| void av1_cost_tokens_from_cdf(int *costs, const aom_cdf_prob *cdf, |
| const int *inv_map) { |
| int i; |
| aom_cdf_prob prev_cdf = 0; |
| for (i = 0;; ++i) { |
| aom_cdf_prob p15 = AOM_ICDF(cdf[i]) - prev_cdf; |
| p15 = (p15 < EC_MIN_PROB) ? EC_MIN_PROB : p15; |
| prev_cdf = AOM_ICDF(cdf[i]); |
| |
| if (inv_map) |
| costs[inv_map[i]] = av1_cost_symbol(p15); |
| else |
| costs[i] = av1_cost_symbol(p15); |
| |
| // Stop once we reach the end of the CDF |
| if (cdf[i] == AOM_ICDF(CDF_PROB_TOP)) break; |
| } |
| } |