62a94a649d
This causes rANS to operate at the same precision as the Daala EC.
aom/master stats: rans10uabs8lbase12 → rans15uabs8lbase15
objective-1-fast
PSNR YCbCr: 0.01% 0.01% 0.01%
PSNRHVS: 0.01%
SSIM: 0.01%
MSSSIM: 0.01%
CIEDE2000: 0.01%
subset1
PSNR YCbCr: -0.01% -0.00% -0.00%
PSNRHVS: -0.01%
SSIM: -0.01%
MSSSIM: -0.01%
CIEDE2000: -0.01%
(cherry picked from aom/master commit ddbc2e2a68bfc997dc61fca5bcaac3a75245e965)
Change-Id: I6ef0a4f6198784b3712a61af9f105d560a22eaea
45 lines
1.4 KiB
C
45 lines
1.4 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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#ifndef AOM_DSP_ANS_H_
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#define AOM_DSP_ANS_H_
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// Constants, types and utilities for Asymmetric Numeral Systems
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// http://arxiv.org/abs/1311.2540v2
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#include <assert.h>
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#include "./aom_config.h"
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#include "aom/aom_integer.h"
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#include "aom_dsp/prob.h"
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#ifdef __cplusplus
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extern "C" {
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#endif // __cplusplus
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typedef uint8_t AnsP8;
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#define ANS_P8_PRECISION 256u
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#define ANS_P8_SHIFT 8
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#define RANS_PROB_BITS 15
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#define RANS_PRECISION (1u << RANS_PROB_BITS)
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// L_BASE % PRECISION must be 0. Increasing L_BASE beyond 2**15 will cause uabs
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// to overflow.
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#define L_BASE (RANS_PRECISION)
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#define IO_BASE 256
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// Range I = { L_BASE, L_BASE + 1, ..., L_BASE * IO_BASE - 1 }
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void aom_rans_merge_prob8_pdf(aom_cdf_prob *const out_pdf,
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const AnsP8 node_prob,
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const aom_cdf_prob *const src_pdf, int in_syms);
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#ifdef __cplusplus
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} // extern "C"
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#endif // __cplusplus
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#endif // AOM_DSP_ANS_H_
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