47d6f16a04
promote the unsigned int calculation to uint64_t rather than int64_t for type consistency Change-Id: Ic34dee1dc707d9faf6a3ae250bfe39b60bef3438
107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
/*
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* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VPX_DSP_PROB_H_
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#define VPX_DSP_PROB_H_
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#include <assert.h>
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#include "./vpx_config.h"
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#include "./vpx_dsp_common.h"
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#include "vpx_ports/mem.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef uint8_t vpx_prob;
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#define MAX_PROB 255
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#define vpx_prob_half ((vpx_prob)128)
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typedef int8_t vpx_tree_index;
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#define TREE_SIZE(leaf_count) (2 * (leaf_count)-2)
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#define vpx_complement(x) (255 - x)
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#define MODE_MV_COUNT_SAT 20
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/* We build coding trees compactly in arrays.
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Each node of the tree is a pair of vpx_tree_indices.
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Array index often references a corresponding probability table.
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Index <= 0 means done encoding/decoding and value = -Index,
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Index > 0 means need another bit, specification at index.
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Nonnegative indices are always even; processing begins at node 0. */
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typedef const vpx_tree_index vpx_tree[];
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static INLINE vpx_prob get_prob(unsigned int num, unsigned int den) {
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assert(den != 0);
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{
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const int p = (int)(((uint64_t)num * 256 + (den >> 1)) / den);
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// (p > 255) ? 255 : (p < 1) ? 1 : p;
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const int clipped_prob = p | ((255 - p) >> 23) | (p == 0);
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return (vpx_prob)clipped_prob;
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}
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}
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static INLINE vpx_prob get_binary_prob(unsigned int n0, unsigned int n1) {
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const unsigned int den = n0 + n1;
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if (den == 0) return 128u;
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return get_prob(n0, den);
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}
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/* This function assumes prob1 and prob2 are already within [1,255] range. */
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static INLINE vpx_prob weighted_prob(int prob1, int prob2, int factor) {
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return ROUND_POWER_OF_TWO(prob1 * (256 - factor) + prob2 * factor, 8);
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}
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static INLINE vpx_prob merge_probs(vpx_prob pre_prob, const unsigned int ct[2],
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unsigned int count_sat,
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unsigned int max_update_factor) {
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const vpx_prob prob = get_binary_prob(ct[0], ct[1]);
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const unsigned int count = VPXMIN(ct[0] + ct[1], count_sat);
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const unsigned int factor = max_update_factor * count / count_sat;
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return weighted_prob(pre_prob, prob, factor);
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}
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// MODE_MV_MAX_UPDATE_FACTOR (128) * count / MODE_MV_COUNT_SAT;
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static const int count_to_update_factor[MODE_MV_COUNT_SAT + 1] = {
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0, 6, 12, 19, 25, 32, 38, 44, 51, 57, 64,
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70, 76, 83, 89, 96, 102, 108, 115, 121, 128
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};
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static INLINE vpx_prob mode_mv_merge_probs(vpx_prob pre_prob,
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const unsigned int ct[2]) {
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const unsigned int den = ct[0] + ct[1];
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if (den == 0) {
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return pre_prob;
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} else {
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const unsigned int count = VPXMIN(den, MODE_MV_COUNT_SAT);
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const unsigned int factor = count_to_update_factor[count];
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const vpx_prob prob = get_prob(ct[0], den);
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return weighted_prob(pre_prob, prob, factor);
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}
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}
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void vpx_tree_merge_probs(const vpx_tree_index *tree, const vpx_prob *pre_probs,
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const unsigned int *counts, vpx_prob *probs);
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DECLARE_ALIGNED(16, extern const uint8_t, vpx_norm[256]);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VPX_DSP_PROB_H_
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