chromium/third_party/libvpx/source/libvpx/vpx_dsp/prob.h

/*
 *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef VPX_VPX_DSP_PROB_H_
#define VPX_VPX_DSP_PROB_H_

#include <assert.h>

#include "./vpx_config.h"
#include "./vpx_dsp_common.h"

#include "vpx_ports/mem.h"

#ifdef __cplusplus
extern "C" {
#endif

vpx_prob;

#define MAX_PROB …

#define vpx_prob_half …

vpx_tree_index;

#define TREE_SIZE(leaf_count) …

#define vpx_complement(x) …

#define MODE_MV_COUNT_SAT …

/* We build coding trees compactly in arrays.
   Each node of the tree is a pair of vpx_tree_indices.
   Array index often references a corresponding probability table.
   Index <= 0 means done encoding/decoding and value = -Index,
   Index > 0 means need another bit, specification at index.
   Nonnegative indices are always even;  processing begins at node 0. */

vpx_tree;

static INLINE vpx_prob get_prob(unsigned int num, unsigned int den) { … }

static INLINE vpx_prob get_binary_prob(unsigned int n0, unsigned int n1) { … }

/* This function assumes prob1 and prob2 are already within [1,255] range. */
static INLINE vpx_prob weighted_prob(int prob1, int prob2, int factor) { … }

static INLINE vpx_prob merge_probs(vpx_prob pre_prob, const unsigned int ct[2],
                                   unsigned int count_sat,
                                   unsigned int max_update_factor) { … }

// MODE_MV_MAX_UPDATE_FACTOR (128) * count / MODE_MV_COUNT_SAT;
static const int count_to_update_factor[MODE_MV_COUNT_SAT + 1] = …;

static INLINE vpx_prob mode_mv_merge_probs(vpx_prob pre_prob,
                                           const unsigned int ct[2]) { … }

void vpx_tree_merge_probs(const vpx_tree_index *tree, const vpx_prob *pre_probs,
                          const unsigned int *counts, vpx_prob *probs);

DECLARE_ALIGNED(…);

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // VPX_VPX_DSP_PROB_H_