chromium/third_party/libvpx/source/libvpx/vp8/encoder/encodemv.c

/*
 *  Copyright (c) 2010 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.
 */

#include "vp8/common/common.h"
#include "encodemv.h"
#include "vp8/common/entropymode.h"
#include "vp8/common/systemdependent.h"
#include "vpx_ports/system_state.h"

#include <math.h>

static void encode_mvcomponent(vp8_writer *const w, const int v,
                               const struct mv_context *mvc) { … }
#if 0
static int max_mv_r = 0;
static int max_mv_c = 0;
#endif
void vp8_encode_motion_vector(vp8_writer *w, const MV *mv,
                              const MV_CONTEXT *mvc) { … }

static unsigned int cost_mvcomponent(const int v,
                                     const struct mv_context *mvc) { … }

void vp8_build_component_cost_table(int *mvcost[2], const MV_CONTEXT *mvc,
                                    int mvc_flag[2]) { … }

/* Motion vector probability table update depends on benefit.
 * Small correction allows for the fact that an update to an MV probability
 * may have benefit in subsequent frames as well as the current one.
 */
#define MV_PROB_UPDATE_CORRECTION …

static void calc_prob(vp8_prob *p, const unsigned int ct[2]) { … }

static void update(vp8_writer *const w, const unsigned int ct[2],
                   vp8_prob *const cur_p, const vp8_prob new_p,
                   const vp8_prob update_p, int *updated) { … }

static void write_component_probs(vp8_writer *const w,
                                  struct mv_context *cur_mvc,
                                  const struct mv_context *default_mvc_,
                                  const struct mv_context *update_mvc,
                                  const unsigned int events[MVvals],
                                  unsigned int rc, int *updated) { … }

void vp8_write_mvprobs(VP8_COMP *cpi) { … }