acb9460929
swap '{' and c-style comments removing a few redundant ones along the
way; covers most leftovers from the clang-tidy run against an
x86_64-linux config.
Change-Id: I67a45596f80a12389faca49c5be440875092a7df
331 lines
8.5 KiB
C
331 lines
8.5 KiB
C
/*
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* Copyright (c) 2010 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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#include "vp8/common/common.h"
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#include "encodemv.h"
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#include "vp8/common/entropymode.h"
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#include "vp8/common/systemdependent.h"
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#include "vpx_ports/system_state.h"
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#include <math.h>
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#ifdef VP8_ENTROPY_STATS
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extern unsigned int active_section;
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#endif
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static void encode_mvcomponent(vp8_writer *const w, const int v,
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const struct mv_context *mvc) {
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const vp8_prob *p = mvc->prob;
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const int x = v < 0 ? -v : v;
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if (x < mvnum_short) { /* Small */
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vp8_write(w, 0, p[mvpis_short]);
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vp8_treed_write(w, vp8_small_mvtree, p + MVPshort, x, 3);
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if (!x) return; /* no sign bit */
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} else { /* Large */
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int i = 0;
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vp8_write(w, 1, p[mvpis_short]);
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do
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vp8_write(w, (x >> i) & 1, p[MVPbits + i]);
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while (++i < 3);
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i = mvlong_width - 1; /* Skip bit 3, which is sometimes implicit */
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do
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vp8_write(w, (x >> i) & 1, p[MVPbits + i]);
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while (--i > 3);
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if (x & 0xFFF0) vp8_write(w, (x >> 3) & 1, p[MVPbits + 3]);
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}
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vp8_write(w, v < 0, p[MVPsign]);
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}
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#if 0
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static int max_mv_r = 0;
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static int max_mv_c = 0;
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#endif
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void vp8_encode_motion_vector(vp8_writer *w, const MV *mv,
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const MV_CONTEXT *mvc) {
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#if 0
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{
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if (abs(mv->row >> 1) > max_mv_r)
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{
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FILE *f = fopen("maxmv.stt", "a");
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max_mv_r = abs(mv->row >> 1);
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fprintf(f, "New Mv Row Max %6d\n", (mv->row >> 1));
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if ((abs(mv->row) / 2) != max_mv_r)
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fprintf(f, "MV Row conversion error %6d\n", abs(mv->row) / 2);
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fclose(f);
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}
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if (abs(mv->col >> 1) > max_mv_c)
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{
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FILE *f = fopen("maxmv.stt", "a");
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fprintf(f, "New Mv Col Max %6d\n", (mv->col >> 1));
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max_mv_c = abs(mv->col >> 1);
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fclose(f);
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}
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}
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#endif
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encode_mvcomponent(w, mv->row >> 1, &mvc[0]);
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encode_mvcomponent(w, mv->col >> 1, &mvc[1]);
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}
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static unsigned int cost_mvcomponent(const int v,
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const struct mv_context *mvc) {
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const vp8_prob *p = mvc->prob;
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const int x = v;
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unsigned int cost;
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if (x < mvnum_short) {
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cost = vp8_cost_zero(p[mvpis_short]) +
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vp8_treed_cost(vp8_small_mvtree, p + MVPshort, x, 3);
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if (!x) return cost;
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} else {
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int i = 0;
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cost = vp8_cost_one(p[mvpis_short]);
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do {
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cost += vp8_cost_bit(p[MVPbits + i], (x >> i) & 1);
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} while (++i < 3);
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i = mvlong_width - 1; /* Skip bit 3, which is sometimes implicit */
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do {
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cost += vp8_cost_bit(p[MVPbits + i], (x >> i) & 1);
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} while (--i > 3);
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if (x & 0xFFF0) cost += vp8_cost_bit(p[MVPbits + 3], (x >> 3) & 1);
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}
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return cost; /* + vp8_cost_bit( p [MVPsign], v < 0); */
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}
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void vp8_build_component_cost_table(int *mvcost[2], const MV_CONTEXT *mvc,
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int mvc_flag[2]) {
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int i = 1;
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unsigned int cost0 = 0;
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unsigned int cost1 = 0;
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vpx_clear_system_state();
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i = 1;
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if (mvc_flag[0]) {
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mvcost[0][0] = cost_mvcomponent(0, &mvc[0]);
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do {
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cost0 = cost_mvcomponent(i, &mvc[0]);
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mvcost[0][i] = cost0 + vp8_cost_zero(mvc[0].prob[MVPsign]);
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mvcost[0][-i] = cost0 + vp8_cost_one(mvc[0].prob[MVPsign]);
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} while (++i <= mv_max);
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}
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i = 1;
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if (mvc_flag[1]) {
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mvcost[1][0] = cost_mvcomponent(0, &mvc[1]);
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do {
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cost1 = cost_mvcomponent(i, &mvc[1]);
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mvcost[1][i] = cost1 + vp8_cost_zero(mvc[1].prob[MVPsign]);
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mvcost[1][-i] = cost1 + vp8_cost_one(mvc[1].prob[MVPsign]);
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} while (++i <= mv_max);
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}
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}
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/* Motion vector probability table update depends on benefit.
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* Small correction allows for the fact that an update to an MV probability
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* may have benefit in subsequent frames as well as the current one.
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*/
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#define MV_PROB_UPDATE_CORRECTION -1
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static void calc_prob(vp8_prob *p, const unsigned int ct[2]) {
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const unsigned int tot = ct[0] + ct[1];
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if (tot) {
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const vp8_prob x = ((ct[0] * 255) / tot) & -2;
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*p = x ? x : 1;
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}
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}
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static void update(vp8_writer *const w, const unsigned int ct[2],
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vp8_prob *const cur_p, const vp8_prob new_p,
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const vp8_prob update_p, int *updated) {
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const int cur_b = vp8_cost_branch(ct, *cur_p);
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const int new_b = vp8_cost_branch(ct, new_p);
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const int cost =
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7 + MV_PROB_UPDATE_CORRECTION +
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((vp8_cost_one(update_p) - vp8_cost_zero(update_p) + 128) >> 8);
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if (cur_b - new_b > cost) {
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*cur_p = new_p;
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vp8_write(w, 1, update_p);
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vp8_write_literal(w, new_p >> 1, 7);
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*updated = 1;
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} else
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vp8_write(w, 0, update_p);
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}
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static void write_component_probs(vp8_writer *const w,
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struct mv_context *cur_mvc,
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const struct mv_context *default_mvc_,
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const struct mv_context *update_mvc,
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const unsigned int events[MVvals],
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unsigned int rc, int *updated) {
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vp8_prob *Pcur = cur_mvc->prob;
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const vp8_prob *default_mvc = default_mvc_->prob;
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const vp8_prob *Pupdate = update_mvc->prob;
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unsigned int is_short_ct[2], sign_ct[2];
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unsigned int bit_ct[mvlong_width][2];
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unsigned int short_ct[mvnum_short];
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unsigned int short_bct[mvnum_short - 1][2];
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vp8_prob Pnew[MVPcount];
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(void)rc;
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vp8_copy_array(Pnew, default_mvc, MVPcount);
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vp8_zero(is_short_ct) vp8_zero(sign_ct) vp8_zero(bit_ct) vp8_zero(short_ct)
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vp8_zero(short_bct)
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/* j=0 */
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{
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const int c = events[mv_max];
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is_short_ct[0] += c; /* Short vector */
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short_ct[0] += c; /* Magnitude distribution */
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}
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/* j: 1 ~ mv_max (1023) */
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{
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int j = 1;
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do {
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const int c1 = events[mv_max + j]; /* positive */
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const int c2 = events[mv_max - j]; /* negative */
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const int c = c1 + c2;
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int a = j;
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sign_ct[0] += c1;
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sign_ct[1] += c2;
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if (a < mvnum_short) {
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is_short_ct[0] += c; /* Short vector */
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short_ct[a] += c; /* Magnitude distribution */
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} else {
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int k = mvlong_width - 1;
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is_short_ct[1] += c; /* Long vector */
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/* bit 3 not always encoded. */
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do {
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bit_ct[k][(a >> k) & 1] += c;
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} while (--k >= 0);
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}
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} while (++j <= mv_max);
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}
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calc_prob(Pnew + mvpis_short, is_short_ct);
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calc_prob(Pnew + MVPsign, sign_ct);
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{
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vp8_prob p[mvnum_short - 1]; /* actually only need branch ct */
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int j = 0;
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vp8_tree_probs_from_distribution(8, vp8_small_mvencodings, vp8_small_mvtree,
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p, short_bct, short_ct, 256, 1);
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do {
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calc_prob(Pnew + MVPshort + j, short_bct[j]);
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} while (++j < mvnum_short - 1);
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}
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{
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int j = 0;
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do {
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calc_prob(Pnew + MVPbits + j, bit_ct[j]);
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} while (++j < mvlong_width);
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}
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update(w, is_short_ct, Pcur + mvpis_short, Pnew[mvpis_short], *Pupdate++,
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updated);
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update(w, sign_ct, Pcur + MVPsign, Pnew[MVPsign], *Pupdate++, updated);
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{
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const vp8_prob *const new_p = Pnew + MVPshort;
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vp8_prob *const cur_p = Pcur + MVPshort;
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int j = 0;
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do {
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update(w, short_bct[j], cur_p + j, new_p[j], *Pupdate++, updated);
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} while (++j < mvnum_short - 1);
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}
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{
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const vp8_prob *const new_p = Pnew + MVPbits;
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vp8_prob *const cur_p = Pcur + MVPbits;
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int j = 0;
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do {
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update(w, bit_ct[j], cur_p + j, new_p[j], *Pupdate++, updated);
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} while (++j < mvlong_width);
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}
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}
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void vp8_write_mvprobs(VP8_COMP *cpi) {
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vp8_writer *const w = cpi->bc;
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MV_CONTEXT *mvc = cpi->common.fc.mvc;
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int flags[2] = { 0, 0 };
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#ifdef VP8_ENTROPY_STATS
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active_section = 4;
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#endif
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write_component_probs(w, &mvc[0], &vp8_default_mv_context[0],
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&vp8_mv_update_probs[0], cpi->mb.MVcount[0], 0,
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&flags[0]);
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write_component_probs(w, &mvc[1], &vp8_default_mv_context[1],
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&vp8_mv_update_probs[1], cpi->mb.MVcount[1], 1,
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&flags[1]);
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if (flags[0] || flags[1]) {
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vp8_build_component_cost_table(
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cpi->mb.mvcost, (const MV_CONTEXT *)cpi->common.fc.mvc, flags);
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}
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#ifdef VP8_ENTROPY_STATS
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active_section = 5;
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#endif
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}
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