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https://repo.dactyloidae.xyz/Dactyloidae/UXP.git
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239 lines
8.3 KiB
C
239 lines
8.3 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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#include <math.h>
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#include "av1/common/common.h"
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#include "av1/common/entropymode.h"
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#include "av1/encoder/cost.h"
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#include "av1/encoder/encodemv.h"
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#include "aom_dsp/aom_dsp_common.h"
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#include "aom_ports/bitops.h"
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static INLINE int mv_class_base(MV_CLASS_TYPE c) {
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return c ? CLASS0_SIZE << (c + 2) : 0;
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}
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// If n != 0, returns the floor of log base 2 of n. If n == 0, returns 0.
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static INLINE uint8_t log_in_base_2(unsigned int n) {
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// get_msb() is only valid when n != 0.
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return n == 0 ? 0 : get_msb(n);
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}
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static INLINE MV_CLASS_TYPE get_mv_class(int z, int *offset) {
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const MV_CLASS_TYPE c = (z >= CLASS0_SIZE * 4096)
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? MV_CLASS_10
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: (MV_CLASS_TYPE)log_in_base_2(z >> 3);
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if (offset) *offset = z - mv_class_base(c);
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return c;
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}
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static void encode_mv_component(aom_writer *w, int comp, nmv_component *mvcomp,
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MvSubpelPrecision precision) {
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assert(comp != 0);
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int offset;
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const int sign = comp < 0;
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const int mag = sign ? -comp : comp;
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const int mv_class = get_mv_class(mag - 1, &offset);
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const int d = offset >> 3; // int mv data
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const int fr = (offset >> 1) & 3; // fractional mv data
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const int hp = offset & 1; // high precision mv data
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// Sign
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aom_write_symbol(w, sign, mvcomp->sign_cdf, 2);
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// Class
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aom_write_symbol(w, mv_class, mvcomp->classes_cdf, MV_CLASSES);
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// Integer bits
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if (mv_class == MV_CLASS_0) {
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aom_write_symbol(w, d, mvcomp->class0_cdf, CLASS0_SIZE);
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} else {
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int i;
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const int n = mv_class + CLASS0_BITS - 1; // number of bits
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for (i = 0; i < n; ++i)
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aom_write_symbol(w, (d >> i) & 1, mvcomp->bits_cdf[i], 2);
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}
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// Fractional bits
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if (precision > MV_SUBPEL_NONE) {
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aom_write_symbol(
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w, fr,
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mv_class == MV_CLASS_0 ? mvcomp->class0_fp_cdf[d] : mvcomp->fp_cdf,
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MV_FP_SIZE);
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}
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// High precision bit
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if (precision > MV_SUBPEL_LOW_PRECISION)
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aom_write_symbol(
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w, hp, mv_class == MV_CLASS_0 ? mvcomp->class0_hp_cdf : mvcomp->hp_cdf,
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2);
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}
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static void build_nmv_component_cost_table(int *mvcost,
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const nmv_component *const mvcomp,
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MvSubpelPrecision precision) {
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int i, v;
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int sign_cost[2], class_cost[MV_CLASSES], class0_cost[CLASS0_SIZE];
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int bits_cost[MV_OFFSET_BITS][2];
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int class0_fp_cost[CLASS0_SIZE][MV_FP_SIZE], fp_cost[MV_FP_SIZE];
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int class0_hp_cost[2], hp_cost[2];
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av1_cost_tokens_from_cdf(sign_cost, mvcomp->sign_cdf, NULL);
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av1_cost_tokens_from_cdf(class_cost, mvcomp->classes_cdf, NULL);
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av1_cost_tokens_from_cdf(class0_cost, mvcomp->class0_cdf, NULL);
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for (i = 0; i < MV_OFFSET_BITS; ++i) {
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av1_cost_tokens_from_cdf(bits_cost[i], mvcomp->bits_cdf[i], NULL);
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}
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for (i = 0; i < CLASS0_SIZE; ++i)
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av1_cost_tokens_from_cdf(class0_fp_cost[i], mvcomp->class0_fp_cdf[i], NULL);
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av1_cost_tokens_from_cdf(fp_cost, mvcomp->fp_cdf, NULL);
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if (precision > MV_SUBPEL_LOW_PRECISION) {
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av1_cost_tokens_from_cdf(class0_hp_cost, mvcomp->class0_hp_cdf, NULL);
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av1_cost_tokens_from_cdf(hp_cost, mvcomp->hp_cdf, NULL);
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}
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mvcost[0] = 0;
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for (v = 1; v <= MV_MAX; ++v) {
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int z, c, o, d, e, f, cost = 0;
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z = v - 1;
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c = get_mv_class(z, &o);
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cost += class_cost[c];
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d = (o >> 3); /* int mv data */
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f = (o >> 1) & 3; /* fractional pel mv data */
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e = (o & 1); /* high precision mv data */
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if (c == MV_CLASS_0) {
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cost += class0_cost[d];
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} else {
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const int b = c + CLASS0_BITS - 1; /* number of bits */
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for (i = 0; i < b; ++i) cost += bits_cost[i][((d >> i) & 1)];
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}
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if (precision > MV_SUBPEL_NONE) {
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if (c == MV_CLASS_0) {
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cost += class0_fp_cost[d][f];
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} else {
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cost += fp_cost[f];
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}
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if (precision > MV_SUBPEL_LOW_PRECISION) {
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if (c == MV_CLASS_0) {
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cost += class0_hp_cost[e];
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} else {
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cost += hp_cost[e];
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}
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}
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}
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mvcost[v] = cost + sign_cost[0];
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mvcost[-v] = cost + sign_cost[1];
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}
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}
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void av1_encode_mv(AV1_COMP *cpi, aom_writer *w, const MV *mv, const MV *ref,
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nmv_context *mvctx, int usehp) {
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const MV diff = { mv->row - ref->row, mv->col - ref->col };
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const MV_JOINT_TYPE j = av1_get_mv_joint(&diff);
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if (cpi->common.cur_frame_force_integer_mv) {
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usehp = MV_SUBPEL_NONE;
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}
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aom_write_symbol(w, j, mvctx->joints_cdf, MV_JOINTS);
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if (mv_joint_vertical(j))
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encode_mv_component(w, diff.row, &mvctx->comps[0], usehp);
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if (mv_joint_horizontal(j))
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encode_mv_component(w, diff.col, &mvctx->comps[1], usehp);
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// If auto_mv_step_size is enabled then keep track of the largest
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// motion vector component used.
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if (cpi->sf.mv.auto_mv_step_size) {
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unsigned int maxv = AOMMAX(abs(mv->row), abs(mv->col)) >> 3;
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cpi->max_mv_magnitude = AOMMAX(maxv, cpi->max_mv_magnitude);
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}
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}
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void av1_encode_dv(aom_writer *w, const MV *mv, const MV *ref,
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nmv_context *mvctx) {
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// DV and ref DV should not have sub-pel.
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assert((mv->col & 7) == 0);
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assert((mv->row & 7) == 0);
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assert((ref->col & 7) == 0);
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assert((ref->row & 7) == 0);
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const MV diff = { mv->row - ref->row, mv->col - ref->col };
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const MV_JOINT_TYPE j = av1_get_mv_joint(&diff);
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aom_write_symbol(w, j, mvctx->joints_cdf, MV_JOINTS);
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if (mv_joint_vertical(j))
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encode_mv_component(w, diff.row, &mvctx->comps[0], MV_SUBPEL_NONE);
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if (mv_joint_horizontal(j))
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encode_mv_component(w, diff.col, &mvctx->comps[1], MV_SUBPEL_NONE);
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}
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void av1_build_nmv_cost_table(int *mvjoint, int *mvcost[2],
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const nmv_context *ctx,
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MvSubpelPrecision precision) {
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av1_cost_tokens_from_cdf(mvjoint, ctx->joints_cdf, NULL);
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build_nmv_component_cost_table(mvcost[0], &ctx->comps[0], precision);
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build_nmv_component_cost_table(mvcost[1], &ctx->comps[1], precision);
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}
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int_mv av1_get_ref_mv_from_stack(int ref_idx,
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const MV_REFERENCE_FRAME *ref_frame,
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int ref_mv_idx,
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const MB_MODE_INFO_EXT *mbmi_ext) {
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const int8_t ref_frame_type = av1_ref_frame_type(ref_frame);
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const CANDIDATE_MV *curr_ref_mv_stack =
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mbmi_ext->ref_mv_stack[ref_frame_type];
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int_mv ref_mv;
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ref_mv.as_int = INVALID_MV;
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if (ref_frame[1] > INTRA_FRAME) {
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if (ref_idx == 0) {
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ref_mv = curr_ref_mv_stack[ref_mv_idx].this_mv;
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} else {
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assert(ref_idx == 1);
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ref_mv = curr_ref_mv_stack[ref_mv_idx].comp_mv;
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}
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} else {
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assert(ref_idx == 0);
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if (ref_mv_idx < mbmi_ext->ref_mv_count[ref_frame_type]) {
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ref_mv = curr_ref_mv_stack[ref_mv_idx].this_mv;
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} else {
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ref_mv = mbmi_ext->global_mvs[ref_frame_type];
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}
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}
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return ref_mv;
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}
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int_mv av1_get_ref_mv(const MACROBLOCK *x, int ref_idx) {
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const MACROBLOCKD *xd = &x->e_mbd;
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const MB_MODE_INFO *mbmi = xd->mi[0];
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int ref_mv_idx = mbmi->ref_mv_idx;
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if (mbmi->mode == NEAR_NEWMV || mbmi->mode == NEW_NEARMV) {
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assert(has_second_ref(mbmi));
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ref_mv_idx += 1;
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}
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return av1_get_ref_mv_from_stack(ref_idx, mbmi->ref_frame, ref_mv_idx,
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x->mbmi_ext);
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}
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void av1_find_best_ref_mvs_from_stack(int allow_hp,
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const MB_MODE_INFO_EXT *mbmi_ext,
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MV_REFERENCE_FRAME ref_frame,
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int_mv *nearest_mv, int_mv *near_mv,
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int is_integer) {
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const int ref_idx = 0;
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MV_REFERENCE_FRAME ref_frames[2] = { ref_frame, NONE_FRAME };
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*nearest_mv = av1_get_ref_mv_from_stack(ref_idx, ref_frames, 0, mbmi_ext);
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lower_mv_precision(&nearest_mv->as_mv, allow_hp, is_integer);
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*near_mv = av1_get_ref_mv_from_stack(ref_idx, ref_frames, 1, mbmi_ext);
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lower_mv_precision(&near_mv->as_mv, allow_hp, is_integer);
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}
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