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/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include <math.h>
#include "av1/common/common.h"
#include "av1/common/entropymode.h"
#include "av1/encoder/cost.h"
#include "av1/encoder/encodemv.h"
#include "aom_dsp/aom_dsp_common.h"
#include "aom_ports/bitops.h"
static INLINE int mv_class_base(MV_CLASS_TYPE c) {
return c ? CLASS0_SIZE << (c + 2) : 0;
}
// If n != 0, returns the floor of log base 2 of n. If n == 0, returns 0.
static INLINE uint8_t log_in_base_2(unsigned int n) {
// get_msb() is only valid when n != 0.
return n == 0 ? 0 : get_msb(n);
}
static INLINE MV_CLASS_TYPE get_mv_class(int z, int *offset) {
const MV_CLASS_TYPE c = (z >= CLASS0_SIZE * 4096)
? MV_CLASS_10
: (MV_CLASS_TYPE)log_in_base_2(z >> 3);
if (offset) *offset = z - mv_class_base(c);
return c;
}
static void encode_mv_component(aom_writer *w, int comp, nmv_component *mvcomp,
MvSubpelPrecision precision) {
assert(comp != 0);
int offset;
const int sign = comp < 0;
const int mag = sign ? -comp : comp;
const int mv_class = get_mv_class(mag - 1, &offset);
const int d = offset >> 3; // int mv data
const int fr = (offset >> 1) & 3; // fractional mv data
const int hp = offset & 1; // high precision mv data
// Sign
aom_write_symbol(w, sign, mvcomp->sign_cdf, 2);
// Class
aom_write_symbol(w, mv_class, mvcomp->classes_cdf, MV_CLASSES);
// Integer bits
if (mv_class == MV_CLASS_0) {
aom_write_symbol(w, d, mvcomp->class0_cdf, CLASS0_SIZE);
} else {
int i;
const int n = mv_class + CLASS0_BITS - 1; // number of bits
for (i = 0; i < n; ++i)
aom_write_symbol(w, (d >> i) & 1, mvcomp->bits_cdf[i], 2);
}
// Fractional bits
if (precision > MV_SUBPEL_NONE) {
aom_write_symbol(
w, fr,
mv_class == MV_CLASS_0 ? mvcomp->class0_fp_cdf[d] : mvcomp->fp_cdf,
MV_FP_SIZE);
}
// High precision bit
if (precision > MV_SUBPEL_LOW_PRECISION)
aom_write_symbol(
w, hp, mv_class == MV_CLASS_0 ? mvcomp->class0_hp_cdf : mvcomp->hp_cdf,
2);
}
static void build_nmv_component_cost_table(int *mvcost,
const nmv_component *const mvcomp,
MvSubpelPrecision precision) {
int i, v;
int sign_cost[2], class_cost[MV_CLASSES], class0_cost[CLASS0_SIZE];
int bits_cost[MV_OFFSET_BITS][2];
int class0_fp_cost[CLASS0_SIZE][MV_FP_SIZE], fp_cost[MV_FP_SIZE];
int class0_hp_cost[2], hp_cost[2];
av1_cost_tokens_from_cdf(sign_cost, mvcomp->sign_cdf, NULL);
av1_cost_tokens_from_cdf(class_cost, mvcomp->classes_cdf, NULL);
av1_cost_tokens_from_cdf(class0_cost, mvcomp->class0_cdf, NULL);
for (i = 0; i < MV_OFFSET_BITS; ++i) {
av1_cost_tokens_from_cdf(bits_cost[i], mvcomp->bits_cdf[i], NULL);
}
for (i = 0; i < CLASS0_SIZE; ++i)
av1_cost_tokens_from_cdf(class0_fp_cost[i], mvcomp->class0_fp_cdf[i], NULL);
av1_cost_tokens_from_cdf(fp_cost, mvcomp->fp_cdf, NULL);
if (precision > MV_SUBPEL_LOW_PRECISION) {
av1_cost_tokens_from_cdf(class0_hp_cost, mvcomp->class0_hp_cdf, NULL);
av1_cost_tokens_from_cdf(hp_cost, mvcomp->hp_cdf, NULL);
}
mvcost[0] = 0;
for (v = 1; v <= MV_MAX; ++v) {
int z, c, o, d, e, f, cost = 0;
z = v - 1;
c = get_mv_class(z, &o);
cost += class_cost[c];
d = (o >> 3); /* int mv data */
f = (o >> 1) & 3; /* fractional pel mv data */
e = (o & 1); /* high precision mv data */
if (c == MV_CLASS_0) {
cost += class0_cost[d];
} else {
const int b = c + CLASS0_BITS - 1; /* number of bits */
for (i = 0; i < b; ++i) cost += bits_cost[i][((d >> i) & 1)];
}
if (precision > MV_SUBPEL_NONE) {
if (c == MV_CLASS_0) {
cost += class0_fp_cost[d][f];
} else {
cost += fp_cost[f];
}
if (precision > MV_SUBPEL_LOW_PRECISION) {
if (c == MV_CLASS_0) {
cost += class0_hp_cost[e];
} else {
cost += hp_cost[e];
}
}
}
mvcost[v] = cost + sign_cost[0];
mvcost[-v] = cost + sign_cost[1];
}
}
void av1_encode_mv(AV1_COMP *cpi, aom_writer *w, const MV *mv, const MV *ref,
nmv_context *mvctx, int usehp) {
const MV diff = { mv->row - ref->row, mv->col - ref->col };
const MV_JOINT_TYPE j = av1_get_mv_joint(&diff);
if (cpi->common.cur_frame_force_integer_mv) {
usehp = MV_SUBPEL_NONE;
}
aom_write_symbol(w, j, mvctx->joints_cdf, MV_JOINTS);
if (mv_joint_vertical(j))
encode_mv_component(w, diff.row, &mvctx->comps[0], usehp);
if (mv_joint_horizontal(j))
encode_mv_component(w, diff.col, &mvctx->comps[1], usehp);
// If auto_mv_step_size is enabled then keep track of the largest
// motion vector component used.
if (cpi->sf.mv.auto_mv_step_size) {
unsigned int maxv = AOMMAX(abs(mv->row), abs(mv->col)) >> 3;
cpi->max_mv_magnitude = AOMMAX(maxv, cpi->max_mv_magnitude);
}
}
void av1_encode_dv(aom_writer *w, const MV *mv, const MV *ref,
nmv_context *mvctx) {
// DV and ref DV should not have sub-pel.
assert((mv->col & 7) == 0);
assert((mv->row & 7) == 0);
assert((ref->col & 7) == 0);
assert((ref->row & 7) == 0);
const MV diff = { mv->row - ref->row, mv->col - ref->col };
const MV_JOINT_TYPE j = av1_get_mv_joint(&diff);
aom_write_symbol(w, j, mvctx->joints_cdf, MV_JOINTS);
if (mv_joint_vertical(j))
encode_mv_component(w, diff.row, &mvctx->comps[0], MV_SUBPEL_NONE);
if (mv_joint_horizontal(j))
encode_mv_component(w, diff.col, &mvctx->comps[1], MV_SUBPEL_NONE);
}
void av1_build_nmv_cost_table(int *mvjoint, int *mvcost[2],
const nmv_context *ctx,
MvSubpelPrecision precision) {
av1_cost_tokens_from_cdf(mvjoint, ctx->joints_cdf, NULL);
build_nmv_component_cost_table(mvcost[0], &ctx->comps[0], precision);
build_nmv_component_cost_table(mvcost[1], &ctx->comps[1], precision);
}
int_mv av1_get_ref_mv_from_stack(int ref_idx,
const MV_REFERENCE_FRAME *ref_frame,
int ref_mv_idx,
const MB_MODE_INFO_EXT *mbmi_ext) {
const int8_t ref_frame_type = av1_ref_frame_type(ref_frame);
const CANDIDATE_MV *curr_ref_mv_stack =
mbmi_ext->ref_mv_stack[ref_frame_type];
int_mv ref_mv;
ref_mv.as_int = INVALID_MV;
if (ref_frame[1] > INTRA_FRAME) {
if (ref_idx == 0) {
ref_mv = curr_ref_mv_stack[ref_mv_idx].this_mv;
} else {
assert(ref_idx == 1);
ref_mv = curr_ref_mv_stack[ref_mv_idx].comp_mv;
}
} else {
assert(ref_idx == 0);
if (ref_mv_idx < mbmi_ext->ref_mv_count[ref_frame_type]) {
ref_mv = curr_ref_mv_stack[ref_mv_idx].this_mv;
} else {
ref_mv = mbmi_ext->global_mvs[ref_frame_type];
}
}
return ref_mv;
}
int_mv av1_get_ref_mv(const MACROBLOCK *x, int ref_idx) {
const MACROBLOCKD *xd = &x->e_mbd;
const MB_MODE_INFO *mbmi = xd->mi[0];
int ref_mv_idx = mbmi->ref_mv_idx;
if (mbmi->mode == NEAR_NEWMV || mbmi->mode == NEW_NEARMV) {
assert(has_second_ref(mbmi));
ref_mv_idx += 1;
}
return av1_get_ref_mv_from_stack(ref_idx, mbmi->ref_frame, ref_mv_idx,
x->mbmi_ext);
}
void av1_find_best_ref_mvs_from_stack(int allow_hp,
const MB_MODE_INFO_EXT *mbmi_ext,
MV_REFERENCE_FRAME ref_frame,
int_mv *nearest_mv, int_mv *near_mv,
int is_integer) {
const int ref_idx = 0;
MV_REFERENCE_FRAME ref_frames[2] = { ref_frame, NONE_FRAME };
*nearest_mv = av1_get_ref_mv_from_stack(ref_idx, ref_frames, 0, mbmi_ext);
lower_mv_precision(&nearest_mv->as_mv, allow_hp, is_integer);
*near_mv = av1_get_ref_mv_from_stack(ref_idx, ref_frames, 1, mbmi_ext);
lower_mv_precision(&near_mv->as_mv, allow_hp, is_integer);
}
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