ref: 704afd0c7aa9100cd0d5c18993e1e7254d3ca9b6
dir: /vp9/common/vp9_entropymv.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 "vp9/common/vp9_onyxc_int.h"
#include "vp9/common/vp9_entropymv.h"
//#define MV_COUNT_TESTING
#define MV_COUNT_SAT 20
#define MV_MAX_UPDATE_FACTOR 128
/* Integer pel reference mv threshold for use of high-precision 1/8 mv */
#define COMPANDED_MVREF_THRESH 8
/* Smooth or bias the mv-counts before prob computation */
/* #define SMOOTH_MV_COUNTS */
const vp9_tree_index vp9_mv_joint_tree[2 * MV_JOINTS - 2] = {
-MV_JOINT_ZERO, 2,
-MV_JOINT_HNZVZ, 4,
-MV_JOINT_HZVNZ, -MV_JOINT_HNZVNZ
};
struct vp9_token vp9_mv_joint_encodings[MV_JOINTS];
const vp9_tree_index vp9_mv_class_tree[2 * MV_CLASSES - 2] = {
-MV_CLASS_0, 2,
-MV_CLASS_1, 4,
6, 8,
-MV_CLASS_2, -MV_CLASS_3,
10, 12,
-MV_CLASS_4, -MV_CLASS_5,
-MV_CLASS_6, 14,
16, 18,
-MV_CLASS_7, -MV_CLASS_8,
-MV_CLASS_9, -MV_CLASS_10,
};
struct vp9_token vp9_mv_class_encodings[MV_CLASSES];
const vp9_tree_index vp9_mv_class0_tree [2 * CLASS0_SIZE - 2] = {
-0, -1,
};
struct vp9_token vp9_mv_class0_encodings[CLASS0_SIZE];
const vp9_tree_index vp9_mv_fp_tree [2 * 4 - 2] = {
-0, 2,
-1, 4,
-2, -3
};
struct vp9_token vp9_mv_fp_encodings[4];
const nmv_context vp9_default_nmv_context = {
{32, 64, 96},
{
{ /* vert component */
128, /* sign */
{224, 144, 192, 168, 192, 176, 192, 198, 198, 245}, /* class */
{216}, /* class0 */
{136, 140, 148, 160, 176, 192, 224, 234, 234, 240}, /* bits */
{{128, 128, 64}, {96, 112, 64}}, /* class0_fp */
{64, 96, 64}, /* fp */
160, /* class0_hp bit */
128, /* hp */
},
{ /* hor component */
128, /* sign */
{216, 128, 176, 160, 176, 176, 192, 198, 198, 208}, /* class */
{208}, /* class0 */
{136, 140, 148, 160, 176, 192, 224, 234, 234, 240}, /* bits */
{{128, 128, 64}, {96, 112, 64}}, /* class0_fp */
{64, 96, 64}, /* fp */
160, /* class0_hp bit */
128, /* hp */
}
},
};
#define mv_class_base(c) ((c) ? (CLASS0_SIZE << (c + 2)) : 0)
MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset) {
MV_CLASS_TYPE c;
if (z < CLASS0_SIZE * 8) c = MV_CLASS_0;
else if (z < CLASS0_SIZE * 16) c = MV_CLASS_1;
else if (z < CLASS0_SIZE * 32) c = MV_CLASS_2;
else if (z < CLASS0_SIZE * 64) c = MV_CLASS_3;
else if (z < CLASS0_SIZE * 128) c = MV_CLASS_4;
else if (z < CLASS0_SIZE * 256) c = MV_CLASS_5;
else if (z < CLASS0_SIZE * 512) c = MV_CLASS_6;
else if (z < CLASS0_SIZE * 1024) c = MV_CLASS_7;
else if (z < CLASS0_SIZE * 2048) c = MV_CLASS_8;
else if (z < CLASS0_SIZE * 4096) c = MV_CLASS_9;
else if (z < CLASS0_SIZE * 8192) c = MV_CLASS_10;
else assert(0);
if (offset)
*offset = z - mv_class_base(c);
return c;
}
int vp9_use_mv_hp(const MV *ref) {
return (abs(ref->row) >> 3) < COMPANDED_MVREF_THRESH &&
(abs(ref->col) >> 3) < COMPANDED_MVREF_THRESH;
}
int vp9_get_mv_mag(MV_CLASS_TYPE c, int offset) {
return mv_class_base(c) + offset;
}
static void inc_mv_component_count(int v, nmv_component_counts *comp_counts,
int incr) {
assert (v != 0);
comp_counts->mvcount[MV_MAX + v] += incr;
}
static void inc_mv_component(int v, nmv_component_counts *comp_counts,
int incr, int usehp) {
int s, z, c, o, d, e, f;
if (!incr)
return;
assert (v != 0); /* should not be zero */
s = v < 0;
comp_counts->sign[s] += incr;
z = (s ? -v : v) - 1; /* magnitude - 1 */
c = vp9_get_mv_class(z, &o);
comp_counts->classes[c] += incr;
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) {
comp_counts->class0[d] += incr;
} else {
int i;
int b = c + CLASS0_BITS - 1; // number of bits
for (i = 0; i < b; ++i)
comp_counts->bits[i][((d >> i) & 1)] += incr;
}
/* Code the fractional pel bits */
if (c == MV_CLASS_0) {
comp_counts->class0_fp[d][f] += incr;
} else {
comp_counts->fp[f] += incr;
}
/* Code the high precision bit */
if (usehp) {
if (c == MV_CLASS_0) {
comp_counts->class0_hp[e] += incr;
} else {
comp_counts->hp[e] += incr;
}
}
}
#ifdef SMOOTH_MV_COUNTS
static void smooth_counts(nmv_component_counts *mvcomp) {
static const int flen = 3; // (filter_length + 1) / 2
static const int fval[] = {8, 3, 1};
static const int fvalbits = 4;
int i;
unsigned int smvcount[MV_VALS];
vpx_memcpy(smvcount, mvcomp->mvcount, sizeof(smvcount));
smvcount[MV_MAX] = (smvcount[MV_MAX - 1] + smvcount[MV_MAX + 1]) >> 1;
for (i = flen - 1; i <= MV_VALS - flen; ++i) {
int j, s = smvcount[i] * fval[0];
for (j = 1; j < flen; ++j)
s += (smvcount[i - j] + smvcount[i + j]) * fval[j];
mvcomp->mvcount[i] = (s + (1 << (fvalbits - 1))) >> fvalbits;
}
}
#endif
static void counts_to_context(nmv_component_counts *mvcomp, int usehp) {
int v;
vpx_memset(mvcomp->sign, 0, sizeof(nmv_component_counts) - sizeof(mvcomp->mvcount));
for (v = 1; v <= MV_MAX; v++) {
inc_mv_component(-v, mvcomp, mvcomp->mvcount[MV_MAX - v], usehp);
inc_mv_component( v, mvcomp, mvcomp->mvcount[MV_MAX + v], usehp);
}
}
void vp9_inc_mv(const MV *mv, const MV *ref, nmv_context_counts *mvctx,
int usehp) {
const MV_JOINT_TYPE j = vp9_get_mv_joint(mv);
mvctx->joints[j]++;
usehp = usehp && vp9_use_mv_hp(ref);
if (mv_joint_vertical(j))
inc_mv_component_count(mv->row, &mvctx->comps[0], 1);
if (mv_joint_horizontal(j))
inc_mv_component_count(mv->col, &mvctx->comps[1], 1);
}
static void adapt_prob(vp9_prob *dest, vp9_prob prep, unsigned int ct[2]) {
const int count = MIN(ct[0] + ct[1], MV_COUNT_SAT);
if (count) {
const vp9_prob newp = get_binary_prob(ct[0], ct[1]);
const int factor = MV_MAX_UPDATE_FACTOR * count / MV_COUNT_SAT;
*dest = weighted_prob(prep, newp, factor);
} else {
*dest = prep;
}
}
void vp9_counts_process(nmv_context_counts *nmv_count, int usehp) {
counts_to_context(&nmv_count->comps[0], usehp);
counts_to_context(&nmv_count->comps[1], usehp);
}
static unsigned int adapt_probs(unsigned int i,
vp9_tree tree,
vp9_prob this_probs[],
const vp9_prob last_probs[],
const unsigned int num_events[]) {
vp9_prob this_prob;
const uint32_t left = tree[i] <= 0
? num_events[-tree[i]]
: adapt_probs(tree[i], tree, this_probs, last_probs, num_events);
const uint32_t right = tree[i + 1] <= 0
? num_events[-tree[i + 1]]
: adapt_probs(tree[i + 1], tree, this_probs, last_probs, num_events);
uint32_t weight = left + right;
if (weight) {
this_prob = get_binary_prob(left, right);
weight = weight > MV_COUNT_SAT ? MV_COUNT_SAT : weight;
this_prob = weighted_prob(last_probs[i >> 1], this_prob,
MV_MAX_UPDATE_FACTOR * weight / MV_COUNT_SAT);
} else {
this_prob = last_probs[i >> 1];
}
this_probs[i >> 1] = this_prob;
return left + right;
}
void vp9_adapt_mv_probs(VP9_COMMON *cm, int usehp) {
int i, j;
#ifdef MV_COUNT_TESTING
printf("joints count: ");
for (j = 0; j < MV_JOINTS; ++j) printf("%d ", cm->fc.NMVcount.joints[j]);
printf("\n"); fflush(stdout);
printf("signs count:\n");
for (i = 0; i < 2; ++i)
printf("%d/%d ", cm->fc.NMVcount.comps[i].sign[0], cm->fc.NMVcount.comps[i].sign[1]);
printf("\n"); fflush(stdout);
printf("classes count:\n");
for (i = 0; i < 2; ++i) {
for (j = 0; j < MV_CLASSES; ++j)
printf("%d ", cm->fc.NMVcount.comps[i].classes[j]);
printf("\n"); fflush(stdout);
}
printf("class0 count:\n");
for (i = 0; i < 2; ++i) {
for (j = 0; j < CLASS0_SIZE; ++j)
printf("%d ", cm->fc.NMVcount.comps[i].class0[j]);
printf("\n"); fflush(stdout);
}
printf("bits count:\n");
for (i = 0; i < 2; ++i) {
for (j = 0; j < MV_OFFSET_BITS; ++j)
printf("%d/%d ", cm->fc.NMVcount.comps[i].bits[j][0],
cm->fc.NMVcount.comps[i].bits[j][1]);
printf("\n"); fflush(stdout);
}
printf("class0_fp count:\n");
for (i = 0; i < 2; ++i) {
for (j = 0; j < CLASS0_SIZE; ++j) {
printf("{");
for (k = 0; k < 4; ++k)
printf("%d ", cm->fc.NMVcount.comps[i].class0_fp[j][k]);
printf("}, ");
}
printf("\n"); fflush(stdout);
}
printf("fp count:\n");
for (i = 0; i < 2; ++i) {
for (j = 0; j < 4; ++j)
printf("%d ", cm->fc.NMVcount.comps[i].fp[j]);
printf("\n"); fflush(stdout);
}
if (usehp) {
printf("class0_hp count:\n");
for (i = 0; i < 2; ++i)
printf("%d/%d ", cm->fc.NMVcount.comps[i].class0_hp[0],
cm->fc.NMVcount.comps[i].class0_hp[1]);
printf("\n"); fflush(stdout);
printf("hp count:\n");
for (i = 0; i < 2; ++i)
printf("%d/%d ", cm->fc.NMVcount.comps[i].hp[0],
cm->fc.NMVcount.comps[i].hp[1]);
printf("\n"); fflush(stdout);
}
#endif
#ifdef SMOOTH_MV_COUNTS
smooth_counts(&cm->fc.NMVcount.comps[0]);
smooth_counts(&cm->fc.NMVcount.comps[1]);
#endif
vp9_counts_process(&cm->fc.NMVcount, usehp);
adapt_probs(0, vp9_mv_joint_tree,
cm->fc.nmvc.joints, cm->fc.pre_nmvc.joints,
cm->fc.NMVcount.joints);
for (i = 0; i < 2; ++i) {
adapt_prob(&cm->fc.nmvc.comps[i].sign,
cm->fc.pre_nmvc.comps[i].sign,
cm->fc.NMVcount.comps[i].sign);
adapt_probs(0, vp9_mv_class_tree,
cm->fc.nmvc.comps[i].classes, cm->fc.pre_nmvc.comps[i].classes,
cm->fc.NMVcount.comps[i].classes);
adapt_probs(0, vp9_mv_class0_tree,
cm->fc.nmvc.comps[i].class0, cm->fc.pre_nmvc.comps[i].class0,
cm->fc.NMVcount.comps[i].class0);
for (j = 0; j < MV_OFFSET_BITS; ++j) {
adapt_prob(&cm->fc.nmvc.comps[i].bits[j],
cm->fc.pre_nmvc.comps[i].bits[j],
cm->fc.NMVcount.comps[i].bits[j]);
}
}
for (i = 0; i < 2; ++i) {
for (j = 0; j < CLASS0_SIZE; ++j) {
adapt_probs(0, vp9_mv_fp_tree,
cm->fc.nmvc.comps[i].class0_fp[j],
cm->fc.pre_nmvc.comps[i].class0_fp[j],
cm->fc.NMVcount.comps[i].class0_fp[j]);
}
adapt_probs(0, vp9_mv_fp_tree,
cm->fc.nmvc.comps[i].fp,
cm->fc.pre_nmvc.comps[i].fp,
cm->fc.NMVcount.comps[i].fp);
}
if (usehp) {
for (i = 0; i < 2; ++i) {
adapt_prob(&cm->fc.nmvc.comps[i].class0_hp,
cm->fc.pre_nmvc.comps[i].class0_hp,
cm->fc.NMVcount.comps[i].class0_hp);
adapt_prob(&cm->fc.nmvc.comps[i].hp,
cm->fc.pre_nmvc.comps[i].hp,
cm->fc.NMVcount.comps[i].hp);
}
}
}
void vp9_entropy_mv_init() {
vp9_tokens_from_tree(vp9_mv_joint_encodings, vp9_mv_joint_tree);
vp9_tokens_from_tree(vp9_mv_class_encodings, vp9_mv_class_tree);
vp9_tokens_from_tree(vp9_mv_class0_encodings, vp9_mv_class0_tree);
vp9_tokens_from_tree(vp9_mv_fp_encodings, vp9_mv_fp_tree);
}
void vp9_init_mv_probs(VP9_COMMON *cm) {
vpx_memcpy(&cm->fc.nmvc, &vp9_default_nmv_context, sizeof(nmv_context));
}