381 lines
8.9 KiB
C
381 lines
8.9 KiB
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 <math.h>
|
|
|
|
#ifdef ENTROPY_STATS
|
|
extern unsigned int active_section;
|
|
#endif
|
|
|
|
static void encode_mvcomponent(
|
|
vp8_writer *const w,
|
|
const int v,
|
|
const struct mv_context *mvc
|
|
)
|
|
{
|
|
const vp8_prob *p = mvc->prob;
|
|
const int x = v < 0 ? -v : v;
|
|
|
|
if (x < mvnum_short) /* Small */
|
|
{
|
|
vp8_write(w, 0, p [mvpis_short]);
|
|
vp8_treed_write(w, vp8_small_mvtree, p + MVPshort, x, 3);
|
|
|
|
if (!x)
|
|
return; /* no sign bit */
|
|
}
|
|
else /* Large */
|
|
{
|
|
int i = 0;
|
|
|
|
vp8_write(w, 1, p [mvpis_short]);
|
|
|
|
do
|
|
vp8_write(w, (x >> i) & 1, p [MVPbits + i]);
|
|
|
|
while (++i < 3);
|
|
|
|
i = mvlong_width - 1; /* Skip bit 3, which is sometimes implicit */
|
|
|
|
do
|
|
vp8_write(w, (x >> i) & 1, p [MVPbits + i]);
|
|
|
|
while (--i > 3);
|
|
|
|
if (x & 0xFFF0)
|
|
vp8_write(w, (x >> 3) & 1, p [MVPbits + 3]);
|
|
}
|
|
|
|
vp8_write(w, v < 0, p [MVPsign]);
|
|
}
|
|
#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)
|
|
{
|
|
|
|
#if 0
|
|
{
|
|
if (abs(mv->row >> 1) > max_mv_r)
|
|
{
|
|
FILE *f = fopen("maxmv.stt", "a");
|
|
max_mv_r = abs(mv->row >> 1);
|
|
fprintf(f, "New Mv Row Max %6d\n", (mv->row >> 1));
|
|
|
|
if ((abs(mv->row) / 2) != max_mv_r)
|
|
fprintf(f, "MV Row conversion error %6d\n", abs(mv->row) / 2);
|
|
|
|
fclose(f);
|
|
}
|
|
|
|
if (abs(mv->col >> 1) > max_mv_c)
|
|
{
|
|
FILE *f = fopen("maxmv.stt", "a");
|
|
fprintf(f, "New Mv Col Max %6d\n", (mv->col >> 1));
|
|
max_mv_c = abs(mv->col >> 1);
|
|
fclose(f);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
encode_mvcomponent(w, mv->row >> 1, &mvc[0]);
|
|
encode_mvcomponent(w, mv->col >> 1, &mvc[1]);
|
|
}
|
|
|
|
|
|
static unsigned int cost_mvcomponent(const int v, const struct mv_context *mvc)
|
|
{
|
|
const vp8_prob *p = mvc->prob;
|
|
const int x = v;
|
|
unsigned int cost;
|
|
|
|
if (x < mvnum_short)
|
|
{
|
|
cost = vp8_cost_zero(p [mvpis_short])
|
|
+ vp8_treed_cost(vp8_small_mvtree, p + MVPshort, x, 3);
|
|
|
|
if (!x)
|
|
return cost;
|
|
}
|
|
else
|
|
{
|
|
int i = 0;
|
|
cost = vp8_cost_one(p [mvpis_short]);
|
|
|
|
do
|
|
cost += vp8_cost_bit(p [MVPbits + i], (x >> i) & 1);
|
|
|
|
while (++i < 3);
|
|
|
|
i = mvlong_width - 1; /* Skip bit 3, which is sometimes implicit */
|
|
|
|
do
|
|
cost += vp8_cost_bit(p [MVPbits + i], (x >> i) & 1);
|
|
|
|
while (--i > 3);
|
|
|
|
if (x & 0xFFF0)
|
|
cost += vp8_cost_bit(p [MVPbits + 3], (x >> 3) & 1);
|
|
}
|
|
|
|
return cost; /* + vp8_cost_bit( p [MVPsign], v < 0); */
|
|
}
|
|
|
|
void vp8_build_component_cost_table(int *mvcost[2], const MV_CONTEXT *mvc, int mvc_flag[2])
|
|
{
|
|
int i = 1;
|
|
unsigned int cost0 = 0;
|
|
unsigned int cost1 = 0;
|
|
|
|
vp8_clear_system_state();
|
|
|
|
i = 1;
|
|
|
|
if (mvc_flag[0])
|
|
{
|
|
mvcost [0] [0] = cost_mvcomponent(0, &mvc[0]);
|
|
|
|
do
|
|
{
|
|
cost0 = cost_mvcomponent(i, &mvc[0]);
|
|
|
|
mvcost [0] [i] = cost0 + vp8_cost_zero(mvc[0].prob[MVPsign]);
|
|
mvcost [0] [-i] = cost0 + vp8_cost_one(mvc[0].prob[MVPsign]);
|
|
}
|
|
while (++i <= mv_max);
|
|
}
|
|
|
|
i = 1;
|
|
|
|
if (mvc_flag[1])
|
|
{
|
|
mvcost [1] [0] = cost_mvcomponent(0, &mvc[1]);
|
|
|
|
do
|
|
{
|
|
cost1 = cost_mvcomponent(i, &mvc[1]);
|
|
|
|
mvcost [1] [i] = cost1 + vp8_cost_zero(mvc[1].prob[MVPsign]);
|
|
mvcost [1] [-i] = cost1 + vp8_cost_one(mvc[1].prob[MVPsign]);
|
|
}
|
|
while (++i <= mv_max);
|
|
}
|
|
}
|
|
|
|
|
|
/* 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 -1
|
|
|
|
|
|
static void calc_prob(vp8_prob *p, const unsigned int ct[2])
|
|
{
|
|
const unsigned int tot = ct[0] + ct[1];
|
|
|
|
if (tot)
|
|
{
|
|
const vp8_prob x = ((ct[0] * 255) / tot) & -2;
|
|
*p = x ? x : 1;
|
|
}
|
|
}
|
|
|
|
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
|
|
)
|
|
{
|
|
const int cur_b = vp8_cost_branch(ct, *cur_p);
|
|
const int new_b = vp8_cost_branch(ct, new_p);
|
|
const int cost = 7 + MV_PROB_UPDATE_CORRECTION + ((vp8_cost_one(update_p) - vp8_cost_zero(update_p) + 128) >> 8);
|
|
|
|
if (cur_b - new_b > cost)
|
|
{
|
|
*cur_p = new_p;
|
|
vp8_write(w, 1, update_p);
|
|
vp8_write_literal(w, new_p >> 1, 7);
|
|
*updated = 1;
|
|
|
|
}
|
|
else
|
|
vp8_write(w, 0, update_p);
|
|
}
|
|
|
|
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
|
|
)
|
|
{
|
|
vp8_prob *Pcur = cur_mvc->prob;
|
|
const vp8_prob *default_mvc = default_mvc_->prob;
|
|
const vp8_prob *Pupdate = update_mvc->prob;
|
|
unsigned int is_short_ct[2], sign_ct[2];
|
|
|
|
unsigned int bit_ct [mvlong_width] [2];
|
|
|
|
unsigned int short_ct [mvnum_short];
|
|
unsigned int short_bct [mvnum_short-1] [2];
|
|
|
|
vp8_prob Pnew [MVPcount];
|
|
|
|
(void) rc;
|
|
vp8_copy_array(Pnew, default_mvc, MVPcount);
|
|
|
|
vp8_zero(is_short_ct)
|
|
vp8_zero(sign_ct)
|
|
vp8_zero(bit_ct)
|
|
vp8_zero(short_ct)
|
|
vp8_zero(short_bct)
|
|
|
|
|
|
/* j=0 */
|
|
{
|
|
const int c = events [mv_max];
|
|
|
|
is_short_ct [0] += c; /* Short vector */
|
|
short_ct [0] += c; /* Magnitude distribution */
|
|
}
|
|
|
|
/* j: 1 ~ mv_max (1023) */
|
|
{
|
|
int j = 1;
|
|
|
|
do
|
|
{
|
|
const int c1 = events [mv_max + j]; /* positive */
|
|
const int c2 = events [mv_max - j]; /* negative */
|
|
const int c = c1 + c2;
|
|
int a = j;
|
|
|
|
sign_ct [0] += c1;
|
|
sign_ct [1] += c2;
|
|
|
|
if (a < mvnum_short)
|
|
{
|
|
is_short_ct [0] += c; /* Short vector */
|
|
short_ct [a] += c; /* Magnitude distribution */
|
|
}
|
|
else
|
|
{
|
|
int k = mvlong_width - 1;
|
|
is_short_ct [1] += c; /* Long vector */
|
|
|
|
/* bit 3 not always encoded. */
|
|
do
|
|
bit_ct [k] [(a >> k) & 1] += c;
|
|
|
|
while (--k >= 0);
|
|
}
|
|
}
|
|
while (++j <= mv_max);
|
|
}
|
|
|
|
calc_prob(Pnew + mvpis_short, is_short_ct);
|
|
|
|
calc_prob(Pnew + MVPsign, sign_ct);
|
|
|
|
{
|
|
vp8_prob p [mvnum_short - 1]; /* actually only need branch ct */
|
|
int j = 0;
|
|
|
|
vp8_tree_probs_from_distribution(
|
|
8, vp8_small_mvencodings, vp8_small_mvtree,
|
|
p, short_bct, short_ct,
|
|
256, 1
|
|
);
|
|
|
|
do
|
|
calc_prob(Pnew + MVPshort + j, short_bct[j]);
|
|
|
|
while (++j < mvnum_short - 1);
|
|
}
|
|
|
|
{
|
|
int j = 0;
|
|
|
|
do
|
|
calc_prob(Pnew + MVPbits + j, bit_ct[j]);
|
|
|
|
while (++j < mvlong_width);
|
|
}
|
|
|
|
update(w, is_short_ct, Pcur + mvpis_short, Pnew[mvpis_short], *Pupdate++, updated);
|
|
|
|
update(w, sign_ct, Pcur + MVPsign, Pnew[MVPsign], *Pupdate++, updated);
|
|
|
|
{
|
|
const vp8_prob *const new_p = Pnew + MVPshort;
|
|
vp8_prob *const cur_p = Pcur + MVPshort;
|
|
|
|
int j = 0;
|
|
|
|
do
|
|
|
|
update(w, short_bct[j], cur_p + j, new_p[j], *Pupdate++, updated);
|
|
|
|
while (++j < mvnum_short - 1);
|
|
}
|
|
|
|
{
|
|
const vp8_prob *const new_p = Pnew + MVPbits;
|
|
vp8_prob *const cur_p = Pcur + MVPbits;
|
|
|
|
int j = 0;
|
|
|
|
do
|
|
|
|
update(w, bit_ct[j], cur_p + j, new_p[j], *Pupdate++, updated);
|
|
|
|
while (++j < mvlong_width);
|
|
}
|
|
}
|
|
|
|
void vp8_write_mvprobs(VP8_COMP *cpi)
|
|
{
|
|
vp8_writer *const w = cpi->bc;
|
|
MV_CONTEXT *mvc = cpi->common.fc.mvc;
|
|
int flags[2] = {0, 0};
|
|
#ifdef ENTROPY_STATS
|
|
active_section = 4;
|
|
#endif
|
|
write_component_probs(
|
|
w, &mvc[0], &vp8_default_mv_context[0], &vp8_mv_update_probs[0],
|
|
cpi->mb.MVcount[0], 0, &flags[0]
|
|
);
|
|
write_component_probs(
|
|
w, &mvc[1], &vp8_default_mv_context[1], &vp8_mv_update_probs[1],
|
|
cpi->mb.MVcount[1], 1, &flags[1]
|
|
);
|
|
|
|
if (flags[0] || flags[1])
|
|
vp8_build_component_cost_table(cpi->mb.mvcost, (const MV_CONTEXT *) cpi->common.fc.mvc, flags);
|
|
|
|
#ifdef ENTROPY_STATS
|
|
active_section = 5;
|
|
#endif
|
|
}
|