ref: cdbd89197ec878c9c9fed8876c5c3f436ae8994d
dir: /vp8/encoder/tokenize.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 <math.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "onyx_int.h"
#include "tokenize.h"
#include "vpx_mem/vpx_mem.h"
/* Global event counters used for accumulating statistics across several
compressions, then generating context.c = initial stats. */
#ifdef VP8_ENTROPY_STATS
_int64 context_counters[BLOCK_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
[MAX_ENTROPY_TOKENS];
#endif
void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t);
void vp8_fix_contexts(MACROBLOCKD *x);
#include "dct_value_tokens.h"
#include "dct_value_cost.h"
const TOKENVALUE *const vp8_dct_value_tokens_ptr =
dct_value_tokens + DCT_MAX_VALUE;
const short *const vp8_dct_value_cost_ptr = dct_value_cost + DCT_MAX_VALUE;
#if 0
int skip_true_count = 0;
int skip_false_count = 0;
#endif
/* function used to generate dct_value_tokens and dct_value_cost tables */
/*
static void fill_value_tokens()
{
TOKENVALUE *t = dct_value_tokens + DCT_MAX_VALUE;
const vp8_extra_bit_struct *e = vp8_extra_bits;
int i = -DCT_MAX_VALUE;
int sign = 1;
do
{
if (!i)
sign = 0;
{
const int a = sign ? -i : i;
int eb = sign;
if (a > 4)
{
int j = 4;
while (++j < 11 && e[j].base_val <= a) {}
t[i].Token = --j;
eb |= (a - e[j].base_val) << 1;
}
else
t[i].Token = a;
t[i].Extra = eb;
}
// initialize the cost for extra bits for all possible coefficient
value.
{
int cost = 0;
const vp8_extra_bit_struct *p = vp8_extra_bits + t[i].Token;
if (p->base_val)
{
const int extra = t[i].Extra;
const int Length = p->Len;
if (Length)
cost += vp8_treed_cost(p->tree, p->prob, extra >> 1,
Length);
cost += vp8_cost_bit(vp8_prob_half, extra & 1); // sign
dct_value_cost[i + DCT_MAX_VALUE] = cost;
}
}
}
while (++i < DCT_MAX_VALUE);
vp8_dct_value_tokens_ptr = dct_value_tokens + DCT_MAX_VALUE;
vp8_dct_value_cost_ptr = dct_value_cost + DCT_MAX_VALUE;
}
*/
static void tokenize2nd_order_b(MACROBLOCK *x, TOKENEXTRA **tp, VP8_COMP *cpi) {
MACROBLOCKD *xd = &x->e_mbd;
int pt; /* near block/prev token context index */
int c; /* start at DC */
TOKENEXTRA *t = *tp; /* store tokens starting here */
const BLOCKD *b;
const short *qcoeff_ptr;
ENTROPY_CONTEXT *a;
ENTROPY_CONTEXT *l;
int band, rc, v, token;
int eob;
b = xd->block + 24;
qcoeff_ptr = b->qcoeff;
a = (ENTROPY_CONTEXT *)xd->above_context + 8;
l = (ENTROPY_CONTEXT *)xd->left_context + 8;
eob = xd->eobs[24];
VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
if (!eob) {
/* c = band for this case */
t->Token = DCT_EOB_TOKEN;
t->context_tree = cpi->common.fc.coef_probs[1][0][pt];
t->skip_eob_node = 0;
++x->coef_counts[1][0][pt][DCT_EOB_TOKEN];
t++;
*tp = t;
*a = *l = 0;
return;
}
v = qcoeff_ptr[0];
t->Extra = vp8_dct_value_tokens_ptr[v].Extra;
token = vp8_dct_value_tokens_ptr[v].Token;
t->Token = token;
t->context_tree = cpi->common.fc.coef_probs[1][0][pt];
t->skip_eob_node = 0;
++x->coef_counts[1][0][pt][token];
pt = vp8_prev_token_class[token];
t++;
c = 1;
for (; c < eob; ++c) {
rc = vp8_default_zig_zag1d[c];
band = vp8_coef_bands[c];
v = qcoeff_ptr[rc];
t->Extra = vp8_dct_value_tokens_ptr[v].Extra;
token = vp8_dct_value_tokens_ptr[v].Token;
t->Token = token;
t->context_tree = cpi->common.fc.coef_probs[1][band][pt];
t->skip_eob_node = ((pt == 0));
++x->coef_counts[1][band][pt][token];
pt = vp8_prev_token_class[token];
t++;
}
if (c < 16) {
band = vp8_coef_bands[c];
t->Token = DCT_EOB_TOKEN;
t->context_tree = cpi->common.fc.coef_probs[1][band][pt];
t->skip_eob_node = 0;
++x->coef_counts[1][band][pt][DCT_EOB_TOKEN];
t++;
}
*tp = t;
*a = *l = 1;
}
static void tokenize1st_order_b(
MACROBLOCK *x, TOKENEXTRA **tp,
int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */
VP8_COMP *cpi) {
MACROBLOCKD *xd = &x->e_mbd;
unsigned int block;
const BLOCKD *b;
int pt; /* near block/prev token context index */
int c;
int token;
TOKENEXTRA *t = *tp; /* store tokens starting here */
const short *qcoeff_ptr;
ENTROPY_CONTEXT *a;
ENTROPY_CONTEXT *l;
int band, rc, v;
int tmp1, tmp2;
b = xd->block;
/* Luma */
for (block = 0; block < 16; block++, b++) {
const int eob = *b->eob;
tmp1 = vp8_block2above[block];
tmp2 = vp8_block2left[block];
qcoeff_ptr = b->qcoeff;
a = (ENTROPY_CONTEXT *)xd->above_context + tmp1;
l = (ENTROPY_CONTEXT *)xd->left_context + tmp2;
VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
c = type ? 0 : 1;
if (c >= eob) {
/* c = band for this case */
t->Token = DCT_EOB_TOKEN;
t->context_tree = cpi->common.fc.coef_probs[type][c][pt];
t->skip_eob_node = 0;
++x->coef_counts[type][c][pt][DCT_EOB_TOKEN];
t++;
*tp = t;
*a = *l = 0;
continue;
}
v = qcoeff_ptr[c];
t->Extra = vp8_dct_value_tokens_ptr[v].Extra;
token = vp8_dct_value_tokens_ptr[v].Token;
t->Token = token;
t->context_tree = cpi->common.fc.coef_probs[type][c][pt];
t->skip_eob_node = 0;
++x->coef_counts[type][c][pt][token];
pt = vp8_prev_token_class[token];
t++;
c++;
assert(eob <= 16);
for (; c < eob; ++c) {
rc = vp8_default_zig_zag1d[c];
band = vp8_coef_bands[c];
v = qcoeff_ptr[rc];
t->Extra = vp8_dct_value_tokens_ptr[v].Extra;
token = vp8_dct_value_tokens_ptr[v].Token;
t->Token = token;
t->context_tree = cpi->common.fc.coef_probs[type][band][pt];
t->skip_eob_node = (pt == 0);
++x->coef_counts[type][band][pt][token];
pt = vp8_prev_token_class[token];
t++;
}
if (c < 16) {
band = vp8_coef_bands[c];
t->Token = DCT_EOB_TOKEN;
t->context_tree = cpi->common.fc.coef_probs[type][band][pt];
t->skip_eob_node = 0;
++x->coef_counts[type][band][pt][DCT_EOB_TOKEN];
t++;
}
*tp = t;
*a = *l = 1;
}
/* Chroma */
for (block = 16; block < 24; block++, b++) {
const int eob = *b->eob;
tmp1 = vp8_block2above[block];
tmp2 = vp8_block2left[block];
qcoeff_ptr = b->qcoeff;
a = (ENTROPY_CONTEXT *)xd->above_context + tmp1;
l = (ENTROPY_CONTEXT *)xd->left_context + tmp2;
VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
if (!eob) {
/* c = band for this case */
t->Token = DCT_EOB_TOKEN;
t->context_tree = cpi->common.fc.coef_probs[2][0][pt];
t->skip_eob_node = 0;
++x->coef_counts[2][0][pt][DCT_EOB_TOKEN];
t++;
*tp = t;
*a = *l = 0;
continue;
}
v = qcoeff_ptr[0];
t->Extra = vp8_dct_value_tokens_ptr[v].Extra;
token = vp8_dct_value_tokens_ptr[v].Token;
t->Token = token;
t->context_tree = cpi->common.fc.coef_probs[2][0][pt];
t->skip_eob_node = 0;
++x->coef_counts[2][0][pt][token];
pt = vp8_prev_token_class[token];
t++;
c = 1;
assert(eob <= 16);
for (; c < eob; ++c) {
rc = vp8_default_zig_zag1d[c];
band = vp8_coef_bands[c];
v = qcoeff_ptr[rc];
t->Extra = vp8_dct_value_tokens_ptr[v].Extra;
token = vp8_dct_value_tokens_ptr[v].Token;
t->Token = token;
t->context_tree = cpi->common.fc.coef_probs[2][band][pt];
t->skip_eob_node = (pt == 0);
++x->coef_counts[2][band][pt][token];
pt = vp8_prev_token_class[token];
t++;
}
if (c < 16) {
band = vp8_coef_bands[c];
t->Token = DCT_EOB_TOKEN;
t->context_tree = cpi->common.fc.coef_probs[2][band][pt];
t->skip_eob_node = 0;
++x->coef_counts[2][band][pt][DCT_EOB_TOKEN];
t++;
}
*tp = t;
*a = *l = 1;
}
}
static int mb_is_skippable(MACROBLOCKD *x, int has_y2_block) {
int skip = 1;
int i = 0;
if (has_y2_block) {
for (i = 0; i < 16; ++i) skip &= (x->eobs[i] < 2);
}
for (; i < 24 + has_y2_block; ++i) skip &= (!x->eobs[i]);
return skip;
}
void vp8_tokenize_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t) {
MACROBLOCKD *xd = &x->e_mbd;
int plane_type;
int has_y2_block;
has_y2_block = (xd->mode_info_context->mbmi.mode != B_PRED &&
xd->mode_info_context->mbmi.mode != SPLITMV);
xd->mode_info_context->mbmi.mb_skip_coeff = mb_is_skippable(xd, has_y2_block);
if (xd->mode_info_context->mbmi.mb_skip_coeff) {
if (!cpi->common.mb_no_coeff_skip) {
vp8_stuff_mb(cpi, x, t);
} else {
vp8_fix_contexts(xd);
x->skip_true_count++;
}
return;
}
plane_type = 3;
if (has_y2_block) {
tokenize2nd_order_b(x, t, cpi);
plane_type = 0;
}
tokenize1st_order_b(x, t, plane_type, cpi);
}
#ifdef VP8_ENTROPY_STATS
void init_context_counters(void) {
memset(context_counters, 0, sizeof(context_counters));
}
void print_context_counters() {
int type, band, pt, t;
FILE *const f = fopen("context.c", "w");
fprintf(f, "#include \"entropy.h\"\n");
fprintf(f, "\n/* *** GENERATED FILE: DO NOT EDIT *** */\n\n");
fprintf(f,
"int Contexts[BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] "
"[MAX_ENTROPY_TOKENS];\n\n");
fprintf(f,
"const int default_contexts[BLOCK_TYPES] [COEF_BANDS] "
"[PREV_COEF_CONTEXTS] [MAX_ENTROPY_TOKENS] = {");
#define Comma(X) (X ? "," : "")
type = 0;
do {
fprintf(f, "%s\n { /* block Type %d */", Comma(type), type);
band = 0;
do {
fprintf(f, "%s\n { /* Coeff Band %d */", Comma(band), band);
pt = 0;
do {
fprintf(f, "%s\n {", Comma(pt));
t = 0;
do {
const _int64 x = context_counters[type][band][pt][t];
const int y = (int)x;
assert(x == (_int64)y); /* no overflow handling yet */
fprintf(f, "%s %d", Comma(t), y);
} while (++t < MAX_ENTROPY_TOKENS);
fprintf(f, "}");
} while (++pt < PREV_COEF_CONTEXTS);
fprintf(f, "\n }");
} while (++band < COEF_BANDS);
fprintf(f, "\n }");
} while (++type < BLOCK_TYPES);
fprintf(f, "\n};\n");
fclose(f);
}
#endif
static void stuff2nd_order_b(TOKENEXTRA **tp, ENTROPY_CONTEXT *a,
ENTROPY_CONTEXT *l, VP8_COMP *cpi, MACROBLOCK *x) {
int pt; /* near block/prev token context index */
TOKENEXTRA *t = *tp; /* store tokens starting here */
VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
t->Token = DCT_EOB_TOKEN;
t->context_tree = cpi->common.fc.coef_probs[1][0][pt];
t->skip_eob_node = 0;
++x->coef_counts[1][0][pt][DCT_EOB_TOKEN];
++t;
*tp = t;
pt = 0;
*a = *l = pt;
}
static void stuff1st_order_b(TOKENEXTRA **tp, ENTROPY_CONTEXT *a,
ENTROPY_CONTEXT *l, int type, VP8_COMP *cpi,
MACROBLOCK *x) {
int pt; /* near block/prev token context index */
int band;
TOKENEXTRA *t = *tp; /* store tokens starting here */
VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
band = type ? 0 : 1;
t->Token = DCT_EOB_TOKEN;
t->context_tree = cpi->common.fc.coef_probs[type][band][pt];
t->skip_eob_node = 0;
++x->coef_counts[type][band][pt][DCT_EOB_TOKEN];
++t;
*tp = t;
pt = 0; /* 0 <-> all coeff data is zero */
*a = *l = pt;
}
static void stuff1st_order_buv(TOKENEXTRA **tp, ENTROPY_CONTEXT *a,
ENTROPY_CONTEXT *l, VP8_COMP *cpi,
MACROBLOCK *x) {
int pt; /* near block/prev token context index */
TOKENEXTRA *t = *tp; /* store tokens starting here */
VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
t->Token = DCT_EOB_TOKEN;
t->context_tree = cpi->common.fc.coef_probs[2][0][pt];
t->skip_eob_node = 0;
++x->coef_counts[2][0][pt][DCT_EOB_TOKEN];
++t;
*tp = t;
pt = 0; /* 0 <-> all coeff data is zero */
*a = *l = pt;
}
void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t) {
MACROBLOCKD *xd = &x->e_mbd;
ENTROPY_CONTEXT *A = (ENTROPY_CONTEXT *)xd->above_context;
ENTROPY_CONTEXT *L = (ENTROPY_CONTEXT *)xd->left_context;
int plane_type;
int b;
plane_type = 3;
if ((xd->mode_info_context->mbmi.mode != B_PRED &&
xd->mode_info_context->mbmi.mode != SPLITMV)) {
stuff2nd_order_b(t, A + vp8_block2above[24], L + vp8_block2left[24], cpi,
x);
plane_type = 0;
}
for (b = 0; b < 16; ++b) {
stuff1st_order_b(t, A + vp8_block2above[b], L + vp8_block2left[b],
plane_type, cpi, x);
}
for (b = 16; b < 24; ++b) {
stuff1st_order_buv(t, A + vp8_block2above[b], L + vp8_block2left[b], cpi,
x);
}
}
void vp8_fix_contexts(MACROBLOCKD *x) {
/* Clear entropy contexts for Y2 blocks */
if (x->mode_info_context->mbmi.mode != B_PRED &&
x->mode_info_context->mbmi.mode != SPLITMV) {
memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
} else {
memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES) - 1);
memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES) - 1);
}
}