ref: b844e50a61c3382bccb8e27fea8114386fc03850
dir: /vp9/encoder/vp9_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 "vp9/encoder/vp9_onyx_int.h"
#include "vp9/encoder/vp9_tokenize.h"
#include "vpx_mem/vpx_mem.h"
#include "vp9/common/vp9_pred_common.h"
#include "vp9/common/vp9_seg_common.h"
#include "vp9/common/vp9_entropy.h"
/* Global event counters used for accumulating statistics across several
compressions, then generating vp9_context.c = initial stats. */
#ifdef ENTROPY_STATS
vp9_coeff_accum context_counters_4x4[BLOCK_TYPES];
vp9_coeff_accum context_counters_8x8[BLOCK_TYPES];
vp9_coeff_accum context_counters_16x16[BLOCK_TYPES];
vp9_coeff_accum context_counters_32x32[BLOCK_TYPES];
extern vp9_coeff_stats tree_update_hist_4x4[BLOCK_TYPES];
extern vp9_coeff_stats tree_update_hist_8x8[BLOCK_TYPES];
extern vp9_coeff_stats tree_update_hist_16x16[BLOCK_TYPES];
extern vp9_coeff_stats tree_update_hist_32x32[BLOCK_TYPES];
#endif /* ENTROPY_STATS */
static TOKENVALUE dct_value_tokens[DCT_MAX_VALUE * 2];
const TOKENVALUE *vp9_dct_value_tokens_ptr;
static int dct_value_cost[DCT_MAX_VALUE * 2];
const int *vp9_dct_value_cost_ptr;
static void fill_value_tokens() {
TOKENVALUE *const t = dct_value_tokens + DCT_MAX_VALUE;
vp9_extra_bit *const e = vp9_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;
vp9_extra_bit *p = vp9_extra_bits + t[i].token;
if (p->base_val) {
const int extra = t[i].extra;
const int length = p->len;
if (length)
cost += treed_cost(p->tree, p->prob, extra >> 1, length);
cost += vp9_cost_bit(vp9_prob_half, extra & 1); /* sign */
dct_value_cost[i + DCT_MAX_VALUE] = cost;
}
}
} while (++i < DCT_MAX_VALUE);
vp9_dct_value_tokens_ptr = dct_value_tokens + DCT_MAX_VALUE;
vp9_dct_value_cost_ptr = dct_value_cost + DCT_MAX_VALUE;
}
extern const int *vp9_get_coef_neighbors_handle(const int *scan, int *pad);
struct tokenize_b_args {
VP9_COMP *cpi;
MACROBLOCKD *xd;
TOKENEXTRA **tp;
TX_SIZE tx_size;
int dry_run;
};
static void tokenize_b(int plane, int block, BLOCK_SIZE_TYPE bsize,
int ss_txfrm_size, void *arg) {
struct tokenize_b_args* const args = arg;
VP9_COMP *cpi = args->cpi;
MACROBLOCKD *xd = args->xd;
TOKENEXTRA **tp = args->tp;
PLANE_TYPE type = plane ? PLANE_TYPE_UV : PLANE_TYPE_Y_WITH_DC;
TX_SIZE tx_size = ss_txfrm_size / 2;
int dry_run = args->dry_run;
MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
int pt; /* near block/prev token context index */
int c = 0, rc = 0;
TOKENEXTRA *t = *tp; /* store tokens starting here */
const int eob = xd->plane[plane].eobs[block];
const int16_t *qcoeff_ptr = BLOCK_OFFSET(xd->plane[plane].qcoeff, block, 16);
const BLOCK_SIZE_TYPE sb_type = mbmi->sb_type;
const int bwl = b_width_log2(sb_type);
const int off = block >> (2 * tx_size);
const int mod = bwl - tx_size - xd->plane[plane].subsampling_x;
const int aoff = (off & ((1 << mod) - 1)) << tx_size;
const int loff = (off >> mod) << tx_size;
ENTROPY_CONTEXT *A = xd->plane[plane].above_context + aoff;
ENTROPY_CONTEXT *L = xd->plane[plane].left_context + loff;
int seg_eob, default_eob, pad;
const int segment_id = mbmi->segment_id;
const int *scan, *nb;
vp9_coeff_count *counts;
vp9_coeff_probs *coef_probs;
const int ref = mbmi->ref_frame != INTRA_FRAME;
ENTROPY_CONTEXT above_ec, left_ec;
uint8_t token_cache[1024];
TX_TYPE tx_type = DCT_DCT;
#if CONFIG_CODE_ZEROGROUP
int last_nz_pos[3] = {-1, -1, -1}; // Encoder only
int is_eoo_list[3] = {0, 0, 0};
int is_last_zero[3] = {0, 0, 0};
int is_eoo_negative[3] = {0, 0, 0};
int o;
vp9_zpc_probs *zpc_probs;
vp9_zpc_count *zpc_count;
uint8_t token_cache_full[1024];
#endif
#if CONFIG_CODE_ZEROGROUP
vpx_memset(token_cache, UNKNOWN_TOKEN, sizeof(token_cache));
#endif
assert((!type && !plane) || (type && plane));
switch (tx_size) {
default:
case TX_4X4: {
tx_type = (type == PLANE_TYPE_Y_WITH_DC) ?
get_tx_type_4x4(xd, block) : DCT_DCT;
above_ec = A[0] != 0;
left_ec = L[0] != 0;
seg_eob = 16;
scan = get_scan_4x4(tx_type);
counts = cpi->coef_counts_4x4;
coef_probs = cpi->common.fc.coef_probs_4x4;
#if CONFIG_CODE_ZEROGROUP
zpc_count = &cpi->common.fc.zpc_counts_4x4;
zpc_probs = &cpi->common.fc.zpc_probs_4x4;
#endif
break;
}
case TX_8X8: {
const int sz = 1 + b_width_log2(sb_type);
const int x = block & ((1 << sz) - 1), y = block - x;
tx_type = (type == PLANE_TYPE_Y_WITH_DC) ?
get_tx_type_8x8(xd, y + (x >> 1)) : DCT_DCT;
above_ec = (A[0] + A[1]) != 0;
left_ec = (L[0] + L[1]) != 0;
seg_eob = 64;
scan = get_scan_8x8(tx_type);
counts = cpi->coef_counts_8x8;
coef_probs = cpi->common.fc.coef_probs_8x8;
#if CONFIG_CODE_ZEROGROUP
zpc_count = &cpi->common.fc.zpc_counts_8x8;
zpc_probs = &cpi->common.fc.zpc_probs_8x8;
#endif
break;
}
case TX_16X16: {
const int sz = 2 + b_width_log2(sb_type);
const int x = block & ((1 << sz) - 1), y = block - x;
tx_type = (type == PLANE_TYPE_Y_WITH_DC) ?
get_tx_type_16x16(xd, y + (x >> 2)) : DCT_DCT;
above_ec = (A[0] + A[1] + A[2] + A[3]) != 0;
left_ec = (L[0] + L[1] + L[2] + L[3]) != 0;
seg_eob = 256;
scan = get_scan_16x16(tx_type);
counts = cpi->coef_counts_16x16;
coef_probs = cpi->common.fc.coef_probs_16x16;
#if CONFIG_CODE_ZEROGROUP
zpc_count = &cpi->common.fc.zpc_counts_16x16;
zpc_probs = &cpi->common.fc.zpc_probs_16x16;
#endif
break;
}
case TX_32X32:
above_ec = (A[0] + A[1] + A[2] + A[3] + A[4] + A[5] + A[6] + A[7]) != 0;
left_ec = (L[0] + L[1] + L[2] + L[3] + L[4] + L[5] + L[6] + L[7]) != 0;
seg_eob = 1024;
scan = vp9_default_zig_zag1d_32x32;
counts = cpi->coef_counts_32x32;
coef_probs = cpi->common.fc.coef_probs_32x32;
#if CONFIG_CODE_ZEROGROUP
zpc_count = &cpi->common.fc.zpc_counts_32x32;
zpc_probs = &cpi->common.fc.zpc_probs_32x32;
#endif
break;
}
pt = combine_entropy_contexts(above_ec, left_ec);
nb = vp9_get_coef_neighbors_handle(scan, &pad);
default_eob = seg_eob;
if (vp9_segfeature_active(xd, segment_id, SEG_LVL_SKIP))
seg_eob = 0;
#if CONFIG_CODE_ZEROGROUP
vpx_memset(token_cache_full, ZERO_TOKEN, sizeof(token_cache_full));
for (c = 0; c < eob; ++c) {
rc = scan[c];
token_cache_full[rc] = vp9_dct_value_tokens_ptr[qcoeff_ptr[rc]].token;
o = vp9_get_orientation(rc, tx_size);
if (qcoeff_ptr[rc] != 0) {
last_nz_pos[o] = c;
}
}
#endif
c = 0;
do {
const int band = get_coef_band(scan, tx_size, c);
int token;
int v = 0;
rc = scan[c];
if (c)
pt = vp9_get_coef_context(scan, nb, pad, token_cache, c, default_eob);
if (c < eob) {
v = qcoeff_ptr[rc];
assert(-DCT_MAX_VALUE <= v && v < DCT_MAX_VALUE);
t->extra = vp9_dct_value_tokens_ptr[v].extra;
token = vp9_dct_value_tokens_ptr[v].token;
} else {
token = DCT_EOB_TOKEN;
}
t->token = token;
t->context_tree = coef_probs[type][ref][band][pt];
t->skip_eob_node = (c > 0) && (token_cache[scan[c - 1]] == 0);
assert(vp9_coef_encodings[t->token].len - t->skip_eob_node > 0);
#if CONFIG_CODE_ZEROGROUP
o = vp9_get_orientation(rc, tx_size);
t->skip_coef_val = (token_cache[rc] == ZERO_TOKEN || is_eoo_list[o]);
if (t->skip_coef_val) {
assert(v == 0);
}
// No need to transmit any token
if (t->skip_eob_node && t->skip_coef_val) {
assert(token == ZERO_TOKEN);
is_last_zero[o] = 1;
token_cache[scan[c]] = ZERO_TOKEN;
continue;
}
#endif
if (!dry_run) {
++counts[type][ref][band][pt][token];
if (!t->skip_eob_node)
++cpi->common.fc.eob_branch_counts[tx_size][type][ref][band][pt];
}
token_cache[scan[c]] = token;
#if CONFIG_CODE_ZEROGROUP
if (token == ZERO_TOKEN && !t->skip_coef_val) {
int eoo = 0, use_eoo;
#if USE_ZPC_EOORIENT == 1
use_eoo = vp9_use_eoo(c, seg_eob, scan, tx_size,
is_last_zero, is_eoo_list);
#else
use_eoo = 0;
#endif
if (use_eoo) {
eoo = vp9_is_eoo(c, eob, scan, tx_size, qcoeff_ptr, last_nz_pos);
if (eoo && is_eoo_negative[o]) eoo = 0;
if (eoo) {
int c_;
int savings = 0;
int zsaved = 0;
savings =
vp9_cost_bit((*zpc_probs)[ref]
[coef_to_zpc_band(band)]
[coef_to_zpc_ptok(pt)][0], 1) -
vp9_cost_bit((*zpc_probs)[ref]
[coef_to_zpc_band(band)]
[coef_to_zpc_ptok(pt)][0], 0);
for (c_ = c + 1; c_ < eob; ++c_) {
if (o == vp9_get_orientation(scan[c_], tx_size)) {
int pt_ = vp9_get_coef_context(scan, nb, pad, token_cache_full,
c_, default_eob);
int band_ = get_coef_band(scan, tx_size, c_);
assert(token_cache_full[scan[c_]] == ZERO_TOKEN);
if (!c_ || token_cache_full[scan[c_ - 1]])
savings +=
vp9_cost_bit(coef_probs[type][ref][band_][pt_][0], 1);
savings += vp9_cost_bit(coef_probs[type][ref][band_][pt_][1], 0);
zsaved++;
}
}
/*
if (!dry_run)
if (savings > 0)
printf("savings %d zsaved %d (%d, %d)\n",
savings, zsaved, tx_size, band);
*/
if (savings < 0) {
eoo = 0;
is_eoo_negative[o] = 1;
}
}
}
if (use_eoo) {
t++;
t->skip_eob_node = t->skip_coef_val = 0;
// transmit the eoo symbol
t->token = !eoo ? ZPC_ISOLATED : ZPC_EOORIENT;
t->context_tree = &((*zpc_probs)[ref]
[coef_to_zpc_band(band)]
[coef_to_zpc_ptok(pt)][0]);
if (!dry_run)
(*zpc_count)[ref]
[coef_to_zpc_band(band)]
[coef_to_zpc_ptok(pt)][0][!eoo]++;
if (eoo) {
assert(is_eoo_list[o] == 0);
is_eoo_list[o] = 1;
}
}
}
is_last_zero[o] = (token == ZERO_TOKEN);
#endif
++t;
} while (c < eob && ++c < seg_eob);
*tp = t;
for (pt = 0; pt < (1 << tx_size); pt++) {
A[pt] = L[pt] = c > 0;
}
}
struct is_skippable_args {
MACROBLOCKD *xd;
int *skippable;
};
static void is_skippable(int plane, int block,
BLOCK_SIZE_TYPE bsize, int ss_txfrm_size, void *argv) {
struct is_skippable_args *args = argv;
args->skippable[0] &= (!args->xd->plane[plane].eobs[block]);
}
int vp9_sb_is_skippable(MACROBLOCKD *xd, BLOCK_SIZE_TYPE bsize) {
int result = 1;
struct is_skippable_args args = {xd, &result};
foreach_transformed_block(xd, bsize, is_skippable, &args);
return result;
}
int vp9_sby_is_skippable(MACROBLOCKD *xd, BLOCK_SIZE_TYPE bsize) {
int result = 1;
struct is_skippable_args args = {xd, &result};
foreach_transformed_block_in_plane(xd, bsize, 0,
#if !CONFIG_SB8X8
0,
#endif
is_skippable, &args);
return result;
}
int vp9_sbuv_is_skippable(MACROBLOCKD *xd, BLOCK_SIZE_TYPE bsize) {
int result = 1;
struct is_skippable_args args = {xd, &result};
foreach_transformed_block_uv(xd, bsize, is_skippable, &args);
return result;
}
void vp9_tokenize_sb(VP9_COMP *cpi,
MACROBLOCKD *xd,
TOKENEXTRA **t,
int dry_run, BLOCK_SIZE_TYPE bsize) {
VP9_COMMON * const cm = &cpi->common;
MB_MODE_INFO * const mbmi = &xd->mode_info_context->mbmi;
TOKENEXTRA *t_backup = *t;
const int mb_skip_context = vp9_get_pred_context(cm, xd, PRED_MBSKIP);
const int segment_id = mbmi->segment_id;
const int skip_inc = !vp9_segfeature_active(xd, segment_id, SEG_LVL_SKIP);
const TX_SIZE txfm_size = mbmi->txfm_size;
struct tokenize_b_args arg = {
cpi, xd, t, txfm_size, dry_run
};
mbmi->mb_skip_coeff = vp9_sb_is_skippable(xd, bsize);
if (mbmi->mb_skip_coeff) {
if (!dry_run)
cpi->skip_true_count[mb_skip_context] += skip_inc;
vp9_reset_sb_tokens_context(xd, bsize);
if (dry_run)
*t = t_backup;
return;
}
if (!dry_run)
cpi->skip_false_count[mb_skip_context] += skip_inc;
foreach_transformed_block(xd, bsize, tokenize_b, &arg);
if (dry_run)
*t = t_backup;
}
#ifdef ENTROPY_STATS
void init_context_counters(void) {
FILE *f = fopen("context.bin", "rb");
if (!f) {
vpx_memset(context_counters_4x4, 0, sizeof(context_counters_4x4));
vpx_memset(context_counters_8x8, 0, sizeof(context_counters_8x8));
vpx_memset(context_counters_16x16, 0, sizeof(context_counters_16x16));
vpx_memset(context_counters_32x32, 0, sizeof(context_counters_32x32));
} else {
fread(context_counters_4x4, sizeof(context_counters_4x4), 1, f);
fread(context_counters_8x8, sizeof(context_counters_8x8), 1, f);
fread(context_counters_16x16, sizeof(context_counters_16x16), 1, f);
fread(context_counters_32x32, sizeof(context_counters_32x32), 1, f);
fclose(f);
}
f = fopen("treeupdate.bin", "rb");
if (!f) {
vpx_memset(tree_update_hist_4x4, 0, sizeof(tree_update_hist_4x4));
vpx_memset(tree_update_hist_8x8, 0, sizeof(tree_update_hist_8x8));
vpx_memset(tree_update_hist_16x16, 0, sizeof(tree_update_hist_16x16));
vpx_memset(tree_update_hist_32x32, 0, sizeof(tree_update_hist_32x32));
} else {
fread(tree_update_hist_4x4, sizeof(tree_update_hist_4x4), 1, f);
fread(tree_update_hist_8x8, sizeof(tree_update_hist_8x8), 1, f);
fread(tree_update_hist_16x16, sizeof(tree_update_hist_16x16), 1, f);
fread(tree_update_hist_32x32, sizeof(tree_update_hist_32x32), 1, f);
fclose(f);
}
}
static void print_counter(FILE *f, vp9_coeff_accum *context_counters,
int block_types, const char *header) {
int type, ref, band, pt, t;
fprintf(f, "static const vp9_coeff_count %s = {\n", header);
#define Comma(X) (X ? "," : "")
type = 0;
do {
ref = 0;
fprintf(f, "%s\n { /* block Type %d */", Comma(type), type);
do {
fprintf(f, "%s\n { /* %s */", Comma(type), ref ? "Inter" : "Intra");
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_t x = context_counters[type][ref][band][pt][t];
const int y = (int) x;
assert(x == (int64_t) y); /* no overflow handling yet */
fprintf(f, "%s %d", Comma(t), y);
} while (++t < 1 + MAX_ENTROPY_TOKENS);
fprintf(f, "}");
} while (++pt < PREV_COEF_CONTEXTS);
fprintf(f, "\n }");
} while (++band < COEF_BANDS);
fprintf(f, "\n }");
} while (++ref < REF_TYPES);
fprintf(f, "\n }");
} while (++type < block_types);
fprintf(f, "\n};\n");
}
static void print_probs(FILE *f, vp9_coeff_accum *context_counters,
int block_types, const char *header) {
int type, ref, band, pt, t;
fprintf(f, "static const vp9_coeff_probs %s = {", header);
type = 0;
#define Newline(x, spaces) (x ? " " : "\n" spaces)
do {
fprintf(f, "%s%s{ /* block Type %d */",
Comma(type), Newline(type, " "), type);
ref = 0;
do {
fprintf(f, "%s%s{ /* %s */",
Comma(band), Newline(band, " "), ref ? "Inter" : "Intra");
band = 0;
do {
fprintf(f, "%s%s{ /* Coeff Band %d */",
Comma(band), Newline(band, " "), band);
pt = 0;
do {
unsigned int branch_ct[ENTROPY_NODES][2];
unsigned int coef_counts[MAX_ENTROPY_TOKENS + 1];
vp9_prob coef_probs[ENTROPY_NODES];
if (pt >= 3 && band == 0)
break;
for (t = 0; t < MAX_ENTROPY_TOKENS + 1; ++t)
coef_counts[t] = context_counters[type][ref][band][pt][t];
vp9_tree_probs_from_distribution(vp9_coef_tree, coef_probs,
branch_ct, coef_counts, 0);
branch_ct[0][1] = coef_counts[MAX_ENTROPY_TOKENS] - branch_ct[0][0];
coef_probs[0] = get_binary_prob(branch_ct[0][0], branch_ct[0][1]);
fprintf(f, "%s\n {", Comma(pt));
t = 0;
do {
fprintf(f, "%s %3d", Comma(t), coef_probs[t]);
} while (++t < ENTROPY_NODES);
fprintf(f, " }");
} while (++pt < PREV_COEF_CONTEXTS);
fprintf(f, "\n }");
} while (++band < COEF_BANDS);
fprintf(f, "\n }");
} while (++ref < REF_TYPES);
fprintf(f, "\n }");
} while (++type < block_types);
fprintf(f, "\n};\n");
}
void print_context_counters() {
FILE *f = fopen("vp9_context.c", "w");
fprintf(f, "#include \"vp9_entropy.h\"\n");
fprintf(f, "\n/* *** GENERATED FILE: DO NOT EDIT *** */\n\n");
/* print counts */
print_counter(f, context_counters_4x4, BLOCK_TYPES,
"vp9_default_coef_counts_4x4[BLOCK_TYPES]");
print_counter(f, context_counters_8x8, BLOCK_TYPES,
"vp9_default_coef_counts_8x8[BLOCK_TYPES]");
print_counter(f, context_counters_16x16, BLOCK_TYPES,
"vp9_default_coef_counts_16x16[BLOCK_TYPES]");
print_counter(f, context_counters_32x32, BLOCK_TYPES,
"vp9_default_coef_counts_32x32[BLOCK_TYPES]");
/* print coefficient probabilities */
print_probs(f, context_counters_4x4, BLOCK_TYPES,
"default_coef_probs_4x4[BLOCK_TYPES]");
print_probs(f, context_counters_8x8, BLOCK_TYPES,
"default_coef_probs_8x8[BLOCK_TYPES]");
print_probs(f, context_counters_16x16, BLOCK_TYPES,
"default_coef_probs_16x16[BLOCK_TYPES]");
print_probs(f, context_counters_32x32, BLOCK_TYPES,
"default_coef_probs_32x32[BLOCK_TYPES]");
fclose(f);
f = fopen("context.bin", "wb");
fwrite(context_counters_4x4, sizeof(context_counters_4x4), 1, f);
fwrite(context_counters_8x8, sizeof(context_counters_8x8), 1, f);
fwrite(context_counters_16x16, sizeof(context_counters_16x16), 1, f);
fwrite(context_counters_32x32, sizeof(context_counters_32x32), 1, f);
fclose(f);
}
#endif
void vp9_tokenize_initialize() {
fill_value_tokens();
}