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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 <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aom/aom_integer.h"
#include "av1/decoder/accounting.h"
static int accounting_hash(const char *str) {
uint32_t val;
const unsigned char *ustr;
val = 0;
ustr = (const unsigned char *)str;
/* This is about the worst hash one can design, but it should be good enough
here. */
while (*ustr) val += *ustr++;
return val % AOM_ACCOUNTING_HASH_SIZE;
}
/* Dictionary lookup based on an open-addressing hash table. */
int aom_accounting_dictionary_lookup(Accounting *accounting, const char *str) {
int hash;
size_t len;
AccountingDictionary *dictionary;
dictionary = &accounting->syms.dictionary;
hash = accounting_hash(str);
while (accounting->hash_dictionary[hash] != -1) {
if (strcmp(dictionary->strs[accounting->hash_dictionary[hash]], str) == 0) {
return accounting->hash_dictionary[hash];
}
hash++;
if (hash == AOM_ACCOUNTING_HASH_SIZE) hash = 0;
}
/* No match found. */
assert(dictionary->num_strs + 1 < MAX_SYMBOL_TYPES);
accounting->hash_dictionary[hash] = dictionary->num_strs;
len = strlen(str);
dictionary->strs[dictionary->num_strs] = malloc(len + 1);
if (!dictionary->strs[dictionary->num_strs]) abort();
snprintf(dictionary->strs[dictionary->num_strs], len + 1, "%s", str);
dictionary->num_strs++;
return dictionary->num_strs - 1;
}
void aom_accounting_init(Accounting *accounting) {
int i;
accounting->num_syms_allocated = 1000;
accounting->syms.syms =
malloc(sizeof(AccountingSymbol) * accounting->num_syms_allocated);
if (!accounting->syms.syms) abort();
accounting->syms.dictionary.num_strs = 0;
assert(AOM_ACCOUNTING_HASH_SIZE > 2 * MAX_SYMBOL_TYPES);
for (i = 0; i < AOM_ACCOUNTING_HASH_SIZE; i++)
accounting->hash_dictionary[i] = -1;
aom_accounting_reset(accounting);
}
void aom_accounting_reset(Accounting *accounting) {
accounting->syms.num_syms = 0;
accounting->syms.num_binary_syms = 0;
accounting->syms.num_multi_syms = 0;
accounting->context.x = -1;
accounting->context.y = -1;
accounting->last_tell_frac = 0;
}
void aom_accounting_clear(Accounting *accounting) {
int i;
AccountingDictionary *dictionary;
free(accounting->syms.syms);
dictionary = &accounting->syms.dictionary;
for (i = 0; i < dictionary->num_strs; i++) {
free(dictionary->strs[i]);
}
}
void aom_accounting_set_context(Accounting *accounting, int16_t x, int16_t y) {
accounting->context.x = x;
accounting->context.y = y;
}
void aom_accounting_record(Accounting *accounting, const char *str,
uint32_t bits) {
AccountingSymbol sym;
// Reuse previous symbol if it has the same context and symbol id.
if (accounting->syms.num_syms) {
AccountingSymbol *last_sym;
last_sym = &accounting->syms.syms[accounting->syms.num_syms - 1];
if (memcmp(&last_sym->context, &accounting->context,
sizeof(AccountingSymbolContext)) == 0) {
uint32_t id;
id = aom_accounting_dictionary_lookup(accounting, str);
if (id == last_sym->id) {
last_sym->bits += bits;
last_sym->samples++;
return;
}
}
}
sym.context = accounting->context;
sym.samples = 1;
sym.bits = bits;
sym.id = aom_accounting_dictionary_lookup(accounting, str);
assert(sym.id <= 255);
if (accounting->syms.num_syms == accounting->num_syms_allocated) {
accounting->num_syms_allocated *= 2;
accounting->syms.syms =
realloc(accounting->syms.syms,
sizeof(AccountingSymbol) * accounting->num_syms_allocated);
if (!accounting->syms.syms) abort();
}
accounting->syms.syms[accounting->syms.num_syms++] = sym;
}
void aom_accounting_dump(Accounting *accounting) {
int i;
AccountingSymbol *sym;
printf("\n----- Number of recorded syntax elements = %d -----\n",
accounting->syms.num_syms);
printf("----- Total number of symbol calls = %d (%d binary) -----\n",
accounting->syms.num_multi_syms + accounting->syms.num_binary_syms,
accounting->syms.num_binary_syms);
for (i = 0; i < accounting->syms.num_syms; i++) {
sym = &accounting->syms.syms[i];
printf("%s x: %d, y: %d bits: %f samples: %d\n",
accounting->syms.dictionary.strs[sym->id], sym->context.x,
sym->context.y, (float)sym->bits / 8.0, sym->samples);
}
}
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