wuggy/Dactyloidae
wuggy/Dactyloidae
1
0
Fork 0
mirror of https://repo.dactyloidae.xyz/Dactyloidae/UXP.git synced 2026-10-09 16:57:30 +09:00
Code Issues Projects Releases Packages Wiki Activity

Import aom library

Browse source 
This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.
This commit is contained in:
trav90 2018-10-15 21:45:30 -05:00 • committed by Roy Tam
commit edc8d83307
989 changed files with 470949 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

107
third_party/aom/av1/encoder/laplace_encoder.c vendored Normal file
View file

@ -0,0 +1,107 @@
/*
* Copyright (c) 2001-2016, 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.
*/
/* clang-format off */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include "aom_dsp/bitwriter.h"
#include "av1/common/odintrin.h"
#include "av1/common/pvq.h"
#include "pvq_encoder.h"
static void aom_encode_pvq_split(aom_writer *w, od_pvq_codeword_ctx *adapt,
int count, int sum, int ctx) {
int shift;
int rest;
int fctx;
if (sum == 0) return;
shift = OD_MAXI(0, OD_ILOG(sum) - 3);
if (shift) {
rest = count & ((1 << shift) - 1);
count >>= shift;
sum >>= shift;
}
fctx = 7*ctx + sum - 1;
aom_write_symbol_pvq(w, count, adapt->pvq_split_cdf[fctx], sum + 1);
if (shift) aom_write_literal(w, rest, shift);
}
void aom_encode_band_pvq_splits(aom_writer *w, od_pvq_codeword_ctx *adapt,
const int *y, int n, int k, int level) {
int mid;
int i;
int count_right;
if (n <= 1 || k == 0) return;
if (k == 1 && n <= 16) {
int cdf_id;
int pos;
cdf_id = od_pvq_k1_ctx(n, level == 0);
for (pos = 0; !y[pos]; pos++);
OD_ASSERT(pos < n);
aom_write_symbol_pvq(w, pos, adapt->pvq_k1_cdf[cdf_id], n);
}
else {
mid = n >> 1;
count_right = k;
for (i = 0; i < mid; i++) count_right -= abs(y[i]);
aom_encode_pvq_split(w, adapt, count_right, k, od_pvq_size_ctx(n));
aom_encode_band_pvq_splits(w, adapt, y, mid, k - count_right, level + 1);
aom_encode_band_pvq_splits(w, adapt, y + mid, n - mid, count_right,
level + 1);
}
}
/** Encodes the tail of a Laplace-distributed variable, i.e. it doesn't
* do anything special for the zero case.
*
* @param [in,out] enc range encoder
* @param [in] x variable to encode (has to be positive)
* @param [in] decay decay factor of the distribution in Q8 format,
* i.e. pdf ~= decay^x
*/
void aom_laplace_encode_special(aom_writer *w, int x, unsigned decay) {
int shift;
int xs;
int sym;
const uint16_t *cdf;
shift = 0;
/* We don't want a large decay value because that would require too many
symbols. */
while (decay > 235) {
decay = (decay*decay + 128) >> 8;
shift++;
}
decay = OD_MINI(decay, 254);
decay = OD_MAXI(decay, 2);
xs = x >> shift;
cdf = EXP_CDF_TABLE[(decay + 1) >> 1];
OD_LOG((OD_LOG_PVQ, OD_LOG_DEBUG, "decay = %d", decay));
do {
sym = OD_MINI(xs, 15);
{
int i;
OD_LOG((OD_LOG_PVQ, OD_LOG_DEBUG, "%d %d %d %d %d\n", x, xs, shift,
sym, max));
for (i = 0; i < 16; i++) {
OD_LOG_PARTIAL((OD_LOG_PVQ, OD_LOG_DEBUG, "%d ", cdf[i]));
}
OD_LOG_PARTIAL((OD_LOG_PVQ, OD_LOG_DEBUG, "\n"));
}
aom_write_cdf(w, sym, cdf, 16);
xs -= 15;
} while (sym >= 15);
if (shift) aom_write_literal(w, x & ((1 << shift) - 1), shift);
}