mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-27 04:05:32 +00:00
a6f10c9181
Differential Revision: https://phabricator.services.mozilla.com/D6206 --HG-- rename : third_party/aom/aom_ports/ppc.h => third_party/aom/aom_dsp/x86/sum_squares_sse2.h rename : third_party/aom/av1/decoder/obu.h => third_party/aom/av1/common/obu_util.h rename : third_party/aom/build/make/ios-Info.plist => third_party/aom/build/cmake/ios-Info.plist rename : third_party/aom/build/make/iosbuild.sh => third_party/aom/build/cmake/iosbuild.sh rename : third_party/aom/build/make/rtcd.pl => third_party/aom/build/cmake/rtcd.pl rename : third_party/aom/common/y4menc.h => third_party/aom/common/rawenc.h extra : moz-landing-system : lando
124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/*
|
|
* Copyright (c) 2017, 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 "aom_dsp/binary_codes_reader.h"
|
|
|
|
#include "av1/common/common.h"
|
|
|
|
// Inverse recenters a non-negative literal v around a reference r
|
|
static uint16_t inv_recenter_nonneg(uint16_t r, uint16_t v) {
|
|
if (v > (r << 1))
|
|
return v;
|
|
else if ((v & 1) == 0)
|
|
return (v >> 1) + r;
|
|
else
|
|
return r - ((v + 1) >> 1);
|
|
}
|
|
|
|
// Inverse recenters a non-negative literal v in [0, n-1] around a
|
|
// reference r also in [0, n-1]
|
|
static uint16_t inv_recenter_finite_nonneg(uint16_t n, uint16_t r, uint16_t v) {
|
|
if ((r << 1) <= n) {
|
|
return inv_recenter_nonneg(r, v);
|
|
} else {
|
|
return n - 1 - inv_recenter_nonneg(n - 1 - r, v);
|
|
}
|
|
}
|
|
|
|
uint16_t aom_read_primitive_quniform_(aom_reader *r,
|
|
uint16_t n ACCT_STR_PARAM) {
|
|
if (n <= 1) return 0;
|
|
const int l = get_msb(n) + 1;
|
|
const int m = (1 << l) - n;
|
|
const int v = aom_read_literal(r, l - 1, ACCT_STR_NAME);
|
|
return v < m ? v : (v << 1) - m + aom_read_bit(r, ACCT_STR_NAME);
|
|
}
|
|
|
|
static uint16_t aom_rb_read_primitive_quniform(struct aom_read_bit_buffer *rb,
|
|
uint16_t n) {
|
|
if (n <= 1) return 0;
|
|
const int l = get_msb(n) + 1;
|
|
const int m = (1 << l) - n;
|
|
const int v = aom_rb_read_literal(rb, l - 1);
|
|
return v < m ? v : (v << 1) - m + aom_rb_read_bit(rb);
|
|
}
|
|
|
|
// Decode finite subexponential code that for a symbol v in [0, n-1] with
|
|
// parameter k
|
|
uint16_t aom_read_primitive_subexpfin_(aom_reader *r, uint16_t n,
|
|
uint16_t k ACCT_STR_PARAM) {
|
|
int i = 0;
|
|
int mk = 0;
|
|
|
|
while (1) {
|
|
int b = (i ? k + i - 1 : k);
|
|
int a = (1 << b);
|
|
|
|
if (n <= mk + 3 * a) {
|
|
return aom_read_primitive_quniform(r, n - mk, ACCT_STR_NAME) + mk;
|
|
}
|
|
|
|
if (!aom_read_bit(r, ACCT_STR_NAME)) {
|
|
return aom_read_literal(r, b, ACCT_STR_NAME) + mk;
|
|
}
|
|
|
|
i = i + 1;
|
|
mk += a;
|
|
}
|
|
|
|
assert(0);
|
|
return 0;
|
|
}
|
|
|
|
static uint16_t aom_rb_read_primitive_subexpfin(struct aom_read_bit_buffer *rb,
|
|
uint16_t n, uint16_t k) {
|
|
int i = 0;
|
|
int mk = 0;
|
|
|
|
while (1) {
|
|
int b = (i ? k + i - 1 : k);
|
|
int a = (1 << b);
|
|
|
|
if (n <= mk + 3 * a) {
|
|
return aom_rb_read_primitive_quniform(rb, n - mk) + mk;
|
|
}
|
|
|
|
if (!aom_rb_read_bit(rb)) {
|
|
return aom_rb_read_literal(rb, b) + mk;
|
|
}
|
|
|
|
i = i + 1;
|
|
mk += a;
|
|
}
|
|
|
|
assert(0);
|
|
return 0;
|
|
}
|
|
|
|
uint16_t aom_read_primitive_refsubexpfin_(aom_reader *r, uint16_t n, uint16_t k,
|
|
uint16_t ref ACCT_STR_PARAM) {
|
|
return inv_recenter_finite_nonneg(
|
|
n, ref, aom_read_primitive_subexpfin(r, n, k, ACCT_STR_NAME));
|
|
}
|
|
|
|
static uint16_t aom_rb_read_primitive_refsubexpfin(
|
|
struct aom_read_bit_buffer *rb, uint16_t n, uint16_t k, uint16_t ref) {
|
|
return inv_recenter_finite_nonneg(n, ref,
|
|
aom_rb_read_primitive_subexpfin(rb, n, k));
|
|
}
|
|
|
|
int16_t aom_rb_read_signed_primitive_refsubexpfin(
|
|
struct aom_read_bit_buffer *rb, uint16_t n, uint16_t k, int16_t ref) {
|
|
ref += n - 1;
|
|
const uint16_t scaled_n = (n << 1) - 1;
|
|
return aom_rb_read_primitive_refsubexpfin(rb, scaled_n, k, ref) - n + 1;
|
|
}
|