diff options
author | Matt A. Tobin <email@mattatobin.com> | 2020-04-07 23:30:51 -0400 |
---|---|---|
committer | Matt A. Tobin <email@mattatobin.com> | 2020-04-07 23:30:51 -0400 |
commit | 5545a8983ff0ef1fb52e64aef8e66fa9b13c1cbb (patch) | |
tree | 45d55e3e5e73c4255c4d71258d9be5b2d004d28f /third_party/aom/aom_dsp/binary_codes_reader.c | |
parent | 50f1986697a7412e4160976fa5e11217b4ef1f44 (diff) | |
download | UXP-5545a8983ff0ef1fb52e64aef8e66fa9b13c1cbb.tar UXP-5545a8983ff0ef1fb52e64aef8e66fa9b13c1cbb.tar.gz UXP-5545a8983ff0ef1fb52e64aef8e66fa9b13c1cbb.tar.lz UXP-5545a8983ff0ef1fb52e64aef8e66fa9b13c1cbb.tar.xz UXP-5545a8983ff0ef1fb52e64aef8e66fa9b13c1cbb.zip |
Move aom source to a sub-directory under media/libaom
There is no damned reason to treat this differently than any other media lib given its license and there never was.
Diffstat (limited to 'third_party/aom/aom_dsp/binary_codes_reader.c')
-rw-r--r-- | third_party/aom/aom_dsp/binary_codes_reader.c | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/third_party/aom/aom_dsp/binary_codes_reader.c b/third_party/aom/aom_dsp/binary_codes_reader.c deleted file mode 100644 index 01088010a..000000000 --- a/third_party/aom/aom_dsp/binary_codes_reader.c +++ /dev/null @@ -1,123 +0,0 @@ -/* - * 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; -} |