diff options
Diffstat (limited to 'third_party/aom/aom_dsp/binary_codes_writer.c')
| -rw-r--r-- | third_party/aom/aom_dsp/binary_codes_writer.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/third_party/aom/aom_dsp/binary_codes_writer.c b/third_party/aom/aom_dsp/binary_codes_writer.c deleted file mode 100644 index ee7a9f567..000000000 --- a/third_party/aom/aom_dsp/binary_codes_writer.c +++ /dev/null @@ -1,210 +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/bitwriter.h" -#include "aom_dsp/binary_codes_writer.h" - -#include "av1/common/common.h" - -// Recenters a non-negative literal v around a reference r -static uint16_t recenter_nonneg(uint16_t r, uint16_t v) { - if (v > (r << 1)) - return v; - else if (v >= r) - return ((v - r) << 1); - else - return ((r - v) << 1) - 1; -} - -// Recenters a non-negative literal v in [0, n-1] around a -// reference r also in [0, n-1] -static uint16_t recenter_finite_nonneg(uint16_t n, uint16_t r, uint16_t v) { - if ((r << 1) <= n) { - return recenter_nonneg(r, v); - } else { - return recenter_nonneg(n - 1 - r, n - 1 - v); - } -} - -// Codes a symbol v in [-2^mag_bits, 2^mag_bits]. -// mag_bits is number of bits for magnitude. The alphabet is of size -// 2 * 2^mag_bits + 1, symmetric around 0, where one bit is used to -// indicate 0 or non-zero, mag_bits bits are used to indicate magnitide -// and 1 more bit for the sign if non-zero. -void aom_write_primitive_symmetric(aom_writer *w, int16_t v, - unsigned int abs_bits) { - if (v == 0) { - aom_write_bit(w, 0); - } else { - const int x = abs(v); - const int s = v < 0; - aom_write_bit(w, 1); - aom_write_bit(w, s); - aom_write_literal(w, x - 1, abs_bits); - } -} - -int aom_count_primitive_symmetric(int16_t v, unsigned int abs_bits) { - return (v == 0 ? 1 : abs_bits + 2); -} - -// Encodes a value v in [0, n-1] quasi-uniformly -void aom_write_primitive_quniform(aom_writer *w, uint16_t n, uint16_t v) { - if (n <= 1) return; - const int l = get_msb(n) + 1; - const int m = (1 << l) - n; - if (v < m) { - aom_write_literal(w, v, l - 1); - } else { - aom_write_literal(w, m + ((v - m) >> 1), l - 1); - aom_write_bit(w, (v - m) & 1); - } -} - -static void aom_wb_write_primitive_quniform(struct aom_write_bit_buffer *wb, - uint16_t n, uint16_t v) { - if (n <= 1) return; - const int l = get_msb(n) + 1; - const int m = (1 << l) - n; - if (v < m) { - aom_wb_write_literal(wb, v, l - 1); - } else { - aom_wb_write_literal(wb, m + ((v - m) >> 1), l - 1); - aom_wb_write_bit(wb, (v - m) & 1); - } -} - -int aom_count_primitive_quniform(uint16_t n, uint16_t v) { - if (n <= 1) return 0; - const int l = get_msb(n) + 1; - const int m = (1 << l) - n; - return v < m ? l - 1 : l; -} - -// Finite subexponential code that codes a symbol v in [0, n-1] with parameter k -void aom_write_primitive_subexpfin(aom_writer *w, uint16_t n, uint16_t k, - uint16_t v) { - int i = 0; - int mk = 0; - while (1) { - int b = (i ? k + i - 1 : k); - int a = (1 << b); - if (n <= mk + 3 * a) { - aom_write_primitive_quniform(w, n - mk, v - mk); - break; - } else { - int t = (v >= mk + a); - aom_write_bit(w, t); - if (t) { - i = i + 1; - mk += a; - } else { - aom_write_literal(w, v - mk, b); - break; - } - } - } -} - -static void aom_wb_write_primitive_subexpfin(struct aom_write_bit_buffer *wb, - uint16_t n, uint16_t k, - uint16_t v) { - int i = 0; - int mk = 0; - while (1) { - int b = (i ? k + i - 1 : k); - int a = (1 << b); - if (n <= mk + 3 * a) { - aom_wb_write_primitive_quniform(wb, n - mk, v - mk); - break; - } else { - int t = (v >= mk + a); - aom_wb_write_bit(wb, t); - if (t) { - i = i + 1; - mk += a; - } else { - aom_wb_write_literal(wb, v - mk, b); - break; - } - } - } -} - -int aom_count_primitive_subexpfin(uint16_t n, uint16_t k, uint16_t v) { - int count = 0; - int i = 0; - int mk = 0; - while (1) { - int b = (i ? k + i - 1 : k); - int a = (1 << b); - if (n <= mk + 3 * a) { - count += aom_count_primitive_quniform(n - mk, v - mk); - break; - } else { - int t = (v >= mk + a); - count++; - if (t) { - i = i + 1; - mk += a; - } else { - count += b; - break; - } - } - } - return count; -} - -// Finite subexponential code that codes a symbol v in [0, n-1] with parameter k -// based on a reference ref also in [0, n-1]. -// Recenters symbol around r first and then uses a finite subexponential code. -void aom_write_primitive_refsubexpfin(aom_writer *w, uint16_t n, uint16_t k, - uint16_t ref, uint16_t v) { - aom_write_primitive_subexpfin(w, n, k, recenter_finite_nonneg(n, ref, v)); -} - -static void aom_wb_write_primitive_refsubexpfin(struct aom_write_bit_buffer *wb, - uint16_t n, uint16_t k, - uint16_t ref, uint16_t v) { - aom_wb_write_primitive_subexpfin(wb, n, k, recenter_finite_nonneg(n, ref, v)); -} - -void aom_write_signed_primitive_refsubexpfin(aom_writer *w, uint16_t n, - uint16_t k, int16_t ref, - int16_t v) { - ref += n - 1; - v += n - 1; - const uint16_t scaled_n = (n << 1) - 1; - aom_write_primitive_refsubexpfin(w, scaled_n, k, ref, v); -} - -void aom_wb_write_signed_primitive_refsubexpfin(struct aom_write_bit_buffer *wb, - uint16_t n, uint16_t k, - int16_t ref, int16_t v) { - ref += n - 1; - v += n - 1; - const uint16_t scaled_n = (n << 1) - 1; - aom_wb_write_primitive_refsubexpfin(wb, scaled_n, k, ref, v); -} - -int aom_count_primitive_refsubexpfin(uint16_t n, uint16_t k, uint16_t ref, - uint16_t v) { - return aom_count_primitive_subexpfin(n, k, recenter_finite_nonneg(n, ref, v)); -} - -int aom_count_signed_primitive_refsubexpfin(uint16_t n, uint16_t k, int16_t ref, - int16_t v) { - ref += n - 1; - v += n - 1; - const uint16_t scaled_n = (n << 1) - 1; - return aom_count_primitive_refsubexpfin(scaled_n, k, ref, v); -} |