mirror of
https://github.com/FFmpeg/FFmpeg.git
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363 lines
11 KiB
C
363 lines
11 KiB
C
/*
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* Copyright (C) 2016 foo86
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/common.h"
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#include "dcadct.h"
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#include "dcamath.h"
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static void sum_a(const int *input, int *output, int len)
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{
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int i;
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for (i = 0; i < len; i++)
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output[i] = input[2 * i] + input[2 * i + 1];
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}
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static void sum_b(const int *input, int *output, int len)
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{
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int i;
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output[0] = input[0];
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for (i = 1; i < len; i++)
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output[i] = input[2 * i] + input[2 * i - 1];
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}
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static void sum_c(const int *input, int *output, int len)
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{
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int i;
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for (i = 0; i < len; i++)
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output[i] = input[2 * i];
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}
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static void sum_d(const int *input, int *output, int len)
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{
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int i;
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output[0] = input[1];
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for (i = 1; i < len; i++)
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output[i] = input[2 * i - 1] + input[2 * i + 1];
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}
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static void dct_a(const int *input, int *output)
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{
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static const int cos_mod[8][8] = {
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{ 8348215, 8027397, 7398092, 6484482, 5321677, 3954362, 2435084, 822227 },
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{ 8027397, 5321677, 822227, -3954362, -7398092, -8348215, -6484482, -2435084 },
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{ 7398092, 822227, -6484482, -8027397, -2435084, 5321677, 8348215, 3954362 },
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{ 6484482, -3954362, -8027397, 822227, 8348215, 2435084, -7398092, -5321677 },
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{ 5321677, -7398092, -2435084, 8348215, -822227, -8027397, 3954362, 6484482 },
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{ 3954362, -8348215, 5321677, 2435084, -8027397, 6484482, 822227, -7398092 },
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{ 2435084, -6484482, 8348215, -7398092, 3954362, 822227, -5321677, 8027397 },
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{ 822227, -2435084, 3954362, -5321677, 6484482, -7398092, 8027397, -8348215 }
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};
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int i, j;
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for (i = 0; i < 8; i++) {
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int64_t res = 0;
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for (j = 0; j < 8; j++)
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res += (int64_t)cos_mod[i][j] * input[j];
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output[i] = norm23(res);
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}
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}
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static void dct_b(const int *input, int *output)
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{
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static const int cos_mod[8][7] = {
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{ 8227423, 7750063, 6974873, 5931642, 4660461, 3210181, 1636536 },
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{ 6974873, 3210181, -1636536, -5931642, -8227423, -7750063, -4660461 },
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{ 4660461, -3210181, -8227423, -5931642, 1636536, 7750063, 6974873 },
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{ 1636536, -7750063, -4660461, 5931642, 6974873, -3210181, -8227423 },
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{ -1636536, -7750063, 4660461, 5931642, -6974873, -3210181, 8227423 },
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{ -4660461, -3210181, 8227423, -5931642, -1636536, 7750063, -6974873 },
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{ -6974873, 3210181, 1636536, -5931642, 8227423, -7750063, 4660461 },
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{ -8227423, 7750063, -6974873, 5931642, -4660461, 3210181, -1636536 }
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};
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int i, j;
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for (i = 0; i < 8; i++) {
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int64_t res = input[0] * (INT64_C(1) << 23);
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for (j = 0; j < 7; j++)
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res += (int64_t)cos_mod[i][j] * input[1 + j];
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output[i] = norm23(res);
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}
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}
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static void mod_a(const int *input, int *output)
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{
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static const int cos_mod[16] = {
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4199362, 4240198, 4323885, 4454708,
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4639772, 4890013, 5221943, 5660703,
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-6245623, -7040975, -8158494, -9809974,
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-12450076, -17261920, -28585092, -85479984
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};
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int i, k;
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for (i = 0; i < 8; i++)
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output[i] = mul23(cos_mod[i], input[i] + input[8 + i]);
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for (i = 8, k = 7; i < 16; i++, k--)
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output[i] = mul23(cos_mod[i], input[k] - input[8 + k]);
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}
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static void mod_b(int *input, int *output)
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{
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static const int cos_mod[8] = {
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4214598, 4383036, 4755871, 5425934,
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6611520, 8897610, 14448934, 42791536
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};
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int i, k;
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for (i = 0; i < 8; i++)
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input[8 + i] = mul23(cos_mod[i], input[8 + i]);
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for (i = 0; i < 8; i++)
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output[i] = input[i] + input[8 + i];
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for (i = 8, k = 7; i < 16; i++, k--)
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output[i] = input[k] - input[8 + k];
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}
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static void mod_c(const int *input, int *output)
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{
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static const int cos_mod[32] = {
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1048892, 1051425, 1056522, 1064244,
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1074689, 1087987, 1104313, 1123884,
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1146975, 1173922, 1205139, 1241133,
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1282529, 1330095, 1384791, 1447815,
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-1520688, -1605358, -1704360, -1821051,
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-1959964, -2127368, -2332183, -2587535,
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-2913561, -3342802, -3931480, -4785806,
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-6133390, -8566050, -14253820, -42727120
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};
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int i, k;
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for (i = 0; i < 16; i++)
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output[i] = mul23(cos_mod[i], input[i] + input[16 + i]);
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for (i = 16, k = 15; i < 32; i++, k--)
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output[i] = mul23(cos_mod[i], input[k] - input[16 + k]);
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}
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static void clp_v(int *input, int len)
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{
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int i;
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for (i = 0; i < len; i++)
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input[i] = clip23(input[i]);
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}
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static void imdct_half_32(int32_t *output, const int32_t *input)
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{
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int buf_a[32], buf_b[32];
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int i, k, mag, shift, round;
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mag = 0;
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for (i = 0; i < 32; i++)
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mag += abs(input[i]);
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shift = mag > 0x400000 ? 2 : 0;
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round = shift > 0 ? 1 << (shift - 1) : 0;
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for (i = 0; i < 32; i++)
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buf_a[i] = (input[i] + round) >> shift;
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sum_a(buf_a, buf_b + 0, 16);
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sum_b(buf_a, buf_b + 16, 16);
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clp_v(buf_b, 32);
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sum_a(buf_b + 0, buf_a + 0, 8);
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sum_b(buf_b + 0, buf_a + 8, 8);
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sum_c(buf_b + 16, buf_a + 16, 8);
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sum_d(buf_b + 16, buf_a + 24, 8);
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clp_v(buf_a, 32);
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dct_a(buf_a + 0, buf_b + 0);
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dct_b(buf_a + 8, buf_b + 8);
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dct_b(buf_a + 16, buf_b + 16);
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dct_b(buf_a + 24, buf_b + 24);
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clp_v(buf_b, 32);
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mod_a(buf_b + 0, buf_a + 0);
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mod_b(buf_b + 16, buf_a + 16);
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clp_v(buf_a, 32);
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mod_c(buf_a, buf_b);
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for (i = 0; i < 32; i++)
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buf_b[i] = clip23(buf_b[i] * (1 << shift));
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for (i = 0, k = 31; i < 16; i++, k--) {
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output[ i] = clip23(buf_b[i] - buf_b[k]);
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output[16 + i] = clip23(buf_b[i] + buf_b[k]);
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}
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}
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static void mod64_a(const int *input, int *output)
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{
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static const int cos_mod[32] = {
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4195568, 4205700, 4226086, 4256977,
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4298755, 4351949, 4417251, 4495537,
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4587901, 4695690, 4820557, 4964534,
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5130115, 5320382, 5539164, 5791261,
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-6082752, -6421430, -6817439, -7284203,
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-7839855, -8509474, -9328732, -10350140,
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-11654242, -13371208, -15725922, -19143224,
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-24533560, -34264200, -57015280, -170908480
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};
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int i, k;
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for (i = 0; i < 16; i++)
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output[i] = mul23(cos_mod[i], input[i] + input[16 + i]);
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for (i = 16, k = 15; i < 32; i++, k--)
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output[i] = mul23(cos_mod[i], input[k] - input[16 + k]);
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}
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static void mod64_b(int *input, int *output)
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{
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static const int cos_mod[16] = {
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4199362, 4240198, 4323885, 4454708,
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4639772, 4890013, 5221943, 5660703,
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6245623, 7040975, 8158494, 9809974,
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12450076, 17261920, 28585092, 85479984
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};
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int i, k;
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for (i = 0; i < 16; i++)
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input[16 + i] = mul23(cos_mod[i], input[16 + i]);
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for (i = 0; i < 16; i++)
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output[i] = input[i] + input[16 + i];
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for (i = 16, k = 15; i < 32; i++, k--)
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output[i] = input[k] - input[16 + k];
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}
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static void mod64_c(const int *input, int *output)
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{
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static const int cos_mod[64] = {
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741511, 741958, 742853, 744199,
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746001, 748262, 750992, 754197,
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757888, 762077, 766777, 772003,
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777772, 784105, 791021, 798546,
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806707, 815532, 825054, 835311,
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846342, 858193, 870912, 884554,
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899181, 914860, 931667, 949686,
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969011, 989747, 1012012, 1035941,
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-1061684, -1089412, -1119320, -1151629,
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-1186595, -1224511, -1265719, -1310613,
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-1359657, -1413400, -1472490, -1537703,
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-1609974, -1690442, -1780506, -1881904,
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-1996824, -2128058, -2279225, -2455101,
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-2662128, -2909200, -3208956, -3579983,
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-4050785, -4667404, -5509372, -6726913,
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-8641940, -12091426, -20144284, -60420720
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};
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int i, k;
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for (i = 0; i < 32; i++)
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output[i] = mul23(cos_mod[i], input[i] + input[32 + i]);
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for (i = 32, k = 31; i < 64; i++, k--)
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output[i] = mul23(cos_mod[i], input[k] - input[32 + k]);
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}
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static void imdct_half_64(int32_t *output, const int32_t *input)
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{
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int buf_a[64], buf_b[64];
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int i, k, mag, shift, round;
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mag = 0;
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for (i = 0; i < 64; i++)
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mag += abs(input[i]);
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shift = mag > 0x400000 ? 2 : 0;
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round = shift > 0 ? 1 << (shift - 1) : 0;
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for (i = 0; i < 64; i++)
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buf_a[i] = (input[i] + round) >> shift;
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sum_a(buf_a, buf_b + 0, 32);
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sum_b(buf_a, buf_b + 32, 32);
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clp_v(buf_b, 64);
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sum_a(buf_b + 0, buf_a + 0, 16);
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sum_b(buf_b + 0, buf_a + 16, 16);
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sum_c(buf_b + 32, buf_a + 32, 16);
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sum_d(buf_b + 32, buf_a + 48, 16);
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clp_v(buf_a, 64);
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sum_a(buf_a + 0, buf_b + 0, 8);
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sum_b(buf_a + 0, buf_b + 8, 8);
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sum_c(buf_a + 16, buf_b + 16, 8);
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sum_d(buf_a + 16, buf_b + 24, 8);
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sum_c(buf_a + 32, buf_b + 32, 8);
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sum_d(buf_a + 32, buf_b + 40, 8);
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sum_c(buf_a + 48, buf_b + 48, 8);
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sum_d(buf_a + 48, buf_b + 56, 8);
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clp_v(buf_b, 64);
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dct_a(buf_b + 0, buf_a + 0);
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dct_b(buf_b + 8, buf_a + 8);
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dct_b(buf_b + 16, buf_a + 16);
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dct_b(buf_b + 24, buf_a + 24);
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dct_b(buf_b + 32, buf_a + 32);
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dct_b(buf_b + 40, buf_a + 40);
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dct_b(buf_b + 48, buf_a + 48);
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dct_b(buf_b + 56, buf_a + 56);
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clp_v(buf_a, 64);
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mod_a(buf_a + 0, buf_b + 0);
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mod_b(buf_a + 16, buf_b + 16);
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mod_b(buf_a + 32, buf_b + 32);
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mod_b(buf_a + 48, buf_b + 48);
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clp_v(buf_b, 64);
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mod64_a(buf_b + 0, buf_a + 0);
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mod64_b(buf_b + 32, buf_a + 32);
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clp_v(buf_a, 64);
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mod64_c(buf_a, buf_b);
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for (i = 0; i < 64; i++)
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buf_b[i] = clip23(buf_b[i] * (1 << shift));
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for (i = 0, k = 63; i < 32; i++, k--) {
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output[ i] = clip23(buf_b[i] - buf_b[k]);
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output[32 + i] = clip23(buf_b[i] + buf_b[k]);
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}
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}
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av_cold void ff_dcadct_init(DCADCTContext *c)
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{
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c->imdct_half[0] = imdct_half_32;
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c->imdct_half[1] = imdct_half_64;
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}
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