5c8ffbaa7f
Someone should rename the variables, theres nothing random in there Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/*
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* Header file for hardcoded QDM2 tables
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*
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* Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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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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#ifndef AVCODEC_QDM2_TABLEGEN_H
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#define AVCODEC_QDM2_TABLEGEN_H
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#include <stdint.h>
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#include <math.h>
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#include "libavutil/attributes.h"
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#define SOFTCLIP_THRESHOLD 27600
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#define HARDCLIP_THRESHOLD 35716
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#if CONFIG_HARDCODED_TABLES
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#define softclip_table_init()
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#define rnd_table_init()
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#define init_noise_samples()
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#include "libavcodec/qdm2_tables.h"
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#else
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static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1];
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static float noise_table[4096 + 20];
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static uint8_t random_dequant_index[256][5];
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static uint8_t random_dequant_type24[128][3];
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static float noise_samples[128];
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static av_cold void softclip_table_init(void) {
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int i;
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double dfl = SOFTCLIP_THRESHOLD - 32767;
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float delta = 1.0 / -dfl;
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for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++)
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softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF);
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}
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// random generated table
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static av_cold void rnd_table_init(void) {
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int i,j;
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uint32_t ldw;
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uint64_t random_seed = 0;
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float delta = 1.0 / 16384.0;
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for(i = 0; i < 4096 ;i++) {
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random_seed = random_seed * 214013 + 2531011;
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noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3;
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}
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for (i = 0; i < 256 ;i++) {
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random_seed = 81;
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ldw = i;
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for (j = 0; j < 5 ;j++) {
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random_dequant_index[i][j] = ldw / random_seed;
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ldw %= random_seed;
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random_seed /= 3;
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}
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}
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for (i = 0; i < 128 ;i++) {
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random_seed = 25;
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ldw = i;
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for (j = 0; j < 3 ;j++) {
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random_dequant_type24[i][j] = ldw / random_seed;
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ldw %= random_seed;
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random_seed /= 5;
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}
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}
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}
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static av_cold void init_noise_samples(void) {
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int i;
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unsigned random_seed = 0;
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float delta = 1.0 / 16384.0;
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for (i = 0; i < 128;i++) {
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random_seed = random_seed * 214013 + 2531011;
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noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0);
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}
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}
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#endif /* CONFIG_HARDCODED_TABLES */
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#endif /* AVCODEC_QDM2_TABLEGEN_H */
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