mirror of
https://github.com/librempeg/librempeg
synced 2024-11-23 11:39:47 +00:00
c682514a8f
This code relies on the result wrapping as for unsigned values, and the sign is not used. Thus an unsigned type is proper here. Signed-off-by: Mans Rullgard <mans@mansr.com>
103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/*
|
|
* Header file for hardcoded QDM2 tables
|
|
*
|
|
* Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_QDM2_TABLEGEN_H
|
|
#define AVCODEC_QDM2_TABLEGEN_H
|
|
|
|
#include <stdint.h>
|
|
#include <math.h>
|
|
#include "libavutil/attributes.h"
|
|
|
|
#define SOFTCLIP_THRESHOLD 27600
|
|
#define HARDCLIP_THRESHOLD 35716
|
|
|
|
#if CONFIG_HARDCODED_TABLES
|
|
#define softclip_table_init()
|
|
#define rnd_table_init()
|
|
#define init_noise_samples()
|
|
#include "libavcodec/qdm2_tables.h"
|
|
#else
|
|
static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1];
|
|
static float noise_table[4096];
|
|
static uint8_t random_dequant_index[256][5];
|
|
static uint8_t random_dequant_type24[128][3];
|
|
static float noise_samples[128];
|
|
|
|
static av_cold void softclip_table_init(void) {
|
|
int i;
|
|
double dfl = SOFTCLIP_THRESHOLD - 32767;
|
|
float delta = 1.0 / -dfl;
|
|
for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++)
|
|
softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF);
|
|
}
|
|
|
|
|
|
// random generated table
|
|
static av_cold void rnd_table_init(void) {
|
|
int i,j;
|
|
uint32_t ldw,hdw;
|
|
uint64_t tmp64_1;
|
|
uint64_t random_seed = 0;
|
|
float delta = 1.0 / 16384.0;
|
|
for(i = 0; i < 4096 ;i++) {
|
|
random_seed = random_seed * 214013 + 2531011;
|
|
noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3;
|
|
}
|
|
|
|
for (i = 0; i < 256 ;i++) {
|
|
random_seed = 81;
|
|
ldw = i;
|
|
for (j = 0; j < 5 ;j++) {
|
|
random_dequant_index[i][j] = (uint8_t)((ldw / random_seed) & 0xFF);
|
|
ldw = (uint32_t)ldw % (uint32_t)random_seed;
|
|
tmp64_1 = (random_seed * 0x55555556);
|
|
hdw = (uint32_t)(tmp64_1 >> 32);
|
|
random_seed = (uint64_t)(hdw + (ldw >> 31));
|
|
}
|
|
}
|
|
for (i = 0; i < 128 ;i++) {
|
|
random_seed = 25;
|
|
ldw = i;
|
|
for (j = 0; j < 3 ;j++) {
|
|
random_dequant_type24[i][j] = (uint8_t)((ldw / random_seed) & 0xFF);
|
|
ldw = (uint32_t)ldw % (uint32_t)random_seed;
|
|
tmp64_1 = (random_seed * 0x66666667);
|
|
hdw = (uint32_t)(tmp64_1 >> 33);
|
|
random_seed = hdw + (ldw >> 31);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static av_cold void init_noise_samples(void) {
|
|
int i;
|
|
unsigned random_seed = 0;
|
|
float delta = 1.0 / 16384.0;
|
|
for (i = 0; i < 128;i++) {
|
|
random_seed = random_seed * 214013 + 2531011;
|
|
noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0);
|
|
}
|
|
}
|
|
#endif /* CONFIG_HARDCODED_TABLES */
|
|
|
|
#endif /* AVCODEC_QDM2_TABLEGEN_H */
|