mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
102 lines
3.3 KiB
102 lines
3.3 KiB
/* |
|
* Header file for hardcoded QDM2 tables |
|
* |
|
* Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg 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. |
|
* |
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#ifndef QDM2_TABLEGEN_H |
|
#define 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; |
|
int 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 /* QDM2_TABLEGEN_H */
|
|
|