1/*
2 * Header file for hardcoded QDM2 tables
3 *
4 * Copyright (c) 2010 Reimar D��ffinger <Reimar.Doeffinger@gmx.de>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#ifndef AVCODEC_QDM2_TABLEGEN_H
24#define AVCODEC_QDM2_TABLEGEN_H
25
26#include <stdint.h>
27#include <math.h>
28#include "libavutil/attributes.h"
29
30#define SOFTCLIP_THRESHOLD 27600
31#define HARDCLIP_THRESHOLD 35716
32
33#if CONFIG_HARDCODED_TABLES
34#define softclip_table_init()
35#define rnd_table_init()
36#define init_noise_samples()
37#include "libavcodec/qdm2_tables.h"
38#else
39static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1];
40static float noise_table[4096 + 20];
41static uint8_t random_dequant_index[256][5];
42static uint8_t random_dequant_type24[128][3];
43static float noise_samples[128];
44
45static av_cold void softclip_table_init(void) {
46    int i;
47    double dfl = SOFTCLIP_THRESHOLD - 32767;
48    float delta = 1.0 / -dfl;
49    for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++)
50        softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF);
51}
52
53
54// random generated table
55static av_cold void rnd_table_init(void) {
56    int i,j;
57    uint32_t ldw;
58    uint64_t random_seed = 0;
59    float delta = 1.0 / 16384.0;
60    for(i = 0; i < 4096 ;i++) {
61        random_seed = random_seed * 214013 + 2531011;
62        noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3;
63    }
64
65    for (i = 0; i < 256 ;i++) {
66        random_seed = 81;
67        ldw = i;
68        for (j = 0; j < 5 ;j++) {
69            random_dequant_index[i][j] = ldw / random_seed;
70            ldw %= random_seed;
71            random_seed /= 3;
72        }
73    }
74    for (i = 0; i < 128 ;i++) {
75        random_seed = 25;
76        ldw = i;
77        for (j = 0; j < 3 ;j++) {
78            random_dequant_type24[i][j] = ldw / random_seed;
79            ldw %= random_seed;
80            random_seed /= 5;
81        }
82    }
83}
84
85
86static av_cold void init_noise_samples(void) {
87    int i;
88    unsigned random_seed = 0;
89    float delta = 1.0 / 16384.0;
90    for (i = 0; i < 128;i++) {
91        random_seed = random_seed * 214013 + 2531011;
92        noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0);
93    }
94}
95#endif /* CONFIG_HARDCODED_TABLES */
96
97#endif /* AVCODEC_QDM2_TABLEGEN_H */
98