repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Header file for hardcoded QDM2 tables | |
| 3 | * | |
| 4 | * Copyright (c) 2010 Reimar Döffinger <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 | |
| 39 | static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1]; | |
| 40 | static float noise_table[4096 + 20]; | |
| 41 | static uint8_t random_dequant_index[256][5]; | |
| 42 | static uint8_t random_dequant_type24[128][3]; | |
| 43 | static float noise_samples[128]; | |
| 44 | ||
| 45 | static 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 | |
| 55 | static 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 | ||
| 86 | static 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 */ |