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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * Header file for hardcoded QDM2 tables |
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| 3 | * |
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| 4 | * Copyright (c) 2010 Reimar Döffinger |
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| 5 | * |
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| 6 | * This file is part of FFmpeg. |
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| 7 | * |
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| 8 | * FFmpeg is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Lesser General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2.1 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * FFmpeg is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public |
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| 19 | * License along with FFmpeg; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |||
| 23 | #ifndef AVCODEC_QDM2_TABLEGEN_H |
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| 24 | #define AVCODEC_QDM2_TABLEGEN_H |
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| 25 | |||
| 26 | #include |
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| 27 | #include |
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| 28 | #include "libavutil/attributes.h" |
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| 29 | |||
| 30 | #define SOFTCLIP_THRESHOLD 27600 |
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| 31 | #define HARDCLIP_THRESHOLD 35716 |
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| 32 | |||
| 33 | #if CONFIG_HARDCODED_TABLES |
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| 34 | #define softclip_table_init() |
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| 35 | #define rnd_table_init() |
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| 36 | #define init_noise_samples() |
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| 37 | #include "libavcodec/qdm2_tables.h" |
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| 38 | #else |
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| 39 | static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1]; |
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| 40 | static float noise_table[4096 + 20]; |
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| 41 | static uint8_t random_dequant_index[256][5]; |
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| 42 | static uint8_t random_dequant_type24[128][3]; |
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| 43 | static float noise_samples[128]; |
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| 44 | |||
| 45 | static av_cold void softclip_table_init(void) { |
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| 46 | int i; |
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| 47 | double dfl = SOFTCLIP_THRESHOLD - 32767; |
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| 48 | float delta = 1.0 / -dfl; |
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| 49 | for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++) |
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| 50 | softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF); |
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| 51 | } |
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| 52 | |||
| 53 | |||
| 54 | // random generated table |
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| 55 | static av_cold void rnd_table_init(void) { |
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| 56 | int i,j; |
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| 57 | uint32_t ldw; |
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| 58 | uint64_t random_seed = 0; |
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| 59 | float delta = 1.0 / 16384.0; |
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| 60 | for(i = 0; i < 4096 ;i++) { |
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| 61 | random_seed = random_seed * 214013 + 2531011; |
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| 62 | noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3; |
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| 63 | } |
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| 64 | |||
| 65 | for (i = 0; i < 256 ;i++) { |
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| 66 | random_seed = 81; |
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| 67 | ldw = i; |
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| 68 | for (j = 0; j < 5 ;j++) { |
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| 69 | random_dequant_index[i][j] = ldw / random_seed; |
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| 70 | ldw %= random_seed; |
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| 71 | random_seed /= 3; |
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| 72 | } |
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| 73 | } |
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| 74 | for (i = 0; i < 128 ;i++) { |
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| 75 | random_seed = 25; |
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| 76 | ldw = i; |
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| 77 | for (j = 0; j < 3 ;j++) { |
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| 78 | random_dequant_type24[i][j] = ldw / random_seed; |
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| 79 | ldw %= random_seed; |
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| 80 | random_seed /= 5; |
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| 81 | } |
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| 82 | } |
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| 83 | } |
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| 84 | |||
| 85 | |||
| 86 | static av_cold void init_noise_samples(void) { |
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| 87 | int i; |
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| 88 | unsigned random_seed = 0; |
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| 89 | float delta = 1.0 / 16384.0; |
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| 90 | for (i = 0; i < 128;i++) { |
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| 91 | random_seed = random_seed * 214013 + 2531011; |
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| 92 | noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0); |
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| 93 | } |
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| 94 | } |
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| 95 | #endif /* CONFIG_HARDCODED_TABLES */ |
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| 96 | |||
| 97 | #endif /* AVCODEC_QDM2_TABLEGEN_H */ |