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102 lines
3.2 KiB
102 lines
3.2 KiB
/* |
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* Header file for hardcoded QDM2 tables |
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* |
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* Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef QDM2_TABLEGEN_H |
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#define QDM2_TABLEGEN_H |
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#include <stdint.h> |
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#include <math.h> |
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#include "libavutil/attributes.h" |
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#define SOFTCLIP_THRESHOLD 27600 |
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#define HARDCLIP_THRESHOLD 35716 |
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#if CONFIG_HARDCODED_TABLES |
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#define softclip_table_init() |
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#define rnd_table_init() |
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#define init_noise_samples() |
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#include "libavcodec/qdm2_tables.h" |
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#else |
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static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1]; |
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static float noise_table[4096]; |
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static uint8_t random_dequant_index[256][5]; |
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static uint8_t random_dequant_type24[128][3]; |
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static float noise_samples[128]; |
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static av_cold void softclip_table_init(void) { |
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int i; |
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double dfl = SOFTCLIP_THRESHOLD - 32767; |
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float delta = 1.0 / -dfl; |
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for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++) |
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softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF); |
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} |
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// random generated table |
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static av_cold void rnd_table_init(void) { |
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int i,j; |
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uint32_t ldw,hdw; |
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uint64_t tmp64_1; |
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uint64_t random_seed = 0; |
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float delta = 1.0 / 16384.0; |
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for(i = 0; i < 4096 ;i++) { |
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random_seed = random_seed * 214013 + 2531011; |
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noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3; |
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} |
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for (i = 0; i < 256 ;i++) { |
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random_seed = 81; |
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ldw = i; |
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for (j = 0; j < 5 ;j++) { |
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random_dequant_index[i][j] = (uint8_t)((ldw / random_seed) & 0xFF); |
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ldw = (uint32_t)ldw % (uint32_t)random_seed; |
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tmp64_1 = (random_seed * 0x55555556); |
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hdw = (uint32_t)(tmp64_1 >> 32); |
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random_seed = (uint64_t)(hdw + (ldw >> 31)); |
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} |
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} |
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for (i = 0; i < 128 ;i++) { |
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random_seed = 25; |
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ldw = i; |
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for (j = 0; j < 3 ;j++) { |
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random_dequant_type24[i][j] = (uint8_t)((ldw / random_seed) & 0xFF); |
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ldw = (uint32_t)ldw % (uint32_t)random_seed; |
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tmp64_1 = (random_seed * 0x66666667); |
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hdw = (uint32_t)(tmp64_1 >> 33); |
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random_seed = hdw + (ldw >> 31); |
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} |
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} |
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} |
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static av_cold void init_noise_samples(void) { |
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int i; |
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int random_seed = 0; |
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float delta = 1.0 / 16384.0; |
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for (i = 0; i < 128;i++) { |
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random_seed = random_seed * 214013 + 2531011; |
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noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0); |
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} |
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} |
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#endif /* CONFIG_HARDCODED_TABLES */ |
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#endif /* QDM2_TABLEGEN_H */
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