| /* |
| * 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 AVCODEC_QDM2_TABLEGEN_H |
| #define AVCODEC_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; |
| unsigned 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 /* AVCODEC_QDM2_TABLEGEN_H */ |