/* * 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 + 20]; 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; 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] = ldw / random_seed; ldw %= random_seed; random_seed /= 3; } } for (i = 0; i < 128 ;i++) { random_seed = 25; ldw = i; for (j = 0; j < 3 ;j++) { random_dequant_type24[i][j] = ldw / random_seed; ldw %= random_seed; random_seed /= 5; } } } 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 */