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ffmpeg / libavcodec / qdm2_tablegen.h @ 2912e87a

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/*
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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 Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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 */