/*
  * 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 */