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  1. /*
  2.  * Header file for hardcoded QDM2 tables
  3.  *
  4.  * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef AVCODEC_QDM2_TABLEGEN_H
  24. #define AVCODEC_QDM2_TABLEGEN_H
  25.  
  26. #include <stdint.h>
  27. #include <math.h>
  28. #include "libavutil/attributes.h"
  29.  
  30. #define SOFTCLIP_THRESHOLD 27600
  31. #define HARDCLIP_THRESHOLD 35716
  32.  
  33. #if CONFIG_HARDCODED_TABLES
  34. #define softclip_table_init()
  35. #define rnd_table_init()
  36. #define init_noise_samples()
  37. #include "libavcodec/qdm2_tables.h"
  38. #else
  39. static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1];
  40. static float noise_table[4096 + 20];
  41. static uint8_t random_dequant_index[256][5];
  42. static uint8_t random_dequant_type24[128][3];
  43. static float noise_samples[128];
  44.  
  45. static av_cold void softclip_table_init(void) {
  46.     int i;
  47.     double dfl = SOFTCLIP_THRESHOLD - 32767;
  48.     float delta = 1.0 / -dfl;
  49.     for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++)
  50.         softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF);
  51. }
  52.  
  53.  
  54. // random generated table
  55. static av_cold void rnd_table_init(void) {
  56.     int i,j;
  57.     uint32_t ldw;
  58.     uint64_t random_seed = 0;
  59.     float delta = 1.0 / 16384.0;
  60.     for(i = 0; i < 4096 ;i++) {
  61.         random_seed = random_seed * 214013 + 2531011;
  62.         noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3;
  63.     }
  64.  
  65.     for (i = 0; i < 256 ;i++) {
  66.         random_seed = 81;
  67.         ldw = i;
  68.         for (j = 0; j < 5 ;j++) {
  69.             random_dequant_index[i][j] = ldw / random_seed;
  70.             ldw %= random_seed;
  71.             random_seed /= 3;
  72.         }
  73.     }
  74.     for (i = 0; i < 128 ;i++) {
  75.         random_seed = 25;
  76.         ldw = i;
  77.         for (j = 0; j < 3 ;j++) {
  78.             random_dequant_type24[i][j] = ldw / random_seed;
  79.             ldw %= random_seed;
  80.             random_seed /= 5;
  81.         }
  82.     }
  83. }
  84.  
  85.  
  86. static av_cold void init_noise_samples(void) {
  87.     int i;
  88.     unsigned random_seed = 0;
  89.     float delta = 1.0 / 16384.0;
  90.     for (i = 0; i < 128;i++) {
  91.         random_seed = random_seed * 214013 + 2531011;
  92.         noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0);
  93.     }
  94. }
  95. #endif /* CONFIG_HARDCODED_TABLES */
  96.  
  97. #endif /* AVCODEC_QDM2_TABLEGEN_H */
  98.