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/*
* 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"
#include "qdm2data.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()
#define qdm2_init_vlc()
#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);
}
}
static VLC vlc_tab_level;
static VLC vlc_tab_diff;
static VLC vlc_tab_run;
static VLC fft_level_exp_alt_vlc;
static VLC fft_level_exp_vlc;
static VLC fft_stereo_exp_vlc;
static VLC fft_stereo_phase_vlc;
static VLC vlc_tab_tone_level_idx_hi1;
static VLC vlc_tab_tone_level_idx_mid;
static VLC vlc_tab_tone_level_idx_hi2;
static VLC vlc_tab_type30;
static VLC vlc_tab_type34;
static VLC vlc_tab_fft_tone_offset[5];
static VLCElem qdm2_table[3838];
static av_cold void build_vlc(VLC *vlc, int nb_bits, int nb_codes,
unsigned *offset, const uint8_t tab[][2])
{
vlc->table = &qdm2_table[*offset];
vlc->table_allocated = FF_ARRAY_ELEMS(qdm2_table) - *offset;
ff_init_vlc_from_lengths(vlc, nb_bits, nb_codes,
&tab[0][1], 2, &tab[0][0], 2, 1,
-1, INIT_VLC_STATIC_OVERLONG | INIT_VLC_LE, NULL);
*offset += vlc->table_size;
}
static av_cold void qdm2_init_vlc(void)
{
const uint8_t (*tab)[2] = tab_fft_tone_offset;
unsigned offset = 0;
build_vlc(&vlc_tab_level, 8, 24, &offset, tab_level);
build_vlc(&vlc_tab_diff, 8, 33, &offset, tab_diff);
build_vlc(&vlc_tab_run, 5, 6, &offset, tab_run);
build_vlc(&fft_level_exp_alt_vlc, 8, 28, &offset, fft_level_exp_alt);
build_vlc(&fft_level_exp_vlc, 8, 20, &offset, fft_level_exp);
build_vlc(&fft_stereo_exp_vlc, 6, 7, &offset, fft_stereo_exp);
build_vlc(&fft_stereo_phase_vlc, 6, 9, &offset, fft_stereo_phase);
build_vlc(&vlc_tab_tone_level_idx_hi1, 8, 20, &offset, tab_tone_level_idx_hi1);
build_vlc(&vlc_tab_tone_level_idx_mid, 8, 13, &offset, tab_tone_level_idx_mid);
build_vlc(&vlc_tab_tone_level_idx_hi2, 8, 18, &offset, tab_tone_level_idx_hi2);
build_vlc(&vlc_tab_type30, 6, 9, &offset, tab_type30);
build_vlc(&vlc_tab_type34, 5, 10, &offset, tab_type34);
for (int i = 0; i < 5; i++) {
build_vlc(&vlc_tab_fft_tone_offset[i], 8, tab_fft_tone_offset_sizes[i],
&offset, tab);
tab += tab_fft_tone_offset_sizes[i];
}
}
#endif /* CONFIG_HARDCODED_TABLES */
#endif /* AVCODEC_QDM2_TABLEGEN_H */
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