ref: 7f3a73551ab8b2018fba0f0f4811778549c0e944
dir: /libfaad/drm_dec.c/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR and PS decoding
** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Ahead Software through [email protected].
**
** $Id: drm_dec.c,v 1.1 2004/01/19 21:49:53 menno Exp $
**/
#include "common.h"
#ifdef DRM
#include "drm_dec.h"
#include "bits.h"
/* constants */
#define NUM_SA_BANDS 8
#define NUM_PAN_BANDS 20
/* type definitaions */
typedef const int8_t (*drm_ps_huff_tab)[2];
/* binary search huffman tables */
static const int8_t f_huffman_sa[][2] = {
{ /*0*/ -15, 1 }, /* index 0: 1 bits: x */
{ 2, 3 }, /* index 1: 2 bits: 1x */
{ /*7*/ -8, 4 }, /* index 2: 3 bits: 10x */
{ 5, 6 }, /* index 3: 3 bits: 11x */
{ /*1*/ -14, /*-1*/ -16 }, /* index 4: 4 bits: 101x */
{ /*-2*/ -17, 7 }, /* index 5: 4 bits: 110x */
{ 8, 9 }, /* index 6: 4 bits: 111x */
{ /*2*/ -13, /*-3*/ -18 }, /* index 7: 5 bits: 1101x */
{ /*3*/ -12, 10 }, /* index 8: 5 bits: 1110x */
{ 11, 12 }, /* index 9: 5 bits: 1111x */
{ /*4*/ -11, /*5*/ -10 }, /* index 10: 6 bits: 11101x */
{ /*-4*/ -19, /*-5*/ -20 }, /* index 11: 6 bits: 11110x */
{ /*6*/ -9, 13 }, /* index 12: 6 bits: 11111x */
{ /*-7*/ -22, /*-6*/ -21 } /* index 13: 7 bits: 111111x */
};
static const int8_t t_huffman_sa[][2] = {
{ /*0*/ -15, 1 }, /* index 0: 1 bits: x */
{ 2, 3 }, /* index 1: 2 bits: 1x */
{ /*-1*/ -16, /*1*/ -14 }, /* index 2: 3 bits: 10x */
{ 4, 5 }, /* index 3: 3 bits: 11x */
{ /*-2*/ -17, /*2*/ -13 }, /* index 4: 4 bits: 110x */
{ 6, 7 }, /* index 5: 4 bits: 111x */
{ /*-3*/ -18, /*3*/ -12 }, /* index 6: 5 bits: 1110x */
{ 8, 9 }, /* index 7: 5 bits: 1111x */
{ /*-4*/ -19, /*4*/ -11 }, /* index 8: 6 bits: 11110x */
{ 10, 11 }, /* index 9: 6 bits: 11111x */
{ /*-5*/ -20, /*5*/ -10 }, /* index 10: 7 bits: 111110x */
{ /*-6*/ -21, 12 }, /* index 11: 7 bits: 111111x */
{ /*-7*/ -22, 13 }, /* index 12: 8 bits: 1111111x */
{ /*6*/ -9, /*7*/ -8 } /* index 13: 9 bits: 11111111x */
};
static const int8_t f_huffman_pan[][2] = {
{ /*0*/ -15, 1 }, /* index 0: 1 bits: x */
{ /*-1*/ -16, 2 }, /* index 1: 2 bits: 1x */
{ /*1*/ -14, 3 }, /* index 2: 3 bits: 11x */
{ 4, 5 }, /* index 3: 4 bits: 111x */
{ /*-2*/ -17, /*2*/ -13 }, /* index 4: 5 bits: 1110x */
{ 6, 7 }, /* index 5: 5 bits: 1111x */
{ /*-3*/ -18, /*3*/ -12 }, /* index 6: 6 bits: 11110x */
{ 8, 9 }, /* index 7: 6 bits: 11111x */
{ /*-4*/ -19, /*4*/ -11 }, /* index 8: 7 bits: 111110x */
{ 10, 11 }, /* index 9: 7 bits: 111111x */
{ /*-5*/ -20, /*5*/ -10 }, /* index 10: 8 bits: 1111110x */
{ 12, 13 }, /* index 11: 8 bits: 1111111x */
{ /*-6*/ -21, /*6*/ -9 }, /* index 12: 9 bits: 11111110x */
{ /*-7*/ -22, 14 }, /* index 13: 9 bits: 11111111x */
{ /*7*/ -8, 15 }, /* index 14: 10 bits: 111111111x */
{ 16, 17 }, /* index 15: 11 bits: 1111111111x */
{ /*-8*/ -23, /*8*/ -7 }, /* index 16: 12 bits: 11111111110x */
{ 18, 19 }, /* index 17: 12 bits: 11111111111x */
{ /*-10*/ -25, 20 }, /* index 18: 13 bits: 111111111110x */
{ 21, 22 }, /* index 19: 13 bits: 111111111111x */
{ /*-9*/ -24, /*9*/ -6 }, /* index 20: 14 bits: 1111111111101x */
{ /*10*/ -5, 23 }, /* index 21: 14 bits: 1111111111110x */
{ 24, 25 }, /* index 22: 14 bits: 1111111111111x */
{ /*-13*/ -28, /*-11*/ -26 }, /* index 23: 15 bits: 11111111111101x */
{ /*11*/ -4, /*13*/ -2 }, /* index 24: 15 bits: 11111111111110x */
{ 26, 27 }, /* index 25: 15 bits: 11111111111111x */
{ /*-14*/ -29, /*-12*/ -27 }, /* index 26: 16 bits: 111111111111110x */
{ /*12*/ -3, /*14*/ -1 } /* index 27: 16 bits: 111111111111111x */
};
static const int8_t t_huffman_pan[][2] = {
{ /*0*/ -15, 1 }, /* index 0: 1 bits: x */
{ /*-1*/ -16, 2 }, /* index 1: 2 bits: 1x */
{ /*1*/ -14, 3 }, /* index 2: 3 bits: 11x */
{ /*-2*/ -17, 4 }, /* index 3: 4 bits: 111x */
{ /*2*/ -13, 5 }, /* index 4: 5 bits: 1111x */
{ /*-3*/ -18, 6 }, /* index 5: 6 bits: 11111x */
{ /*3*/ -12, 7 }, /* index 6: 7 bits: 111111x */
{ /*-4*/ -19, 8 }, /* index 7: 8 bits: 1111111x */
{ /*4*/ -11, 9 }, /* index 8: 9 bits: 11111111x */
{ 10, 11 }, /* index 9: 10 bits: 111111111x */
{ /*-5*/ -20, /*5*/ -10 }, /* index 10: 11 bits: 1111111110x */
{ 12, 13 }, /* index 11: 11 bits: 1111111111x */
{ /*-6*/ -21, /*6*/ -9 }, /* index 12: 12 bits: 11111111110x */
{ 14, 15 }, /* index 13: 12 bits: 11111111111x */
{ /*-7*/ -22, /*7*/ -8 }, /* index 14: 13 bits: 111111111110x */
{ 16, 17 }, /* index 15: 13 bits: 111111111111x */
{ /*-8*/ -23, /*8*/ -7 }, /* index 16: 14 bits: 1111111111110x */
{ 18, 19 }, /* index 17: 14 bits: 1111111111111x */
{ /*-10*/ -25, /*10*/ -5 }, /* index 18: 15 bits: 11111111111110x */
{ 20, 21 }, /* index 19: 15 bits: 11111111111111x */
{ /*-9*/ -24, /*9*/ -6 }, /* index 20: 16 bits: 111111111111110x */
{ 22, 23 }, /* index 21: 16 bits: 111111111111111x */
{ 24, 25 }, /* index 22: 17 bits: 1111111111111110x */
{ 26, 27 }, /* index 23: 17 bits: 1111111111111111x */
{ /*-14*/ -29, /*-13*/ -28 }, /* index 24: 18 bits: 11111111111111100x */
{ /*-12*/ -27, /*-11*/ -26 }, /* index 25: 18 bits: 11111111111111101x */
{ /*11*/ -4, /*12*/ -3 }, /* index 26: 18 bits: 11111111111111110x */
{ /*13*/ -2, /*14*/ -1 } /* index 27: 18 bits: 11111111111111111x */
};
/* static function declarations */
static void drm_ps_sa_element(drm_ps_info *ps, bitfile *ld);
static void drm_ps_pan_element(drm_ps_info *ps, bitfile *ld);
static int8_t huff_dec(bitfile *ld, drm_ps_huff_tab huff);
uint16_t drm_ps_data(drm_ps_info *ps, bitfile *ld)
{
uint16_t bits = (uint16_t)faad_get_processed_bits(ld);
ps->bs_enable_sa = faad_get1bit(ld);
if (ps->bs_enable_sa)
{
drm_ps_sa_element(ps, ld);
}
ps->bs_enable_pan = faad_get1bit(ld);
if (ps->bs_enable_pan)
{
drm_ps_pan_element(ps, ld);
}
bits = (uint16_t)faad_get_processed_bits(ld) - bits;
return bits;
}
static void drm_ps_sa_element(drm_ps_info *ps, bitfile *ld)
{
drm_ps_huff_tab huff;
uint8_t band;
ps->bs_sa_dt_flag = faad_get1bit(ld);
if (ps->bs_sa_dt_flag)
{
huff = t_huffman_sa;
} else {
huff = f_huffman_sa;
}
for (band = 0; band < NUM_SA_BANDS; band++)
{
ps->bs_sa_data[band] = huff_dec(ld, huff);
}
}
static void drm_ps_pan_element(drm_ps_info *ps, bitfile *ld)
{
drm_ps_huff_tab huff;
uint8_t band;
ps->bs_pan_dt_flag = faad_get1bit(ld);
if (ps->bs_pan_dt_flag)
{
huff = t_huffman_pan;
} else {
huff = f_huffman_pan;
}
for (band = 0; band < NUM_PAN_BANDS; band++)
{
ps->bs_pan_data[band] = huff_dec(ld, huff);
}
}
/* binary search huffman decoding */
static int8_t huff_dec(bitfile *ld, drm_ps_huff_tab huff)
{
uint8_t bit;
int16_t index = 0;
while (index >= 0)
{
bit = (uint8_t)faad_get1bit(ld);
index = huff[index][bit];
}
return index + 15;
}
#endif