ref: e2defb318bc7f8fec0a515c703dc7a660a4e2454
dir: /libfaad/ps_syntax.c/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2005 M. Bakker, Nero 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.
**
** Software using this code must display the following message visibly in or
** on each copy of the software:
** "FAAD2 AAC/HE-AAC/HE-AACv2/DRM decoder (c) Nero AG, www.nero.com"
** in, for example, the about-box or help/startup screen.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Nero AG through [email protected].
**
** $Id: ps_syntax.c,v 1.9 2006/08/15 19:05:11 menno Exp $
**/
#include "common.h"
#ifdef PS_DEC
#include "bits.h"
#include "ps_dec.h"
/* type definitaions */
typedef const int8_t (*ps_huff_tab)[2];
/* static data tables */
static const uint8_t nr_iid_par_tab[] = {
10, 20, 34, 10, 20, 34, 0, 0
};
static const uint8_t nr_ipdopd_par_tab[] = {
5, 11, 17, 5, 11, 17, 0, 0
};
static const uint8_t nr_icc_par_tab[] = {
10, 20, 34, 10, 20, 34, 0, 0
};
static const uint8_t num_env_tab[][4] = {
{ 0, 1, 2, 4 },
{ 1, 2, 3, 4 }
};
/* binary lookup huffman tables */
static const int8_t f_huff_iid_def[][2] = {
{ /*0*/ -31, 1 }, /* index 0: 1 bits: x */
{ 2, 3 }, /* index 1: 2 bits: 1x */
{ /*1*/ -30, /*-1*/ -32 }, /* index 2: 3 bits: 10x */
{ 4, 5 }, /* index 3: 3 bits: 11x */
{ /*2*/ -29, /*-2*/ -33 }, /* index 4: 4 bits: 110x */
{ 6, 7 }, /* index 5: 4 bits: 111x */
{ /*3*/ -28, /*-3*/ -34 }, /* index 6: 5 bits: 1110x */
{ 8, 9 }, /* index 7: 5 bits: 1111x */
{ /*-4*/ -35, /*4*/ -27 }, /* index 8: 6 bits: 11110x */
{ /*5*/ -26, 10 }, /* index 9: 6 bits: 11111x */
{ /*-5*/ -36, 11 }, /* index 10: 7 bits: 111111x */
{ /*6*/ -25, 12 }, /* index 11: 8 bits: 1111111x */
{ /*-6*/ -37, 13 }, /* index 12: 9 bits: 11111111x */
{ /*-7*/ -38, 14 }, /* index 13: 10 bits: 111111111x */
{ /*7*/ -24, 15 }, /* index 14: 11 bits: 1111111111x */
{ 16, 17 }, /* index 15: 12 bits: 11111111111x */
{ /*8*/ -23, /*-8*/ -39 }, /* index 16: 13 bits: 111111111110x */
{ 18, 19 }, /* index 17: 13 bits: 111111111111x */
{ /*9*/ -22, /*10*/ -21 }, /* index 18: 14 bits: 1111111111110x */
{ 20, 21 }, /* index 19: 14 bits: 1111111111111x */
{ /*-9*/ -40, /*11*/ -20 }, /* index 20: 15 bits: 11111111111110x */
{ 22, 23 }, /* index 21: 15 bits: 11111111111111x */
{ /*-10*/ -41, 24 }, /* index 22: 16 bits: 111111111111110x */
{ 25, 26 }, /* index 23: 16 bits: 111111111111111x */
{ /*-11*/ -42, /*-14*/ -45 }, /* index 24: 17 bits: 1111111111111101x */
{ /*-13*/ -44, /*-12*/ -43 }, /* index 25: 17 bits: 1111111111111110x */
{ /*12*/ -19, 27 }, /* index 26: 17 bits: 1111111111111111x */
{ /*13*/ -18, /*14*/ -17 } /* index 27: 18 bits: 11111111111111111x */
};
static const int8_t t_huff_iid_def[][2] = {
{ /*0*/ -31, 1 }, /* index 0: 1 bits: x */
{ /*-1*/ -32, 2 }, /* index 1: 2 bits: 1x */
{ /*1*/ -30, 3 }, /* index 2: 3 bits: 11x */
{ /*-2*/ -33, 4 }, /* index 3: 4 bits: 111x */
{ /*2*/ -29, 5 }, /* index 4: 5 bits: 1111x */
{ /*-3*/ -34, 6 }, /* index 5: 6 bits: 11111x */
{ /*3*/ -28, 7 }, /* index 6: 7 bits: 111111x */
{ /*-4*/ -35, 8 }, /* index 7: 8 bits: 1111111x */
{ /*4*/ -27, 9 }, /* index 8: 9 bits: 11111111x */
{ /*-5*/ -36, 10 }, /* index 9: 10 bits: 111111111x */
{ /*5*/ -26, 11 }, /* index 10: 11 bits: 1111111111x */
{ /*-6*/ -37, 12 }, /* index 11: 12 bits: 11111111111x */
{ /*6*/ -25, 13 }, /* index 12: 13 bits: 111111111111x */
{ /*7*/ -24, 14 }, /* index 13: 14 bits: 1111111111111x */
{ /*-7*/ -38, 15 }, /* index 14: 15 bits: 11111111111111x */
{ 16, 17 }, /* index 15: 16 bits: 111111111111111x */
{ /*8*/ -23, /*-8*/ -39 }, /* index 16: 17 bits: 1111111111111110x */
{ 18, 19 }, /* index 17: 17 bits: 1111111111111111x */
{ 20, 21 }, /* index 18: 18 bits: 11111111111111110x */
{ 22, 23 }, /* index 19: 18 bits: 11111111111111111x */
{ /*9*/ -22, /*-14*/ -45 }, /* index 20: 19 bits: 111111111111111100x */
{ /*-13*/ -44, /*-12*/ -43 }, /* index 21: 19 bits: 111111111111111101x */
{ 24, 25 }, /* index 22: 19 bits: 111111111111111110x */
{ 26, 27 }, /* index 23: 19 bits: 111111111111111111x */
{ /*-11*/ -42, /*-10*/ -41 }, /* index 24: 20 bits: 1111111111111111100x */
{ /*-9*/ -40, /*10*/ -21 }, /* index 25: 20 bits: 1111111111111111101x */
{ /*11*/ -20, /*12*/ -19 }, /* index 26: 20 bits: 1111111111111111110x */
{ /*13*/ -18, /*14*/ -17 } /* index 27: 20 bits: 1111111111111111111x */
};
static const int8_t f_huff_iid_fine[][2] = {
{ 1, /*0*/ -31 }, /* index 0: 1 bits: x */
{ 2, 3 }, /* index 1: 2 bits: 0x */
{ 4, /*-1*/ -32 }, /* index 2: 3 bits: 00x */
{ /*1*/ -30, 5 }, /* index 3: 3 bits: 01x */
{ /*-2*/ -33, /*2*/ -29 }, /* index 4: 4 bits: 000x */
{ 6, 7 }, /* index 5: 4 bits: 011x */
{ /*-3*/ -34, /*3*/ -28 }, /* index 6: 5 bits: 0110x */
{ 8, 9 }, /* index 7: 5 bits: 0111x */
{ /*-4*/ -35, /*4*/ -27 }, /* index 8: 6 bits: 01110x */
{ 10, 11 }, /* index 9: 6 bits: 01111x */
{ /*-5*/ -36, /*5*/ -26 }, /* index 10: 7 bits: 011110x */
{ 12, 13 }, /* index 11: 7 bits: 011111x */
{ /*-6*/ -37, /*6*/ -25 }, /* index 12: 8 bits: 0111110x */
{ 14, 15 }, /* index 13: 8 bits: 0111111x */
{ /*7*/ -24, 16 }, /* index 14: 9 bits: 01111110x */
{ 17, 18 }, /* index 15: 9 bits: 01111111x */
{ 19, /*-8*/ -39 }, /* index 16: 10 bits: 011111101x */
{ /*8*/ -23, 20 }, /* index 17: 10 bits: 011111110x */
{ 21, /*-7*/ -38 }, /* index 18: 10 bits: 011111111x */
{ /*10*/ -21, 22 }, /* index 19: 11 bits: 0111111010x */
{ 23, /*-9*/ -40 }, /* index 20: 11 bits: 0111111101x */
{ /*9*/ -22, 24 }, /* index 21: 11 bits: 0111111110x */
{ /*-11*/ -42, /*11*/ -20 }, /* index 22: 12 bits: 01111110101x */
{ 25, 26 }, /* index 23: 12 bits: 01111111010x */
{ 27, /*-10*/ -41 }, /* index 24: 12 bits: 01111111101x */
{ 28, /*-12*/ -43 }, /* index 25: 13 bits: 011111110100x */
{ /*12*/ -19, 29 }, /* index 26: 13 bits: 011111110101x */
{ 30, 31 }, /* index 27: 13 bits: 011111111010x */
{ 32, /*-14*/ -45 }, /* index 28: 14 bits: 0111111101000x */
{ /*14*/ -17, 33 }, /* index 29: 14 bits: 0111111101011x */
{ 34, /*-13*/ -44 }, /* index 30: 14 bits: 0111111110100x */
{ /*13*/ -18, 35 }, /* index 31: 14 bits: 0111111110101x */
{ 36, 37 }, /* index 32: 15 bits: 01111111010000x */
{ 38, /*-15*/ -46 }, /* index 33: 15 bits: 01111111010111x */
{ /*15*/ -16, 39 }, /* index 34: 15 bits: 01111111101000x */
{ 40, 41 }, /* index 35: 15 bits: 01111111101011x */
{ 42, 43 }, /* index 36: 16 bits: 011111110100000x */
{ /*-17*/ -48, /*17*/ -14 }, /* index 37: 16 bits: 011111110100001x */
{ 44, 45 }, /* index 38: 16 bits: 011111110101110x */
{ 46, 47 }, /* index 39: 16 bits: 011111111010001x */
{ 48, 49 }, /* index 40: 16 bits: 011111111010110x */
{ /*-16*/ -47, /*16*/ -15 }, /* index 41: 16 bits: 011111111010111x */
{ /*-21*/ -52, /*21*/ -10 }, /* index 42: 17 bits: 0111111101000000x */
{ /*-19*/ -50, /*19*/ -12 }, /* index 43: 17 bits: 0111111101000001x */
{ /*-18*/ -49, /*18*/ -13 }, /* index 44: 17 bits: 0111111101011100x */
{ 50, 51 }, /* index 45: 17 bits: 0111111101011101x */
{ 52, 53 }, /* index 46: 17 bits: 0111111110100010x */
{ 54, 55 }, /* index 47: 17 bits: 0111111110100011x */
{ 56, 57 }, /* index 48: 17 bits: 0111111110101100x */
{ 58, 59 }, /* index 49: 17 bits: 0111111110101101x */
{ /*-26*/ -57, /*-25*/ -56 }, /* index 50: 18 bits: 01111111010111010x */
{ /*-28*/ -59, /*-27*/ -58 }, /* index 51: 18 bits: 01111111010111011x */
{ /*-22*/ -53, /*22*/ -9 }, /* index 52: 18 bits: 01111111101000100x */
{ /*-24*/ -55, /*-23*/ -54 }, /* index 53: 18 bits: 01111111101000101x */
{ /*25*/ -6, /*26*/ -5 }, /* index 54: 18 bits: 01111111101000110x */
{ /*23*/ -8, /*24*/ -7 }, /* index 55: 18 bits: 01111111101000111x */
{ /*29*/ -2, /*30*/ -1 }, /* index 56: 18 bits: 01111111101011000x */
{ /*27*/ -4, /*28*/ -3 }, /* index 57: 18 bits: 01111111101011001x */
{ /*-30*/ -61, /*-29*/ -60 }, /* index 58: 18 bits: 01111111101011010x */
{ /*-20*/ -51, /*20*/ -11 } /* index 59: 18 bits: 01111111101011011x */
};
static const int8_t t_huff_iid_fine[][2] = {
{ 1, /*0*/ -31 }, /* index 0: 1 bits: x */
{ /*1*/ -30, 2 }, /* index 1: 2 bits: 0x */
{ 3, /*-1*/ -32 }, /* index 2: 3 bits: 01x */
{ 4, 5 }, /* index 3: 4 bits: 010x */
{ 6, 7 }, /* index 4: 5 bits: 0100x */
{ /*-2*/ -33, /*2*/ -29 }, /* index 5: 5 bits: 0101x */
{ 8, /*-3*/ -34 }, /* index 6: 6 bits: 01000x */
{ /*3*/ -28, 9 }, /* index 7: 6 bits: 01001x */
{ /*-4*/ -35, /*4*/ -27 }, /* index 8: 7 bits: 010000x */
{ 10, 11 }, /* index 9: 7 bits: 010011x */
{ /*5*/ -26, 12 }, /* index 10: 8 bits: 0100110x */
{ 13, 14 }, /* index 11: 8 bits: 0100111x */
{ /*-6*/ -37, /*6*/ -25 }, /* index 12: 9 bits: 01001101x */
{ 15, 16 }, /* index 13: 9 bits: 01001110x */
{ 17, /*-5*/ -36 }, /* index 14: 9 bits: 01001111x */
{ 18, /*-7*/ -38 }, /* index 15: 10 bits: 010011100x */
{ /*7*/ -24, 19 }, /* index 16: 10 bits: 010011101x */
{ 20, 21 }, /* index 17: 10 bits: 010011110x */
{ /*9*/ -22, 22 }, /* index 18: 11 bits: 0100111000x */
{ 23, 24 }, /* index 19: 11 bits: 0100111011x */
{ /*-8*/ -39, /*8*/ -23 }, /* index 20: 11 bits: 0100111100x */
{ 25, 26 }, /* index 21: 11 bits: 0100111101x */
{ /*11*/ -20, 27 }, /* index 22: 12 bits: 01001110001x */
{ 28, 29 }, /* index 23: 12 bits: 01001110110x */
{ /*-10*/ -41, /*10*/ -21 }, /* index 24: 12 bits: 01001110111x */
{ 30, 31 }, /* index 25: 12 bits: 01001111010x */
{ 32, /*-9*/ -40 }, /* index 26: 12 bits: 01001111011x */
{ 33, /*-13*/ -44 }, /* index 27: 13 bits: 010011100011x */
{ /*13*/ -18, 34 }, /* index 28: 13 bits: 010011101100x */
{ 35, 36 }, /* index 29: 13 bits: 010011101101x */
{ 37, /*-12*/ -43 }, /* index 30: 13 bits: 010011110100x */
{ /*12*/ -19, 38 }, /* index 31: 13 bits: 010011110101x */
{ 39, /*-11*/ -42 }, /* index 32: 13 bits: 010011110110x */
{ 40, 41 }, /* index 33: 14 bits: 0100111000110x */
{ 42, 43 }, /* index 34: 14 bits: 0100111011001x */
{ 44, 45 }, /* index 35: 14 bits: 0100111011010x */
{ 46, /*-15*/ -46 }, /* index 36: 14 bits: 0100111011011x */
{ /*15*/ -16, 47 }, /* index 37: 14 bits: 0100111101000x */
{ /*-14*/ -45, /*14*/ -17 }, /* index 38: 14 bits: 0100111101011x */
{ 48, 49 }, /* index 39: 14 bits: 0100111101100x */
{ /*-21*/ -52, /*-20*/ -51 }, /* index 40: 15 bits: 01001110001100x */
{ /*18*/ -13, /*19*/ -12 }, /* index 41: 15 bits: 01001110001101x */
{ /*-19*/ -50, /*-18*/ -49 }, /* index 42: 15 bits: 01001110110010x */
{ 50, 51 }, /* index 43: 15 bits: 01001110110011x */
{ 52, 53 }, /* index 44: 15 bits: 01001110110100x */
{ 54, 55 }, /* index 45: 15 bits: 01001110110101x */
{ 56, /*-17*/ -48 }, /* index 46: 15 bits: 01001110110110x */
{ /*17*/ -14, 57 }, /* index 47: 15 bits: 01001111010001x */
{ 58, /*-16*/ -47 }, /* index 48: 15 bits: 01001111011000x */
{ /*16*/ -15, 59 }, /* index 49: 15 bits: 01001111011001x */
{ /*-26*/ -57, /*26*/ -5 }, /* index 50: 16 bits: 010011101100110x */
{ /*-28*/ -59, /*-27*/ -58 }, /* index 51: 16 bits: 010011101100111x */
{ /*29*/ -2, /*30*/ -1 }, /* index 52: 16 bits: 010011101101000x */
{ /*27*/ -4, /*28*/ -3 }, /* index 53: 16 bits: 010011101101001x */
{ /*-30*/ -61, /*-29*/ -60 }, /* index 54: 16 bits: 010011101101010x */
{ /*-25*/ -56, /*25*/ -6 }, /* index 55: 16 bits: 010011101101011x */
{ /*-24*/ -55, /*24*/ -7 }, /* index 56: 16 bits: 010011101101100x */
{ /*-23*/ -54, /*23*/ -8 }, /* index 57: 16 bits: 010011110100011x */
{ /*-22*/ -53, /*22*/ -9 }, /* index 58: 16 bits: 010011110110000x */
{ /*20*/ -11, /*21*/ -10 } /* index 59: 16 bits: 010011110110011x */
};
static const int8_t f_huff_icc[][2] = {
{ /*0*/ -31, 1 }, /* index 0: 1 bits: x */
{ /*1*/ -30, 2 }, /* index 1: 2 bits: 1x */
{ /*-1*/ -32, 3 }, /* index 2: 3 bits: 11x */
{ /*2*/ -29, 4 }, /* index 3: 4 bits: 111x */
{ /*-2*/ -33, 5 }, /* index 4: 5 bits: 1111x */
{ /*3*/ -28, 6 }, /* index 5: 6 bits: 11111x */
{ /*-3*/ -34, 7 }, /* index 6: 7 bits: 111111x */
{ /*4*/ -27, 8 }, /* index 7: 8 bits: 1111111x */
{ /*5*/ -26, 9 }, /* index 8: 9 bits: 11111111x */
{ /*-4*/ -35, 10 }, /* index 9: 10 bits: 111111111x */
{ /*6*/ -25, 11 }, /* index 10: 11 bits: 1111111111x */
{ /*-5*/ -36, 12 }, /* index 11: 12 bits: 11111111111x */
{ /*7*/ -24, 13 }, /* index 12: 13 bits: 111111111111x */
{ /*-6*/ -37, /*-7*/ -38 } /* index 13: 14 bits: 1111111111111x */
};
static const int8_t t_huff_icc[][2] = {
{ /*0*/ -31, 1 }, /* index 0: 1 bits: x */
{ /*1*/ -30, 2 }, /* index 1: 2 bits: 1x */
{ /*-1*/ -32, 3 }, /* index 2: 3 bits: 11x */
{ /*2*/ -29, 4 }, /* index 3: 4 bits: 111x */
{ /*-2*/ -33, 5 }, /* index 4: 5 bits: 1111x */
{ /*3*/ -28, 6 }, /* index 5: 6 bits: 11111x */
{ /*-3*/ -34, 7 }, /* index 6: 7 bits: 111111x */
{ /*4*/ -27, 8 }, /* index 7: 8 bits: 1111111x */
{ /*-4*/ -35, 9 }, /* index 8: 9 bits: 11111111x */
{ /*5*/ -26, 10 }, /* index 9: 10 bits: 111111111x */
{ /*-5*/ -36, 11 }, /* index 10: 11 bits: 1111111111x */
{ /*6*/ -25, 12 }, /* index 11: 12 bits: 11111111111x */
{ /*-6*/ -37, 13 }, /* index 12: 13 bits: 111111111111x */
{ /*-7*/ -38, /*7*/ -24 } /* index 13: 14 bits: 1111111111111x */
};
static const int8_t f_huff_ipd[][2] = {
{ 1, /*0*/ -31 }, /* index 0: 1 bits: x */
{ 2, 3 }, /* index 1: 2 bits: 0x */
{ /*1*/ -30, 4 }, /* index 2: 3 bits: 00x */
{ 5, 6 }, /* index 3: 3 bits: 01x */
{ /*4*/ -27, /*5*/ -26 }, /* index 4: 4 bits: 001x */
{ /*3*/ -28, /*6*/ -25 }, /* index 5: 4 bits: 010x */
{ /*2*/ -29, /*7*/ -24 } /* index 6: 4 bits: 011x */
};
static const int8_t t_huff_ipd[][2] = {
{ 1, /*0*/ -31 }, /* index 0: 1 bits: x */
{ 2, 3 }, /* index 1: 2 bits: 0x */
{ 4, 5 }, /* index 2: 3 bits: 00x */
{ /*1*/ -30, /*7*/ -24 }, /* index 3: 3 bits: 01x */
{ /*5*/ -26, 6 }, /* index 4: 4 bits: 000x */
{ /*2*/ -29, /*6*/ -25 }, /* index 5: 4 bits: 001x */
{ /*4*/ -27, /*3*/ -28 } /* index 6: 5 bits: 0001x */
};
static const int8_t f_huff_opd[][2] = {
{ 1, /*0*/ -31 }, /* index 0: 1 bits: x */
{ 2, 3 }, /* index 1: 2 bits: 0x */
{ /*7*/ -24, /*1*/ -30 }, /* index 2: 3 bits: 00x */
{ 4, 5 }, /* index 3: 3 bits: 01x */
{ /*3*/ -28, /*6*/ -25 }, /* index 4: 4 bits: 010x */
{ /*2*/ -29, 6 }, /* index 5: 4 bits: 011x */
{ /*5*/ -26, /*4*/ -27 } /* index 6: 5 bits: 0111x */
};
static const int8_t t_huff_opd[][2] = {
{ 1, /*0*/ -31 }, /* index 0: 1 bits: x */
{ 2, 3 }, /* index 1: 2 bits: 0x */
{ 4, 5 }, /* index 2: 3 bits: 00x */
{ /*1*/ -30, /*7*/ -24 }, /* index 3: 3 bits: 01x */
{ /*5*/ -26, /*2*/ -29 }, /* index 4: 4 bits: 000x */
{ /*6*/ -25, 6 }, /* index 5: 4 bits: 001x */
{ /*4*/ -27, /*3*/ -28 } /* index 6: 5 bits: 0011x */
};
/* static function declarations */
static uint16_t ps_extension(ps_info *ps, bitfile *ld,
const uint8_t ps_extension_id,
const uint16_t num_bits_left);
static void huff_data(bitfile *ld, const uint8_t dt, const uint8_t nr_par,
ps_huff_tab t_huff, ps_huff_tab f_huff, int8_t *par);
static INLINE int8_t ps_huff_dec(bitfile *ld, ps_huff_tab t_huff);
uint16_t ps_data(ps_info *ps, bitfile *ld, uint8_t *header)
{
uint8_t tmp, n;
uint16_t bits = (uint16_t)faad_get_processed_bits(ld);
*header = 0;
/* check for new PS header */
if (faad_get1bit(ld
DEBUGVAR(1,1000,"ps_data(): enable_ps_header")))
{
*header = 1;
ps->header_read = 1;
ps->use34hybrid_bands = 0;
/* Inter-channel Intensity Difference (IID) parameters enabled */
ps->enable_iid = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,1001,"ps_data(): enable_iid"));
if (ps->enable_iid)
{
ps->iid_mode = (uint8_t)faad_getbits(ld, 3
DEBUGVAR(1,1002,"ps_data(): iid_mode"));
ps->nr_iid_par = nr_iid_par_tab[ps->iid_mode];
ps->nr_ipdopd_par = nr_ipdopd_par_tab[ps->iid_mode];
if (ps->iid_mode == 2 || ps->iid_mode == 5)
ps->use34hybrid_bands = 1;
/* IPD freq res equal to IID freq res */
ps->ipd_mode = ps->iid_mode;
}
/* Inter-channel Coherence (ICC) parameters enabled */
ps->enable_icc = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,1003,"ps_data(): enable_icc"));
if (ps->enable_icc)
{
ps->icc_mode = (uint8_t)faad_getbits(ld, 3
DEBUGVAR(1,1004,"ps_data(): icc_mode"));
ps->nr_icc_par = nr_icc_par_tab[ps->icc_mode];
if (ps->icc_mode == 2 || ps->icc_mode == 5)
ps->use34hybrid_bands = 1;
}
/* PS extension layer enabled */
ps->enable_ext = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,1005,"ps_data(): enable_ext"));
}
/* we are here, but no header has been read yet */
if (ps->header_read == 0)
{
ps->ps_data_available = 0;
return 1;
}
ps->frame_class = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,1006,"ps_data(): frame_class"));
tmp = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,1007,"ps_data(): num_env_idx"));
ps->num_env = num_env_tab[ps->frame_class][tmp];
if (ps->frame_class)
{
for (n = 1; n < ps->num_env+1; n++)
{
ps->border_position[n] = (uint8_t)faad_getbits(ld, 5
DEBUGVAR(1,1008,"ps_data(): border_position")) + 1;
}
}
if (ps->enable_iid)
{
for (n = 0; n < ps->num_env; n++)
{
ps->iid_dt[n] = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,1009,"ps_data(): iid_dt"));
/* iid_data */
if (ps->iid_mode < 3)
{
huff_data(ld, ps->iid_dt[n], ps->nr_iid_par, t_huff_iid_def,
f_huff_iid_def, ps->iid_index[n]);
} else {
huff_data(ld, ps->iid_dt[n], ps->nr_iid_par, t_huff_iid_fine,
f_huff_iid_fine, ps->iid_index[n]);
}
}
}
if (ps->enable_icc)
{
for (n = 0; n < ps->num_env; n++)
{
ps->icc_dt[n] = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,1010,"ps_data(): icc_dt"));
/* icc_data */
huff_data(ld, ps->icc_dt[n], ps->nr_icc_par, t_huff_icc,
f_huff_icc, ps->icc_index[n]);
}
}
if (ps->enable_ext)
{
uint16_t num_bits_left;
uint16_t cnt = (uint16_t)faad_getbits(ld, 4
DEBUGVAR(1,1011,"ps_data(): ps_extension_size"));
if (cnt == 15)
{
cnt += (uint16_t)faad_getbits(ld, 8
DEBUGVAR(1,1012,"ps_data(): esc_count"));
}
num_bits_left = 8 * cnt;
while (num_bits_left > 7)
{
uint8_t ps_extension_id = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,1013,"ps_data(): ps_extension_size"));
num_bits_left -= 2;
num_bits_left -= ps_extension(ps, ld, ps_extension_id, num_bits_left);
}
faad_getbits(ld, num_bits_left
DEBUGVAR(1,1014,"ps_data(): fill_bits"));
}
bits = (uint16_t)faad_get_processed_bits(ld) - bits;
ps->ps_data_available = 1;
return bits;
}
static uint16_t ps_extension(ps_info *ps, bitfile *ld,
const uint8_t ps_extension_id,
const uint16_t num_bits_left)
{
uint8_t n;
uint16_t bits = (uint16_t)faad_get_processed_bits(ld);
if (ps_extension_id == 0)
{
ps->enable_ipdopd = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,1015,"ps_extension(): enable_ipdopd"));
if (ps->enable_ipdopd)
{
for (n = 0; n < ps->num_env; n++)
{
ps->ipd_dt[n] = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,1016,"ps_extension(): ipd_dt"));
/* ipd_data */
huff_data(ld, ps->ipd_dt[n], ps->nr_ipdopd_par, t_huff_ipd,
f_huff_ipd, ps->ipd_index[n]);
ps->opd_dt[n] = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,1017,"ps_extension(): opd_dt"));
/* opd_data */
huff_data(ld, ps->opd_dt[n], ps->nr_ipdopd_par, t_huff_opd,
f_huff_opd, ps->opd_index[n]);
}
}
faad_get1bit(ld
DEBUGVAR(1,1018,"ps_extension(): reserved_ps"));
}
/* return number of bits read */
bits = (uint16_t)faad_get_processed_bits(ld) - bits;
return bits;
}
/* read huffman data coded in either the frequency or the time direction */
static void huff_data(bitfile *ld, const uint8_t dt, const uint8_t nr_par,
ps_huff_tab t_huff, ps_huff_tab f_huff, int8_t *par)
{
uint8_t n;
if (dt)
{
/* coded in time direction */
for (n = 0; n < nr_par; n++)
{
par[n] = ps_huff_dec(ld, t_huff);
}
} else {
/* coded in frequency direction */
par[0] = ps_huff_dec(ld, f_huff);
for (n = 1; n < nr_par; n++)
{
par[n] = ps_huff_dec(ld, f_huff);
}
}
}
/* binary search huffman decoding */
static INLINE int8_t ps_huff_dec(bitfile *ld, ps_huff_tab t_huff)
{
uint8_t bit;
int16_t index = 0;
while (index >= 0)
{
bit = (uint8_t)faad_get1bit(ld);
index = t_huff[index][bit];
}
return index + 31;
}
#endif