ref: 3501993184b7b711ab99d442ac651a6fb1310b6f
dir: /libfaad/syntax.h/
/*
** FAAD - Freeware Advanced Audio Decoder
** Copyright (C) 2002 M. Bakker
**
** 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.
**
** $Id: syntax.h,v 1.2 2002/01/19 09:39:41 menno Exp $
**/
#ifndef __SYNTAX_H__
#define __SYNTAX_H__
#ifdef __cplusplus
extern "C" {
#endif
#include "bits.h"
#define MAIN 0
#define LC 1
#define SSR 2
#define LTP 3
/* Bitstream */
#define LEN_SE_ID 3
#define LEN_TAG 4
#define LEN_BYTE 8
#define EXT_FILL_DATA 1
#define EXT_DYNAMIC_RANGE 11
/* Syntax elements */
#define ID_SCE 0x0
#define ID_CPE 0x1
#define ID_CCE 0x2
#define ID_LFE 0x3
#define ID_DSE 0x4
#define ID_PCE 0x5
#define ID_FIL 0x6
#define ID_END 0x7
#define MAX_CHANNELS 64
#define MAX_SYNTAX_ELEMENTS 48
#define MAX_WINDOW_GROUPS 8
#define MAX_SFB 51
#define MAX_LTP_SFB 40
#define MAX_LTP_SFB_S 8
#define ONLY_LONG_SEQUENCE 0x0
#define LONG_START_SEQUENCE 0x1
#define EIGHT_SHORT_SEQUENCE 0x2
#define LONG_STOP_SEQUENCE 0x3
#define ZERO_HCB 0
#define FIRST_PAIR_HCB 5
#define ESC_HCB 11
#define QUAD_LEN 4
#define PAIR_LEN 2
#define NSPECBOOKS ESC_HCB + 1
#define BOOKSCL NSPECBOOKS
#define NOISE_HCB 13
#define INTENSITY_HCB2 14
#define INTENSITY_HCB 15
typedef struct
{
int element_instance_tag;
int object_type;
int sf_index;
int num_front_channel_elements;
int num_side_channel_elements;
int num_back_channel_elements;
int num_lfe_channel_elements;
int num_assoc_data_elements;
int num_valid_cc_elements;
int mono_mixdown_present;
int mono_mixdown_element_number;
int stereo_mixdown_present;
int stereo_mixdown_element_number;
int matrix_mixdown_idx_present;
int pseudo_surround_enable;
int matrix_mixdown_idx;
int front_element_is_cpe[16];
int front_element_tag_select[16];
int side_element_is_cpe[16];
int side_element_tag_select[16];
int back_element_is_cpe[16];
int back_element_tag_select[16];
int lfe_element_tag_select[16];
int assoc_data_element_tag_select[16];
int cc_element_is_ind_sw[16];
int valid_cc_element_tag_select[16];
int channels;
int comment_field_bytes;
unsigned char comment_field_data[257];
} program_config;
typedef struct
{
int syncword;
int id;
int layer;
int protection_absent;
int profile;
int sf_index;
int private_bit;
int channel_configuration;
int original;
int home;
int emphasis;
int copyright_identification_bit;
int copyright_identification_start;
int aac_frame_length;
int adts_buffer_fullness;
int no_raw_data_blocks_in_frame;
int crc_check;
} adts_header;
typedef struct
{
int copyright_id_present;
char copyright_id[10];
int original_copy;
int home;
int bitstream_type;
int bitrate;
int num_program_config_elements;
int adif_buffer_fullness;
program_config pce;
} adif_header;
typedef struct
{
int last_band;
int data_present;
int lag;
int coef;
int short_used[8];
int short_lag_present[8];
int short_lag[8];
int long_used[51];
} ltp_info;
typedef struct
{
int limit;
int predictor_reset;
int predictor_reset_group_number;
int prediction_used[41];
} pred_info;
typedef struct
{
int number_pulse;
int pulse_start_sfb;
int pulse_offset[4];
int pulse_amp[4];
} pulse_info;
typedef struct
{
int n_filt[8];
int coef_res[8];
int length[8][4];
int order[8][4];
int direction[8][4];
int coef_compress[8][4];
int coef[8][4][32];
} tns_info;
typedef struct
{
float ctrl1;
float ctrl2;
int present;
int num_bands;
int pce_instance_tag;
int excluded_chns_present;
int band_top[17];
int prog_ref_level;
int dyn_rng_sgn[17];
int dyn_rng_ctl[17];
int exclude_mask[MAX_CHANNELS];
int additional_excluded_chns[MAX_CHANNELS];
} drc_info;
typedef struct
{
int max_sfb;
int num_swb;
int num_window_groups;
int num_windows;
int window_sequence;
int window_group_length[8];
int window_shape;
int scale_factor_grouping;
int sect_sfb_offset[8][15*8];
int swb_offset[51];
int sect_cb[8][15*8];
int sect_start[8][15*8];
int sect_end[8][15*8];
int sfb_cb[8][8*15];
int num_sec[8]; /* number of sections in a group */
int global_gain;
int ms_mask_present;
int ms_used[MAX_WINDOW_GROUPS][MAX_SFB];
int pulse_data_present;
int tns_data_present;
int gain_control_data_present;
int predictor_data_present;
int scale_factors[8][51];
pulse_info pul;
tns_info tns;
pred_info pred;
ltp_info ltp;
ltp_info ltp2;
} ic_stream; /* individual channel stream */
typedef struct
{
int ele_id;
int channel;
int paired_channel;
int element_instance_tag;
int common_window;
ic_stream ics1;
ic_stream ics2;
} element; /* syntax element (SCE, CPE, LFE) */
int single_lfe_channel_element(element *sce, bitfile *ld, short *spec_data,
int sf_index, int object_type);
int channel_pair_element(element *cpe, bitfile *ld, short *spec_data1,
short *spec_data2, int sf_index, int object_type);
int data_stream_element(bitfile *ld);
int program_config_element(program_config *pce, bitfile *ld);
int fill_element(bitfile *ld, drc_info *drc);
int adts_frame(adts_header *adts, bitfile *ld);
void get_adif_header(adif_header *adif, bitfile *ld);
/* static functions */
static int individual_channel_stream(element *ele, bitfile *ld,
ic_stream *ics, int scal_flag,
short *spec_data, int sf_index,
int object_type);
static int ics_info(ic_stream *ics, bitfile *ld,
int common_window, int fs_index, int object_type);
static void section_data(ic_stream *ics, bitfile *ld);
static int scale_factor_data(ic_stream *ics, bitfile *ld);
static int spectral_data(ic_stream *ics, bitfile *ld, short *spectral_data);
static int extension_payload(bitfile *ld, drc_info *drc, int count);
static void pulse_data(pulse_info *pul, bitfile *ld);
static void tns_data(ic_stream *ics, tns_info *tns, bitfile *ld);
static void ltp_data(ic_stream *ics, ltp_info *ltp, bitfile *ld);
static int adts_fixed_header(adts_header *adts, bitfile *ld);
static void adts_variable_header(adts_header *adts, bitfile *ld);
static void adts_error_check(adts_header *adts, bitfile *ld);
static int dynamic_range_info(bitfile *ld, drc_info *drc);
static int excluded_channels(bitfile *ld, drc_info *drc);
#ifdef __cplusplus
}
#endif
#endif