ref: 695a501740c4271dce621bff17cc64dec8a480df
dir: /libfaac/coder.h/
/*
* FAAC - Freeware Advanced Audio Coder
* Copyright (C) 2001 Menno 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: coder.h,v 1.4 2001/03/05 11:33:37 menno Exp $
*/
#ifndef CODER_H
#define CODER_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define MAX_CHANNELS 64
#define FRAME_LEN 1024
#define NSFB_LONG 51
#define NSFB_SHORT 15
#define MAX_SHORT_WINDOWS 8
#define BLOCK_LEN_LONG 1024
#define BLOCK_LEN_SHORT 128
#define MAX_SCFAC_BANDS ((NSFB_SHORT+1)*MAX_SHORT_WINDOWS)
enum WINDOW_TYPE {
ONLY_LONG_WINDOW,
LONG_SHORT_WINDOW,
ONLY_SHORT_WINDOW,
SHORT_LONG_WINDOW
};
#define TNS_MAX_ORDER 20
#define DEF_TNS_GAIN_THRESH 1.4
#define DEF_TNS_COEFF_THRESH 0.1
#define DEF_TNS_COEFF_RES 4
#define DEF_TNS_RES_OFFSET 3
#define LEN_TNS_NFILTL 2
#define LEN_TNS_NFILTS 1
#define LPC 1
#define DELAY 2048
#define LEN_LTP_DATA_PRESENT 1
#define LEN_LTP_LAG 11
#define LEN_LTP_COEF 3
#define LEN_LTP_SHORT_USED 1
#define LEN_LTP_SHORT_LAG_PRESENT 1
#define LEN_LTP_SHORT_LAG 5
#define LTP_LAG_OFFSET 16
#define LEN_LTP_LONG_USED 1
#define MAX_LT_PRED_LONG_SFB 40
#define MAX_LT_PRED_SHORT_SFB 13
#define SHORT_SQ_OFFSET (BLOCK_LEN_LONG-(BLOCK_LEN_SHORT*4+BLOCK_LEN_SHORT/2))
#define CODESIZE 8
#define NOK_LT_BLEN (3 * BLOCK_LEN_LONG)
typedef struct {
int order; /* Filter order */
int direction; /* Filtering direction */
int coefCompress; /* Are coeffs compressed? */
int length; /* Length, in bands */
double aCoeffs[TNS_MAX_ORDER+1]; /* AR Coefficients */
double kCoeffs[TNS_MAX_ORDER+1]; /* Reflection Coefficients */
int index[TNS_MAX_ORDER+1]; /* Coefficient indices */
} TnsFilterData;
typedef struct {
int numFilters; /* Number of filters */
int coefResolution; /* Coefficient resolution */
TnsFilterData tnsFilter[1<<LEN_TNS_NFILTL]; /* TNS filters */
} TnsWindowData;
typedef struct {
int tnsDataPresent;
int tnsMinBandNumberLong;
int tnsMinBandNumberShort;
int tnsMaxBandsLong;
int tnsMaxBandsShort;
int tnsMaxOrderLong;
int tnsMaxOrderShort;
TnsWindowData windowData[MAX_SHORT_WINDOWS]; /* TNS data per window */
} TnsInfo;
typedef struct
{
int weight_idx;
double weight;
int sbk_prediction_used[MAX_SHORT_WINDOWS];
int sfb_prediction_used[MAX_SCFAC_BANDS];
int delay[MAX_SHORT_WINDOWS];
int global_pred_flag;
int side_info;
short *buffer;
double *mdct_predicted;
double *time_buffer;
double *ltp_overlap_buffer;
} LtpInfo;
typedef struct {
int window_shape;
int prev_window_shape;
int block_type;
int desired_block_type;
int global_gain;
int old_value;
int CurrentStep;
int scale_factor[MAX_SCFAC_BANDS];
int num_window_groups;
int window_group_length[8];
int max_sfb;
int nr_of_sfb;
int sfb_offset[250];
int spectral_count;
/* Huffman codebook selected for each sf band */
int book_vector[MAX_SCFAC_BANDS];
/* Data of spectral bitstream elements, for each spectral pair,
5 elements are required: 1*(esc)+2*(sign)+2*(esc value)=5 */
int *data;
/* Lengths of spectral bitstream elements */
int *len;
/* Holds the requantized spectrum */
double *requantFreq;
TnsInfo tnsInfo;
LtpInfo ltpInfo;
} CoderInfo;
typedef struct {
unsigned long sampling_rate; /* the following entries are for this sampling rate */
int num_cb_long;
int num_cb_short;
int cb_width_long[NSFB_LONG];
int cb_width_short[NSFB_SHORT];
} SR_INFO;
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* CODER_H */