shithub: aacenc

ref: 2fbc12a1a1ee88dc8e023bcdb71a6e6f440781aa
dir: /libfaac/coder.h/

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/*
 * 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 1.3 2001/02/28 18:39:34 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
};

/* Added TNS defines and structures here to get it to compile */
#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

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;
/* End of TNS defines and structures */


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;

	TnsInfo tnsInfo;

} 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 */