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/*
* FAAC - Freeware Advanced Audio Coder
* Copyright (C) 2001 Menno Bakker
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: coder.h,v 1.13 2005/02/02 07:49:10 sur Exp $
*/
#ifndef CODER_H
#define CODER_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* Allow encoding of Digital Radio Mondiale (DRM) */
//#define DRM
/* Allow encoding of Digital Radio Mondiale (DRM) with transform length 1024 */
//#define DRM_1024
#define MAX_CHANNELS 64
#ifdef DRM
#ifdef DRM_1024
# define FRAME_LEN 1024
# define BLOCK_LEN_LONG 1024
# define BLOCK_LEN_SHORT 128
#else
# define FRAME_LEN 960
# define BLOCK_LEN_LONG 960
# define BLOCK_LEN_SHORT 120
#endif /* DRM_1024 */
#else
# define FRAME_LEN 1024
# define BLOCK_LEN_LONG 1024
# define BLOCK_LEN_SHORT 128
#endif
#define NSFB_LONG 51
#define NSFB_SHORT 15
#define MAX_SHORT_WINDOWS 8
#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 2
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 window_shape;
int prev_window_shape;
int block_type;
int desired_block_type;
int global_gain;
int sf[MAX_SCFAC_BANDS];
int book[MAX_SCFAC_BANDS];
int bandcnt;
int sfbn;
int sfb_offset[NSFB_LONG + 1];
struct {
int n;
int len[MAX_SHORT_WINDOWS];
} groups;
/* worst case: one codeword with two escapes per two spectral lines */
#define DATASIZE (3*FRAME_LEN/2)
struct {
int data;
int len;
} s[DATASIZE];
int datacnt;
#ifdef DRM
int num_data_cw[FRAME_LEN];
int cur_cw;
int all_sfb;
int iLenLongestCW;
int iLenReordSpData;
#endif
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 */
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