/*

 *      encoder.h include file

 *

 *      Copyright (c) 2000 Mark Taylor

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 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

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library 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.

 */

#ifndef LAME_ENCODER_H

#define LAME_ENCODER_H

/***********************************************************************

*

*  encoder and decoder delays

*

***********************************************************************/

/* 

 * layer III enc->dec delay:  1056 (1057?)   (observed)

 * layer  II enc->dec delay:   480  (481?)   (observed)

 *

 * polyphase 256-16             (dec or enc)        = 240

 * mdct      256+32  (9*32)     (dec or enc)        = 288

 * total:    512+16

 *

 * My guess is that delay of polyphase filterbank is actualy 240.5

 * (there are technical reasons for this, see postings in mp3encoder).

 * So total Encode+Decode delay = ENCDELAY + 528 + 1

 */

/* 

 * ENCDELAY  The encoder delay.  

 *

 * Minimum allowed is MDCTDELAY (see below)

 *  

 * The first 96 samples will be attenuated, so using a value less than 96

 * will result in corrupt data for the first 96-ENCDELAY samples.

 *

 * suggested: 576

 * set to 1160 to sync with FhG.

 */

#define ENCDELAY      576

/*

 * make sure there is at least one complete frame after the

 * last frame containing real data

 *

 * Using a value of 288 would be sufficient for a 

 * a very sophisticated decoder that can decode granule-by-granule instead

 * of frame by frame.  But lets not assume this, and assume the decoder  

 * will not decode frame N unless it also has data for frame N+1

 *

 */

/*#define POSTDELAY   288*/

#define POSTDELAY   1152

/* 

 * delay of the MDCT used in mdct.c

 * original ISO routines had a delay of 528!  

 * Takehiro's routines: 

 */

#define MDCTDELAY     48

#define FFTOFFSET     (224+MDCTDELAY)

/*

 * Most decoders, including the one we use, have a delay of 528 samples.  

 */

#define DECDELAY      528

/* number of subbands */

#define SBLIMIT       32

/* parition bands bands */

#define CBANDS        64

/* number of critical bands/scale factor bands where masking is computed*/

#define SBPSY_l       21

#define SBPSY_s       12

/* total number of scalefactor bands encoded */

#define SBMAX_l       22

#define SBMAX_s       13

#define PSFB21         6

#define PSFB12         6

/* FFT sizes */

#define BLKSIZE       1024

#define HBLKSIZE      (BLKSIZE/2 + 1)

#define BLKSIZE_s     256

#define HBLKSIZE_s    (BLKSIZE_s/2 + 1)

/* #define switch_pe        1800 */

#define NORM_TYPE     0

#define START_TYPE    1

#define SHORT_TYPE    2

#define STOP_TYPE     3

/* 

 * Mode Extention:

 * When we are in stereo mode, there are 4 possible methods to store these

 * two channels. The stereo modes -m? are using a subset of them.

 *

 *  -ms: MPG_MD_LR_LR

 *  -mj: MPG_MD_LR_LR and MPG_MD_MS_LR

 *  -mf: MPG_MD_MS_LR

 *  -mi: all

 */

#if 0

#define MPG_MD_LR_LR  0

#define MPG_MD_LR_I   1

#define MPG_MD_MS_LR  2

#define MPG_MD_MS_I   3

#endif

enum MPEGChannelMode

{   MPG_MD_LR_LR = 0

,   MPG_MD_LR_I  = 1

,   MPG_MD_MS_LR = 2

,   MPG_MD_MS_I  = 3

};

#ifndef lame_internal_flags_defined

#define lame_internal_flags_defined

struct lame_internal_flags;

typedef struct lame_internal_flags lame_internal_flags;

#endif

int     lame_encode_mp3_frame(lame_internal_flags * gfc,

                              sample_t const *inbuf_l,

                              sample_t const *inbuf_r, unsigned char *mp3buf, int mp3buf_size);

#endif /* LAME_ENCODER_H */