/* encoder.h include file
* Copyright (c) 2000 Mark Taylor
*/
#pragma once
/***********************************************************************
*
* 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
*/
enum MPEGChannelMode {
MPG_MD_LR_LR,
MPG_MD_LR_I,
MPG_MD_MS_LR,
MPG_MD_MS_I
};
#ifndef lame_internal_flags_defined
#define lame_internal_flags_defined
struct lame_internal_flags;
typedef struct lame_internal_flags lame_internal_flags;
#endif
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