157 lines
4.0 KiB
C
157 lines
4.0 KiB
C
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/*
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* encoder.h include file
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*
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* Copyright (c) 2000 Mark Taylor
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef LAME_ENCODER_H
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#define LAME_ENCODER_H
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/***********************************************************************
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*
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* encoder and decoder delays
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*
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***********************************************************************/
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/*
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* layer III enc->dec delay: 1056 (1057?) (observed)
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* layer II enc->dec delay: 480 (481?) (observed)
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*
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* polyphase 256-16 (dec or enc) = 240
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* mdct 256+32 (9*32) (dec or enc) = 288
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* total: 512+16
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*
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* My guess is that delay of polyphase filterbank is actualy 240.5
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* (there are technical reasons for this, see postings in mp3encoder).
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* So total Encode+Decode delay = ENCDELAY + 528 + 1
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*/
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/*
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* ENCDELAY The encoder delay.
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*
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* Minimum allowed is MDCTDELAY (see below)
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*
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* The first 96 samples will be attenuated, so using a value less than 96
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* will result in corrupt data for the first 96-ENCDELAY samples.
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*
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* suggested: 576
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* set to 1160 to sync with FhG.
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*/
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#define ENCDELAY 576
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/*
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* make sure there is at least one complete frame after the
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* last frame containing real data
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*
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* Using a value of 288 would be sufficient for a
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* a very sophisticated decoder that can decode granule-by-granule instead
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* of frame by frame. But lets not assume this, and assume the decoder
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* will not decode frame N unless it also has data for frame N+1
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*
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*/
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/*#define POSTDELAY 288*/
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#define POSTDELAY 1152
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/*
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* delay of the MDCT used in mdct.c
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* original ISO routines had a delay of 528!
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* Takehiro's routines:
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*/
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#define MDCTDELAY 48
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#define FFTOFFSET (224+MDCTDELAY)
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/*
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* Most decoders, including the one we use, have a delay of 528 samples.
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*/
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#define DECDELAY 528
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/* number of subbands */
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#define SBLIMIT 32
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/* parition bands bands */
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#define CBANDS 64
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/* number of critical bands/scale factor bands where masking is computed*/
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#define SBPSY_l 21
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#define SBPSY_s 12
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/* total number of scalefactor bands encoded */
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#define SBMAX_l 22
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#define SBMAX_s 13
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#define PSFB21 6
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#define PSFB12 6
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/* FFT sizes */
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#define BLKSIZE 1024
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#define HBLKSIZE (BLKSIZE/2 + 1)
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#define BLKSIZE_s 256
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#define HBLKSIZE_s (BLKSIZE_s/2 + 1)
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/* #define switch_pe 1800 */
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#define NORM_TYPE 0
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#define START_TYPE 1
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#define SHORT_TYPE 2
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#define STOP_TYPE 3
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/*
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* Mode Extention:
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* When we are in stereo mode, there are 4 possible methods to store these
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* two channels. The stereo modes -m? are using a subset of them.
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*
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* -ms: MPG_MD_LR_LR
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* -mj: MPG_MD_LR_LR and MPG_MD_MS_LR
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* -mf: MPG_MD_MS_LR
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* -mi: all
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*/
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#if 0
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#define MPG_MD_LR_LR 0
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#define MPG_MD_LR_I 1
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#define MPG_MD_MS_LR 2
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#define MPG_MD_MS_I 3
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#endif
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enum MPEGChannelMode
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{ MPG_MD_LR_LR = 0
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, MPG_MD_LR_I = 1
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, MPG_MD_MS_LR = 2
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, MPG_MD_MS_I = 3
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};
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#ifndef lame_internal_flags_defined
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#define lame_internal_flags_defined
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struct lame_internal_flags;
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typedef struct lame_internal_flags lame_internal_flags;
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#endif
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int lame_encode_mp3_frame(lame_internal_flags * gfc,
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sample_t const *inbuf_l,
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sample_t const *inbuf_r, unsigned char *mp3buf, int mp3buf_size);
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#endif /* LAME_ENCODER_H */
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