ref: c1d40df49550393f3afe53fb6e6d500dfa8eb7a8
dir: /sys/src/cmd/audio/mp3enc/encoder.h/
/* * 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 /* * 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 /* 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 */ #define MPG_MD_LR_LR 0 #define MPG_MD_LR_I 1 #define MPG_MD_MS_LR 2 #define MPG_MD_MS_I 3 #include "machine.h" #include "lame.h" int lame_encode_mp3_frame ( lame_global_flags* const gfp, sample_t* inbuf_l, sample_t* inbuf_r, unsigned char* mp3buf, int mp3buf_size ); #endif /* LAME_ENCODER_H */