1cabdff1aSopenharmony_ci/* 2cabdff1aSopenharmony_ci * copyright (c) 2001 Fabrice Bellard 3cabdff1aSopenharmony_ci * 4cabdff1aSopenharmony_ci * This file is part of FFmpeg. 5cabdff1aSopenharmony_ci * 6cabdff1aSopenharmony_ci * FFmpeg is free software; you can redistribute it and/or 7cabdff1aSopenharmony_ci * modify it under the terms of the GNU Lesser General Public 8cabdff1aSopenharmony_ci * License as published by the Free Software Foundation; either 9cabdff1aSopenharmony_ci * version 2.1 of the License, or (at your option) any later version. 10cabdff1aSopenharmony_ci * 11cabdff1aSopenharmony_ci * FFmpeg is distributed in the hope that it will be useful, 12cabdff1aSopenharmony_ci * but WITHOUT ANY WARRANTY; without even the implied warranty of 13cabdff1aSopenharmony_ci * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14cabdff1aSopenharmony_ci * Lesser General Public License for more details. 15cabdff1aSopenharmony_ci * 16cabdff1aSopenharmony_ci * You should have received a copy of the GNU Lesser General Public 17cabdff1aSopenharmony_ci * License along with FFmpeg; if not, write to the Free Software 18cabdff1aSopenharmony_ci * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19cabdff1aSopenharmony_ci */ 20cabdff1aSopenharmony_ci 21cabdff1aSopenharmony_ci/** 22cabdff1aSopenharmony_ci * @file 23cabdff1aSopenharmony_ci * mpeg audio declarations for both encoder and decoder. 24cabdff1aSopenharmony_ci */ 25cabdff1aSopenharmony_ci 26cabdff1aSopenharmony_ci#ifndef AVCODEC_MPEGAUDIO_H 27cabdff1aSopenharmony_ci#define AVCODEC_MPEGAUDIO_H 28cabdff1aSopenharmony_ci 29cabdff1aSopenharmony_ci#ifndef USE_FLOATS 30cabdff1aSopenharmony_ci# define USE_FLOATS 0 31cabdff1aSopenharmony_ci#endif 32cabdff1aSopenharmony_ci 33cabdff1aSopenharmony_ci#include <stdint.h> 34cabdff1aSopenharmony_ci#include "libavutil/internal.h" 35cabdff1aSopenharmony_ci 36cabdff1aSopenharmony_ci/* max frame size, in samples */ 37cabdff1aSopenharmony_ci#define MPA_FRAME_SIZE 1152 38cabdff1aSopenharmony_ci 39cabdff1aSopenharmony_ci/* max compressed frame size */ 40cabdff1aSopenharmony_ci#define MPA_MAX_CODED_FRAME_SIZE 1792 41cabdff1aSopenharmony_ci 42cabdff1aSopenharmony_ci#define MPA_MAX_CHANNELS 2 43cabdff1aSopenharmony_ci 44cabdff1aSopenharmony_ci#define SBLIMIT 32 /* number of subbands */ 45cabdff1aSopenharmony_ci 46cabdff1aSopenharmony_ci#define MPA_STEREO 0 47cabdff1aSopenharmony_ci#define MPA_JSTEREO 1 48cabdff1aSopenharmony_ci#define MPA_DUAL 2 49cabdff1aSopenharmony_ci#define MPA_MONO 3 50cabdff1aSopenharmony_ci 51cabdff1aSopenharmony_ci#ifndef FRAC_BITS 52cabdff1aSopenharmony_ci#define FRAC_BITS 23 /* fractional bits for sb_samples and dct */ 53cabdff1aSopenharmony_ci#define WFRAC_BITS 16 /* fractional bits for window */ 54cabdff1aSopenharmony_ci#endif 55cabdff1aSopenharmony_ci 56cabdff1aSopenharmony_ci#define IMDCT_SCALAR 1.759 57cabdff1aSopenharmony_ci 58cabdff1aSopenharmony_ci#define FRAC_ONE (1 << FRAC_BITS) 59cabdff1aSopenharmony_ci 60cabdff1aSopenharmony_ci#define FIX(a) ((int)((a) * FRAC_ONE)) 61cabdff1aSopenharmony_ci 62cabdff1aSopenharmony_ci#if USE_FLOATS 63cabdff1aSopenharmony_ci# define INTFLOAT float 64cabdff1aSopenharmony_ci# define SUINTFLOAT float 65cabdff1aSopenharmony_citypedef float MPA_INT; 66cabdff1aSopenharmony_citypedef float OUT_INT; 67cabdff1aSopenharmony_ci#elif FRAC_BITS <= 15 68cabdff1aSopenharmony_ci# define INTFLOAT int 69cabdff1aSopenharmony_ci# define SUINTFLOAT SUINT 70cabdff1aSopenharmony_citypedef int16_t MPA_INT; 71cabdff1aSopenharmony_citypedef int16_t OUT_INT; 72cabdff1aSopenharmony_ci#else 73cabdff1aSopenharmony_ci# define INTFLOAT int 74cabdff1aSopenharmony_ci# define SUINTFLOAT SUINT 75cabdff1aSopenharmony_citypedef int32_t MPA_INT; 76cabdff1aSopenharmony_citypedef int16_t OUT_INT; 77cabdff1aSopenharmony_ci#endif 78cabdff1aSopenharmony_ci 79cabdff1aSopenharmony_ciint ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf); 80cabdff1aSopenharmony_ci 81cabdff1aSopenharmony_ci#endif /* AVCODEC_MPEGAUDIO_H */ 82