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