yading@10: /*
yading@10:  * copyright (c) 2001 Fabrice Bellard
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * mpeg audio declarations for both encoder and decoder.
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_MPEGAUDIO_H
yading@10: #define AVCODEC_MPEGAUDIO_H
yading@10: 
yading@10: #ifndef CONFIG_FLOAT
yading@10: #   define CONFIG_FLOAT 0
yading@10: #endif
yading@10: 
yading@10: #include <stdint.h>
yading@10: 
yading@10: /* max frame size, in samples */
yading@10: #define MPA_FRAME_SIZE 1152
yading@10: 
yading@10: /* max compressed frame size */
yading@10: #define MPA_MAX_CODED_FRAME_SIZE 1792
yading@10: 
yading@10: #define MPA_MAX_CHANNELS 2
yading@10: 
yading@10: #define SBLIMIT 32 /* number of subbands */
yading@10: 
yading@10: #define MPA_STEREO  0
yading@10: #define MPA_JSTEREO 1
yading@10: #define MPA_DUAL    2
yading@10: #define MPA_MONO    3
yading@10: 
yading@10: #ifndef FRAC_BITS
yading@10: #define FRAC_BITS   23   /* fractional bits for sb_samples and dct */
yading@10: #define WFRAC_BITS  16   /* fractional bits for window */
yading@10: #endif
yading@10: 
yading@10: #define IMDCT_SCALAR 1.759
yading@10: 
yading@10: #define FRAC_ONE    (1 << FRAC_BITS)
yading@10: 
yading@10: #define FIX(a)   ((int)((a) * FRAC_ONE))
yading@10: 
yading@10: #if CONFIG_FLOAT
yading@10: #   define INTFLOAT float
yading@10: typedef float MPA_INT;
yading@10: typedef float OUT_INT;
yading@10: #elif FRAC_BITS <= 15
yading@10: #   define INTFLOAT int
yading@10: typedef int16_t MPA_INT;
yading@10: typedef int16_t OUT_INT;
yading@10: #else
yading@10: #   define INTFLOAT int
yading@10: typedef int32_t MPA_INT;
yading@10: typedef int16_t OUT_INT;
yading@10: #endif
yading@10: 
yading@10: int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
yading@10: 
yading@10: #endif /* AVCODEC_MPEGAUDIO_H */