/* * copyright (c) 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * mpeg audio declarations for both encoder and decoder. */ #ifndef AVCODEC_MPEGAUDIO_H #define AVCODEC_MPEGAUDIO_H #ifndef USE_FLOATS # define USE_FLOATS 0 #endif #include <stdint.h> #include "libavutil/internal.h" /* max frame size, in samples */ #define MPA_FRAME_SIZE 1152 /* max compressed frame size */ #define MPA_MAX_CODED_FRAME_SIZE 1792 #define MPA_MAX_CHANNELS 2 #define SBLIMIT 32 /* number of subbands */ #define MPA_STEREO 0 #define MPA_JSTEREO 1 #define MPA_DUAL 2 #define MPA_MONO 3 #ifndef FRAC_BITS #define FRAC_BITS 23 /* fractional bits for sb_samples and dct */ #define WFRAC_BITS 16 /* fractional bits for window */ #endif #define IMDCT_SCALAR 1.759 #define FRAC_ONE (1 << FRAC_BITS) #define FIX(a) ((int)((a) * FRAC_ONE)) #if USE_FLOATS # define INTFLOAT float # define SUINTFLOAT float typedef float MPA_INT; typedef float OUT_INT; #elif FRAC_BITS <= 15 # define INTFLOAT int # define SUINTFLOAT SUINT typedef int16_t MPA_INT; typedef int16_t OUT_INT; #else # define INTFLOAT int # define SUINTFLOAT SUINT typedef int32_t MPA_INT; typedef int16_t OUT_INT; #endif int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf); #endif /* AVCODEC_MPEGAUDIO_H */