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