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81 lines
2.0 KiB
81 lines
2.0 KiB
/* |
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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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