2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg 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.
11 * FFmpeg 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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * mpeg audio declarations for both encoder and decoder.
26 #ifndef AVCODEC_MPEGAUDIO_H
27 #define AVCODEC_MPEGAUDIO_H
34 #include "libavutil/internal.h"
36 /* max frame size, in samples */
37 #define MPA_FRAME_SIZE 1152
39 /* max compressed frame size */
40 #define MPA_MAX_CODED_FRAME_SIZE 1792
42 #define MPA_MAX_CHANNELS 2
44 #define SBLIMIT 32 /* number of subbands */
52 #define FRAC_BITS 23 /* fractional bits for sb_samples and dct */
53 #define WFRAC_BITS 16 /* fractional bits for window */
56 #define IMDCT_SCALAR 1.759
58 #define FRAC_ONE (1 << FRAC_BITS)
60 #define FIX(a) ((int)((a) * FRAC_ONE))
63 # define INTFLOAT float
64 # define SUINTFLOAT float
65 typedef float MPA_INT;
66 typedef float OUT_INT;
69 # define SUINTFLOAT SUINT
70 typedef int16_t MPA_INT;
71 typedef int16_t OUT_INT;
74 # define SUINTFLOAT SUINT
75 typedef int32_t MPA_INT;
76 typedef int16_t OUT_INT;
79 int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
81 #endif /* AVCODEC_MPEGAUDIO_H */