blob: 74590a8e8b76499845b495127fcc81ce1500c459
| 1 | /* |
| 2 | * copyright (c) 2001 Fabrice Bellard |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 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. |
| 10 | * |
| 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. |
| 15 | * |
| 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 |
| 19 | */ |
| 20 | |
| 21 | /** |
| 22 | * @file |
| 23 | * mpeg audio declarations for both encoder and decoder. |
| 24 | */ |
| 25 | |
| 26 | #ifndef AVCODEC_MPEGAUDIO_H |
| 27 | #define AVCODEC_MPEGAUDIO_H |
| 28 | |
| 29 | #ifndef USE_FLOATS |
| 30 | # define USE_FLOATS 0 |
| 31 | #endif |
| 32 | |
| 33 | #include <stdint.h> |
| 34 | #include "libavutil/internal.h" |
| 35 | |
| 36 | /* max frame size, in samples */ |
| 37 | #define MPA_FRAME_SIZE 1152 |
| 38 | |
| 39 | /* max compressed frame size */ |
| 40 | #define MPA_MAX_CODED_FRAME_SIZE 1792 |
| 41 | |
| 42 | #define MPA_MAX_CHANNELS 2 |
| 43 | |
| 44 | #define SBLIMIT 32 /* number of subbands */ |
| 45 | |
| 46 | #define MPA_STEREO 0 |
| 47 | #define MPA_JSTEREO 1 |
| 48 | #define MPA_DUAL 2 |
| 49 | #define MPA_MONO 3 |
| 50 | |
| 51 | #ifndef FRAC_BITS |
| 52 | #define FRAC_BITS 23 /* fractional bits for sb_samples and dct */ |
| 53 | #define WFRAC_BITS 16 /* fractional bits for window */ |
| 54 | #endif |
| 55 | |
| 56 | #define IMDCT_SCALAR 1.759 |
| 57 | |
| 58 | #define FRAC_ONE (1 << FRAC_BITS) |
| 59 | |
| 60 | #define FIX(a) ((int)((a) * FRAC_ONE)) |
| 61 | |
| 62 | #if USE_FLOATS |
| 63 | # define INTFLOAT float |
| 64 | # define SUINTFLOAT float |
| 65 | typedef float MPA_INT; |
| 66 | typedef float OUT_INT; |
| 67 | #elif FRAC_BITS <= 15 |
| 68 | # define INTFLOAT int |
| 69 | # define SUINTFLOAT SUINT |
| 70 | typedef int16_t MPA_INT; |
| 71 | typedef int16_t OUT_INT; |
| 72 | #else |
| 73 | # define INTFLOAT int |
| 74 | # define SUINTFLOAT SUINT |
| 75 | typedef int32_t MPA_INT; |
| 76 | typedef int16_t OUT_INT; |
| 77 | #endif |
| 78 | |
| 79 | int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf); |
| 80 | |
| 81 | #endif /* AVCODEC_MPEGAUDIO_H */ |
| 82 |