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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * copyright (c) 2001 Fabrice Bellard |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | /** |
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| 22 | * @file |
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| 23 | * mpeg audio declarations for both encoder and decoder. |
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| 24 | */ |
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| 25 | |||
| 26 | #ifndef AVCODEC_MPEGAUDIO_H |
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| 27 | #define AVCODEC_MPEGAUDIO_H |
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| 28 | |||
| 29 | #ifndef CONFIG_FLOAT |
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| 30 | # define CONFIG_FLOAT 0 |
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| 31 | #endif |
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| 32 | |||
| 33 | #include |
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| 34 | |||
| 35 | /* max frame size, in samples */ |
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| 36 | #define MPA_FRAME_SIZE 1152 |
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| 37 | |||
| 38 | /* max compressed frame size */ |
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| 39 | #define MPA_MAX_CODED_FRAME_SIZE 1792 |
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| 40 | |||
| 41 | #define MPA_MAX_CHANNELS 2 |
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| 42 | |||
| 43 | #define SBLIMIT 32 /* number of subbands */ |
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| 44 | |||
| 45 | #define MPA_STEREO 0 |
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| 46 | #define MPA_JSTEREO 1 |
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| 47 | #define MPA_DUAL 2 |
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| 48 | #define MPA_MONO 3 |
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| 49 | |||
| 50 | #ifndef FRAC_BITS |
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| 51 | #define FRAC_BITS 23 /* fractional bits for sb_samples and dct */ |
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| 52 | #define WFRAC_BITS 16 /* fractional bits for window */ |
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| 53 | #endif |
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| 54 | |||
| 55 | #define IMDCT_SCALAR 1.759 |
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| 56 | |||
| 57 | #define FRAC_ONE (1 << FRAC_BITS) |
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| 58 | |||
| 59 | #define FIX(a) ((int)((a) * FRAC_ONE)) |
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| 60 | |||
| 61 | #if CONFIG_FLOAT |
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| 62 | # define INTFLOAT float |
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| 63 | typedef float MPA_INT; |
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| 64 | typedef float OUT_INT; |
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| 65 | #elif FRAC_BITS <= 15 |
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| 66 | # define INTFLOAT int |
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| 67 | typedef int16_t MPA_INT; |
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| 68 | typedef int16_t OUT_INT; |
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| 69 | #else |
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| 70 | # define INTFLOAT int |
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| 71 | typedef int32_t MPA_INT; |
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| 72 | typedef int16_t OUT_INT; |
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| 73 | #endif |
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| 74 | |||
| 75 | int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf); |
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| 76 | |||
| 77 | #endif /* AVCODEC_MPEGAUDIO_H */ |