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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * common functions for the ATRAC family of decoders |
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| 3 | * |
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| 4 | * Copyright (c) 2009-2013 Maxim Poliakovski |
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| 5 | * Copyright (c) 2009 Benjamin Larsson |
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| 6 | * |
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| 7 | * This file is part of FFmpeg. |
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| 8 | * |
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| 9 | * FFmpeg is free software; you can redistribute it and/or |
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| 10 | * modify it under the terms of the GNU Lesser General Public |
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| 11 | * License as published by the Free Software Foundation; either |
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| 12 | * version 2.1 of the License, or (at your option) any later version. |
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| 13 | * |
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| 14 | * FFmpeg is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * Lesser General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU Lesser General Public |
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| 20 | * License along with FFmpeg; if not, write to the Free Software |
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| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |||
| 24 | /** |
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| 25 | * @file |
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| 26 | * ATRAC common header |
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| 27 | */ |
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| 28 | |||
| 29 | #ifndef AVCODEC_ATRAC_H |
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| 30 | #define AVCODEC_ATRAC_H |
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| 31 | |||
| 32 | /** |
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| 33 | * Gain control parameters for one subband. |
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| 34 | */ |
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| 35 | typedef struct AtracGainInfo { |
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| 36 | int num_points; ///< number of gain control points |
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| 37 | int lev_code[7]; ///< level at corresponding control point |
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| 38 | int loc_code[7]; ///< location of gain control points |
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| 39 | } AtracGainInfo; |
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| 40 | |||
| 41 | /** |
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| 42 | * Gain compensation context structure. |
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| 43 | */ |
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| 44 | typedef struct AtracGCContext { |
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| 45 | float gain_tab1[16]; ///< gain compensation level table |
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| 46 | float gain_tab2[31]; ///< gain compensation interpolation table |
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| 47 | int id2exp_offset; ///< offset for converting level index into level exponent |
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| 48 | int loc_scale; ///< scale of location code = 2^loc_scale samples |
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| 49 | int loc_size; ///< size of location code in samples |
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| 50 | } AtracGCContext; |
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| 51 | |||
| 52 | extern float ff_atrac_sf_table[64]; |
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| 53 | |||
| 54 | /** |
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| 55 | * Generate common tables. |
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| 56 | */ |
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| 57 | void ff_atrac_generate_tables(void); |
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| 58 | |||
| 59 | /** |
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| 60 | * Initialize gain compensation context. |
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| 61 | * |
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| 62 | * @param gctx pointer to gain compensation context to initialize |
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| 63 | * @param id2exp_offset offset for converting level index into level exponent |
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| 64 | * @param loc_scale location size factor |
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| 65 | */ |
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| 66 | void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset, |
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| 67 | int loc_scale); |
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| 68 | |||
| 69 | /** |
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| 70 | * Apply gain compensation and perform the MDCT overlapping part. |
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| 71 | * |
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| 72 | * @param gctx pointer to gain compensation context |
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| 73 | * @param in input buffer |
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| 74 | * @param prev previous buffer to perform overlap against |
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| 75 | * @param gc_now gain control information for current frame |
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| 76 | * @param gc_next gain control information for next frame |
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| 77 | * @param num_samples number of samples to process |
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| 78 | * @param out output data goes here |
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| 79 | */ |
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| 80 | void ff_atrac_gain_compensation(AtracGCContext *gctx, float *in, float *prev, |
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| 81 | AtracGainInfo *gc_now, AtracGainInfo *gc_next, |
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| 82 | int num_samples, float *out); |
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| 83 | |||
| 84 | /** |
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| 85 | * Quadrature mirror synthesis filter. |
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| 86 | * |
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| 87 | * @param inlo lower part of spectrum |
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| 88 | * @param inhi higher part of spectrum |
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| 89 | * @param nIn size of spectrum buffer |
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| 90 | * @param pOut out buffer |
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| 91 | * @param delayBuf delayBuf buffer |
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| 92 | * @param temp temp buffer |
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| 93 | */ |
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| 94 | void ff_atrac_iqmf(float *inlo, float *inhi, unsigned int nIn, float *pOut, |
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| 95 | float *delayBuf, float *temp); |
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| 96 | |||
| 97 | #endif /* AVCODEC_ATRAC_H */ |