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1 | /* |
2 | * common functions for the ATRAC family of decoders | |
3 | * | |
4 | * Copyright (c) 2009-2013 Maxim Poliakovski | |
5 | * Copyright (c) 2009 Benjamin Larsson | |
6 | * | |
7 | * This file is part of FFmpeg. | |
8 | * | |
9 | * FFmpeg is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * FFmpeg is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with FFmpeg; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | /** | |
25 | * @file | |
26 | * ATRAC common header | |
27 | */ | |
28 | ||
29 | #ifndef AVCODEC_ATRAC_H | |
30 | #define AVCODEC_ATRAC_H | |
31 | ||
32 | /** | |
33 | * Gain control parameters for one subband. | |
34 | */ | |
35 | typedef struct AtracGainInfo { | |
36 | int num_points; ///< number of gain control points | |
37 | int lev_code[7]; ///< level at corresponding control point | |
38 | int loc_code[7]; ///< location of gain control points | |
39 | } AtracGainInfo; | |
40 | ||
41 | /** | |
42 | * Gain compensation context structure. | |
43 | */ | |
44 | typedef struct AtracGCContext { | |
45 | float gain_tab1[16]; ///< gain compensation level table | |
46 | float gain_tab2[31]; ///< gain compensation interpolation table | |
47 | int id2exp_offset; ///< offset for converting level index into level exponent | |
48 | int loc_scale; ///< scale of location code = 2^loc_scale samples | |
49 | int loc_size; ///< size of location code in samples | |
50 | } AtracGCContext; | |
51 | ||
52 | extern float ff_atrac_sf_table[64]; | |
53 | ||
54 | /** | |
55 | * Generate common tables. | |
56 | */ | |
57 | void ff_atrac_generate_tables(void); | |
58 | ||
59 | /** | |
60 | * Initialize gain compensation context. | |
61 | * | |
62 | * @param gctx pointer to gain compensation context to initialize | |
63 | * @param id2exp_offset offset for converting level index into level exponent | |
64 | * @param loc_scale location size factor | |
65 | */ | |
66 | void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset, | |
67 | int loc_scale); | |
68 | ||
69 | /** | |
70 | * Apply gain compensation and perform the MDCT overlapping part. | |
71 | * | |
72 | * @param gctx pointer to gain compensation context | |
73 | * @param in input buffer | |
74 | * @param prev previous buffer to perform overlap against | |
75 | * @param gc_now gain control information for current frame | |
76 | * @param gc_next gain control information for next frame | |
77 | * @param num_samples number of samples to process | |
78 | * @param out output data goes here | |
79 | */ | |
80 | void ff_atrac_gain_compensation(AtracGCContext *gctx, float *in, float *prev, | |
81 | AtracGainInfo *gc_now, AtracGainInfo *gc_next, | |
82 | int num_samples, float *out); | |
83 | ||
84 | /** | |
85 | * Quadrature mirror synthesis filter. | |
86 | * | |
87 | * @param inlo lower part of spectrum | |
88 | * @param inhi higher part of spectrum | |
89 | * @param nIn size of spectrum buffer | |
90 | * @param pOut out buffer | |
91 | * @param delayBuf delayBuf buffer | |
92 | * @param temp temp buffer | |
93 | */ | |
94 | void ff_atrac_iqmf(float *inlo, float *inhi, unsigned int nIn, float *pOut, | |
95 | float *delayBuf, float *temp); | |
96 | ||
97 | #endif /* AVCODEC_ATRAC_H */ |