Libav
atrac.h
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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 Libav.
8  *
9  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
29 #ifndef AVCODEC_ATRAC_H
30 #define AVCODEC_ATRAC_H
31 
35 typedef struct AtracGainInfo {
36  int num_points;
37  int lev_code[7];
38  int loc_code[7];
40 
44 typedef struct AtracGCContext {
45  float gain_tab1[16];
46  float gain_tab2[31];
48  int loc_scale;
49  int loc_size;
51 
52 extern float ff_atrac_sf_table[64];
53 
57 void ff_atrac_generate_tables(void);
58 
66 void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset,
67  int loc_scale);
68 
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 
94 void ff_atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp);
95 
96 #endif /* AVCODEC_ATRAC_H */