atrac.h

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/*
 * common functions for the ATRAC family of decoders
 *
 * Copyright (c) 2009-2013 Maxim Poliakovski
 * Copyright (c) 2009 Benjamin Larsson
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_ATRAC_H
#define AVCODEC_ATRAC_H

typedef struct AtracGainInfo {
    int   num_points;   
    int   lev_code[7];  
    int   loc_code[7];  
} AtracGainInfo;

typedef struct AtracGCContext {
    float   gain_tab1[16];  
    float   gain_tab2[31];  
    int     id2exp_offset;  
    int     loc_scale;      
    int     loc_size;       
} AtracGCContext;

extern float ff_atrac_sf_table[64];

void ff_atrac_generate_tables(void);

void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset,
                                     int loc_scale);

void ff_atrac_gain_compensation(AtracGCContext *gctx, float *in, float *prev,
                                AtracGainInfo *gc_now, AtracGainInfo *gc_next,
                                int num_samples, float *out);

void ff_atrac_iqmf(float *inlo, float *inhi, unsigned int nIn, float *pOut,
                   float *delayBuf, float *temp);

#endif /* AVCODEC_ATRAC_H */