98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
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/*
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* common functions for the ATRAC family of decoders
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*
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* Copyright (c) 2009-2013 Maxim Poliakovski
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* Copyright (c) 2009 Benjamin Larsson
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* ATRAC common header
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*/
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#ifndef AVCODEC_ATRAC_H
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#define AVCODEC_ATRAC_H
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/**
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* Gain control parameters for one subband.
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*/
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typedef struct AtracGainInfo {
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int num_points; ///< number of gain control points
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int lev_code[7]; ///< level at corresponding control point
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int loc_code[7]; ///< location of gain control points
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} AtracGainInfo;
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/**
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* Gain compensation context structure.
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*/
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typedef struct AtracGCContext {
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float gain_tab1[16]; ///< gain compensation level table
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float gain_tab2[31]; ///< gain compensation interpolation table
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int id2exp_offset; ///< offset for converting level index into level exponent
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int loc_scale; ///< scale of location code = 2^loc_scale samples
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int loc_size; ///< size of location code in samples
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} AtracGCContext;
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extern float ff_atrac_sf_table[64];
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/**
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* Generate common tables.
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*/
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void ff_atrac_generate_tables(void);
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/**
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* Initialize gain compensation context.
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*
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* @param gctx pointer to gain compensation context to initialize
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* @param id2exp_offset offset for converting level index into level exponent
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* @param loc_scale location size factor
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*/
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void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset,
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int loc_scale);
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/**
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* Apply gain compensation and perform the MDCT overlapping part.
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*
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* @param gctx pointer to gain compensation context
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* @param in input buffer
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* @param prev previous buffer to perform overlap against
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* @param gc_now gain control information for current frame
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* @param gc_next gain control information for next frame
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* @param num_samples number of samples to process
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* @param out output data goes here
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*/
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void ff_atrac_gain_compensation(AtracGCContext *gctx, float *in, float *prev,
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AtracGainInfo *gc_now, AtracGainInfo *gc_next,
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int num_samples, float *out);
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/**
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* Quadrature mirror synthesis filter.
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*
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* @param inlo lower part of spectrum
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* @param inhi higher part of spectrum
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* @param nIn size of spectrum buffer
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* @param pOut out buffer
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* @param delayBuf delayBuf buffer
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* @param temp temp buffer
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*/
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void ff_atrac_iqmf(float *inlo, float *inhi, unsigned int nIn, float *pOut,
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float *delayBuf, float *temp);
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#endif /* AVCODEC_ATRAC_H */
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