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97 lines
3.3 KiB
97 lines
3.3 KiB
/* |
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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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