mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
79cbac8cd4
Move it to the ATRAC common code, to reuse in the upcoming ATRAC3+ decoder. Signed-off-by: Diego Biurrun <diego@biurrun.de>
97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/*
|
|
* common functions for the ATRAC family of decoders
|
|
*
|
|
* Copyright (c) 2009-2013 Maxim Poliakovski
|
|
* Copyright (c) 2009 Benjamin Larsson
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* ATRAC common header
|
|
*/
|
|
|
|
#ifndef AVCODEC_ATRAC_H
|
|
#define AVCODEC_ATRAC_H
|
|
|
|
/**
|
|
* Gain control parameters for one subband.
|
|
*/
|
|
typedef struct AtracGainInfo {
|
|
int num_points; ///< number of gain control points
|
|
int lev_code[7]; ///< level at corresponding control point
|
|
int loc_code[7]; ///< location of gain control points
|
|
} AtracGainInfo;
|
|
|
|
/**
|
|
* Gain compensation context structure.
|
|
*/
|
|
typedef struct AtracGCContext {
|
|
float gain_tab1[16]; ///< gain compensation level table
|
|
float gain_tab2[31]; ///< gain compensation interpolation table
|
|
int id2exp_offset; ///< offset for converting level index into level exponent
|
|
int loc_scale; ///< scale of location code = 2^loc_scale samples
|
|
int loc_size; ///< size of location code in samples
|
|
} AtracGCContext;
|
|
|
|
extern float ff_atrac_sf_table[64];
|
|
|
|
/**
|
|
* Generate common tables.
|
|
*/
|
|
void ff_atrac_generate_tables(void);
|
|
|
|
/**
|
|
* Initialize gain compensation context.
|
|
*
|
|
* @param gctx pointer to gain compensation context to initialize
|
|
* @param id2exp_offset offset for converting level index into level exponent
|
|
* @param loc_scale location size factor
|
|
*/
|
|
void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset,
|
|
int loc_scale);
|
|
|
|
/**
|
|
* Apply gain compensation and perform the MDCT overlapping part.
|
|
*
|
|
* @param gctx pointer to gain compensation context
|
|
* @param in input buffer
|
|
* @param prev previous buffer to perform overlap against
|
|
* @param gc_now gain control information for current frame
|
|
* @param gc_next gain control information for next frame
|
|
* @param num_samples number of samples to process
|
|
* @param out output data goes here
|
|
*/
|
|
void ff_atrac_gain_compensation(AtracGCContext *gctx, float *in, float *prev,
|
|
AtracGainInfo *gc_now, AtracGainInfo *gc_next,
|
|
int num_samples, float *out);
|
|
|
|
/**
|
|
* Quadrature mirror synthesis filter.
|
|
*
|
|
* @param inlo lower part of spectrum
|
|
* @param inhi higher part of spectrum
|
|
* @param nIn size of spectrum buffer
|
|
* @param pOut out buffer
|
|
* @param delayBuf delayBuf buffer
|
|
* @param temp temp buffer
|
|
*/
|
|
void ff_atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp);
|
|
|
|
#endif /* AVCODEC_ATRAC_H */
|