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/* replaygain_synthesis - Routines for applying ReplayGain to a signal
* Copyright (C) 2002,2003,2004 Josh Coalson
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H
#define FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H
#include <stdlib.h> /* for size_t */
#include "FLAC/ordinals.h"
#define FLAC_SHARE__MAX_SUPPORTED_CHANNELS 2
typedef enum {
NOISE_SHAPING_NONE = 0,
NOISE_SHAPING_LOW = 1,
NOISE_SHAPING_MEDIUM = 2,
NOISE_SHAPING_HIGH = 3
} NoiseShaping;
typedef struct {
const float* FilterCoeff;
FLAC__uint64 Mask;
double Add;
float Dither;
float ErrorHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16]; /* 16th order Noise shaping */
float DitherHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16];
int LastRandomNumber [FLAC_SHARE__MAX_SUPPORTED_CHANNELS];
unsigned LastHistoryIndex;
NoiseShaping ShapingType;
} DitherContext;
void FLAC__replaygain_synthesis__init_dither_context(DitherContext *dither, int bits, int shapingtype);
/* scale = (float) pow(10., (double)replaygain * 0.05); */
size_t FLAC__replaygain_synthesis__apply_gain(FLAC__byte *data_out, FLAC__bool little_endian_data_out, FLAC__bool unsigned_data_out, const FLAC__int32 * const input[], unsigned wide_samples, unsigned channels, const unsigned source_bps, const unsigned target_bps, const double scale, const FLAC__bool hard_limit, FLAC__bool do_dithering, DitherContext *dither_context);
#endif
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