cannam@86: /* replaygain_synthesis - Routines for applying ReplayGain to a signal
cannam@86:  * Copyright (C) 2002,2003,2004,2005,2006,2007  Josh Coalson
cannam@86:  *
cannam@86:  * This library is free software; you can redistribute it and/or
cannam@86:  * modify it under the terms of the GNU Lesser General Public
cannam@86:  * License as published by the Free Software Foundation; either
cannam@86:  * version 2.1 of the License, or (at your option) any later version.
cannam@86:  *
cannam@86:  * This library is distributed in the hope that it will be useful,
cannam@86:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@86:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
cannam@86:  * Lesser General Public License for more details.
cannam@86:  *
cannam@86:  * You should have received a copy of the GNU Lesser General Public
cannam@86:  * License along with this library; if not, write to the Free Software
cannam@86:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
cannam@86:  */
cannam@86: 
cannam@86: #ifndef FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H
cannam@86: #define FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H
cannam@86: 
cannam@86: #include <stdlib.h> /* for size_t */
cannam@86: #include "FLAC/ordinals.h"
cannam@86: 
cannam@86: #define FLAC_SHARE__MAX_SUPPORTED_CHANNELS 2
cannam@86: 
cannam@86: typedef enum {
cannam@86: 	NOISE_SHAPING_NONE = 0,
cannam@86: 	NOISE_SHAPING_LOW = 1,
cannam@86: 	NOISE_SHAPING_MEDIUM = 2,
cannam@86: 	NOISE_SHAPING_HIGH = 3
cannam@86: } NoiseShaping;
cannam@86: 
cannam@86: typedef struct {
cannam@86: 	const float*  FilterCoeff;
cannam@86: 	FLAC__uint64  Mask;
cannam@86: 	double        Add;
cannam@86: 	float         Dither;
cannam@86: 	float         ErrorHistory     [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16];  /* 16th order Noise shaping */
cannam@86: 	float         DitherHistory    [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16];
cannam@86: 	int           LastRandomNumber [FLAC_SHARE__MAX_SUPPORTED_CHANNELS];
cannam@86: 	unsigned      LastHistoryIndex;
cannam@86: 	NoiseShaping  ShapingType;
cannam@86: } DitherContext;
cannam@86: 
cannam@86: void FLAC__replaygain_synthesis__init_dither_context(DitherContext *dither, int bits, int shapingtype);
cannam@86: 
cannam@86: /* scale = (float) pow(10., (double)replaygain * 0.05); */
cannam@86: 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);
cannam@86: 
cannam@86: #endif