52 lines
2.1 KiB
C
52 lines
2.1 KiB
C
/* replaygain_synthesis - Routines for applying ReplayGain to a signal
|
|
* Copyright (C) 2002,2003,2004,2005,2006,2007 Josh Coalson
|
|
*
|
|
* This library 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.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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
|