1/* replaygain_synthesis - Routines for applying ReplayGain to a signal 2 * Copyright (C) 2002,2003,2004,2005,2006,2007 Josh Coalson 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with this library; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19#ifndef FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H 20#define FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H 21 22#include <stdlib.h> /* for size_t */ 23#include "FLAC/ordinals.h" 24 25#define FLAC_SHARE__MAX_SUPPORTED_CHANNELS 2 26 27typedef enum { 28 NOISE_SHAPING_NONE = 0, 29 NOISE_SHAPING_LOW = 1, 30 NOISE_SHAPING_MEDIUM = 2, 31 NOISE_SHAPING_HIGH = 3 32} NoiseShaping; 33 34typedef struct { 35 const float* FilterCoeff; 36 FLAC__uint64 Mask; 37 double Add; 38 float Dither; 39 float ErrorHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16]; /* 16th order Noise shaping */ 40 float DitherHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16]; 41 int LastRandomNumber [FLAC_SHARE__MAX_SUPPORTED_CHANNELS]; 42 unsigned LastHistoryIndex; 43 NoiseShaping ShapingType; 44} DitherContext; 45 46void FLAC__replaygain_synthesis__init_dither_context(DitherContext *dither, int bits, int shapingtype); 47 48/* scale = (float) pow(10., (double)replaygain * 0.05); */ 49size_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); 50 51#endif 52