replaygain_synthesis.h (2159B)
1 /* replaygain_synthesis - Routines for applying ReplayGain to a signal 2 * Copyright (C) 2002,2003,2004,2005 Josh Coalson 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * This program 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 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 27 typedef enum { 28 NOISE_SHAPING_NONE = 0, 29 NOISE_SHAPING_LOW = 1, 30 NOISE_SHAPING_MEDIUM = 2, 31 NOISE_SHAPING_HIGH = 3 32 } NoiseShaping; 33 34 typedef 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 46 void FLAC__replaygain_synthesis__init_dither_context(DitherContext *dither, int bits, int shapingtype); 47 48 /* scale = (float) pow(10., (double)replaygain * 0.05); */ 49 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); 50 51 #endif