1 /* replaygain_synthesis - Routines for applying ReplayGain to a signal 2 * Copyright (C) 2002-2009 Josh Coalson 3 * Copyright (C) 2011-2016 Xiph.Org Foundation 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Lesser General Public 7 * License as published by the Free Software Foundation; either 8 * version 2.1 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Lesser General Public License for more details. 14 * 15 * You should have received a copy of the GNU Lesser General Public 16 * License along with this library; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 #ifndef FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H 21 #define FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H 22 23 #include <stdlib.h> /* for size_t */ 24 #include "FLAC/format.h" 25 26 #define FLAC_SHARE__MAX_SUPPORTED_CHANNELS FLAC__MAX_CHANNELS 27 28 typedef enum { 29 NOISE_SHAPING_NONE = 0, 30 NOISE_SHAPING_LOW = 1, 31 NOISE_SHAPING_MEDIUM = 2, 32 NOISE_SHAPING_HIGH = 3 33 } NoiseShaping; 34 35 typedef struct { 36 const float* FilterCoeff; 37 FLAC__uint64 Mask; 38 double Add; 39 float Dither; 40 float ErrorHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16]; /* 16th order Noise shaping */ 41 float DitherHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16]; 42 int LastRandomNumber [FLAC_SHARE__MAX_SUPPORTED_CHANNELS]; 43 unsigned LastHistoryIndex; 44 NoiseShaping ShapingType; 45 } DitherContext; 46 47 void FLAC__replaygain_synthesis__init_dither_context(DitherContext *dither, int bits, int shapingtype); 48 49 /* scale = (float) pow(10., (double)replaygain * 0.05); */ 50 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[], uint32_t wide_samples, uint32_t channels, const uint32_t source_bps, const uint32_t target_bps, const double scale, const FLAC__bool hard_limit, FLAC__bool do_dithering, DitherContext *dither_context); 51 52 #endif 53