1*600f14f4SXin Li /* replaygain_synthesis - Routines for applying ReplayGain to a signal 2*600f14f4SXin Li * Copyright (C) 2002-2009 Josh Coalson 3*600f14f4SXin Li * Copyright (C) 2011-2023 Xiph.Org Foundation 4*600f14f4SXin Li * 5*600f14f4SXin Li * This library is free software; you can redistribute it and/or 6*600f14f4SXin Li * modify it under the terms of the GNU Lesser General Public 7*600f14f4SXin Li * License as published by the Free Software Foundation; either 8*600f14f4SXin Li * version 2.1 of the License, or (at your option) any later version. 9*600f14f4SXin Li * 10*600f14f4SXin Li * This library is distributed in the hope that it will be useful, 11*600f14f4SXin Li * but WITHOUT ANY WARRANTY; without even the implied warranty of 12*600f14f4SXin Li * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13*600f14f4SXin Li * Lesser General Public License for more details. 14*600f14f4SXin Li * 15*600f14f4SXin Li * You should have received a copy of the GNU Lesser General Public 16*600f14f4SXin Li * License along with this library; if not, write to the Free Software 17*600f14f4SXin Li * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18*600f14f4SXin Li */ 19*600f14f4SXin Li 20*600f14f4SXin Li #ifndef FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H 21*600f14f4SXin Li #define FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H 22*600f14f4SXin Li 23*600f14f4SXin Li #include <stdlib.h> /* for size_t */ 24*600f14f4SXin Li #include "FLAC/format.h" 25*600f14f4SXin Li 26*600f14f4SXin Li #define FLAC_SHARE__MAX_SUPPORTED_CHANNELS FLAC__MAX_CHANNELS 27*600f14f4SXin Li 28*600f14f4SXin Li typedef enum { 29*600f14f4SXin Li NOISE_SHAPING_NONE = 0, 30*600f14f4SXin Li NOISE_SHAPING_LOW = 1, 31*600f14f4SXin Li NOISE_SHAPING_MEDIUM = 2, 32*600f14f4SXin Li NOISE_SHAPING_HIGH = 3 33*600f14f4SXin Li } NoiseShaping; 34*600f14f4SXin Li 35*600f14f4SXin Li typedef struct { 36*600f14f4SXin Li const float* FilterCoeff; 37*600f14f4SXin Li FLAC__uint64 Mask; 38*600f14f4SXin Li double Add; 39*600f14f4SXin Li float Dither; 40*600f14f4SXin Li float ErrorHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16]; /* 16th order Noise shaping */ 41*600f14f4SXin Li float DitherHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16]; 42*600f14f4SXin Li int LastRandomNumber [FLAC_SHARE__MAX_SUPPORTED_CHANNELS]; 43*600f14f4SXin Li unsigned LastHistoryIndex; 44*600f14f4SXin Li NoiseShaping ShapingType; 45*600f14f4SXin Li } DitherContext; 46*600f14f4SXin Li 47*600f14f4SXin Li void FLAC__replaygain_synthesis__init_dither_context(DitherContext *dither, int bits, int shapingtype); 48*600f14f4SXin Li 49*600f14f4SXin Li /* scale = (float) pow(10., (double)replaygain * 0.05); */ 50*600f14f4SXin Li 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*600f14f4SXin Li 52*600f14f4SXin Li #endif 53